... of low, medium and high pressure boilerWe are the biggest steel pipe manufacturer in Shandong province,China. We have got two ... expand pipe. Also,we have got carbon steel pipe for liquid use (ASTM A106/A53GR.B), steel pipe for casing (P-110, K55 ... , N80 and so), steel pipe for pipeline (API5L GR.B, X42, X52, 60, X70), steel pipe ...