CN100387748C - Air/hydrocarbon organic gas ion nitrogen, carbon and oxygen co-infiltration process of steel - Google Patents

Abstract

The present invention relates to air/ carbon hydrogen organic gas iron nitrogen, carbon and oxygen multicomponent metallization technology for steel, which relates to steel surface intensifying technology. The present invention mainly uses gas which is mostly filled with air as gas sources so as to carry out ion multicomponent metallization. The cost can be reduced, the pollution is reduced, and the abrasive resistance and the corrosion resistance of a nitriding workpiece are improved. The present invention comprises the steps: a workpiece which is quenched and tempered is cleaned and dried and is put in a furnace, an ion nitriding furnace is vacuated, the DC voltage is input, the air and the organic gas are input according to proportion, and simultaneously, the heating, the thermal insulation, the furnace cooling and the furnace discharge are carried out. The present invention is suitable for the surface intensification of carbon steel, alloy structural steel and die steel.

Description

Air/hydrocarbon organic gas ion nitrogen, carbon and oxygen co-infiltration process of steel

Technical field:

The invention belongs to the steel surface strengthening technology. Suitable for surface strengthening of carbon steel, alloy structural steel and tool steel.

Background technique:

The Chinese invention patent application number is 200410021642.6, and its invention name is "Air Ion Oxygen Nitriding Technology Patent for Ferrous Metals". Close the furnace body, and use a mechanical pump to evacuate the ion nitriding furnace to a vacuum of 50-120Pa; (2) Input 10-1000V adjustable DC high voltage to the cathode and anode to break up the arc in the furnace. DC voltage until there is no or less scattered arc; (3) Ammonia gas or nitrogen-hydrogen mixture gas is introduced into the nitriding furnace; (4) The workpiece is heated to 500-580°C at a speed of 50-100°C/hour (5) After 0.5-60 hours of heat preservation, turn off the gas source and power supply, use a mechanical pump to remove the ammonia gas or nitrogen-hydrogen mixture in the ion nitriding furnace, and cool it to 50°C with the furnace at a speed of 50-100°C/hour. Stop the furnace after ~150°C, and start the furnace to take out the workpiece after the workpiece is cooled to room temperature in the furnace. But this patent application is to utilize the air and ammonia as the source of nitriding gas, and there is ammonia pollution to the environment.

In this process flow, the nitriding gas is connected to the lower gas nozzle of the drying cylinder through the rubber tube, and after entering the desiccant layer in the cylinder through the gas nozzle, the upper gas nozzle is connected to the lower gas nozzle of the gas flowmeter by the rubber tube. , Open the needle valve of the flowmeter, the nitriding gas passes through the needle valve and the glass tube, and then enters the ion nitriding furnace from the upper gas nozzle with a rubber tube.

Invention content:

The purpose of the present invention is to aim at above-mentioned deficiencies in the prior art, provide a kind of air/hydrocarbon organic gas nitrogen, carbon, oxygen co-infiltration process of steel, utilize this process to carry out ion multi-component co-infiltration to steel, solve ammonia gas to environment pollution and cost reduction issues.

In order to realize the above-mentioned purpose of the invention, the present invention is carried out according to the following sequential steps:

(1) Clean and dry the workpiece after quenching and tempering, and place it on the cathode plate;

(2) Close the furnace body, and use a mechanical pump to evacuate the ion nitriding furnace to a vacuum of 50-120Pa;

(3) Turn on the power switch, input 10-1000V adjustable DC high voltage from the power supply to the cathode and anode to break up the arc in the furnace, and then adjust the DC voltage until there is no or less scattered arc;

(4) Into the nitriding furnace at the same time into the flow rate of 0.1 ~ 0.6m ³ /h and 0.00006 ~ 0.06m ³ /h air and hydrocarbon organic gas, at a rate of 50 ~ 100 ℃ / hour by glow discharge The workpiece is heated to 500-580°C;

(5) After 0.5 to 60 hours of heat preservation, turn off the gas source and power supply, use a mechanical pump to remove the gas in the ion nitriding furnace, cool the furnace to 50 to 150°C at a speed of 50 to 100°C/hour, and then stop the furnace. After the workpiece is cooled to room temperature in the furnace, the furnace is opened to take out the workpiece.

