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Method for improving brittle transition temperature of cold-rolled IF rephosphorized high-strength steel

A technology of brittle transition temperature and high-strength steel, which is applied in the field of cold-rolled IF-added high-strength steel, can solve problems affecting the personal safety of car users, achieve the effects of increasing brittle transition temperature, reducing production costs, and increasing brittle transition temperature

Inactive Publication Date: 2017-06-30
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for improving the brittle transition temperature of cold-rolled IF-added phosphorus high-strength steel, so as to solve the problems in the prior art that steel plates are prone to brittle fracture and seriously affect the personal safety of car users.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] In this embodiment, the chemical composition of the cold-rolled IF-phosphorus-added high-strength steel is as follows: carbon 0.0020%, silicon 0.025%, manganese 0.10%, sulfur 0.0040%, aluminum 0.036%, titanium 0.061%, niobium 0.08%, Phosphorus 0.080%, boron 0.0015%, oxygen 0.0025%, nitrogen 0.0035%, the rest is iron, the brittle transition temperature of steel reaches minus 55 ℃.

Embodiment 2

[0016] In this embodiment, the chemical composition of the cold-rolled IF-phosphorus-added high-strength steel is as follows: carbon 0.0015%, silicon 0.012%, manganese 0.15%, sulfur 0.0046%, aluminum 0.043%, titanium 0.045%, niobium 0.13%, Phosphorus 0.052%, boron 0.0010%, oxygen 0.0020%, nitrogen 0.0030%, the rest is iron, the brittle transition temperature of steel reaches minus 50 ℃.

Embodiment 3

[0018] In this embodiment, the chemical composition of the cold-rolled IF-phosphorus-added high-strength steel in terms of weight percentage is as follows: carbon 0.0025%, silicon 0.018%, manganese 0.20%, sulfur 0.0032%, aluminum 0.027%, titanium 0.067%, niobium 0.16%, Phosphorus 0.085%, boron 0.0018%, oxygen 0.0015%, nitrogen 0.0020%, the rest is iron, the brittle transition temperature of steel reaches minus 60 ℃.

[0019] The results of the examples show that, for the cold-rolled IF phosphorus-added high-strength steel, the present invention improves the brittle transition temperature of the steel by adding an appropriate amount of B element in the smelting process, improves the secondary workability of the steel, and avoids the use of the steel at low temperature and secondary processing. The problem of brittle cracking occurs during processing, which improves the safety of material use.

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Abstract

The invention relates to the field of cold-rolled IF rephosphorized high-strength steel, in particular to a method for improving the brittle transition temperature of cold-rolled IF rephosphorized high-strength steel. As for the cold-rolled IF rephosphorized high-strength steel, the phosphorus content is 0.05-0.09 wt%, and the content of B is controlled to be 0.0010-0.0020 wt%. In order to improve the brittle transition temperature of the cold-rolled IF rephosphorized high-strength steel, improve the secondary machinability of the steel, adapt to the production and use requirement of automobiles in winter in China and ensure the use safety of automobiles, the element B is properly added, the brittle transition temperature of the cold-rolled IF rephosphorized high-strength steel is reduced to -50 DEG C and below, and the cold-rolled IF rephosphorized high-strength steel is protected against brittle fracture in the secondary machining process.

Description

technical field [0001] The invention relates to the field of cold-rolled IF phosphorus-added high-strength steel, in particular to a method for improving the brittle transition temperature of cold-rolled IF phosphorus-added high-strength steel. Background technique [0002] IF steel, the full name of Interstitial-Free Steel, that is, interstitial-free steel, sometimes called ultra-low carbon steel, has excellent deep drawing properties, and now the elongation and r value can reach 50% and 2.0 or more, in the automotive industry. has been widely used. In IF steel, due to the low content of C and N, a certain amount of strong carbon-nitrogen compound forming elements such as titanium (Ti) and niobium (Nb) are added to completely fix the interstitial atoms such as carbon and nitrogen in ultra-low carbon steel as Carbon and nitrogen compounds, so as to obtain clean ferritic steel without interstitial atoms, that is, ultra-low carbon interstitial free steel (Interstitial Free St...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/14C22C38/12
CPCC22C38/04C22C38/001C22C38/002C22C38/02C22C38/06C22C38/12C22C38/14
Inventor 佟铁印刘明辉李霞王亚东李春诚
Owner BENGANG STEEL PLATES
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