Grade: 10#, 20#, 35#, 45#, 16Mn, DIN 1629: St37.0, St44.0, St52.0
API 5L : A B X42 X46, X52, X60, X65, X70, X80.
Standard: GB/T8162, GB/T8163, ASTM A53, ASTM A106, DIN1629, API 5L.
ASTM A 106: GR. A, GR. B, GR. C
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