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フランジの材質20mnは、最新基準の20#でしょうか?

2018-01-29View Original

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最新の規格ではフランジの20#材質が20mnに置き換わると聞いています。すでに徐々に一部の場所で使用が始まっているようですが、皆さん、これはどういうことでしょうか?

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