Identify and Inferior Thick Walled Seamless Steel Pipe

Thick-walled seamless appearance often shoddy Pock phenomenon. Pock is due to badly worn groove surface irregularities caused by uneven thick-walled seamless steel pipe defects. Because of the thick-walled seamless steel pipe manufacturer and inferior to the pursuit of profit, often the most excessive rolling groove. Thick-walled seamless steel surface is easy to produce shoddy scarring. There are two reasons shoddy material unevenly thick-walled seamless steel pipe, impurities. Shoddy material manufacturers guide and guard the poorly equipped, easy to stick steel, easy to produce scarring after the roll bite of these impurities. Shoddy material surface is easy to crack, because it is blank adobe adobe many pores, the cooling process adobe due to thermal stress, cracks, cracking after rolling alone. Thick-walled seamless steel pipe shoddy easily scratched because of shoddy material manufacturers poorly equipped, easy to produce glitch, thick-walled seamless scratching the surface. Deep scratches reduce the intensity of seamless steel pipe. Thick-walled seamless steel pipe shoddy no metallic luster, pale red color of iron or similar reasons it is blank adobe. Shoddy-rolling temperature is not standard, they are visually steel temperature, so the area can not be specified by the austenitic rolling, thick-walled seamless performance naturally not reached. Thick-walled seamless steel cross bars shoddy thin and low, often sufficient dissatisfaction phenomenon, because manufacturers to achieve large negative tolerance, finished the first few tracks reduction is too large, iron-type small, hole filling dissatisfaction. Thick-walled seamless steel pipe shoddy oval cross section, because the manufacturers in order to save material, the first two tracks finished roll reduction is too large, the strength of this steel is greatly decreased, and does not comply with rebar Dimensions standard. Quality ingredients evenly thick-walled seamless, high-tonnage cold shear, cut the head face smooth and neat, and shoddy material due to the material is poor, there are often cut off the head end surface of the meat of the phenomenon, namely uneven, and no metallic luster. And because the wood product manufacturers cut shoddy little head, head and tail will be a big ears. Thick-walled seamless steel pipe with shoddy material impurities, the density of steel is small, and the size tolerance serious, so in case of the absence of a vernier caliper, check that it can be weighed. Generally the whole proportionate amount would be better, mainly taking into account the cumulative error and probability theory this problem. Shoddy walled seamless steel pipe inner diameter fluctuations due to the steel surface temperature instability of yin and yang. Steel composition uniform. Due to poor equipment, low intensity ground, bouncing big mill. There will be changes in the larger inner diameter of the same week, so easy to produce steel discontinuity fracture. Trademarks and print high-quality materials are relatively standardized. Three-walled seamless steel pipe diameter 16 or larger thread spacing between the two trademarks in IM or more. Shoddy thick-walled seamless steel longitudinal reinforcement often wavy. Since there is no thick-walled seamless steel pipe manufacturers shoddy road, so packed loose, side of the oval.