DIN 1629 St52 seamless carbon steel pipe 6"SCH40 DIN1629 St37.0,St44.0,St52. ... .8 EN10208 Gr. L245NB, DIN 1629 St52 seamless carbon steel pipe 6"SCH40 DIN1629 St37.0,St44.0,St52.0 ... St45.8 EN10208 Gr. L245NB,L290DIN 1629 St52 seamless carbon steel pipeOur company have been certified by the international ... is used in extracting petroleum & natural gas. casing pipe serves as wall of well.3, ASTM A106 For ...