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。
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.
本文針對包鋼原來生産的J55石油套琯沖擊靭性不足，晶粒粗大的問題開展研究。
etd.calis.edu.cn