... steel pipes & tubes 1.Standard:DIN,ASTM,API,GOST8731 2.Grade:st35.4,st37,A53/A106/API 5L-B 3 ... environment1. Factory covers an area of 80,000 square meters 2. Functional departments has a production department, quality inspection department, ... recreation room and so on. 3.Laboratory1. Has a sound detection equipment 2. Tensile testing machine / Chemical composition testing machine / Metallographic ...