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Method for producing alloyed hot-dip galvanized steel sheet having excellent adhesion to plating and excellent sliding properties

A technology of hot-dip galvanized steel sheet and sliding characteristics, applied in chemical instruments and methods, manufacturing tools, coatings, etc., can solve the problems of inability to stably improve the effect of coating adhesion, and achieve excellent sliding characteristics and coating adhesion. Excellent effect

Active Publication Date: 2014-12-24
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in Patent Document 1, there is a problem that the effect of improving the adhesion of the plating layer cannot be stably obtained.

Method used

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  • Method for producing alloyed hot-dip galvanized steel sheet having excellent adhesion to plating and excellent sliding properties
  • Method for producing alloyed hot-dip galvanized steel sheet having excellent adhesion to plating and excellent sliding properties
  • Method for producing alloyed hot-dip galvanized steel sheet having excellent adhesion to plating and excellent sliding properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Steel containing 1.5% by mass of Si was hot-rolled, pickled, and cold-rolled by a known method to manufacture a steel plate with a thickness of 1.5 mm. Other components are C: 0.12% by mass, Mn: 1.9% by mass, Al: 0.04% by mass, S: 0.002% by mass, and P: 0.01% by mass. The obtained steel sheets were oxidized under the conditions shown in Table 1 using a direct-fired heating furnace. Direct fire burners use COG as fuel to adjust the O of the atmosphere by making various changes to the air ratio 2 concentration. The temperature of the steel plate on the furnace exit side was measured using a thermocouple attached to the sample in advance. In addition, the amount of oxidation formed at this time was measured using standard substances and fluorescent X-ray analysis. In addition, Si-containing oxides formed together with iron oxides were analyzed by infrared spectroscopy. According to as (Fe, Mn) 2 SiO 4 Characteristic 980cm -1 Whether there are peaks nearby to judge (...

Embodiment 2

[0070] The same steel as in Example 1 was hot-rolled, pickled, and cold-rolled by a known method to produce a steel plate with a thickness of 1.5 mm. The obtained steel sheet is passed through a continuous hot-dip galvanizing production line equipped with a preheating furnace, a heating furnace with a direct-fired burner, a radiant tube type annealing furnace, a cooling furnace, a hot-dip galvanizing device, and an alloying furnace, and is subjected to oxidation treatment and reduction Annealed to obtain a hot-dip galvanized steel sheet.

[0071] The oxidation treatment was performed under the conditions shown in Table 2 using a heating furnace equipped with a direct-fired burner. The furnace with direct fire burners is divided into 4 zones, each of which has the same length. The direct fire burner uses COG as fuel, and adjusts the O of the atmosphere by changing the air ratio of the front section (1-3 zones) and the rear section (4 zones) of the heating furnace. 2 concentra...

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Abstract

A method for producing an alloyed hot-dip galvanized steel sheet having excellent adhesion to a plating and excellent sliding properties, which comprises subjecting a steel sheet to an oxidation treatment and then subjecting the resultant product to reduction annealing, said method being characterized in that the oxidation treatment comprises heating the steel sheet in an atmosphere containing 1000 ppm or more of O2 and a remainder made up by N2, CO, CO2, H2O and unavoidable impurities until the temperature of the steel sheet reaches 600 DEG C or higher and then further heating the steel sheet in an atmosphere containing less than 1000 ppm of O2 and a remainder made up by N2, CO, CO2, H2O and unavoidable impurities until the temperature of the steel sheet reaches 700 DEG C or higher and the reduction annealing is carried out in an atmosphere having a dew point of 5 DEG C or higher and containing 1 to 15 vol% of H2 and a remainder made up by N2 and unavoidable impurities.

Description

technical field [0001] The invention relates to a method for manufacturing an alloyed hot-dip galvanized steel sheet using a Si-containing high-strength steel sheet as a base material. Background technique [0002] In recent years, surface-treated steel sheets that impart rust resistance to base steel sheets, especially hot-dip galvanized steel sheets and alloyed hot-dip galvanized steel sheets that are excellent in rust resistance, have been used in the fields of automobiles, home appliances, and building materials. In addition, from the viewpoint of improving the fuel economy of automobiles and the safety of collisions of automobiles, high-strength steel sheets are used in automobiles in order to achieve thinning through high-strength body materials, thereby reducing the weight and high-strength of the body itself. use is promoted. [0003] In general, alloyed galvanized steel sheets are manufactured by using thin steel sheets obtained by hot-rolling and cold-rolling bill...

Claims

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Application Information

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IPC IPC(8): C23C2/02C21D9/46C22C38/00C22C38/06C23C2/06C23C2/28
CPCC23C2/02C21D9/46C22C38/00C22C38/06C21D1/76C23C8/80B32B15/013C22C38/02C22C38/04C23C2/12C23C8/14C21D9/561C23C2/0222C23C2/024C23C2/0224C23C2/06C23C2/40C23C2/022
Inventor 牧水洋一铃木善继宫田麻衣
Owner JFE STEEL CORP
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