AISI 4130H 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 4130H Steel Flange, Product Information -:- For detailed product information, please contact sales. -: AISI 4130H Steel Flange, Synonyms -:- For detailed product information, please contact sales. -:

AISI 4130H Steel, Product Information -:- For detailed product information, please contact sales. -: # **Product Datasheet: AISI 4130H Hardenability Steel (UNS H41300)** ## **Overview** AISI 4130H is a **hardenability-controlled variant** of the popular AISI 4130 chromium-molybdenum alloy steel, distinguished by its guaranteed and consistent response to heat treatment. The "H" designation signifies that the steel's chemical composition is precisely balanced to meet specific hardenability requirements as defined by end-quench (Jominy) test standards. This ensures predictable mechanical properties throughout the cross-section of heat-treated components, particularly in critical applications where batch-to-batch consistency is paramount. ## **Key Features** - **Guaranteed hardenability** for consistent heat treatment results - **Superior through-hardening capability** in medium to large sections - **Excellent strength-to-weight ratio** - **Good impact resistance and fatigue strength** - **Predictable mechanical properties** across production lots --- ## **International Standards & Designations** | **Standard System** | **Designation** | **Specification** | |---------------------|-----------------|-------------------| | **UNS** | H41300 | - | | **AISI/SAE** | 4130H | SAE J1268 | | **ASTM** | A304 | Carbon and Alloy Steel Bars Subject to End-Quench Hardenability Requirements | | **AMS** | - | - | | **European (EN)** | 1.7218H | 25CrMo4 (Hardenability variant) | | **German (DIN)** | 1.7218H | 25CrMo4 (Hardenability variant) | | **Japanese (JIS)** | SCM430H | - | *Note: The "H" suffix is crucial and distinguishes this grade from standard 4130.* --- ## **Chemical Composition (Weight %)** | **Element** | **Minimum (%)** | **Maximum (%)** | **Typical (%)** | |-------------|----------------|-----------------|-----------------| | **Carbon (C)** | 0.28 | 0.33 | 0.30 | | **Manganese (Mn)** | 0.40 | 0.80 | 0.65 | | **Silicon (Si)** | 0.15 | 0.35 | 0.25 | | **Chromium (Cr)** | 0.80 | 1.10 | 0.95 | | **Molybdenum (Mo)** | 0.15 | 0.25 | 0.20 | | **Phosphorus (P)** | - | 0.035 | 0.020 | | **Sulfur (S)** | - | 0.040 | 0.025 | | **Iron (Fe)** | Balance | | | *Note: The composition ranges are slightly broader than standard 4130 but are controlled to achieve specific hardenability bands.* --- ## **Hardenability Bands (SAE J1268)** The defining characteristic of 4130H is its controlled hardenability, specified as a range of hardness values at various distances from the quenched end in a Jominy test. ### **Typical Hardenability Band (HRC at specified Jominy distances):** | **Distance from Quenched End** | **Minimum HRC** | **Maximum HRC** | |--------------------------------|-----------------|-----------------| | **1.5 mm (1/16 in)** | 48 | 57 | | **3 mm (1/8 in)** | 45 | 55 | | **5 mm (3/16 in)** | 40 | 52 | | **7 mm (1/4 in)** | 35 | 48 | | **10 mm (3/8 in)** | 30 | 43 | | **13 mm (1/2 in)** | 26 | 38 | | **16 mm (5/8 in)** | 24 | 35 | --- ## **Physical Properties** | **Property** | **Metric** | **Imperial** | |--------------|------------|--------------| | **Density** | 7.85 g/cm³ | 0.284 lb/in³ | | **Melting Point** | 1427-1510°C | 2600-2750°F | | **Modulus of Elasticity** | 205 GPa | 29.7 × 10⁶ psi | | **Poisson's Ratio** | 0.29 | 0.29 | | **Thermal Conductivity** | 42.7 W/m·K @ 100°C | 247 BTU·in/hr·ft²·°F | | **Specific Heat Capacity** | 460 J/kg·K @ 20°C | 0.11 BTU/lb·°F | | **Coefficient of Thermal Expansion** | 12.3 μm/m·°C (20-100°C) | 6.8 μin/in·°F | --- ## **Mechanical Properties** ### **As-Hot Rolled Condition** - **Tensile Strength:** 560-700 MPa (81-102 ksi) - **Yield Strength:** 360 MPa min (52 ksi min) - **Elongation:** 22% min - **Reduction of Area:** 50% min - **Hardness:** 179-229 HB ### **Normalized Condition (899-927°C/1650-1700°F, air cooled)** - **Tensile Strength:** 670 MPa min (97 ksi min) - **Yield Strength:** 435 MPa min (63 ksi min) - **Elongation:** 25% min - **Hardness:** 197-229 HB ### **Quenched & Tempered Condition** *Properties vary with tempering temperature:* | **Tempering Temperature** | **Tensile Strength** | **Yield