IDENTIFY THE COUNTERFEIT THICK-WALLED SEAMLESS TUBE

(1) and inferior thick-walled seamless tube easy to fold. Fold is a thick wall seamless tube appearance of all sorts of line, this disadvantage is usually through the longitudinal of all commodities. Happens the cause of the folding and inferior manufacturers to seek high efficiency, is a big reduction, under a rolling occurs when folding, folding the goods will be crack after bending, thick-walled seamless tube strength decreased.

(2) and inferior thick-walled seamless tube appearance often has pitted surface. Pits because of groove wear lead to severe thick-walled seamless tube look irregular rugged faults. Because fake thick-walled seamless tube manufacturer to seek profits, often present the groove rolling the overruns.

(3) and inferior thick-walled seamless tube appearance prone to scarring. For two reasons: one is uneven and inferior thick-walled seamless tube goods raw materials, impurities. 2 it is false and inferior material manufacturer guide equipment simple, simple stick steel, these impurities after the roll bite prone to scarring.

4. Prone to crack and inferior material appearance, why is it blank is adobe, adobe air, adobe in the process of cooling because of the effect of thermal stress, cracks, after rolling there is crack.

5. Simple and inferior thick-walled seamless tube scratch, reason is false and inferior material manufacturer equipment simple, prone to burr, scratch thick-walled seamless tube appearance. The depth of the scratch a decline in the strength of the thick wall seamless tube.

6. No metallic luster and inferior thick-walled seamless tube, reddish, or similar iron colour, for two reasons: one is its billet is adobe. 2 it is false and inferior material of rolling temperature, their steel temperature is through visual inspection, so can’t according to the rules of austenitic area of rolling, the function of the thick wall seamless tube natural can’t up to standard.