化学成分和控冷工艺对连续油管用钢带状组织的影响研究

Research of Effect of Chemical Component and Cooling Process on Bended Microstructure for Coiled Tubing

为了提高CT80连续油管的抗酸性能,对CT80钢带状组织和微区化学成分偏析进行了分析,研究了带状组织与微区化学成分偏析的对应关系及C含量和控冷工艺对带状组织的影响。结果表明,微区化学成分偏析是导致带状组织形成的根本原因;降低C含量或卷取温度,均可抑制CT80钢带状组织形成;当w(C)低至0.05%、卷取温度低至530℃时,带状组织基本消除,CT80钢抗酸性能良好。

In order to improve the acid resistance of CT80 coiled tubing,the banded microstructure and micro-area chemical component segregation of CT80 steel were analyzed,the relationship between banded microstructure and micro-area chemical component segregation and the effects of C content and cooling process on banded microstructure were studied.The results showed that micro-area chemical component segregation was the root cause of the formation of banded microstructure;reduction of C content or coiling temperature could inhibit the formation of CT80 steel banded microstructure;when the C content was as low as 0.05%,and the coiling temperature as low as 530℃,the banded microstructure was basically eliminated and the acid resistance of CT80 steel was good.