KR970043150A - Manufacturing method of high tensile strength steel for line pipe with excellent cryogenic impact toughness - Google Patents

Manufacturing method of high tensile strength steel for line pipe with excellent cryogenic impact toughness Download PDF

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Publication number
KR970043150A
KR970043150A KR1019950049561A KR19950049561A KR970043150A KR 970043150 A KR970043150 A KR 970043150A KR 1019950049561 A KR1019950049561 A KR 1019950049561A KR 19950049561 A KR19950049561 A KR 19950049561A KR 970043150 A KR970043150 A KR 970043150A
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South Korea
Prior art keywords
high tensile
steel
impact toughness
manufacturing
temperature range
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KR1019950049561A
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Korean (ko)
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KR100256352B1 (en
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박찬엽
소문섭
박종수
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김종진
포항종합제철 주식회사
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Priority to KR1019950049561A priority Critical patent/KR100256352B1/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
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C21D9/085—Cooling or quenching
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese

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

Abstract

본 발명은 유전 및 천연가스 수송관의 소재로 사용되는 라인 파이프용 고장력 강재의 제조방법에 관한 것이며, 그 목적은 극저온환경에서 충격인성이 우수한 라인 파이프용 고장력 강재의 제조방법을 제공하고자 하는데있다. 본 발명은 라인 파이프용 고장력 강재의 제조방법에 있어서, 중량%로, C:0.08-0.11%, Si:0.20-0.30%, Mn:1.50-1.60%, P:0.020% 이하, S:0.003% 이하, Nb:0.035-0.045%, V:0.055-0.065%, Ti:0.005-0.015%, Sol-Al:0.020-0.040%, 나머지 Fe 및 기타불가피한 불순물로 이루어진 용강을 노외정렬시 Ca-Si로 개재물을 구상화처리한 다음 구상화 처리된 슬라브를 재가열하고, 조압연한 후 조압연된 강재를 잔압하율 70 ±5% 상태에서 미재결정온도역인 870 ±20℃의 온도로부터 사상압연을 개시하여 730 ±20℃의 온도범위에서 마무리 압연을 종료하고 이어서 8-12℃/초의 범위로 520 ±20℃의 온도범위 온도범위까지 가속냉각함을 포함하여 구성되는 극저온 충격인성이 우수한 라인 파이프용 고장력 강재의 제조방법에 관한 것을 그 기술적 요지로 한다.The present invention relates to a method for manufacturing a high tensile steel for line pipes used as a material for oil and natural gas transport pipe, the object is to provide a method for producing a high tensile steel for line pipes excellent impact toughness in cryogenic environment. The present invention is a method for producing a high-tensile steel for line pipe, by weight, C: 0.08-0.11%, Si: 0.20-0.30%, Mn: 1.50-1.60%, P: 0.020% or less, S: 0.003% or less , Nb: 0.035-0.045%, V: 0.055-0.065%, Ti: 0.005-0.015%, Sol-Al: 0.020-0.040%, and the remaining Fe and other unavoidable impurities in the molten steel Ca After re-heating the spheroidized slab after spheroidization, after rough rolling, the rough-rolled steel is started at finishing temperature of 870 ± 20 ° C, which is the unrecrystallized temperature range, at the residual reduction ratio of 70 ± 5%, and 730 ± 20 ° C. In the method of manufacturing high tensile strength steel for line pipes having excellent cryogenic impact toughness, including finishing cold rolling in the temperature range of and then accelerated cooling to a temperature range of 520 ± 20 ° C in the range of 8-12 ° C / sec. The technical point is about.

Description

극저온충격인성이 우수한 라인 파이프용 고장력강재의 제조방법Manufacturing method of high tensile strength steel for line pipe with excellent cryogenic impact toughness

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

제1도는 종래의 제어압연방식을 설명하는 이력곡선도,1 is a hysteresis curve for explaining a conventional control rolling method,

제2도는 본 발명에 의한 제어압연방식을 설명하는 이력곡선도.2 is a hysteresis curve diagram illustrating a control rolling method according to the present invention.

