AISI 4135H 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 4135H Steel Flange Product Information -:- For detailed product information, please contact sales. -: AISI 4135H Steel Flange Synonyms -:- For detailed product information, please contact sales. -:

AISI 4135H Steel Product Information -:- For detailed product information, please contact sales. -: # AISI 4135H Steel Product Overview ## **Introduction** AISI 4135H is a chromium-molybdenum alloy steel supplied under the "H" designation, which indicates controlled hardenability as defined by ASTM standards. This medium-carbon, low-alloy steel offers an excellent balance of strength, toughness, and wear resistance, particularly after appropriate heat treatment. Its superior hardenability over standard carbon steels makes it a preferred choice for high-stress, high-strength components. ## **International Standards & Designations** * **USA:** AISI 4135H, ASTM A304 (Standard Specification for Carbon and Alloy Steel Bars Subject to End-Quench Hardenability Requirements) * **Europe:** Equivalent to **1.6562** (34CrMo4) with H-band specifications * **Japan:** Equivalent to SCM435H (JIS G4052) * **ISO:** 34CrMo4 (ISO 683-18) ## **Chemical Composition (Weight % - Typical)** The composition is carefully balanced to ensure the specified hardenability band (H-band). | Element | Min (%) | Max (%) | Primary Function | | :--- | :--- | :--- | :--- | | **Carbon (C)** | 0.33 | 0.38 | Provides core strength and hardenability. | | **Manganese (Mn)** | 0.70 | 1.00 | Increases hardenability and strength. | | **Phosphorus (P)** | - | 0.030 | Impurity (controlled for embrittlement). | | **Sulfur (S)** | - | 0.030 | Impurity (affects machinability). | | **Silicon (Si)** | 0.15 | 0.35 | Deoxidizer, increases strength. | | **Chromium (Cr)** | 0.80 | 1.10 | Enhances hardenability, corrosion/oxidation resistance. | | **Molybdenum (Mo)** | 0.15 | 0.25 | Increases hardenability, strength at high temperatures, reduces temper embrittlement. | *Note: Boron (B) may be added in trace amounts to further enhance hardenability for certain applications.* ## **Physical & Mechanical Properties** Properties vary significantly with heat treatment condition. Below are typical ranges. ### **As-Automatically Annealed (Typical)** * **Tensile Strength:** 620 - 800 MPa * **Yield Strength:** ≥ 415 MPa * **Elongation:** ≥ 25% * **Hardness:** ~ 180 - 220 Brinell ### **After Quenching & Tempering (Typical)** * **Tensile Strength:** 900 - 1200+ MPa (Adjustable via tempering temperature) * **Yield Strength:** 750 - 1000+ MPa * **Elongation:** 12% - 18% * **Reduction of Area:** 45% - 60% * **Hardness:** 28 - 40 HRC (Typical for many applications) * **Impact Toughness (Charpy V-notch):** Good to excellent, depending on strength level. ### **Physical Properties (Approximate)** * **Density:** 7.85 g/cm³ * **Modulus of Elasticity:** 205 GPa * **Poisson's Ratio:** 0.29 * **Thermal Conductivity:** ~ 42 W/m·K (at 100°C) ## **Heat Treatment** AISI 4135H is specifically designed for parts requiring through-hardening. * **Austenitizing:** ~ 830°C - 860°C (Oil quench typically) * **Tempering:** 540°C - 660°C (Temperature selected based on desired final strength/ductility) * **Surface Hardening:** Also well-suited for processes like **induction hardening** and **carburizing** (case hardening) to create a hard, wear-resistant surface over a tough core. ## **Product Applications** AISI 4135H is widely used in the manufacture of critical, high-performance components across several demanding industries: * **Automotive & Trucking:** Axle shafts, differential gears, crankshafts, steering components, kingpins, high-strength bolts. * **Oil & Gas:** Drill collars, tool joints, valve components, downhole equipment requiring high strength and good fatigue resistance. * **Aerospace:** Landing gear components, engine mounts, high-strength structural fittings. * **General Engineering:** Gears, sprockets, piston rods, hydraulic cylinders, high-stress fasteners, and other machinery parts requiring a good strength-to-weight ratio. * **Power Transmission:** Shafting, couplings, and other drive train components. ## **Key Advantages** 1. **Controlled Hardenability (H-Steel):** Consistent performance regardless of lot variation, ensuring predictable heat treatment response and core properties, especially in larger cross-sections. 2. **Excellent Strength/Toughness Balance:** Can be heat-treated to achieve high strength while retaining good impact toughness and fatigue strength. 3. **Good Wear Resistance:** Especially after surface hardening treatments. 4. **Weldability & Machinability:** Fair to good in the annealed condition (pre-hardening). Requires pre-heat and post-weld heat treatment for welded assemblies. 5. **Versatility:** Suitable for both through-hardening and case hardening processes. ## **Available Product Forms** * Round, Square, and Hexagonal Bars * Forged Blooms and Billets * Seamless Tubing In summary, **AISI 4135H** is a versatile and reliable alloy steel engineered for applications demanding high strength, good toughness, and consistent performance under stress. Its status as an "H-steel" makes it a specification-grade material for critical components where predictable heat treatment results are paramount. -:- For detailed product information, please contact sales. -: AISI 4135H Steel Specification Dimensions Size： Diameter 20-1000 mm Length <4036 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 4135H Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 4135H Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 4135H Steel Flange -:- For detailed product information, please contact sales. -:

Packing of AISI 4135H 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 507 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