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高压化肥设备用无缝钢管

标准: GB6479——中国国家标准

用途:
用于高压化肥设备和管道用无缝钢管。

主要生产钢管牌号:
10、20、16Mn、10MoWVNb、15CrMo、1Cr5Mo、12 Cr2Mo等

尺寸公差:

钢管种类

外径(D)

钢管壁厚(S)

冷拔管

钢管外径(mm)

允许偏差(mm)

钢管壁厚(mm)

允许偏差(mm)

>30~50

±0.3

≤30

±10%

>50~219

±0.8%

热轧管

>219

±1.0%

>20

±10%

 

力学性能:

标准

牌号

抗拉强度(MPa)

屈服强度(MPa)

伸长率(%)

冲击功(J)

低温冲击Akv

GB6479

10

335~490

≥205

≥24

/

-20℃≥18

20

410~550

≥245

≥24

≥39

-20℃≥18

16Mn

490~670

≥320

≥21

≥47

-40℃≥21

10MoWVNb

470~670

≥295

≥19

≥62

15CrMo

440~640

≥235

≥21

≥47

1Cr5Mo

390~590

≥195

≥22

≥94

12 Cr2Mo

450~600

≥280

≥20

≥38

 

化学成分:

标准

牌号

化学成分(%)

C

Si

Mn

P

S

Cr

Mo

Ni

GB

6479

10

0.07~0.14

0.17~0.37

0.35~0.65

≤0.030

≤0.030

/

/

/

20

0.17~0.24

0.17~0.37

0.35~0.65

≤0.030

≤0.030

/

/

/

16Mn

0.12~0.20

0.20~0.60

1.20~1.60

≤0.030

≤0.030

10MoWVNb

0.07~0.13

0.50~0.80

0.50~0.80

≤0.030

≤0.030

/

0.60~0.90

/

15CrMo

0.12~0.18

0.17~0.37

0.40~0.70

≤0.030

≤0.030

0.80~1.10

0.40~0.55

/

1Cr5Mo

≤0.15

≤0.50

≤0.60

≤0.030

≤0.030

4.00~6.00

0.45~0.60

≤0.60

12 Cr2Mo

0.80~0.15

≤0.50

0.40~0.70

≤0.030

≤0.030

2.0~2.50

0.90~1.20

注:



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