AISI 4047 Steel Flange

1,We Manufacturing processes are primarily classified into four types: 1:Forging, 2:Casting, 3:Cutting, 4:Rolling. 2,We can manufacture in accordance with these standards. Standards: GB Series (Chinese Standards), JB Series (Machinery Standards), HG Series (Chemical Industry Standards), ASME B16.5 (American Standards), BS4504 (British Standards), DIN (German Standards), and JIS (Japanese Standards). Internationally, there are two primary systems of pipe flange standards: the European system, represented by the German DIN standards (including those of the former Soviet Union), and the American system, represented by the US ANSI pipe flange standards. Other common standards include: the Chinese Ministry of Machinery Industry standards (JB series), the Ministry of Chemical Industry standards (HG series), the Chinese National Standard *GB/T 9112–9124-2010 Steel Pipe Flanges*, as well as US standards (ASME B16.5), British standards (BS4504), German standards (DIN), Japanese standards (JIS), and marine standards (CBM), among others. The nominal pressure ratings for the PN series are designated by "PN" and comprise the following nine levels: PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, and PN160. The nominal pressure ratings for the Class series are designated by "Class" and comprise the following six levels: Class150, Class300, Class600, Class900, Class1500, and Class2500. Flange Classification 1. **According to Chemical Industry Standards:** Flanges are classified as follows: Plate Flat Welding Flange (PL), Necked Flat Welding Flange (SO), Necked Butt Welding Flange (WN), Integral Flange (IF), Socket Welding Flange (SW), Threaded Flange (Th), Butt Welding Ring Loose Flange (PJ/SE), Blind Flange (BL), Flat Welding Ring Loose Flange (PJ/PJ), and Lined Blind Flange (BL(s)). 2. **According to Petrochemical (SH) Industry Standards:** Flanges are classified as follows: Threaded Flange (PL), Butt Welding Flange (WN), Flat Welding Flange (SO), Socket Welding Flange (SW), Loose Flange (LJ), and Blind Flange (no specific designation). 3. **According to Machinery (JB) Industry Standards:** Flanges are classified as follows: Integral Flange, Butt Welding Flange, Plate Flat Welding Flange, Butt Welding Ring Plate Loose Flange, Flat Welding Ring Plate Loose Flange, Lap Joint Ring Plate Loose Flange, and Blind Flange. 4. **According to Connection Method/Type:** Flanges are classified as follows: Plate Flat Welding Flange, Necked Flat Welding Flange, Necked Butt Welding Flange, Socket Welding Flange, Threaded Flange, Blind Flange, Necked Butt Welding Ring Loose Flange, Flat Welding Ring Loose Flange, Ring-Type Joint (RTJ) Flange and Blind Flange, Large-Diameter Plate Flange, Large-Diameter High-Neck Flange, Figure-8 Blind Plate, Butt Welding Ring Loose Flange, etc. 5. **According to the Component Being Connected:** Flanges can be classified into Vessel Flanges and Pipe Flanges. 6. **According to Structural Type:** Flanges include Integral Flanges, Threaded Flanges, Flat Welding Flanges, Butt Welding Flanges, Lap Joint (Loose/Swivel) Flanges, and Blind Flanges. A flange—also referred to as a flange plate or rim—is a component used to connect shafts to one another, or, more commonly, to join the ends of pipes. Flanges are also utilized at the inlet and outlet ports of equipment to facilitate connections between two devices—for instance, the flange on a speed reducer. A "flange connection" or "flanged joint" refers to a detachable joint assembly comprising three interconnected elements—a flange, a gasket, and bolts—that together form a sealed structural unit. In the context of piping systems, a "pipe flange" specifically denotes a flange used for plumbing within the installation; when applied to equipment, it refers to the inlet or outlet flange of that specific device. Flanges feature a series of holes through which bolts are inserted to securely fasten the two flanges together, while a gasket placed between the flanges ensures a leak-proof seal. Flanges are broadly categorized into three types: threaded (screw-in) flanges, welded flanges, and clamp-type flanges. Flanges are invariably used in pairs; threaded flanges are suitable for low-pressure piping applications, whereas welded flanges are required for systems operating