论文部分内容阅读
0 前言随着天然气的逐步推广使用,城市中对输送燃气的管道也提出了新的要求。用于输送天然气的管材必须具有良好的机械强度、抗震及气密性能等。钢管能承受较大的应力,塑性好,延伸率和抗冲击性能比较高,便于焊接,焊接钢管的焊缝强度接近于管材强度,能满足压力较高的情况下输送天然气的需要。另一方面,随着燃
0 Introduction With the gradual popularization and utilization of natural gas, the city also put forward new requirements on the pipeline for transporting gas. Pipe used for transporting natural gas must have good mechanical strength, seismic and gas tightness and so on. Steel pipe can withstand greater stress, good plasticity, elongation and impact resistance is relatively high, easy to weld, weld pipe strength close to the strength of the pipe, to meet the pressure of high gas transmission needs. On the other hand, with the burning