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Tips to identify seamless pipes
Sources: this site Click: Date: 2016-4-7 19:31:5
1, High-quality seamless pipes of uniform composition, high cold shear tonnage, smooth and neat end face of the cutting head, and inferior materials due to the poor material, cut the first end surface there are often off the meat of the phenomenon that is uneven, and no metallic luster. And because of inferior materials manufacturers cutting products less head, head and tail will be a big ears.
2, Inferior seamless pipes without metallic luster, pale red or similar color of pig iron, there are two reasons for it blank is adobe. Inferior-rolling temperature is not standard, they are visually steel temperature, so can not be carried out according to the provisions of the austenitic region of rolling, thick-walled seamless performance naturally can not be reached.
3, Thick-walled seamless Inferior material containing impurities, the density of steel is small, and size tolerance serious, so without a vernier caliper case, you can check it weighed.
4, Thick-walled seamless pipe inferior oval cross section, because manufacturers in order to save material, before two of the reduction of finished roll is too large, the strength of This steel is greatly decreased, and does not comply with rebar standard form factor.
5, Inferior thick-walled seamless surface is easy to produce scarring. There are two reasons: ① Inferior thick-walled seamless material uneven impurities. ② Inferior material manufacturers to guide and guard the poorly equipped, easy to stick steel, easy to produce these impurities bite roll scarring after.
6, Inferior material surface is easy to produce cracks because its blank is adobe, adobe many pores, adobe in the cooling process due to thermal stress, cracks, after after rolling there crack.
2, Inferior seamless pipes without metallic luster, pale red or similar color of pig iron, there are two reasons for it blank is adobe. Inferior-rolling temperature is not standard, they are visually steel temperature, so can not be carried out according to the provisions of the austenitic region of rolling, thick-walled seamless performance naturally can not be reached.
3, Thick-walled seamless Inferior material containing impurities, the density of steel is small, and size tolerance serious, so without a vernier caliper case, you can check it weighed.
4, Thick-walled seamless pipe inferior oval cross section, because manufacturers in order to save material, before two of the reduction of finished roll is too large, the strength of This steel is greatly decreased, and does not comply with rebar standard form factor.
5, Inferior thick-walled seamless surface is easy to produce scarring. There are two reasons: ① Inferior thick-walled seamless material uneven impurities. ② Inferior material manufacturers to guide and guard the poorly equipped, easy to stick steel, easy to produce these impurities bite roll scarring after.
6, Inferior material surface is easy to produce cracks because its blank is adobe, adobe many pores, adobe in the cooling process due to thermal stress, cracks, after after rolling there crack.
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