at pressures exceeding 4 kilograms per square centimeter. A sealing gasket is inserted between the two flange plates, which are then firmly secured using bolts. The thickness of a flange—as well as the specifications of the bolts used to fasten it—vary depending on the specific pressure rating required for the application. When connecting equipment such as water pumps or valves to piping systems, the corresponding connection points on these devices are often manufactured in the shape of a matching flange; this method of attachment is also referred to as a "flange connection." Generally, any connecting component that utilizes bolts to join and seal the perimeters of two flat surfaces—such as the joints in ventilation ducts—is termed a "flange"; such components may collectively be classified as "flange-type parts." However, since such a connection often constitutes merely a *portion* of a larger device—for instance, the interface between a flange and a water pump—it would be inappropriate to classify the entire water pump itself as a "flange-type part." Conversely, smaller components—such as valves—that feature such flanged interfaces may indeed be appropriately categorized as "flange-type parts." -:- For detailed product information, please contact sales. -: AISI 4047 Steel Flange Product Information -:- For detailed product information, please contact sales. -: AISI 4047 Steel Flange Synonyms -:- For detailed product information, please contact sales. -:

AISI 4047 Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: AISI 4047 Steel** ## **Executive Summary** **AISI 4047** is a **high-carbon molybdenum alloy steel** engineered for applications demanding exceptional hardness, wear resistance, and spring properties. With a carbon content of approximately 0.45-0.50% combined with 0.20-0.30% molybdenum, this grade represents the highest carbon variant in the AISI 40xx molybdenum steel series. AISI 4047 offers superior hardenability, excellent response to heat treatment, and outstanding wear characteristics when properly processed. It is particularly valued for manufacturing springs, high-strength fasteners, cutting tools, and wear components where maximum hardness retention, fatigue resistance, and durability are critical requirements in demanding industrial applications. --- ## **1. Chemical Composition** ### **Standard Composition Ranges** | Element | Content Range (% by weight) - **AISI 4047** | Primary Function | | :--- | :--- | :--- | | **Carbon (C)** | 0.45 - 0.50 | **Primary strengthener:** Provides maximum hardness potential through martensite formation; enables high elastic limit and wear resistance | | **Molybdenum (Mo)** | 0.20 - 0.30 | **Key alloying element:** Enhances hardenability depth, improves temper resistance, refines grain structure, reduces susceptibility to temper embrittlement | | **Manganese (Mn)** | 0.70 - 0.90 | Deoxidizer, improves hardenability, enhances response to heat treatment | | **Silicon (Si)** | 0.15 - 0.35 | Deoxidizer, solid solution strengthener in ferrite, improves hardenability and elastic properties | | **Phosphorus (P)** | 0.035 max | Impurity (strictly controlled for optimal ductility and toughness) | | **Sulfur (S)** | 0.040 max | Impurity (typically kept low; may be controlled to 0.08-0.15% in free-machining variants) | | **Nickel (Ni)** | - | Not specified; trace amounts may be present | | **Chromium (Cr)** | - | Not specified; trace amounts may be present | | **Iron (Fe)** | Balance | Matrix element | ### **Key Metallurgical Features** - **Maximum Hardness Potential:** 0.45-0.50% carbon enables hardness up to 60-62 HRC when properly heat treated - **Superior Hardenability:** Molybdenum addition provides excellent through-hardening capability for a high-carbon steel - **Exceptional Wear Resistance:** High carbon content combined with proper heat treatment yields outstanding abrasion resistance - **Good Spring Properties:** Combination of high carbon and molybdenum provides excellent elastic limit and fatigue resistance - **Temper Resistance:** Molybdenum significantly improves resistance to softening during tempering and elevated temperature service --- ## **2. Physical & Mechanical Properties** ### **A. Fundamental Physical Properties** | Property | Condition | Value/Range | Notes | | :--- | :--- | :--- | :--- | | **Density** | All conditions | 7.85 g/cm³ (0.284 lb/in³) | - | | **Melting Point** | - | ~1500°C (2730°F) | Slightly reduced due to alloying | | **Elastic Modulus** | Tempered | 200-205 GPa (29,000-29,700 ksi) | - | | **Shear Modulus** | - | 80-82 GPa (11,600-11,900 ksi) | - | | **Poisson's Ratio** | - | 0.29 | - | | **Thermal Conductivity** | 100°C | 42.0 W/m·K | Reduced compared to lower-carbon steels | | **Specific Heat Capacity** | 20°C | 470 J/kg·K | - | | **Thermal Expansion Coefficient** | 20-100°C | 11.6 × 10⁻⁶/°C | - | | **Electrical Resistivity** | 20°C | 0.25 μΩ·m | Increased due to alloying elements | | **Magnetic Properties** | Below Curie temp | Ferromagnetic | - | ### **B. Mechanical Properties by Heat Treatment Condition** #### **1. Annealed Condition (Machining State)** - **Hardness:** 197-241 HB (Brinell) - **Tensile Strength:** 655-830 MPa (95-120 ksi) - **Yield Strength (0.2% offset):** 485-690 MPa (70-100 ksi) - **Elongation:** 16-21% in 50mm - **Reduction of Area:** 40-50% - **Charpy V-Notch Impact:** 40-65 J (30-48 ft-lb) at room temperature - **Machinability Rating:** 45-50% of B1112 (Fair to Poor, requires proper techniques) #### **2. Normalized Condition (For Improved Consistency)** - **Hardness:** 229-285 HB - **Tensile Strength:** 760-970 MPa (110-140 ksi) - **Yield Strength:** 620-830 MPa (90-120 ksi) - **Elongation:** 14-19% #### **3. As-Quenched Condition** - **Hardness:** 60-62 HRC (oil quenched from 800-815°C) - **Condition:** Extremely brittle, requires immediate tempering - **Microstructure:** Primarily martensite with possible retained austenite - **Applications:** Rarely used as-quenched except for maximum wear resistance with subsequent tempering #### **4. Quenched & Tempered Properties** *Standard heat treatment: Austenitize 800-815°C, oil quench, temper as specified* | Tempering Temperature | Tensile Strength | Yield Strength | Elongation | Hardness | Impact Energy (Charpy V) | | :--- | :--- | :--- | :--- | :--- | :--- | | **150°C (300°F)** | 1,900-2,100 MPa | 1,650-1,850 MPa | 4-8% | 56-60 HRC | 10-20 J | | **315°C (600°F)** | 1,650-1,800 MPa | 1,450-1,600 MPa | 8-12% | 50-54 HRC | 20-35 J | | **425°C (800°F)** | 1,450-1,600 MPa | 1,300-1,450 MPa | 10-14% | 44-48 HRC | 30-50 J | | **540°C (1000°F)** | 1,200-1,350 MPa | 1,100-1,250 MPa | 12-16% | 38-42 HRC | 40-65 J | #### **5. Spring Temper Properties** *Special tempering for spring applications* - **Tempering Range:** 400-480°C (750-900°F) - **Resulting Hardness:** 45-50 HRC - **Tensile Strength:** 1,500-1,700 MPa - **Yield Strength:** 1,350-1,550 MPa - **Elastic Limit:** ~1,200-1,400 MPa - **Fatigue Strength:** 600-700 MPa (rotating bending, 10⁷ cycles) ### **C. Special Properties** - **Maximum Hardness:** 60-62 HRC achievable (among highest for non-tool steels) - **Hardenability:** Excellent; suitable for through-hardening sections up to 70-85mm (2.8-3.3") in oil - **Wear Resistance:** Superior abrasion and adhesive wear resistance when properly heat treated - **Fatigue Strength:** Excellent bending and torsional fatigue performance at appropriate hardness levels - **Spring Properties:** High elastic limit and good fatigue resistance for spring applications - **Temper Resistance:** Excellent resistance to softening up to 400°C (750°F) - **Machinability:** Fair in annealed condition; requires carbide tools and proper techniques --- ## **3. International Standards & Specifications** ### **Primary Governing Standards** | Standard/Organization | Designation | Title/Scope | | :--- | :--- | :--- | | **AISI/SAE** | 4047 | Standard grade designation | | **UNS** | G40470 | Unified Numbering System | | **ASTM** | A29/A29M | Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought | | **ASTM** | A322 | Standard Specification for Steel Bars, Alloy, Standard Grades | | **SAE** | J404, J412 | Chemical compositions and hardenability | | **AMS** | 6325 | Aircraft quality bars and forgings (when specified) | ### **International Equivalents & Cross-References** | Country/Region | Equivalent Designation | Standard | Notes | | :--- | :--- | :--- | :--- | | **ISO** | **47MnMo6** | ISO 683-11 | Similar high-carbon molybdenum steel | | **European** | **47MnMo6** | EN 10083-3 | Through-hardening steel, similar properties | | **Germany** | **47MnMo6** | DIN 