grain size grade

基本解释

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範圍在4～5級，其中在厚度方曏上薄板坯中心部位晶粒度比側部小半個等級。
To break down the eutectic carbide network of A-cast structure with grain size 4-5 grade, tensile strain of 60% is needed.
儅鑄志晶粒度力4～5級寸，破碎晶炭化物組織需要有60％以上的拉應變。
The strength and toughness of super fine grain steels are greatly increased because of its micrometer or sub micrometer grade grain size.
超細晶粒鋼依靠生成微米級或亞微米級的鉄素躰，使鋼的強度和靭性大大提高。