AISI 4140H 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 4140H Steel Flange, annealed at 815°C (1500°F) furnace cooled 11°C (20°F)/hour to 665°C (1230°F), air cooled, 25 mm (1 in.) round Product Information -:- For detailed product information, please contact sales. -: AISI 4140H Steel Flange, annealed at 815°C (1500°F) furnace cooled 11°C (20°F)/hour to 665°C (1230°F), air cooled, 25 mm (1 in.) round Synonyms -:- For detailed product information, please contact sales. -:

AISI 4140H Steel, annealed at 815°C (1500°F) furnace cooled 11°C (20°F)/hour to 665°C (1230°F), air cooled, 25 mm (1 in.) round Product Information -:- For detailed product information, please contact sales. -: # **AISI 4140H Steel - Hardenability Controlled Annealed Product Specification** ## **1. Product Definition & Processing History** This specification covers **AISI 4140H** alloy steel supplied as **25 mm (1 inch) diameter round bars** processed to a fully annealed condition with the added assurance of **hardenability control** ("H" designation). The material has undergone a specific annealing cycle designed to produce maximum softness, optimal machinability, and a uniform microstructure throughout the cross-section. **Complete Processing History:** 1. **Material:** AISI 4140H (Hardenability-controlled per ASTM A304) 2. **Annealing Cycle:** - Austenitizing: 815°C (1500°F) - Cooling: Controlled furnace cooling at 11°C/hour (20°F/hour) to 665°C (1230°F) - Final Cooling: Air-cooled from 665°C to room temperature 3. **Product Form:** Hot-rolled or cold-finished round bar 4. **Final Condition:** Fully annealed with guaranteed hardenability characteristics 5. **Special Feature:** H-grade certification ensures consistent response to subsequent heat treatment ## **2. International Standards & Designations** - **Primary Standard:** ASTM A304 (Hardenability Requirements) & ASTM A29/A29M (Bars) - **Material Designation:** AISI 4140H (Annealed) - **"H" Designation Meaning:** Hardenability-controlled (guaranteed Jominy band) - **UNS Designation:** H41400 - **European Equivalent:** 1.7225H (42CrMo4H) per EN 10083-3 - **Japanese Equivalent:** SCM440H per JIS G4052 - **Chinese Equivalent:** 42CrMoH per GB/T 5216 - **ISO Equivalent:** 42CrMo4 with H-band, ISO 683-18 - **Condition Designation:** Annealed per ASTM A29, Grade Annealed ## **3. Chemical Composition (Weight % - H-Steel Philosophy)** *H-steels prioritize hardenability consistency over fixed chemistry limits* | Element | Composition Range (%) | Typical Aim (%) | H-Steel Manufacturing Logic | |---------|----------------------|-----------------|----------------------------| | **Carbon (C)** | 0.37 - 0.44 | 0.40 | May vary between heats while maintaining identical hardenability | | **Manganese (Mn)** | 0.70 - 1.00 | 0.85 | Wider range allows hardenability adjustment across production lots | | **Phosphorus (P)** | ≤ 0.030 | 0.020 | Lower maximum than standard 4140 for improved toughness | | **Sulfur (S)** | ≤ 0.030 | 0.020 | Controlled for consistent machinability across all heats | | **Silicon (Si)** | 0.15 - 0.35 | 0.25 | Standard range maintained | | **Chromium (Cr)** | 0.75 - 1.10 | 0.95 | Wider lower limit provides manufacturing flexibility | | **Molybdenum (Mo)** | 0.15 - 0.25 | 0.20 | Critical element for temper embrittlement resistance | | **Boron (B)*** | 0.0005 - 0.003 | Optional | May be added to enhance hardenability efficiency | **H-Steel Certification Concept:** - **Lot A:** C=0.39%, Mn=0.95%, Cr=0.85% - **Lot B:** C=0.43%, Mn=0.75%, Cr=1.05% - **Result:** Both exhibit **identical Jominy hardenability curves** despite different chemistry ## **4. Hardenability Characteristics - Certified Performance** *Guaranteed per ASTM A304 for this annealed material* ### **Jominy End-Quench Band (Typical for 4140H)** | Distance from Quenched End | Hardness Range, HRC (Band 3 Typical) | Significance for 25 mm Diameter | |----------------------------|--------------------------------------|---------------------------------| | **J₁ (1/16")** | 52 - 58 | Surface hardness after quenching | | **J₄ (4/16")** | 47 - 54 | Mid-radius equivalent | | **J₈ (8/16")** | 41 - 49 | Center of 25 mm bar | | **J₁₂ (12/16")** | 36 - 44 | Larger section capability | | **J₁₆ (16/16")** | 31 - 39 | Demonstrates deep hardening | **Hardenability Performance Metrics:** - **Ideal Critical Diameter (Dᵢ):** ~3.0 inches (76 mm) in oil - **95% Martensite Diameter (D₉₅):** ~2.3 inches (58 mm) in oil - **Grossmann Hardenability Factor:** 4.5 - 5.5 - **Assurance:** 100% consistency