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Seamless steel tube for low medium pressure boiler

 

Standard of implementation: Chinese GB3087

Application: used in low-pressure boiler (working pressure is generally greater than 5.88Mpa, working temperature at 450 below) of the heating surface pipe, collecting box and steam pipe

Major steel grade : Grade10 、 20 (After consultation, can also provide other special grade of steel pipe)

Chemical composition and mechanical properties :

Standard

Steel grade

Chemical constituents (%)

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 properties

Tensile strength (MPa)

Yield strength (MPa)

Elongation (%)

10

335~475

≥ 195

≥ 24

20

410~550

≥ 245

≥ 20

Dimensional tolerance:

Type of steel tube

Steel tube size

mm

Deviation

Ordinary grade

Senior

Hot rolling (squeeze) tube

Outside diameter

D

159

+1.0%(The minimum value is+0.50mm)

+1.0%(The minimum value is+0.5mm)

>159

+1.0%

+1.0%

Wall thickness

S

20

+15%(The minimum value is+0.45mm)

-12.5%(The minimum value is-0.35mm)

+1.0%(The minimum value is+0.30mm)

>20

+12.5%

+10%

D351Heat expanding steel tube

+15%

Cold drawing (rolling) tube

Outside diameter

D

10~30

+0.40mm

+0.20mm

>30~50

+0.45mm

+0.25mm

>50

+1.0%

+0.75%

Wall thickness

S

1.5~3.0

+15%

-10%

+10%

>3.0

+12.5%

-10%

+10%

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