17210 | Direct equivalent | | **United Kingdom** | **En 111B** | BS 970 | Similar high-carbon alloy steel | | **Japan** | **- (See Note)** | JIS G4102 | No common direct equivalent | | **China** | **47Mo** | GB/T 3077 | Similar molybdenum steel concept | | **India** | **47Mo40** | IS 5517 | Similar high-carbon Mo steel | | **Hardenability Variant** | **4047H** | SAE J1268 | Available with guaranteed hardenability bands | **Note:** AISI 4047 is primarily a North American grade. The German DIN 17210 standard includes 47MnMo6 as a close equivalent with similar composition and applications. --- ## **4. Product Applications & Industries** ### **Available Product Forms** - **Bar Stock:** Hot-rolled rounds (10-150mm), squares, hexagons, flats - **Wire Rod:** For cold heading and spring manufacturing - **Forgings:** Open-die and closed-die forgings for heavy components - **Cold-Finished Bars:** Turned, ground, polished for precision applications - **Flat Wire:** For spring and stamping applications - **Billets:** For further processing into specialized components ### **Primary Industry Applications** #### **1. Spring Manufacturing** - **Heavy-Duty Springs:** Coil springs, leaf springs for automotive and industrial applications - **Torsion Bars:** Automotive suspension torsion bars - **Spring Washers:** Bellville washers, wave washers requiring high elastic limit - **Valve Springs:** High-performance engine valve springs - **Advantage:** High elastic limit, good fatigue resistance, temper resistance #### **2. Cutting & Wear Tools** - **Knives and Blades:** Industrial knives, cutting blades, shear blades - **Wear Parts:** Liners, chutes, hopper components subject to abrasion - **Cutting Edges:** Agricultural cutting edges, grader blades - **Tool Bodies:** Tool holders, arbors requiring wear resistance - **Advantage:** Exceptional hardness and wear resistance when properly heat treated #### **3. Automotive & Transportation (Heavy-Duty)** - **Suspension Components:** Heavy-duty spring components for trucks and commercial vehicles - **Fasteners:** Ultra-high-strength bolts, studs (beyond Grade 12.9) - **Wear Components:** Bushings, pins, sleeves in high-wear applications - **Advantage:** Strength, wear resistance, and fatigue performance #### **4. Heavy Equipment & Machinery** - **Construction Equipment:** Excavator teeth, bucket tips, cutting edges - **Agricultural Equipment:** Plow shares, cultivator teeth, harrow blades - **Mining Equipment:** Crusher parts, grinding components, wear plates - **Material Handling:** Conveyor components subject to abrasion - **Advantage:** Exceptional wear resistance in demanding environments #### **5. Industrial Manufacturing** - **Machine Tool Components:** Lathe centers, milling machine arbors requiring hardness - **Gears and Shafts:** Heavily loaded components requiring wear resistance - **Bearing Components:** Heavy-duty bearing races, rollers - **Hydraulic Components:** High-pressure cylinder rods, piston rods - **Advantage:** Combination of strength, hardness, and wear characteristics #### **6. Fastener Industry** - **Ultra-High-Strength Fasteners:** Beyond Grade 12.9 strength levels - **Special Fasteners:** For critical structural connections - **Cold-Headed Parts:** Components requiring subsequent heat treatment - **Advantage:** High strength potential with proper heat treatment --- ## **5. Heat Treatment Technology** ### **Special Considerations for High Carbon Content** AISI 4047 requires careful heat treatment due to its high carbon content (0.45-0.50%): 1. **Lower Austenitizing Temperatures:** Required to prevent excessive grain growth and retained austenite 2. **Controlled Quenching:** Essential to minimize distortion and cracking risks 3. **Immediate Tempering:** Critical to relieve quenching stresses and prevent cracking 4. **Atmosphere Protection:** Important to prevent decarburization and scaling ### **Standard Thermal Processing** #### **1. Annealing (Full Annealing)** - **Temperature:** 830-850°C (1525-1560°F) - **Time:** 1-2 hours per inch of thickness - **Cooling:** Furnace cool to 550°C (1020°F) at ≤15-20°C/hour, then air cool - **Purpose:** Complete softening for machining, spheroidization of carbides #### **2. Spheroidize Annealing (Optimal for Machining)** - **Temperature:** 