... passed the ISO9001:2000,ISO14001:2004 and CE/PED cert Seamless Steel PipesFeatures:1) Standards: GB/T14975, GB/T14976, GB13296-91, GB9948 ... ,GOST and so on 2) Our products are corrosion and high-temperature resistant3) The main standards are 304, 304L, 316, 316L ... the petroleum, smelting, foodstuff, power,papermaking, chemical, medical equipment, aviation, boiler heat exchanger, and other fields