KR950003458A - Manufacturing method of heat treatment type high strength hot rolled steel tube with excellent weldability - Google Patents

Manufacturing method of heat treatment type high strength hot rolled steel tube with excellent weldability Download PDF

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Publication number
KR950003458A
KR950003458A KR1019930014765A KR930014765A KR950003458A KR 950003458 A KR950003458 A KR 950003458A KR 1019930014765 A KR1019930014765 A KR 1019930014765A KR 930014765 A KR930014765 A KR 930014765A KR 950003458 A KR950003458 A KR 950003458A
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KR
South Korea
Prior art keywords
less
rolled steel
high strength
hot
heat treatment
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Application number
KR1019930014765A
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Korean (ko)
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KR950009217B1 (en
Inventor
박성호
Original Assignee
조말수
포항종합제철 주식회사
백덕현
재단법인 산업과학기술연구소
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Priority to KR1019930014765A priority Critical patent/KR950009217B1/en
Publication of KR950003458A publication Critical patent/KR950003458A/en
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Publication of KR950009217B1 publication Critical patent/KR950009217B1/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
    • 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
    • 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
    • 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
    • C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
    • C21D9/505—Cooling thereof
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese

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

Abstract

본 발명은 자동차문의 보강재 등에 사용되는 용접성이 우수한 열처리형 고강도 열간압연강관을 제조하는 방법에 관한 것으로서, 강성분 및 열간압연조건을 적절히 제어함으로써 열처리후 강도를 향상시킬 수 있고 확관능도 우수하여 사용중 변형을 받는 경우에도 용접부의 취성파괴현상을 최대한 억제할 수 있는 Al 첨가형 열연강관을 제공하고자 하는데, 그 목적이 있다.The present invention relates to a method for manufacturing a heat-treated high-strength hot-rolled steel tube having excellent weldability used in reinforcement materials of automobile doors, and by controlling the steel components and hot rolling conditions appropriately, the strength after heat treatment can be improved and the expansion capacity is excellent. It is an object of the present invention to provide an Al-added hot-rolled steel pipe that can suppress brittle fracture of welds even when subjected to deformation.

본 발명은 열처리형 고강도 강관을 제조하는 방법에 있어서, wt%로, C:0.12~0.19%, Si:0.5% 이하, Mn:1.0~2.0%, B:0.0010~0.0050%, Ti:0.5% 이하, 및 Al:0.02~0.25%를 기본성분으로 하고, 여기에 Cr:0.5% 이하 및 Nb:0.05% 이하 중에서 선택된 1종 또는 2종을 첨가하고, 잔부 Fe 및 기타 불가피한 불순물을 함유하여 조성되는 강을 850~900℃의 마무리 압연온도조건으로 열간압연한 후 수냉하여 630~690℃의 온도에서 권취하여 열간압연강판을 제조한 다음, 고주파용접에 의해 조관한 후, 연속열처리 설비를 사용하여 900~970℃의 온도로 가열후 급냉처리하는 것을 특징으로 하는 용접성이 우수한 열처리형 열간압연 고강도 강판을 제조하는 방법을 그 요지로 한다.The present invention is a method for producing a heat treatment type high strength steel pipe, in wt%, C: 0.12 ~ 0.19%, Si: 0.5% or less, Mn: 1.0 ~ 2.0%, B: 0.0010 ~ 0.0050%, Ti: 0.5% or less , And Al: 0.02-0.25% as a basic component, to which one or two selected from Cr: 0.5% or less and Nb: 0.05% or less are added, and the remainder is formed by containing Fe and other unavoidable impurities. After hot rolling at the finish rolling temperature condition of 850 ~ 900 ℃, the water was cooled and wound at a temperature of 630 ~ 690 ℃ to manufacture hot rolled steel sheet. The summary of the method is to produce a heat-treated hot rolled high strength steel sheet having excellent weldability, which is quenched after heating to a temperature of 970 ° C.

Description

용접성이 우수한 열처리형 고강도 열간압연강관의 제조방법Manufacturing method of heat treatment type high strength hot rolled steel tube with excellent weldability

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

제 1 도는 열간압연강관의 확관시험시 크랙발생과 확관형상을 나타내는 사진, 제 2 도는 열간압연강관의 굽힘시험중 변위-굽힘하중변화를 나타내는 그래프.1 is a photograph showing crack initiation and expansion shape during expansion test of hot rolled steel pipe, and FIG. 2 is a graph showing displacement-bending load change during bending test of hot rolled steel pipe.

Claims (1)

열처리형 고강도 강관을 제조하는 방법에 있어서, wt%로, C:0.12~0.19%, Si:0.5% 이하, Mn:1.0~2.0%, B:0.0010~0.0050%, Ti:0.5% 이하, 및 Al:0.02~0.25%를 기본성분으로 하고, 여기에 Cr:0.5% 이하 및 Nb:0.05% 이하 중에서 선택된 1종 또는 2종을 첨가하고, 잔부 Fe 및 기타 불가피한 불순물을 함유하여 조성되는 강을 850~900℃의 마무리 압연온도조건으로 열간압연한 후 수냉하여 630~690℃의 온도에서 권취하여 열간압연강판을 제조한 다음, 고주파용접에 의해 조관한 후, 연속열처리 설비를 사용하여 900~970℃의 온도로 가열후 급냉처리하는 것을 특징으로 하는 용접성이 우수한 열처리형 열간압연 고강도 강판의 제조방법.In the method for producing a heat-treated high strength steel pipe, in wt%, C: 0.12 to 0.19%, Si: 0.5% or less, Mn: 1.0 to 2.0%, B: 0.0010 to 0.0050%, Ti: 0.5% or less, and Al It is based on: 0.02 ~ 0.25% as the basic component, and adds one or two selected from Cr: 0.5% or less and Nb: 0.05% or less, and contains Fe and other unavoidable impurities. After hot rolling under the condition of finishing rolling temperature of 900 ° C, water-cooled and wound up at a temperature of 630 ~ 690 ° C to produce hot rolled steel sheet, and then the tube was welded by high frequency welding, followed by 900 ~ 970 ° C using a continuous heat treatment facility. A method for producing a heat-treated hot rolled high strength steel sheet having excellent weldability, characterized by quenching after heating to a temperature. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930014765A 1993-07-30 1993-07-30 Making method of high strength hot rolling steel pipe KR950009217B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019930014765A KR950009217B1 (en) 1993-07-30 1993-07-30 Making method of high strength hot rolling steel pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019930014765A KR950009217B1 (en) 1993-07-30 1993-07-30 Making method of high strength hot rolling steel pipe

Publications (2)

Publication Number Publication Date
KR950003458A true KR950003458A (en) 1995-02-16
KR950009217B1 KR950009217B1 (en) 1995-08-18

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Application Number Title Priority Date Filing Date
KR1019930014765A KR950009217B1 (en) 1993-07-30 1993-07-30 Making method of high strength hot rolling steel pipe

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KR950009217B1 (en) 1995-08-18

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