Spherical ASTM A229 Oil-tempered Steel Powder, Class II

ASTM A229 Oil-tempered Steel Spherical Powder Wire, Class II Product Information -:- For detailed product information, please contact sales. -: ASTM A229 Oil-tempered Steel Spherical Powder Wire, Class II Synonyms -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Spherical ASTM A229 Oil-tempered Steel Powder, Class II characteristics -:- For detailed product information, please contact sales. -: Spherical ASTM A229 Oil-tempered Steel Powder, Class II Particle Size -:- For detailed product information, please contact sales. -: -:- -:- 0-15μm ,5-25μm, 15-45μm, 15-53μm,20-63um, 45-75μm, 45-105μm, 45-150μm ,75-150μm. (Various granularities can be customized according to customer requirements) -:- For detailed product information, please contact sales. -:

Spherical ASTM A229 Oil-tempered Steel Powder, Class II Applicable processes -:- For detailed product information, please contact sales. -: Laser/electron beam additive manufacturing (SLM/EBM, 3D printing) Direct laser deposition (DLD) Used in thermal spray (TSA) Powder hot isostatic pressing (HIP) Metal injection molding (MIM) Powder metallurgy (PM) Laser cladding (LC), etc. -:- For detailed product information, please contact sales. -: Spherical ASTM A229 Oil-tempered Steel Powder, Class II Chemical Composition -:- For detailed product information, please contact sales. -: -:- 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 Datasheet: ASTM A229 Oil-Tempered Steel Wire, Class II** ## **1. Product Overview** **ASTM A229 Class II** is a premium-grade **oil-tempered high-carbon steel wire** engineered for demanding mechanical spring applications requiring superior performance characteristics. As the enhanced grade within the A229 specification, Class II wire undergoes optimized heat treatment and processing to deliver **higher tensile strength, improved fatigue resistance, and enhanced dimensional stability** compared to standard Class I material. This wire represents the advanced tier of oil-tempered spring wire technology, providing engineers with a robust material solution for applications where increased load capacity, extended service life, and reliable performance under dynamic loading conditions are paramount. ## **2. International Standards & Designations** | System/Authority | Designation | Specification Title / Relationship | | :--- | :--- | :--- | | **ASTM International** | **ASTM A229/A229M** | Standard Specification for Steel Wire, Oil-Tempered for Mechanical Springs | | **Grade** | **Class II** | Enhanced Property Grade | | **SAE** | **SAE J217** | Oil-Tempered Spring Wire (includes multiple classes) | | **ISO** | **ISO 8458-2** | Mechanical springs - Steel spring wire - Part 2: Oil hardened and tempered spring wire | | **EN (Europe)** | **EN 10270-2** | Steel wire for mechanical springs - Part 2: Oil hardened and tempered steel wire (Type FDS) | | **JIS (Japan)** | **JIS G 3560** | Oil Tempered Steel Wire for Springs (SWO-C) | | **DIN (Germany)** | **DIN 17224** | Oil-hardened and tempered round steel spring wire - Quality grade B | | **Industry Terminology** | Premium OT Wire, High-Performance Oil-Tempered, Class II OT | ## **3. Chemical Composition (% by Weight)** Class II utilizes refined chemistry and tighter control to achieve its enhanced mechanical properties while maintaining excellent processability. | Element | ASTM A229 Class II Requirements | Typical % Range | | :--- | :--- | :--- | | **Carbon (C)** | **0.58 - 0.68** | 0.60 - 0.65 | | **Manganese (Mn)** | **0.60 - 0.95** | 0.75 - 0.90 | | **Phosphorus (P)** | **≤ 0.030** | ≤ 0.025 | | **Sulfur (S)** | **≤ 0.035** | ≤ 0.025 | | **Silicon (Si)** | **0.15 - 0.35** | 0.20 - 0.30 | | **Microalloying Elements** | Optional for grain refinement | V ≤ 0.05%, Nb ≤ 0.03% | | **Residual Elements** | Tightly controlled | Cu ≤ 0.20%, Ni ≤ 0.25%, Cr ≤ 0.20% | | **Iron (Fe)** | Balance | Balance | **Advanced Manufacturing Process:** Production involves precise control at every stage: 1. **Steelmaking:** Electric arc furnace refining with ladle metallurgy for cleanliness 2. **Hot Rolling:** Controlled thermo-mechanical processing 3. **Patenting:** Optimized isothermal transformation to fine pearlite 4. **Intermediate Drawing:** Controlled reduction 5. **Heat Treatment:** **Advanced oil-tempering** with precise temperature control (±5°C) 6. **Final Sizing:** Precision drawing to exact dimensions 7. **Stress Equalizing:** Thermal treatment for dimensional stability ## **4. Mechanical & Physical Properties** Class II delivers consistently higher mechanical properties across all diameter ranges compared to Class I. | Property | ASTM A229 Class II Specifications | Test Standard | Technical Notes | | :--- | :--- | :--- | :--- | | **Condition** | **Premium Oil-Tempered** | -- | Optimized tempered martensite structure | | **Tensile Strength** | **Enhanced Diameter-Dependent Values:**
• 0.5 mm: 1950-2200 MPa (283-319 ksi)
• 2.0 mm: 1650-1850 MPa (239-268 ksi)
• 4.0 mm: 1500-1650 MPa (218-239 ksi)
• 6.0 mm: 1400-1550 MPa (203-225 ksi) | ASTM A370 / E8 | **8-12% higher than Class I** for equivalent diameters | | **Yield Strength (0.2%)** | Typically 88-92% of tensile strength | ASTM A370 | Excellent resistance to permanent set | | **Torsion Performance** | Minimum twists: 20-40% higher than Class I requirements | ASTM A938 | Superior ductility and internal quality | | **Wrapping Test** | Must wrap around mandrel equal to wire diameter | Practical Test | Exceptional formability despite higher strength | | **Surface Quality** | Superior finish, controlled oxide scale (Ra ≤ 1.2 μm) | ISO 21920-2 | Optional bright finish available | | **Dimensional Tolerance** | Tighter than Class I (±0.02mm for d ≤ 3mm) | ASTM A229 | Enhanced precision for critical applications | | **Modulus of Elasticity (E)** | 200-205 GPa | -- | Consistent for spring design | | **Shear Modulus (G)** | 77-80 GPa | -- | | | **Fatigue Strength (10⁷ cycles)** | 50-55% of tensile strength | Rotating beam test | Superior to Class I | | **Relaxation Resistance** | <3% load loss after 24h at 75% of yield stress | ASTM E328 | Excellent for long-term static loads | ## **5. Key Characteristics & Advantages** * **Enhanced Strength Profile:** Higher tensile and yield strengths enable more compact spring designs or increased load capacity * **Superior Fatigue Performance:** Optimized microstructure provides extended service life under dynamic loading conditions * **Exceptional Formability:** Maintains excellent coiling and bending characteristics despite increased strength * **Improved Dimensional Consistency:** Tighter tolerances and better straightness for precision manufacturing * **Reduced Property Variation:** Narrower property bands ensure predictable spring performance * **Enhanced Surface Integrity:** Controlled surface condition minimizes stress concentrators * **Better Stress Relaxation Resistance:** Superior performance in static load applications * **Consistent Batch-to-Batch Quality:** Advanced process controls ensure reliable material properties ## **6. Primary Applications** Class II wire is specified for demanding applications where performance, reliability, and longevity are critical. * **Automotive Safety Systems:** Seat belt retractor springs, airbag component springs, brake system springs * **High-Performance Suspension:** Premium vehicle suspension springs, heavy-duty truck suspension components * **Industrial Machinery:** High-cycle valve springs, precision actuator springs, robotic component springs * **Aerospace Components:** Non-critical flight control springs, landing gear auxiliary springs, instrumentation springs * **Medical Devices:** Surgical instrument springs, diagnostic equipment components * **Power Tools:** High-cycle impact wrench springs, precision drill mechanisms * **Agricultural Equipment:** Heavy-duty implement springs, high-cycle hydraulic valve springs * **Energy Sector:** Valve springs for pumps and compressors, control mechanism springs ## **7. Processing & Fabrication Guidelines** * **Spring Manufacturing:** - **Coiling:** Excellent for automated coiling; reduced springback compared to Class I - **Stress Relieving:** Recommended at 230-260°C for 20-40 minutes for precision applications - **Shot Peening:** Particularly effective for enhancing fatigue life of Class II springs - **Setting:** Can be pre-stressed to higher levels than Class I material * **Surface Treatment:** - **Plating:** Excellent substrate for zinc, cadmium, or nickel plating - **Baking Requirements:** 200-220°C for 2-6 hours post-plating (depending on thickness) - **Alternative Coatings:** Phosphate, oxide, or polymer coatings perform exceptionally well - **Special Finishes:** Can be supplied with proprietary corrosion-resistant coatings * **Quality Control in Manufacturing:** - **100% Dimensional Verification** recommended for critical applications - **Statistical Process Control** for coiling parameters - **Spring Testing:** Load testing at 1.3× design load for safety-critical applications - **Fatigue Testing:** Sample testing recommended for high-cycle applications ## **8. Performance Comparison** | Parameter | Class I | **Class II** | Hard-Drawn A227 Class II | | :--- | :--- | :--- | :--- | | **Tensile Strength (2mm)** | 1550-1750 MPa | **1650-1850 MPa** | 1950-2150 MPa | | **Fatigue Limit Ratio** | 45-50% | **50-55%** | 35-40% | | **Formability Index** | 100% | 95-98% | 70-75% | | **Cost Premium** | Baseline | 15-25% | -10% to +5% | | **Optimal Spring Index** | 4-12 | **4-10** | 6-15 | | **Hydrogen Embrittlement Risk** | Low-Moderate | **Low** | High | ## **9. Quality Assurance & Certification** Class II wire is supplied with comprehensive quality documentation: * **EN 10204 3.1 Certificate** with full traceability * **Extended Chemical Analysis** including trace elements * **Complete Mechanical Test Suite** for each production lot * **Metallographic Report** showing microstructure * **Surface Quality Certification** * **Statistical Analysis** of key properties * **Heat Treatment Records** with temperature-time profiles * **Non-Destructive Testing Results** (optional) ## **10. Technical Specifications & Limitations** * **Temperature Limitations:** Maximum continuous service: 180°C (356°F) * **Corrosion Resistance:** Requires protection for outdoor or corrosive environments * **Minimum Bend Radius:** 2× wire diameter for 90° bends * **Storage Conditions:** Dry environment, relative humidity <65% * **Shelf Life:** 18 months in original packaging for critical applications * **Re-work Limitations:** Limited capacity for re-heat treatment --- **Disclaimer:** This technical datasheet provides reference information for ASTM A229 Class II oil-tempered steel wire. Final design and specification must be based on the complete requirements of the latest edition of **ASTM A229/A229M**. Mechanical properties are diameter-dependent, and designers must consult the standard's tables for specific values. For safety-critical applications, prototype testing and validation under simulated service conditions are essential. Consultation with certified spring engineers is strongly recommended before final material selection. Performance claims are based on typical laboratory test conditions and may vary in specific applications. -:- For detailed product information, please contact sales. -: ASTM A229 Oil-tempered Steel Wire, Class II Specification Dimensions Size： Diameter 20-1000 mm Length <6414 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. -:

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

Packing of ASTM A229 Oil-tempered Steel Spherical Powder 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 Spherical Powder 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 2885 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