Spring wire · ASTM A227
Hard-drawn wire (A227), 2 mm
Overview
Hard-drawn wire (A227), 2 mm is a spring wire grade (ASTM A227) for coiled springs and wire forms.
Typical supply: Wire, strip
Mechanical Properties
Young's modulus E198.6 GPa
Shear modulus G80.7 GPa
Yield / proof Re1e+3 MPa
Ultimate Rm2e+3 MPa
Poisson's ratio ν0.3
Thermal Properties
Not published for this grade.
Physical Properties
Density ρ8e+3 kg/m³
Specific strength Sy/ρ1.40e+5 Pa·m³/kg
Specific stiffness E/ρ2.53e+7 Pa·m³/kg
Typical supply: Wire, strip
Density near steel (~7850 kg/m³) unless stainless / specialty alloy.
Applications
- Compression, extension, and torsion springs
- Wire forms and clips
- High-cycle fatigue springs
Advantages
- High tensile strength for elastic energy storage
- Designed for cyclic loading when properly stressed
- Standard wire grades simplify spring design tables
Limitations
- Not a structural framing material
- Sensitive to surface quality and corrosion pits
- Heat / hydrogen embrittlement risks if processed incorrectly
Standards
- ASTM A227
Equivalent Materials
Electrical Properties
Not published for this grade.
Chemical Composition
Not published for this grade.
Machinability
Usually formed rather than machined; cut-off and coiling dominate processing.
Cost
Wire grade and diameter drive cost; music wire is commodity, exotic alloys premium.
Corrosion
Carbon spring wires need coating or oil; stainless spring wire for corrosive service.
- Indoor dry (coated)good
- Outdoor uncoated carbon wirepoor
For allowance / life screening, open Corrosion Allowance.