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Chongqing No. 35 seamless steel pipe knowledge
Chongqing No. 35 Seamless Steel Pipe: A Comprehensive Overview
No. 35 seamless steel pipe is a high-quality carbon structural steel widely used in various industrial applications, especially in mold production and mechanical manufacturing. It is manufactured from either a perforated steel tube or a solid billet through processes such as hot rolling, cold rolling, or cold drawing. This type of steel pipe plays a crucial role in China's steel industry.
According to incomplete data, there are approximately 240 manufacturers and 250 units producing seamless steel pipes in China, with an annual production capacity reaching about 4.5 million tons. In terms of size distribution, pipes with diameters below φ76 account for 35%, while those between φ159 and φ650 make up 25%. Regarding product types, general-purpose pipes dominate the market at 1.9 million tons (54%), followed by oil and gas pipes at 760,000 tons (5.7%). Hydraulic props, precision pipes, stainless steel pipes, bearing pipes, and automotive pipes together reach around 200,000 tons, accounting for 1.4% of the total output.
Standard specifications for No. 35 seamless steel pipes include GB8162-2008 for structural use, GB8163-2008 for fluid conveyance, GB3087-2008 for boiler applications, and GB5310-2008 for high-pressure boilers. Other standards cover chemical equipment, geological drilling, oil drilling, and more. Additionally, there are specific standards for alloy pipes such as 16Mn, 27SiMn, 15CrMo, 35CrMo, 12CrMov, 20G, 40Cr, 12Cr1MoV, and 15CrMo.
The weight calculation formula for seamless steel pipes is: [(Outer Diameter - Wall Thickness) × Wall Thickness] × 0.02466 = kg/m (weight per meter). This formula helps engineers and manufacturers estimate material costs and structural requirements accurately.
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