A kind of nb, v microalloyed gear steel and its preparation method, heat treatment method, carburizing treatment method and carburized gear steel

A micro-alloying, gear steel technology, applied in the field of gear steel, can solve the problem of not being able to adapt to materials with high contact fatigue performance

Active Publication Date: 2022-05-17
MAANSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of nb, v microalloyed gear steel and its preparation method, heat treatment method, carburizing treatment method and carburized gear steel
  • A kind of nb, v microalloyed gear steel and its preparation method, heat treatment method, carburizing treatment method and carburized gear steel
  • A kind of nb, v microalloyed gear steel and its preparation method, heat treatment method, carburizing treatment method and carburized gear steel

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Embodiment Construction

[0073]A Nb, V microalloyed gear steel, comprising the following chemical compositions by weight: 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: 0.05~0.20%; T.O: ≤10ppm, [ H]: ≤1.0ppm, [N]: 80-120ppm, Al / [N]: 2.5~5.0, the rest are Fe and inevitable impurity elements, among which, Km=C+Mn / 6+(Cr+Mo+ V) / 5+(Ni+Cu) / 15+10Nb, and Km: 0.97-1.37.

[0074] It is produced by the process of electric arc furnace smelting - LF refining - RH vacuum treatment - continuous casting - hot rolling - slow cooling, as follows:

[0075] The continuous casting billet is heated and kept at 1230~1280℃ for ≥5h and then rolled into round steel. The rolling temperature is 1120~1180℃, and the final rolling temperature is 930~980℃. After rolling, it is cooled by cooling bed to ≤650℃ and then slowly cooled in the pit. , Slow cooling time of 48h, grinding and peeling after exiting the pit to ensure...

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Abstract

The invention discloses a Nb, V micro-alloyed gear steel and its preparation method, heat treatment method, carburizing treatment method and carburized gear steel, which adopts Nb, V micro-alloying to obtain a ferrite + pearlite structure Nb, V micro-alloyed gear steel; it is produced by the process of electric arc furnace smelting-LF refining-RH vacuum treatment-continuous casting-hot rolling-slow cooling; the gear steel after hot rolling and slow cooling has been heat-treated to obtain resistance Nb, V microalloyed gear steel with tensile strength ≥ 1465MPa, yield strength ≥ 1340MPa, elongation ≥ 14%, reduction of area ≥ 50%, impact energy KV2 ≥ 95J; carburizing the gear steel after hot rolling and slow cooling Finally, the Nb, V microalloyed carburized gear steel with high contact fatigue performance was obtained. Under the condition of compressive stress of 4.0GPa, its rated fatigue life L 10 ≥5×10 7 , median fatigue life L 50 ≥8.2×10 7 .

Description

technical field [0001] The invention belongs to the technical field of gear steel, relates to a Nb, V microalloyed gear steel and a preparation method, a heat treatment method, a carburizing treatment method and a carburized gear steel, in particular to a Nb, V microalloyed gear steel and The preparation method, heat treatment method, carburizing treatment method and Nb, V microalloying carburizing gear steel with high contact fatigue performance are provided. Background technique [0002] Gear steel is a key material with a large amount 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 life of the equipment, but also affect the requirements of safety in use. The working environment of gears is complex and harsh, and the main failure modes are wear of meshing surfaces, pitting spalling cause...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C21D6/00C21D8/00C22C33/04C23C8/00
CPCC22C38/02C22C38/04C22C38/06C22C38/44C22C38/48C22C38/46C22C33/04C21D8/005C21D6/004C21D6/005C21D6/008C23C8/00C21D2211/005C21D2211/009C21D2211/008Y02P10/20
Inventor 丁毅胡芳忠胡乃悦汪开忠张建龚志翔杨志强陈世杰金国忠尹德福
Owner MAANSHAN IRON & STEEL CO LTD
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