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Seamless steel pipe surface quality requirements
Dec 25, 2018

Seamless steel pipe is a relatively precise and economical section steel. It is mainly used in the manufacture of structural parts and mechanical parts, such as steel scaffolding for oil drills. The main feature of seamless steel pipes is that they have a hollow section and are used in large quantities as pipes for conveying fluids. Compared with solid steel such as round steel, the seamless steel pipe is lighter in weight when the bending and torsional strength are the same.


So, what kind of seamless steel pipe is a good product? First of all, there are strict requirements on the surface quality of the product. For example, in terms of surface finish, common defects include dangerous defects: cracks, inflection, outer folding, rolling, separation, crusting, concave, convex hull, etc.; and general defects: pit, blue line, stroke Injuries, bruises, slight internal and external straights, roller prints, etc.


The main reasons for these defects are: 1. There are surface defects or internal defects in the seamless steel pipe blank; 2. In the production process, if the rolling process parameters are not designed correctly, the mold surface is not smooth, and the lubrication conditions are not good. Hole design and adjustment are unreasonable; 3. In the process of heating, rolling, heat treatment and straightening, if the heating temperature is improperly controlled, the deformation is not uniform, the heating and cooling speed is unreasonable or the straightening deformation is too large. Large residual stresses may also cause surface cracks in the steel

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