Compared with the prior art, the present invention has the following technical effects:

Compared with ordinary ion nitriding, the air/gasoline ion multiple co-infiltration process mainly uses air and a small amount of gasoline, without ammonia, nitrogen and hydrogen, no pollution, and reduces production costs by 10%.

Description of drawings:

Fig. 1 is the schematic diagram of the air/gasoline ion multi-component co-infiltration process air supply system that air is used as the nitriding gas source;

Fig. 2 is the microhardness curve figure of air and acetylene after the process of the present invention has been processed for 40Cr steel with the flow rates of 0.5m ³ /h and 0.00048m ³ /h respectively;

Fig. 3 is the microhardness curve figure of 40Cr steel flow rate is respectively 0.2m ³ /h and 0.00012m ³ /h air and acetylene after the process of the present invention;

Fig. 4 is the microhardness curve graph of the air and acetylene with flow rates of 0.25m ³ /h and 0.00012m ³ /h respectively for 45 steel after the process of the present invention;

Fig. 5 is the microhardness curve graph of the air and liquefied petroleum gas with flow rates of 0.3m ³ /h and 0.00012m ³ /h for 40Cr steel after the process of the present invention;

Fig. 6 is the microhardness curve graph of 45 steels with air and liquefied petroleum gas with flows of 0.4m ³ /h and 0.00048m ³ /h respectively after the process of the present invention;

Fig. 7 is the microhardness curve graph of 45 steel after the air and liquefied petroleum gas with flow rates of 0.3m ³ /h and 0.00048m ³ /h are treated by the process of the present invention;

In Fig. 1, 1 is an oil storage tank, 2, 3 and 4 are flowmeters, 5 is a drying bottle, 6 is an ion nitriding furnace body, 7 is a workpiece, and 8 is a cathode plate. In Figures 2 to 7, the abscissa indicates the distance from the surface, and the ordinate indicates the hardness value (HV _0.2 )

Detailed ways:

Example 1: Air/acetylene ion multiple co-infiltration process of 40Cr steel

(1) Clean and dry the workpiece after quenching and tempering, and place it on the cathode plate;

(2) Close the furnace body, and vacuum the ion nitriding furnace to 110Pa with a mechanical pump;

(3) Turn on the power switch, input 10-1000V adjustable DC high voltage from the power supply to the cathode and anode to break up the arc in the furnace, and then adjust the DC voltage until there is no or less scattered arc;

(4) Air and acetylene with a flow rate of 0.2m ³ /h and 0.00012m ³ /h are introduced into the nitriding furnace at the same time, and the workpiece is heated to 500°C by glow discharge at a rate of 100°C/h;

(5) After 5 hours of heat preservation, turn off the gas source and power supply, use a mechanical pump to remove the gas in the ion nitriding furnace, cool down to 100°C with the furnace at a speed of 100°C/h, and then stop the furnace, and start the furnace after the workpiece cools to room temperature Take out the workpiece.

Embodiment 2: Air/acetylene ion nitrogen, carbon, oxygen co-infiltration process of 40Cr steel

(1) (2) (3) step is identical with embodiment 1 (1) (2) (3) step;

(4) Air and acetylene with flow rates of 0.5m ³ /h and 0.00048m ³ /h are introduced into the nitriding furnace at the same time, and the workpiece is heated to 520°C by glow discharge at a rate of 100°C/h;

Embodiment 3: Air/acetylene ion nitrogen, carbon, oxygen co-infiltration process of 45 steel

(1) (2) (3) step is identical with embodiment 1 (1) (2) (3) step;

(4) Air and acetylene with flow rates of 0.5m ³ /h and 0.00048m ³ /h are introduced into the nitriding furnace at the same time, and the workpiece is heated to 520°C by glow discharge at a rate of 100°C/h;

Embodiment 4: Air/acetylene ion nitrogen, carbon, oxygen co-infiltration process of 45 steel

(1) (2) (3) step is identical with embodiment 1 (1) (2) (3) step;

(4) Air and acetylene with flow rates of 0.25m ³ /h and 0.00012m ³ /h are introduced into the nitriding furnace at the same time, and the workpiece is heated to 520°C by glow discharge at a speed of 100°C/h;

