Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Nb and B microalloyed gear steel, preparation method, heat treatment method and carburizing treatment method thereof and carburized gear steel

A heat treatment method and microalloying technology, applied in the field of gear steel, can solve the problems of materials that cannot adapt to high contact fatigue performance

Active Publication Date: 2021-09-21
MAANSHAN IRON & STEEL CO LTD
View PDF9 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its rated contact fatigue is only 2.0×10 7 Left and right, with the gradual increase in the performance requirements of high-performance gear steel in high-speed rail, wind power and other industries, it can no longer meet the current demand for materials with high contact fatigue performance, so it is necessary to develop carburized gear steel with better performance

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Nb and B microalloyed gear steel, preparation method, heat treatment method and carburizing treatment method thereof and carburized gear steel
  • Nb and B microalloyed gear steel, preparation method, heat treatment method and carburizing treatment method thereof and carburized gear steel
  • Nb and B microalloyed gear steel, preparation method, heat treatment method and carburizing treatment method thereof and carburized gear steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0072] A kind of Nb, B micro-alloyed gear steel, comprising the following chemical composition in weight percentage: C: 0.15-0.19%, Si: 0.15-0.30%, Mn: 0.60-0.90%, Cr: 1.60-1.80%, Mo: 0.20 ~0.35%, Nb: 0.025~0.040%, Ni: 1.50~1.70%, Al: 0.020~0.040%, P: ≤0.010%, S: ≤0.010%, B: 0.0005~0.0020%; T.O: ≤10ppm, [ H]: ≤1.0ppm, [N]: 80-120ppm, Al / [N]: 2.5~5.0, the rest are Fe and unavoidable impurity elements, among them, Km=C+Mn / 6+(Cr+Mo+ V) / 5+(Ni+Cu) / 15+10Nb+100[1+1.5(0.9-C)]×B, and Km: 0.97-1.37.

[0073] It adopts the process of electric arc furnace smelting-LF refining-RH vacuum treatment-continuous casting-hot rolling-slow cooling, as follows:

[0074] The continuous casting slab is heated and kept at 1230-1280°C for ≥5 hours before round steel rolling. The rolling start temperature is 1120-1180°C and the final rolling temperature is 930-980°C. After rolling, it is cooled by a cooling bed to ≤650°C and slowly cooled , the slow cooling time is 48 hours, and the skin is ground and p...

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

PropertyMeasurementUnit
tensile strengthaaaaaaaaaa
yield strengthaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses Nb and B microalloyed gear steel, a preparation method, a heat treatment method and a carburizing treatment method thereof and carburized gear steel. Nb and B microalloying is adopted, and the Nb and B microalloyed gear steel with a ferrite and pearlite structure is obtained; the production process of electric arc furnace smelting, LF refining, RH vacuum treatment, continuous casting, hot rolling and slow cooling is adopted; after the gear steel subjected to hot rolling and slow cooling is subjected to heat treatment, the Nb and B microalloyed gear steel with the tensile strength larger than or equal to 1450 MPa, the yield strength larger than or equal to 1340 MPa, the ductility larger than or equal to 14%, the percentage reduction of area larger than or equal to 50% and the impact energy KV2 larger than or equal to 95J is obtained; and the gear steel subjected to hot rolling and slow cooling is subjected to carburizing treatment to obtain Nb and B microalloyed carburized gear steel with high contact fatigue performance, and under the condition that the pressure stress is 4.0 GPa, the rated fatigue life L10 of the Nb and B microalloyed carburized gear steel is larger than or equal to 5 * 10 < 7 >, and the median fatigue life L50 of the Nb and B microalloyed carburized gear steel is larger than or equal to 8.2 * 10 < 7 >.

Description

technical field [0001] The invention belongs to the technical field of gear steel, and relates to a Nb, B microalloyed gear steel and its preparation method, heat treatment method, carburizing treatment method and carburized gear steel, in particular to a Nb, B microalloyed gear steel and Its preparation method, heat treatment method, carburizing treatment method and a kind of Nb, B micro-alloyed carburizing gear steel with high contact fatigue performance. Background technique [0002] Gear steel is a key material with large consumption and high requirements in the field of special steel, and is widely used in machinery, transportation, energy and other fields. The performance requirements of gear steel not only affect the technical and economic indicators such as the service life of the equipment, but also affect the requirements of safety in use. The working environment of the gear is complex and harsh, and the main failure forms are the wear of the meshing surface, pitt...

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
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/48C22C38/06C22C38/54C21D1/18C23C8/00
CPCC22C38/02C22C38/04C22C38/44C22C38/48C22C38/06C22C38/54C21D1/18C23C8/00C21D2211/005C21D2211/009
Inventor 丁毅胡乃悦张建汪开忠胡芳忠杨志强龚志翔杨少朋金国忠吴林
Owner MAANSHAN IRON & STEEL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com