铌-钛微合金化中碳硼钢连铸坯的高温力学性能

特殊钢 ›› 2020, Vol. 41 ›› Issue (3): 67-71.

铌-钛微合金化中碳硼钢连铸坯的高温力学性能

王利军^1,2, 李永超^1,2, 王成杰^1,2, 阮士朋^1,2, 王宁涛^1,2, 张鹏^1,2

1邢台钢铁有限责任公司技术中心，邢台054027；
2河北省线材工程技术研究中心，邢台054027

收稿日期:2019-12-25 出版日期:2020-06-01 发布日期:2022-04-25
作者简介:王利军(1987-),男，硕士(2011年东北大学)，工程师,2009 年山东建筑大学(本科)毕业，线材研发和深加工研究。

High Temperature Mechanical Property of Casting Bloom of Nb-Ti Microalloying Medium-Carbon-Boron Steel

Wang Lijun^1,2, Li Yongchao^1,2, Wang Chengjie^1,2, Ruan Shipeng^1,2, Wang Ningtao^1,2 , Zhang Peng^1.2

1 Technology Center,Xingtai IRON & STEEL Co Ltd, Xingtai 054027 ；
2 Hebei Engineering Research Center for Wire Rod,Xingtai 054027

Received:2019-12-25 Published:2020-06-01 Online:2022-04-25

摘要/Abstract

摘要： 为了避免或减少铌-钛微合金化中碳硼钢320mm×280mm铸坯(%/:0.35C,0.04Si,0.87Mn,0.010P,0.007S,0.27Cr,0.031Alt,0.03Nb,0.030Ti,0.0018B,0.0046N)表面裂纹,研究了该钢种连铸坯的高温力学性能,并对高温拉伸断口和断口附近显微组织进行了观察。结果表明:在600～1250℃,试验钢在600℃时的断面收缩率为54.4%,其它测试温度点的断面收缩率均高于60%;试验钢第Ⅰ脆性区; 1200℃,第Ⅲ脆性区在750～850℃,在850～1200℃试验钢具有良好的热塑性;试验钢在800℃时具有相对偏低塑性,但拉伸断口微观下仍以韧窝形貌为主;试验钢在实际连铸生产时,采用≤1.0m/min铸速和≥950℃矫直温度,连铸坯表面质量良好。

Abstract: In order to avoid or reduce the surface cracks of 320 mm X 280 mm casting bloom of Nb-Ti microalloying of medium-carbon-boron steel(%/:0.35C,0.04Si,0.87Mn,0.010P,0.007S,0.27Cr,0.031Alt,0.03Nb,0.030Ti,0.0018B,0.0046N) ,the high temperature mechanical properties of the bloom are studied,and the microstructure near tensile fracture and impact fracture is observed. The results show that in the range of 600 to 1250℃, the reduction of area of the test steel at 600 °C is 54.4% ,and the that at other test temperature points is higher than 60 %. The I brittle zone of the test steel is higher than 1200℃ and HI brittle zone is 750 ~ 850 °C , and at 850 ~ 1200 °C the tested steel has better hot plasticity. The plasticity of tested steel is relatively low at 800 °C , but the tensile fracture is still dominated by dimpled morphology. The surface quality of continuous casting bloom is good in actual continuous casting production with casting speed ≤1.0 m/min and straightening temperature at 950℃

王利军, 李永超, 王成杰, 阮士朋, 王宁涛, 张鹏宁. 铌-钛微合金化中碳硼钢连铸坯的高温力学性能[J]. 特殊钢, 2020, 41(3): 67-71.

Wang Lijun , Li Yongchao, Wang Chengjie , Ruan Shipeng, Wang Ningtao, Zhang Peng. High Temperature Mechanical Property of Casting Bloom of Nb-Ti Microalloying Medium-Carbon-Boron Steel[J]. Special Steel, 2020, 41(3): 67-71.