First of all, it may be due to the stress of the spiral welded steel pipe. That is, the residual stress and welding stress after the steel pipe is formed.Secondly, due to the presence of hydrogen. If the flux is not dried enough, the preheating temperature is insufficient or the p

THREEWAY STEEL API 5L/ASTM A106 GR.B Seamless Steel Pipe Price list Sep. 29th, 2021NO.Product NameOut Diameterwall thicknessFOB Tianjinwall thicknessFOB Tianjinmm(by bulk vessel)mm(by bulk vessel)1SMLS3/8"17.12.31US$1327.83/TON3.2US$1327.83/TON2SMLS1/2"21.32.77US$1211.55/TON3.73US$1211.55/TON3SML

1. Downhill forming methodDownslope shaping of welded pipe equipment can significantly reduce edge extension.2. Increase the intermediate extension of the billetDuring the forming process, the reduction of the hole pattern is increased, so that the gap between the upper and lower rolls is slightly s

Steel pipe piles are widely used in various situations such as supporting piles and friction piles. Especially when it is used as a supporting pile, it can be fully driven into a relatively hard supporting layer, so it can exert the bearing effect of the strength of the entire section of the steel.T