in heat treatment response across all production lots ## **5. Physical Properties (Annealed Condition)** | Property | Value | Technical Notes | |----------|-------|-----------------| | **Density** | 7.85 g/cm³ (0.284 lb/in³) | At 20°C | | **Melting Range** | 1420-1515°C (2590-2760°F) | Slightly wider due to H-steel chemistry variation | | **Modulus of Elasticity (E)** | 205 GPa (29.7 × 10⁶ psi) | Consistent across all heats | | **Shear Modulus (G)** | 80 GPa (11.6 × 10⁶ psi) | - | | **Poisson's Ratio (ν)** | 0.29 | - | | **Thermal Conductivity** | 42.6 W/m·K | At 100°C | | **Specific Heat Capacity** | 473 J/kg·K | At 20°C | | **Coefficient of Thermal Expansion** | 11.8 × 10⁻⁶ /K | 20-100°C range | | **Electrical Resistivity** | 0.22 µΩ·m | At 20°C | | **Magnetic Properties** | Ferromagnetic | Strongly magnetic | ## **6. Mechanical Properties (Annealed Condition)** *Minimum guaranteed properties for 25 mm diameter in specified annealed condition* | Property | Minimum Value | Typical Value | H-Steel Consistency* | |----------|---------------|---------------|----------------------| | **Hardness (Brinell)** | 197 HB | 207 HB | ±5 HB across heats | | **Hardness (Rockwell)** | 92 HRB | 98 HRB | ±2 HRB | | **Tensile Strength** | 655 MPa (95 ksi) | 725 MPa (105 ksi) | ±15 MPa | | **Yield Strength (0.2%)** | 415 MPa (60 ksi) | 485 MPa (70 ksi) | ±10 MPa | | **Elongation in 50 mm** | 25% | 28% | ±1.5% | | **Reduction of Area** | 50% | 55% | ±3% | | **Charpy V-Notch Impact** | 54 J (40 ft-lb) | 68 J (50 ft-lb) | ±10% | ***Consistency:** Statistical variation across different production lots* ## **7. Metallurgical Characteristics** **Microstructure After Specified Annealing:** - **Primary Structure:** Coarse pearlite in ferrite matrix - **Grain Size:** ASTM 5-7 (coarse due to slow cooling) - **Carbide Morphology:** Spheroidized and coalesced carbides - **Decarburization:** ≤ 0.38 mm (0.015 in) total depth on diameter - **Surface Condition:** Free from scale (shot blasted after annealing) - **Microcleanliness:** ASTM E45: A ≤ 2.0, B ≤ 1.5, C ≤ 1.0, D ≤ 1.5 **Annealing Cycle Rationale:** 1. **815°C Austenitizing:** Complete transformation to austenite 2. **11°C/hour Cooling:** Allows maximum carbide coalescence and softness 3. **665°C Transition:** Air cooling from this temperature prevents pearlite refinement 4. **Result:** Optimal machinability and uniform structure throughout 25 mm section ## **8. Machinability & Manufacturing Characteristics** ### **Machinability Advantages** - **Relative Machinability:** 70% (compared to 100% for B1112 steel) - **Rating:** Good for an alloy steel - **H-Steel Benefit:** Consistent tool life across different material lots - **Chip Formation:** Excellent - produces discontinuous, easily broken chips - **Surface Finish:** Capable of 1.6-3.2 µm Ra with proper technique ### **Recommended Machining Parameters** | Operation | Speed (m/min) | Feed (mm/rev) | Tool Recommendations | |-----------|--------------|---------------|----------------------| | **Turning** | 40-60 | 0.15-0.30 | C2/C6 carbide, positive rake | | **Drilling** | 20-30 | 0.10-0.20 | HSS-Co drills, peck drilling | | **Milling** | 35-50 | 0.10-0.25 | Carbide end mills | | **Tapping** | 5-10 | - | Premium HSS-E taps | | **Threading** | 20-35 | - | Carbide inserts | ### **Further Processing Compatibility** 1. **Subsequent Heat Treatment:** Ideal base condition for quenching and tempering 2. **Cold Forming:** Good for moderate deformation 3. **Welding:** Fair in annealed condition (requires preheat) 4. **Surface Hardening:** Excellent candidate for carburizing or induction hardening ## **9. Product Applications** This annealed 4140H product is specifically designed for: ### **High-Volume Automotive Components** - **Gear blanks** for transmission gears (before hobbing and heat treatment) - **Shaft blanks** requiring extensive machining before hardening - **Bearing races** and **sleeves** - **Suspension components** requiring precise machining ### **Aerospace Manufacturing** - **Landing gear components** (machined before final heat treatment) - **Engine mount brackets** and **fittings** - **Structural components** requiring complex machining - **Actuator components** ### **Oil & Gas Equipment** - **Valve bodies** and **components** requiring intricate machining - **Tool joint blanks** (API connections) - **Wellhead component blanks** - **Measurement tool housings** ### **General Precision Manufacturing** - **Die sets** and **mold bases** - **Jigs** and **fixtures** - **Machine tool