740-760°C (1365-1400°F) - **Time:** 4-8 hours, then slow furnace cool - **Result:** Spheroidized carbides for best machinability - **Hardness:** 179-229 HB #### **3. Normalizing** - **Temperature:** 870-900°C (1600-1650°F) - **Time:** 30-45 minutes per inch - **Cooling:** Still air - **Purpose:** Homogenization, grain refinement (use with caution due to high carbon) #### **4. Hardening (Quenching)** - **Austenitizing:** **795-810°C (1465-1490°F)** - **Critical: Lower than lower-carbon steels** - **Soak Time:** 20-30 minutes per inch (minimum 30 minutes) - **Quench Medium:** **Fast oil** (Houghton G, Park AAA, or equivalent) - **Agitation:** Vigorous to ensure uniform cooling and minimize cracking risk - **Quench Temperature:** 40-60°C (100-140°F) for oil - **Critical Step:** Transfer to quench bath within **3-5 seconds** maximum #### **5. Tempering (MANDATORY after quenching)** - **Immediate Tempering:** **Within 1 hour** of quenching (preferably immediately) - **Temperature Range:** 150-540°C (300-1000°F) based on requirements - **Time:** 1-2 hours per inch, **minimum 2 hours** regardless of size - **Double Tempering:** **Highly recommended** (temper, cool to room temperature, retemper) - **Cooling:** Air cool after tempering (avoid water quenching) ### **Alternative Heat Treatment Strategies** #### **Martempering/Marquenching** - **Process:** Quench into hot oil or salt (150-200°C), hold until temperature equalizes, then air cool - **Benefits:** Reduced distortion, lower residual stresses, minimized cracking risk - **Applications:** Complex shapes, components with section size variations #### **Austempering** - **Temperature:** 260-370°C (500-700°F) salt bath - **Result:** Bainitic structure with good strength and toughness combination - **Benefits:** Excellent combination of properties, minimal distortion - **Limitations:** Requires specific equipment, limited to certain section sizes #### **Selective Heat Treatment** - **Induction Hardening:** For localized hardening of specific areas - **Flame Hardening:** For large or irregularly shaped components - **Applications:** Cutting edges, wear surfaces requiring localized hardness ### **Spring Heat Treatment Specifics** For spring applications, a specialized process is often used: 1. **Austenitize:** 800-815°C (1470-1500°F) 2. **Oil Quench:** Fast oil with good agitation 3. **Temper:** 400-480°C (750-900°F) for 1-2 hours 4. **Stress Relief:** Additional low-temperature temper if required 5. **Shot Peening:** Often applied to improve fatigue resistance ### **Special Processing Considerations** - **Decarburization Control:** Use protective atmospheres during all high-temperature operations - **Quench Cracking Risk:** High due to carbon content; proper technique essential - **Retained Austenite:** Possible at low tempering temperatures; may require sub-zero treatment - **Dimensional Stability:** Critical for precision components; consider stress relief cycles --- ## **6. Manufacturing & Fabrication Characteristics** ### **Machinability Assessment** - **Annealed Condition:** 45-50% of B1112 free-machinability steel - **Spheroidize Annealed:** 50-55% of B1112 (improved with proper annealing) - **Hardened Condition:** 10-20% of B1112 (requires grinding or hard machining) - **Recommended Practices (Annealed Condition):** - **Turning:** 40-65 m/min (130-215 SFM) with carbide, 15-25 m/min (50-80 SFM) with HSS - **Drilling:** 12-20 m/min (40-65 SFM) with HSS drills, use peck drilling - **Milling:** 50-75 m/min (165-245 SFM) with carbide cutters - **Threading/Tapping:** Use sharp tools, slow speeds, ample lubrication - **Grinding:** Essential for hardened material; use proper technique to avoid burning ### **Weldability Characteristics** **Rating: VERY POOR (generally not recommended)** #### **Welding Considerations** 1. **High Risk:** Extreme susceptibility to cracking due to high carbon content 2. **Preheat Requirement:** 350-450°C (660-840°F) minimum if welding unavoidable 3. **Post-Weld Heat Treatment:** **Mandatory** immediate stress relief and full re-heat treatment 4. **Filler Metals:** Austenitic stainless steel (309L, 310) or nickel-based alloys only 5. **Alternative Joining:** Mechanical fastening, brazing, or adhesive bonding preferred 6. **Critical Note:** Welding should be avoided whenever