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GB/T8162 Structure Carbon Seamless Steel Pipes Steel Grade/Steel Material/Steel Number: 10# 15# 20# 25# 35# 45# 20Mn 25Mn Q235 Q275 Q295 Q345 Q390 Q420 Q460 40Mn2 45Mn2 27SiMn 30Cr 35Cr 40Cr 45Cr 50Cr ...