ASTM A229 Oil-tempered Steel Wire, Class II

ASTM A229 Oil-tempered Steel Wire Wire, Class II Product Information -:- For detailed product information, please contact sales. -: ASTM A229 Oil-tempered Steel Wire Wire, Class II Synonyms -:- For detailed product information, please contact sales. -:

ASTM A229 Oil-tempered Steel Wire, Class II Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A229 Oil-tempered Steel Wire, Class II** **ASTM A229 Class II** is a premium oil-tempered carbon steel wire designed for high-performance mechanical spring applications requiring superior quality and precision. This class offers enhanced dimensional tolerances and improved consistency compared to Class I, making it suitable for critical spring applications where reliability and precision are paramount. --- #### **1. International Standards & Classification** **Primary Standard:** **ASTM A229/A229M** - "Standard Specification for Steel Wire, Oil-Tempered for Mechanical Springs" **Classification:** - **Class II** - Special quality oil-tempered steel spring wire - **Class I** - Standard quality grade **International Equivalents:** - **EN 10270-2**: FD (Oil Hardened and Tempered) grade - **JIS G 3560**: SWO-B - **GB/T 4358**: Class II - **ISO 8458-3**: Type B --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A229 Class II: | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.55-0.65 | | Manganese (Mn) | 0.50-0.90 | | Phosphorus (P) | 0.020 | | Sulfur (S) | 0.020 | | Silicon (Si) | 0.15-0.35 | **Key Composition Features:** - **Controlled Carbon**: 0.55-0.65% optimized for strength and fatigue resistance - **Tighter Impurity Control**: Phosphorus and sulfur limited to 0.020% - **Manganese Optimization**: 0.50-0.90% for consistent hardenability - **Silicon Precision**: 0.15-0.35% for uniform strengthening --- #### **3. Physical & Mechanical Properties** **Mechanical Properties (Enhanced Specifications):** | Wire Diameter (mm) | Tensile Strength (MPa) | Torsion Tests (min. twists) | |---|---|---| | 0.50-1.00 | 1750-2050 | 20-24 | | 1.01-2.00 | 1700-2000 | 18-22 | | 2.01-3.00 | 1650-1950 | 16-20 | | 3.01-4.00 | 1600-1900 | 14-18 | | 4.01-5.00 | 1550-1850 | 12-16 | **Enhanced Physical Properties:** - **Density**: 7.85 g/cm³ (0.284 lb/in³) - **Modulus of Elasticity**: 200 GPa (29,000 ksi) - **Shear Modulus**: 77 GPa (11,200 ksi) - **Fatigue Strength**: Superior cyclic loading performance - **Thermal Stability**: Maintains properties up to 180°C (356°F) --- #### **4. Product Applications** **High-Precision Spring Manufacturing:** - Precision automotive valve springs - Critical suspension components - High-performance extension springs - Precision instrument springs **Critical Industrial Applications:** - Engine valve springs for automotive and aerospace - Precision clutch mechanisms - High-speed machinery springs - Critical safety component springs **Transportation and Aerospace:** - Aircraft control system springs - High-performance automotive springs - Racing suspension components - Critical transportation equipment springs **Specialized Applications:** - Medical device springs - Precision measuring instrument springs - High-reliability mechanical systems - Critical industrial automation components --- #### **5. Fabrication Characteristics** **Enhanced Forming Performance:** - **Superior Cold Formability**: Excellent for precision coiling operations - **Predictable Springback**: Tight control for high-precision forming - **Winding Consistency**: Ideal for automated precision coiling equipment - **Surface Integrity**: Higher quality surface requirements **Advanced Heat Treatment:** - **Controlled Oil Tempering**: Uniform microstructure throughout - **Enhanced Temper Resistance**: Suitable for elevated temperature applications - **Stress Relief Optimization**: Improved dimensional stability - **Consistent Hardness**: Tight hardness range control **Premium Surface Quality:** - **Enhanced Surface Finish**: Superior to Class I requirements - **Strict Decarburization Limits**: Minimal allowed surface decarburization - **Dimensional Precision**: Tighter diameter tolerances - **Surface Defect Control**: Strict limitations on surface imperfections **Rigorous Quality Assurance:** - **Enhanced Testing Frequency**: More extensive mechanical testing - **Precision Dimensional Verification**: Tighter tolerance requirements - **Comprehensive Surface Analysis**: Advanced surface quality checks - **Batch Consistency Monitoring**: Superior lot-to-lot uniformity control --- ### **Technical Summary** ASTM A229 Class II represents the premium grade of oil-tempered steel wire, offering enhanced performance characteristics for critical spring applications. The tighter chemical controls, particularly the reduced phosphorus and sulfur limits, combined with more stringent manufacturing processes, result in wire that delivers exceptional consistency and reliability in high-performance spring applications. This class's superior dimensional tolerances and enhanced mechanical properties make it indispensable for applications where spring performance predictability and manufacturing precision are critical. The improved fatigue resistance and thermal stability compared to Class I provide additional safety margins for demanding applications in automotive, aerospace, and industrial sectors. The wire's excellent formability and predictable behavior during precision coiling operations, combined with the consistent oil-tempered microstructure, ensure reliable performance in the most demanding spring applications. The enhanced quality control measures and stricter inspection criteria guarantee superior batch-to-batch consistency, making ASTM A229 Class II the preferred choice for manufacturers of high-reliability spring components where failure is not an option. -:- For detailed product information, please contact sales. -: ASTM A229 Oil-tempered Steel Wire, Class II Specification Dimensions Size： Diameter 20-1000 mm Length <4348 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. -: ASTM A229 Oil-tempered Steel Wire, Class II Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A229 Oil-tempered Steel Wire Wire, Class II -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A229 Oil-tempered Steel Wire Wire, Class II -:- For detailed product information, please contact sales. -:

Packing of ASTM A229 Oil-tempered Steel Wire Wire, Class II -:- 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 Wire 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 819 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