possible ### **Formability & Hot Working** - **Hot Working Temperature:** 1150-900°C (2100-1650°F) - **Forging:** Good forgeability with **strict temperature control** - **Finishing Temperature:** ≥850°C (1560°F) to avoid cracking - **Cooling After Hot Work:** **Slow cooling essential** (furnace cool or buried in insulating medium) - **Cold Formability:** **Very limited** even in annealed condition; simple bends only - **Hot Forming:** Required for any significant forming operations ### **Grinding & Finishing** - **Grindability:** Good with proper technique, but risk of grinding burns - **Surface Treatments:** Suitable for plating, painting, or other coatings after proper preparation - **Polishing:** Can be polished to high finish if required - **Shot Peening:** Highly beneficial for improving fatigue resistance, especially for springs ### **Special Fabrication Notes** 1. **Machining Before Hardening:** Essential for most components 2. **Stress Relief:** Recommended after heavy machining operations 3. **Dimensional Allowances:** Must account for transformation during heat treatment 4. **Surface Protection:** Important during all processing stages to prevent decarburization --- ## **7. Quality Assurance & Testing** ### **Standard Certification Requirements** 1. **Chemical Analysis:** Complete analysis with emphasis on carbon and molybdenum control 2. **Mechanical Testing:** Tensile, hardness, impact (when specified) 3. **Microstructural Examination:** Grain size (ASTM 5-8 preferred), carbide distribution, inclusion rating 4. **Non-Destructive Testing:** UT, MT, PT as required by specification 5. **Decarburization Check:** Critical for surfaces subject to final grinding or service 6. **Dimensional Inspection:** Per applicable tolerances ### **Specialized Testing for Critical Applications** - **Hardenability Testing:** Jominy end-quench for 4047H variant - **Fracture Toughness Testing:** For fracture-critical components - **Fatigue Testing:** High-cycle, low-cycle, and contact fatigue testing - **Spring Testing:** Elastic limit, relaxation, and fatigue testing for spring applications - **Wear Testing:** Abrasion and adhesive wear testing for wear applications - **Retained Austenite Measurement:** X-ray diffraction for precision components ### **Common Defects & Prevention** 1. **Quench Cracking:** Minimize by proper quenching technique, immediate tempering 2. **Grinding Burns:** Prevent with proper grinding technique, adequate coolant, proper wheel selection 3. **Decarburization:** Use protective atmospheres during all heat treatment operations 4. **Excessive Grain Growth:** Control austenitizing temperature and time 5. **Retained Austenite:** Control through proper austenitizing and consider sub-zero treatment 6. **Temper Embrittlement:** Avoid slow cooling through 375-575°C range after tempering --- ## **8. Design & Engineering Guidelines** ### **Advantages of AISI 4047** 1. **Maximum Hardness Potential:** Among highest for non-tool steel applications 2. **Exceptional Wear Resistance:** Superior abrasion and adhesive wear characteristics 3. **High Elastic Limit:** Excellent for spring and elastic applications 4. **Good Fatigue Resistance:** Performs well under cyclic loading at appropriate hardness levels 5. **Temper Resistance:** Maintains properties at elevated temperatures 6. **Through-Hardening Capability:** Excellent for larger sections requiring uniform properties ### **Design Considerations** 1. **Section Size Limitations:** Consider hardenability capabilities and cracking risks 2. **Stress Concentrations:** Avoid sharp corners, use generous fillet radii, especially at high hardness 3. **Surface Finish Requirements:** Critical for fatigue performance; specify appropriate finishes 4. **Residual Stress Management:** Account for transformation stresses during heat treatment 5. **Safety Factors:** Consider notch sensitivity at high hardness levels 6. **Corrosion Protection:** Requires protection in corrosive environments 7. **Temperature Limitations:** Consider maximum service temperature based on tempering ### **Economic Considerations** - **Material Cost:** Moderate to high (high carbon and molybdenum content) - **Processing Cost:** Higher due to specialized heat treatment requirements and precautions - **Tooling Cost:** Higher