|
壁厚允许偏差
|
|
标准
|
壁厚(S)
|
壁厚允许偏差
|
|
GB3087-1999
|
≤20
|
+15%,-12.5%(最小为+0.45mm,-0.35mm)
|
|
>20
|
±12.5%
|
|
GB5310-1995
|
<3.5
|
+15%(最小为+0.48mm)
|
|
-10%(最小为+0.32mm)
|
|
3.5-20
|
+15%,-10%
|
|
>20
|
D<219
|
±10%
|
|
D≥219
|
+12.5%,-10%
|
|
|
外径允许偏差
|
|
标准
|
外径(D)
|
外径允许偏差
|
|
GB3087-1999
|
≤159
|
±1.0%(最小为±0.5mm)
|
|
>159
|
±1.0%
|
|
GB5310-1995
|
≤159
|
±1.0%(最小为±0.5mm)
|
|
>159
|
±1.0%
|
|
|
纵向力学性能
|
|
标准
|
牌号
|
抗拉强度(MPa)
|
屈服点（MPa）≥
|
伸长率（%） ≥
|
冲击功(J)≥
|
|
GB3087-1999
|
10
|
333-475
|
196
|
24
|
-
|
|
20
|
392-588
|
245/226
|
20
|
-
|
|
GB5310-1995
|
20G
|
410-550
|
245
|
24
|
35
|
|
20MnG
|
≥415
|
240
|
22
|
35
|
|
25MnG
|
≥485
|
275
|
20
|
35
|
|
15MoG
|
450-600
|
270
|
22
|
35
|
|
20MoG
|
≥415
|
220
|
22
|
35
|
|
12CrMoG
|
410-560
|
205
|
21
|
35
|
|
15CrMoG
|
440-640
|
235
|
21
|
35
|
|
12Cr2MoG
|
450-600
|
280
|
20
|
35
|
|
12Cr1MoVG
|
470-640
|
255
|
21
|
35
|
|
12Cr2MoWVTib
|
540-735
|
345
|
18
|
35
|
|
|
化学成份
|
|
标准
|
牌号
|
C
|
Si
|
Mn
|
P≤
|
S≤
|
Cr
|
Mo
|
V
|
Ti
|
B
|
W
|
|
GB3087-1999
|
10
|
0.07-0.14
|
0.17-0.37
|
0.35-0.65
|
0.035
|
0.035
|
≤0.15
|
-
|
-
|
-
|
-
|
-
|
|
20
|
0.17-0.24
|
0.17-0.37
|
0.35-0.65
|
0.035
|
0.035
|
≤0.25
|
-
|
-
|
-
|
-
|
-
|
|
GB5310-1995
|
20G
|
0.17-0.24
|
0.17-0.37
|
0.35-0.65
|
0.030
|
0.030
|
-
|
-
|
-
|
-
|
-
|
-
|
|
20MnG
|
0.17-0.24
|
0.17-0.37
|
0.70-1.00
|
0.030
|
0.030
|
-
|
-
|
-
|
-
|
-
|
-
|
|
25MnG
|
0.22-0.30
|
0.17-0.37
|
0.70-1.00
|
0.030
|
0.030
|
-
|
-
|
-
|
-
|
-
|
-
|
|
15MoG
|
0.12-0.20
|
0.17-0.37
|
0.40-0.80
|
0.030
|
0.030
|
-
|
0.25-0.35
|
-
|
-
|
-
|
-
|
|
20MoG
|
0.15-0.25
|
0.17-0.37
|
0.40-0.80
|
0.030
|
0.030
|
-
|
0.44-0.65
|
-
|
-
|
-
|
-
|
|
12CrMoG
|
0.08-0.15
|
0.17-0.37
|
0.40-0.70
|
0.030
|
0.030
|
0.40-0.70
|
0.40-0.55
|
-
|
-
|
-
|
-
|
|
15CrMoG
|
0.12-0.18
|
0.17-0.37
|
0.40-0.70
|
0.030
|
0.030
|
0.80-1.10
|
0.40-0.55
|
-
|
-
|
-
|
-
|
|
12Cr2MoG
|
0.08-0.15
|
≤0.50
|
0.40-0.70
|
0.030
|
0.030
|
2.00-2.50
|
0.90-1.20
|
-
|
-
|
-
|
-
|
|
12Cr1MoG
|
0.08-0.15
|
0.17-0.37
|
0.40-0.70
|
0.030
|
0.030
|
0.90-1.20
|
0.25-0.35
|
0.15-0.30
|
-
|
-
|
-
|
|
12Cr2MoWVTiB
|
0.08-0.15
|
0.45-0.75
|
0.45-0.65
|
0.030
|
0.030
|
1.60-2.10
|
0.50-0.65
|
0.28-0.42
|
0.08-0.18
|
0.002-0.18
|
0.30-0.55
|
|
