WO2022131592A1 - 내피로특성과 질화처리 특성이 향상된 스프링용 선재, 강선, 스프링 및 그 제조 방법 - Google Patents
내피로특성과 질화처리 특성이 향상된 스프링용 선재, 강선, 스프링 및 그 제조 방법 Download PDFInfo
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- WO2022131592A1 WO2022131592A1 PCT/KR2021/016990 KR2021016990W WO2022131592A1 WO 2022131592 A1 WO2022131592 A1 WO 2022131592A1 KR 2021016990 W KR2021016990 W KR 2021016990W WO 2022131592 A1 WO2022131592 A1 WO 2022131592A1
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- Prior art keywords
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- spring
- wire rod
- fatigue resistance
- steel wire
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 72
- 239000010959 steel Substances 0.000 title claims abstract description 72
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 36
- 229910001562 pearlite Inorganic materials 0.000 claims abstract description 33
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 30
- 239000012535 impurity Substances 0.000 claims abstract description 15
- 238000005121 nitriding Methods 0.000 claims description 68
- 238000010438 heat treatment Methods 0.000 claims description 45
- 238000001816 cooling Methods 0.000 claims description 20
- 230000009466 transformation Effects 0.000 claims description 20
- 238000005096 rolling process Methods 0.000 claims description 18
- 229910001566 austenite Inorganic materials 0.000 claims description 15
- 229910052720 vanadium Inorganic materials 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 14
- 239000002244 precipitate Substances 0.000 claims description 14
- 229910000734 martensite Inorganic materials 0.000 claims description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 229910052804 chromium Inorganic materials 0.000 claims description 11
- 229910052698 phosphorus Inorganic materials 0.000 claims description 11
- 229910052717 sulfur Inorganic materials 0.000 claims description 11
- 229910000639 Spring steel Inorganic materials 0.000 claims description 10
- 238000004804 winding Methods 0.000 claims description 6
- 238000005554 pickling Methods 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims 3
- 230000000052 comparative effect Effects 0.000 description 29
- 239000000463 material Substances 0.000 description 13
- 150000004767 nitrides Chemical class 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 150000001247 metal acetylides Chemical class 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 229910001563 bainite Inorganic materials 0.000 description 4
- 238000005261 decarburization Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- 238000005496 tempering Methods 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009661 fatigue test Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 235000019362 perlite Nutrition 0.000 description 2
- 239000010451 perlite Substances 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 238000005491 wire drawing Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000005480 shot peening Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000004627 transmission electron microscopy Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
