Unlock instant, AI-driven research and patent intelligence for your innovation.

Ferritic stainless steel with excellent wrinkle resistance

A stainless steel, excellent technology, applied in the direction of improvement of process efficiency, etc., can solve the problem of reduced processability, etc., and achieve the effect of excellent wrinkle resistance

Active Publication Date: 2022-01-18
NIPPON STEEL STAINLESS STEEL CORP
View PDF15 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since Si lowers the workability, Mg-based oxides are effectively used as solidification nuclei of δ-Fe instead of TiN.

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
  • Ferritic stainless steel with excellent wrinkle resistance
  • Ferritic stainless steel with excellent wrinkle resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0129] In the secondary refining, deoxidation and slag adjustment by Al, etc., addition of metal Mg, Mg alloy, Ti alloy, etc., are performed to control the composition and the amount and composition of inclusions, and smelting is performed. The molten steel of the indicated composition was cast and hot rolled. Regarding the MgO in the slag during the secondary refining, the activities based on pure MgO solids are collectively shown in Table 1. Further, hot-rolled sheet annealing and pickling were carried out, and cold rolling, annealing, and pickling were carried out to manufacture a 1.0 mm-thick cold-rolled sheet for inclusion measurement and wrinkle height measurement. Furthermore, as will be described later, some castings were stopped on the way.

[0130] Regarding the inclusion composition, taking the cross section perpendicular to the rolling direction of the cold-rolled sheet as the observation plane, 100 inclusions including oxides with a major diameter of 1.0 μm or mo...

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

An object of the present invention is to stably provide a ferritic stainless steel that ensures corrosion resistance and is excellent in wrinkling resistance. A ferritic stainless steel excellent in wrinkling resistance, characterized in that it contains a predetermined chemical composition, where composite inclusions containing oxides and having a major axis of 1 μm or more are referred to as composite inclusions (A), and the When composite inclusions (A) satisfying (Formula 1) to (Formula 3) are recorded as composite inclusions (B), the number of composite inclusions (B) is relative to the number of composite inclusions The number ratio of the number of (A) satisfies (Formula 4), and the number density of the composite inclusions (B) whose major axis is 2 μm or more and 15 μm or less is 2 pieces / mm 2 More than 20 pieces / mm 2 the following. al 2 o 3 / MgO≤4···(Formula 1); CaO≤20%···(Formula 2); Al 2 o 3 +MgO≥75%...(Formula 3); Number of Composite Inclusions (B) / Composite Inclusions (Number of A)≥0.70...(Formula 4).

Description

technical field [0001] The present invention relates to ferritic stainless steels. Background technique [0002] Ferritic stainless steels have come to be widely used because of their high corrosion resistance and workability, but, on the other hand, they have a problem of wrinkling. Wrinkles are continuous ridge-like wrinkles that are generated on the surface of the steel sheet during forming. The wrinkle impairs the designability, and requires grinding or the like to remove it, which is a large burden on the manufacturing. In order to suppress wrinkling, it is effective to refine the solidified structure by increasing the equiaxed crystal ratio at the time of casting, refining the columnar crystal diameter, and the like, and a method of actively and effectively utilizing inclusions is known. Specifically, spinel (MgO·Al 2 O 3 ), a method of dispersing Mg-Al-based oxides and TiN in molten steel. δ-Fe, which is a solidification primary crystal of ferritic stainless stee...

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): C22C38/00C22C38/28C22C38/60
CPCC22C38/28C22C38/60C22C38/44C22C38/54C22C38/04C22C38/001C22C38/005C22C38/42C22C38/46C22C38/002C22C38/48C22C38/52C22C38/06C22C38/02C22C38/50C22C38/008C22C38/004C22C33/0235C22C32/001
Inventor 金子农渊上胜弘井上宜治
Owner NIPPON STEEL STAINLESS STEEL CORP