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1. WO2020111705 - HIGH STRENGTH HOT ROLLED STEEL SHEET HAVING EXCELLENT ELONGATION AND METHOD FOR MANUFACTURING SAME

Publication Number WO/2020/111705
Publication Date 04.06.2020
International Application No. PCT/KR2019/016309
International Filing Date 26.11.2019
IPC
C22C 38/58 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
58with more than 1.5% by weight of manganese
C22C 38/42 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
42with copper
C22C 38/48 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
48with niobium or tantalum
C22C 38/50 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
50with titanium or zirconium
C22C 38/44 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
44with molybdenum or tungsten
C22C 38/02 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
02containing silicon
CPC
C21D 8/02
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
02during manufacturing of plates or strips
C22C 38/00
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
C22C 38/02
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
02containing silicon
C22C 38/06
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
06containing aluminium
C22C 38/42
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
42with copper
C22C 38/44
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
44with molybdenum or tungsten
Applicants
  • 주식회사 포스코 POSCO [KR]/[KR]
Inventors
  • 배진호 BAE, Jin-Ho
Agents
  • 특허법인 씨엔에스 C&S PATENT AND LAW OFFICE
Priority Data
10-2018-014687926.11.2018KR
Publication Language Korean (KO)
Filing Language Korean (KO)
Designated States
Title
(EN) HIGH STRENGTH HOT ROLLED STEEL SHEET HAVING EXCELLENT ELONGATION AND METHOD FOR MANUFACTURING SAME
(FR) TÔLE D'ACIER HAUTE RÉSISTANCE LAMINÉE À CHAUD AYANT UN EXCELLENT ALLONGEMENT ET SON PROCÉDÉ DE FABRICATION
(KO) 연신율이 우수한 고강도 열연강판 및 그 제조방법
Abstract
(EN)
An embodiment of the present invention provides a high strength hot rolled steel sheet having excellent elongation and a method for manufacturing same, the high strength hot rolled steel sheet containing, in weight percentage, 0.11-0.14% of C, 0.20-0.50% of Si, 1.8-2.0% of Mn, 0.03% of less of P, 0.02% or less of S, 0.01-0.04% of Nb, 0.5-0.8% of Cr, 0.01-0.03% of Ti, 0.2-0.4% of Cu, 0.1-0.4% of Ni, 0.2-0.4% of Mo, 0.007% or less of N, 0.001-0.006% of Ca, and 0.01-0.05% of Al, with the remainder comprising Fe and inevitable impurities, wherein relational expressions 1 to 3 below are satisfied, and the microstructure includes, by area percentage, 88% or more of bainite (excluding 100%), 10% or less of ferrite (excluding 0%), 2% or less of pearlite (excluding 0%), and 0.8% or less of island martensite (including 0%). [relational expression 1] 7 ≤ (Mo/93)/(P/31) ≤ 16, [relational expression 2] 1.6 ≤ Cr+3Mo+2Ni ≤ 2, [relational expression 3] 6 ≤ (3C/12+Mn/55)×100 ≤ 7 (in relational expressions 1 to 3, the contents of alloying elements are based on wt%)
(FR)
Selon un mode de réalisation, la présente invention concerne une tôle d'acier haute résistance laminée à chaud ayant un excellent allongement et son procédé de fabrication, la tôle d'acier laminée à chaud haute résistance contenant, en pourcentage en poids, de 0,11 à 0,14 % de C, de 0,20 à 0,50 % de Si, de 1,8 à 2,0 % de Mn, 0,03 % ou moins de P, 0,02 % ou moins de S, de 0,01 à 0,04 % de Nb, de 0,5 à 0,8 % de Cr, de 0,01 à 0,03 % de Ti, de 0,2 à 0,4 % de Cu, de 0,1 à 0,4 % de Ni, de 0,2 à 0,4 % de Mo, 0,007 % ou moins de N, de 0,001 à 0,006 % de Ca, et de 0,01 à 0,05 % d'Al, le reste comprenant du Fe et des impuretés inévitables, les expressions relationnelles 1 à 3 ci-dessous étant satisfaites, et la microstructure comprenant, par pourcentage de surface, 88 % ou plus de bainite (à l'exclusion de 100 %), 10 % ou moins de ferrite (à l'exclusion de 0 %), 2 % ou moins de perlite (à l'exclusion de 0 %), et 0,8 % ou moins de martensite d'îlot (y compris 0 %). [Expression relationnelle 1] 7 ≤ (Mo/93)/(P/31) ≤ 16, [expression relationnelle 2] 1,6 ≤ Cr + 3 Mo + 2 Ni ≤ 2, [expression relationnelle 3] 6 ≤ (3 C/12 + Mn/55) × 100 ≤ 7 (dans les expressions relationnelles 1 à 3, les teneurs en éléments d'alliage sont basées en % en poids)
(KO)
본 발명의 일 실시형태는 중량%로, C: 0.11~0.14%, Si: 0.20~0.50%, Mn: 1.8~2.0%, P: 0.03%이하, S: 0.02%이하, Nb: 0.01 ~ 0.04%, Cr: 0.5~0.8%, Ti: 0.01~0.03%, Cu: 0.2~0.4%, Ni: 0.1~0.4%, Mo: 0.2~0.4%, N: 0.007%이하, Ca: 0.001~0.006%, Al: 0.01~0.05%, 잔부 Fe 및 기타 불가피한 불순물을 포함하고, 하기 관계식 1 내지 3의 조건을 만족하며, 미세조직은 면적%로, 베이나이트: 88% 이상(100%는 제외), 페라이트: 10% 이하(0%는 제외), 펄라이트: 2% 이하(0%는 제외) 및 도상 마르텐사이트: 0.8% 이하(0%를 포함)를 포함하는 연신율이 우수한 고강도 열연강판 및 그 제조방법을 제공한다. [관계식 1] 7 ≤ (Mo/93)/(P/31) ≤ 16 [관계식 2] 1.6 ≤ Cr+3Mo+2Ni ≤ 2 [관계식 3] 6 ≤ (3C/12+Mn/55)×100 ≤ 7 (단, 상기 관계식 1 내지 3에 기재된 합금원소의 함량은 중량%임.)
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