KR970043168A - Manufacturing method of pipe steel with excellent hydrogen organic crack resistance - Google Patents

Manufacturing method of pipe steel with excellent hydrogen organic crack resistance Download PDF

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Publication number
KR970043168A
KR970043168A KR1019950048484A KR19950048484A KR970043168A KR 970043168 A KR970043168 A KR 970043168A KR 1019950048484 A KR1019950048484 A KR 1019950048484A KR 19950048484 A KR19950048484 A KR 19950048484A KR 970043168 A KR970043168 A KR 970043168A
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steel
manufacturing
crack resistance
temperature
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KR1019950048484A
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Korean (ko)
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KR100256347B1 (en
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박종수
박찬엽
소문섭
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김종진
포항종합제철 주식회사
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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
    • C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
    • 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
    • C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
    • 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
    • C21D6/001—Heat treatment of ferrous alloys containing Ni
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite

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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 원유 및 천연가스 수송용 파이프 소재 제조방법에 관한 것이며, 그 목적은 수소유기 균열 저항성이 우수한 인장강도 58kgf/㎟급 라인 파이프용 강재의 제조방법을 제공함에 있다.The present invention relates to a method for producing a pipe material for transporting crude oil and natural gas, and an object thereof is to provide a method for manufacturing a steel material for a line strength of 58 kgf / mm 2 grade line pipe having excellent hydrogen organic crack resistance.

본 발명은 라인 파이프용 후판 강재의 제조방법에 있어서, 중량%로, C:0.07-0.13%, Si:0.35%이하, Mn:0.80-1.20%, 가용성 Al:0.015-0.060%, P:0.020%이하, S:0.003% 이하, Nb:0.020-0.050%, V:0.0320-0.060%, Ti:0.005-0.015%, Cu:0.15-0.33%, Ni:0.10-0.20%, N:70ppm 이하, Ca:50ppm이하, Ca/S의 중량비:0.5-1.8, 나머지 Fe 및 불가피한 불순물로 조성되는 강슬라브를 1150-1320℃의 온도범위에서 가열한 후, 미재결 영역에서 40-70%의 누적 압하율로 제어압연하고 Ar3+25℃까지 급속냉각한 다음, 펄라이트 변태 개시온도 직상까지 13-27℃ 직상의 온도에서 마무리 압연을 행한 다음, 8-13℃의 냉각속도로 500-550℃의 온도범위까지 수냉하고, 이후 상온까지는 공랭함을 포함하여 구성되는 수소유기 균열 저항성이 우수한 파이프용 강재의 제조방법에 관한 것이다.In the manufacturing method of the thick steel plate for line pipes, this invention is C: 0.07-0.13%, Si: 0.35% or less, Mn: 0.80-1.20%, Soluble Al: 0.015-0.060%, P: 0.020% S: 0.003% or less, Nb: 0.020-0.050%, V: 0.0320-0.060%, Ti: 0.005-0.015%, Cu: 0.15-0.33%, Ni: 0.10-0.20%, N: 70 ppm or less, Ca: 50ppm or less, Ca / S weight ratio: 0.5-1.8, steel slab composed of remaining Fe and unavoidable impurities is heated in the temperature range of 1150-1320 ° C, and then controlled by cumulative reduction ratio of 40-70% in the unresolved area Rolling and rapid cooling to Ar3 + 25 ° C., followed by finish rolling at a temperature directly above 13-27 ° C. up to the pearlite transformation start temperature, followed by water cooling to a temperature range of 500-550 ° C. at a cooling rate of 8-13 ° C. And after, to room temperature relates to a method for producing a steel for pipes excellent in hydrogen-organic crack resistance comprising air cooling.

Description

수소유기 균열 저항성이 우수한 파이프용 강재의 제조방법Manufacturing method of pipe steel with excellent hydrogen organic crack resistance

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

제1도는 본 발명재와 비교재에 함유한 CaS 개재물을 나타내는 주사현미경 사진,1 is a scanning micrograph showing the CaS inclusions contained in the present invention and the comparative material,

제2도는 본 발명재와 비교재에 대한 HIC 시험후의 조직을 나타내는 사진임.2 is a photograph showing the structure after the HIC test for the present invention and the comparative material.

