Spherical ASTM A227M Steel Powder, Class I

ASTM A227M Steel Spherical Powder Wire, Class I Product Information -:- For detailed product information, please contact sales. -: ASTM A227M Steel Spherical Powder Wire, Class I Synonyms -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Spherical ASTM A227M Steel Powder, Class I characteristics -:- For detailed product information, please contact sales. -: Spherical ASTM A227M Steel Powder, Class I 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 A227M Steel Powder, Class I 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 A227M Steel Powder, Class I Chemical Composition -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: ASTM A227M Steel Wire, Class I Product Information -:- For detailed product information, please contact sales. -: # **Product Datasheet: ASTM A227M Class I Hard-Drawn Steel Wire (Metric)** ## **1. Product Overview** **ASTM A227M Class I** is a **cold-drawn, high-carbon steel wire** supplied in metric dimensions to meet international engineering requirements. As the standard strength grade within the A227M specification, this hard-drawn mechanical spring wire combines high tensile strength, good surface finish, and dimensional precision without undergoing a final heat treatment after drawing. Its production through cold working achieves a favorable balance of strength and moderate ductility, making it a cost-effective solution for general-purpose springs and wire forms where high dynamic fatigue resistance is not the primary design criterion. ## **2. International Standards & Designations** | System/Authority | Designation | Specification Title / Relationship | | :--- | :--- | :--- | | **ASTM International** | **ASTM A227/A227M** | Standard Specification for Steel Wire, Cold-Drawn for Mechanical Springs (Metric) | | **Class** | **Class I** | Standard Tensile Strength Grade | | **ISO** | **ISO 8458-2** | Mechanical springs - Steel spring wire - Part 2: Oil hardened and tempered spring wire *(Note: Different process)* | | **ISO (Closer Match)** | **ISO 8458-3** | Patented cold-drawn non-alloy steel spring wire | | **EN (Europe)** | **EN 10270-1** | Steel wire for mechanical springs - Part 1: Patented cold-drawn unalloyed spring steel wire | | **JIS (Japan)** | **JIS G 3521** | Hard Drawn Steel Wire for Springs (SW) | | **DIN (Germany)** | **DIN 17223-1** | Patented cold-drawn unalloyed steel spring wire - Basic grade | | **Common Names** | Hard Drawn Spring Wire (Metric), HD Wire, Class I Metric Wire | ## **3. Chemical Composition (% by Weight)** The composition is based on standard high-carbon steel grades suitable for cold drawing to spring wire. | Element | ASTM A227M Requirement (Typical Basis Steel) | Typical % Range | | :--- | :--- | :--- | | **Carbon (C)** | **0.60 - 0.75** | 0.65 - 0.75 | | **Manganese (Mn)** | 0.30 - 0.80 | 0.60 - 0.80 | | **Phosphorus (P)** | ≤ 0.040 | ≤ 0.030 | | **Sulfur (S)** | ≤ 0.050 | ≤ 0.035 | | **Silicon (Si)** | 0.15 - 0.35 | 0.15 - 0.30 | | **Iron (Fe)** | Balance | Balance | **Manufacturing Process:** The wire begins as hot-rolled rod of a high-carbon steel (similar to AISI 1065 or 1070). It undergoes a **patenting process** (isothermal transformation to fine pearlite) to achieve a uniform, ductile microstructure ideal for severe cold drawing. The wire is then cold drawn through a series of dies to the final metric diameter. **No final tempering heat treatment is applied**, leaving the wire in the "hard-drawn" condition where its strength is derived from cold work. ## **4. Mechanical & Physical Properties (Metric)** Properties are specified by wire diameter in millimeters. Strength decreases as diameter increases. | Property | ASTM A227M Class I Specifications | Test Standard | Notes | | :--- | :--- | :--- | :--- | | **Condition** | **Hard Drawn (As-Drawn)** | -- | Final properties achieved through cold work. | | **Tensile Strength (R_m)** | **Diameter-Dependent:**
• 0.50 mm: 2150 - 2400 MPa
• 2.00 mm: 1750 - 1950 MPa
• 4.00 mm: 1550 - 1700 MPa
• 6.00 mm: 1400 - 1550 MPa | ASTM A370 / ISO 6892-1 | Refer to ASTM A227M Table 2 for complete range. | | **Torsion Test** | Required. Minimum number of twists (360° rotations) specified per diameter before fracture. | ASTM A938 / ISO 7800 | Ensures sufficient ductility and absence of internal defects. | | **Coiling Test** | Wire must coil satisfactorily around a mandrel (size relative to wire diameter) without cracking. | Practical Test | Verifies formability for spring manufacturing. | | **Surface Quality** | Must be smooth, bright, and free from scale, seams, rust, or other defects detrimental to performance. | Visual / Microscopic | Critical for fatigue life. | | **Dimensional Tolerance** | Specified in ASTM A227M Table 1 (e.g., ±0.025 mm for d ≤ 1.00 mm). | -- | Tighter than hot-rolled products. | | **Modulus of Elasticity (E)** | ~200 GPa | -- | Assumed for spring design calculations. | | **Shear Modulus (G)** | ~77 GPa | -- | | | **Density** | 7.85 g/cm³ | -- | | ## **5. Key