AISI 50B60H Steel

AISI 50B60H Steel Product Information -:- For detailed product information, please contact sales. -: AISI 50B60H Steel Synonyms -:- For detailed product information, please contact sales. -:

AISI 50B60H Steel Product Information -:- For detailed product information, please contact sales. -: # **AISI 50B60H Boron Steel - Technical Data Sheet** ## **1. Product Overview** **AISI 50B60H** is a medium-high carbon, boron-treated alloy steel specifically manufactured with **guaranteed hardenability bands** (designated by the "H" suffix). This steel provides exceptional hardenability through minimal boron additions, making it a cost-effective alternative to traditional alloy steels for applications requiring deep hardening characteristics and consistent mechanical properties. The "H" designation ensures that each heat of steel meets **strict hardenability limits** as defined by SAE J1268, providing engineers with predictable hardening behavior for critical components. This material is particularly valued for heavy-duty applications where section size variations demand uniform hardening response. --- ## **2. Chemical Composition** ### **Standard Composition Ranges (SAE J404/J412):** | Element | Composition Range (%) | Function & Significance | |---------|----------------------|-------------------------| | **Carbon (C)** | 0.56 - 0.64 | Primary hardening element; determines maximum achievable hardness and strength | | **Manganese (Mn)** | 0.75 - 1.00 | Enhances hardenability, strength, and response to heat treatment | | **Phosphorus (P)** | ≤ 0.035 | Residual impurity; minimized for improved toughness | | **Sulfur (S)** | 0.040 - 0.070 | Added to improve machinability; forms manganese sulfides | | **Silicon (Si)** | 0.15 - 0.35 | Deoxidizer; provides solid solution strengthening | | **Boron (B)** | 0.0005 - 0.003 | **Critical element**; dramatically improves hardenability efficiency | | **Iron (Fe)** | Balance | Base matrix | ### **H-Grade Special Requirements:** - **Composition control**: Tighter than standard grades to ensure consistent hardenability - **Boron protection**: Typically contains small amounts of titanium or aluminum to prevent boron nitride formation - **Guaranteed hardenability**: Each heat must fall within specified Jominy curve bands --- ## **3. Physical & Mechanical Properties** ### **As-Supplied Condition (Annealed):** - **Hardness**: 192-229 BHN - **Tensile Strength**: 620-795 MPa (90-115 ksi) - **Yield Strength**: 380-550 MPa (55-80 ksi) - **Elongation**: 18-22% (in 2 inches) - **Reduction of Area**: 40-50% - **Machinability**: 65-70% (relative to 1212 steel = 100%) ### **Hardenability Bands (SAE J1268):** | Distance from Quenched End | Minimum Rockwell C | Maximum Rockwell C | |----------------------------|-------------------|-------------------| | 1/16 inch (J1) | 57 | 65 | | 1/8 inch (J2) | 56 | 64 | | 1/4 inch (J4) | 54 | 62 | | 1/2 inch (J8) | 48 | 58 | | 1 inch (J16) | 38 | 52 | | 2 inches (J32) | 28 | 44 | ### **Heat Treated Properties:** *Typical Heat Treatment Cycle:* - **Austenitizing**: 830-850°C (1525-1560°F) - **Quenching**: Oil, good agitation - **Tempering**: 425-650°C (800-1200°F) depending on required hardness **Mechanical Properties After Heat Treatment:** | Tempering Temperature | Hardness (HRC) | Tensile Strength | Yield Strength | Charpy V-Notch Impact | |----------------------|----------------|------------------|----------------|-----------------------| | 205°C (400°F) | 55-60 | 1860-2070 MPa | 1650-1860 MPa | 15-25 J | | 425°C (800°F) | 45-50 | 1480-1650 MPa | 1310-1480 MPa | 35-45 J | | 540°C (1000°F) | 38-42 | 1170-1310 MPa | 1030-1170 MPa | 50-60 J | | 650°C (1200°F) | 30-34 | 900-1030 MPa | 790-900 MPa | 70-80 J | --- ## **4. Product Applications** ### **Primary Application Areas:** **Heavy-Duty Automotive Components:** - **Commercial vehicle axle shafts** (primary application) - **Heavy truck transmission shafts** and gears - **Steering components**: Drag links, tie rods, pitman arms - **Drivetrain