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Production process for controlling metallographic structure formation in ferrite hot-rolling process

A technology of metallographic structure and production process, which is applied in the field of production process to control the formation of metallographic structure in ferrite hot rolling process, which can solve the problem of mixed crystal and grain deformation into cake structure, poor control of metallographic structure, etc. problem, to achieve the effect of reducing the amount of secondary oxide scale, excellent mechanical properties, and good metallographic structure and crystal form

Inactive Publication Date: 2019-01-25
RIZHAO STEEL HLDG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the metallographic structure existing in the existing ferrite rolling process is not easy to control, and it is easy to have mixed crystals and crystal grains deformed into cake-like structures, and to provide a method for controlling ferrite hot rolling process. The production process of metallographic structure formation has the advantage of eliminating the mixed crystal and cake-like structure of ferrite rolling and optimizing the mechanical properties of rolling by optimizing the ratio of raw materials and setting an appropriate process window according to the ratio of raw materials index

Method used

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  • Production process for controlling metallographic structure formation in ferrite hot-rolling process

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Embodiment 1

[0031] A production process for controlling the formation of metallographic structure in a ferrite hot rolling process is characterized in that the raw materials include by mass percentage: C is 0.045%; Si is 0.04%; Mn is 0.12%; P is 0.016%; S is 0.0012%; Alt is 0.012%; Cu is 0.02%; Cr is 0.02%; Ni≤0.01%, the rest is iron element; raw materials are smelted in converter, RH furnace and LF furnace in turn; raw materials are hot-rolled through ESP without end The thin slab continuous casting and rolling production line was completed. Molten steel passes through continuous casting machine, rough rolling mill, pendulum shear, scrap pushing, induction heating furnace, finishing mill, laminar flow cooling, high-speed flying shear and coiler in sequence. Among them, the continuous casting is produced at a constant speed of 5.0m / min, the rough rolling entrance temperature is 960°C, the induction heating furnace exit temperature is 1100°C, the finish rolling exit temperature is 770°C, t...

Embodiment 2

[0034] A production process for controlling the formation of a metallographic structure in a ferrite hot rolling process, characterized in that the raw materials include: 0.017% for C; 0.03% for Si; 0.09% for Mn; 0.015% for P; 0.0008%; Alt is 0.025%; Cu is 0.01%; Cr is 0.02%; Ni≤0.01%, the rest is iron element; raw materials are smelted in converter, RH furnace and LF furnace in turn; raw materials are hot-rolled through ESP without end The thin slab continuous casting and rolling production line was completed. Molten steel passes through continuous casting machine, rough rolling mill, pendulum shear, scrap pushing, induction heating furnace, finishing mill, laminar flow cooling, high-speed flying shear and coiler in sequence. Among them, the continuous casting is produced at a constant speed of 5.5m / min, of which the rough rolling inlet temperature is 950°C, the induction heating furnace outlet temperature is 1110°C, the finish rolling outlet temperature is 813°C, the coiling...

Embodiment 3

[0037] A production process for controlling the formation of metallographic structure in a ferrite hot rolling process is characterized in that the raw materials include by mass percentage: C is 0.008%; Si is 0.03%; Mn is 0.15%; P is 0.012%; S is 0.0010%; Alt is 0.025%; Cu is 0.02%; Cr is 0.02%; Ni≤0.01%, the rest is iron element; raw materials are smelted in converter, RH furnace and LF furnace in turn; raw materials are hot-rolled through ESP without end The thin slab continuous casting and rolling production line was completed. Molten steel passes through continuous casting machine, rough rolling mill, pendulum shear, scrap pushing, induction heating furnace, finishing mill, laminar flow cooling, high-speed flying shear and coiler in sequence. Among them, the continuous casting is produced at a constant speed of 5.2m / min, of which the rough rolling inlet temperature is 965°C, the induction heating furnace outlet temperature is 1160°C, the finishing rolling outlet temperatur...

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Abstract

The invention relates to a ferrite hot-rolling process, and in particular to a production process for controlling metallographic structure formation in the ferrite hot-rolling process. The raw materials comprises according to percentage by mass: less than or equal to 0.06 percent of C,less than or equal to 0.10 percent of Si, less than or equal to 0.30 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, less than or equal to 0.03 percent of Al, less than or equal to 0.05 percent of Cu, less than or equal to 0.05 percent of Cr, less than or equal to 0.05 percent of Ni and the balance of iron. The materials are sequentially smelted by a converter, a RH furnace and an LF furnace; and the material hot-rolling process can be carried out by a CSP orESP production line. By optimizing the proportion of the materials, a suitable process window is set according to the proportion of the materials in order to eliminate mixed crystal and caky structures in ferrite rolling and optimize the mechanical performance index of rolling.

Description

technical field [0001] The invention relates to a ferrite hot rolling process, in particular to a production process for controlling the formation of metallographic structure in the ferrite hot rolling process. Background technique [0002] With the development of thin slab continuous casting and rolling technology, the hot-rolled specifications are becoming thinner and thinner, and the hot-rolled specifications have the conditions to replace some cold-rolled specifications, but the thin specifications produced by the traditional hot-rolling process (austenitic zone rolling) It has the characteristics of fine metallographic structure and high strength, which is not conducive to replacing cold-rolled annealed steel plates. Therefore, ferrite rolling technology has become a research hotspot in major steel mills and research institutions. The ferrite rolling process has certain disadvantages, such as poor control of the metallographic structure, which is prone to mixed crystals...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C22C38/02C22C38/04C22C38/06C22C38/42C22C38/20
CPCC21D8/0205C21D8/0226C21D2211/005C22C38/02C22C38/04C22C38/06C22C38/20C22C38/42
Inventor 赵锐季长恩王刚闫磊张建胜赵寿云安宝林周扬收张若英陈良梁宗仁
Owner RIZHAO STEEL HLDG GROUP
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