High-silicon stainless

a technology of stainless steel and high-silicon, which is applied in the field of high-silicon stainless steel, can solve the problems of insufficient corrosion resistance, difficult subsequent finishing work, and few materials can meet all of these requirements, and achieve the effects of high si content, corrosion resistance, and high strength

Inactive Publication Date: 2004-03-04
SHIMIZU YOSHIYUKI
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  • Claims
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Benefits of technology

0027] The above-mentioned high-silicon stainless steel is a steel having a dual phase structure mainly composed of austenite and ferrite. Owing to its high Si content as compared with ordinary stainless steels, this steel has both corrosion resistance and high strength and shows good fluidity on the occasion of casting. Furt...

Problems solved by technology

This is because the material cost accounts for a great proportion of the total cost in the production of large-sized or mass-produced instruments and apparatus.
However, very few materials can meet all of such requirements.
These are quench-hardenable stainless steels and are excellent in hardness, strength and wear resistance but are ...

Method used

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[0139] 1. Materials Used

[0140] Thirty-six steels specified in FIG. 2 and FIG. 3 were used as test materials. These steels could be divided into groups of three (e.g. steels Nos. 1 to 3, steels Nos. 4 to 6, . . . ) and the three in each group were of the same steel group. In the three steels, one marked with .DELTA. is a comparative steel having relatively high impurity levels, one marked with .largecircle. is a steel according to the invention having a high cleanliness index with suppressed impurity levels, and one marked with .circleincircle. is a steel according to the invention having an ultrahigh cleanliness index with still further decreased impurity levels. Steels Nos. 34, 35 and 36 are the conventional steels (commercial ones), corresponding to JIS SUS 304, SUS 630 and SUS 420 J2, respectively.

[0141] Each of the above test materials was hot-forged into a round bar with a diameter of 20 mm and this round bar was subjected to solution heat treatment 1 under the conditions shown...

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Abstract

A high-Si stainless steel excellent in various characteristics, inclusive of strength, corrosion resistance, workability and castability, consists of, on the mass % basis, Si: 2 to 5%, Cr: 8 to 25%, Ni: 4 to 16%, Mn: not more than 5%, Cu: not more than 4%, Co: not more than 8%, Mo: not more than 4%, Nb: not more than 3%, Ta: not more than 3%, Ti: not more than 3%, W: not more than 4%, V: not more than 4%, B: not more than 0.01%, Mg: not more than 0.01%, Ca: not more than 0.01%, rare earth elements: not more than 0.01%, the balance being Fe. Impurities in this steel are as follows: C: not more than 0.04%, P: not more than 0.03%, S: not more than 0.02%, Al: not more than 0.03%, N (nitrogen): not more than 0.05%, O (oxygen): not more than 0.005%, and H (hydrogen): not more than 0.0003%.

Description

[0001] The present invention relates to a high-silicon stainless steel having excellent corrosion resistance and high strength as fundamental characteristics and, in addition, having various characteristics such as fatigue resistance, heat resistance, castability and workability.[0002] Typical metallic materials excellent in corrosion resistance are stainless steels. The field of application of stainless steels covers a wide range and, in recent years, stainless steels are used for not only corrosion resistance material but also various materials that should have characteristics such as mentioned below.[0003] (1) Fatigue Resistance Characteristics[0004] The uses requiring fatigue resistance are, for example, springs, gears, driving shafts, and the like. A special use is core wires of inter-tooth brush.[0005] (2) Heat Resistance[0006] High Cr steels, such as stainless steels, are generally excellent in heat resistance. In addition to such general heat resistance, the resistance again...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/34C22C38/42C22C38/44C22C38/48C22C38/50C22C38/52C22C38/58
CPCC22C38/04C22C38/34C22C38/42C22C38/58C22C38/48C22C38/50C22C38/52C22C38/44
Inventor SHIMIZU, YOSHIYUKI
Owner SHIMIZU YOSHIYUKI
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