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

Cold-rolled steel sheet and manufacturing method for same

A technology of cold-rolled steel sheet and manufacturing method, applied in the direction of manufacturing tools, metal rolling, furnace type, etc., can solve problems such as adverse effects on the formability of steel sheets

Active Publication Date: 2014-12-31
NIPPON STEEL CORP
View PDF7 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the massive austenite in this steel sheet has a grain size of about 2.2 μm to 20 μm and is coarse, it is considered to adversely affect the formability of the steel sheet.

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
  • Cold-rolled steel sheet and manufacturing method for same
  • Cold-rolled steel sheet and manufacturing method for same
  • Cold-rolled steel sheet and manufacturing method for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0163] Steel ingots of steel types A to M having the chemical compositions shown in Table 1 were melted in a vacuum induction furnace. Table 1 also shows Ac of steel grades A to M 1 point and Ac 3 point. These transformation temperatures were obtained from thermal expansion curves measured when a steel sheet subjected to cold rolling under the manufacturing conditions described later was raised to 1100° C. at a heating rate of 2° C. / sec. Also further shown in table 1 (Ac 1 point+10℃), (0.3×Ac 1 Point+0.7×Ac 3 point) and (Ac 3 point +100°C).

[0164] [Table 1]

[0165]

[0166] These steels are hot-forged and then hot-rolled, so they are cut into slab-shaped billets. Each of the obtained slabs was heated at a temperature of 1000° C. or higher for about 1 hour, and then hot-rolled at the hot-rolling end temperature shown in Table 2 using a small rolling mill for a test. After completion of rolling, hot-rolled steel sheets with a thickness of 2.0 to 2.6 mm were produc...

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
particle sizeaaaaaaaaaa
particle diameteraaaaaaaaaa
crystal sizeaaaaaaaaaa
Login to View More

Abstract

A high-strength cold-rolled steel sheet exhibiting excellent ductility and stretch-flangeability has the following chemical composition, in mass%, 0.06-0.3% of C, 0.6-2.5% of Si, 0.6-3.5% of Mn, 0-0.08% of Ti, 0-0.04% of Nb, 0-0.10% of Ti+Nb, 0-2.0% of sol. Al, 0-1% of Cr, 0-0.3% of Mo, 0-0.3% of V, 0-0.005% of B, 0-0.003% of Ca, 0-0.003% of REM, with the remainder consisting of Fe and impurities. The cold-rolled steel sheet has a microstructure in which the main phase comprises at least a total of 40% by area of martensite and / or bainite. The cold-rolled steel sheet has an aggreate structure in which the ratio of the mean X ray intensity from the {100}<011> to the {211}<011> orientation group to the mean X ray intensity of random structures not having an aggregate structure is less than 6.

Description

technical field [0001] The present invention relates to a cold-rolled steel sheet and a manufacturing method thereof. More specifically, the present invention relates to a cold-rolled steel sheet having high strength and excellent workability, and a method for producing the same having excellent stability. Background technique [0002] Regarding the technology for improving the mechanical properties of cold-rolled steel sheets, the following Patent Document 1 discloses lath-shaped austenite containing 3% or more of bainitic ferrite as the main phase, and Contains massive austenite at a ratio of 1% to (area occupancy ratio of lath-shaped retained austenite (area occupancy ratio) × 1 / 2), making it a high-strength steel sheet with excellent elongation and tensile flangeability . However, since the massive austenite in this steel sheet has a grain size of about 2.2 μm to 20 μm and is coarse, it is considered to adversely affect the formability of the steel sheet. [0003] Pat...

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 Applications(China)
IPC IPC(8): C22C38/00B21B3/00C21D9/46C22C38/60
CPCC22C38/00C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/18C21D8/0236C21D8/0247C21D8/0284C21D2211/002C21D2211/005C21D2211/008C22C38/26C22C38/38
Inventor 畑显吾富田俊郎今井规雄芳贺纯西尾拓也
Owner NIPPON STEEL CORP
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