等級 | C | Mn | Si | P | S | V | Nb | Ti | Al | Cr | Ni |
A | ≦0.20 | 1.00~1.70 | ≦0.55 | ≦0.045 | ≦0.045 | 0.02~0.20 | 0.015~0.060 | 0.02~0.20 | - | ≦0.40 | ≦0.70 |
B | ≦0.20 | 1.00~1.70 | ≦0.55 | ≦0.040 | ≦0.040 | 0.02~0.20 | 0.015~0.060 | 0.02~0.20 | - | ≦0.40 | ≦0.70 |
C | ≦0.20 | 1.00~1.70 | ≦0.55 | ≦0.035 | ≦0.035 | 0.02~0.20 | 0.015~0.060 | 0.02~0.20 | ≧0.015 | ≦0.40 | ≦0.70 |
D | ≦0.20 | 1.00~1.70 | ≦0.55 | ≦0.030 | ≦0.030 | 0.02~0.20 | 0.015~0.060 | 0.02~0.20 | ≧0.015 | ≦0.40 | ≦0.70 |
E | ≦0.20 | 1.00~1.70 | ≦0.55 | ≦0.025 | ≦0.025 | 0.02~0.20 | 0.015~0.060 | 0.02~0.20 | ≧0.015 | ≦0.40 | ≦0.70 |
等級 | δ5/% |
A | ≧18 |
B | ≧18 |
C | ≧19 |
D | ≧19 |
E | ≧19 |
厚度(直徑、邊長)/mm | ≦16 | >16~35 | >35~50 | >50~100 |
σs/MPa | ≧420 | ≧400 | ≧380 | ≧360 |
等級¦溫度 | +20℃ | 0℃ | -20℃ | -40℃ |
A | ? | ? | ? | ? |
B | ≧34 | ? | ? | ? |
C | ? | ≧34 | ? | ? |
D | ? | ? | ≧34 | ? |
E[2] | ? | ? | ? | ≧27 |