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1. WO2020133853 - B444M2 FERRITIC STAINLESS STEEL WITH IMPROVED HIGH-TEMPERATURE OXIDATION RESISTANCE AND PREPARATION METHOD THEREFOR

Publication Number WO/2020/133853
Publication Date 02.07.2020
International Application No. PCT/CN2019/084874
International Filing Date 29.04.2019
IPC
C21D 1/26 2006.1
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
1General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
26Methods of annealing
C21D 8/02 2006.1
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 2006.1
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 2006.1
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 38/04 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
04containing manganese
C22C 38/22 2006.1
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
22with molybdenum or tungsten
CPC
C21D 1/26
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, e.g. BY DECARBURISATION OR TEMPERING
1General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
26Methods of annealing
C21D 2211/005
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, e.g. BY DECARBURISATION OR TEMPERING
2211Microstructure comprising significant phases
005Ferrite
C21D 8/0226
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, e.g. BY DECARBURISATION OR TEMPERING
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
02during manufacturing of plates or strips
0221characterised by the working steps
0226Hot rolling
C21D 8/0236
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, e.g. BY DECARBURISATION OR TEMPERING
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
02during manufacturing of plates or strips
0221characterised by the working steps
0236Cold rolling
C22C 38/001
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
001containing N
C22C 38/002
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
002containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
Applicants
  • 东北大学 NORTHEASTERN UNIVERSITY [CN]/[CN]
Inventors
  • 陈礼清 CHEN, Liqing
  • 魏亮亮 WEI, Liangliang
  • 韩力强 HAN, Liqiang
  • 刘后龙 LIU, Houlong
  • 马明玉 MA, Mingyu
  • 刘玲玲 LIU, Lingling
  • 习小慧 XI, Xiaohui
Agents
  • 沈阳东大知识产权代理有限公司 SHENYANG DONGDA INTELLECTUAL PROPERTY AGENCY CO.,LTD
Priority Data
201811579140.324.12.2018CN
Publication Language Chinese (ZH)
Filing Language Chinese (ZH)
Designated States
Title
(EN) B444M2 FERRITIC STAINLESS STEEL WITH IMPROVED HIGH-TEMPERATURE OXIDATION RESISTANCE AND PREPARATION METHOD THEREFOR
(FR) ACIER FERRITIQUE DE TYPE B444M2 AYANT UNE RÉSISTANCE AMÉLIORÉE À L'OXYDATION À HAUTE TEMPÉRATURE ET SON PROCÉDÉ DE PRÉPARATION
(ZH) 提高高温抗氧化性能的B444M2型铁素体不锈钢及其制备方法
Abstract
(EN)
The present invention relates to the technical field of metallurgical materials, and specifically relates to a B444M2 ferritic stainless steel with improved high-temperature oxidation resistance, and a preparation method therefor. The chemical components of the ferritic stainless steel comprise the following (in weight percentage): C 0-0.01%; Si 0.4-0.6%; Mn 0.25-0.35%; S 0-0.009%; P 0-0.01%; Cr 19-20%; Nb 0.4-0.5%; Ti 0.1-0.2%; N 0-0.01%; Mo 1.9-2.1%; W 0.4-0.6%; and Ce 0.04~0.1%; the remainder is Fe. The micro-structure of the ferritic stainless steel is ferrite, and precipitates of a size of 200-400 nm are dispersed in the grain boundaries and in the crystals. Smelting molten steel according to the set composition, casting into a casting blank, and forging after high-temperature homogenisation treatment; re-heating the casting blanks to 1200℃ ±15℃ and maintaining the temperature and, after rolling 6-8 times, acquiring hot-rolled sheet; annealing the hot-rolled sheet and removing the surface iron oxide scale, and then implementing cold rolling to acquire cold-rolled sheet; and keeping the cold-rolled plate at 1020℃ ±15℃ for 1.5-2.5 min for annealing. Thus, a ferritic stainless steel material with excellent high-temperature oxidation resistance and good formability is obtained.
(FR)
La présente invention concerne le domaine technique des matériaux métallurgiques, et concerne plus particulièrement un acier ferritique de type B444M2 ayant une résistance améliorée à l'oxydation à haute température, ainsi que son procédé de préparation. Les constituants chimiques de l'acier ferritique comprennent les éléments suivants (en pourcentage en poids) : de 0 à 0,01 % de C ; de 0,4 à 0,6 % de Si ; de 0,25 à 0,35 % de Mn ; de 0 à 0,009 % de S ; de 0 à 0,01 % de P ; de 19 à 20 % de Cr ; de 0,4 à 0,5 % de Nb ; de 0,1 à 0,2 % de Ti ; de 0 à 0,01 % de N ; de 1,9 à 2,1 % de Mo ; de 0,4 à 0,6 % de W ; et de 0,04 à environ 0,1 % de Ce ; le reste étant du Fe. La microstructure de l'acier inoxydable ferritique est de la ferrite, et des précipités d'une taille de 200 à 400 nm sont dispersés dans les joints de grain et dans les cristaux. L'invention consiste à faire fondre de l'acier fondu selon la composition définie, réaliser un coulage sous la forme d'une ébauche de coulée, et réaliser un forgeage après un traitement d'homogénéisation à haute température ; réchauffer les ébauches de coulée jusqu'à 1 200 °C ± 15 °C et maintenir la température et, après 6 à 8 laminages, obtenir une feuille laminée à chaud ; recuire la feuille laminée à chaud et retirer la calamine d'oxyde de fer en surface, puis mettre en œuvre un laminage à froid pour obtenir une feuille laminée à froid ; et maintenir la plaque laminée à froid à 1 020 °C ± 15 °C pendant 1,5 à 2,5 min pour le recuit. On obtient ainsi un matériau d'acier inoxydable ferritique ayant une excellente résistance à l'oxydation à haute température et une bonne aptitude au formage.
(ZH)
本发明属于冶金材料技术领域,特别涉及一种提高高温抗氧化性能的B444M2型铁素体不锈钢的成分设计及其制备方法。铁素体不锈钢化学成分(按重量百分比)为:C 0~0.01%;Si 0.4~0.6%;Mn 0.25~0.35%;S 0~0.009%; P 0~0.01%;Cr 19~20%;Nb 0.4~0.5%;Ti 0.1~0.2%;N 0~0.01%;Mo 1.9~2.1%;W 0.4~0.6%;Ce 0.04~0.1%;余量为Fe。铁素体不锈钢的显微组织为铁素体,且在晶界及晶内弥散分布着尺寸为200~400nm的析出物。按设定成分冶炼钢水并铸成铸坯,经高温均匀化处理后即实施锻造;将锻造坯重新加热至1200℃±15℃保温,随后经6~8道次轧制后获得热轧板;热轧板经退火及除去表面氧化铁皮后进行冷轧获得冷轧板;冷轧板在1020℃±15℃保温1.5~2.5min退火。此时,可以获得成形性能良好且具有优异高温抗氧化性能的铁素体不锈钢材料。
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