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AFNOR Z12CKNDWNb21-20-20 Details
Valve steels and alloys for internal combustion engines
AFNOR Z12CKNDWNb21-20-20 Standard Download
Z12CKNDWNb21-20-20 Datasheet
AFNOR Z12CKNDWNb21-20-20| Category | Type | Grade | Designations |
|---|---|---|---|
| Grades | Stainless Steels | Z12CKNDWNb21-20-20 | France - AFNOR , NF A 35-579 - Valve steels and alloys for internal combustion engines |
| Elements | Min.（≥） | Max.（≤） | Similar | Remarks |
|---|---|---|---|---|
| C | 0.08 | 0.16 | ||
| Si | - | 1.00 | ||
| Mn | 1.00 | 2.00 | ||
| P | - | 0.040 | ||
| S | - | 0.030 | ||
| Cr | 20.00 | 22.50 | ||
| Ni | 19.00 | 21.00 | ||
| Mo | 2.50 | 3.50 | ||
| Co | 18.50 | 21.00 | ||
| W | 2.00 | 3.00 | ||
| Nb | 0.75 | 1.25 | ||
| N | 0.10 | 0.20 |
| 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) |
|---|---|---|---|---|---|---|
| 697 (≥) | 391 (≥) | 13 | 11 | 21 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 413 |
| 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 |
|---|---|---|---|---|---|---|---|
| 854 (≥) | 438 (≥) | 12 | 21 | 22 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 333 | |
| Temp. °C/°F |
Creep strain limit (10000h) (Rp1,0) N/mm2 |
Creep rupture strength (10000h) (Rp1,0) N/mm2 |
|||||
| 275 | 356 | 871 |
| 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 |
|---|---|---|---|
| Z12CKNDWNb21-20-20 | AFNOR | France | Valve steels and alloys for internal combustion engines |