AISI 4137 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 4137 Steel Flange Product Information -:- For detailed product information, please contact sales. -: AISI 4137 Steel Flange Synonyms -:- For detailed product information, please contact sales. -:

AISI 4137 Steel Product Information -:- For detailed product information, please contact sales. -: # AISI 4137 Alloy Steel Product Overview ## **Introduction** AISI 4137 is a medium-carbon, chromium-molybdenum alloy steel known for its excellent combination of high strength, good toughness, and fatigue resistance. As a member of the chromium-molybdenum (chromoly) family, it offers superior mechanical properties compared to plain carbon steels, particularly in larger cross-sections. This steel is widely used in heat-treated conditions where a balance of core strength and surface hardness is required. ## **International Standards & Designations** * **USA:** AISI 4137, ASTM A29/A29M (Standard Specification for Steel Bars, Carbon and Alloy) * **Europe:** Equivalent to **1.6563** (34CrMo4/35CrMo4) with specific compositional range * **Japan:** Equivalent to SCM435 (JIS G4105) * **China:** Equivalent to 35CrMo (GB/T 3077) * **ISO:** 34CrMo4 (ISO 683-18) * **UNS:** G41370 ## **Chemical Composition (Weight %)** The composition is carefully balanced to provide optimal hardenability and mechanical properties. | Element | Min (%) | Max (%) | Primary Function | | :--- | :--- | :--- | :--- | | **Carbon (C)** | 0.35 | 0.40 | Provides strength and hardenability; higher than 4135 for increased strength | | **Manganese (Mn)** | 0.70 | 0.90 | Enhances hardenability and strength | | **Phosphorus (P)** | - | 0.035 | Residual element (controlled for embrittlement) | | **Sulfur (S)** | - | 0.040 | Residual element (affects machinability) | | **Silicon (Si)** | 0.15 | 0.35 | Deoxidizer, strengthens ferrite | | **Chromium (Cr)** | 0.80 | 1.10 | Improves hardenability, wear resistance, and corrosion resistance | | **Molybdenum (Mo)** | 0.15 | 0.25 | Enhances hardenability, high-temperature strength, and reduces temper embrittlement | ## **Physical & Mechanical Properties** ### **Physical Properties (Annealed Condition)** * **Density:** 7.85 g/cm³ (0.284 lb/in³) * **Melting Point:** Approximately 1,425°C (2,597°F) * **Modulus of Elasticity (Young's Modulus):** 205 GPa (29,700 ksi) * **Poisson's Ratio:** 0.29 * **Thermal Conductivity:** 42.6 W/m·K (at 100°C) * **Electrical Resistivity:** 0.22 µΩ·m * **Specific Heat Capacity:** 473 J/kg·K * **Coefficient of Thermal Expansion:** 11.7 µm/m·K (20-100°C) ### **Mechanical Properties (Typical Values)** Properties vary significantly with heat treatment condition. #### **Annealed Condition (Typical)** * **Tensile Strength:** 655-795 MPa (95-115 ksi) * **Yield Strength:** 415 MPa min (60 ksi min) * **Elongation (in 50 mm):** 25% min * **Reduction of Area:** 50% min * **Hardness:** 197-229 HB (Brinell) #### **Normalized Condition (Typical)** * **Tensile Strength:** 690-860 MPa (100-125 ksi) * **Yield Strength:** 480 MPa min (70 ksi min) * **Hardness:** 207-241 HB #### **Quenched & Tempered Condition** *Quenched from 845-870°C (1550-1600°F) in oil, tempered at various temperatures* | Tempering Temperature | Tensile Strength | Yield Strength | Elongation | Hardness (HRC) | Impact Energy | | :--- | :--- | :--- | :--- | :--- | :--- | | 205°C (400°F) | 1,585 MPa (230 ksi) | 1,380 MPa (200 ksi) | 11% | 50-54 | 16-27 J (12-20 ft-lb) | | 425°C (800°F) | 1,240 MPa (180 ksi) | 1,100 MPa (160 ksi) | 14% | 40-44 | 27-41 J (20-30 ft-lb) | | 540°C (1000°F) | 1,030 MPa (150 ksi) | 930 MPa (135 ksi) | 17% | 33-37 | 41-54 J (30-40 ft-lb) | | 650°C (1200°F) | 795 MPa (115 ksi) | 690 MPa (100 ksi) | 21% | 25-29 | 54-68 J (40-50 ft-lb) | ## **Heat Treatment** AISI 4137 responds well to various heat treatments: 1. **Annealing:** Heat to 815-870°C (1500-1600°F), slow furnace cool 2. **Normalizing:** Heat to 870-925°C (1600-1700°F), air cool 3. **Hardening (Quenching):** Austenitize at 845-870°C (1550-1600°F), oil quench 4. **Tempering:** Immediately after quenching, temper at 205-650°C (400-1200°F) based on desired hardness/toughness balance 5. **Surface Hardening:** Excellent candidate for induction hardening, flame hardening, or carburizing (case hardening) **Hardenability:** AISI 4137 has good to excellent