ASTM A227M Steel Wire, Class II

ASTM A227M Steel Wire Wire, Class II Product Information -:- For detailed product information, please contact sales. -: ASTM A227M Steel Wire Wire, Class II Synonyms -:- For detailed product information, please contact sales. -:

ASTM A227M Steel Wire, Class II Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A227M Steel Wire, Class II** **ASTM A227M Class II** is a metric specification for cold-drawn carbon steel wire classified as special quality, offering enhanced dimensional precision and consistent mechanical properties for demanding mechanical spring applications. This class provides superior performance characteristics compared to Class I, making it suitable for precision spring manufacturing in metric dimensions. --- #### **1. International Standards & Classification** **Primary Standard:** **ASTM A227M** - "Standard Specification for Steel Wire, Cold-Drawn for Mechanical Springs [Metric]" **Classification:** - **Class II** - Special quality with closer dimensional tolerances (metric) - **Class I** - Standard quality grade **International Equivalents:** - **EN 10270-1**: SH (Spring Hardened) grade - **JIS G 3521**: SWP-B - **GB/T 4357**: Grade C - **ISO 8458-2**: Class B --- #### **2. Chemical Composition** The chemical composition requirements for ASTM A227M Class II: | Element | Composition (Maximum %) | |---|---| | Carbon (C) | 0.85-0.95 | | Manganese (Mn) | 0.30-0.60 | | Phosphorus (P) | 0.020 | | Sulfur (S) | 0.020 | | Silicon (Si) | 0.10-0.30 | **Key Composition Features:** - **High Carbon Content**: 0.85-0.95% for optimal spring characteristics - **Enhanced Purity**: Reduced phosphorus and sulfur limits (0.020% max) - **Controlled Manganese**: Ensures consistent hardenability - **Silicon Optimization**: Provides uniform solid solution strengthening --- #### **3. Physical & Mechanical Properties** **Mechanical Properties (Metric Specifications):** | Wire Diameter (mm) | Tensile Strength (MPa) | Torsion Tests (min. twists) | |---|---|---| | 0.50-1.00 | 1900-2200 | 22-27 | | 1.01-2.00 | 1800-2100 | 20-24 | | 2.01-3.00 | 1700-2000 | 18-22 | | 3.01-4.00 | 1600-1900 | 16-20 | | 4.01-5.00 | 1500-1800 | 14-18 | **Physical Properties:** - **Density**: 7.85 g/cm³ - **Modulus of Elasticity**: 200 GPa - **Shear Modulus**: 77 GPa - **Thermal Conductivity**: 49.5 W/m·K - **Coefficient of Thermal Expansion**: 11.5 × 10⁻⁶/°C --- #### **4. Product Applications** **Precision Spring Manufacturing:** - High-precision metric compression springs - Critical extension springs - Precision torsion springs - Instrument-grade springs **Industrial Applications:** - Precision mechanical seals - Critical valve mechanisms - Electrical relay springs - Precision measurement instruments **Automotive Sector:** - Fuel injection system springs - Transmission control springs - Precision valve train components - Safety-critical automotive mechanisms **Consumer and Electronics:** - Precision timer mechanisms - High-quality lock systems - Electronic device components - Precision appliance mechanisms --- #### **5. Fabrication Characteristics** **Forming Performance:** - **Excellent Formability**: Superior consistency in coiling operations - **Predictable Springback**: Enhanced control for precision forming - **Surface Quality**: Higher standard surface finish requirements - **Manufacturing Consistency**: Excellent for high-precision automated coiling **Heat Treatment Considerations:** - **Stress Relieving**: Essential after forming (250-300°C) - **Thermal Stability**: Maintains properties up to 120°C - **Consistent Response**: Uniform thermal behavior **Surface and Dimensional Standards:** - **Tighter Tolerances**: Enhanced diameter control in metric dimensions - **Superior Surface Finish**: Strict surface defect limitations - **Dimensional Consistency**: Improved straightness and roundness **Quality Assurance:** - **Enhanced Testing Protocol**: More frequent mechanical testing - **Strict Dimensional Control**: Tighter metric tolerance verification - **Comprehensive Surface Inspection**: Extended quality checks - **Batch Consistency**: Superior lot-to-lot uniformity --- ### **Technical Summary** ASTM A227M Class II represents the premium metric grade of cold-drawn spring steel wire, offering enhanced dimensional precision and superior mechanical consistency compared to Class I. The tighter chemical controls, particularly the reduced phosphorus and sulfur limits, combined with more stringent manufacturing processes, result in wire that delivers exceptional performance in precision metric spring applications. This class's closer dimensional tolerances in metric specifications and more consistent mechanical properties make it indispensable for applications where spring performance predictability and manufacturing reliability are paramount. The enhanced quality control measures ensure superior batch-to-batch consistency, significantly reducing variability in precision spring production. While maintaining the fundamental high-carbon chemistry of the A227M specification, Class II's improved processing controls and stricter quality standards establish it as the preferred choice for manufacturers requiring higher levels of consistency and reliability in metric-based production. The wire's excellent formability and predictable behavior during precision coiling operations contribute to improved manufacturing efficiency and reduced rejection rates in high-volume production environments. ASTM A227M Class II has proven its reliability in critical spring applications across global industries, particularly where consistent performance, precise metric dimensions, and dependable mechanical properties are essential requirements for successful spring operation in demanding precision applications. -:- For detailed product information, please contact sales. -: ASTM A227M Steel Wire, Class II Specification Dimensions Size： Diameter 20-1000 mm Length <4346 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 A227M Steel Wire, Class II Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A227M Steel Wire Wire, Class II -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A227M Steel Wire Wire, Class II -:- For detailed product information, please contact sales. -:

Packing of ASTM A227M 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 817 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