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。
The strength and toughness of super fine grain steels are greatly increased because of its micrometer or sub micrometer grade grain size.
超細(xì)晶粒鋼依靠生成微米級(jí)或亞微米級(jí)的鐵素體，使鋼的強(qiáng)度和韌性大大提高。