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Product Name

Material

Standard

Specification

Application

High pressure boiler tube

20G
ASTM SA106B/C
ASTM SA210A/C
ST45.8-III   

12Cr1MoVG

15CrMoG

P91

1Cr5Mo

GB5310-1995
ASTM SA106
ASTM SA210
DIN17175-79

∮8-1240*1-200

apply to produce high pressure boiler, header, steam

 

Chemical composition / Mechanical property


Standard

Steel grade

Chemical composition(%)

C

Mn

Si

V

Cr

Mo

P.S

GB5310

20G

0.17～0.24

0.35～0.65

0.17～0.37

/

/

/

≤ 0.030

25MnG

0.22～0.30

0.70～1.00

0.17～0.37

/

/

/

≤ 0.030

15MoG

0.12～0.20

0.40～0.80

0.17～0.37

/

/

0.25～0.35

≤ 0.030

15CrMoG

0.12～0.18

0.40～0.70

0.17～0.37

/

0.80～1.10

0.40～0.55

≤ 0.030

12Cr2MoG

0.08～0.15

0.40～0.70

≤ 0.50

/

2.00～2.50

0.90～1.20

≤ 0.030

12Cr1MoVG

0.08～0.15

0.40～0.70

0.17～0.37

0.15～0.30

0.90～1.20

0.25～0.35

≤ 0.030

Mechanical property

Tensile strength (MPa)

Yield strength (MPa)

Elongation(%)

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

 

Dimension tolerance:


Steel grade

Dimension
mm

Tolerance

Common grade

Senior grade

Hot rolled
(extruded)
pipe

OD
D

≤159

+1.0%(Min+0.5mm)

+0.75%(Min+0.3mm)

>159

+1.0%

+0.90%

TH
S

<3.5

+15%(Min+0.48mm)
-10% (Min-0.32mm)

+1.0%(Min+0.2mm)

3.5~20

+15%
-10%

+10%

>20

D<219

+10%

+7.5%

D≥219

+12.5%
-10.0%

+10%

Cold drawn
(Rolled)
pipe

OD
D

≤30

+0.20mm

+0.15mm

>30~50

+0.30mm

+0.25mm

>50

+0.8%

+0.6%

TH
S

2~3

+12%
-10%

+10%

>3

+10%

+7.5%


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