船舶用無縫鋼管
尺寸公差
|
|||
外徑(D)
|
≤159
|
%26gt;159
|
|
外徑允許偏差
|
±1.0%(最小為±0.5mm)
|
±1.25%
|
|
壁厚(S)
|
≤20
|
S%26gt;20
|
D≥351
|
壁厚允許偏差
|
+15%,-10%(最小為+0.45mm,-0.30mm)
|
±10%
|
±15%
|
縱向力學性能
|
||||
類別
|
綱級
|
抗拉強度(MPa)
|
屈服點(MPa)≥
|
延伸率(%)≥
|
碳鋼和碳錳鋼
|
360
|
360-480
|
215
|
24
|
410
|
410-530
|
235
|
22
|
|
490
|
490-610
|
285
|
21
|
|
1Cr0.5Mo
|
440
|
440-600
|
275
|
22
|
2.25Cr1Mo
|
410
|
410-560
|
235
|
20
|
490
|
490-640
|
275
|
16
|
化學成份
|
|||||||||||||
分類
|
鋼級
|
C
|
Si
|
Mn
|
P≤
|
S≤
|
Cr
|
Mo
|
Ni
|
Cu
|
Sn
|
W
|
總量
|
碳鋼和
碳錳鋼
|
360
|
≤0.17
|
≤0.35
|
0.40-0.80
|
0.040
|
0.040
|
≤0.25
|
≤0.10
|
≤
0.30
|
≤
0.30
|
-
|
-
|
≤
0.70
|
410
|
≤0.21
|
≤0.35
|
0.40-1.20
|
0.040
|
0.040
|
≤0.25
|
≤0.10
|
≤
0.30
|
≤
0.30
|
-
|
-
|
≤
0.70
|
|
440
|
≤0.23
|
≤0.35
|
0.80-1.50
|
0.040
|
0.040
|
≤0.25
|
≤0.10
|
≤
0.30
|
≤
0.30
|
-
|
-
|
≤
0.70
|
|
1Cr0.5Mo
|
440
|
0.10-0.18
|
0.10-0.35
|
0.40-0.70
|
0.040
|
0.040
|
0.70-1.10
|
0.45-0.65
|
≤
0.30
|
≤
0.25
|
≤
0.03
|
≤
0.020
|
-
|
2.25Cr1Mo
|
410
|
0.08-0.15
|
0.10-0.35
|
0.40-0.70
|
0.040
|
0.040
|
2.00-2.50
|
0.90-1.20
|
≤
0.30
|
≤
0.25
|
≤
0.03
|
≤
0.020
|
-
|