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PRODUCTION OF THE HIGH STRENGTH AUSTENITIC STAINLESS STEEL SHEET HAVING ULTRAFINE GRAIN

Research Project

Project/Area Number 62850135
Research Category

Grant-in-Aid for Developmental Scientific Research

Allocation TypeSingle-year Grants
Research Field 金属材料(含表面処理・腐食防食)
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

TOKUNAGA Youichi  KYUSHU UNIV. FACULTY OF ENGINEERING, 工学部, 教授 (60037710)

Co-Investigator(Kenkyū-buntansha) 星野 和夫  日新製鋼周南製鋼所, 生産管理部, 部長
TAKAKI Setsuo  KYUSHU UNIV. FACULTY OF ENGINEERING, 工学部, 助教授 (90150490)
HOSHINO Kazuo  NISSHIN STEEL CO., LTD. SHUNAN WORKS
Project Period (FY) 1987 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥7,600,000 (Direct Cost: ¥7,600,000)
Fiscal Year 1988: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1987: ¥6,700,000 (Direct Cost: ¥6,700,000)
KeywordsUltrafine Grain / High Strength / Austenitic Stainless Steel / Deformation Induced Transformation / Martensite / Reversion / プレス成形性
Research Abstract

Investigators have already succeeded in super grain refining to 0.5mum of metastable austenitic stainless steels based of Fe-Cr-Ni system by martensite austenite reversion. The purpose of this present work is to found that three conditions should be satisfied for the grain super refining : (1) Austenite transforms to martensite almost all, by cold rolling. (2) The martensite perfectly reverses to austenite by annealing at relatively low temperature. (3) Ms temperature of the reversed austenite exist under the room temperature. Next purpose is to determine the suitable chemical composition for the high strength steel containing molybdenum and nitrogen. Lastly, using 370kg ingot, the thermo-mechanical treatments were carried out on the pilot line in steel works. And then, the tensile properties and press formabilities were examined. Results obtained were as follows;
1. Typical composition of ultrafine grain steel in Fe-Cr-Ni system was Fe-15.5%Cr-10%Ni. A specimen with 90% cold rolling prior to annealing of 600゜C-10min. has the ultrafine grain with the mean size of 0.5mum,giving 0.2% proof stress of about 70kgf/mm^2.
2. The strength of 13%Cr-10%Ni-2.5%Mo-0.12%N steel increased in comparison with 15.5%Cr-10%Ni steel. It is attributed to refining of austenite grain rather than solid soution hardening by molybdenum and nitrogen. After reversion treatment, this high strength steel has an austenite grain of 0.2mum, giving 0.2% proof stress of 100kgf/mm^2, a tensile strength of 120kgf/mm^2 and an elongation of 35% respectively.
3. The texture of this high strength steel was of {110} type. A deep drawability was not enough, because both values of n and r were relatively lower than 18-8 austenitic steel. Therefore,this steel will be able to used for the parts not required the severe forming, for example, austenitic stainless for railroad vihicles.

Report

(2 results)
  • 1988 Annual Research Report   Final Research Report Summary
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 高木節雄: 鉄と鋼. 74. 1052-1057 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 高木節雄: 鉄と鋼. 74. 1058-1064 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 冨村宏紀: 熱処理. 28. 274-278 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] TAKAKI, SETSUO: "OPTIMAL CHEMICAL COMPOSITION IN Fe-Cr-Ni ALLOYS FOR ULTRA GRAIN REFINING BY REVERSION OF DEFORMATION INDUCED MARTENSITE" JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN. 74. 1052-1057 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] TAKAKI, SETSUO: "STRENGTHNING OF METASTABLE 16-10 AUSTENITIC STAINLESS STEEL BY ULTRA GRAIN REFINING" JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN. 74. 1058-1064 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] TOMIMURA, KOUKI: "SUPER GRAIN REFINING OF AUSTENITIC STAINLESS STEELS BY A THERMO-MECHANICAL TREATMENT" JOURNAL OF THE JAPAN SOCIETY FOR HEAT TREATMENT. 28. 274-278 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 高木節雄: 鉄と鋼. 74. 1052-1057 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 高木節雄: 鉄と鋼. 74. 1058-1064 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 冨村宏紀: 熱処理. 28. 274-278 (1988)

    • Related Report
      1988 Annual Research Report

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Published: 1987-04-01   Modified: 2016-04-21  

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