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

A heat treatment method and micro-alloying technology, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of materials that cannot adapt to high contact fatigue performance

Active Publication Date: 2021-09-14
MAANSHAN IRON & STEEL CO LTD
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  • 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

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  • Nb, V and Ti microalloyed gear steel and preparation method thereof, heat treatment method and carburizing treatment method thereof and carburized gear steel
  • Nb, V and Ti microalloyed gear steel and preparation method thereof, heat treatment method and carburizing treatment method thereof and carburized gear steel
  • Nb, V and Ti microalloyed gear steel and preparation method thereof, heat treatment method and carburizing treatment method thereof and carburized gear steel

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Embodiment Construction

[0075] A kind of Nb, V, Ti micro-alloyed gear steel, comprising the following chemical components 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%, V: 0.05~0.15%, Ti 0.05~0.15 %, T.O: ≤10ppm, [H]: ≤1.0ppm, [N]: ≤80ppm, the rest are Fe and unavoidable impurity elements, among them, Km=C+Mn / 6+(Cr+Mo+V) / 5+(Ni+Cu) / 15+10Nb+Al / 15(N-Ti / 3.4), and Km: 0.97-1.37.

[0076] It adopts the process of electric arc furnace smelting-LF refining-RH vacuum treatment-continuous casting-hot rolling-slow cooling, as follows:

[0077] It adopts the process of electric arc furnace smelting-LF refining-RH vacuum treatment-continuous casting-hot rolling-slow cooling, as follows:

[0078] 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-...

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Abstract

The invention discloses Nb, V and Ti microalloyed gear steel and a preparation method thereof, a heat treatment method, a carburizing treatment method and carburized gear steel. By adopting Nb, V and Ti microalloying, the Nb, V and Ti microalloyed gear steel with a ferrite and pearlite structure is obtained; the process of electric arc furnace smelting, LF refining, RH vacuum treatment, continuous casting, hot rolling and slow cooling is adopted for production; the Nb, V and Ti microalloyed gear steel with the tensile strength of larger than or equal to 1455 MPa, the yield strength of larger than or equal to 1320 MPa, the elongation rate of larger than or equal to 15%, the percentage reduction of area of larger than or equal to 50% and the impact energy KV2 of larger than or equal to 95 J is obtained after the gear steel subjected to hot rolling and slow cooling is subjected to heat treatment; after the gear steel subjected to hot rolling and slow cooling is subjected to carburizing treatment, Nb, V and Ti microalloyed carburizing gear steel with high contact fatigue performance is obtained; and under the condition that the pressure stress is 4.0 GPa, the rated fatigue life L10 of the gear steel is larger than or equal to 5*10<7>, and the median fatigue life L50 of the 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, V, Ti microalloyed gear steel and its preparation method, heat treatment method, carburizing treatment method and carburized gear steel, in particular to a Nb, V, Ti microalloy The invention discloses a carburized gear steel, a preparation method thereof, a heat treatment method, a carburizing treatment method, and a Nb, V, Ti microalloyed carburized 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 fo...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/48C22C38/06C22C38/50C22C38/46C22C33/06C21D1/26C21D8/00C21D1/18C23C8/22C23F17/00
CPCC22C38/02C22C38/04C22C38/44C22C38/48C22C38/06C22C38/50C22C38/46C22C38/001C22C33/06C21D1/26C21D8/005C21D1/18C23C8/22C23F17/00C21D2211/005C21D2211/009C21D2211/008
Inventor 丁毅胡乃悦汪开忠胡芳忠张建杨少朋龚志翔陈世杰金国忠姜婷
Owner MAANSHAN IRON & STEEL CO LTD
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