Specification for aircraft material. 12 per cent chromium corrosion-resisting steel (45/55 tonf/sq in: limiting ruling section 6 in)
| Elements | Min.（≥） | Max.（≤） | Similar | Remarks |
|---|---|---|---|---|
| C | 0.18 | 0.25 | ||
| Si | - | 0.80 | ||
| Mn | - | 1.00 | ||
| P | - | 0.030 | ||
| S | - | 0.025 | ||
| Cr | 12.00 | 14.00 | ||
| Ni | - | 1.00 | ||
| Mo | - | - | ||
| Nb/Ti | - | - |
Specification for aircraft material. 12 per cent chromium corrosion-resisting steel (45/55 tonf/sq in: limiting ruling section 6 in)
| 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) |
|---|---|---|---|---|---|---|
| 749 (≥) | 134 (≥) | 34 | 23 | 12 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 444 |
| 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 |
|---|---|---|---|---|---|---|---|
| 723 (≥) | 288 (≥) | 31 | 44 | 41 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 321 | |
| Temp. °C/°F |
Creep strain limit (10000h) (Rp1,0) N/mm2 |
Creep rupture strength (10000h) (Rp1,0) N/mm2 |
|||||
| 266 | 316 | 632 |
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