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Production method for high-yield-strength-grade TRIP690+Z steel

A production method and high-yield technology, applied in the direction of coating, metal material coating process, hot-dip plating process, etc., can solve the problem of no high-yield strength production method, processing method or manufacturing method, etc., and achieve good corrosion resistance. , the effect of good surface quality

Inactive Publication Date: 2019-12-24
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] So far, there is no clarification on the production method, processing method or manufacturing method of high yield strength (490-530MPa) grade TRIP690+Z steel

Method used

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  • Production method for high-yield-strength-grade TRIP690+Z steel
  • Production method for high-yield-strength-grade TRIP690+Z steel
  • Production method for high-yield-strength-grade TRIP690+Z steel

Examples

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Embodiment Construction

[0018] 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.

[0019] The chemical composition of steel slabs in Examples 1-3 of the present invention includes C: 0.16-0.18%, Si≤0.10%, Mn: 1.65-1.85%, Alt: 0.50-0.70%, Nb: 0.025-0.055%, Mo : 0.10~0.15%, B: 0.0012~0.0020%, and limit P≤0.010%, S≤0.005%, N≤0.005%, O≤0.005%, and the balance is Fe and other unavoidable impurities. The chemical composition of the tapping molten steel of the steel slabs in specific embodiments 1-3 is shown in Table 1.

[0020] The actual smelting composition (mass percentage, %) of table 1 embodiment 1-3

[0021]

[0022] A kind of high yield strength level TRIP690+Z steel prod...

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Abstract

The invention relates to a production method for high-yield-strength-grade TRIP690+Z steel. The method comprises the steps of heating a slab, performing hot rolling, performing acid rolling, performing hot galvanizing and performing finishing, withdrawal and straightening. Due to the reasonable composition design, key technological parameters of step segments are effectively controlled, the multi-phase structure balance ratio is realized, the steel is prepared from 40-60% of a ferritic structure, 30-50% of a bainite structure and not smaller than 8% of retained austenite structure, the TRIP690+Z steel product with the good surface quality and the yield strength grade being 490-530 MPa is produced, the thickness specification range of the steel product is 0.8-2.0 mm, the tensile strength islarger than 690 MPa, the yield ratio is larger than 0.68, the elongation ratio A 80 is larger than 20%, n is not smaller than 0.19, and the hole expansion rate lambda is not smaller than 85%, and themethod is particularly applicable to manufacturing reinforcers and anti-collision parts for complex automobiles with the special requirements for the good corrosion resistance, the good surface quality, flanging, chambering and the like.

Description

technical field [0001] The invention belongs to the technical field of hot-dip galvanized high-strength steel for automobiles, and in particular relates to a production method of TRIP690+Z steel with high yield strength grade. Background technique [0002] For 690MPa high-strength steel, the manufacturing concept of Hyundai Motor proposes different requirements for multi-performance, multi-parts, and multi-specifications such as corrosion resistance, excellent ductility, easy processing and formability, high strength and geometric accuracy. Among them, TRIP690+Z steel products with high yield strength (490-530MPa) are especially suitable for complex automotive reinforcements and anti-collision parts that require good corrosion resistance and surface quality, and have special requirements such as flanging and hole expansion. Manufacture of components. [0003] Publication No. CN 102154604 provides a process for preparing hot-dip galvanized steel sheets induced by phase chang...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C23C2/06C23C2/40C21D8/02
CPCC21D8/0205C21D8/0221C21D8/0247C21D2211/001C21D2211/002C21D2211/005C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12C23C2/06C23C2/40
Inventor 侯晓英朱信成王业勤何召东丁紫正康华伟尹翠兰郝亮金光宇梁亚王鹏
Owner SD STEEL RIZHAO CO LTD
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