Shijiazhuang Steel Tel:
Classification of steel production methods
(1) Shijiazhuang Steel's manufacturing process can be divided into: hot rolled (extrusion), cold (pull), thermal expansion of these basic types of steel.
(2) Shijiazhuang Steel in accordance with the manufacturing process can be divided into: straight seam welded steel pipes, submerged arc welding steel pipes, butt welding pipe coils, pipe thermal expansion pipe.
1. Shoddy steel prone to collapse.
Folding is a variety of line pipe formed on the surface, this defect often throughout the product vertical. Have collapsed due to shoddy manufacturers to pursue high efficiency, reduction is too large, resulting in the ears, rolling to produce under a folded, folding the product after bending will crack down strength of steel.
2. Ma shoddy steel surface appearance of the phenomenon often.
Ma face is due to a serious cause Corrugated steel abrasion irregular uneven surface defects. Shijiazhuang Steel due to the pursuit of profit, most often excessive rolling groove rolling.
3. Steel surface is easy to produce fake scar.
There are two reasons:
(1). Inferior steel material is uneven, impurities.
(2). Shijiazhuang Steel guide and guard poorly equipped, easy to stick steel, these impurities after the roll bite is easy to produce scarring.
4. Inferior material surface easy to crack, because its stock is adobe, adobe pores, adobe in the cooling process due to thermal stress, resulting in cracks, after rolling through the cracks there.
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