Extra-deep drawing interstitial free steel and production method thereof

A technology of interstitial-free steel and ultra-deep drawing, which is applied in the field of smelting hot-rolled pickled strip steel for automobiles, can solve the problems of increased strength and reduced formability, and achieves the effect of good resistance to secondary processing brittleness

Inactive Publication Date: 2016-05-25
SHOUGANG CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the current interstitial-free steel, provide an ultra-deep drawing interstitial-free steel and its production method, and solve the technical problem that the strength of the existing interstitial-free steel is improved while the formability is reduced. Increased tensile strength of finished product

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  • Extra-deep drawing interstitial free steel and production method thereof
  • Extra-deep drawing interstitial free steel and production method thereof
  • Extra-deep drawing interstitial free steel and production method thereof

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Embodiment 1

[0054] An ultra-deep drawing interstitial-free steel provided in an embodiment of the present invention has a chemical composition and a mass percent content of: C: 0.0020%, Si: 0.0021%, Mn: 0.20%, P: 0.015%, S: 0.006%, Ti: 0.06%, B: 0.0004%, N: ≤ 0.0022%, and the balance is iron and unavoidable impurities.

[0055] The method for producing above-mentioned ultra-deep drawing interstitial-free steel, its steps are as follows:

[0056] 1) The steelmaking process of molten iron three-stripping, LF refining, and RH refining is adopted, and the product is smelted and continuously cast into billets according to the predetermined composition. The chemical composition and mass percentage content are: C: 0.0020%, Si: 0.0021%, Mn: 0.20%, P: 0.015%, S: 0.006%, Ti: 0.058%, B: 0.0004%, N: ≤ 0.0022%, and the balance is iron and unavoidable impurities.

[0057] 2) After heating the slab, rough rolling and finishing rolling are carried out to obtain a hot-rolled plate. The heating temperatur...

Embodiment 2

[0061] An ultra-deep drawing interstitial-free steel provided in an embodiment of the present invention has a chemical composition and a mass percentage content of: C: 0.0025%, Si: 0.0008%, Mn: 0.12%, P: 0.017%, S: 0.001%, Ti: 0.055%, B: 0.0003%, N: 0.0012%, and the balance is iron and unavoidable impurities.

[0062] A method for producing an ultra-deep drawn interstitial-free steel with a tensile strength above 300 MPa, the steps of which are:

[0063] 1) The steelmaking process of molten iron three-stripping, LF refining, and RH refining is adopted, and the product is smelted and continuously cast into billets according to the predetermined composition. The chemical composition and mass percentage content are: C: 0.0025%, Si: 0.0008%, Mn: 0.12%, P: 0.017%, S: 0.001%, Ti: 0.05%, B: 0.0003%, N: 0.0012%, and the balance is iron and unavoidable impurities.

[0064] 2) After heating the slab, rough rolling and finish rolling are carried out to obtain a hot-rolled slab, and the ...

Embodiment 3

[0068] An ultra-deep drawing interstitial-free steel provided in an embodiment of the present invention has a chemical composition and a mass percent content of: C: 0.0018%, Si: 0.0017%, Mn: 0.16%, P: 0.016%, S: 0.006%, Ti: 0.05%, B: 0.0004%, N: 0.0028%, and the balance is iron and unavoidable impurities.

[0069] The method for producing above-mentioned ultra-deep drawing interstitial-free steel, its steps are as follows:

[0070] 1) The steelmaking process of molten iron three-stripping, LF refining, and RH refining is adopted, and the product is smelted and continuously cast into billets according to the predetermined composition. The mass percentage content is: C: 0.0018%, Si: 0.0017%, Mn: 0.16%, P: 0.016%, S: 0.006%, Ti: 0.07%, B: 0.0004%, N: 0.0028%, and the balance is iron and unavoidable impurities.

[0071] 2) After heating the slab, rough rolling and finish rolling are carried out to obtain a hot-rolled plate. The heating temperature is 1220°C, the rough rolling exi...

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Abstract

The invention discloses extra-deep drawing interstitial free steel. The extra-deep drawing interstitial free steel comprises the following chemical components in percentage by weight: 0.0010%-0.0030% of C, less than or equal to 0.04% of Si, 0.10%-0.20% of Mn, 0.01%-0.03% of P, less than or equal to 0.02% of S, 0.04%-0.06% of Ti, 0.0002%-0.0008% of B, less than or equal to 0.006% of N and the balance of iron and unavoidable impurities. The invention further discloses a production method of the extra-deep drawing interstitial free steel. According to the extra-deep drawing interstitial free steel and the production method, a finished product has relatively high tensile strength but still preserves relatively low yield strength, so that the extra-deep drawing IF steel with low yield ratio and high percentage elongation and r value can meet requirements of complex deformation and rigidity of a vehicle body.

Description

technical field [0001] The invention relates to the technical field of smelting hot-rolled pickled strip steel for automobiles, in particular to an ultra-deep drawing interstitial-free steel and a production method thereof. Background technique [0002] Interstitial-free steel, referred to as IF steel (InterstitialFreeSteel), is to add trace alloy elements (mainly Ti, Nb) to ultra-low carbon (carbon content below 0.005%), so that the interstitial atoms such as C and N in the steel are completely eliminated. Fixed into carbonitrides to obtain a pure ferrite matrix structure and excellent formability. At present, the production of IF steel has become a symbol of a country's automobile steel plate. It is the current trend of IF steel research and production development to reduce production costs and develop high-quality and low-cost varieties. At present, IF Steel not only produces cold-rolled and hot-rolled steel sheets, but also includes galvanized steel sheets, high-streng...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/14C22C38/32C22C33/04
CPCC22C38/02C22C33/04C22C38/04C22C38/14C22C38/32
Inventor 邱木生黄学启崔阳赵虎贾岳李亚东吕利鸽庞二帅
Owner SHOUGANG CORPORATION
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