Strength** | **Elongation** | **Hardness** | |---------------------------|----------------------|-------------------|----------------|--------------| | **540°C (1000°F)** | 930-1080 MPa | 760 MPa min | 18% min | 28-32 HRC | | | (135-157 ksi) | (110 ksi min) | | | | **425°C (800°F)** | 1080-1240 MPa | 930 MPa min | 15% min | 32-36 HRC | | | (157-180 ksi) | (135 ksi min) | | | | **315°C (600°F)** | 1240-1380 MPa | 1080 MPa min | 12% min | 36-40 HRC | | | (180-200 ksi) | (157 ksi min) | | | --- ## **Heat Treatment Guidelines** ### **1. Annealing** - **Full Annealing:** Heat to 843-871°C (1550-1600°F), slow furnace cool to below 538°C (1000°F) - **Process Annealing:** Heat to 732-788°C (1350-1450°F), air cool - **Annealed Hardness:** ≤ 197 HB ### **2. Normalizing** - **Temperature:** 899-927°C (1650-1700°F) - **Cooling:** Air cool - **Purpose:** Grain refinement and homogenization ### **3. Hardening** - **Austenitizing Temperature:** 871-899°C (1600-1650°F) - **Quenching Medium:** Oil (preferred) or water - **Preheating:** Recommended for sections > 25 mm (1 inch) ### **4. Tempering** - **Temperature Range:** 315-650°C (600-1200°F) - **Holding Time:** 1 hour per inch of thickness (minimum) - **Cooling:** Air cool or rapid cool to prevent temper embrittlement - **Stress Relieving:** 550-650°C (1025-1200°F) --- ## **Product Forms** ### **Primary Forms:** 1. **Hot-Rolled Bars** - Round bars: 5-300 mm diameter - Square bars: 5-150 mm - Flat bars: Various thicknesses and widths 2. **Cold-Finished Bars** - Cold-drawn rounds, hexagons, squares - Turned and polished shafts 3. **Forging Stock** - Billets and blooms for open-die and closed-die forging 4. **Seamless Tubing** - For structural and mechanical applications 5. **Plates and Sheets** - Hot-rolled plates up to 150 mm thick - Sheets in various gauges --- ## **Applications** ### **Aerospace Industry** - **Aircraft Landing Gear:** Components requiring consistent through-hardening - **Engine Mounts and Brackets** - **Structural Airframe Components** - **Helicopter Rotor Parts** - **Fasteners and Bolts** requiring guaranteed hardenability ### **Automotive Industry** - **High-Performance Gears and Shafts** - **Racing Components:** Chassis parts, suspension components - **Transmission Parts** - **High-Strength Fasteners** ### **Oil and Gas Industry** - **Drilling Equipment:** Drill collars, stabilizers - **Valve Bodies and Components** - **Tool Joints and Connections** - **Downhole Tools** ### **Industrial Machinery** - **Heavy-Duty Axles and Shafts** - **Gear Blanks for Large Gears** - **High-Stress Bolts and Studs** - **Hydraulic Cylinder Rods** - **Machine Tool Components** ### **Defense Applications** - **Armored Vehicle Components** - **Weapon System Parts** - **Military Vehicle Axles and Drivetrains** --- ## **Machining and Fabrication** ### **Machinability** - **Annealed Condition:** Good machinability (65% of 1212 steel) - **Hardened Condition:** Requires carbide tools and reduced speeds - **Recommended Cutting Speeds:** - Annealed: 45-60 m/min (150-200 SFM) with HSS tools - Hardened: 15-30 m/min (50-100 SFM) with carbide tools ### **Welding Characteristics** - **Weldability:** Good with proper procedures - **Preheating:** 150-260°C (300-500°F) for thicknesses > 25 mm - **Post-Weld Heat Treatment:** Recommended to restore properties - **Filler Metals:** - SMAW: E10018-D2, E11018-D2 - GTAW/GMAW: ER80S-D2, ER90S-D2 - SAW: Compatible flux-wire combinations ### **Cold Working** - **Formability:** Good in annealed condition - **Bending:** Minimum bend radius = 2 × thickness - **Cold Heading:** Suitable in annealed or spheroidized condition --- ## **Quality Control and Testing** ### **Standard Testing Requirements:** 1. **Chemical Analysis:** Spectroscopic or wet chemical methods 2. **Hardenability Test:** Jominy end-quench per SAE J1268 3. **Mechanical Testing:** Tensile, impact, hardness 4. **Non-Destructive Testing:** UT, MT, PT as required 5. **Microstructure Examination:** Grain size, inclusion rating ### **Certification Requirements:** - **Mill Test Certificate:** EN 10204 3.1 or equivalent - **Hardenability Report:** Showing actual Jominy curve - **Traceability:** Heat/lot number identification --- ## **Advantages of 4130H vs. Standard 4130** | **Aspect** | **AISI 4130H** | **AISI 4130** | |------------|----------------|---------------| | **Hardenability