KR940014848A - Manufacturing method of 150KSi high strength steel at yield strength - Google Patents

Manufacturing method of 150KSi high strength steel at yield strength Download PDF

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Publication number
KR940014848A
KR940014848A KR1019920024972A KR920024972A KR940014848A KR 940014848 A KR940014848 A KR 940014848A KR 1019920024972 A KR1019920024972 A KR 1019920024972A KR 920024972 A KR920024972 A KR 920024972A KR 940014848 A KR940014848 A KR 940014848A
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KR
South Korea
Prior art keywords
high tensile
temperature
yield strength
rolling
temperature range
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KR1019920024972A
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Korean (ko)
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KR950004775B1 (en
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홍순택
주응용
Original Assignee
박득표
포항종합제철 주식회사
백덕현
재단법인산업과학기술연구소
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Priority to KR1019920024972A priority Critical patent/KR950004775B1/en
Publication of KR940014848A publication Critical patent/KR940014848A/en
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Publication of KR950004775B1 publication Critical patent/KR950004775B1/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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips

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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 발명은 심해구조용 강재, 심해탐사선의 선각재, 압력용기등에 사용되는 고장력강을 제조하는 방법에 관한 것으로서, 통상의 항복강도 130ksi급 고장력강에 직접 소입공정을 도입하므로서 저온인성의 저하없이 항복강도를 20ksi정도 개선시키고자 하는데, 그 목적이 있다.The present invention relates to a method for manufacturing high tensile steel used for deep sea structural steel, hull hulls of deep sea probes, pressure vessels, etc., 20 ksi yield strength without degradation of low temperature toughness by introducing a hardening process directly into the high tensile steel 130 ksi class To improve the degree, the purpose is.

본 발명은 항복강도 130ksi급 고장력강 슬라브를 1150-1300℃의 온도범위에서 충분히 가열한 후, 각 압연패스당 10-30%의 압하율 및 750-900℃의 압연종료 온도조건으로 열간압연 한 다음, 30초 이내에 10-50℃/sec의 냉각속도로 상온까지 수냉한 후, Ac1온도이하인 500-620℃의 온도범위에서 템퍼링하여 항복강도 150ksi급 고장력강을 제조하는 방법을 그 요지로 한다.In the present invention, the yield strength 130ksi class high tensile steel slab is sufficiently heated in the temperature range of 1150-1300 ℃, and hot rolled at 10-30% reduction rate and rolling finish temperature conditions of 750-900 ℃ after each rolling pass, After cooling water to room temperature at a cooling rate of 10-50 ° C./sec within 30 seconds, and tempering in a temperature range of 500-620 ° C. below Ac 1 temperature, a method of producing a 150 ksi class high tensile strength yield strength is provided.

Description

항복강도 150ksi급 고장력강의 제조방법Yield strength 150ksi class high tensile steel manufacturing method

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

제1도는 종래방법 및 본 발명에 따라 고장력강을 제조하는 공정을 개략적으로 나타내는 공정개략도.1 is a process schematic diagram showing a conventional method and a process for producing high tensile steel according to the present invention.

Claims (1)

중량%로, C :0.005-0.12%, Mn :0.6-0.9%, Si :0.20-0.35%, Cr :0.4-0.7%, Ni :4.75-5.50%, Mo :0.30-0.65%, V :0.05~0.10%, P :100ppm 이하, S :150ppm 이하, 잔부 Fe 및 기타 불가피한 불순물로 조성되는 강 슬라브를 1150-1300℃의 온도범위에서 충분히 가열한 후, 각 압연패스(pass)당 10-30%의 압하율 및 750-900℃의 압연종료 온도조건으로 열간압연한 다음, 30초 이내에 10-50℃/sec의 냉각속도로 상온까지 수냉한 후, Ac1온도 이하인 500-620℃의 온도범위에서 템퍼링하는 것을 특징으로 하는 항복강도 150ksi급 고장력강의 제조방법.By weight%, C: 0.005-0.12%, Mn: 0.6-0.9%, Si: 0.20-0.35%, Cr: 0.4-0.7%, Ni: 4.75-5.50%, Mo: 0.30-0.65%, V: 0.05 ~ Steel slab composed of 0.10%, P: 100ppm or less, S: 150ppm or less, balance Fe and other unavoidable impurities is sufficiently heated in a temperature range of 1150-1300 ° C, and then 10-30% of each rolling pass. After hot rolling with the rolling reduction and rolling finish temperature conditions of 750-900 ° C., water was cooled to room temperature at a cooling rate of 10-50 ° C./sec within 30 seconds, and then tempered at a temperature range of 500-620 ° C. below Ac 1 temperature. Yield strength 150ksi class high tensile strength steel manufacturing method characterized in that. ※참고사항:최초출원 내용에 의하여 공개하는 것임.※ Note: This is to be disclosed based on the first application.
KR1019920024972A 1992-12-22 1992-12-22 Making mehtod of 150kg high strength steel KR950004775B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019920024972A KR950004775B1 (en) 1992-12-22 1992-12-22 Making mehtod of 150kg high strength steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019920024972A KR950004775B1 (en) 1992-12-22 1992-12-22 Making mehtod of 150kg high strength steel

Publications (2)

Publication Number Publication Date
KR940014848A true KR940014848A (en) 1994-07-19
KR950004775B1 KR950004775B1 (en) 1995-05-10

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Application Number Title Priority Date Filing Date
KR1019920024972A KR950004775B1 (en) 1992-12-22 1992-12-22 Making mehtod of 150kg high strength steel

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20106275A (en) 2010-12-02 2012-06-03 Rautaruukki Oyj Ultra high strength structural steel and a process for producing ultra high strength structural steel

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KR950004775B1 (en) 1995-05-10

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