Ferritic stainless steel sheet, method for producing same, and ferritic stainless steel member

A stainless steel and system technology, applied in the field of ferritic stainless steel plate and its manufacturing, and ferritic stainless steel components, can solve the problems of poor formability of stainless steel plate, limited use parts, limited use and part shape, etc.

Active Publication Date: 2020-11-17
NIPPON STEEL STAINLESS STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the formability of ferritic stainless steel sheets is poor, so the application and shape of parts are sometimes limited
For this reason, when a ferritic stainless steel sheet is used as the above-mentioned parts, its use location etc. may be limited.

Method used

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  • Ferritic stainless steel sheet, method for producing same, and ferritic stainless steel member
  • Ferritic stainless steel sheet, method for producing same, and ferritic stainless steel member
  • Ferritic stainless steel sheet, method for producing same, and ferritic stainless steel member

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0272] The steel with the composition shown in Table 1 was melted, cast into a slab, and hot-rolled under the conditions of a slab heating temperature of 1150°C and a coiling temperature of 500°C to produce a hot-rolled steel sheet.

[0273] [Table 1]

[0274]

[0275] Thereafter, the pickled hot-rolled steel sheet was cold-rolled to the thickness shown in Table 2 using rolls with a diameter of 400 to 500 mm, and continuous annealing and pickling were performed. In this way, the r-value measurement and the crystal orientation strength measurement were performed on the obtained cold-rolled annealed sheet.

[0276] The r value was carried out by the method described above in accordance with JIS Z 2254. Test pieces were taken from directions parallel to the rolling direction, 45°, and 90° to obtain the r value, and then calculate the average r value. Specifically, the JIS13 No. B tensile test piece is taken, and the above-mentioned value is calculated by a predetermined metho...

Embodiment 2

[0284] Table 3 shows properties when the steel types described in Table 1 were produced under the production conditions shown in Table 3. Evaluation of formability was performed under the same conditions as in Example 1 by a cylindrical deep drawing test.

[0285] In Table 3, as in Table 2, the case where formability was possible was marked as ○, the case where necking occurred near the punch shoulder was marked as △, and the case where forming cracks occurred during the process was marked as ×.

[0286] [table 3]

[0287]

[0288] Examples C1 to C3 of the present invention shown in Table 3 have good r values ​​and processability because their compositions are within the range specified by the present invention and the production conditions satisfy the preferred conditions in the present invention. On the other hand, the production conditions of Comparative Examples c1 to c6 deviated from the preferred production conditions in the present invention. Therefore, the crystal...

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Abstract

A ferrite-based stainless steel sheet has a chemical composition comprising, by mass%, C: 0.001-0.020%, Si: 0.02-1.50%, Mn: 0.02-1.50%, P: 0.01-0.05%, S: 0.0001-0.01%, Cr: 10.0-25.0%, Ti: 0.01-0.30%,N: 0.001-0.030%, an optional element, and the balance Fe and inevitable impurities, has a grain size number of 6 or higher, satisfies [A+B>= 12.0 / t], [X+Y>= 12.0 / (t - 0.3)], and [(X+Y) - (A+B) <= 5.0]in terms of crystal orientation strength of the ferrite phase as measured by X-ray diffraction, and has a sheet thickness of 1.0 mm or more. Here, in the formulas, t represents sheet thickness (mm),A represents {111} <112> crystal orientation strength of sheet thickness center part, B represents {111} <112> crystal orientation strength of 1 / 4 sheet thickness part, X represents {322} <236> crystal orientation strength of the sheet thickness center part, and Y represents {322} <236> crystal orientation strength of the 1 / 4 sheet thickness part.

Description

technical field [0001] The present invention relates to a ferritic stainless steel sheet, a method for producing the same, and a ferritic stainless steel member. Background technique [0002] Ferritic stainless steel sheets are used in a wide range of fields such as home appliances, kitchen equipment, and electronic equipment. In addition, in recent years, applications of stainless steel sheets have been studied as materials used for exhaust pipes of automobiles and motorcycles, fuel tanks, and pipes. [0003] The above exhaust system components are required to have corrosion resistance and heat resistance in the exhaust environment and the fuel environment. In addition, the above-mentioned members are formed into a target shape after press working from a steel plate or forming a steel pipe of a predetermined size (diameter) from a steel plate. Therefore, high workability is required for the raw steel plate used for parts. [0004] In addition, in response to environmenta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/60
CPCC21D9/46C22C38/60C22C38/004C22C38/02C22C38/04C22C38/18C22C38/28C22C38/001C21D2211/005C21D2201/05C22C38/26C22C38/22C22C38/24C22C38/32C22C38/008C22C38/002C22C38/20C22C38/06C22C38/005C22C38/10C21D8/0205C21D8/0236C21D8/0273C21D8/0242C21D1/74C22C38/54C22C38/52C22C38/50C22C38/46C22C38/44C22C38/42C21D8/0221C21D8/0226C22C38/08C22C38/12C23G1/00
Inventor 西村航井上宜治滨田纯一
Owner NIPPON STEEL STAINLESS STEEL CORP
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