Spiral drill pipe: Cold-drawn forming a blade, anneal, good toughness, and durability.

螺旋钻杆：冷拉一次成型叶片，不退火，韧性好，耐用。

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This paper analyses the reasons of crack on the cold saw blade from Laigang Heavy H-Beam production line.

介绍了莱钢大型H型钢生产线冷锯锯片产生裂纹原因的研究与分析。

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In order to improve the cold fatigue, hot fatigue and mechanical fatigue resisting performance of the moving blade, grain refinement is required for the casting surface.

为了提高动叶片的抗冷热疲劳和抗机械疲劳的性能，铸件表面需进行晶粒细化。

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