Study on cracking cause and rolling process parameters of low carbon steel

When Q215 strip steel is used to coil square tube in iron and steel plant,serious cracking is easy to occur at bending point.In order to reduce the cracking rate of the steel pipe,the causes of the corner cracking of the steel pipe were analyzed from two aspects of the microstructure and the inclusi...

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Autores principales:	Xiaoyong LI, Lei ZHAO, Lin LEI, Yaxu ZHENG, Jie FENG, Zhihong GUO
Formato:	article
Lenguaje:	ZH
Publicado:	Hebei University of Science and Technology 2021
Materias:	steel making; low-carbon steel; steel pipe; cracking; microstructure; inclusion; cementite Technology T
Acceso en línea:	https://doaj.org/article/d6dd2385dd06499b957d95bd52371f61
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spelling	oai:doaj.org-article:d6dd2385dd06499b957d95bd52371f612021-11-23T07:08:47ZStudy on cracking cause and rolling process parameters of low carbon steel1008-154210.7535/hbkd.2021yx03011https://doaj.org/article/d6dd2385dd06499b957d95bd52371f612021-06-01T00:00:00Zhttp://xuebao.hebust.edu.cn/hbkjdx/ch/reader/create_pdf.aspx?file_no=b202103011&flag=1&journal_https://doaj.org/toc/1008-1542When Q215 strip steel is used to coil square tube in iron and steel plant,serious cracking is easy to occur at bending point.In order to reduce the cracking rate of the steel pipe,the causes of the corner cracking of the steel pipe were analyzed from two aspects of the microstructure and the inclusions in the steel pipe.The influence mechanism of the microstructure transformation on the cold deformation properties of medium-carbon and low-carbon steel was discussed.The reasonable hot rolling and cooling processes after rolling were formulated.The properties of the inclusions and microstructure in Q215 steel were analyzed by optical microscope and scanning electron microscope.The transformation point,CCT and TTT curves of Q215 steel were calculated by J Mat Pro software.The results show that the main reason for the cracking of the steel pipe is the existence of ter-tiary cementite precipitated along the ferrite grain boundary in the steel,which belongs to hard brittle phase and causes stress concentration at the grain boundary during bending deformation,and the secondary reason for the cracking is the existence of large-size sulfide inclusions more than 100 μm in the steel.By adjusting the hot rolling and cooling process parameters,the amount of tertiary cementite in the steel is significantly reduced,the amount of pearlite is increased,and the cracking rate of the steel pipe is significantly reduced.The research results provide a reference for preventing the processing cracking of Q215 and similar steel grades.Xiaoyong LILei ZHAOLin LEIYaxu ZHENGJie FENGZhihong GUOHebei University of Science and Technologyarticlesteel making; low-carbon steel; steel pipe; cracking; microstructure; inclusion; cementiteTechnologyTZHJournal of Hebei University of Science and Technology, Vol 42, Iss 3, Pp 287-295 (2021)
institution	DOAJ
collection	DOAJ
language	ZH
topic	steel making; low-carbon steel; steel pipe; cracking; microstructure; inclusion; cementite Technology T
spellingShingle	steel making; low-carbon steel; steel pipe; cracking; microstructure; inclusion; cementite Technology T Xiaoyong LI Lei ZHAO Lin LEI Yaxu ZHENG Jie FENG Zhihong GUO Study on cracking cause and rolling process parameters of low carbon steel
description	When Q215 strip steel is used to coil square tube in iron and steel plant,serious cracking is easy to occur at bending point.In order to reduce the cracking rate of the steel pipe,the causes of the corner cracking of the steel pipe were analyzed from two aspects of the microstructure and the inclusions in the steel pipe.The influence mechanism of the microstructure transformation on the cold deformation properties of medium-carbon and low-carbon steel was discussed.The reasonable hot rolling and cooling processes after rolling were formulated.The properties of the inclusions and microstructure in Q215 steel were analyzed by optical microscope and scanning electron microscope.The transformation point,CCT and TTT curves of Q215 steel were calculated by J Mat Pro software.The results show that the main reason for the cracking of the steel pipe is the existence of ter-tiary cementite precipitated along the ferrite grain boundary in the steel,which belongs to hard brittle phase and causes stress concentration at the grain boundary during bending deformation,and the secondary reason for the cracking is the existence of large-size sulfide inclusions more than 100 μm in the steel.By adjusting the hot rolling and cooling process parameters,the amount of tertiary cementite in the steel is significantly reduced,the amount of pearlite is increased,and the cracking rate of the steel pipe is significantly reduced.The research results provide a reference for preventing the processing cracking of Q215 and similar steel grades.
format	article
author	Xiaoyong LI Lei ZHAO Lin LEI Yaxu ZHENG Jie FENG Zhihong GUO
author_facet	Xiaoyong LI Lei ZHAO Lin LEI Yaxu ZHENG Jie FENG Zhihong GUO
author_sort	Xiaoyong LI
title	Study on cracking cause and rolling process parameters of low carbon steel
title_short	Study on cracking cause and rolling process parameters of low carbon steel
title_full	Study on cracking cause and rolling process parameters of low carbon steel
title_fullStr	Study on cracking cause and rolling process parameters of low carbon steel
title_full_unstemmed	Study on cracking cause and rolling process parameters of low carbon steel
title_sort	study on cracking cause and rolling process parameters of low carbon steel
publisher	Hebei University of Science and Technology
publishDate	2021
url	https://doaj.org/article/d6dd2385dd06499b957d95bd52371f61
work_keys_str_mv	AT xiaoyongli studyoncrackingcauseandrollingprocessparametersoflowcarbonsteel AT leizhao studyoncrackingcauseandrollingprocessparametersoflowcarbonsteel AT linlei studyoncrackingcauseandrollingprocessparametersoflowcarbonsteel AT yaxuzheng studyoncrackingcauseandrollingprocessparametersoflowcarbonsteel AT jiefeng studyoncrackingcauseandrollingprocessparametersoflowcarbonsteel AT zhihongguo studyoncrackingcauseandrollingprocessparametersoflowcarbonsteel
_version_	1718416913287086080

Study on cracking cause and rolling process parameters of low carbon steel

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