Hot Plasticity of Casting Slab of Nb-Ti Microalloying High Performance Steel Q370qE-HPS for Bridge Beam at 700-1050 ℃

Special Steel ›› 2015, Vol. 36 ›› Issue (5): 55-58.

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Hot Plasticity of Casting Slab of Nb-Ti Microalloying High Performance Steel Q370qE-HPS for Bridge Beam at 700-1050 ℃

Zhou Wen¹ , Wu Kaiming¹ , Wang Houxin² , Guo Aimin² , Zou Dehui³ , Li Shurui³

1. International Research Institute for Steel Technology, Wuhan University of Science and Technology, Wuhan 430081 ；
2. Microalloying Technology Center, CITIC-CCMM, Beijing 100004；
3. Research Institute, Wuhan Iron and Steel (Group) Corp, Wuhan 430080;

Received:2015-05-06 Online:2015-10-01 Published:2022-08-16

Nb-Ti微合金化高性能桥梁钢Q370qE-HPS铸坯700~1050 ℃的热塑性

周雯¹，吴开明¹，王厚昕²，郭爱民²，邹德辉³，李书瑞³

1. 武汉科技大学国际钢铁研究院，武汉 430081 ；
2. 中信微合金化技术中心，北京 100004；
3. 武汉钢铁(集团)公司研究院，武汉 430080;

作者简介:周雯(1989-)，女，硕士生(武汉科技大学)，2013年武汉科技大学(本科)毕业，金属材料相变与组织控制研究。
基金资助:
CITIC-CBMM 铌钢研究与开发基金资助(2014- D078-1)

Abstract

Abstract: With using Gleeble-1500D thermal/mechanical simulation testing machine, the hot plasticity of 230 mm x 1400 mm casting slab of developed high performance steel Q370qE-HPS for bridge beam (/% : 0.09C, 0.36Si, 1.33Mn, 0.013P, 0.004S, 0.036Nb, 0.015Ti, 0.022Als, 0.33CEV) at 700-1050℃ has been tested and studied. Results show that the high hot plasticity zone of high performance steel Q370qE-HPS for bridge beam is at 800-1050℃,as compared with traditional normalized steel Q370qE for bridge beam (/% : 0.14C, 0.38Si, 1.45Mn, 0.012P, 0.004S, 0.028Nb, 0.014Ti, 0.023Als, 0.38CEV) the high plasticity zone of steel Q370qE-HPS is larger j and the low plasticity of steel is at 700-800℃ , in this zone the ferrite lath formed at austenite grain boundaries has low tensile strength especially as the Nb-Ti carbo-nitrides exist grain boundaries, the crack and void form easily by charging stress led to deteriorate the hot plasticity of steel.

Key words: Nb-Ti Microdloying, Steel Q370qE-HPS for Bridge Beam, Casting Slab, Normalized Steel Q370qE, Hot Plasticity

摘要： 利用Gleeble 1500D热模拟试验机,对开发的Q370qE-HPS高性能桥梁钢（/%:0.09C，0.36Si，1.33Mn，0.013P，0.004S，0.036Nb，0.015Ti，0.022Als，0.33CEV）230 mm×1 400 mm连铸坯进行700~1050℃的热塑性试验研究。结果表明,Q370qE-HPS高性能桥梁钢800~1050℃为高塑性区间,与传统正火工艺桥梁钢Q370qE（/%:0.14C，0.38Si，1.45Mn，0.012P，0.004S，0.028Nb，0.014Ti，0.023Als，0.38CEV）相比较,Q370qE-HPS钢高塑性的温度范围较大;700~800℃为低塑性区间,在此区间沿奥氏体晶界析出的铁素体膜使抗拉强度降低,尤其当晶界处存在Nb-Ti碳氮化物时,应力作用下容易产生裂纹和孔隙,从而使钢的热塑性降低。

关键词: Nb-Ti微合金化, Q370qE-HPS桥梁钢, 连铸坯, 正火Q370qE钢, 热塑性

Zhou Wen , Wu Kaiming , Wang Houxin , Guo Aimin , Zou Dehui , Li Shurui. Hot Plasticity of Casting Slab of Nb-Ti Microalloying High Performance Steel Q370qE-HPS for Bridge Beam at 700-1050 ℃ [J]. Special Steel, 2015, 36(5): 55-58.

周雯, 吴开明, 王厚昕, 郭爱民, 邹德辉, 李书瑞. Nb-Ti微合金化高性能桥梁钢Q370qE-HPS铸坯700~1050 ℃的热塑性[J]. 特殊钢, 2015, 36(5): 55-58.

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Hot Plasticity of Casting Slab of Nb-Ti Microalloying High Performance Steel Q370qE-HPS for Bridge Beam at 700-1050 ℃

Nb-Ti微合金化高性能桥梁钢Q370qE-HPS铸坯700~1050 ℃的热塑性

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