8162 structural steel pipes are seamless carbon steel tubes made to the GB/T 8162 standard, with tensile strength ranging from 410 to 640 MPa and yield strength above 245 MPa. They combine high strength, good toughness, and reliable weldability, making them suitable for structural parts, machinery components, and general engineering use.
Product Parameters
|
Item |
Specification / Description |
|
Standard |
GB/T 8162 – Seamless steel pipes for structural purposes |
|
Material Grades |
10#, 20#, 35#, 45#, Q345, or equivalent |
|
Manufacturing Process |
Hot-rolled or cold-drawn seamless process |
|
Outer Diameter Range (OD) |
10 mm – 630 mm |
|
Wall Thickness Range (WT) |
1.5 mm – 60 mm |
|
Length |
4 m – 12 m (customized lengths available) |
|
Surface Condition |
Black, bright, oiled, or galvanized finish |
|
Tensile Strength |
410 – 640 MPa (depending on grade) |
|
Yield Strength |
245 – 345 MPa |
|
Elongation |
≥ 20 % |
|
Straightness |
≤ 0.3 mm/m |
|
Hardness (HB) |
Typically ≤ 170 HB for normalized condition |
|
Tolerance |
OD ±1 %, WT ±10 %, length ±50 mm |
Heat Treatment Methods
The heat treatment methods for 8162 Structural Steel Pipes include normalizing, annealing, quenching, and tempering, which are applied as required to improve mechanical strength, toughness, and overall performance. The heat treatment methods for 8162 Structural Steel Pipes include:
• Normalizing – To refine the grain structure and improve mechanical strength.
• Annealing – To reduce hardness and enhance machinability.
• Quenching – To increase hardness and wear resistance.
• Tempering – To improve toughness and relieve internal stress after quenching.
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