ASTM A227 Steel Rod/Bar, Class II

ASTM A227 Steel Rod Wire, Class II Product Information -:- For detailed product information, please contact sales. -: ASTM A227 Steel Rod Wire, Class II Synonyms -:- For detailed product information, please contact sales. -:

ASTM A227 Steel Wire, Class II Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A227 Class II Steel Wire** **ASTM A227 Class II** is a cold-drawn carbon steel wire classified as special quality within the A227 specification, offering closer dimensional tolerances and more consistent mechanical properties compared to Class I. This class is designed for mechanical spring applications requiring higher precision and reliability. --- #### **1. International Standards & Classification** **Primary Standard:** **ASTM A227/A227M** - "Standard Specification for Steel Wire, Cold-Drawn for Mechanical Springs" **Classification:** - **Class II** - Special quality with closer dimensional tolerances - **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 A227 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 properties - **Tighter Impurity Control**: Lower phosphorus and sulfur limits - **Controlled Manganese**: Ensures consistent hardenability - **Silicon Range**: Provides uniform strengthening --- #### **3. Physical & Mechanical Properties** **Mechanical Properties (Typical for various diameters):** | 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 | **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) - **Thermal Conductivity**: 49.5 W/m·K - **Coefficient of Thermal Expansion**: 11.5 × 10⁻⁶/°C --- #### **4. Product Applications** **Precision Spring Manufacturing:** - High-precision compression springs - Critical extension springs - Precision torsion springs - Instrument springs **Industrial Applications:** - Precision mechanical seals - Critical valve springs - Electrical relay springs - Precision mechanism springs **Automotive Applications:** - Fuel injection springs - Transmission control springs - Precision valve mechanisms - Safety-critical automotive springs **Consumer Products:** - Precision instrument springs - High-quality lock mechanisms - Precision timer springs - Quality appliance components --- #### **5. Fabrication Characteristics** **Forming Performance:** - **Excellent Formability**: Consistent performance in coiling operations - **Predictable Springback**: Tight tolerances for precise forming - **Surface Quality**: Superior surface finish requirements - **Winding Consistency**: Excellent for high-speed automatic coiling **Heat Treatment Considerations:** - **Stress Relieving**: Essential after forming (250-300°C) - **Thermal Stability**: Maintains properties up to 120°C (250°F) - **Processing Consistency**: Uniform response to thermal treatments **Surface and Dimensional Requirements:** - **Tighter Tolerances**: Closer diameter control than Class I - **Superior Surface Finish**: Reduced surface defects - **Dimensional Consistency**: Better straightness and uniformity **Quality Assurance:** - **Enhanced Testing**: More frequent mechanical testing - **Strict Dimensional Control**: Tighter tolerance verification - **Comprehensive Inspection**: Extended surface quality checks - **Batch Consistency**: Improved lot-to-lot uniformity --- ### **Technical Summary** ASTM A227 Class II represents a premium grade of cold-drawn spring steel wire that offers enhanced dimensional consistency and improved mechanical properties compared to Class I. The tighter chemical controls and more stringent manufacturing processes result in wire that exhibits superior performance in precision spring applications. The class's closer dimensional tolerances and more consistent mechanical properties make it particularly valuable for applications where spring performance predictability and manufacturing reliability are critical. The enhanced quality control measures ensure better batch-to-batch consistency, reducing variability in spring production. While maintaining the same fundamental chemical composition as Class I, Class II's improved processing controls and stricter quality standards make it the preferred choice for precision spring manufacturers requiring higher levels of consistency and reliability. The wire's excellent formability and predictable behavior during spring coiling operations contribute to improved manufacturing efficiency and reduced rejection rates. ASTM A227 Class II has established itself as a reliable material for critical spring applications across various industries, particularly where consistent performance, precise dimensions, and reliable mechanical properties are essential requirements for successful spring operation in demanding applications. -:- For detailed product information, please contact sales. -: ASTM A227 Steel Wire, Class II Specification Dimensions Size： Diameter 20-1000 mm Length <4344 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 A227 Steel Wire, Class II Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A227 Steel Rod Wire, Class II -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A227 Steel Rod Wire, Class II -:- For detailed product information, please contact sales. -:

Packing of ASTM A227 Steel Rod 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 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 815 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