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Steel Boiler and Superheater Tubes

 Marine pipes refer to the pressure pipe Grade I and II pressure resistant pipelines manufacturing ships and boiler and superheater carbon steel and carbon-manganese steel seamless pipes; boiler pipes are the seamless boiler pipes, mainly divided into medium and low-pressure boiler seamless pipe and high-pressure boiler seamless pipes. Since the production of special seamless tubes in 1993, the company has been developing new products to meet market requirements. It has sucessfully developed low, medium and high pressure boiler tubes, etc.

Mainsteel tube grade

360440 243 620-460 622-490 

 

ChemicalComposition

Grade grade

Chemical composition limits, %

C

Si

Mn

P max

S max

Ni

Cr

Mo

360

0.17

0.10-0.35

0.40-0.80

0.035

0.035

/

/

/

440

0.12-0.18

0.10-0.35

0.90-1.20

0.035

0.035

/

/

/

243

0.10-0.20

0.10-0.35

0.40-0.80

0.035

0.035

0.20

0.30

0.25-0.30

620-460

0.10-0.15

0.10-0.35

0.40-0.70

0.030

0.030

0.20

0.70-1.10

0.45-0.65

622-490

0.08-0.15

0.50

0.30-0.70

0.025

0.020

0.20

2.00-2.50

0.90-1.20

 

Mechanicalproperties

Grade grade

Mechanical properties

 

Steel type

Steel number

Yield strength MPa

Min.

Tensile strength MPa

Elongation %

Min.

Carbon

360

235

360-510

24

 

Carbon manganese

440

245

440-580

21

 

0.3%Mo

243

275

480-630

22

 

1%Cr0.5%Mo

620-460

180

460-610

22

 

2.25%Cr1%Mo

622-490

275

490-640

20

 

 

 



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