Control** | Guaranteed bands | General ranges | | **Consistency** | Batch-to-batch uniformity | Normal variations | | **Heat Treatment Predictability** | High | Moderate | | **Quality Assurance** | Stringent testing | Standard testing | | **Critical Applications** | Preferred | Acceptable | | **Cost** | Slightly higher | Standard | --- ## **Technical Considerations** ### **1. Section Size Limitations** - **Effective Through-Hardening:** Up to 75-100 mm (3-4 inches) diameter with oil quenching - **Surface Hardness:** Consistent to specified depth - **Core Properties:** Predictable based on Jominy data ### **2. Distortion Control** - **Minimized by:** Controlled hardenability and proper quenching technique - **Recommended:** Fixturing during quenching for critical dimensions ### **3. Temper Embrittlement** - **Susceptibility:** Moderate in certain temperature ranges - **Prevention:** Rapid cooling from tempering temperatures above 375°C (700°F) - **Critical Range:** 375-575°C (700-1070°F) --- ## **Storage and Handling** ### **Best Practices:** 1. **Storage Conditions:** Dry, covered storage to prevent rust 2. **Identification:** Maintain heat/lot markings throughout processing 3. **Handling:** Use appropriate lifting equipment for heavy sections 4. **Surface Protection:** Apply rust preventive oils if long-term storage is required --- ## **Industry Specifications Compliance** ### **Aerospace:** - AMS 2301: Cleanliness requirements - AMS 2759: Pyrometry requirements - NADCAP accreditation for heat treatment ### **Automotive:** - IATF 16949 quality management - PPAP (Production Part Approval Process) requirements ### **General Industry:** - ISO 9001 quality systems - Customer-specific requirements --- ## **Comparison with Similar Grades** | **Grade** | **Carbon (%)** | **Key Differences** | **Typical Applications** | |-----------|----------------|---------------------|--------------------------| | **4130H** | 0.28-0.33 | Controlled hardenability | Critical structural parts | | **4140H** | 0.38-0.43 | Higher strength | Heavier duty components | | **4340H** | 0.38-0.43 | Nickel addition | Ultra-high strength parts | | **8630H** | 0.28-0.33 | Nickel-chromium-molybdenum | Case hardening applications | --- ## **Supplier Information** ### **Typical Delivery Conditions:** - **Hot-rolled:** Black, scaled surface - **Cold-drawn:** Bright finish, closer tolerances - **Annealed:** Soft condition for machining - **Normalized:** For improved machinability - **Rough turned:** For shaft applications ### **Lead Times:** - **Standard sizes:** 2-4 weeks - **Special sizes:** 4-8 weeks - **Certified material:** Additional 1-2 weeks --- ## **Environmental and Safety Considerations** ### **Material Safety:** - **General Handling:** No special precautions required - **Machining:** Use appropriate coolant and ventilation - **Welding:** Follow standard welding safety procedures - **Disposal:** Recyclable as ferrous scrap ### **Compliance:** - **REACH:** Compliant - **RoHS:** Compliant - **Conflict Minerals:** DRC conflict-free --- ## **Technical Support and Resources** ### **Available Services:** 1. **Material Selection Assistance** 2. **Heat Treatment Consultation** 3. **Failure Analysis** 4. **Technical Data Sheets** 5. **Processing Guidelines** ### **Contact Information:** For specific technical inquiries, test reports, or custom requirements, please contact our technical support department with the material heat number and application details. --- **Disclaimer:** The information contained in this datasheet is for general guidance only. Properties may vary depending on manufacturing process, heat treatment, and section size. Users should conduct their own tests to verify suitability for specific applications. Always consult with qualified engineers for critical applications. -:- For detailed product information, please contact sales. -: AISI 4130H Steel, Specification Dimensions Size： Diameter 20-1000 mm Length <4034 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 4130H Steel, Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 4130H Steel Flange, -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 4130H Steel Flange, -:- For detailed product information, please contact sales. -:

Packing of AISI 4130H 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 505 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