Embodiment 5: Air/liquefied petroleum gas ion nitrogen, carbon, oxygen co-infiltration process of 40Cr steel

(1) (2) (3) step is identical with embodiment 1 (1) (2) (3) step;

(4) Air and liquefied petroleum gas with a flow rate of 0.25m ³ /h and 0.00012m ³ /h are introduced into the nitriding furnace at the same time, and the workpiece is heated to 520°C by glow discharge at a speed of 100°C/h;

Embodiment 6: 40Cr air/liquefied petroleum gas ion nitrogen, carbon, oxygen co-infiltration process

(1) (2) (3) step is identical with embodiment 1 (1) (2) (3) step;

(4) Air and liquefied petroleum gas with a flow rate of 0.4m ³ /h and 0.00048m ³ /h are introduced into the nitriding furnace at the same time, and the workpiece is heated to 560°C by glow discharge at a speed of 100°C/h;

Embodiment 7: Air/liquefied petroleum gas ion nitrogen, carbon and oxygen co-infiltration process of 45 steel

(1) (2) (3) step is identical with embodiment 1 (1) (2) (3) step;

(4) Air and liquefied petroleum gas with a flow rate of 0.2m ³ /h and 0.00012m ³ /h are introduced into the nitriding furnace at the same time, and the workpiece is heated to 520°C by glow discharge at a speed of 100°C/h;

Embodiment 8: Air/liquefied petroleum gas ion nitrogen, carbon and oxygen co-infiltration process of 45 steel

(1) (2) (3) step is identical with embodiment 1 (1) (2) (3) step;

(4) Air and liquefied petroleum gas with a flow rate of 0.3m ³ /h and 0.00048m ³ /h are introduced into the nitriding furnace at the same time, and the workpiece is heated to 520°C by glow discharge at a speed of 100°C/h;

In embodiments 2-8, the fifth step is the same as the fifth step of embodiment 1.

Claims (9)

1. the air of a steel/hydrocarbon organic gaseous ion nitrogen, carbon, oxygen confusion technology is characterized in that this technology carries out according to the following steps:

(1), places on the cathode disc with the workpiece cleaning after modified, drying;

(2) close body of heater, will be evacuated in the ion-nitriding furnace to 50～120Pa with mechanical pump;

(3) connect power switch, to stove, break up arc to the adjustable high direct voltage of negative electrode input 10～1000V by power supply, break up the arc rareness after, straightening stream voltage is until stopping to break up arc again;

(4) in nitriding furnace, feed flow simultaneously and be respectively 0.1～0.6m ³/ h and 0.00006～0.06m ³/ h air and hydrocarbon organic gas are heated to 500～580 ℃ by glow discharge with workpiece with 50～100 ℃/hour speed;

(5) insulation was closed source of the gas and power supply after 0.5～60 hour, got rid of gas in the ion-nitriding furnace with mechanical pump, be chilled to 50～150 ℃ with 50～100 ℃/hour speed with stove after blowing out, treat that workpiece takes out workpiece in the blow-on to the room temperature of stove internal cooling.

2. according to air/hydrocarbon organic gaseous ion nitrogen, carbon, the oxygen confusion technology of the steel described in the claim 1, it is characterized in that the air/acetylene ion multi element copermeation technology of 40Cr steel workpiece carries out according to the following steps:

(1), places on the cathode disc with the workpiece cleaning after modified, drying;

(2) close body of heater, will be evacuated in the ion-nitriding furnace to 110Pa with mechanical pump;

(3) connect power switch, to stove, break up arc to the adjustable high direct voltage of negative electrode input 10～1000V by power supply, break up the arc rareness after, straightening stream voltage is until stopping to break up arc again;

(4) in nitriding furnace, feed flow simultaneously and be respectively 0.2m ³/ h and 0.00012m ³The air of/h and acetylene are heated to 500 ℃ by glow discharge with workpiece with 100 ℃/hour speed;

(5) insulation was closed source of the gas and power supply after 5 hours, got rid of gas in the ion-nitriding furnace with mechanical pump, be chilled to 100 ℃ with 100 ℃/hour speed with stove after blowing out, treat that workpiece takes out workpiece in the blow-on to the room temperature of stove internal cooling.

3. according to the steel air described in the claim 1/hydrocarbon organic gaseous ion nitrogen, carbon, oxygen confusion technology, it is characterized in that the air/acetylene ion multi element copermeation technology of 40Cr steel carries out according to the following steps:

(1), places on the cathode disc with the workpiece cleaning after modified, drying;

(2) close body of heater, will be evacuated in the ion-nitriding furnace to 110Pa with mechanical pump;

(3) connect power switch, to stove, break up arc to the adjustable high direct voltage of negative electrode input 10～1000V by power supply, break up the arc rareness after, straightening stream voltage is until stopping to break up arc again;

(4) in nitriding furnace, feed flow simultaneously and be respectively 0.5m ³/ h and 0.00048m ³The air of/h and acetylene are heated to 520 ℃ by glow discharge with workpiece with 100 ℃/hour speed;

(5) insulation was closed source of the gas and power supply after 5 hours, got rid of gas in the ion-nitriding furnace with mechanical pump, be chilled to 100 ℃ with 100 ℃/hour speed with stove after blowing out, treat that workpiece takes out workpiece in the blow-on to the room temperature of stove internal cooling.

4. according to air/hydrocarbon organic gaseous ion nitrogen, carbon, the oxygen confusion technology of the steel described in the claim 1, it is characterized in that the air/acetylene ion multi element copermeation technology of 45 steel workpieces carries out according to the following steps:

(1), places on the cathode disc with the workpiece cleaning after modified, drying;

(2) close body of heater, will be evacuated in the ion-nitriding furnace to 110Pa with mechanical pump;

(3) connect power switch, to stove, break up arc to the adjustable high direct voltage of negative electrode input 10～1000V by power supply, break up the arc rareness after, straightening stream voltage is until stopping to break up arc again;

(4) in nitriding furnace, feed flow simultaneously and be respectively 0.5m ³/ h and 0.00048m ³The air of/h and acetylene are heated to 520 ℃ by glow discharge with workpiece with 100 ℃/hour speed;

(5) insulation was closed source of the gas and power supply after 5 hours, got rid of gas in the ion-nitriding furnace with mechanical pump, be chilled to 100 ℃ with 100 ℃/hour speed with stove after blowing out, treat that workpiece takes out workpiece in the blow-on to the room temperature of stove internal cooling.

5. according to air/hydrocarbon organic gaseous ion nitrogen, carbon, the oxygen confusion technology of the steel described in the claim 1, it is characterized in that the air/acetylene ion multi element copermeation technology of 45 steel carries out according to the following steps:

(1), places on the cathode disc with the workpiece cleaning after modified, drying;

(2) close body of heater, will be evacuated in the ion-nitriding furnace to 110Pa with mechanical pump;

(3) connect power switch, to stove, break up arc to the adjustable high direct voltage of negative electrode input 10～1000V by power supply, break up the arc rareness after, straightening stream voltage is until stopping to break up arc again;

(4) in nitriding furnace, feed flow simultaneously and be respectively 0.25m ³/ h and 0.00012m ³The air of/h and acetylene are heated to 520 ℃ by glow discharge with workpiece with 100 ℃/hour speed;

(5) insulation was closed source of the gas and power supply after 5 hours, got rid of gas in the ion-nitriding furnace with mechanical pump, be chilled to 100 ℃ with 100 ℃/hour speed with stove after blowing out, treat that workpiece takes out workpiece in the blow-on to the room temperature of stove internal cooling.

6. according to air/hydrocarbon organic gaseous ion nitrogen, carbon, the oxygen confusion technology of the steel described in the claim 1, it is characterized in that the air/liquefied petroleum gas (LPG) ion multi element copermeation technology of 40Cr steel carries out according to the following steps:

(1), places on the cathode disc with the workpiece cleaning after modified, drying;

(2) close body of heater, will be evacuated in the ion-nitriding furnace to 110Pa with mechanical pump;

(3) connect power switch, to stove, break up arc to the adjustable high direct voltage of negative electrode input 10～1000V by power supply, break up the arc rareness after, straightening stream voltage is until stopping to break up arc again;

(4) in nitriding furnace, feed flow simultaneously and be respectively 0.25m ³/ h and 0.00012m ³The air of/h and liquefied petroleum gas (LPG) are heated to 520 ℃ by glow discharge with workpiece with 100 ℃/hour speed;

(5) insulation was closed source of the gas and power supply after 5 hours, got rid of gas in the ion-nitriding furnace with mechanical pump, be chilled to 100 ℃ with 100 ℃/hour speed with stove after blowing out, treat that workpiece takes out workpiece in the blow-on to the room temperature of stove internal cooling.

