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金屬材料標(biāo)識(shí)的含義,請(qǐng)教 |
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點(diǎn)評(píng)
Q235的材質(zhì)就是我們經(jīng)常用的最普通的鋼材了吧,?不上火的那種吧,?它一般在圖紙上怎么標(biāo)識(shí)?軸承鋼的標(biāo)識(shí)是什么,?
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