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1. (WO2019066328) WIRE ROD AND STEEL WIRE FOR SPRINGS HAVING EXCELLENT CORROSION FATIGUE RESISTANCE PROPERTIES, AND METHOD FOR PRODUCING SAME
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Pub. No.: WO/2019/066328 International Application No.: PCT/KR2018/010764
Publication Date: 04.04.2019 International Filing Date: 13.09.2018
IPC:
C22C 38/24 (2006.01) ,C22C 38/02 (2006.01) ,C22C 38/04 (2006.01) ,C22C 38/34 (2006.01) ,C22C 38/26 (2006.01) ,C21D 3/04 (2006.01) ,C21D 8/06 (2006.01) ,C21D 9/52 (2006.01)
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
18
containing chromium
24
with vanadium
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
02
containing silicon
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
04
containing manganese
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
18
containing chromium
34
with more than 1.5% by weight of silicon
C CHEMISTRY; METALLURGY
22
METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
C
ALLOYS
38
Ferrous alloys, e.g. steel alloys
18
containing chromium
26
with niobium or tantalum
C CHEMISTRY; METALLURGY
21
METALLURGY OF IRON
D
MODIFYING 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
3
Diffusion processes for extraction of non-metals; Furnaces therefor
02
Extraction of non-metals
04
Decarburising
C CHEMISTRY; METALLURGY
21
METALLURGY OF IRON
D
MODIFYING 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
8
Modifying the physical properties by deformation combined with, or followed by, heat treatment
06
during manufacturing of rods or wires
C CHEMISTRY; METALLURGY
21
METALLURGY OF IRON
D
MODIFYING 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
9
Heat treatment, e.g. annealing, hardening, quenching, tempering, adapted for particular articles; Furnaces therefor
52
for wires; for strips
Applicants:
주식회사 포스코 POSCO [KR/KR]; 경상북도 포항시 남구 동해안로 6261 (괴동동) (Goedong-dong) 6261, Donghaean-ro, Nam-gu Pohang-si, Gyeongsangbuk-do 37859, KR
Inventors:
김관호 KIM, Kwan-Ho; KR
Agent:
특허법인 씨엔에스 C&S PATENT AND LAW OFFICE; 서울시 강남구 언주로30길 13, 대림아크로텔 7층 7th Floor, Daelim Acrotel 13, Eonju-ro 30-gil Gangnam-gu, Seoul 06292, KR
Priority Data:
10-2017-012726329.09.2017KR
Title (EN) WIRE ROD AND STEEL WIRE FOR SPRINGS HAVING EXCELLENT CORROSION FATIGUE RESISTANCE PROPERTIES, AND METHOD FOR PRODUCING SAME
(FR) FIL MACHINE ET FIL D'ACIER POUR RESSORTS AYANT D'EXCELLENTES PROPRIÉTÉS DE RÉSISTANCE À LA FATIGUE À LA CORROSION, ET LEUR PROCÉDÉ DE PRODUCTION
(KO) 내부식 피로특성이 우수한 스프링용 선재, 강선 및 이들의 제조방법
Abstract:
(EN) The present invention relates to a wire rod and a steel wire which are for springs and have excellent corrosion fatigue resistance properties, and a method for producing same, and more particularly, to a wire rod and a steel wire which are for springs and have excellent corrosion fatigue resistance properties, and a method for producing same, wherein the wire rod and steel wire can be applied to vehicle suspensions springs, torsion bars, and stabilizers. An embodiment of the present invention provides a wire rod and a steel wire which are for springs and have excellent corrosion fatigue resistance properties, and a method for producing same, the wire rod and steel wire containing, in wt%, 0.40-0.70% of C, 1.20-2.30% of Si, 0.20-0.80% of Mn, 0.20-0.80% of Cr, 0.015% or less of P, 0.015% or less of S, and 0.010% or less of N, with the remainder comprising Fe and other unavoidable impurities, along with at least one among 0.01-0.20% of V and 0.01-0.10% of Nb, wherein the V and Nb satisfy relational expression 1 below, the average grain size of spherical austenite is no greater than 20 µm, and the surface decarburization depth is no greater than 0.1 mm. [Relational expression 1] [V]+[Nb] ≥ 0.08 (where the V and Nb contents are in wt%)
(FR) La présente invention concerne un fil machine et un fil d'acier qui sont destinés à des ressorts et ont d'excellentes propriétés de résistance à la fatigue à la corrosion, et leur procédé de production, et plus particulièrement, un fil machine et un fil d'acier qui sont destinés à des ressorts et ont d'excellentes propriétés de résistance à la fatigue à la corrosion, et un procédé de production de ceux-ci, le fil machine et le fil d'acier pouvant être appliqués à des ressorts de suspension de véhicule, des barres de torsion et des stabilisateurs. Un mode de réalisation de la présente invention concerne un fil machine et un fil d'acier qui sont destinés pour des ressorts et ont d'excellentes propriétés de résistance à la fatigue à la corrosion, et un procédé de production de ceux-ci, le fil machine et le fil d'acier contenant, en % en poids, 0,40 à 0,70 % de C, 1,20 à 2,30 % de Si, 0,20 à 0,80 % de Mn, 0,20 à 0,80 % de Cr, 0 015 % ou moins de P, 0 015 % ou moins de S, et 0 010 % ou moins de N, le reste comprenant du Fe et d'autres impuretés inévitables, ainsi qu'au moins l'un parmi 0,01 à 0,20 % de V et 0,01 à 0,10 % de Nb, le V et le Nb satisfaisant l'expression relationnelle 1 ci-dessous, la taille moyenne des grains d'austénite sphérique n'étant pas supérieure à 20 µm, et la profondeur de décarburation superficielle n'étant pas supérieure à 0,1 mm. [Expression relationnelle 1] [V] + [Nb] ≥ 0,08 (où les teneurs en V et Nb sont en % en poids)
(KO) 본 발명은 내부식 피로특성이 우수한 스프링용 선재, 강선 및 이들의 제조방법에 관한 것으로서, 보다 상세하게는 자동차용 현가 스프링, 토션 바, 스태빌라이저 등에 적용 가능한 내부식 피로특성이 우수한 스프링용 선재, 강선 및 이들의 제조방법에 관한 것이다. 본 발명의 일 실시형태는 중량%로, C: 0.40~0.70%, Si: 1.20~2.30%, Mn: 0.20~0.80%, Cr: 0.20~0.80%, P: 0.015% 이하, S: 0.015% 이하, N: 0.010% 이하, 잔부 Fe 및 기타 불가피한 불순물을 포함하고, 추가로, V: 0.01~0.20% 및 Nb: 0.01~0.10% 중 1종 또는 2종을 포함하며, 상기 V 및 Nb는 하기 관계식 1을 만족하고, 구오스테나이트의 평균 결정립 크기는 20㎛ 이하이며, 표면 탈탄 깊이는 0.1mm 이하인 내부식 피로특성이 우수한 스프링용 선재, 강선 및 이들의 제조방법을 제공한다. [관계식 1] [V]+[Nb] ≥ 0.08 (단, 상기 V 및 Nb의 함량은 중량%를 의미함.)
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African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (EPO) (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: Korean (KO)
Filing Language: Korean (KO)