Claims (4)

라인 파이프용 강재의 제조방법에 있어서, 중량%로, C:0.07-0.13%, Si:0.35%이하, Mn:0.80-1.20%, 가용성 Al:0.015-0.060%, P:0.020%이하, S:0.003% 이하, Nb:0.020-0.050%, V:0.0320-0.060%, Ti:0.005-0.015%, Cu:0.15-0.33%, Ni:0.10-0.20%, N:70ppm 이하, Ca:50ppm이하, Ca/S의 중량비:0.5-1.8, 나머지 Fe 및 기타 불가피한 불순물로 조성되는 강슬라브를 1150-1320℃의 온도범위에서 가열한 후, 미재결 영역에서 40-70%의 누적 압하율로 제어압연하고 Ar3+25℃ 직상의 온도에서 마무리 압연을 행한 다음, 8-13℃의 냉각속도로 500-550℃의 온도범위까지 수냉하고, 이후 상온까지는 공랭함을 포함하여 구성되는 것을 특징으로 하는 수소유기 균열 저항성이 우수한 파이프용 강재의 제조방법In the manufacturing method of the steel for line pipe, in weight%, C: 0.07-0.13%, Si: 0.35% or less, Mn: 0.80-1.20%, soluble Al: 0.015-0.060%, P: 0.020% or less, S: 0.003% or less, Nb: 0.020-0.050%, V: 0.0320-0.060%, Ti: 0.005-0.015%, Cu: 0.15-0.33%, Ni: 0.10-0.20%, N: 70 ppm or less, Ca: 50 ppm or less, Ca The weight ratio of / S: 0.5-1.8, the steel slab composed of the remaining Fe and other unavoidable impurities is heated in the temperature range of 1150-1320 ° C, and then controlled rolling with a cumulative reduction rate of 40-70% in the uncrystallized region and Ar After finishing rolling at a temperature directly above 3 + 25 ° C, the water is cooled to a temperature range of 500-550 ° C at a cooling rate of 8-13 ° C, and then cooled to room temperature. Manufacturing method of pipe steel with excellent resistance 제1항에 있어서, 상기 강 슬라브중의 Ti/N의 비를 1.0-3.0의 범위로 제어함을 특징으로 하는 수소유기 균열 저항성이 우수한 파이프용 강재의 제조방법.The method of manufacturing a steel sheet for pipes with excellent hydrogen-organic crack resistance according to claim 1, wherein the ratio of Ti / N in the steel slab is controlled in a range of 1.0 to 3.0. 제1항에 있어서, 상기 제어압연은 850-880℃의 온도범위에서 실시함을 특징으로 하는 수소유기 균열 저항성이 우수한 파이프용 강재의 제조방법.The method of claim 1, wherein the control rolling is carried out at a temperature range of 850-880 ° C. 제1항 내지 제3항중 어느 한항에 있어서, Cs/S 비의 제어는 Ca 분말을 파우더 인젝션시와 탈가스 처리시에 투입한 후, 용강을 환류처리하여 행함을 특징으로 하는 수소유기 균열 저항성이 우수한 파이프용 강재의 제조방법.The hydrogen-organic crack resistance according to any one of claims 1 to 3, wherein the control of the Cs / S ratio is performed by introducing Ca powder during powder injection and degassing, followed by reflux treatment of molten steel. Excellent manufacturing method for steel pipes.
KR1019950048484A 1995-12-11 1995-12-11 The manufacturing method for pipe steelsheet with excellent anti hydrogen cracking property KR100256347B1 (en)

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Cited By (3)

* 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
KR100584748B1 (en) * 2001-12-22 2006-05-30 주식회사 포스코 Continuous Cast Steel Slab for Linepipe with Superior Hydrogen Induced Crack Resistance
WO2019125091A1 (en) 2017-12-24 2019-06-27 주식회사 포스코 High-strength steel having excellent low-yield-ratio characteristics, and manufacturing method therefor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100399231B1 (en) * 1998-12-14 2004-02-14 주식회사 포스코 Steel plate manufacturing method with excellent corrosion resistance fatigue resistance
KR101377791B1 (en) 2012-05-30 2014-03-25 현대제철 주식회사 Steel and method of manufacturing the same

Family Cites Families (1)

* 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

Cited By (5)

* 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
KR100584748B1 (en) * 2001-12-22 2006-05-30 주식회사 포스코 Continuous Cast Steel Slab for Linepipe with Superior Hydrogen Induced Crack Resistance
WO2019125091A1 (en) 2017-12-24 2019-06-27 주식회사 포스코 High-strength steel having excellent low-yield-ratio characteristics, and manufacturing method therefor
KR20190077184A (en) 2017-12-24 2019-07-03 주식회사 포스코 High strength steel sheet having excellent low yield ratio property, and manufacturing method for the same
US11519045B2 (en) 2017-12-24 2022-12-06 Posco High-strength steel having excellent low-yield-ratio characteristics, and manufacturing method therefor

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