化学成分
等级
|
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
|
力学性能
等级
|
δ5/%
|
A
|
≧18
|
B
|
≧18
|
C
|
≧19
|
D
|
≧19
|
E
|
≧19
|
厚度(直径、边长)/mm
|
≦16
|
>16~35
|
>35~50
|
>50~100
|
σs/MPa
|
≧420
|
≧400
|
≧380
|
≧360
|
等级¦温度
|
+20℃
|
0℃
|
-20℃
|
-40℃
|
A
|
||||
B
|
≧34
|
|||
C
|
≧34
|
|||
D
|
≧34
|
|||
E
|
≧27
|