Microstructure and properties of low temperature steel for ultra large liquefied petroleum gas carrier
XIAO Da-heng1, TANG Wei1, LUO Deng1, WANG Zhen1, XIE Zhen-jia2, SHANG Cheng-jia2
1. Technical Quality Department, Hunan Valin Xiangtan Iron and Steel Co., Ltd., Xiangtan 411101, Hunan, China; 2. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
Abstract：In order to meet the construction of ultra large liquefied petroleum gas carrier,the development of LT-FH32 low temperature steel for ultra large liquefied petroleum gas carrier with niobium and titanium composite microalloying,controlled rolling and controlled cooling technology were introduced. Microstructure evolution and mechanical properties were investigated systematically. Results from CCT curves suggested that when cooling rate was slower than 3 ℃/s,polygonal ferrite and pearlite was obtained in the studied LT-FH32 steel. While,multi-phase microstructure consisting of polygonal ferrite and bainite was obtained in wide range of cooling rate from 5 to 15 ℃/s. When cooling rate was 20 ℃/s,lath bainite was obtained. The developed LT-FH32 steel plates with 10 and 34 mm thickness consisted of polygonal ferrite and bainite. The two multi-phase microstructure steel plate exhibited similar mechanical properties from both sides of transverse and longitude. The yield strength was from 390 to 413 MPa,tensile strength was from 485 to 521 MPa,impact energy at -80 ℃ was higher than 200 J and DBTT was -100 ℃.
肖大恒, 汤伟, 罗登, 王振, 谢振家, 尚成嘉. 超大型液化石油气船用低温钢组织性能[J]. 钢铁, 2020, 55(4): 82-87.
XIAO Da-heng, TANG Wei, LUO Deng, WANG Zhen, XIE Zhen-jia, SHANG Cheng-jia. Microstructure and properties of low temperature steel for ultra large liquefied petroleum gas carrier. Iron and Steel, 2020, 55(4): 82-87.
[1] Petch N. The ductile-brittle transition in the fracture of α-iron:I[J]. Philosophical Magazine,1958,3(34):1089. [2] 翁宇庆. 超细晶钢:钢的组织细化理论与控制技术[M]. 北京:冶金工业出版社,2003. (WENG Yu-qing. Ultrafine Grain Steel:Microstructure Refinement Theory and Control Technology of Steel[M]. Beijing:Metallurgical Industry Press,2003.) [3] 王红涛,田勇,叶其斌,等. 极寒环境下厚规格船舶用钢的发展[J]. 轧钢,2018,35(5):48. (WANG Hong-tao,TIAN Yong,YE Qi-bin et al. Development of heavy ship plate in extremely cold environment[J]. Steel Rolling,2018,35(5):48.) [4] 王璐,孙玉福,赵靖宇,等. 铌对低温钢组织及性能的影响[J]. 钢铁,2012,47(6):64. (WANG Lu,SUN Yu-fu,ZHAO Jing-yu, el al,Effect of niobium on microstructure and properties of cryogenic steels[J]. Iron and Steel,2012,47(6):64) [5] 郑健,邓想涛,王昭东,等. Nb元素对低合金耐磨钢组织性能的影响[J]. 轧钢,2018,35(2):12. (ZHENG Jian,DENG Xiang-tao,WANG Zhao-dong,et al. Effect of niobium on the microstructure and mechanical properties of the low alloy abrasion resistant steel[J]. Steel Rolling,2018,35(2):12.) [6] 王博,李铸铁,伊萨耶夫·欧列格,等. 利用Zr-Ti复合脱氧技术生产低温压力容器钢[J]. 钢铁,2018,53(2):67. (WANG Bo,LI Zhu-tie,Isayev Oleg,et al. Development of low temperature pressure vessel steel by Zr-Ti combined deoxidization technology[J]. Iron and Steel,2018,53(2):67.) [7] LIU S,LI X,GUO H,et al. Isolating contribution of individual phases during deformation of high strength-high toughness multi-phase pipeline steel[J]. Materials Science and Engineering:A,2015,639:131. [8] YUAN S,SHANG C,XIE Z,et al. Impact of intercritical annealing on retained austenite and toughness of a 460 MPa grade multiphase heavy gauge plate steel[J]. Steel Research International,2018,89(12):1800006. [9] 周成,赵坦,朱隆浩,等. TMCP工艺对低碳Ni-Nb钢组织转变和力学性能的影响[J]. 钢铁,2019,54(4):68. (ZHOU Cheng,ZHAO Tan,ZHU Long-hao,et al. Effect of TMCP on microstructure evolution and mechanical properties of low-carbon Ni-Nb steel[J]. Iron and Steel,2019,54(4):68.) [10] 刘健,侯振伟,师仲然. 