Heat treatment process of high-strength and high-toughness bainite-martensite complex-phase bainite steel rail
A high-strength toughness, phase bainite technology, applied in the direction of heat treatment furnace, heat treatment equipment, heat treatment process control, etc., can solve the problems of structure coarsening, improvement, poor performance, etc., achieve high rolling contact fatigue performance, reduce the distance between tissue sheets , High resistance to peeling off block effect
Active Publication Date: 2021-09-21
BAOTOU IRON & STEEL GRP
View PDF19 Cites 7 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] Beijing Teye Industry and Trade Co., Ltd. proposed "bainite steel and bainite rail for curved and heavy-duty rails and its production method" (publication number is CN101921971A), but due to the use of air cooling, the cooling rate is 10 to 20 °C/min cooling, the strength of the obtained rail is low, only 1200-1300MPa, which cannot meet the growing heavy-duty railway construction
Anshan Iron and Steel Co., Ltd. proposed "a steel rail with a bainite structure with excellent fatigue resistance and its production method" (public number CN1978690A), but the use of "natural cooling in the air after hot rolling" will inevitably cause seasonal changes Effect on cooling rate, resulting in inhomogeneous performance and structure
The General Institute of Iron and Steel Research proposed "A heat treatment method for an alloy system and its bainite rail" (publication number is CN105385938A), but due to
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0028] The steel rail of the present invention uses C, Mn, Si, Cr, Ni, Mo as the main alloying elements, and adds microalloying elements such as Nb and V, and the weight percentage of the chemical composition of the steel rail is C: 0.15-0.30%, Si: 0.60-1.40% , Mn: 1.60-2.60%, Cr: 0.45-1.30%, Ni: 0.20-0.70%, Mo: 0.20-0.60%, V: 0-0.20%, Nb: 0-0.06%, P≤0.022%, S≤ 0.015%, Al: ≤0.010%, the rest is Fe. The blanks with the above components are smelted, continuously cast, and billets are slowly cooled. After smelting, the steel slab is subjected to continuous casting slab slow cooling in the range of 600-900 ° C in time, and the slow cooling time is more than 60 hours, so as to further reduce the hydrogen content in the slab.
[0029] 2) The steel billet is reciprocally rolled by BD1, BD2, and CCS, and the rolling compression ratio should not be less than 9:1 to ensure the grain size of the original austenite of the rail; the rail should be descaled by multi-stage high-pressure spra...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more PUM
Login to view more Abstract
The invention discloses a heat treatment process of a high-strength and high-toughness bainite-martensite complex-phase bainite steel rail The heat treatment process is characterized in that the cooling speed of the steel rail at different temperature stages is controlled to avoid poor-performance tissues such as upper bainite and granular bainite so as to form a lower bainite and low-carbon martensite complex-phase tissue, so that tissue segregation (martensite segregation zone) can be effectively improved, original austenite grains can be refined, the spacing of tissue pieces is reduced, and the number of residual austenite is reduced, so that the steel rail has the characteristics of high strength, high plasticity, high toughness, high stripping and chipping resistance, high wear resistance, high rolling contact fatigue performance and the like.
Description
technical field [0001] The invention relates to a heat treatment process for a high-strength toughness Bema complex-phase bainite steel rail. Background technique [0002] With the advancement of railway heavy-duty transportation technology, my country's railway heavy-duty transportation capacity is continuously improving, and the axle load of heavy-duty trucks is gradually increasing. Heavy-duty railways have the characteristics of heavy axles, large transportation volume, and high departure density. The circulation volume of the Daqin Line reaches 500 million tons per year. The rapid development of steel rails for heavy-duty railways has put forward more stringent requirements for the strength, toughness, wear resistance and fatigue resistance of steel rail materials. The pearlitic steel rails commonly used at present, due to the characteristics of its composition and structure, its strength and toughness are basically exerted to the limit, and its impact toughness and fra...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more Application Information
Patent Timeline
Login to view more IPC IPC(8): C21D1/18C21D6/00C21D8/00C21D9/04C21D11/00C22C38/02C22C38/06C22C38/44C22C38/46C22C38/48C22C38/58
CPCC21D9/04C21D11/005C21D8/005C21D6/004C21D6/005C21D6/008C21D1/18C22C38/02C22C38/58C22C38/44C22C38/46C22C38/48C22C38/06C21D2211/002C21D2211/008Y02P10/20
Inventor 张凤明何建中梁正伟李智丽
Owner BAOTOU IRON & STEEL GRP
Who we serve
- R&D Engineer
- R&D Manager
- IP Professional
Why Eureka
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Social media
Try Eureka
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap