20G high pressure boiler tubes are seamless carbon steel pipes produced according to the GB 5310 standard, offering tensile strength of 410–640 MPa and yield strength above 245 MPa. With excellent heat resistance, pressure durability, and structural stability, they are widely used in boilers, superheaters, heat exchangers, and power plant piping systems operating at temperatures up to 450 °C.
Product Parameters
|
Item |
Description |
|
Material Grade |
20G |
|
Manufacturing Process |
Hot-rolled or cold-drawn seamless process |
|
Outer Diameter Range (OD) |
10 mm – 426 mm |
|
Wall Thickness Range (WT) |
1.5 mm – 36 mm |
|
Length |
5.8 m – 12 m (customized lengths available) |
|
Surface Condition |
Black, oiled, or polished finish |
|
Tensile Strength |
410 – 640 MPa |
|
Yield Strength |
≥ 245 MPa |
|
Elongation |
≥ 20 % |
|
Hardness (HB) |
≤ 156 HB (normalized condition) |
|
Working Temperature |
Up to 450 °C |
|
Working Pressure |
Up to 16 MPa depending on wall thickness |
|
Heat Treatment |
Normalized or tempered to enhance structure and strength |
|
Dimensional Tolerance |
OD ±1 %, WT ±10 %, length ±50 mm |
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