grain-size grade

基本解釋

The grain size grade is about 4-5 class, and that during the thickness the central is less half a class than the lateral.
薄板坯的晶粒度的大致范圍在4～5級(jí)，其中在厚度方向上薄板坯中心部位晶粒度比側(cè)部小半個(gè)等級(jí)。
To break down the eutectic carbide network of A-cast structure with grain size 4-5 grade, tensile strain of 60% is needed.
當(dāng)鑄志晶粒度力4～5級(jí)寸，破碎晶炭化物組織需要有60％以上的拉應(yīng)變。
CVN(Charpy V-notch) toughness and grain size number of J55 grade oil casings produced by Baotou Iron and Steel Company did not meet the reiative standards in the past.
本文針對(duì)包鋼原來生產(chǎn)的J55石油套管沖擊韌性不足，晶粒粗大的問題開展研究。
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