Welded pipe that bended by hot bending method with a set of specific die and welded by plasma arc welding method was used as tubular blank of SPF.
采用焊管作为管坯 ，焊管弯曲采用专用模具热弯 ，焊接采用等离子弧焊。超塑成形采用多层模结构 ，用模具来控制波形。
The effect of hot bending and heat treatment thermal cycles on the mechanical properties of X80 grade steel pipe was evaluated.
通过焊接热模拟试验和冲击韧性试验，研究了不同预热温度对X80级管线钢组织性能的影响。
The effect of hot bending and heat treatment thermal cycles on the mechanical properties of X80 grade steel pipe was evaluated.
通过焊接热模拟试验和冲击韧性试验，研究了不同预热温度对X80级管线钢组织性能的影响。
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