Method for carbonitriding heat treatment of screws
A heat treatment method, carbonitriding technology, applied in the direction of coating, metal material coating process, solid-state diffusion coating, etc., can solve the problems such as the hardness of the shallow surface of the infiltration layer, and achieve high toughness, wear resistance and fatigue strength The effect of improving and reducing the risk of hydrogen embrittlement in electroplating
Active Publication Date: 2015-12-30
佳兴紧固件工业(苏州)有限公司
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The invention discloses a method for carbonitriding heat treatment of screws. The method comprises the following steps of: (1) cleaning the screws needing heat treatment; (2) adjusting the speed of a feeding machine; (3) adjusting the main speed of a continuous furnace to carry out continuous preheating, and carrying out carbonitriding heat treatment on the preheated screws, wherein the preheating temperature is controlled at 860-890DEG C, the carbon potential is 1%-1.2%, and the ammonia gas flow is 0.2-0.5nm<3>/h; (4) carrying out primary quenching; (5) carrying out secondary quenching by adopting quick brightening oil; (6) cleaning the surfaces of the screws; and (7) tempering at 370-420 DEG C for 70-90min. The surface hardness of the screws processed by adopting the method is larger than 450HV0.3, the core hardness is 280-350HV0.3, the toughness is high, the electroplating hydrogen embrittlement risk is low, and the wear resistance and fatigue strength are improved.
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