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本文对从西德和日本进口的RST52钢管煨弯开裂原因进行了分析。结果表明:钢管在煨管机上弯曲成形时,由于加热不均均,使局部达到或接近熔化温度。采用氧-乙炔火焰加热时,由于乙炔过量或氧气不足,造成不完全燃烧,在高温下钢管表面局部强烈增碳,以致在随后的激冷过程中形成亚共晶组织和马氏体组织使表面局部塑性急剧下降,从而产生开裂。作者根据实际生产条件进行了模拟试验,证实了上述结论,并对西德和日本钢管进行了对比分析。根据试验分析结果提出了防止钢管煨弯开裂的措施。
This paper analyzes the causes of cracking of RST52 pipe imported from West Germany and Japan. The results show that when the steel tube is bent and shaped on the simmer tube machine, the local temperature reaches or approaches the melting temperature due to the uneven heating. Oxygen - acetylene flame heating, due to excessive acetylene or oxygen deficiency, resulting in incomplete combustion, the steel tube surface at high temperatures locally strong carbon, resulting in the subsequent chilling process to form hypoeutectic and martensite so that the surface Local plastic sharp decline, resulting in cracking. The author carried out the simulation test according to the actual production conditions, confirming the above conclusion and comparing the steel pipe in West Germany and Japan. According to the results of the experiment, the measures to prevent the steel tube from cracking during cracking are put forward.