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Hot-dip galvanized high-strength IF steel for Ti series intermediate bulk container and manufacturing method thereof

A manufacturing method and hot-dip galvanizing technology, applied in the field of high-strength automotive steel, can solve the problems of high technical content and difficult production, etc.

Pending Publication Date: 2020-10-23
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This type of steel has high technical content and is difficult to produce

Method used

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  • Hot-dip galvanized high-strength IF steel for Ti series intermediate bulk container and manufacturing method thereof
  • Hot-dip galvanized high-strength IF steel for Ti series intermediate bulk container and manufacturing method thereof
  • Hot-dip galvanized high-strength IF steel for Ti series intermediate bulk container and manufacturing method thereof

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Embodiment Construction

[0023] 1. Smelting process

[0024] 1.1 KR desulfurization: KR hot metal desulfurization technology is adopted, and the final sulfur content after deep desulfurization is required to be within 0.002%. KR desulfurization is desulfurized by mechanical stirring, and desulfurizing agent is added to the molten iron, so that the sulfur in the desulfurizing agent and molten iron is produced in constant stirring The desulfurization reaction removes the sulfur content in the molten iron. After the desulfurization is completed, the desulfurization slag is completely removed to prevent the high-sulfur slag from being mixed into the converter to cause sulfur return. The temperature stability control of the molten iron in the furnace ensures that the temperature of the molten iron is above 1300°C, which is conducive to stabilizing the control of the converter smelting process and improving the hit rate of the converter end point temperature.

[0025] 1.2 Converter smelting:

[0026] Scrap...

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Abstract

The invention discloses hot-dip galvanized high-strength IF steel for a Ti series intermediate bulk container and a manufacturing method thereof. P, Si and Mn elements are appropriately added to an IFsteel substrate for solid solution strengthening so as to ensure strength; an Ti alloying element is added for eliminating interstitial atoms and achieving precipitation strengthening; and an appropriate amount of B element is added for inhibiting segregation of P at the grain boundary, thus, the relatively high percentage elongation after fracture and the relatively low yield ratio are ensured,and meanwhile the tensile strength is improved; and the manufacturing method achieves the yield strength of 220-280MPa, the tensile strength of 340-410MPa, the percentage elongation after fracture greater than or equal to 32% (tensile inspection: L0=80mm, b=20mm), n value greater than or equal to 0.17, and r value greater than or equal to 1.5 for a finished product by combining the ability and characteristics of production equipment, smelting and a continuous annealing technology through a 2250mm hot rolling mill, and a pickling continuous rolling mill, and ensures a relatively low yield ratioand a relatively good stamping performance.

Description

technical field [0001] The invention relates to the technical field of high-strength steel for automobiles, in particular to a hot-dip galvanized high-strength IF steel for Ti-based tonnage barrels and a manufacturing method thereof. Background technique [0002] With the development of industrial technology, energy and environmental issues have become major social issues, and the automobile industry is no exception. Therefore, in the structural performance of modern automobiles, reducing weight and consumption, reducing environmental pollution and improving safety have become research hotspots. Steel for automobiles is constantly developing towards higher strength, high-strength IF steel, bake-hardening steel, phosphorus (P) steel, high-strength low-alloy (HSLA) steel, dual-phase (DP) steel, composite phase (CP) steel, transformation-induced plasticity (TRIP) steel, etc. [0003] Because hot-dip galvanized ferroalloy products have good welding performance, coating perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14
CPCC22C38/002C22C38/004C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 王金超杨维宇张嘉华宿成宋文钟班兆东刘强
Owner BAOTOU IRON & STEEL GRP
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