Spring wire · ASTM A313
17-7PH spring temper
Overview
17-7PH spring temper is a spring wire grade (ASTM A313) for coiled springs and wire forms.
Typical supply: Wire, strip
Mechanical Properties
Young's modulus E204 GPa
Shear modulus G76 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/ρ1.79e+5 Pa·m³/kg
Specific stiffness E/ρ2.62e+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 A313
Equivalent Materials
Electrical Properties
Not published for this grade.
Chemical Composition
Not published for this grade.
Machinability
Machinability index: 40 (AISI 1212 ≈ 100)
Usually formed rather than machined; cut-off and coiling dominate processing.
Cost
Relative cost band: high
Wire grade and diameter drive cost; music wire is commodity, exotic alloys premium.
Corrosion
Class: good
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.