toughness grade of hull-structural steel 船体结构钢韧性等级
The strength and toughness of super fine grain steels are greatly increased because of its micrometer or sub micrometer grade grain size.
超细晶粒钢依靠生成微米级或亚微米级的铁素体，使钢的强度和韧性大大提高。
As the steel grade improved, the requirements for toughness and weldability are also enhanced.
随着管材强度级别的提高，对管材的韧性、焊接性等性能要求也进一步提高。
Fine grain grade with high hardness and high toughness.
具有高硬度和高韧性，晶粒度为细级别的牌号。
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