KR940004065A - Manufacturing method of tough, high-clean non-manufactured medium bar by normalizing - Google Patents

Manufacturing method of tough, high-clean non-manufactured medium bar by normalizing Download PDF

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Publication number
KR940004065A
KR940004065A KR1019920015562A KR920015562A KR940004065A KR 940004065 A KR940004065 A KR 940004065A KR 1019920015562 A KR1019920015562 A KR 1019920015562A KR 920015562 A KR920015562 A KR 920015562A KR 940004065 A KR940004065 A KR 940004065A
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KR
South Korea
Prior art keywords
steel
normalizing
formation
tough
manufacturing
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KR1019920015562A
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Korean (ko)
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KR940008059B1 (en
Inventor
조윤성
왕성도
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장양술
기아특수강 주식회사
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Priority to KR1019920015562A priority Critical patent/KR940008059B1/en
Publication of KR940004065A publication Critical patent/KR940004065A/en
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Publication of KR940008059B1 publication Critical patent/KR940008059B1/en

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

본 발명에 의한 고강도 비조질 봉강의 제조방법은 중량%로 C : 0.3-0.50%, Mn:0.90-1.5%, S:0.015% max, V:0.07-0.15%이고, 나머지는 철 및 전기로 조업시 불가피한 불순물로 이루어지고 더욱이 저산소제강법에 의해 청정도를 향상시킨 V첨가 중탄소강을 비교적 경제적으로 관리가 용이한 통상의 열간압연 후 제조비용이 저렴한 연속실열처리로에서 노르말라이징 처리함으로써 직경 80㎜이상의 중형 봉강에서도 강도가 80㎏/㎟이상, 상온 충격치가 9.0/㎠ 이상이며 소지홈 발생 및 거대개재물 형성에 의한 표면 처리불량이 극히 억제된 양질의 고강도 비조질 봉강을 얻을 수 있다.The method for producing a high strength non-bar steel bar according to the present invention is by weight% C: 0.3-0.50%, Mn: 0.90-1.5%, S: 0.015% max, V: 0.07-0.15%, the rest is iron and electric operation Medium-sized steel with a diameter of 80 mm or more by normalizing the V-added heavy carbon steel, which is made of unavoidable impurities and improved by the low-oxygen steel method, in a continuous heat treatment furnace that is relatively inexpensive and easy to manage after ordinary hot rolling. Even in steel bars, high-quality high-strength non-steel bars can be obtained with strengths of 80 kg / mm2 or more, room temperature impact values of 9.0 / cm2 or more, and extremely poor surface treatment defects caused by the formation of holding grooves and formation of large inclusions.

Description

노르말라이징에 의한 강인, 고청정 비조질 중형봉강의 제조방법Manufacturing method of tough, high-clean non-manufactured medium bar by normalizing

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

Claims (1)

중량%로 C : 0.3-0.50%, Si : 0.15-0.50%, Mn : 0.90-1.5%, S : 0.150% max., V : 0.07-0.15%, Al : 0.015-0.050%이고, 나머지는 철로 이루어지고 산소량 0.002%이하, 비금속개재물 0.10%이하를 함유한 강을 1100-1250℃의 온도로 가열, 단련비 10S이상으로 사상온도 850-1000℃에서 열간압연을 행하고 연속식 열처리로에서 880-950℃로 노르말라이징 후 팬에 의해 5-100℃/min으로 소재 중심부가 300℃이하까지 되도록 균일 냉각시킨 직경 80mm이상의 비조질 중형봉강의 제조방법.By weight, C: 0.3-0.50%, Si: 0.15-0.50%, Mn: 0.90-1.5%, S: 0.150% max., V: 0.07-0.15%, Al: 0.015-0.050%, and the rest is made of iron. The steel with oxygen content of 0.002% or less and 0.10% or less of non-metallic inclusions is heated to a temperature of 1100-1250 ° C, hot rolled at a finishing temperature of 850-1000 ° C with a anneal ratio of 10S or higher, and 880-950 ° C in a continuous heat treatment furnace. A method for producing a crude medium bar with a diameter of 80 mm or more which is uniformly cooled so that the center of the material is 300 ° C. or less at 5-100 ° C./min by a fan after normalizing. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019920015562A 1992-08-28 1992-08-28 Making method of non-heat treatment steel bar KR940008059B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019920015562A KR940008059B1 (en) 1992-08-28 1992-08-28 Making method of non-heat treatment steel bar

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019920015562A KR940008059B1 (en) 1992-08-28 1992-08-28 Making method of non-heat treatment steel bar

Publications (2)

Publication Number Publication Date
KR940004065A true KR940004065A (en) 1994-03-14
KR940008059B1 KR940008059B1 (en) 1994-09-01

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ID=19338639

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019920015562A KR940008059B1 (en) 1992-08-28 1992-08-28 Making method of non-heat treatment steel bar

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100383435B1 (en) * 1999-10-28 2003-05-12 주식회사종근당 A process for preparing acarbose with high purity
KR100463738B1 (en) * 1996-09-13 2005-05-03 바이엘 헬스케어 아게 Osmotic controlled fermentation method for the production of acarbose

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100463738B1 (en) * 1996-09-13 2005-05-03 바이엘 헬스케어 아게 Osmotic controlled fermentation method for the production of acarbose
KR100383435B1 (en) * 1999-10-28 2003-05-12 주식회사종근당 A process for preparing acarbose with high purity

Also Published As

Publication number Publication date
KR940008059B1 (en) 1994-09-01

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