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638B

 

WYJ004-2006                             638B

To further improve  the object quality of the steel alloy I, meet the needs of the market, according to the needs of the user, now the 638 B in the WYJ042-2005  B steel supply technical conditions of [Mo] adjustment of 0.20 ~ 0.50, the relevant units in the files at the date of issue, according to the execution.

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