20G

Grade 20G Seamless Steel is applicable to seamless tubes for making steam boiler whose pressure is high or higher and seamless tubes used as pipelines.

is a high-quality carbon structural steel, boiler material, the carbon content of 0.17-0.24%, tensile strength of 410Mpa, yield point 230-250Mpa. Is our main production of steel, we can provide 20G with high quality and competitive price. Here to introduce you to our 20G basic chemical properties and mechanical properties.

Chemical Compositions(%) of GB5310 20G:
Chemical elements Data
Carbon 0.17-0.24
Silicon 0.17-0.37
Manganese 0.70-1.00
Phosphorus(max) 0.03
Sulfur(max) 0.03
Chromium(max) 0.25
Molybdenum(max) 0.15
Cuprum(max) 0.2
Nickel(max) 0.25
Vanadium(max) 0.08
Mechanical Properties of GB5310 20G:
Properties Data
Yield Strength (Mpa) ≥415
Tensile Strength (Mpa) 240
Elongation (%) 22
The W.T. tolerance of GB5310 20G:
W.T.(S) Tolerance of W.T.
<3.5  +15%(+0.48mm min)
 -10%(+0.32mm min)
3.5-20 +15%,-10%
>20 D<219 ±10%
D≥219 +12.5%,-10%
Additional Condition

UT(Ultrasonic examination), AR(As Hot Rolled only), TMCP(Thermal Mechanical Control Processing), N(Normalized), Q+T(Quenched and Tempered),Z Direction Test(Z15,Z25,Z35), Charpy V-Notch Impact Test, The Third Party Test (such as SGS Test), Coated or Shot Blasting and Painting.

GB5310 Application

GB5310 20G seamless steel pipes are mainly used for pressure vessels, machinery, pipe fittings, oil and chemical industry.

Other Name

GB5310 20G boiler steel pipe, 20G boiler 20G boiler pipe

Boiler tubing is used in these industries:
  • Steam Boilers
  • Power Generation
  • Fossil Fuel Plants
  • Electric Power Plants
  • Industrial Processing Plants
  • Cogeneration Facilities

Q245R grade (equal to 20G)

20G seamless steel pipe is a high-quality carbon structural steel, boiler material, the carbon content of 0.17-0.24%, tensile strength of 410Mpa, yield point 230-250Mpa.

Seamless steel pipe Q245R grade (equal to 20G)
57mm cutting end


12mm wall thickness


57mm all


2mm out diameter


57mm length


Out diameter 42mm all


42mm all


57mm out diameter


57mm wall thickness


Wall thickness measurment


57mm out diameter

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