Alloy steel tube spot material: 12Cr1MoVG, 12CrMoG, 15CrMoG, 12CR2MO< A335P22> And Cr5Mo & lt; A335P5> , Cr9Mo & lt; A335P9> , 10 cr9mo1vnb & lt; A335P91> , 15 nicumonb5 & lt; WB36>
Implementation standards GB5310-1995, GB6479-2000, GB9948...
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