Seamless Steel Pipe

High-quality seamless steel pipes for oil and gas transmission, structural applications, and high-pressure environments

Technical Specifications

Outer Diameter

8mm - 720mm

Wall Thickness

1mm - 120mm

Tolerance

Cold-drawn pipe: OD > 30–50 mm: ±0.3mm,; ≤30 mm: ±10%; Hot-rolled pipe: OD > 219mm:: ±1.0%, wall thickness > 20 mm: ±10%

Grade	C	Yes	Mn	P	S	Cr	No	Cu
10#	0.07～0.14%	0.17～0.37%	0.35～0.65%	≤0.035%	≤0.035%	≤0.15%	≤0.25%	≤0.25%
20#	0.17～0.24%	0.17～0.37%	0.35～0.65%	≤0.035%	≤0.035%	≤0.25%	≤0.25%	≤0.25%
Q345	0.12～0.20%	0.20～0.55%	1.20～1.60%	≤0.045%	≤0.045%

Grade	Tensile Strength	Yield Strength	Elongation
10#	335–475 MPa	≥205 MPa	≥24%
20#	410–550 MPa	≥245 MPa	≥20%
Q345	490–665 MPa	≥325 MPa	≥21%

GB/T 8163: General seamless steel pipes for conveying fluids such as water, oil, and gas
GB/T 8162: Manufacturing of pipes, vessels, equipment, and mechanical structural components
GB/T 3087: Heat exchange tubes for low and medium pressure boilers
GB/T 5310: Heat transfer tubes, headers, superheaters, etc. for high-pressure boilers (working pressure ≥9.8MPa, operating temperature 450℃～650℃)
Engineering & Structures: Bridges, High-rise Buildings, Industrial Structural Supports, Underground Pipelines, Groundwater Extraction
Machinery Manufacturing: Oil Drill Pipe, Automotive Drive Shafts, Bicycle Frames and Components

Versatile for diverse industrial applications
Hot-rolled outer diameter is typically greater than 32 mm, with a wall thickness of 2.5-200 mm.
Cold-rolled outer diameter up to 6mm, wall thickness down to 0.25mm
Excellent mechanical and machinability properties