Production method of hot-galvanized low-alloy high strength steel having no yield point elongation and used for automobile sheets

A production method and no-yield technology, applied in the field of metallurgy, can solve the problems of low strength level, high alloy content, low yield strength, etc., achieve strong rolling capacity, large smooth rolling force control, and eliminate yield platform Effect

Active Publication Date: 2019-12-06
SD STEEL RIZHAO CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN104988389A discloses alloyed hot-dip galvanized steel with a tensile strength of 340MPa, and the yield strength is only 250-280MPa, and the strength level is not high
CN105239002A i...

Method used

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  • Production method of hot-galvanized low-alloy high strength steel having no yield point elongation and used for automobile sheets
  • Production method of hot-galvanized low-alloy high strength steel having no yield point elongation and used for automobile sheets
  • Production method of hot-galvanized low-alloy high strength steel having no yield point elongation and used for automobile sheets

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Embodiment Construction

[0023] The following are specific examples of the present invention, further describing the technical solutions of the present invention, but the protection scope of the present invention is not limited to these examples. All changes or equivalent substitutions that do not depart from the concept of the present invention are included in the protection scope of the present invention.

[0024] Hot-dip galvanized low-alloy high-strength steel with no yield platform for automobile plates, the chemical composition and mass percentage of the steel are: C: 0.060-0.090%, Si≤0.05%, Mn: 0.65-0.75%, P: 0.015- 0.025%, S≤0.010%, Als: 0.025~0.06%, Nb: 0.025~0.035%, N≤0.0040%, the rest is Fe and unavoidable impurities.

[0025] The production method of hot-dip galvanized low-alloy high-strength steel with no yield platform for automobile plates includes smelting, continuous casting, hot rolling, acid continuous rolling, and hot-dip galvanizing processes. In the hot rolling process, the exit...

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Abstract

The invention relates to a production method of hot-galvanized low-alloy high strength steel having no yield point elongation and used for automobile sheets. The production method comprises smelting,continuous casting, hot rolling, acid continuous rolling and hot galvanizing procedures. The steel comprises chemical components in percentage by mass as follows: 0.060%-0.090% of C, smaller than or equal to 0.05% of Si, 0.65%-0.75% of Mn, 0.015%-0.025% of P, smaller than or equal to 0.010% of S, 0.025%-0.06% of Als, 0.025%-0.035% of Nb, smaller than or equal to 0.0040% of N and the balance Fe andinevitable impurities. By reasonable component design and control on key process parameters such as hot rolling coiling temperature and finishing elongation, dislocation gets rid of the effect of solute atom (Cottrell) anchoring, the yield point elongation can be completely eliminated, slip line defects in the re-machining forming process are avoided, the final surface quality of the product is improved, and the steel has excellent mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method of hot-dip galvanized low-alloy high-strength steel HX340LAD+Z with no yield platform for automobile plates. Background technique [0002] With the rapid development of automobile lightweight and the improvement of environmental protection requirements, hot-dip galvanized low-alloy high-strength steel can reduce the thickness of the steel strip to achieve lightweight due to its high strength, and improve the corrosion resistance of the zinc layer after galvanizing Therefore, the application of hot-dip galvanized low-alloy high-strength steel is more and more extensive. [0003] At present, when most of the hot-dip galvanized low-alloy high-strength steels are subjected to tensile tests after annealing and galvanizing, there are different degrees of yield platforms on the stress-strain curves. When such yield platforms are reprocessed, slippage o...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C38/06C22C38/04C22C38/02C21D8/02C21D1/26
CPCC21D1/26C21D8/0205C21D8/0247C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 康华伟高兴昌张磊尹翠兰王鹏侯晓英
Owner SD STEEL RIZHAO CO LTD
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