Claims (2)

라인 파이프용 고장력재의 제조방법에 있어서, 중량%로, C:0.08-0.11%, Si:0.20-0.30%, Mn:1.50-1.60%, P:0.020% 이하, S:0.003% 이하, Nb:0.035-0.045%, V:0.055-0.065%, Ti:0.005-0.015%, Sol-Al:0.020-0.040%, 나머지 Fe 및 기타불가피한 불순물로 이루어진 용강을 노외정렬시 Ca-Si로 개재물을 구상화처리한 다음 구상화 처리된 슬라브를 재가열하고, 조압연한 후 조압연된 강재를 잔압하율 70 ±5% 상태에서 미재결정온도역인 870 ±20℃의 온도로부터 사상압연을 개시하여 730 ±20℃의 온도범위에서 마무리 압연을 종료하고 이어서 8-12℃/초의 범위로 520 ±20℃의 온도범위까지 가속냉각함을 포함하여 구성되는 것을 특징으로 하는 극저온 충격인성이 우수한 라인 파이프용 고장력 강재의 제조방법.In the method for producing a high tensile material for line pipe, in weight%, C: 0.08-0.11%, Si: 0.20-0.30%, Mn: 1.50-1.60%, P: 0.020% or less, S: 0.003% or less, Nb: 0.035 The inclusion of -0.045%, V: 0.055-0.065%, Ti: 0.005-0.015%, Sol-Al: 0.020-0.040%, remaining Fe and other unavoidable impurities, spheroidized the inclusions with Ca-Si when out-aligned After reheating the spheroidized slab, after rough rolling, the rough rolled steel is started at finishing temperature of 870 ± 20 ℃, which is the unrecrystallized temperature range, at the residual pressure reduction rate of 70 ± 5%. A method of manufacturing high tensile strength steel for line pipes having excellent cryogenic impact toughness, comprising: finishing finishing rolling, followed by accelerated cooling to a temperature range of 520 ± 20 ° C. in a range of 8-12 ° C./sec. 제1항에 있어서, 상기 구상화처리에 투입되는 Ca-Si는 파우더 인젝션(Powder injection)처리시 전체 Ca-Si 투입량의 50%, 진공탈가스 처리시 전체 Ca-Si 투입량의 50%로 하여 첨가함을 특징으로 하는 극저온 충격인성이 우수한 라인파이프용 고장력 강재의 제조방법The method of claim 1, wherein the Ca-Si added to the spheroidizing treatment is added as 50% of the total Ca-Si input during the powder injection treatment and 50% of the total Ca-Si input during the vacuum degassing treatment. Method for manufacturing high tensile steel for line pipes having excellent cryogenic impact toughness
KR1019950049561A 1995-12-14 1995-12-14 The manufacturing method for high strength steel sheet used line pipe with excellent ultra low temperature impact toughness KR100256352B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100435445B1 (en) * 1996-10-22 2004-08-25 주식회사 포스코 Manufacturing method of high tensile strength plate for line pipes characterizing superior impact toughness and resistance to hydrogen induced cracking in ultra-low temperature environment

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100435465B1 (en) * 1999-12-20 2004-06-10 주식회사 포스코 A METHOD FOR MANUFACTURING YS 63kgf/㎟ GRADE THICK STEEL SHEET WITH SUPERIOR LOW TEMPERATURE TOUGHNESS

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3274013B2 (en) * 1994-03-04 2002-04-15 新日本製鐵株式会社 Method for producing sour resistant high strength steel sheet having excellent low temperature toughness
JPH07286214A (en) * 1994-04-18 1995-10-31 Nippon Steel Corp Production of high strength thick hot coil excellent in hydrogen induced cracking resistance and dwtt property

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100435445B1 (en) * 1996-10-22 2004-08-25 주식회사 포스코 Manufacturing method of high tensile strength plate for line pipes characterizing superior impact toughness and resistance to hydrogen induced cracking in ultra-low temperature environment

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