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1. (WO2018103079) HEAT TREATMENT PROCESS FOR INCREASING RESILIENCE OF BEARING STEEL
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Pub. No.: WO/2018/103079 International Application No.: PCT/CN2016/109248
Publication Date: 14.06.2018 International Filing Date: 09.12.2016
IPC:
C21D 1/00 (2006.01) ,C21D 1/18 (2006.01) ,C21D 1/26 (2006.01) ,C21D 1/28 (2006.01) ,C21D 1/58 (2006.01) ,C21D 6/04 (2006.01) ,C21D 9/00 (2006.01)
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
1
General methods or devices for heat treatment, e.g. annealing, hardening, quenching, tempering
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
1
General methods or devices for heat treatment, e.g. annealing, hardening, quenching, tempering
18
Hardening; Quenching with or without subsequent tempering
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
1
General methods or devices for heat treatment, e.g. annealing, hardening, quenching, tempering
26
Methods of annealing
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
1
General methods or devices for heat treatment, e.g. annealing, hardening, quenching, tempering
26
Methods of annealing
28
Normalising
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
1
General methods or devices for heat treatment, e.g. annealing, hardening, quenching, tempering
56
characterised by the quenching agents
58
Oils
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
6
Heat treatment of ferrous alloys
04
Hardening by cooling below 0 C
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
Applicants:
机械科学研究总院青岛分院有限公司 QINGDAO BRANCH CO., LTD. OF MECHANICAL SCIENCE RESEARCH INSTITUTE [CN/CN]; 中国山东省青岛市 胶州市经济技术开发区汇英街南首单虎 SHAN, Hu South First of Huiying Street, Economic and Technological Development Zone, Jiaozhou Qingdao, Shandong 266300, CN
Inventors:
张康 ZHANG, Kang; CN
叶永 YE, Yong; CN
Agent:
青岛致嘉知识产权代理事务所(普通合伙) QINGDAO ZHIJIA INTELLECTUAL PROPERTY AGENCY FIRM (GENERAL PARTNERSHIP ); 中国山东省青岛市 李沧区万年泉路237号中海国际社区1501室单虎 SHAN, Hu Room 1501, Zhonghaiguoji Square, No.237, Wannianquan Qingdao, Shandong 266000, CN
Priority Data:
Title (EN) HEAT TREATMENT PROCESS FOR INCREASING RESILIENCE OF BEARING STEEL
(FR) PROCÉDÉ DE TRAITEMENT THERMIQUE PERMETTANT D'AUGMENTER LA RÉSISTANCE D'UN ACIER POUR ROULEMENTS
(ZH) 一种提高轴承钢韧性的热处理工艺
Abstract:
(EN) A heat treatment process for increasing the resilience of a bearing steel, comprising the following steps: S1 annealing: a steel material is kept warm at 880-1000 °C for 4-6 h, with the temperature being cooled at a rate of 25-45 °C/h to 800-860 °C, kept warm for 1-2h, then with the temperature being cooled at a rate of 20-30 °C/h to 600-700 °C, kept warm for 1-2 h, and then removed from a furnace for air cooling; S2, normalization: the temperature in the furnace is raised to 750-820 °C, the steel material is placed therein, kept warm for 2-4 h, and removed from the furnace for air cooling; S3, quenching: under the protection of nitrogen gas, the steel material is kept warm at a temperature of 1000-1100 °C for 1-2 h, then rapidly quenched into an oil of 100-220 °C for cooling, thus allowing a carbide to be evenly distributed, and the steel material is removed when the temperature thereof drops to 150-180 °C and then air cooled; S4, primary freeze treatment: the steel material of S3 is cold treated at a temperature of −73 °C for 1-2 h; and S5, primary tempering: placing the steel material into a tempering furnace and, with the tempering furnace being heated to 150-170 °C, kept warm for 1-3 h. The bearing steel prepared per the process is of increased purity and has a reduced amount of impurities, fine and diffused carbides, a uniform size, and significantly increased resilience.
(FR) L'invention concerne un procédé de traitement thermique permettant d'augmenter la résistance d'un acier pour roulements, comprenant les étapes suivantes : S1 recuisson : un matériau en acier est maintenu chaud à 880-1 000 °C pendant 4-6 h, puis la température est abaissée au rythme de 25-45 °C/h jusqu'à 800-860 °C et le matériau en acier est maintenu chaud pendant 1-2 h, puis la température est abaissée au rythme de 20-30 °C/h jusqu'à 600-700 °C et le matériau en acier est maintenu chaud pendant 1-2 h, avant d'être retiré du four pour être refroidi à l'air ; S2 normalisation : la température dans le four est augmentée jusqu'à 750-820 °C, le matériau en acier est placé à l'intérieur de celui-ci, maintenu chaud pendant 2-4 h et retiré du four pour être refroidi à l'air ; S3 trempe : sous une protection d'azote gazeux, le matériau en acier est maintenu chaud à une température de 1 000-1 100 °C pendant 1-2 h, puis trempé rapidement dans une huile à 100-220 °C pour être refroidi, avec pour résultat une répartition uniforme du carbure, puis le matériau en acier en est retiré lorsque sa température chute à 150-180 °C, pour être refroidi à l'air ; S4 traitement de congélation primaire : le matériau en acier du S3 est traité à froid à une température de -73 °C pendant 1-2 h ; et S5 tempérage primaire : le matériau en acier est placé dans un four de tempérage et, le four de tempérage étant chauffé à 150-170 °C, maintenu chaud pendant 1-3 h. L'acier pour roulements préparé par le procédé est d'une plus grande pureté et présente une quantité réduite d'impuretés, de fines et de carbures diffusés, une taille uniforme et une résistance significativement accrue.
(ZH) 一种提高轴承钢韧性的热处理工艺,包括以下步骤:S1,退火:钢材在880-1000℃保温4-6h,将温度以25-45℃/h的速度冷至800-860℃,保温1-2h,再将温度以20-30℃/h的速度冷至600-700℃,保温1-2h后出炉空冷;S2,正火:将炉内的温度升至750-820℃,放入钢材,保温2-4h,出炉空冷;S3,淬火:在氮气保护下,钢材在1000-1100℃温度下保温1-2h后,迅速淬入100-220℃的油中冷却,使得碳化物分布均匀,待钢材温度降至150-180℃时取出,随后空冷;S4,一次冷冻处理:将S3的钢材在-73℃温度下冷处理1-2h;S5,一次回火:将钢材放入回火炉,将回火炉升温至150-170℃,保温1-3h。该工艺制备的轴承钢纯净度更高,夹杂物数量少,碳化物细小而弥散,且尺寸均匀,韧性得到显著提高
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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: Chinese (ZH)
Filing Language: Chinese (ZH)