通过两种成分非调质CT80连续油管用钢现场生产板卷工艺组织性能对比,分析了冷却速度、卷取温度、Mo和Nb元素含量等工艺参数对实验钢组织性能的影响。结果表明：当冷却速度由52℃/s提高到69℃/s后,铁素体形态为针状铁素体,实验钢屈服强度提高25 MPa;抗拉强度提高30 MPa。实验钢在530℃卷取时,组织中出现了3%的珠光体组织,抗拉强度低于性能指标10 MPa。而在400℃卷取时,组织中出现了3%的块状马氏体组织,使得屈服强度低于性能指标20 MPa;抗拉强度提高到690MPa。Mo元素含量提高,促进针状铁素体转变,实验钢淬透性提高,有利于获得M/A岛组织,保证获得高强度低屈强比性能。Nb元素含量提高,细晶强化和析出强化作用更明显。
The non-quenched and tempered CT80 grade coiled tubing steels with different composition were designed.Effects of cooling rate,coiling temperature and Mo and Nb content on microstructure and mechanical properties of the non-quenched and tempered CT80 steels were investigated.The results show that when cooling rate increases from 52 ℃/s to 69 ℃/s,acicular ferrite is obtained,and yield strength and tensile strength of the tested steel increase by 25 MPa and 30 MPa,respectively.When the coiling temperature is 530 ℃,pearlite is observed in the microstructure of the tested steel,and its tensile strength decreases by 20 MPa and yield strength increases to 690 MPa.The increase of Mo content is benefit of the formation of acicular ferrite and hardenability of tested steel,and martensite-austenite（M/A） islands increase in the microstructure.As the content of element Nb increases,it is favourable of grain refining sterngthening and precipitation strengthening of the steel.
参考文献
| [1] | 王少力,郑子元.连续油管国产化技术研究新进展[J].科技信息（科学·教研）,2008(18):359-360. |
| [2] | 章传国.连续油管的发展[J].宝钢技术,2007(02):26-29. |
| [3] | 彭在美,窦树柏,董帅,翁博,孙晓峰.连续油管国内外应用概况及国内的研制方向[J].焊管,2008(04):7-13. |
| [4] | 赵广慧,梁政.连续油管力学性能研究进展[J].钻采工艺,2008(04):97-101. |
| [5] | 李鹤林;郭生武;冯耀荣.高强度微合金管线钢显微组织分析与鉴别图谱[M].北京:石油工业出版社,2001 |
| [6] | 王伟,朱林,胡平,单以银,杨柯.针状铁素体管线钢的组织结构及其与力学性能的关系研究[J].焊管,2009(11):21-28,31. |
| [7] | 黎业生,赵明纯,单以银,杨柯.一种针状铁素体钢热轧板材的结构与力学性能[J].材料研究学报,2004(03):321-326. |
| [8] | 刘刚,曲占元.针状铁素体钢的力学性能与显微结构[J].材料开发与应用,2010(01):6-8. |
| [9] | 周乐育 .高强度含铌热轧双相钢组织性能柔性控制研究[D].北京科技大学,2008. |
| [10] | Pereloma E V;Bayley C;Boyd J D .Microstruetural evolution during simulated OLAC processing of a low-carbon micro alloyed steel[J].Materials Science and Engineering A,1996,210(01):16-24. |
| [11] | Lee W.B.;Hong S.G. .INFLUENCE OF Mo ON PRECIPITATION HARDENING IN HOT ROLLED HSLA STEELS CONTAINING Nb[J].Scripta materialia,2000(4):319-324. |
| [12] | Hiroyuki Motohashi;Naoto Hagiwara;Tomoki Masuda .Tensile properties and Microstructure of weld metal of X80 steel[J].Materials Science Forum,2003(Pt.5):4013-4018. |
| [13] | Kncissl A C;Garcia C I;Ardo A J de.Characterization of pricipitates in HSLA steel[A].Beijing:The Minerals,Metals and Materials Society,1992:316-319. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%