AISI 4135H Steel Foil/Strip

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

AISI 4135H Steel Product Information -:- For detailed product information, please contact sales. -: # **AISI 4135H Steel: Comprehensive Product Overview** ## **1. Introduction & Key Distinction** **AISI 4135H** is the **hardenability-band version** of the standard AISI 4135 alloy steel. The "H" suffix indicates that the steel is produced to specific **hardenability requirements** as defined by end-quench (Jominy) test standards, rather than just chemical composition ranges. This ensures more predictable and consistent through-hardening characteristics in heat-treated components, especially critical for parts with varying cross-sectional thicknesses. The primary advantage of 4135H over standard 4135 is **reduced performance variability** in final heat-treated parts, leading to improved reliability in demanding applications. ## **2. Chemical Composition** The chemical composition of 4135H is defined by **ranges and limits** that differ from standard 4135, specifically designed to achieve controlled hardenability. Key elements include: | Element | Composition Range (% by weight) | Role & Hardenability Impact | | :--- | :--- | :--- | | **Carbon (C)** | 0.33 - 0.38 | Primary hardening element. Controlled range ensures consistent strength after heat treatment. | | **Manganese (Mn)** | 0.70 - 1.00 | Enhances hardenability and strength. Range is slightly wider than standard 4135 to allow for hardenability tuning. | | **Phosphorus (P)** | ≤ 0.030 | Impurity (kept very low). | | **Sulfur (S)** | ≤ 0.030 | Impurity (kept very low). Often controlled for improved transverse properties. | | **Silicon (Si)** | 0.15 - 0.35 | Deoxidizer, provides solid solution strengthening. | | **Chromium (Cr)** | 0.80 - 1.10 | Increases hardenability, wear, and tempering resistance. Key element for hardenability control. | | **Molybdenum (Mo)** | 0.15 - 0.25 | Enhances hardenability, reduces temper embrittlement, improves high-temperature strength. | *Note: The actual melt chemistry is tightly controlled by the producer to ensure the resulting hardenability bands (typically H-band or narrower JH-bands) are consistently met.* ## **3. Hardenability Data (Core Feature)** The defining characteristic of 4135H is its guaranteed hardenability band per **SAE J1268** and **ASTM A304**. The hardenability is expressed as a range of Rockwell C (HRC) values at specific distances from the quenched end in the Jominy end-quench test. **Typical Hardenability Band (SAE J1268):** | Distance from Quenched End (1/16 in.) | Hardness Range (HRC), Min - Max | | :--- | :--- | | J1.5 (1.5/16") | 50 - 57 | | J4 | 45 - 54 | | J7 | 38 - 49 | | J10 | 33 - 44 | | J14 | 28 - 39 | | J20 | 24 - 35 | | J30 | 20 - 31 | | J40 | 18 - 28 | *This predictability allows designers to select a steel that will achieve the desired microstructure (e.g., >90% martensite) at the core of a specific part thickness when quenched under defined conditions.* ## **4. Physical & Mechanical Properties** Physical properties are similar to standard 4135, but mechanical properties in the heat-treated condition are more consistent due to hardenability control. * **Physical Properties:** * Density: 7.85 g/cm³ (0.284 lb/in³) * Melting Point: ~1420-1460°C (2590-2660°F) * Modulus of Elasticity: 190-205 GPa (29,000-29,700 ksi) * Thermal Conductivity: ~42.6 W/m·K (at 100°C) * Coefficient of Thermal Expansion: 12.2 µm/m·°C (20-100°C) * **Achievable Mechanical Properties (After Quench & Temper):** * **Tensile Strength:** 860 - 1030 MPa (125,000 - 150,000 psi) * **Yield Strength (0.2% Offset):** 690 - 860 MPa (100,000 - 125,000 psi) * **Elongation (in 50mm):** 17% - 22% * **Reduction of Area:** 50% - 65% * **Hardness (Brinell):** 255 - 311 HB (typical for Q&T condition) * **Charpy V-Notch Impact:** 35 - 60 J (26 - 44 ft-lb) at room temperature. ## **5. Product Applications** 4135H is specified for **critical, high-stress components** where consistent through-hardening and mechanical properties are non-negotiable for performance and safety. * **Automotive & Trucking:** **High-stress drivetrain components** such as axle shafts, transmission shafts, crankshafts, connecting rods, and wheel hubs. The "H"-grade is essential for parts with large diameter variations. * **Off-Highway & Heavy Equipment:** Gears, pinions, track rollers, and final drive components in construction and agricultural machinery. * **Oil & Gas Industry:** **Drill collars, tool joints, mandrels**, and other downhole tools where uniform strength and toughness across thick sections prevent failure under cyclic loads. * **Aerospace:** Critical non-flight-control structural components, landing gear parts (secondary), and engine mounts requiring certified material consistency. * **Power Transmission:** **Heavy-duty gears and shafts** used in wind turbine gearboxes, industrial reducers, and marine propulsion systems. ## **6. International Standards & Equivalent Grades** | Standard / Country | Designation | Note / Status | | :--- | :--- | :--- | | **AISI / SAE (USA)** | **4135H** | The primary standard. Governed by SAE J1268 (H-band specs). | | **ASTM (USA)** | **A304 (Grade 4135H)** | Standard specification for steel bars, alloy, subject to end-quench hardenability requirements. | | **UNS** | **H41350** | Unified Numbering System for hardenability steel. | | **DIN / EN (Germany/EU)** | **34CrMo4H (1.7220+H)** | The "+H" denotes hardenability-controlled version of 34CrMo4. | | **JIS (Japan)** | **SCM435H** | The common Japanese equivalent hardenability grade. | | **GB (China)** | **35CrMoH** | The Chinese equivalent hardenability grade. | | **ISO** | **ISO 683-18: Type 34CrMo4** | Can be supplied to hardenability requirements per agreement. | ## **7. Heat Treatment & Processing** * **Forging:** Heat to 1150-1200°C (2100-2200°F). Do not forge below 850°C (1560°F). * **Annealing:** Heat to ~845°C (1555°F), slow furnace cool. Performed for machinability. * **Normalizing:** Heat to 870-900°C (1600-1650°F), air cool. Refines grain structure. * **Quenching & Tempering (Typical):** * **Preheat:** 650-700°C (1200-1290°F) to reduce thermal stress. * **Austenitize:** 850-870°C (1560-1600°F), hold for sufficient time. * **Quench:** **Oil quench** is standard for sections up to ~75mm (3 inches). Faster quenchant (e.g., polymer) may be used for larger sections. * **Temper:** Immediately after quenching. Typical range: **540-660°C (1000-1220°F)** to achieve desired strength-toughness balance. Higher tempering temperature → higher toughness, lower strength. ## **8. Conclusion** **AISI 4135H steel** is the **premium, reliability-focused variant** of 4135 alloy steel. By guaranteeing hardenability within specified bands, it provides engineers and manufacturers with a predictable material that delivers **uniform strength and toughness throughout the cross-section of heat-treated parts**. This makes it the **material of choice for critical, safety-related rotating and structural components** across automotive, energy, and heavy machinery sectors, where component failure is not an option. When specifying 4135H, the hardenability band report (H-band or JH-band) is a critical part of the material certification. -:- For detailed product information, please contact sales. -: AISI 4135H Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6202 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 Foil -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 4135H Steel Foil -:- For detailed product information, please contact sales. -:

Packing of AISI 4135H Steel Foil/Strip -:- 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 Foil/Strip 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 2673 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