Wuxi Beilai seamless steel pipe technical knowledge description
Seamless steel pipe produced by Wuxi Beilai is a tubular product made of metal billet through hot rolling, cold drawing or extrusion process, with continuous tube walls and no openings at both ends. Seamless steel pipe has the characteristics of high strength, good plasticity, high pressure resistance, corrosion resistance, etc., widely used in petroleum, chemical industry, electric power, shipbuilding, machinery manufacturing and other fields.
The following is a description of some technical knowledge of seamless steel pipes:
1. Material: The material of seamless steel pipe is mainly carbon steel, alloy steel, stainless steel and so on. Common carbon steel Q235, Q345, etc., alloy steel 16Mn, 20G, 40Cr, etc., stainless steel 304, 316, 321 and so on.
2. Production process: The production process of seamless steel pipe mainly includes hot rolling, cold drawing, extrusion and so on. The production process of hot-rolled steel pipe includes perforation, rolling, sizing, heat treatment, etc. The production process of cold drawn steel pipe includes pickling, cold drawing, heat treatment, straightening, etc. The production process of extruded steel pipe includes heating, extrusion, cooling, straightening and so on.
3. Size specifications: The size specifications of seamless steel pipe mainly include outer diameter, inner diameter, wall thickness, etc. Commonly used representation methods are DN (metric), inch (imperial), mm (mm) and so on. For example, DN20 means metric 20mm steel pipe, and 1 inch means imperial 25.4mm steel pipe.
4. Surface treatment: seamless steel pipe surface treatment mainly includes pickling, polishing, coating and so on. Pickling can remove the oxide on the surface of the steel pipe and improve the surface quality. Polishing can further improve the surface finish of the steel pipe; The coating can improve the corrosion resistance of the steel pipe.
5. Heat treatment: The heat treatment of seamless steel pipe mainly includes annealing, normalizing, quenching, tempering, etc. Heat treatment can improve the microstructure and mechanical properties of the steel pipe.
6. Inspection and acceptance: The inspection and acceptance of seamless steel pipe mainly includes appearance inspection, size inspection, chemical composition analysis, mechanical property testing, non-destructive testing, etc. Appearance inspection includes surface quality, shape, end quality, etc. Dimensional inspection includes outer diameter, inner diameter, wall thickness, etc. Chemical composition analysis is used to determine the material of the steel pipe; The mechanical properties test is used to check the strength, plasticity, toughness and so on. Non-destructive testing is used to find defects inside steel pipes.
In short, seamless steel pipe is an important industrial product with a wide range of application fields. Understanding its material, production process, size specifications, surface treatment, heat treatment and other related technical knowledge, help to better choose and apply seamless steel pipe.
