The influence of pipe blank on the quality of seamless steel pipe
If the diameter of the pipe blank is too large or the ellipse is too large, the biting condition will become worse when piercing, and the internal fold will occur because of the too large compression of the pipe blank diameter.
Tight internal structure refers to shrinkage cavity and central porosity, accumulation of non-metallic inclusions, gas content, etc. The strictness of this requirement varies with the use of API 5L X52 Seamless Steel Pipe and the steel grade.
The most important thing is the surface quality of the pipe blank, because the tube blank will be brought to the seamless steel pipe of the product when it goes to any disabled City, and the place with the disability will frequently lead to stress concentration, and the disability will be deepened and lengthened through plastic deformation.
In conclusion, in order to produce high quality seamless steel pipe products, the first step is to control the quality of pipe blank.
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