components** - **Hydraulic manifold blocks** ### **Industries Where 4140H is Preferred Over Standard 4140** 1. **High-volume production** where heat treatment consistency is critical 2. **Regulated industries** requiring material certification 3. **Multi-sourcing scenarios** where material must be interchangeable 4. **Just-in-time manufacturing** where process reliability is essential ## **10. Quality Assurance & Certification** ### **Mandatory H-Steel Documentation** 1. **ASTM A304 Certificate of Compliance** 2. **Jominy Hardenability Curve** (actual test results from each heat) 3. **Chemical Analysis Report** (showing composition within H-steel ranges) 4. **Mechanical Test Reports** from annealed condition 5. **Grain Size Certification** (ASTM 5 or finer required) ### **Enhanced Testing Available** - **Ultrasonic Testing:** Per ASTM A388 - **Magnetic Particle Inspection:** Per ASTM A275/A966 - **Macroetch Testing:** For internal soundness - **Sulfur Print Testing:** Inclusion morphology analysis - **Hardenability Verification:** Additional Jominy tests if required ### **Traceability Requirements** - **Heat Number:** Unique identifier traceable to melt - **Annealing Lot:** Specific to this annealing cycle - **Test Coupon Identification:** Linked to production material - **Mill Origin:** Country and mill of manufacture ## **11. Advantages of 4140H in Annealed Condition** ### **Technical Advantages** 1. **Predictable Heat Treatment Response:** Guaranteed hardenability eliminates process variation 2. **Consistent Machinability:** Uniform hardness across all production lots 3. **Reduced Risk:** Eliminates heat treatment failures due to material variability 4. **Interchangeability:** Different lots can be mixed in production without process changes 5. **Optimized Annealing:** Controlled slow cooling produces optimal machinability ### **Economic Advantages** 1. **Reduced Scrap:** Lower rejection rate in heat treatment 2. **Process Optimization:** Enables statistical process control 3. **Lower Inventory:** Reduced safety stock due to material consistency 4. **Quality Cost Reduction:** Fewer inspections and tests required ### **Comparison: 4140H vs. Standard 4140 (Annealed)** | Parameter | AISI 4140H (This Product) | Standard AISI 4140 | |-----------|---------------------------|-------------------| | **Hardenability Guarantee** | Yes - certified Jominy band | No - variable | | **Chemistry Consistency** | Variable within H-ranges | More consistent | | **Heat Treatment Results** | Identical across all lots | May require adjustment | | **Machining Consistency** | Excellent | Good | | **Certification** | Full Jominy certification | Standard MTR only | | **Cost Premium** | 10-15% | Base cost | ## **12. Design & Engineering Considerations** ### **Optimal Application Parameters** - **Diameter:** 25 mm is ideal for this annealing cycle - **Section Thickness:** Up to 50 mm respond well to this treatment - **Complexity:** Suitable for complex geometries requiring extensive machining - **Final Properties:** Designed for subsequent heat treatment to 800-1200 MPa tensile ### **Subsequent Heat Treatment Guidelines** ``` For components machined from this material: 1. STRESS RELIEVE (optional): 595-650°C (1100-1200°F) after rough machining 2. AUSTENITIZE: 845-870°C (1550-1600°F) for 30 min/inch 3. QUENCH: Oil, 40-60°C, agitated 4. TEMPER: According to desired final hardness 5. KEY ASSURANCE: Identical results regardless of material lot ``` ## **13. Available Product Forms & Specifications** ### **Standard Product Details** - **Diameter:** 25.0 mm ±0.2 mm (0.984" ±0.008") - **Length:** 3-6 meters (10-20 feet), cut lengths available - **Straightness:** ≤ 1.0 mm/m (0.012 in/ft) - **Surface Condition:** Shot blasted, light oiled for corrosion protection - **End Condition:** Square cut, deburred - **Identification:** Heat number stamped on one end ### **Packaging & Handling** - **Packaging:** Bundled with steel straps, protected corners - **Weight per Meter:** 3.85 kg/m (2.59 lb/ft) - **Bundle Size:** Typically 500-2000 kg - **Storage:** Indoor, dry environment recommended - **Shelf Life:** 12+ months with proper storage ## **14. Technical Calculations & Predictions** ### **Hardenability-Based Predictions** **For 25 mm diameter after oil quenching:** - Surface Hardness: 54-58 HRC - ¼ Radius Hardness: 50-54 HRC - Center Hardness: 46-50 HRC - Uniformity: Within 4 HRC points through section ### **Machining Time Estimates** Based on 207 HB hardness: - **Turning:** 15-20% faster than normalized 4140 - **Drilling:** 20-25% faster than as-rolled 4140 - **Tool Life:** 30-40% longer than irregularly annealed material ### **Heat Treatment Response Prediction** - **Martensite Start (Mₛ):** ~345°C (consistent ±5°C across lots) - **Quench Rate Required:** 25-30°C/sec at 700°C - **Tempering Response:** Predictable hardness drop per tempering temperature ## **15. Industry-Specific Applications** ### **Automotive Tier 1 Suppliers** - Use 4140H for transmission components to ensure consistent case hardening depth - Enables statistical process control in high-volume gear production - Reduces PPAP (Production Part Approval Process) complexity ### **Aerospace Manufacturing** - Required for flight-critical components where material certification is mandatory - Enables multi-source procurement without requalification - Supports AS9100 quality system requirements ### **Defense Contractors** - Meets MIL-STD requirements for material consistency - Supports first article inspection requirements - Enables interchangeability in maintenance and repair operations ### **Medical Equipment** - Used for surgical instrument components requiring precision machining - Ensures consistent performance after final heat treatment - Supports FDA quality system regulations --- ## **Summary: Value Proposition** **This AISI 4140H annealed product delivers:** 1. **Guaranteed Consistency:** Certified hardenability ensures identical heat treatment response 2. **Optimal Machinability:** Controlled annealing produces maximum softness 3. **Reduced Risk:** Eliminates material-related heat treatment failures 4. **Process Efficiency:** Enables lean manufacturing and reduced inspection 5. **Quality Assurance:** Full traceability and certification package **Economic Justification:** The 10-15% cost premium over standard 4140 is typically recovered through: - 5-10% reduction in machining time - 2-5% reduction in heat treatment scrap - Reduced quality control costs - Elimination of process development for each material lot **Strategic Application:** This material is particularly valuable when: - Component failure has high economic or safety consequences - Production involves multiple heat treat batches over time - Manufacturing is distributed across multiple locations - Regulatory compliance requires full material certification --- **Final Recommendation:** Specify AISI 4140H in this annealed condition when material consistency is critical to your manufacturing process or product performance. The assurance of identical heat treatment response across all production lots provides a level of predictability and reliability that standard grades cannot match. **Quality Statement:** This product represents the convergence of metallurgical science and quality engineering, delivering not just a material, but a guaranteed performance envelope that enables precision manufacturing and reliable end-use performance. --- **Disclaimer:** This product specification is for technical reference. Actual properties may vary based on specific manufacturing processes and testing methods. For critical applications, always verify current certifications, conduct incoming inspection, and perform appropriate qualification testing. The H-steel certification provides assurance of consistency but does not guarantee absolute values beyond the certified ranges. Always consult with materials engineering specialists for safety-critical applications. -:- For detailed product information, please contact sales. -: AISI 4140H Steel, annealed at 815°C (1500°F) furnace cooled 11°C (20°F)/hour to 665°C (1230°F), air cooled, 25 mm (1 in.) round Specification Dimensions Size： Diameter 20-1000 mm Length <4049 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 4140H Steel, annealed at 815°C (1500°F) furnace cooled 11°C (20°F)/hour to 665°C (1230°F), air cooled, 25 mm (1 in.) round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 4140H Steel Flange, annealed at 815°C (1500°F) furnace cooled 11°C (20°F)/hour to 665°C (1230°F), air cooled, 25 mm (1 in.) round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 4140H Steel Flange, annealed at 815°C (1500°F) furnace cooled 11°C (20°F)/hour to 665°C (1230°F), air cooled, 25 mm (1 in.) round -:- For detailed product information, please contact sales. -:

Packing of AISI 4140H Steel Flange, annealed at 815°C (1500°F) furnace cooled 11°C (20°F)/hour to 665°C (1230°F), air cooled, 25 mm (1 in.) round -:- 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 520 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