1.Standard: GB5310-2008, GB6479-2000, ASTM, ST45.8-111, DIN 17175,GB8163-2008, GB9948-2006, GB8162-2008 2.Carbon Material: 20#, 35#, 45#, CK45, ST45, ST55, SA106B 3.Alloy Material: 15CrMoG, 12CrMoVG, ... ...
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