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
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[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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