Alloying hot galvanizing steel with tensile strength larger than or equal to 590 MPa and production method

A technology of tensile strength and alloying, applied in hot-dip plating process, metal material coating process, coating, etc., can solve the problems of lowering and lowering of mechanical properties of steel base, so as to reduce decomposition, improve production efficiency, and organize small effect

Inactive Publication Date: 2017-10-13
武汉钢铁有限公司
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Problems solved by technology

[0008] The purpose of the present invention is to overcome the deficiencies in the prior art of severe powdering of the high-strength steel coating and the decline in the mechanical properties of the steel base after alloying, and provide a method that ensures tensile strength ≥ 590Mpa, yield s

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  • Alloying hot galvanizing steel with tensile strength larger than or equal to 590 MPa and production method
  • Alloying hot galvanizing steel with tensile strength larger than or equal to 590 MPa and production method
  • Alloying hot galvanizing steel with tensile strength larger than or equal to 590 MPa and production method

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Embodiment Construction

[0036] The present invention is described in detail below:

[0037] Table 1 is the component value list of each embodiment of the present invention and comparative example;

[0038] Table 2 is the main process parameter list of each embodiment of the present invention and comparative example;

[0039] Table 3 is a list of the mechanical performance testing of each embodiment of the present invention and comparative examples.

[0040] Each embodiment of the present invention is produced according to the following steps:

[0041] 1) After conventional hot rolling, cooling, crimping, pickling and cold rolling;

[0042] 2) Carry out continuous annealing, and control the annealing temperature at 790-810°C, and the running speed of the steel strip at 110-120m / min;

[0043] 3) Carry out continuous hot-dip galvanizing. When the temperature of the steel plate drops to 480±5°C, put it into a zinc liquid pot with a temperature of 460±5°C for hot-dip galvanizing; control the Al content...

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Abstract

An alloyed hot-dip galvanized steel with a tensile strength ≥ 590MPa, the steel base composition and wt% are C: 0.080-0.095, Mn: 1.65-1.85%, Si: 0.010-0.015%, P≤0.01%, S ≤0.006%, Al: 0.02-0.03%, Ti: 0.06-0.08%. Production steps: hot rolling, cooling, crimping, pickling and cold rolling; continuous annealing; continuous hot-dip galvanizing; alloying; cooling with an air knife; post-processing. In the present invention, under the conditions of ensuring tensile strength ≥ 590Mpa, yield strength ≥ 340MPa, elongation ≥ 20%, and n ≥ 0.14, the structure of the alloyed coating is fine, uniform, and dense, and the pulverization level does not exceed 2. By adding the element Ti , not only can minimize the decomposition of martensite during the alloying process, but also reduce the alloying time from the current not less than 10s to 5-9s, thereby improving production efficiency.

Description

technical field [0001] The invention relates to a steel for automobiles and a production method, in particular to an alloyed hot-dip galvanized steel with a tensile strength ≥ 590 MPa and a production method. Background technique [0002] With the development of automobile lightweight technology, it has become an inevitable trend for automobile steel to develop towards high-strength steel. As one of the members, dual-phase steel has the advantages of combining low yield strength, high tensile strength and good plasticity, so it has become the first choice for automotive steel. Compared with ordinary cold-rolled steel, galvanized dual-phase steel also has excellent corrosion resistance, which ensures that the car has good corrosion resistance and perforation ability. It is currently mainly used for structural parts and reinforcements of cars. Duplex steels can also be used in automotive panels. The alloying process is to heat the steel plate in a holding furnace after galva...

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Application Information

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IPC IPC(8): C22C38/14C22C38/04C22C38/02C22C38/06C21D1/26C21D8/02C23C2/06C23C2/40C23C2/28
CPCC22C38/14C21D1/26C21D8/0221C22C38/02C22C38/04C22C38/06C23C2/06C23C2/28C23C2/40
Inventor 杨震陈宇黄峰潘立波李箭
Owner 武汉钢铁有限公司
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