Metastable austenite stainless steel strip or steel sheet and manufacturing method thereof
a technology of stainless steel and austenite, which is applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of high ductility steel, high cost of additional elements, and difficulty in cold rolling process, etc., and achieve high formability, high strength, and high strength
Inactive Publication Date: 2018-02-08
TOKUSHU KINZOKU EXCEL
View PDF3 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The present invention achieves both high strength and ductility in a stainless steel strip or sheet. This allows for the design of components with more complicated shapes. The steel contains Cr, Ni, and has superior corrosion resistance, which means it may not require an antirust surface treatment after manufacturing. The steel has a high 0.2 proof stress and elongation, outperforming conventional metastable austenitic stainless steels.
Problems solved by technology
However, such a high strength and high ductility steel requires expensive cost of additional elements and has difficulty to be subjected to a cold rolling process to manufacture a steel strip and a steel sheet.
Furthermore, since many conventional steels do not contain Cr, corrosion resistance is insufficient, and thus, an antirust process is required.
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
examples
[0089]Now, examples will be explained together with comparative examples.
[0090]Example steel 1 and comparative steels 2 to 4 with different amounts of Mo were prepared. Chemical compositions thereof are shown in Table 1. In the steel of Example 1 in Table 1, steels (samples of Identification 1 to 5) having the metallic structure within the scope of the present invention and steels having metallic structures outside the scope of the present invention (samples of Identification 6 and 7) were manufactured. The metallic structures of the steels are shown in Table 2. Furthermore, manufacturing conditions of the steels are shown in Table 3. As to each of the manufactured steels (samples of Identifications 1 to 7), hardness (HV), tensile strength (Ts), 0.2% yield strength (YS), and elongation (EL) were measured and shown in Table 4, respectively. Note that, in Tables 1 to 4, a mark * indicates that the value therewith is out of the scope of the present invention.
TABLE 1(Composition)Chemica...
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
| Property | Measurement | Unit |
|---|---|---|
| yield strength | aaaaa | aaaaa |
| elongation | aaaaa | aaaaa |
| yield strength | aaaaa | aaaaa |
Login to View More
Abstract
A metastable austenite stainless steel strip of high strength and ductility. The steel strip including C: 0.05 to 0.15%, Si: 0.05 to 1%, Mn: 2% or less, Cr: 16 to 18%, Ni: 4 to 11%, Mo: 2.5 to 3.5%, Cu: 0.4 to 1.0% with a remaining part of Fe, a dual phase structure of an α′ phase and a γ phase where the γ phase is composed of a γT phase and a γR phase, a sum of the γT phase and the γR phase is 15 to 50 volume %, and a γT phase area ratio defined by formula (2) (=100×(total area ratio of γT phase of entire observation area)) is between 1% and 20% inclusive, and 0.2% yield strength (YS) of 1400 N / mm2 to 1900 N / mm2 where a value of YS-EL balance satisfies at least 21,000 to 48,000.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a Continuation Application of PCT Application No. PCT / JP2017 / 020147, filed May 30, 2017 and based upon and claiming the benefit of priority from prior Japanese Patent Applications No. 2016-109695, filed Jun. 1, 2016; and No. 2016-225085, filed Nov. 18, 2016, the entire contents of all of which are incorporated herein by reference.BACKGROUND OF THE INVENTIONField of the Invention[0002]The present invention relates to a metastable austenite stainless steel strip or steel sheet having well-γ balanced strength and ductility and a manufacturing method of the same.Description of the Related Art[0003]Functioning members of devices such as smartphones, clamshell computers, and cameras and highly durable frame structure members of automobiles and airplanes are required to be thinned and lightened through a reinforcement process while their workability and size accuracy are maintained satisfactorily. Furthermore, when the device...
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
Login to View More Patent Type & Authority Applications(United States)
IPC IPC(8): C21D9/52C22C38/04C21D6/00C22C38/00C21D9/46C21D8/02C22C38/44C22C38/02
CPCC21D9/52C22C38/44C22C38/04C22C38/02C22C38/002C22C38/001C21D9/46C21D8/0247C21D8/0236C21D8/0205C21D6/008C21D6/005C21D6/004C21D2211/008C21D2211/001C22C38/00C22C38/58C22C38/42
Inventor MATSUMURA, YUTAOGAWA, KYOUHEITANAKA, SHINICHIHOSOYA, YOSHIHIROHIRATA, TATSUMI
Owner TOKUSHU KINZOKU EXCEL