In the national economic construction, hot -rolled seamless steel pipes are an important type of steel door category. It is also an irreplaceable high -safety basic raw material for oil and gas drilling and equipment manufacturing.
The production process of hot -rolled seamless steel pipes has two typical characteristics. One is that the solid pipeline pore rolling process has a large deformed resistance. Generally, the forming process is required to complete the forming process at a higher deformation temperature than other hot -rolled steel; Cooling in the air, lack of effective cooling path control.
Inspection and cleanup of the surface defects of the tube blank
The surface defects on the tube (scarring, concave pits, grooves, cracks, etc.) generally use artificial naked eye (if there are special requirements, you need to use a non -destructive detection method) for inspection, and then clean the defects. In order to prevent missed inspection, the surface of the surface can also be checked and cleaned after the tube blank is picked or sprayed (sand spray).
The method of cleaning the surface defects of the tube is mainly flame cleaning, sand wheel grinding and cleaning and turning cleaning. For carbon steel pipe blanks with lack of cracks, cleaning flame cleaning; steel species with strong sensitivity, such as high alloy steel pipe blanks, sand wheel grinding and cleaning; some special steel species, such as stainless steel, corrosion -resistant alloy Tube blanks, etc., need to be cleaned by surface driving peeling.
The disadvantage is that the tube blank is cleaned up by the turbine or the grinding method of the wheel. The flame method is cleaned up, and the production efficiency is high, but the surface quality of the tube blanket is not as good as cleaning by turning or sand wheel grinding.
