DIN 1629 Seamless circular unalloyed steel tubes subject din 1629 st 52 0 astm
DIN 1629 Seamless circular unalloyed steel tubes subject to special requirements, EN 10216-1, ASTM A252, BS 4360, NF A 49-311, St52, 1.0421, E355, SA252 Grade 3, 50 B, TU 52-b, structural steel pipe, DIN 1629 St37, DIN 1629 St44, DIN 1629 St52
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