Cold-drawn steel pipe is a precision cold-drawn seamless pipe with high dimensional accuracy and good surface finish for mechanical structure and hydraulic equipment. Compared with steel, cement and other pipe products, PE pipe performance advantages are more prominent, so at present in China's water supply and drainage projects, has been widely used and widely used. In water supply and drainage engineering, PE pipe is affected by the natural environment and engineering characteristics, and its application process needs to be optimized and improved continuously. In this paper, the application of PE pipe in municipal water supply and drainage engineering in northern coastal areas is analyzed. Selection of precise seamless pipe manufacturing mechanical structure or hydraulic equipment, etc., can greatly save machining time, improve material utilization, while improving product quality.
If you want to get smaller size and better quality seamless pipe, must use cold rolling, cold drawing or combination of the two methods. Cold rolling is usually carried out on a two-high mill. The steel pipe is rolled in a ring pass consisting of a variable section circular groove and a stationary conical plug. Cold drawing is usually carried out on a single chain or double chain cold drawing machine of 0.5 ~ 100T.
High quality carbon structural steel cold-drawn seamless pipes are mainly made of No. 10 and No. 20 steel. In addition to ensuring chemical composition and mechanical properties, hydrostatic tests, edge rolling, flattening and other tests are required.
冷拔钢管的常用规格：12mm 14mm 18mm 20 mm 25mm 28mm 30mm 32mm 35mm 38mm 40mm 42mm 52mm
Commonly used specifications for cold drawn steel pipes: 12mm 14mm 18mm 20 mm 25mm 28mm 30mm 32mm 35mm 38mm 40mm 38mm
Theoretical formula for cold drawn steel tube
Steel tube weight formula: (outer diameter wall thickness) * wall thickness *0.02466=kg/ m (weight per meter)
Dimensions and allowable deviation of cold drawn steel tubes
Allowable deviation of standardized outside diameter
1.5%, minimum 0.75 mm
1%. Minimum 0.50 mm
0.75%. minimum 0.30 mm
0.50%. Minimum 0.10 mm
Mechanical properties of cold drawn steel tube
Mechanical properties of steel is an important index to ensure the ultimate performance of steel, which depends on the chemical composition of steel and heat treatment system. In the steel pipe standard, according to different application requirements, the relevant reports of China Steel Pipe Information Port are stipulated: tensile properties (tensile strength, yield strength or yield point, elongation), hardness and toughness, as well as high and low temperature properties required by users.
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