焊接热输入对Nb-Ti钢CGHAZ组织韧性影响[J]. 中国冶金,2019,29(7):32. (LIU Jian,HOU Zhen-wei,SHI Zhong-ran. Effect of welding heat input on CGHAZ microstructures and toughness of Nb-Ti steel[J]. China Metallurgy,2019,29(7):32.) [11] 王毓男,蒋晓放. 大线能量焊接用海工钢的夹杂物与组织[J]. 钢铁,2019,54(8):209. (WANG Yu-nan,JIANG Xiao-fang. Investigation on inclusions and microstructure of offshore steel for high heat input welding[J]. Iron and Steel,2019,54(8):209.) [12] 高海亮,武会宾,岳峰,等. E36高强度船板钢的开发[J]. 河南冶金,2008,16(5):12.(GAO Hai-liang,WU Hui-bin,YUE Feng,et al. Development of high strength ship plate steel E36[J]. Henan Metallurgy,2008,16(5):12.) [13] 李文兴,冯捷,翟晓毅. Nb微合金化高强度船板钢的生产实践[J]. 中国冶金,2005,15(9):23. (LI Wen-xing,FENG Jie,ZHAI Xiao-yi. Production practice of Nb micro-alloyed high strength ship plate steel[J]. China Metallurgy,2005,15(9):23.) [14] XIE Z J,SHANG C J,WANG X L,et al. Microstructure-property relationship in a low carbon Nb-B bearing ultra-high strength steel by direct-quenching and tempering[J]. Materials Science and Engineering:A,2018(727):200. [15] TANG S,LIU Z,WANG G,et al. Microstructural evolution and mechanical properties of high strength microalloyed steels:Ultra fast cooling(UFC) versus accelerated cooling(ACC)[J]. Materials Science and Engineering:A,2013(580):257. [16] 尚成嘉,王学敏,杨善武,等. 高强度低碳贝氏体钢的工艺与组织细化[J]. 金属学报,2003,39(10):1019.(SHANG Cheng-jia,WANG Xue-min,YANG Shan-wu,et al. Microstructure refinement process of high strength and low carbon bainite steel[J]. Acta Metallurgica Sinica,2003,39(10):1019.) [17] 齐俊杰,杨王玥,孙祖庆. 低碳钢过冷奥氏体形变过程超细铁素体的形成[J]. 金属学报,2002,38(9):897. (QI Jun-jie,YANG Wang-yue,SUN Zu-qing. Formation of ultrafine ferrite during super-cooling austenite deformation of low carbon steel[J]. Acta Metallurgica Sinica,2002,38(9):897.) [18] Jia Z,Misra R,O′malley R,et al. Fine-scale precipitation and mechanical properties of thin slab processed titanium-niobium bearing high strength steels[J]. Materials Science and Engineering:A,2011,528(22/23):7077. [19] Challa V,Zhou W,Misra R,et al. The effect of coiling temperature on the microstructure and mechanical properties of a niobium-titanium microalloyed steel processed via thin slab casting[J]. Materials Science Engineering:A,2014(595):143. [20] SUN X J,YUAN S F,XIE Z J,et al. Microstructure-property relationship in a high strength-high toughness combination ultra-heavy gauge offshore plate steel:The significance of multiphase microstructure[J]. Materials Science and Engineering:A,2017(689):212. [21] TANG C J,LIU S L,SHANG C J. Micromechanical behavior and failure mechanism of F/B multi-phase high performance steel[J]. Journal of Iron Steel Research,International,2016,23(5):489. [22] 聂文金,尚成嘉,关海龙,等. 铁素体/贝氏体(F/B)双相钢组织调控及其抗变形行为分析[J]. 金属学报,2012,48(3):298. (NIE Wen-jin,SHANG Cheng-jia,GUAN Hai-long,et al. Microstructure regulation and deformation resistance analysis of ferrite/bainite(F/B) duplex steel[J]. Acta Metallurgica Sinica,2012,48(3):298.) [23] 汤忖江,尚成嘉,夏佃秀,等. 铁素体/贝氏体多相组织钢硬化行为表征参数[J]. 钢铁研究学报,2019,31(6):7. (TANG Cun-jiang,SHANG Cheng-jia,XIA Dian-xiu,et al. Characterization parameters for strain hardening behavior of ferrite/bainite multi-phase steel[J]. Journal of Iron and Steel Research,2019,31(6):7.) [24] 牛延龙,刘清友,贾书君,等. X80 级高强低合金管线钢组织与冲击韧性[J]. 钢铁,2019,54(2):67. (NIU Yan-long,LIU Qing-you,JIA Shu-jun,et al. Microstructure and impact toughness of X80 grade high strength low alloy pipeline steel[J]. Iron and Steel,2019,54(2):67.)
2020, Vol. 55 
