Effect of Mg on inclusion and austenite grain size of X80 pipeline steel

doi:10.13251/j.issn.0254-6051.2022.10.012

Abstract

Abstract: Magnesium treatment and heat treatment were carried out on X80 steel in a laboratory, and the effect of Mg on inclusion and austenite grain size of the steel was analyzed. The results show that the content of calcium aluminate inclusion decreases and the content of MgO·Al₂O₃ inclusion increases in the steel after magnesium treatment. With the further increase of Mg content in the steel, MgO inclusions are formed, resulting in the decrease of MgO·Al₂O₃ content and Al₂O₃ content. Magnesium treatment has a little effect on the type and content of sulfide, carbide and nitrides in the steel. After magnesium treatment, the quantity percentage of small-sized inclusion is increased and the average size of inclusion is decreased in the steel. The main inclusion is MgO·Al₂O₃ with a size of less than 1 μm in the magnesium treated X80 steel after heat treatment, which has an effect of pinning grain boundaries, and significantly reduces the austenite grain size of the steel.

Key words: magnesium treatment, X80 pipeline steel, inclusion, austenite, grain size

CLC Number:

TF03⁺1

Tian Jun, Su Lijuan, Wu Jing, Huang Shenglong, Wang Deyong. Effect of Mg on inclusion and austenite grain size of X80 pipeline steel[J]. Heat Treatment of Metals, 2022, 47(10): 71-77.

