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Help CenterSteel Pipe & Tube & Carbon Seamless Steel Pipe，10#、20#、35#、45#
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Steel Pipe & Tube & Carbon Seamless Steel Pipe，10#、20#、35#、45#NegotiableMOQ: 5 Metric Tons -
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1. Product Overview
Seamless carbon steel pipe is made of high-quality carbon structural steel, manufactured by hot rolling, cold rolling and cold drawing processes with no welded seam on the pipe body. It features uniform internal structure, high pressure resistance, high mechanical strength, good toughness and excellent machinability. As one of the most cost-effective and widely used industrial metal pipes, it is universally applied in various industrial supporting projects and fluid transportation systems.
2. Production Process
Hot Rolling ProcessRound steel billet → high-temperature heating → piercing → hot rolling forming → sizing and straightening → cooling → fixed-length cutting → finished product inspection.It covers a wide range of outer diameters and wall thicknesses, with stable performance and competitive cost, suitable for conventional engineering and general fluid delivery.
Cold Drawing & Cold Rolling ProcessHot-rolled pipe blank → pickling and rust removal → surface lubrication → cold forming → heat treatment → precision straightening → finishing cutting → strict quality inspection.This process ensures high dimensional accuracy, smooth surface finish and uniform wall thickness, ideal for precision machinery, high-pressure equipment and high-precision piping systems.
3. Common Materials & Chemical Composition
Common grades include 10# steel, 20# steel, 35# steel and 45# steel, complying with GB/T 699 standard.
10# Steel: Carbon 0.07~0.13%, Silicon 0.17~0.37%, Manganese 0.35~0.65%, Phosphorus ≤0.035%, Sulfur ≤0.035%
20# Steel (Most Popular): Carbon 0.17~0.23%, Silicon 0.17~0.37%, Manganese 0.35~0.65%, Phosphorus ≤0.035%, Sulfur ≤0.035%
35#/45# Steel: Higher carbon content, with higher hardness and structural strength, mainly used for mechanical structural parts.
4. Mechanical Properties
In accordance with national industry standards, all products pass strict mechanical performance tests:
10# Steel: Tensile Strength: 335~475MPa, Yield Strength ≥205MPa, Elongation ≥24%
20# Steel: Tensile Strength: 410~550MPa, Yield Strength ≥245MPa, Elongation ≥25%
35# Steel: Tensile Strength: 530~675MPa, Yield Strength ≥315MPa, Elongation ≥20%
5. Executive Standards
GB/T 8162-2018: Seamless steel pipes for structural purposes
GB/T 8163-2018: Seamless steel pipes for liquid service
GB/T 3087-2022: Seamless steel pipes for low and medium pressure boilers
GB/T 5310-2017: Seamless steel pipes for high pressure boilers
ASTM A106 / ASTM A53: International general standards for high-temperature carbon steel seamless pipes
6. Product Specifications
Hot-rolled seamless pipe: Outer diameter 32mm~630mm, wall thickness 2.5mm~75mm
Cold-drawn / cold-rolled seamless pipe: Outer diameter 6mm~219mm, wall thickness 0.25mm~14mm
Conventional length: 4m~12m, fixed length and multiple length customization are available as required.
7. Core Product Advantages
Integral seamless structure, outstanding pressure resistance and impact resistance, no leakage risk;
Good high temperature and low temperature resistance, stable performance in complex working conditions;
High roundness and concentricity, convenient for cutting, bending, welding and deep processing;
Stable chemical composition and mechanical properties, long service life;
Economical price and high cost performance compared with special alloy pipes.
8. Application Fields
Widely used in petrochemical industry, boiler power generation, hydraulic engineering, mechanical manufacturing, urban pipeline engineering, fire protection engineering, bridge construction and other fields.It is mainly used for conveying water, oil, gas, steam and other fluids, as well as mechanical structural parts, engineering support and high-pressure pipeline systems.
9. Surface Treatment & Packaging
Surface treatment: Black hot-rolled finish, bright cold-finished surface, pickled treatment, anti-rust oil coating, black paint coating and other optional treatments.
Packaging: Bundled with steel strips, pipe ends protected by plastic caps, moisture-proof and rainproof packaging. Custom marking, steel stamping and label sticking services are supported.
10. Quality Control & Testing
All products undergo strict factory inspection, including chemical composition analysis, tensile test, impact test, hardness test, hydrostatic pressure test, ultrasonic flaw detection, eddy current testing and dimensional appearance inspection, to ensure full compliance with international and national standards.
11. Delivery Cycle
Conventional spot specifications: 5-7 days;Custom special specifications and non-standard sizes: 7-15 days.
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