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AFNOR X7CrNiAl17-7 Details
Steel wire for mechanical springs - Part 3: Stainless spring steel wire
AFNOR X7CrNiAl17-7 Standard Download
X7CrNiAl17-7 Datasheet
AFNOR X7CrNiAl17-7| Category | Type | Grade | Microstructure | Designations |
|---|---|---|---|---|
| Grades | Stainless Steels | X7CrNiAl17-7 | Precipitation-Hardening | France - AFNOR , NF EN 10088-1 - Stainless steels - Part 1: List of stainless steels NF EN 10088-2 - Stainless steels - Part 2: Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes NF 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 NF EN 10088-4 - Stainless steels - Part 4: Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for construction purposes NF 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 NF EN 10151 - Stainless steel strip for springs - Technical delivery conditions NF EN 10270-3 - Steel wire for mechanical springs - Part 3: Stainless spring steel wire |
| Elements | Min.（≥） | Max.（≤） | Similar | Remarks |
|---|---|---|---|---|
| C | - | 0.09 | ||
| Si | - | 0.70 | ||
| Mn | - | 1.00 | ||
| P | - | 0.040 | ||
| S | - | 0.015 | ||
| Cr | 16.00 | 18.00 | ||
| Mo | - | - | ||
| Ni | 6.50 | 7.80 | ||
| Al | 0.70 | 1.50 |
| Proof strength Rp0.2 (MPa) |
Tensile strength Rm (MPa) |
Impact energy KV (J) |
Elongation at fracture A (%) |
Reduction in cross section on fracture Z (%) |
As-Heat-Treated Condition | Brinell hardness (HBW) |
|---|---|---|---|---|---|---|
| 859 (≥) | 728 (≥) | 43 | 43 | 12 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 212 |
| Property | Density kg/dm3 |
Temperature T °C/F |
Specific heat J / kgK |
Thermal conductivity W/mK |
Electric resistance µΩ·cm |
Modulus of elasticity kN/mm2 |
Expansion rate |
|---|---|---|---|---|---|---|---|
| 116 (≥) | 915 (≥) | 24 | 24 | 12 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 311 | |
| Temp. °C/°F |
Creep strain limit (10000h) (Rp1,0) N/mm2 |
Creep rupture strength (10000h) (Rp1,0) N/mm2 |
|||||
| 365 | 964 | 761 |
| Product type | Products | Dimension | Processes | Deliver Status |
|---|---|---|---|---|
| Plates / Sheets | Plates / Sheets | 0.08-200mm(T)*W*L | Forging, hot rolling and cold rolling | Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting |
| Steel Bar | Round Bar, Flat Bar, Square Bar | Φ8-1200mm*L | Forging, hot rolling and cold rolling, Cast | Black, Rough Turning, Shot Blasting, |
| Coil / Strip | Steel Coil /Steel Strip | 0.03-16.0x1200mm | Cold-Rolled & Hot-Rolled | Annealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting |
| Pipes / Tubes | Seamless Pipes/Tubes, Welded Pipes/Tubes | OD:6-219mm x WT:0.5-20.0mm | Hot extrusion, Cold Drawn, Welded | Annealed, Solution and Aging, Q+T, ACID-WASHED |
| Grade | Standard | Country | Application |
|---|---|---|---|
| X7CrNiAl17-7 | B.S. | UK | Steel wire for mechanical springs - Part 3: Stainless spring steel wire |
| 1.4568 | B.S. | UK | Steel wire for mechanical springs - Part 3: Stainless spring steel wire |
| X7CrNiAl17-7 | AFNOR | France | Steel wire for mechanical springs - Part 3: Stainless spring steel wire |
| 1.4568 | AFNOR | France | Steel wire for mechanical springs - Part 3: Stainless spring steel wire |
| X7CrNiAl17-7 | ISO | International | Stainless steels - Chemical composition |
