Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

High-strength cold-rolled steel sheet having excellent formability and coating properties, zinc-based metal-plated steel sheet made therefrom, and manufacturing method

A cold-rolled steel sheet, formability technology, applied in metal material coating process, coating, hot-dip plating process, etc., can solve the problems of high production cost and difficulty, and achieve improved coating characteristics, excellent formability, enhanced Effect of bake hardening characteristics

Active Publication Date: 2018-01-30
浦项股份有限公司
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to obtain good workability, there are one or more heat treatment procedures before coating, resulting in high production cost of this patented process and many difficulties in practical application

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
  • High-strength cold-rolled steel sheet having excellent formability and coating properties, zinc-based metal-plated steel sheet made therefrom, and manufacturing method
  • High-strength cold-rolled steel sheet having excellent formability and coating properties, zinc-based metal-plated steel sheet made therefrom, and manufacturing method
  • High-strength cold-rolled steel sheet having excellent formability and coating properties, zinc-based metal-plated steel sheet made therefrom, and manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0038] In addition, when formability needs to be further improved in addition to the above-mentioned coating characteristics, according to one embodiment of the present invention, it is preferable to control the content of nitrogen (N) to satisfy one or both of the following inequalities:

[0039] (Si / 28+Al / 27) / (N / 14)≥10(l)

[0040] N*=(N / 14) / (Al / 27+Ti / 48+Nb / 93+V / 51+B / 11)≥0.2(2)

[0041] Furthermore, in one embodiment of the present invention, the bake hardening characteristics are also improved due to the fixation of dissolved nitrogen after the steel sheet is coated.

[0042] The composition of the steel material according to the present invention will be described below.

[0043] Steel Composition

[0044] Carbon (C): 0.01-0.2%

[0045] Carbon (C) is a very important component for increasing the strength of the steel sheet and securing a composite structure composed of ferrite and martensite. When the carbon content is less than 0.01%, it is impossible to obtain the str...

Embodiment 1

[0107] Thick steel plates having the steel composition shown in Table 1 below were subjected to vacuum melting, heated in a heating furnace at a reheating temperature of 1150° C. to 1250° C. for 1 hour, and then hot rolled and bent. Finish hot rolling at 850°C-950°C. The bending temperature was set at 650°C. Then, the hot-rolled steel sheet is pickled and cold-rolled at a cold-rolling reduction ratio of 50-70%. Under the conditions shown in Table 2, the cold-rolled steel sheets were subjected to continuous annealing, primary cooling and secondary cooling. For the tensile strength test, the JIS5 test strip is taken from the continuously annealed cold-rolled steel plate to check the quality of its material.

[0108] In addition, in order to observe the coating characteristics, the continuously annealed steel sheet manufactured as described above was heated to 460°C, hot-dip galvanized for 5 seconds, alloyed at 500°C for 10 seconds, then cooled to room temperature, and then obs...

Embodiment 2

[0122] Thick steel plates having the steel composition shown in Table 4 below were subjected to vacuum melting, heated in a heating furnace at a reheating temperature of 1150° C. to 1250° C. for 1 hour, and then hot rolled and bent. Hot rolling is terminated at 850°C-950°C. The bending temperature was set at 650°C. Then, the hot-rolled steel sheet is pickled and cold-rolled at a cold-rolling reduction ratio of 50-70%. The cold-rolled steel sheets were subjected to continuous annealing, primary cooling and secondary cooling under the conditions shown in Table 5.

[0123]For the tensile strength test, the JIS5 test strips were taken from the annealed cold-rolled steel sheets and inspected for their material quality. In addition, in order to simulate the quality of the material after being coated on an automobile part, a 2% strain (strain) was added to the JIS5 test strip prepared as described above, and then the test strip was boiled in oil at 170° C. for 20 minutes, and then ...

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

PropertyMeasurementUnit
tensile strengthaaaaaaaaaa
Login to View More

Abstract

Provided is a high-strength cold rolled steel sheet and a high-strength zinc-coated steel sheet, which are primarily used as a structural member and a reinforcement of the car body, and has excellent formability and coating properties; and methods for manufacturing the same. The steel sheet comprises 0.01-0.2 wt% of carbon (C), 0.01-2.0 wt% of silicon (Si), 0.5-4.0 wt% of manganese (Mn), less than 0.1 wt% of phosphorous (P), less than 0.03 wt% of sulfur (S), less than 1.0 wt% of soluble aluminum (Sol. Al), 0.001-0.1 wt% of nitrogen (N), 0.005-1.0 wt% of antimony (Sb), and the balance of iron (Fe) with inevitable impurities. Provided is also a zinc- coated steel sheet and preparation thereof using the same steel sheet. According to the present invention, excellent coating properties and high tensile strength of more than 490 MPa can be achieved. In addition, the formability of TS * El balance having 15,000 MPaD % or higher can be secured. Further, excellent bake hardenability of a BH value having 80 MPa or higher can be obtained.

Description

[0001] This application is No. 200680046344.X filed on December 8, 2006, entitled "High-strength cold-rolled steel sheet with excellent formability and coating properties, zinc-based metal-plated steel sheet made of it and manufacturing method" A divisional application of an invention patent application. technical field [0002] The present invention relates to a steel sheet mainly used as a structural component and reinforcement of a vehicle body, a zinc-based metal-plated steel sheet (zinc-coated steel sheet) made therefrom, and a manufacturing method thereof. More specifically, the present invention relates to a high-strength cold-rolled steel sheet having a tensile strength greater than 490 MPa and excellent coating properties, a zinc-based metal-plated steel sheet (zinc-coated steel sheet) made therefrom, and a method of manufacturing the same. Background technique [0003] Recently, along with the strengthening and expansion of motor vehicle occupant safety regulations...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/60C21D8/02C23C2/06
CPCC21D8/0226C21D2211/005C21D2211/008C22C38/001C22C38/02C22C38/06C22C38/38C22C38/44C22C38/48C22C38/60
Inventor 安衍相吴振根孙一领金成柱陈光根
Owner 浦项股份有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com