Gas nitriding process of nitriding furnace
2024-08-03 12:01:30
Overview of gas nitriding process of nitriding furnace: ammonia gas is introduced into the stainless steel vacuum sealed tank in the nitriding furnace, and heated to 520 ° C for a suitable time, depending on the material of the workpiece and the thickness of the layer, 3-90 hours. The nitrogen-containing strengthening layer is obtained on the surface of the nitriding workpiece to obtain high hardness, high wear resistance, high fatigue limit and good wear resistance.
Gas nitriding process operation method of nitriding furnace:
1. The mold before nitriding must be a workpiece that has been subjected to normalizing or quenching and tempering.
2. First scrub the surface of the workpiece with gasoline and alcohol. There should be no rust, oil or dirt.
3. After loading into the furnace, tighten the cover tightly to tighten the bolts.
4. Pass the furnace tank and the cover inlet into the cooling water for circulating water cooling. The lower end of the outer water jacket of the furnace cover is water inlet, the upper end is water outlet, the furnace tank is separately filled with water, and the water is separately drained. All the water pipes of the nitriding furnace cover can be connected in series according to the principle of low inlet and high, and one port is watered, one port is drained. .
5. Nitrogen gas should be sent before heating, and the flow rate should be more than doubled when used.
After 10 minutes of exhaust, set the temperature control meter to 150 °C, the automatic heating switch is turned to open, while the exhaust is heated, 150 ° C for 2h exhaust, then set the temperature control meter to 530 ° C, ammonia The flow rate is reduced, the positive pressure in the furnace is maintained, and the exhaust port has a small airflow upward pressure. When the furnace temperature rises to 530 ° C, the constant temperature and constant flow nitriding is 3-20 h, and then the ammonia gas pressure is adjusted to a larger degree. Maintain moderate pressure, nitriding 4-70h, then reduce the pressure of ammonia gas, reduce nitrogen for 1-2h, cut off the power supply, stop heating, give a small amount of ammonia gas, maintain a positive pressure in the furnace, and wait for the temperature of the furnace The supply of ammonia can be stopped until it is below 150 °C.
Gas nitriding process operation method of nitriding furnace:
1. The mold before nitriding must be a workpiece that has been subjected to normalizing or quenching and tempering.
2. First scrub the surface of the workpiece with gasoline and alcohol. There should be no rust, oil or dirt.
3. After loading into the furnace, tighten the cover tightly to tighten the bolts.
4. Pass the furnace tank and the cover inlet into the cooling water for circulating water cooling. The lower end of the outer water jacket of the furnace cover is water inlet, the upper end is water outlet, the furnace tank is separately filled with water, and the water is separately drained. All the water pipes of the nitriding furnace cover can be connected in series according to the principle of low inlet and high, and one port is watered, one port is drained. .
5. Nitrogen gas should be sent before heating, and the flow rate should be more than doubled when used.
After 10 minutes of exhaust, set the temperature control meter to 150 °C, the automatic heating switch is turned to open, while the exhaust is heated, 150 ° C for 2h exhaust, then set the temperature control meter to 530 ° C, ammonia The flow rate is reduced, the positive pressure in the furnace is maintained, and the exhaust port has a small airflow upward pressure. When the furnace temperature rises to 530 ° C, the constant temperature and constant flow nitriding is 3-20 h, and then the ammonia gas pressure is adjusted to a larger degree. Maintain moderate pressure, nitriding 4-70h, then reduce the pressure of ammonia gas, reduce nitrogen for 1-2h, cut off the power supply, stop heating, give a small amount of ammonia gas, maintain a positive pressure in the furnace, and wait for the temperature of the furnace The supply of ammonia can be stopped until it is below 150 °C.
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