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Alloyed hot dip galvanizing double-phase steel and preparation method thereof

A technology of alloying and hot-dip galvanizing, applied in hot-dip galvanizing process, metal material coating process, coating, etc., can solve the problems of inability to obtain martensitic phase, hinder the cooling process of strip steel, and reduce the cooling rate, etc. Achieve the effect of improving bendability, improving hardenability and improving tensile strength

Inactive Publication Date: 2020-04-10
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, unlike the continuous annealing process, in the alloying galvanizing process, the galvanizing temperature and alloying temperature hinder the cooling process of the strip and reduce the cooling rate, so that a sufficient amount of martensitic phase cannot be obtained.

Method used

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  • Alloyed hot dip galvanizing double-phase steel and preparation method thereof
  • Alloyed hot dip galvanizing double-phase steel and preparation method thereof
  • Alloyed hot dip galvanizing double-phase steel and preparation method thereof

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Embodiment Construction

[0023] The embodiment of the present application solves the defects of the existing hot-dip galvanized dual-phase steel in terms of mechanical properties and preparation methods by providing an alloyed hot-dip galvanized dual-phase steel and a preparation method thereof.

[0024] The technical solution of the embodiment of the present application is to solve the above-mentioned technical problems, and the general idea is as follows:

[0025] The alloyed hot-dip galvanized dual-phase steel in the embodiment of the present invention includes the following chemical components in weight percent:

[0026] Carbon C: 0.10% to 0.15%, silicon Si: 0.2% to 0.5%, manganese Mn: 2.5% to 2.9%, all aluminum Alt: 0.02% to 0.05%, titanium Ti: 0.015% to 0.03%, niobium Nb: 0.015 %~0.03%, chromium Cr: 0.4%~0.6%, molybdenum Mo: 0.1%~0.3%, phosphorus P≤0.01%, sulfur S≤0.01%, nitrogen N≤0.004%, the balance is Fe and unavoidable impurities element.

[0027] figure 2 The microstructure photo of the...

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Abstract

The embodiment of the invention discloses alloyed hot dip galvanizing double-phase steel. The steel comprises chemical components including, by weight percentage, 0.10%-0.15% of C, 0.2%-0.5% of Si, 2.5%-2.9% of Mn, 0.02%-0.05% of Alt, 0.015%-0.03% of Ti, 0.015%-0.03% of Nb, 0.4%-0.6% of Cr, 0.1%-0.3% of Mo, smaller than or equal to 0.01% of P, smaller than or equal to 0.01% of S, smaller than or equal to 0.004% of N, and the balance Fe and inevitable impurity elements. According to the double-phase steel, an alloy component system is designed reasonably, then a reasonable technology method matched with the system is determined, and the 1180MPa-level alloyed hot dip galvanizing double-phase steel is obtained. Ductility and bendability of the alloyed hot dip galvanizing double-phase steel are improved, and thus the steel can meet the special requirement of car parts for machinability.

Description

technical field [0001] The invention relates to the technical field of cold-rolled hot-dip galvanized steel, in particular to an alloyed hot-dip galvanized dual-phase steel and a preparation method thereof. Background technique [0002] With the development of automobiles in the direction of energy saving, environmental protection, safety and comfort, while the body is developing in the direction of lightweight, the requirements for corrosion resistance and impact resistance are also getting higher and higher. Coupled with the competitive pressure from materials such as aluminum, magnesium, and plastics, steel sheets for automobiles are forced to develop in the direction of high-strength coatings. [0003] The microstructure of dual-phase steel (DP, Dual Phase Steel) is composed of polygonal ferrite and martensite. Ferrite provides the ductility of steel, and martensite provides strength and hardness. The dual-phase steel has the characteristics of low yield ratio, high ini...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/28C22C38/26C22C38/22C22C38/06C22C38/02C22C33/04C21D8/02C21D1/26C23C2/06C23C2/40
CPCC21D1/26C21D8/0205C21D8/0226C21D8/0236C21D8/0247C21D2211/005C21D2211/008C22C33/04C22C38/001C22C38/002C22C38/02C22C38/06C22C38/22C22C38/26C22C38/28C22C38/38C23C2/06C23C2/40
Inventor 姜英花韩赟刘华赛邱木生滕华湘李飞
Owner SHOUGANG CORPORATION
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