References

[1]张圣柱, 程玉峰, 冯晓东, 等. X80管线钢性能特征及技术挑战[J]. 油气储运, 2019, 38(5): 481-495.
Zhang Shengzhu, Cheng Yufeng, Feng Xiaodong, et al. Performance characteristics and technical challenges of X80 pipeline steel[J]. Oil and Gas Storage and Transportation, 2019, 38(5): 481-495.
[2]李强, 赵家七, 蔡小锋, 等. 管线钢钙处理工艺优化[J]. 炼钢, 2019, 35(5): 37-42.
Li Qiang, Zhao Jiaqi, Cai Xiaofeng, et al. Optimization of calcium treatment process for pipeline steel[J]. Steelmaking, 2019, 35(5): 37-42.
[3]罗磊, 孙彦辉, 陈永, 等. 钙处理工艺对管线钢非金属夹杂物的影响[J]. 钢铁, 2013, 48(1): 42-45.
Luo Lei, Sun Yanhui, Chen Yong, et al. Effect of calcium treatment on the non-metallic inclusions of pipeline steel[J]. Iron and Steel, 2013, 48(1): 42-45.
[4]Li M, Li S, Ren Y, et al. Modification of inclusions in linepipe steels by Ca-containing ferrosilicon during ladle refining[J]. Ironmaking and Steelmaking, 2020, 47(1): 6-12.
[5]尹娜, 景财良, 李强, 等. X80管线钢精炼过程中夹杂物行为研究[J]. 炼钢, 2013, 29(4): 49-52, 66.
Yin Na, Jing Cailiang, Li Qiang, et al. Study on inclusion behavior in X80 pipeline steel during secondary refining process[J]. Steelmaking, 2013, 29(4): 49-52, 66.
[6]王新华, 李秀刚, 李强, 等. X80管线钢板夹杂物中串条状CaO-Al₂O₃系非金属夹杂物的控制[J]. 金属学报, 2013, 49(5): 553-561.
Wang Xinhua, Li Xiugang, Li Qiang, et al. Control of string shaped non-metallic inclusions of CaO-Al₂O₃ system in X80 pipeline steel plates[J]. Acta Metallurgica Sinica, 2013, 49(5): 553-561.
[7]Ito Y I, Nara S, Kato Y, et al. Shape control of alumina inclusions by double calcium addition treatment[J]. Tetsu to Hagane, 2007, 93(5): 355-361.
[8]杨清, 张立文, 张驰, 等. 低碳Nb-V-Ti微合金钢X70的奥氏体晶粒长大行为[J]. 金属热处理, 2019, 44(4): 1-5.
Yang Qing, Zhang Liwen, Zhang Chi, et al. Austenite grain growth behavior of low carbon Nb-V-Ti microalloyed steel X70[J]. Heat Treatment of Metals, 2019, 44(4): 1-5.
[9]乔桂英, 郭宝峰, 陈小伟, 等. 热循环对高铌管线钢焊接热影响区冲击韧性的影响[J]. 金属热处理, 2009, 34(12): 32-35.
Qiao Guiying, Guo Baofeng, Chen Xiaowei, et al. Influence of thermal cycle on impact toughness of HAZ of high-Nb pipeline steel[J]. Heat Treatment of Metals, 2009, 34(12): 32-35.
[10]陈延清, 杜则裕, 许良红. X80管线钢焊接热影响区组织和性能分析[J]. 焊接学报, 2010, 31(5): 101-104, 118.
Chen Yanqing, Du Zeyu, Xu Lianghong. Microstructure and mechanical properties of heat affected zone for X80 pipeline steel[J]. Transactions of the China Welding Institution, 2010, 31(5): 101-104, 118.
[11]雷玄威, 吴开明, 成林, 等. 改善高强韧管线钢焊接热影响区粗晶区韧性的现状与趋势[J]. 材料热处理学报, 2014, 35(5): 1-8.
Lei Xuanwei, Wu Kaiming, Cheng Lin, et al. Current status and trend on toughness improvement of coarse-grained heat-affected zone of high strength high toughness pipeline steels[J]. Transactions of Materials and Heat Treatment, 2014, 35(5): 1-8.
[12]Moon J, Lee C, Uhm S, et al. Coarsening kinetics of TiN particle in a low alloyed steel in weld HAZ considering critical particle size[J]. Acta Materialia, 2006, 54(4): 1053-1061.
[13]Moon J, Kim S, Lee J, et al. Limiting austenite grain size of TiN-containing steel considering the critical particle size[J]. Scripta Materialia, 2007, 56: 1083-1086.
[14]Fu J, Yu Y G, Wang A R, et al. Inclusion modification with Mg treatment for 35CrNi3MoV steel[J]. Journal of Materials Science and Technology, 1998, 14(1): 53-56.
[15]Yang J, Yamasaki T, Kuwabara M. Behavior of inclusions in deoxidation process of molten steel with in situ produced Mg vapor[J]. ISIJ International, 2007, 47(5): 699-708.
[16]田俊, 王德永, 屈天鹏, 等. Mg处理对X65管线钢中夹杂物的影响[J]. 炼钢, 2018, 34(5): 43-49.
Tian Jun, Wang Deyong, Qu Tianpeng, et al. Effect of magnesium treatment on inclusions in X65 pipeline steel[J]. Steelmaking, 2018, 34(5): 43-49.
[17]田俊, 王德永, 屈天鹏, 等. 钙、镁在含硫钢中硫化物变性过程中的作用[J]. 钢铁, 2017, 52(11): 27-31.
Tian Jun, Wang Deyong, Qu Tianpeng, et al. Role and distinction of Ca and Mg to sulfide modification for sulfur steel[J]. Iron and steel, 2017, 52(11): 27-31.
[18]Tsunekage N, Tsubakino H. Effects of sulfur content and sulfide-forming elements addition on impact properties of ferrite-pearlitic microalloyed steels[J]. ISIJ International, 2001, 41(5): 498-505.
[19]Maalekian M, Radis R, Militzer M, et al. In situ measurement and modelling of austenite grain growth in a Ti/Nb microalloyed steel[J]. Acta Materialia, 2012, 60(3): 1015-1026.
[20]Banerjee K, Perez M, Militzer M. Austenite grain growth kinetics during continuous heating of a microalloyed X-80 linepipe steel[J]. Materials Science Forum, 2012, 715-716: 292-296.
[21]黄源, 卫英慧. 20CrMnTi钢TiC的析出行为与奥氏体晶粒度及钢的淬透性[J]. 材料热处理学报, 1993, 14(1): 20-24.
Huang Yuan, Wei Yinghui. Influence of precipitation behavior of TiC phase on austenite grain size and hardenability in 20CrMnTi steel[J]. Transactions of Materials and Heat Treatment, 1993, 14(1): 20-24.
[22]Tomita Y, Saito N, Tsuzuki T, et al. Improvement in HAZ toughness of steel by TiN-MnS addition[J]. ISIJ International, 1994, 34(10): 829-835.
[23]Lai C T, Lai H H, Su Y, et al. The influence of Mg-based inclusions on the grain boundary mobility of austenite in SS400 steel[J]. Metals, 2019, 9(3): 370-384.
[24]Banerjee K, Militzer M, Perez M, et al. Non-isothermal austenite grain growth kinetics in the HAZ of a microalloyed X-80 linepipe steel[J]. Metallurgical and Materials Transactions A, 2010, 41: 3161-3172.
[25]Vynokur B B. Influence of alloying on the free energy of austenitic grain boundaries in steel[J]. Materials Science, 1996, 32: 306-314.