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范围在4～5级，其中在厚度方向上薄板坯中心部位晶粒度比侧部小半个等级。
To break down the eutectic carbide network of A-cast structure with grain size 4-5 grade, tensile strain of 60% is needed.
当铸志晶粒度力4～5级寸，破碎晶炭化物组织需要有60％以上的拉应变。
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.
本文针对包钢原来生产的J55石油套管冲击韧性不足，晶粒粗大的问题开展研究。
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