Low - middle  pressure boiler tube

10#
20#
16Mn

GB3087-2008

ASTM A106 A,B

∮8-1240*1-200

Apply to all kinds of structure low pressure, middle pressure boiler and locomotive boiler

C

Mn

Si

Cr

Ni

Cu

P.S

GB3087

10

0.07～0.14

0.35～0.65

0.17～0.37

≤ 0.15

≤ 0.30

≤ 0.20

≤ 0.030

20

0.17～0.24

0.35～0.65

0.17～0.37

≤ 0.25

≤ 0.25

≤ 0.20

≤ 0.030

Mechanical property

Tensile strength ?(MPa)

Yield strength (MPa)

Elongation(%)

10

335～475

≥ 195

≥ 24

20

410～550

≥ 245

≥ 20

Common grade

Senior grade

Hot rolled
(extruded) pipe

OD
D

≤159

+1.0%(min+0.50mm)

+1.0%(min+0.5mm)

>159

+1.0%

+1.0%

TH
S

≤20

+15%(min+0.45mm)
-12.5%(min-0.35mm)

+1.0%(min+0.30mm)

>20

+12.5%

+10%

D≥351Hot expanded

+15%

Cold drawn/rolled pipe

OD
D

10~30

+0.40mm

+0.20mm

>30~50

+0.45mm

+0.25mm

>50

+1.0%

+0.75%

TH
S

1.5~3.0

+15%
-10%

+10%

>3.0

+12.5%
-10%

+10%