AISI 4135H Steel Rod/Bar

AISI 4135H Steel Rod Product Information -:- For detailed product information, please contact sales. -: AISI 4135H Steel Rod 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 Rod -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 4135H Steel Rod -:- For detailed product information, please contact sales. -:

Packing of AISI 4135H Steel Rod -:- 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 Rod 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