高压锅炉用西安合金管标准:
GB5310--中国国家标准
用途:
用于高压锅炉(工作压力一般不大于9.8Mpa,工作温度在450℃-650℃之间)的受热面管子、集箱、省煤器、过热器、再热器等。(P<9.8MPa,450℃<T<650℃)
尺寸公差
种类
|
钢管尺寸
mm
|
允许偏差
|
普通级
|
高级
|
热轧(挤)管
|
外径
D
|
≤159
|
+1.0%(最小值为+0.5mm)
|
+0.75%(最小值为+0.3mm)
|
>159
|
+1.0%
|
+0.90%
|
壁厚
S
|
<3.5
|
+15%(最小值为+0.48mm)
-10% (最小值为-0.32mm)
|
+1.0%(最小值为+0.2mm)
|
3.5~20
|
+15%
-10%
|
+10%
|
>20
|
D<219
|
+10%
|
+7.5%
|
D≥219
|
+12.5%
-10.0%
|
+10%
|
冷拔(轧)管
|
外径
D
|
≤30
|
+0.20mm
|
+0.15mm
|
>30~50
|
+0.30mm
|
+0.25mm
|
>50
|
+0.8%
|
+0.6%
|
壁厚
S
|
2~3
|
+12%
-10%
|
+10%
|
>3
|
+10%
|
+7.5%
|
机械性能:
标准
|
牌号/抗拉强度(Mpa)
|
屈服强度(Mpa)
|
伸长率(%)
|
5310-95
|
20G
|
410~550
|
≥ 245
|
≥ 24
|
25MnG
|
≥ 415
|
≥ 240
|
≥ 22
|
15MoG
|
450~600
|
≥ 270
|
≥ 22
|
15CrMoG
|
440~640
|
≥ 235
|
≥ 21
|
12Cr2MoG
|
450~600
|
≥ 280
|
≥ 20
|
12Cr1MoVG
|
470~640
|
≥ 255
|
≥ 21
|
化学成份:
标准
|
牌号
|
化学成分
|
C
|
Si
|
Mn
|
P
|
S
|
Cr
|
Mo
|
Cu
|
Ni
|
|
GB5310
|
20G
|
0.17-0.24
|
0.17-0.37
|
0.35-0.65
|
≤0.030
|
≤0.030
|
/
|
/
|
≤0.20
|
≤0.25
|
/
|
20MnG
|
0.17-0.24
|
0.17-0.37
|
0.70-1.00
|
≤0.030
|
≤0.030
|
/
|
/
|
≤0.20
|
≤0.25
|
/
|
15MoG
|
0.12-0.18
|
0.17-0.37
|
0.40-0.80
|
≤0.030
|
≤0.030
|
/
|
0.25-0.35
|
≤0.20
|
≤0.30
|
/
|
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
|
≤0.20
|
≤0.30
|
/
|
12Cr2MoG
|
0.08-0.15
|
≤0.50
|
0.40-0.70
|
≤0.030
|
≤0.030
|
2.00-2.50
|
0.90-1.20
|
≤0.20
|
≤0.30
|
/
|
12Cr1MoVG
|
0.08-0.15
|
0.17-0.37
|
0.40-0.70
|
≤0.030
|
≤0.030
|
0.90-1.20
|
0.25-0.35
|
≤0.20
|
≤0.30
|
0.15-0.35
|
|