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- F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
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Abstract
Description
구분 | 합금원소(중량%) | |||||||||
C | Si | Mn | Cr | P | S | Mo | V | Al | N | |
발명예1 | 0.63 | 2.2 | 0.3 | 1.2 | 0.009 | 0.005 | 0.2 | 0.15 | <0.003 | <0.005 |
발명예2 | 0.63 | 2.2 | 0.3 | 1.2 | 0.011 | 0.005 | 0.17 | 0.2 | <0.003 | <0.005 |
비교예1 | 0.63 | 2.2 | 0.4 | 1.2 | 0.009 | 0.004 | 0.24 | 0.11 | <0.003 | <0.005 |
비교예2 | 0.63 | 2.1 | 0.4 | 1.2 | 0.008 | 0.005 | 0.16 | 0.3 | <0.003 | <0.005 |
비교예3 | 0.62 | 2.1 | 0.3 | 1.2 | 0.01 | 0.004 | 0.3 | 0.2 | <0.003 | <0.005 |
비교예4 | 0.64 | 2.2 | 0.4 | 1.5 | 0.01 | 0.005 | 0.19 | 0.14 | <0.003 | <0.005 |
비교예5 | 0.62 | 2.2 | 0.3 | 1.1 | 0.008 | 0.005 | 0.12 | 0.03 | <0.003 | <0.005 |
구분 | 인장강도 (MPa) |
단면감소율 RA (%) |
펄라이트 분율 (%) |
구오스테나이트 평균 크기 (㎛) |
(V, Mo)C 석출물 개수 (개/10x10㎛2) |
VN 개수 (10mm당) |
발명예1 | 1212 | 41 | 92 | 20 | 13 | 0 |
발명예2 | 1156 | 42 | 91 | 22 | 15 | 0 |
비교예1 | 1455 | 11 | 42 | 21 | 13 | 0 |
비교예2 | 1253 | 35 | 88 | 19 | 48 | 0.2 |
비교예3 | 1642 | 3 | 0 | 22 | 22 | 0 |
비교예4 | 1532 | 3 | 0 | 23 | 15 | 0 |
비교예5 | 1241 | 41 | 95 | 21 | 4 | 0 |
Mo/V비 | Mn+Cr (중량%) |
LP열처리 펄라이트 변태시간 (sec) |
|
발명예1 | 1.33 | 1.5 | 110 |
발명예2 | 0.85 | 1.5 | 97 |
비교예1 | 2.18 | 1.6 | 171 |
비교예2 | 0.53 | 1.6 | 101 |
비교예3 | 1.50 | 1.5 | 180 |
비교예4 | 1.36 | 1.9 | 191 |
비교예5 | 4.00 | 1.4 | 88 |
QT강선 인장강도 (MPa) |
QT강선 RA (%) |
피로강도 (MPa) |
질화처리 후 1/4~3/4까지 평균 경도 (Hv) |
질화처리 후 피로강도 (MPa) |
|
발명예1 | 2242 | 44 | 812 | 612 | 901 |
발명예2 | 2232 | 45 | 808 | 605 | 898 |
비교예1 | 2232 | 42 | 811 | 603 | 878 |
비교예2 | 2322 | 38 | 712 | 622 | 902 |
비교예3 | 2352 | 35 | 802 | 612 | 903 |
비교예4 | 2251 | 44 | 803 | 605 | 898 |
비교예5 | 2152 | 46 | 793 | 580 | 791 |
Claims (15)
- 중량%로, C: 0.6 내지 0.7%, Si: 2.0 내지 2.5, Mn: 0.2 내지 0.5%, Cr: 0.9 내지 1.6%, P: 0.015% 이하, S: 0.01% 이하, Al: 0.01% 이하, N: 0.007% 이하, Mo: 0.1 내지 0.25, V: 0.1 내지 0.25%, 나머지 Fe 및 불가피한 불순물을 포함하고,Cr+Mn은 1.8% 이하이고,Mo/V는 1.5 이하이며,미세조직은 C단면에서 60% 이상의 펄라이트 조직을 포함하는 내피로특성과 질화처리 특성이 향상된 스프링용 선재.
- 제1항에 있어서,구오스테나이트 평균 결정립 크기가 25㎛ 이하인 내피로특성과 질화처리 특성이 향상된 스프링용 선재.
- 제1항에 있어서,100mm L단면 분석시 길이로 10mm당, 표면 깊이 1mm에서 평균 입경이 10㎛ 이상인 VN 석출물의 개수가 0.2개 미만인 내피로특성과 질화처리 특성이 향상된 스프링용 선재.
- 제1항에 있어서,탄화물 내 Mo+V 함량이 10at.% 이상이고,평균 입경이 50nm 이하이고,10개 이상/10x10μm2으로 분포하는 (V, Mo)C 탄화물을 포함하는 내피로특성과 질화처리 특성이 향상된 스프링용 선재.
- 제1항에 있어서,인장강도는 1,400 MPa 이하이고, 단면감소율은 40% 이상인 내피로특성과 질화처리 특성이 향상된 스프링용 선재.
- 중량%로, C: 0.6 내지 0.7%, Si: 2.0 내지 2.5, Mn: 0.2 내지 0.5%, Cr: 0.9 내지 1.6%, P: 0.015% 이하, S: 0.01% 이하, Al: 0.01% 이하, N: 0.007% 이하, Mo: 0.1 내지 0.25, V: 0.1 내지 0.25% 나머지 Fe 및 불가피한 불순물을 포함하고, Cr+Mn은 1.8% 이하이고, Mo/V는 1.5 이하인 블룸(bloom)을 1,200℃이상의 온도로 가열한 후 빌렛으로 압연하는 단계;상기 빌렛을 1,050℃이상의 온도에서 180분 동안 유지하는 단계;상기 빌렛을 1,000℃이하에서 압연하여 선재를 얻는 단계;상기 압연된 선재를 900℃이하의 온도에서 권취하는 단계; 및귄취된 선재를 2℃/sec이하의 냉각 속도로 냉각하는 단계;를 포함하는 내피로특성과 질화처리 특성이 향상된 스프링용 선재 제조방법.
- 제1항 내지 5항 중 어느 한 항의 스프링용 선재를 900 내지 1050℃의 온도로 가열하고, 650 내지 750℃로 급냉하여 항온 변태하는 단계; 및상기 선재를 신선하여 강선을 제조하는 단계;를 포함하는 내피로특성과 질화처리 특성이 향상된 스프링용 강선 제조방법.
- 제7항에 있어서,상기 항온 변태하는 단계 전에 상기 선재를 650 내지 750℃로 가열하는 단계; 및상기 가열된 선재를 산세하는 단계;를 더 포함하는 내피로특성과 질화처리 특성이 향상된 스프링용 강선 제조방법.
- 제 7항에 있어서,항온 변태 시간은,150초 이내인 내피로특성과 질화처리 특성이 향상된 스프링용 강선 제조방법.
- 제 7항에 있어서,상기 강선을 QT열처리하는 단계;를 더 포함하는 내피로특성과 질화처리 특성이 향상된 스프링용 강선 제조방법.
- 중량%로, C: 0.6 내지 0.7%, Si: 2.0 내지 2.5, Mn: 0.2 내지 0.5%, Cr: 0.9 내지 1.6%, P: 0.015% 이하, S: 0.01% 이하, Al: 0.01% 이하, N: 0.007% 이하, Mo: 0.1 내지 0.25, V: 0.1 내지 0.25% 나머지 Fe 및 불가피한 불순물을 포함하고, Cr+Mn은 1.8% 이하이고, Mo/V는 1.5 이하이며,미세조직으로, 템퍼드 마르텐사이트를 90% 이상을 포함하는 내피로특성과 질화처리 특성이 향상된 스프링용 강선.
- 제11항에 있어서,구오스테나이트 평균 결정립 크기는 25㎛ 이하인 내피로특성과 질화처리 특성이 향상된 스프링용 강선.
- 제11항에 있어서,100mm L단면 분석시 길이로 10mm당, 표면 깊이 1mm에서 평균 입경이 10㎛ 이상인 VN 석출물의 개수가 0.2개 미만인 내피로특성과 질화처리 특성이 향상된 스프링용 강선.
- 제11항에 있어서,인장강도는 2,100 MPa 이상이고, 단면감소율은 40% 이상인 내피로특성과 질화처리 특성이 향상된 스프링용 강선.
- 제11항에 있어서,탄화물 내 Mo+V 함량이 10at.% 이상이고,평균 입경이 50nm 이하이고,10개 이상/10x10μm2으로 분포하는 (V, Mo)C 탄화물을 포함하는 내피로특성과 질화처리 특성이 향상된 스프링용 강선.
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JP2004315968A (ja) * | 2003-03-28 | 2004-11-11 | Kobe Steel Ltd | 加工性に優れた高強度ばね用鋼線および高強度ばね |
US20090283181A1 (en) * | 2002-04-02 | 2009-11-19 | Kabushiki Kaisha Kobe Seiko Sho | Steel wire for hard drawn spring excellent in fatigue strength and resistance to settling, and hard drawn spring |
KR101096888B1 (ko) * | 2004-02-04 | 2011-12-22 | 스미토모 덴코 스틸 와이어 가부시키가이샤 | 스프링용 강선 |
KR20120040728A (ko) * | 2010-07-06 | 2012-04-27 | 신닛뽄세이테쯔 카부시키카이샤 | 고강도 스프링용 와이어 드로잉 열처리 강선, 및 고강도 스프링용 와이어 드로잉 전 강선 |
KR20180019212A (ko) * | 2015-07-27 | 2018-02-23 | 신닛테츠스미킨 카부시키카이샤 | 현가 스프링용 강 및 그의 제조 방법 |
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US20090283181A1 (en) * | 2002-04-02 | 2009-11-19 | Kabushiki Kaisha Kobe Seiko Sho | Steel wire for hard drawn spring excellent in fatigue strength and resistance to settling, and hard drawn spring |
JP2004315968A (ja) * | 2003-03-28 | 2004-11-11 | Kobe Steel Ltd | 加工性に優れた高強度ばね用鋼線および高強度ばね |
KR101096888B1 (ko) * | 2004-02-04 | 2011-12-22 | 스미토모 덴코 스틸 와이어 가부시키가이샤 | 스프링용 강선 |
KR20120040728A (ko) * | 2010-07-06 | 2012-04-27 | 신닛뽄세이테쯔 카부시키카이샤 | 고강도 스프링용 와이어 드로잉 열처리 강선, 및 고강도 스프링용 와이어 드로잉 전 강선 |
KR20180019212A (ko) * | 2015-07-27 | 2018-02-23 | 신닛테츠스미킨 카부시키카이샤 | 현가 스프링용 강 및 그의 제조 방법 |
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