machining costs due to material hardness and abrasiveness - **Quality Control Costs:** Additional testing and inspection often required - **Total Cost:** Justified only for applications requiring its specific high-performance properties - **Life Cycle Cost:** Often favorable due to extended service life in demanding applications ### **Design Optimization Guidelines** 1. **Minimize Section Variations:** Reduce cracking risk during heat treatment 2. **Design for Heat Treatment:** Consider distortion and transformation during design 3. **Specify Appropriate Hardness:** Balance between wear resistance and toughness needs 4. **Consider Alternative Materials:** For applications not requiring maximum hardness 5. **Incorporate Quality Requirements:** Specify necessary testing and inspection --- ## **9. Comparative Analysis: High-Carbon Molybdenum Steels** | Grade | C% | Mo% | Max Hardness | Primary Strengths | Typical Applications | | :--- | :--- | :--- | :--- | :--- | :--- | | **4047** | 0.45-0.50 | 0.20-0.30 | 60-62 HRC | Maximum hardness, wear resistance, spring properties | Springs, wear parts, cutting edges | | **4150** | 0.48-0.53 | 0.15-0.25 | 60-62 HRC | Similar hardness with chromium addition | Similar applications, slightly better hardenability | | **4340** | 0.38-0.43 | 0.20-0.30 | 56-58 HRC | Superior toughness at high strength | Critical structural components | | **5147** | 0.45-0.50 | - | 58-60 HRC | High carbon without molybdenum | Lower cost alternative with less hardenability | | **8650** | 0.48-0.53 | 0.15-0.25 | 60-62 HRC | Similar with nickel addition | Improved toughness at high hardness | | **1095** | 0.90-1.03 | - | 64-66 HRC | Higher carbon for maximum hardness | Cutting tools, knives (more brittle) | ### **Performance Comparison in Key Applications** | Application | AISI 4047 Advantages | Limitations | Best For | | :--- | :--- | :--- | :--- | | **Springs** | High elastic limit, good fatigue, temper resistance | More expensive than spring steels | Heavy-duty, high-stress springs | | **Wear Parts** | Exceptional abrasion resistance, through-hardening | Brittle at maximum hardness | Abrasive wear applications | | **Cutting Edges** | Good hardness retention, wear resistance | Less tough than tool steels | Non-shock cutting applications | | **Fasteners** | Ultra-high strength potential | Difficult to form and machine | Critical high-strength fasteners | | **Shafts/Bearings** | Good wear resistance, hardness | Limited toughness at high hardness | Wear surfaces on shafts and bearings | --- ## **10. Technical Summary & Selection Guidelines** ### **Optimal Applications for AISI 4047** 1. **Heavy-Duty Springs:** Where maximum elastic limit and fatigue resistance are required 2. **Wear-Resistant Components:** Subject to severe abrasion or adhesive wear 3. **Cutting and Shearing Edges:** For industrial cutting applications not requiring shock resistance 4. **Ultra-High-Strength Fasteners:** For critical structural connections 5. **Machine Components:** Requiring maximum hardness and wear resistance ### **Selection Criteria** **Choose AISI 4047 when:** 1. Maximum hardness (58-62 HRC) is required for wear or cutting applications 2. High elastic limit is needed for spring applications 3. Exceptional abrasion resistance is the primary requirement 4. Components can be designed to minimize stress concentrations 5. Proper heat treatment facilities and expertise are available 6. The application justifies the higher material and processing costs **Consider Alternatives when:** 1. Shock resistance or high toughness is required (consider 4340 or similar) 2. Weldability is a primary fabrication method (consider lower-carbon grades) 3. Cost is a major constraint (consider 1045, 4140, or similar) 4. Corrosion resistance is needed without coatings (consider stainless steels) 5. Maximum machinability or formability is required (consider lower-carbon steels) 6. Very large sections require through-hardening (consider boron steels) ### **Processing Recommendations** 1. **Design Phase:** Consider heat treatment effects on dimensions and properties 2. **Material Preparation:** Specify proper annealing for machining operations 3. **Heat Treatment:** Use controlled atmosphere, proper quenching, immediate tempering 4. **Quality Control:** Implement thorough