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Gas nitriding process of 00Ni18Co8Mo5AlTi high-strength maraging steel

A technology of maraging steel and gas nitriding, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problem that the nitriding layer cannot be formed, the gas nitriding process is still blank, and the activity is hindered. Nitrogen atom infiltration and other problems can achieve the effects of small distortion, improved wear resistance and fatigue resistance, and excellent strength

Active Publication Date: 2011-01-12
无锡能以信科技有限公司
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  • Application Information

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Problems solved by technology

Among them, nitriding treatment is undoubtedly a better choice, but because the surface of this material has a passivation film that hinders the infiltration of active nitrogen atoms, the conventional nitriding method cannot form an effective nitriding layer. The gas nitriding process of 00Ni18Co8Mo5AlTi material is still blank

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  • Gas nitriding process of 00Ni18Co8Mo5AlTi high-strength maraging steel
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Embodiment Construction

[0022] A gas nitriding process for 00Ni18Co8Mo5AlTi high-strength maraging steel according to the present invention, the gears whose material is 00Ni18Co8Mo5AlTi are carried out nitriding treatment, during production, according to each batch of 20 gears, a total of 3 batches are respectively carried out nitriding Nitrogen treatment:

[0023] 1. Receive the steel rod (φ35mm×200mm) of the same purchase batch and the material is 00Ni18Co8Mo5AlTi, and perform solid solution treatment:

[0024] Heating equipment: box-type resistance furnace Heating temperature: 820±10°C

[0025] Heat preservation time: 70-90 minutes Cooling method: air cooling

[0026] 2. Process all the gears to the finished product size, and take another material that has undergone solid solution, and process 2 heat treatment test pieces for furnace nitriding in each batch. The size of the test pieces is: φ32mm×φ15mm×10mm (outer diameter × inner diameter × height).

[0027] 3. Prepare the heating equipment and...

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Abstract

The invention discloses a gas nitriding process of 00Ni18Co8Mo5AlTi high-strength maraging steel, which comprises the procedures of: carrying out the solution treatment on raw materials and processing parts into the finished size; laying ammonium chloride and quartz sand through drying and uniformly blending at the bottom of a nitriding tank; eliminating grease dirt and drying 00Ni18Co8Mo5AlTi steel parts; carrying out the sand blasting processing on the parts before the nitriding processing; introducing ammonia and discharging air in the tank after enchasing and sealing the parts, carrying out the nitriding processing by a two-stage method during temperature rise along with a furnace when the resolution ratio of the ammonia in the tank is zero; switching off a power supply of a heating furnace and continuously supplying the gas to maintain the positive pressure in the nitriding tank when the nitriding processing and temperature maintenance are finished; removing the nitriding tank from the heating furnace and cooling in the air when the temperature is reduced to be below 300 DEG C along with the furnace; and stopping supplying the gas and taking out the nitriding parts when the temperature of the nitriding tank is reduced to be below 150 DEG C. The invention can ensure that the distortion of the size and the shape of the nitriding parts is less; the heart has good strength, plasticity and toughness; and the abrasive resistance and the fatigue resistance on the surface of the nitriding parts can be remarkably enhanced.

Description

technical field [0001] The invention relates to a nitriding heat treatment process for high-strength maraging steel, in particular to a gas nitriding process for 00Ni18Co8Mo5AlTi material. Background technique [0002] Nitriding heat treatment is to infiltrate active nitrogen atoms into the surface of parts to form a layer of extremely hard alloy nitrides to improve the hardness, wear resistance and corrosion resistance of the surface layer. Nitriding process methods mainly include gas nitriding, liquid nitriding and ion nitriding, among which gas nitriding is dominant. Nitriding treatment is usually carried out at 460-650°C, and its biggest advantage is that the parts have less distortion after nitriding. At present, the steel grades for nitriding treatment mainly include alloy structural steel and various stainless steels. [0003] 00Ni18Co8Mo5AlTi is a high-strength maraging steel with excellent mechanical properties. After solution treatment, its microstructure is ultr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/26
Inventor 张长英
Owner 无锡能以信科技有限公司
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