parts**: Propeller shafts, universal joint yokes - **Suspension components**: Torsion bars for heavy vehicles **Industrial & Agricultural Machinery:** - **High-stress gears** for industrial gearboxes - **Heavy-duty shafts** and spindles in manufacturing equipment - **Agricultural tractor components**: PTO shafts, final drive gears - **Forged connecting rods** for large engines **Construction & Mining Equipment:** - **Excavator undercarriage components** - **Drill rod assemblies** for mining applications - **Crane boom sections** and sheave pins - **Heavy-duty fasteners** (Grade 12.9 equivalent) **Specialized Applications:** - **Military vehicle components** - **Oil field equipment parts** - **Heavy press components** - **High-stress tooling applications** --- ## **5. International Standards & Equivalents** ### **Primary Specifications:** | Standard | Designation | Governing Specification | |----------|-------------|-------------------------| | **SAE/AISI** | **50B60H** | SAE J404, J412, J1268 | | **ASTM** | - | A304 (Standard for H-Steels) | | **UNS** | G50601 | Unified Numbering System | ### **Global Equivalent Grades:** | Country/Region | Standard | Equivalent Grade | Notes | |----------------|----------|-----------------|-------| | **Germany** | DIN 17211 | **50B60H** | Direct equivalent | | **Europe (EN)** | EN 10083-3 | **1.5534H** | European designation | | **Japan** | JIS G4052 | **SB56H** | Similar hardenability grade | | **China** | GB/T 5216 | **60MnBH** | Chinese equivalent | | **International** | ISO 683-1 | **Type 1.5534** | International standard | ### **Related Processing Standards:** - **Heat Treatment**: AMS 2759, ASTM A29 - **Forging Practice**: ASTM A788 - **Bars & Billets**: ASTM A304, A322 - **Quality Testing**: ASTM A255 (Jominy Test Method) --- ## **6. Technical Advantages & Design Considerations** ### **Key Advantages:** ✅ **Predictable hardenability** across production lots ✅ **Deep hardening characteristics** suitable for large sections ✅ **Cost-effective** alternative to Cr-Mo/Ni-Cr alloy steels ✅ **Good combination** of strength and toughness after tempering ✅ **Consistent performance** in heat treatment ✅ **Good machinability** in annealed condition ### **Design & Processing Considerations:** ⚠️ **Section size limitations**: Maximum effective hardening depth ~75-100 mm in oil ⚠️ **Temper embrittlement susceptibility**: Rapid cooling recommended through 350-575°C range ⚠️ **Decarburization sensitivity**: Protective atmosphere required during heat treatment ⚠️ **Welding not recommended** without specialized procedures ⚠️ **Transverse properties** may be lower than longitudinal properties ### **Quality Assurance Features:** - Each heat lot certified to hardenability bands - Full traceability to melt practice - Consistent response to heat treatment - Predictable distortion characteristics during quenching --- **Technical Note**: The "H" designation in 50B60H provides engineers with reliable data for designing components with specific hardness gradients, ensuring consistent performance in safety-critical applications where predictable material behavior is essential. **Revision**: 1.1 **Date**: October 2023 **Disclaimer**: Properties listed are typical values. Actual performance depends on specific manufacturing processes, heat treatment parameters, and component design. Always consult with material engineers for critical applications. -:- For detailed product information, please contact sales. -: AISI 50B60H Steel Specification Dimensions Size： Diameter 20-1000 mm Length <4105 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 50B60H Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 50B60H Steel -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 50B60H Steel -:- For detailed product information, please contact sales. -:

Packing of AISI 50B60H Steel -:- 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 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 576 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