Cold drawn precision welded pipe is a new type of high-tech energy-saving products. The promotion and application of high-precision cold drawn precision welded pipe has the advantages of saving steel, improving processing efficiency, saving energy, and environmental protection.
Compared with cold-drawn seamless tubes, cold-drawn precision welded tubes have better surface finish, roundness, straightness, and wall thickness difference than seamless tubes. On the billet, the welded pipe is manufactured by cold rolling of hot-rolled steel strip, while the seamless pipe is formed by piercing with round steel in the state of hot rolling.
The welded tube billet and the seamless tube billet formed in the hot-rolled state have obvious advantages in grain size and texture density. When the seamless tube billet is perforated, the round steel needs to be heated to more than 1100 ° C. There is no protective gas inner and outer surface The quality of a large number of oxidized surfaces is extremely unstable, and hot extrusion during the perforation process cannot guarantee the accuracy of the surface quality of the perforation. So that the cold drawn precision welded pipe has absolute advantages in terms of inner and outer diameter dimensions, mechanical properties, surface quality, wall thickness difference, etc. The production of cold drawn precision welded pipe cold rolled plate can ensure the wall thickness error ≤0.05mm, and the finished wall thickness difference ≤0.02mm To ensure that the mechanical properties of the steel pipe are more consistent, the inner and outer diameters of the finished product ≤0.03mm, and the surface roughness Ra≤0.3μm.
Due to the limitation of the perforation process, the seamless pipe cannot achieve multi-spec, small-caliber, thin-walled pipes, and due to the limitation of the single processing rate of the post-finishing, many product specifications require multiple cold drawing or cold rolling, cold drawn precision welded pipe The minimum thickness of the cold-rolled plate used can be 0.1mm, so the cold-drawn precision welded pipe can be selected according to the finished product specification and processing rate. The optimal welded pipe blank specification is completed in one cold drawing, reducing labor, energy and emissions.
Products are mainly used in industries such as automobiles, motorcycles, high-end furniture, construction machinery, fitness equipment, low and medium pressure fluids, etc. With the rapid development of modern straight seam welding technology and cold drawing technology, cold drawn precision welded pipe will gradually replace high cost, high energy consumption, high pollution, long production cycle, labor-intensive precision seamless steel pipe.
Precision welded steel pipe
Welded steel pipe refers to a steel pipe with a seam on the surface, which is formed by bending and deforming a steel belt or a steel plate into a round shape or a square shape. The blank used for the welded steel pipe is a steel plate or a strip steel.
Since the 1930s, with the rapid development of high-quality strip continuous rolling production and the improvement of welding and inspection technology, the quality of welds has been continuously improved, the variety and specifications of welded steel pipes are increasing, and the Seam steel pipe.
Cold drawn precision welded steel pipe
The optimization of the processing method of the blanks of precision cold-drawn welded tubes has greatly improved the quality of product size, wall thickness, roughness and mechanical properties. The number of processing passes can reduce energy consumption, protect the environment, reduce labor, and cold-draw High, product surface treatment process is environmentally friendly.