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• Time of issue:2022-06-07
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(Summary description)1. Generally, carbon steel is a domestic seamless steel pipe provided according to the characteristics of the product organization. GB/T700-88A steel is selected (but the sulfur content must not exceed 0.050%, and the phosphorus content should not exceed 0.045%), and its mechanical properties should meet the The value required in the GB8162-87 table.

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2. The domestic seamless pipeline should be determined as the standard hydraulic test according to the hydraulic test.

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3. The technical performance inspection of imported seamless steel pipes shall comply with the relevant specifications stipulated in the contract.

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2. Main use 2.1. Seamless steel pipes are universal. Ordinary seamless steel pipe is cold-rolled from ordinary carbon alloy structural steel, low alloy tool steel or alloy tool steel.

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2.2. The products supplied according to the main purpose are divided into three categories: a, according to the composition and mechanical properties, b, according to the mechanical properties, c, according to the hydrostatic test. According to the seamless steel pipes provided by grades a and b, in order to better withstand the liquid pressure, a hydrostatic test must also be carried out.

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Special seamless steel pipes include seamless steel pipes for heating furnaces, seamless steel pipes for geological environments, and seamless steel pipes for crude oil.

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Third, type.

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According to the difference in production, seamless steel pipes can be divided into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes, extruded pipes, etc.

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According to the appearance design, it is divided into round tube, special-shaped tube, etc. In addition to square tubes and rectangular square tubes, there are also stainless steel round tubes, semi-circular tubes, triangular tubes, hexagonal tubes, convex tubes, plum blossom tubes, etc.

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According to the different raw materials, it is divided into ordinary carbon structural pipe, alloy structural steel structural pipe, high-quality carbon structural pipe, aluminum alloy structural pipe, stainless steel pipe, etc.

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3.4. According to its unique main purpose, there are steam pipes, geological pipes, oil pipelines, etc.