A kind of heavy rail billet temperature control slow cooling device and control technology
A slow cooling device and steel slab technology, applied in the field of continuous casting technology, can solve problems such as the inability to achieve ultra-low hydrogen content control and reduce the hydrogen content of steel slabs, and achieve the effects of easy promotion and implementation, reliable implementation, and simple design
Active Publication Date: 2022-04-08
BAOTOU IRON & STEEL GRP
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Problems solved by technology
[0003] The purpose of the present invention is to overcome the defect that the existing rail steel production process cannot realize ultra-low hydrogen content control, provide a billet dehydrogenation device and control process that can effectively remove the hydrogen content of the rail steel billet, and further reduce the hydrogen content in the billet
Method used
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Embodiment 1
[0028] The chemical composition of the bainite rail U20MN2SICRNIMO produced by the process of the present invention is shown in Table 1.
[0029] Table 1 Chemical composition of U20MN2SICRNIMO / %
[0030]
[0031] The production process route is: KR hot metal pretreatment desulfurization - top and bottom double blowing converter - LF refining - VD refining - 280×380mm bloom continuous casting
[0032] Table 2 Slow cooling control parameters of slab
[0033]
[0034] The high-strength and high-toughness bainitic heavy-gauge steel rails produced by the method have a hydrogen content of less than 0.00005% in inspection billets, meeting the control requirements.
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The invention discloses a rail steel billet dehydrogenation device and a control process, and formulates a temperature control and slow cooling process system for heavy rail steel, including a medium carbon bainite rail steel temperature control slow cooling process curve and a high carbon pearlitic rail steel control system. Warm and slow cool process curve. The purpose of the invention is to overcome the defect that the existing rail steel production process cannot realize ultra-low hydrogen content control, and to further reduce the hydrogen content in steel slabs.
Description
technical field [0001] The invention relates to the technical field of continuous casting technology, in particular to a temperature-controlling and slow-cooling device and a control technology for a heavy rail billet. Background technique [0002] Hydrogen is a harmful element in steel. When the hydrogen content is greater than 2.5ppm, white spots may occur, which will significantly reduce the performance of the steel. Even if the hydrogen content in the steel is very low, even lower than 1.0ppm, the segregation of hydrogen in the steel will still form hydrogen-induced cracks and cause the steel to break. Due to the special conditions of use of steel rails, there are clear requirements for hydrogen content, and the hydrogen content in molten steel is required not to exceed 0.00025%, otherwise the hydrogen content in steel rails should not exceed 0.0002%. The rail dehydrogenation process is usually completed in the smelting process. Chinese patent number: CN107012298A discl...
Claims
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IPC IPC(8): C21D1/84C21D3/06
CPCC21D1/84C21D3/06
Inventor 谌智勇宋海辛广胜高勇王文义翁举杨乐张亭
Owner BAOTOU IRON & STEEL GRP