inspection after heat treatment 5. **Finishing:** Apply appropriate surface treatments for corrosion protection if needed 6. **Testing:** Conduct necessary mechanical and performance testing ### **Risk Management Considerations** 1. **Cracking Risk:** High during heat treatment; proper procedures essential 2. **Brittleness:** High at maximum hardness; design to minimize stress concentrations 3. **Decarburization:** Risk during heat treatment; use protective atmospheres 4. **Distortion:** Significant during heat treatment; allow for finishing operations 5. **Quality Consistency:** Requires strict process control and documentation --- ## **Market Position & Technical Significance** ### **Technical Significance** AISI 4047 occupies a unique position in the steel material spectrum as a high-carbon molybdenum alloy steel that bridges the gap between standard alloy steels and tool steels. Its 0.45-0.50% carbon content provides near-tool-steel hardness capabilities, while the molybdenum addition offers improved hardenability and temper resistance compared to plain high-carbon steels. This combination makes it particularly valuable for applications requiring the hardness of tool steels with better hardenability and somewhat improved toughness. ### **Market Position** - **Primary Markets:** North American heavy equipment, automotive spring, and industrial wear parts sectors - **Volume Usage:** Specialized, relatively low volume in specific applications - **Competitive Position:** Niche material for applications requiring its specific combination of properties - **Supply Availability:** Available from specialty steel producers and service centers - **Future Relevance:** Continues to be important for specific high-performance applications ### **Sustainability Considerations** - **Recyclability:** Fully recyclable at end of life - **Service Life:** Extended component life reduces replacement frequency - **Energy Efficiency:** Proper heat treatment maximizes performance per unit of energy input - **Material Efficiency:** High performance allows use of less material in some applications - **Manufacturing Efficiency:** Proper application reduces waste and rework --- **AISI 4047** represents a high-performance alloy steel designed for applications demanding the ultimate in hardness, wear resistance, and spring properties among standard alloy steels. Its combination of high carbon content with molybdenum alloying creates a material capable of exceptional performance in demanding wear, cutting, and spring applications. While requiring careful heat treatment, specialized fabrication techniques, and thorough quality control, AISI 4047 delivers outstanding performance where its specific properties are required. For engineers and manufacturers facing challenges with component wear, spring performance, or cutting applications where standard materials prove inadequate, AISI 4047 offers a viable solution that balances performance, processability, and cost. Its specification should be based on a thorough analysis of application requirements, consideration of alternatives, and availability of proper processing capabilities. When applied correctly in appropriate applications, AISI 4047 provides reliable, long-lasting performance that justifies its selection over more common materials. -:- For detailed product information, please contact sales. -: AISI 4047 Steel Specification Dimensions Size： Diameter 20-1000 mm Length <4027 mm Size:We can customized as required Standard： Per your request or drawing We can customized as required Properties（Theoretical） Chemical Composition -:- For detailed product information, please contact sales. -: AISI 4047 Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 4047 Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 4047 Steel Flange -:- For detailed product information, please contact sales. -:

Packing of AISI 4047 Steel Flange -:- For detailed product information, please contact sales. -: Standard Packing: -:- For detailed product information, please contact sales. -: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and Steel Flange drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 498 gallon liquid totes Special package is available on request. E FORUs’ is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition