Spherical ASTM A231 Alloy Steel Powder

ASTM A231 Alloy Steel Spherical Powder Wire Product Information -:- For detailed product information, please contact sales. -: ASTM A231 Alloy Steel Spherical Powder Wire Synonyms -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Spherical ASTM A231 Alloy Steel Powder characteristics -:- For detailed product information, please contact sales. -: Spherical ASTM A231 Alloy Steel Powder 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 A231 Alloy Steel Powder 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 A231 Alloy Steel Powder Chemical Composition -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: ASTM A231 Alloy Steel Wire Product Information -:- For detailed product information, please contact sales. -: # **Product Datasheet: ASTM A231 Alloy Steel Spring Wire** ## **1. Product Overview** **ASTM A231** is a **chromium-vanadium alloy steel wire** specifically engineered for high-performance mechanical spring applications requiring exceptional fatigue resistance, elevated temperature capability, and superior toughness. This wire combines the benefits of chromium's hardenability and corrosion resistance with vanadium's grain-refining and strengthening properties, creating a material capable of withstanding demanding dynamic loading conditions. Primarily supplied in the oil-tempered condition, ASTM A231 represents a premium class of spring wire designed for critical applications where standard carbon spring wires are inadequate. ## **2. International Standards & Designations** | System/Authority | Designation | Specification Title / Equivalent | | :--- | :--- | :--- | | **ASTM International** | **ASTM A231/A231M** | Standard Specification for Chromium-Vanadium Alloy Steel Spring Wire | | **SAE** | **SAE J217** | Chromium-Vanadium Alloy Spring Wire | | **UNS** | **H61500** | Unified Numbering System | | **ISO** | **ISO 8458-4** | Mechanical springs - Steel spring wire - Part 4: Stainless spring steel wire *(Note: Different alloy system)* | | **EN (Europe)** | **EN 10270-3** | Steel wire for mechanical springs - Part 3: Stainless spring steel wire *(Similar high-performance category)* | | **JIS (Japan)** | **JIS G 3566** | Chrome Vanadium Steel Wire for Valve Springs (SWOSC-V) | | **DIN (Germany)** | **DIN 17223-2** | Valve spring wire - Chrome-vanadium alloyed | | **Common Names** | Chrome-Vanadium Spring Wire, Cr-V Wire, Valve Spring Quality Wire | ## **3. Chemical Composition (% by Weight)** The chromium-vanadium alloy system provides unique performance characteristics through synergistic effects. | Element | ASTM A231 Requirements | Typical % Range | | :--- | :--- | :--- | | **Carbon (C)** | **0.48 - 0.53** | 0.49 - 0.51 | | **Manganese (Mn)** | **0.70 - 0.90** | 0.75 - 0.85 | | **Phosphorus (P)** | **≤ 0.025** | ≤ 0.020 | | **Sulfur (S)** | **≤ 0.025** | ≤ 0.015 | | **Silicon (Si)** | **0.20 - 0.35** | 0.25 - 0.30 | | **Chromium (Cr)** | **0.80 - 1.10** | 0.90 - 1.05 | | **Vanadium (V)** | **0.15 - 0.25** | 0.18 - 0.22 | | **Nickel (Ni)** | **≤ 0.40** | 0.20 - 0.30 | | **Copper (Cu)** | **≤ 0.35** | ≤ 0.20 | | **Molybdenum (Mo)** | **≤ 0.10** | ≤ 0.05 | | **Iron (Fe)** | Balance | Balance | **Manufacturing Process:** The wire undergoes a sophisticated production sequence: 1. **Melting:** Electric arc furnace or basic oxygen furnace refining 2. **Hot Rolling:** Controlled thermo-mechanical processing 3. **Patenting:** Isothermal transformation to fine pearlitic structure 4. **Cold Drawing:** Controlled reduction with intermediate annealing as needed 5. **Heat Treatment:** **Oil quenching and tempering** to achieve tempered martensite microstructure 6. **Final Processing:** Stress relieving and surface conditioning ## **4. Mechanical & Physical Properties** ASTM A231 wire is characterized by its excellent combination of strength and ductility. | Property | ASTM A231 Specifications | Test Standard | Technical Notes | | :--- | :--- | :--- | :--- | | **Condition** | **Oil-Tempered (Quenched & Tempered)** | -- | Fine-grained tempered martensite | | **Tensile Strength** | **Diameter-Dependent:**
• 1.0 mm: 1700-1900 MPa (247-276 ksi)
• 3.0 mm: 1500-1650 MPa (218-239 ksi)
• 5.0 mm: 1350-1500 MPa (196-218 ksi)
• 7.0 mm: 1250-1400 MPa (181-203 ksi) | ASTM A370 | Higher toughness at equivalent strength vs. carbon wires | | **Yield Strength (0.2%)** | Typically 85-90% of tensile | ASTM A370 | Excellent elastic recovery | | **Elongation** | 8-12% (in 10× diameter gauge) | ASTM A370 | Good ductility for forming | | **Reduction of Area** | 40-50% | ASTM A370 | Indicative of high toughness | | **Torsion Test** | Minimum 10-25 turns (diameter dependent) | ASTM A938 | Superior to carbon spring wires | | **Hardness** | 44-50 HRC (typical) | ASTM E18 | | | **Modulus of Elasticity** | **205-210 GPa (29,700-30,500 ksi)** | -- | Slightly higher than carbon steels | | **Shear Modulus** | **80-83 GPa (11,600-12,000 ksi)** | -- | Excellent for torsion applications | | **Fatigue Strength (10⁷ cycles)** | **55-60% of tensile strength** | Rotating beam test | Superior fatigue resistance | | **Maximum Service Temperature** | **220°C (428°F)** | -- | Better than carbon spring wires | ## **5. Key Characteristics & Advantages** * **Exceptional Fatigue Resistance:** Superior performance under high-cycle dynamic loading due to refined microstructure * **Elevated Temperature Stability:** Maintains mechanical properties at higher temperatures than carbon spring wires * **Excellent Toughness:** High impact resistance and fracture toughness * **Good Corrosion Resistance:** Chromium content provides better atmospheric corrosion resistance than plain carbon steels * **Superior Creep Resistance:** Minimal relaxation under sustained load at moderate temperatures * **Excellent Hardenability:** Uniform properties through cross-section, even in larger diameters * **Good Formability:** Can be cold-coiled despite high strength levels * **Resistance to Temper Embrittlement:** Vanadium inhibits embrittlement in critical temperature ranges ## **6. Primary Applications** ASTM A231 is specified for demanding, high-reliability spring applications across multiple industries. * **Automotive Engine Components:** **Valve springs** (primary application), fuel injection springs, clutch springs * **Aerospace:** Landing gear springs, actuator springs, control system springs * **Industrial Machinery:** High-cycle compressor valve springs, pump springs, heavy-duty suspension springs * **Oil & Gas:** Downhole tool springs, valve springs for high-pressure applications * **Power Generation:** Governor springs, safety valve springs * **Rail Transportation:** Suspension springs, damping system springs * **Medical Equipment:** High-reliability surgical instrument springs * **Defense:** Weapon system springs, safety mechanism springs ## **7. Processing & Fabrication Guidelines** * **Spring Manufacturing:** - **Coiling:** Can be cold-coiled; may require intermediate annealing for complex shapes - **Heat Treatment:** Stress relieving at 300-350°C for 30-60 minutes recommended - **Shot Peening:** Highly effective for fatigue life enhancement - **Presetting:** Can be prestressed to higher levels than carbon steels * **Surface Treatment:** - **Plating:** Accepts various platings; cadmium plating common for corrosion protection - **Baking:** Essential after plating (190-220°C for 4-8 hours) to prevent hydrogen embrittlement - **Alternative Coatings:** Phosphate, nitride, or proprietary coatings often used * **Welding:** Generally not recommended; if necessary, requires preheat and post-weld heat treatment * **Machining:** Difficult in hardened state; best machined in annealed condition ## **8. Performance Comparison** | Parameter | A229 (Carbon) | **A231 (Cr-V)** | A232 (Cr-Si) | | :--- | :--- | :--- | :--- | | **Typical Tensile (3mm)** | 1550-1750 MPa | **1500-1650 MPa** | 1600-1800 MPa | | **Fatigue Strength Ratio** | 50-55% | **55-60%** | 60-65% | | **Max Service Temperature** | 150°C | **220°C** | 250°C | | **Corrosion Resistance** | Poor | **Moderate** | Good | | **Cost Factor** | 1.0 | **1.5-2.0** | 2.0-2.5 | | **Primary Advantage** | Cost-effective | **Balanced performance** | Highest fatigue resistance | ## **9. Quality Assurance** Material supplied with comprehensive certification: * **Chemical Analysis Certificate** for all specified elements * **Mechanical Test Reports** (tensile, torsion, hardness) * **Metallographic Examination** report * **Non-Destructive Testing** results (optional) * **Traceability Documentation** to heat number * **Heat Treatment Records** ## **10. Design Considerations** * **Spring Design:** Can be designed to higher stress levels than carbon steels * **Fatigue Life:** Significantly longer at equivalent stress amplitudes * **Temperature Effects:** Consider reduced properties above 150°C * **Corrosion Protection:** Required for harsh environments despite chromium content * **Hydrogen Embrittlement:** Susceptible; proper baking after plating is critical --- **Disclaimer:** This technical datasheet provides reference information for ASTM A231 chromium-vanadium alloy steel spring wire. Final design and specification must be based on the complete requirements of the latest edition of **ASTM A231/A231M**. Properties are diameter-dependent, and designers must consult the standard's tables for specific values. For critical applications, prototype testing under simulated service conditions is essential. Consultation with materials engineers and spring specialists is strongly recommended. The information provided represents typical values; actual properties may vary based on manufacturer and processing parameters. -:- For detailed product information, please contact sales. -: ASTM A231 Alloy Steel Wire Specification Dimensions Size： Diameter 20-1000 mm Length <6415 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 A231 Alloy Steel Wire Properties -:- For detailed product information, please contact sales. -:

Spherical ASTM A231 Alloy Steel Powder Particle Size Description -:- For detailed product information, please contact sales. -: Applications of Spherical ASTM A231 Alloy Steel Powder -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Applications of ASTM A231 Alloy Steel Spherical Powder Wire -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A231 Alloy Steel Spherical Powder Wire -:- For detailed product information, please contact sales. -:

Packing of ASTM A231 Alloy Steel Spherical Powder Wire -:- 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 2886 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