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Method for improving banded structure of hot-formed steel plate

A strip-shaped structure, hot-formed steel technology, applied in the field of iron and steel metallurgy and rolling, can solve the problems of uneven hardness distribution of steel plates, poor bending and other properties, and uneven structure, so as to reduce the probability of strip-shaped structure defects. , Improve the effect of performance improvement such as band structure, fatigue and welding

Active Publication Date: 2021-12-07
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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  • Method for improving banded structure of hot-formed steel plate
  • Method for improving banded structure of hot-formed steel plate
  • Method for improving banded structure of hot-formed steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The chemical composition and mass percentage of the hot stamping steel in this example 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 unavoidable impurities.

[0031] The production process of hot stamping formed 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 continuous rolling, and continuous annealing processes. in:

[0032] (1) Desulfurization pretreatment of molten iron: the S content of the outbound station is 0.008%.

[0033] (2) Converter molten steel smelting: the calming time is 150s; converter tapping uses slag detection and sliding plate slag blocking technology to control the converter molten steel slag < 2kg / t; start to add ferromanganese, ferrosilicon, Aluminum is alloyed and deoxidized.

[0034] (...

Embodiment 2

[0041] The mass fractions of the chemical components of the hot stamping steel in this example 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 unavoidable impurities.

[0042] The production process of hot stamping formed 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 continuous rolling, and continuous annealing. in:

[0043] (1) Desulfurization pretreatment of molten iron: the S content of the outbound station is 0.010%.

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

[0045] (3) Refin...

Embodiment 3

[0052] The mass fractions of the chemical components of the hot stamping steel in this example 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 unavoidable impurities.

[0053] The production process of hot stamping formed 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 continuous rolling, and continuous annealing. in:

[0054] (1) Desulfurization pretreatment of molten iron: the S content of the outbound station is 0.007%.

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

[0056] (3) Refin...

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Abstract

The invention relates to a method for improving a banded structure of a hot-formed steel plate. The method comprises the steps of adjusting chemical components of the plate and optimizing the production process of the plate. The adjustment of the chemical components of the plate specifically comprises the step of adding a rare earth element RE into the plate. In addition, by controlling the content of harmful element components, the purity of molten steel, the controlled rolling and controlled cooling process, the cold rolling process and the annealing process, the generation probability of banded structure defects of the hot-formed steel product is further reduced. By adopting the technical scheme, the purity of molten steel can be improved, the structure of a steel plate can be refined, the generation of banded structure defects of a product can be reduced, and the requirements of high-quality steel types can be met without adding additional equipment and treatment means.

Description

technical field [0001] The invention relates to a method for improving the strip structure of a hot-formed steel sheet, which belongs to the technical field of iron and steel metallurgy and rolling. Background technique [0002] Steel for hot forming refers to the steel plate or steel strip used for direct and indirect hot stamping. Its original structure is ferrite and pearlite. After heat treatment, it is quickly stamped to form martensitic structure. That is to say, the steel plate with a tensile strength level of about 600MPa at room temperature is a special high-strength steel obtained by heating to a high temperature of about 950°C and then cooling rapidly. The yield strength is greater than 1000Mpa, and each square centimeter can withstand more than 10 tons of pressure. When this material is used on the car body, the bearing capacity is increased by 30% without much change in the weight of the car body, making the rigidity of the car reach a new level. It is widely u...

Claims

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Application Information

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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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