hardenability with an ideal critical diameter (Dᵢ) of approximately 2.5-3.0 inches (63-76 mm) in still water. ## **Product Applications** AISI 4137 is utilized across multiple industries for critical, high-stress components: * **Automotive & Transportation:** Axle shafts, drive shafts, crankshafts, connecting rods, gears, steering knuckles, king pins, high-strength bolts and studs * **Oil & Gas Industry:** Drill collars, tool joints, sucker rods, valve components, wellhead equipment * **Agricultural Machinery:** Gears, shafts, spindles, and other high-wear components * **Construction Equipment:** Track pins, bushings, pivot pins, hydraulic cylinder rods * **Aerospace:** Landing gear components, engine mounts, structural fittings * **Industrial Machinery:** High-strength fasteners, sprockets, couplings, machine tool components, piston rods * **Power Transmission:** Heavy-duty shafts, gears, and bearings ## **Manufacturing Characteristics** * **Machinability:** Fair (60% relative to AISI 1112 steel) in annealed condition; improves with proper heat treatment * **Weldability:** Fair to good with precautions; preheating (150-260°C/300-500°F) and post-weld heat treatment recommended for optimal results * **Forging:** Heat to 1150-1260°C (2100-2300°F), do not forge below 870°C (1600°F) * **Cold Working:** Possible in annealed condition but limited due to medium carbon content ## **Key Advantages** 1. **High Strength-to-Weight Ratio:** Provides excellent strength with reasonable weight 2. **Good Toughness & Fatigue Resistance:** Maintains impact resistance even at high strength levels 3. **Excellent Hardenability:** Suitable for larger cross-sections compared to plain carbon steels 4. **Versatility in Heat Treatment:** Can be through-hardened or surface-hardened based on application requirements 5. **Good Wear Resistance:** Particularly when surface-hardened 6. **Resistance to Temper Embrittlement:** Molybdenum content helps prevent embrittlement during tempering in critical temperature ranges ## **Available Product Forms** * Round, Square, and Hexagonal Bars (hot-rolled or cold-drawn) * Billets and Blooms * Forged Components * Seamless Tubing * Plate (limited availability) ## **Comparison with Similar Grades** * **vs. AISI 4135:** 4137 has higher carbon content (0.35-0.40% vs. 0.33-0.38%), resulting in higher strength and hardness capability * **vs. AISI 4140:** 4137 has lower carbon (0.35-0.40% vs. 0.38-0.43%) and slightly lower hardenability, offering better weldability and toughness at comparable strength levels * **vs. AISI 4340:** 4137 has lower nickel content, making it more cost-effective for applications not requiring the extreme toughness of 4340 ## **Quality Considerations** When specifying AISI 4137, consider: * **Material Cleanliness:** For critical applications, specify vacuum-degassed or ESR/VAR remelted steel * **Non-Destructive Testing:** Ultrasonic, magnetic particle, or dye penetrant testing for defect detection * **Grain Size:** Typically fine grain practice (ASTM 5-8) * **Hardenability:** For applications requiring consistent through-hardening, consider specifying to ASTM A304 H-band requirements (though 4137 is not typically supplied as an "H" steel) ## **Environmental Considerations** AISI 4137 contains chromium and molybdenum, which should be considered in recycling and disposal processes. Proper industrial hygiene practices should be followed during machining and welding to minimize exposure to metal fumes. --- **Note:** The properties and performance characteristics mentioned are typical values. For specific applications, consult with material engineers and refer to applicable standards and specifications. Actual performance depends on manufacturing processes, heat treatment parameters, and application conditions. -:- For detailed product information, please contact sales. -: AISI 4137 Steel Specification Dimensions Size： Diameter 20-1000 mm Length <4037 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 4137 Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 4137 Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 4137 Steel Flange -:- For detailed product information, please contact sales. -:

Packing of AISI 4137 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 508 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