7. according to the steel air described in the claim 1/hydrocarbon organic gaseous ion nitrogen, carbon, oxygen confusion technology, it is characterized in that air/liquefied petroleum gas (LPG) ion-oxygen, carbon, the nitrogen confusion technology of 40Cr steel carries out according to the following steps:

(1), places on the cathode disc with the workpiece cleaning after modified, drying;

(2) close body of heater, will be evacuated in the ion-nitriding furnace to 110Pa with mechanical pump;

(3) connect power switch, to stove, break up arc to the adjustable high direct voltage of negative electrode input 10～1000V by power supply, break up the arc rareness after, straightening stream voltage is until stopping to break up arc again;

(4) in nitriding furnace, feed flow simultaneously and be respectively 0.4m ³/ h and 0.00048m ³/ h air and liquefied petroleum gas (LPG) are heated to 560 ℃ by glow discharge with workpiece with 100 ℃/hour speed;

(5) insulation was closed source of the gas and power supply after 5 hours, got rid of gas in the ion-nitriding furnace with mechanical pump, be chilled to 100 ℃ with 100 ℃/hour speed with stove after blowing out, treat that workpiece takes out workpiece in the blow-on to the room temperature of stove internal cooling.

8. according to air/hydrocarbon organic gaseous ion nitrogen, carbon, the oxygen confusion technology of the steel described in the claim 1, it is characterized in that the air/liquefied petroleum gas (LPG) ion multi element copermeation technology of 45 steel carries out according to the following steps:

(1), places on the cathode disc with the workpiece cleaning after modified, drying;

(2) close body of heater, will be evacuated in the ion-nitriding furnace to 110Pa with mechanical pump;

(3) connect power switch, to stove, break up arc to the adjustable high direct voltage of negative electrode input 10～1000V by power supply, break up the arc rareness after, straightening stream voltage is until stopping to break up arc again;

(4) in nitriding furnace, feed flow simultaneously and be respectively 0.2m ³/ h and 0.00012m ³The air of/h and liquefied petroleum gas (LPG) are heated to 520 ℃ by glow discharge with workpiece with 100 ℃/hour speed;

(5) insulation was closed source of the gas and power supply after 5 hours, got rid of gas in the ion-nitriding furnace with mechanical pump, be chilled to 100 ℃ with 100 ℃/hour speed with stove after blowing out, treat that workpiece takes out workpiece in the blow-on to the room temperature of stove internal cooling.

9. according to air/hydrocarbon organic gaseous ion nitrogen, carbon, the oxygen confusion technology of the steel described in the claim 1, it is characterized in that the air/liquefied petroleum gas (LPG) ion multi element copermeation technology of 45 steel carries out according to the following steps:

(1), places on the cathode disc with the workpiece cleaning after modified, drying;

(2) close body of heater, will be evacuated in the ion-nitriding furnace to 110Pa with mechanical pump;

(3) connect power switch, to stove, break up arc to the adjustable high direct voltage of negative electrode input 10～1000V by power supply, break up the arc rareness after, straightening stream voltage is until stopping to break up arc again;

(4) in nitriding furnace, feed flow simultaneously and be respectively 0.3m ³/ h and 0.00048m ³The air of/h and liquefied petroleum gas (LPG) are heated to 520 ℃ by glow discharge with workpiece with 100 ℃/hour speed;

(5) insulation was closed source of the gas and power supply after 5 hours, got rid of gas in the ion-nitriding furnace with mechanical pump, be chilled to 100 ℃ with 100 ℃/hour speed with stove after blowing out, treat that workpiece takes out workpiece in the blow-on to the room temperature of stove internal cooling.

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