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

A micro-alloying and carburizing technology, applied in the field of gear steel, can solve the problem of inability to adapt to materials with high contact fatigue performance

Active Publication Date: 2022-04-19
MAANSHAN IRON & STEEL CO LTD
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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

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

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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...

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Abstract

The invention discloses a Nb, B micro-alloyed gear steel and its preparation method, heat treatment method, carburizing treatment method and carburized gear steel, which adopts Nb and B micro-alloying to obtain ferrite + pearlite structure Nb, B 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, B microalloyed gear steel with tensile strength ≥ 1450MPa, yield strength ≥ 1340MPa, elongation ≥ 14%, reduction of area ≥ 50%, impact energy KV2 ≥ 95J; carburizing the gear steel after hot rolling and slow cooling The Nb, B 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, 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

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Application Information

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Patent Type & Authority Patents(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
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