Sub-stabilisation austenitic stainless steel belt of weary characteristic fine used by metal shrapnel and metal shrapnel

A technology of austenitic stainless steel and metal shrapnel, which is applied to improve the fatigue properties under high stress. In the field of metal shrapnel, it can solve the problems of no improvement in durability, no clear durability, and difference in durability, and achieve the effect of excellent fatigue properties.

Active Publication Date: 2005-11-02
JX NIPPON MINING & METALS CO LTD
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Problems solved by technology

[0005] However, according to the technology described in Patent Document 1, even if the hardness is the same in some cases, there is a large difference in durability, and durability cannot be ensured only by specifying the hardness.
In addition, various proposals have been made to improve the durability of the metal dome by improving the shape of the metal dome or incorporating the substrate of the dome, but none can effectively improve the durability according to the characteristics of the material used for the metal dome. Methods
Furthermore, metal domes using metastable austenitic stainless steel may show changes in durability depending on the processing of the material, but methods for improving the material properties required for improving durability have not been clarified.

Method used

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  • Sub-stabilisation austenitic stainless steel belt of weary characteristic fine used by metal shrapnel and metal shrapnel

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Embodiment Construction

[0017] Next, preferred embodiments of the present invention will be described.

[0018] 1. Production of metal shrapnel

[0019] A raw material bar of austenitic stainless steel (SUS301) with a plate thickness of 1.5mm and solution treated is subjected to repeated cold rolling and recrystallization annealing, and finally processed to a plate thickness of 0.06mm. Stress relief annealing was carried out at a furnace temperature of 500-700° with a residence time in the furnace of 10-40 seconds to obtain raw material strips of samples A-E. Here, all the samples A to E were subjected to repeated cold rolling and recrystallization annealing two or more times, and the above-mentioned stress relief annealing was performed after the final cold rolling. The working degree of samples A, D, and E in cold rolling was 20% to 70%, and in recrystallization annealing, the conditions were adjusted so that the crystal grain size number was in the range of No. 7 to No. 10. In this case, the 0.2...

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Abstract

The invention provides a metatstable austenitic stainless steel strip for metal domes which has high strength and is improved in fatigue properties under high stress by improving the working history of a material. This metastable austenitic stainless steel strip for the metal domes which is excellent in fatigue properties satisfies the next formulas (1), (2), when fatigue strengths to stress amplitudes in the parallel direction to rolling, perpendicular direction to the rolling and in the direction of 45 DEG to the parallel direction to the rolling are respectively expressed by [sigma]parallel, [sigma]perpendicular and [sigma]45 DEG (MPa) in the case a fatigue test is performed with a sheet fatigue testing machine using pulleys. [sigma]perpendicular >450 (MPa) (1), [sigma]parallel and [sigma]45 DEG >550 (MPA) (2).

Description

technical field [0001] The present invention relates to a metastable austenitic stainless steel strip used for making metal domes used in switch parts of portable terminals or household electrical appliances, and metal domes made of the steel strips, and in particular to improving fatigue characteristics under high stress technology. Background technique [0002] For metal domes used in the switch parts of portable terminals and home appliances, etc., the stress repeatedly applied to the metal domes in the environment of the device tends to increase, and the number of repeated loads also tends to increase. Metastable austenitic stainless steel such as SUS301 is generally used as a thin-plate elastic material for producing such a metal dome requiring high strength and high durability. [0003] As the above-mentioned metal dome, it is necessary to have high rigidity so as to be able to maintain stable operation against repeated switching. Metastable austenitic stainless stee...

Claims

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Application Information

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IPC IPC(8): B21B3/02B21D53/00C21D7/02H01H5/30
CPCH02K3/24H02K3/505H02K9/19
Inventor 黑崎郁也深町一彦
Owner JX NIPPON MINING & METALS CO LTD
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