A method for improving strip structure of hot-formed steel sheet

A banded structure, hot-formed steel technology, applied in the field of iron and steel metallurgy and rolling, can solve problems such as bending and other performance degradation, uneven structure, uneven hardness distribution of steel plates, etc., to improve banded structure, fatigue and Improvement of performance such as welding and reduction of occurrence of banded structure defects

Active Publication Date: 2022-08-09
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of higher alloying elements such as carbon and manganese will inevitably lead to a certain level of banded structure in the microstructure of the steel. This type of structure will also lead to the inhomogeneity of the structure after heat treatment, resulting in the hardness distribution of the steel plate. Uneven, resulting in poor performance such as bending
[0004] At present, there is no systematic research on the banded structure of steel for hot stamping in China, so there is no optimal solution for the banded structure of hot-formed steel

Method used

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  • A method for improving strip structure of hot-formed steel sheet
  • A method for improving strip structure of hot-formed steel sheet
  • A method for improving strip structure of hot-formed steel sheet

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Experimental program
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Effect test

Embodiment 1

[0030] The chemical composition and mass percentage of the hot stamped steel in this embodiment are: C: 0.20%, Mn: 1.5%, Si: 0.15%, S: 0.005%, P: 0.022%, Al: 0.030%, RE: 0.1%, Ti: 0.03%, Cr: 0.40%, B: 0.005%, and the balance is iron and inevitable impurities.

[0031] The production process of the hot stamped steel in this embodiment includes hot metal desulfurization pretreatment, converter molten steel smelting, LF furnace molten steel refining treatment, continuous casting, hot continuous rolling, pickling and cold rolling, and continuous annealing. in:

[0032] (1) Hot metal desulfurization pretreatment: the S content at the outgoing station is 0.008%.

[0033] (2) Converter molten steel smelting: sedation time is 150s; converter tapping adopts slag detection and sliding plate slag blocking technology to control converter molten steel submerged slag < 2kg / t; ferromanganese, ferrosilicon, and ferrosilicon are added in sequence after one third of tapping. Aluminum is alloy...

Embodiment 2

[0041] The mass fractions of the chemical components of the hot stamped steel in this embodiment are: C: 0.45%, Mn: 1.0%, Si: 0.35%, S: 0.004%, P: 0.015%, Al: 0.050%, RE: 0.05%, Ti: 0.01%, Cr: 0.50%, B: 0.001%, and the balance is iron and inevitable impurities.

[0042] The production process of the hot stamped steel in this embodiment includes hot metal desulfurization pretreatment, converter molten steel smelting, LF furnace molten steel refining treatment, continuous casting, hot continuous rolling, pickling and cold rolling, and continuous annealing. in:

[0043] (1) Hot metal desulfurization pretreatment: the S content at the outgoing station is 0.010%.

[0044] (2) Converter molten steel smelting: sedation time is 140s; converter tapping adopts slag detection and sliding plate slag blocking technology to control converter molten steel submerged slag < 2kg / t; ferromanganese, ferrosilicon, Aluminum is alloyed and deoxidized.

[0045] (3) LF furnace molten steel refining t...

Embodiment 3

[0052] The mass fractions of the chemical components of the hot stamping steel in this embodiment are: C: 0.23%, Mn: 1.2%, Si: 0.25%, S: 0.003%, P: 0.017%, Al: 0.040%, RE: 0.01%, Ti: 0.06%, Cr: 0.40%, B: 0.003%, and the balance is iron and inevitable impurities.

[0053] The production process of the hot stamped steel in this embodiment includes hot metal desulfurization pretreatment, converter molten steel smelting, LF furnace molten steel refining treatment, continuous casting, hot continuous rolling, pickling and cold rolling, and continuous annealing. in:

[0054] (1) Hot metal desulfurization pretreatment: the S content at the outgoing station is 0.007%.

[0055] (2) Converter molten steel smelting: sedation time is 160s; converter tapping adopts slag detection and sliding plate slag blocking technology to control converter molten steel submerged slag <2kg / t; ferromanganese, ferrosilicon, Aluminum is alloyed and deoxidized.

[0056] (3) LF furnace molten steel refining...

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Abstract

The invention relates to a method for improving the band-like structure of a hot-formed steel sheet, which includes adjusting the chemical composition of the sheet and optimizing the sheet production process; wherein, adjusting the chemical composition of the sheet is specifically adding rare earth element RE into the sheet. In addition, by controlling the content of harmful elements, the purity of molten steel, the controlled rolling and controlled cooling process, and the cold rolling and annealing processes, the probability of band-like structure defects in hot-formed steel products is further reduced. Using the technical solution provided by the present invention can not only improve the purity of molten steel, refine the structure of the steel plate, but also reduce the occurrence of product band-shaped structure defects, and can meet the requirements of high-quality steel grades without adding additional equipment and processing means. .

Description

technical field [0001] The invention relates to a method for improving the strip structure of a hot-formed steel sheet, belonging to the technical field of iron and steel metallurgy and rolling. Background technique [0002] Steel for hot forming refers to steel sheets or strips used for direct and indirect hot stamping. Its original structure is ferrite and pearlite. After heat treatment, it is quickly stamped into martensite structure. It is a special high-strength steel obtained by heating the steel plate with a tensile strength level of about 600MPa at room temperature to a high temperature of about 950℃ and then rapidly cooling it. When this material is used in the car body, the bearing capacity is increased by 30% under the condition that the weight of the car body does not change much, so that the rigidity of the car reaches a new level, and it is widely used in car B-pillars, door sills and other anti-collision safety components. , which improves the crash safety o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/28C22C38/32C21D1/26C21D6/00C21D8/02C22C33/06
CPCC22C38/02C22C38/04C22C38/06C22C38/005C22C38/28C22C38/32C21D1/26C21D6/002C21D6/005C21D6/008C21D8/0205C21D8/0221C21D8/0247C22C33/06Y02P10/20
Inventor 齐建群牛佳彬杜雁冰杜明山张茜许强孟根巴根
Owner TANGSHAN IRON & STEEL GROUP
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