How to Distinguish the Advantages and Aisadvantages of Large Diameter LSAW Pipe

1. Poor appearance of steel surface often have Ma phenomenon.Mong surface is due to the groove caused by serious wear irregular steel surface irregularities defects. Due to the poor quality steel pipe manufacturers to pursue profits, often the most excessive rolling mill.
2. Low-quality steel pipe was oval cross-section, because large-diameter lsaw pipe manufacturers in order to save material, the finished product before the second roll reduction is too large, the strength of such rebar greatly reduced, but also does not meet the overall dimensions of rebar standard.
3. The composition of high-quality steel, cold shear high tonnage, cut end face smooth and neat, and inferior material due to poor quality, cut end face often have the phenomenon of meat, that is uneven, and no metallic luster. And because of inferior products manufacturers cut less head and tail will appear big ears.

4. Low-quality large-diameter lsaw pipe with impurities and more, the density of steel is too small, and serious size tolerance, so in the absence of vernier caliper, it can weigh it.

1. Low-quality steel pipe diameter size fluctuations, because: l, steel temperature instability. 2, the composition of steel is not uniform. 3, due to poor equipment, low foundation strength, rolling mill bounce. There will be a big change in the same week, so that uneven reinforcement force prone to fracture.
2. Low-quality steel pipe prone to folding. Folding is the surface of the pipe formed by the various polylines, this defect often runs through the longitudinal product. Collapse is due to the reasons for the production of low quality lsaw pipe manufacturers to pursue high efficiency, the reduction is too large, resulting in ears, the next roll when folding, folded product will crack after bending, straight seam pipe strength decline.
3. Quality control of the trademark and print are more standardized. Steel pipe diameter larger than 16 threads, the spacing between the two trademarks are IM above. Inferior steel rebar longitudinal tendons often wavy, inferior large diameter straight seam steel pipe manufacturers because there is no traffic, so the package is loose.
4. Low-grade steel surface easy to produce scarring for two reasons: (1). Poor quality stainless steel pipe, impurities and more. (2). Poor quality manufacturers guide equipment manufacturers simple, easy to stick steel, these impurities bite roll easy to produce scarring.
5. Poor surface of the material prone to crack, because its billet is adobe, adobe stomata, adobe in the cooling process due to the role of thermal stress, cracks, there are cracks after rolling.
6. Poor quality steel easy to scratch, because poor quality steel pipe factory equipment, easy to produce burrs, scratched steel surface. Deep scratches reduce the strength of the steel.
7. Poor quality steel pipe without metallic luster, pale red or pig iron-like color, because; l, its billet is adobe. 2, inferior material rolling temperature is not standard, their steel temperature is through visual inspection, so can not according to the provisions of the austenitic region of the rolling, the nature of the steel can not be achieved.
8. Low-quality steel horizontal and thin transverse bar, often filled with dissatisfaction phenomenon, because straight seam steel pipe manufacturers to achieve large negative tolerance, the first few Road, the finished product is too large, iron is too small, hole full of dissatisfaction.

A worker from a steel pipe company, which is located in China.