Characteristics & Advantages** * **Cost-Effective Strength:** Provides high tensile strength at a lower cost compared to oil-tempered or alloy spring wires. * **Excellent Surface Finish:** The cold drawing process yields a smooth, bright surface that minimizes stress concentration points. * **Good Dimensional Consistency:** Precise metric diameter control ensures repeatable spring performance. * **No Decarburization:** The absence of a final heat treatment eliminates the risk of surface decarburization, preserving the full carbon content and surface hardness. * **Adequate Formability:** Can be cold-coiled into springs at room temperature, though it is less formable than oil-tempered wire. * **Metric Standard Compliance:** Ideal for designs and manufacturing facilities operating on the metric system. ## **6. Primary Applications** ASTM A227M Class I is used globally for a wide variety of general-purpose, statically loaded or low-cycle dynamic springs. * **Extension & Torsion Springs:** In household appliances, office equipment, furniture, and agricultural implements. * **Light to Medium Compression Springs:** For electrical switches, latch mechanisms, automotive interior components, and consumer products. * **Wire Forms and Clips:** Retaining rings, cotter pins, and stamped/bent wire components. * **Industrial Maintenance:** Springs for valves, clutches, and brakes in non-critical, moderate-duty service. * **Toys and General Hardware.** ## **7. Processing & Fabrication Guidelines** * **Spring Coiling:** Can be coiled on automatic spring coiling machines. **Stress relieving after coiling is strongly recommended** to relieve internal stresses, stabilize dimensions (prevent "set"), and improve load characteristics. * **Stress Relieving:** Typical parameters: **230-290°C for 30-60 minutes**. This low-temperature thermal treatment relieves coiling stresses without significantly reducing tensile strength. * **Plating/Coating:** Accepts electroplating (zinc, nickel) and organic coatings. **Post-plating baking is CRITICAL** to prevent hydrogen embrittlement: **190-220°C for 2-8 hours**, depending on plating thickness and wire diameter. * **Welding:** **Not recommended.** The high carbon content and cold-worked structure make the wire prone to cracking in the heat-affected zone. * **Design Consideration:** This wire is **not suitable** for applications involving high dynamic fatigue, severe shock loads, elevated temperatures (>120°C), or highly corrosive environments without adequate protection. ## **8. Comparison with Key Metric Spring Wires** | Wire Standard | Designation | Process | Key Feature | Best For | | :--- | :--- | :--- | :--- | :--- | | **ASTM A227M** | **Class I** | Hard Drawn | **Cost, Strength, Bright Finish** | General-purpose, low-cost springs | | **EN 10270-1** | **SH Class** | Patented & Cold Drawn | Similar to A227M, European standard | European market, general springs | | **ASTM A229M** | Oil-Tempered | Drawn & Tempered | **Better Formability & Fatigue** | Higher duty, automotive | | **ASTM A228M** | Music Wire | Special Patented & Drawn | **Highest Strength, Best Fatigue** | Precision dynamic springs (valves) | | **EN 10270-2** | **DH Class** | Oil-Hardened & Tempered | Similar to A229M | European market, dynamic springs | ## **9. Quality Assurance** Material is supplied with a **Inspection Certificate 3.1 per EN 10204** or equivalent Mill Test Report, including: * Heat chemical analysis * Mechanical test results (tensile strength, torsion test) for representative sizes * Dimensional verification * Statement of conformity to ASTM A227M, Class I --- **Disclaimer:** This datasheet is for informational purposes. For design and procurement, the complete and authoritative specifications in the latest edition of **ASTM A227/A227M** shall govern. Designers must use the tensile strength values corresponding to the specific wire diameter from the standard's tables. Consultation with a spring manufacturing engineer is recommended for critical applications. -:- For detailed product information, please contact sales. -: ASTM A227M Steel Wire, Class I Specification Dimensions Size： Diameter 20-1000 mm Length <6411 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 I Properties -:- For detailed product information, please contact sales. -:

Spherical ASTM A227M Steel Powder, Class I Particle Size Description -:- For detailed product information, please contact sales. -: Applications of Spherical ASTM A227M Steel Powder, Class I -:- For detailed product information, please contact sales. -: -:- For detailed product information, please contact sales. -: Applications of ASTM A227M Steel Spherical Powder Wire, Class I -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A227M Steel Spherical Powder Wire, Class I -:- For detailed product information, please contact sales. -:

Packing of ASTM A227M Steel Spherical Powder Wire, Class I -:- 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 2882 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