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

Steel sheet and method for producing same

A manufacturing method and steel plate technology, which is applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems that the relationship between rough surface appearance and structure has not been disclosed, and achieve the effects of excellent appearance, suppressed surface unevenness, and excellent formability

Active Publication Date: 2021-09-28
NIPPON STEEL CORP
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Patent Document 2 does not disclose the relationship between the appearance after molding and the structure from the viewpoint of surface roughness and texture countermeasures.
[0008] That is, in the past, there has been no proposal for a high-strength steel sheet with improved surface roughness after forming and excellent formability of pattern defects.

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
  • Steel sheet and method for producing same
  • Steel sheet and method for producing same
  • Steel sheet and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0190] Next, examples of the present invention will be described. The conditions in the examples are an example of conditions adopted for confirming the practicability and effects of the present invention, and the present invention is not limited to the examples of conditions. Various conditions can be employed in the present invention as long as the object of the present invention is achieved without departing from the gist of the present invention.

[0191] Steels having the chemical compositions shown in billets No.A to T in Table 1 were melted and continuously cast to manufacture slabs with a thickness of 240 to 300 mm. The resulting slabs were heated to the temperatures indicated in the table. The heated slabs were hot-rolled under the conditions shown in Table 2, and coiled.

[0192] Thereafter, the coil was uncoiled, and stress was applied to the hot-rolled steel sheet. At this time, using the processing temperature (steel plate temperature) shown in Table 2, a porta...

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
crystal sizeaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to View More

Abstract

A steel sheet has a chemical composition of: 0.0015-0.0400% of C; 0.20-1.50% of Mn; 0.010-0.100% of P; 0.001-0.500% of Cr; at least 0.200% of Si; at least 0.020% of S; at least 0.200% of sol. Al; at least 0.0150% of N; 0-0.500% of Mo;0-0.0100% of B; 0-0.200% of Nb; 0-0.200% of Ti; 0-0.200% of Ni; 0-0.100% of Cu; and the balance comprising iron and impurities, wherein the metal structure of the surface layer region contains at least 90% of ferrite by volume fraction, the ferrite in the surface layer region has an average crystal grain size of 1.0-15.0 [mu]m, and includes an aggregate structure in which the strength ratio XODF(001) / (111), S of orientation (001) to orientation (111), is 30-3.50 (exclusive of 3.50).

Description

technical field [0001] The present invention relates to a steel plate and a manufacturing method thereof. [0002] This application claims priority based on Japanese Patent Application No. 2019-025635 for which it applied in Japan on February 15, 2019, and uses the content here. Background technique [0003] In recent years, fuel efficiency of automobiles has been required to be improved in order to protect the global environment. With regard to the improvement of the fuel efficiency of automobiles, steel sheets for automobiles are required to be further increased in strength in order to ensure safety and reduce the weight of the vehicle body. Such a demand for higher strength is not limited to beams, pillars, etc. as structural members, but is also increasing for exterior panel parts (roof, hood, fenders, doors, etc.) of automobiles. In response to such demands, material development aimed at achieving both strength and elongation (formability) has been carried out. [00...

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): C21D9/48C22C38/00C22C38/54
CPCC22C38/00C22C38/54C21D9/48C22C38/02C21D9/46C21D8/005C22C38/16C22C38/04C22C38/44C22C38/50C22C38/48C22C38/42C21D8/0226C21D8/0236C21D8/0273C21D2211/005
Inventor 久保雅宽川田裕之大塚研一郎东昌史
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