Method for manufacturing hot-dip galvanized steel sheet

A technology of hot-dip galvanized steel sheet and manufacturing method, which is applied in hot-dip galvanizing process, manufacturing tools, chemical instruments and methods, etc., can solve the problems of reduced productivity, decreased coating adhesion, decreased coating alloying speed, etc.

Pending Publication Date: 2021-08-17
JFE STEEL CORP
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, Si causes non-plating, and in the case of heating and alloying galvanizing, the rate of plating alloying decreases and productivity decreases.
Alloying at a high temperature to improve productivity makes it difficult to control the Fe concentration in the Fe-Zn alloy phase and reduces plating adhesion

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for manufacturing hot-dip galvanized steel sheet
  • Method for manufacturing hot-dip galvanized steel sheet
  • Method for manufacturing hot-dip galvanized steel sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0104] A steel having a composition containing elements shown in Table 1 and the remainder consisting of Fe and unavoidable impurities was melted in a converter and cast into a slab by a continuous casting method. The obtained slab was heated at 1240° C. for 60 minutes in a heating furnace, hot-rolled, and coiled at 550° C. to obtain a hot-rolled steel sheet. Next, pickling was performed on the hot-rolled steel sheet to remove black scale, and cold rolling was performed to obtain a cold-rolled steel sheet with a thickness of 1.4 mm. The cold-rolled steel sheet was subjected to the first annealing step, the Fe film formation step, and the second annealing step under the conditions shown in Table 2 and Table 3. It should be noted that in Table 2 and Table 3, the holding time of the first annealing step represents the time for holding the steel sheet in the temperature range of 650°C to 900°C, and the holding time of the second annealing step represents the holding time of the st...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

Provided is a method for manufacturing a hot-dip galvanized steel sheet having excellent surface appearance, plating adhesion properties and corrosion resistance. The method for manufacturing a hot-dip galvanized steel sheet according to the present disclosure is characterized by comprising: a first annealing step of retaining a steel sheet having a component composition containing, in % by mass, 0.10 to 3.0% inclusive of Si and 1.0 to 10.0% inclusive of Mn in a temperature range from 650 to 900 deg C inclusive for 30 seconds or longer in a reducing atmosphere containing hydrogen and having a dew point of -65 to -20 deg C inclusive, and then cooling the resultant steel sheet; a step of forming a Fe coating film at an adhesion amount of 0.3 g / m2 to 10.0 g / m2 inclusive on the surface of the steel sheet; a second annealing step of retaining the steel sheet in a temperature range from 700 to 900 deg C inclusive for 30 seconds or longer in a reducing atmosphere containing hydrogen and having a dew point of 0 deg C or lower wherein the highest reachable temperature of the steel sheet is 900 deg C or lower, and then cooling the resultant steel sheet; and a step of subjecting the steel sheet to a hot-dip galvanization procedure.

Description

technical field [0001] The present invention relates to a method for manufacturing a hot-dip galvanized steel sheet suitable for parts used in industrial fields such as automobiles. Background technique [0002] In recent years, improving the fuel efficiency of automobiles has become an important issue from the viewpoint of protecting the global environment. Therefore, there is an active movement towards reducing the weight of automobile bodies by increasing the strength and reducing the thickness (weight reduction) of steel sheets which are materials of automobile parts. However, increasing the strength of steel sheets leads to a reduction in formability, and therefore development of steel sheets having both high strength and high formability has been desired. In addition, high-strength galvanized steel sheets are sought from the viewpoint of antirust performance of vehicle bodies. [0003] In order to improve the formability of the steel sheet, it is effective to add sol...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C23C2/02C21D9/46C22C38/00C22C38/04C22C38/60C23C2/06C23C2/40
CPCC23C2/02C22C38/04C23C2/06C23C2/40C22C38/60C21D1/76C21D1/26C21D8/0478C21D8/0447C21D9/48C21D8/0473C21D6/005C22C38/02C22C38/38C22C38/06C22C38/002C22C38/12C22C38/14C22C38/16C22C38/08C22C38/008C22C38/005C23C2/28B32B15/013C23C28/025C23C2/0222C23C2/024C23C2/0224C23C2/026
Inventor 青山麻衣铃木善继
Owner JFE STEEL CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap