UK B.S. BS EN 10088-1, BS EN 10088-2, BS EN 10088-3, BS EN 10088-4, BS EN 10088-5, BS EN 10151, BS EN 10270-3, X7CrNiAl17-7 Specialsteel Steel wire for mechanical springs - Part 3: Stainless spring steel wire and Mechanical Properties, Chemical Element, Cross Reference, Datasheet.
| Category | Class | Grade | Type | Standard | Country | Application | 
|---|---|---|---|---|---|---|
| Steel Grades | Specialsteel | X7CrNiAl17-7 | Precipitation-Hardening | B.S. | UK | Steel wire for mechanical springs - Part 3: Stainless spring steel wire | 
| C | Si | Mn | P | S | Cr | Ni | Mo | Al | 
|---|---|---|---|---|---|---|---|---|
| ≤0.09 | ≤0.70 | ≤1.00 | ≤0.04 | ≤0.015 | 16.00 -18.00 | 6.50 -7.80 | ≤ ≥ | 0.70 -1.50 | 
| Yield Rp0.2 (MPa) | Tensile Rm (MPa) | Impact KV/Ku (J) | Elongation A (%) | Reduction in cross section on fracture Z (%) | As-Heat-Treated Condition | Brinell hardness (HBW) | 
|---|---|---|---|---|---|---|
| 165 (≥) | 599 (≥) | 44 | 22 | 11 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 331 | 
| Temperature (°C) | Modulus of elasticity (GPa) | Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and | Thermal conductivity (W/m·°C) | Specific thermal capacity (J/kg·°C) | Specific electrical resistivity (Ω mm²/m) | Density (kg/dm³) | Poisson’s coefficient, ν | 
|---|---|---|---|---|---|---|---|
| 21 | - | - | 0.14 | - | |||
| 752 | 189 | - | 12.3 | 132 | - | ||
| 575 | - | 24 | 34.2 | 144 | 132 | 
Heat treated : 1573°C - 1727°C
| BS EN 10088-1 | Stainless steels - Part 1: List of stainless steels | BS-EN-10088-1.pdf | 
| BS EN 10088-2 | Stainless steels - Part 2: Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes | BS-EN-10088-2.pdf | 
| BS EN 10088-3 | Stainless steels - Part 3: Technical delivery conditions for semi-finished products, bars, rods, wire, sections and bright products of corrosion resisting steels for general purposes | BS-EN-10088-3.pdf | 
| BS EN 10088-4 | Stainless steels - Part 4: Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for construction purposes | BS-EN-10088-4.pdf | 
| BS EN 10088-5 | Stainless steels - Part 5: Technical delivery conditions for bars, rods, wire, sections and bright products of corrosion resisting steels for construction purposes | BS-EN-10088-5.pdf | 
| BS EN 10151 | Stainless steel strip for springs - Technical delivery conditions | BS-EN-10151.pdf | 
| BS EN 10270-3 | Steel wire for mechanical springs - Part 3: Stainless spring steel wire | BS-EN-10270-3.pdf | 
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