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Production method of high-strength steel

A production method and high-strength steel technology, applied in the field of steel rolling, can solve problems such as increased iron sheet adhesion, cold-rolled color difference defects, customer troubles, etc., to achieve the effect of reducing the incidence of color difference defects and improving the surface quality of products

Active Publication Date: 2019-06-25
SHOUGANG CORPORATION +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the addition of easily oxidizable alloy elements such as Si and Cr in DP and TRIP steel, a series of color difference problems will occur on the surface, such as increased adhesion of iron sheet, red iron sheet residue is not pickled and then inherited to cold-rolled finished products, manifested as Strip color difference after pickling leads to color difference defects in cold rolling, etc.
This directly limits the use of the steel plate as a visible part, becoming a bottleneck and causing trouble for customers

Method used

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  • Production method of high-strength steel
  • Production method of high-strength steel
  • Production method of high-strength steel

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Experimental program
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Effect test

Embodiment 1

[0053] The steel composition design is shown in Table 1 below. The composition design only adopts the Si-Cr-Mo composition system. The Si element content is as high as 0.2%, the Cr element is controlled at 0.5%, and the Mo element is controlled at 0.2%. At the same time, an appropriate amount of P element is added to 0.03 %, the formulated hot rolling process route is shown in Table 2 below. The temperature of the hot rolling out of the furnace is controlled at 1180°C, and the time in the furnace is controlled at 170min. The finish rolling adopts double-pass descaling, the finish rolling inlet temperature is 1000°C, and the cooling water ratio between the three stands before the finish rolling is 50%. The opening ratio of roll gap water reaches 80%. At the same time, the rolling lubrication process was put into use, and the final rolling temperature was controlled at 910°C. The coiling adopts the front-end intensive cooling mode, the coiling temperature is controlled at 580°C...

Embodiment 2

[0059] The steel composition design is shown in Table 3 below. The composition design only adopts the Si-Cr-Mo composition system. The Si element content is as high as 0.2%, the Cr element is controlled at 0.2%, and the Mo element is controlled at 0.5%. At the same time, an appropriate amount of P element is added to 0.02 %, the formulated hot rolling process route is shown in Table 4 below. The temperature of the hot rolling out of the furnace is controlled at 1190°C, and the time in the furnace is controlled at 180min. The finishing rolling adopts double-pass descaling, the finishing rolling inlet temperature is 990°C, and the cooling water ratio between the three stands before the finishing rolling is 50%. The opening ratio of roll gap water reaches 80%. At the same time, the rolling lubrication process was put into use, and the final rolling temperature was controlled at 900°C. The coiling adopts the front-end ultra-fast cooling mode, the coiling temperature is controlled...

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Abstract

The invention discloses a production method of high-strength steel. Steel components are designed. Specifically, the element Si is added for strengthening, after heating, an anchor pinning shape appears on an adding interface, FeO wraps Fe2SiO4 to be immersed into a steel matrix, the maximum pinning depth can reach 50 micrometers, the adhesive power of an inner iron sheet is good, and matrix falling off is not prone to happening. Cr and Mo are also added, and the shape of the net-shaped iron sheet with the Si content being reduced is weakened. Due to adding of the element Mo, a Mo element enrichment zone exists on the matrix interface. The element Mo hardly participates in forming of inner oxidization mass points, and the function of closing the oxidization interface is achieved. Through adding of the element P, the removal force of the iron sheet can be obviously improved. P is included in a Fe-Si-O system, the melting point of oxide of the system can be reduced, and therefore after the element P is added, the removal force of the iron sheet can be obviously improved, and the adhesive force of the iron sheet is reduced. By means of the production method, the technical problem of the color difference defect is solved, the occurrence rate of the color difference defect of a cold rolled plate can be effectively reduced, and therefore the product surface quality is improved.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a production method of high-strength steel. Background technique [0002] In the field of automobile manufacturing, auto parts have high demand for steel, including good strength, excellent formability, good corrosion resistance, weldability and coating performance. In addition to meeting safety requirements, high-strength steel also faces increasingly higher requirements for surface quality. High-strength steel is also gradually applied to visible parts. For example, 400MPa-level high-strength steel is used for doors and thresholds; 590MPa-level high-strength steel is used for door inner panels; 980MPa-1470MPa high-strength steel is used for inner panel reinforcements, etc. . [0003] However, due to the addition of easily oxidizable alloy elements such as Si and Cr in DP and TRIP steel, a series of color difference problems will occur on the surface, such as increased a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C22C38/02C22C38/22
Inventor 王畅于洋王林张亮亮高小丽刘文鑫王泽鹏张栋陈瑾吴耐焦会立张嘉琪商光鹏韩乐李晓军
Owner SHOUGANG CORPORATION
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