What are the technical requirements for nitriding treatment, and what materials are applicable?

Ion nitriding is mainly suitable for alloy steels. The main manufacturer is Beijing Electric Furnace Factory.

A new generation of program-controlled electric pulse multi-functional ion bombardment furnace.

1. A second heat source is set up that can automatically adjust the temperature of the whole furnace. A number of electric heater systems that can automatically adjust the temperature are used to replace the original single manual heating system, and the alternating current that is originally supplied to the electric heater with low voltage and high current (110V) is improved into direct current with high voltage and low current. The electrical interference is reduced, so that the temperature difference between the upper and lower parts of the isothermal zone in the furnace is controlled within 2; Increase the maximum operating temperature to 950 or 1100 (structure and material should be adjusted); The manufacture of high-power and large-capacity ion heating equipment has the ability to be localized.

2. The pulse power supply using single-tube high-power high-voltage resistant (2000V) IGBT, pulse frequency 1KHz 30kHz, duty cycle peak current 0 600A has been developed, and the circuit of voltage and current sharing has been cancelled, and the circuit work is simple and reliable, and the DC pulse can be adjusted, which can alleviate the hollow cathodic effect and sharp angle discharge, so that the glow work is more stable and reliable.

Special heat treatment for special materials.

It is more suitable for special high-end materials, and ordinary materials must also use this process if they want to break through the cost performance of parts.

2-1 The special ion nitriding of titanium alloy makes the surface layer of titanium alloy form a hard tin layer, which is golden yellow and very beautiful; Very low coefficient of wear and therefore very wear-resistant; Due to its ability to withstand high temperatures and steam cavitation, TIN is suitable for making devices such as steam valves.

2-2 Some steels can be vacuum annealed because they are afraid of oxidation and are afraid of internal stress.

2-3 There are many soft magnetic materials in industrial or civil equipment, hoping to obtain higher permeability ( ) and lower coercivity (HC), but the impurities and carbon content in the material in the production have a great impact on HC.

2-4 Such as F51 steel, N80 steel and X210CRW12 steel, which require corrosion resistance, wear resistance, and trace deformation, after special heat treatment, the white bright layer of single-phase structure is 106um, 29um and 10um respectively, brittle first-class, deformation 1um 5um.

2-5 The austenitic stainless steel 316L sphere is not easy to nitride and impermeable, and the physical permeability layer of the sphere is deformed after being treated by the special ion process.

Nitriding treatment. It refers to a chemical heat treatment process that allows nitrogen crying atoms to penetrate into the surface of the workpiece in a certain medium at a certain temperature. Nitriding products have excellent wear resistance, fatigue resistance, corrosion resistance and high temperature resistance.

Function. Increase the wear resistance, surface hardness, fatigue limit and corrosion resistance of steel parts.

Technical process process requirements.

Part surface cleaning prior to nitriding.

For most parts, you can use the gas degreasing method to nitrid immediately after degreasing. Some parts also need to be cleaned with gasoline, but if the final processing method before nitriding is polished, grinding, polishing, etc., the surface layer that hinders nitriding may occur, resulting in defects such as uneven nitriding layer or bending after nitriding. In this case, it is advisable to use one of the following two methods to remove the surface layer.

The first method is to remove the oil with gas before nitriding. The surface is then abrasively cleaned using alumina powder. The second method is to treat the surface with a phosphate coating.

Exhaust air for nitriding furnaces.

The treated parts are placed in a nitriding furnace and the lid is sealed before heating, but the air must be removed from the furnace before heating to 150.

The main function of the furnace is to prevent ammonia.

When decomposing, it is in contact with air and causes ** fission gas, and prevents oxidation of the surface of the treated object and scaffold. There are two types of gases: ammonia and nitrogen.

The essentials for removing air from the furnace are as follows:

Once the treated parts are installed, the lid is sealed and anhydrous ammonia is started to flow as much as possible.

Set the automatic temperature control of the furnace to 150 and start heating (note that the furnace temperature cannot be higher than 150).

When the air in the furnace is discharged to less than 10%, or the gas discharged contains more than 90% of Zheng Yuanhui's NH3, the furnace temperature is raised to the nitriding temperature.

The decomposition rate of ammonia.

Nitriding is carried out by the contact of paving and other alloying elements with the primary ecological nitrogen, but the production of primary ecological nitrogen, that is, the steel itself becomes a catalyst when ammonia comes into contact with the steel in the heating.

It promotes the decomposition of ammonia.

Although nitriding can be done under ammonia with various decomposition rates, a decomposition rate of 15 30% is generally used, and it is maintained for at least 4 10 hours according to the thickness required for nitriding, and the treatment temperature is maintained at about 520.

Cooling. Most industrial nitriding furnaces have a heat exchanger to rapidly cool the furnace and the parts to be treated after the nitriding work is completed. That is, after the nitriding is completed, the heating power is turned off to reduce the furnace temperature by about 50, and then the ammonia flow rate is doubled and the heat exchanger is started.

At this time, it is necessary to observe whether there are air bubbles overflowing in the glass bottle connected to the exhaust pipe to confirm the positive pressure in the furnace. After waiting for the ammonia gas to settle into the furnace, the ammonia flow can be reduced until the positive pressure in the furnace is maintained. When the furnace temperature drops below 150 °C, the furnace lid can be opened only after the gas removal method described above is used to introduce air or nitrogen.

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Compared with carburizing, nitriding is characterized by: high surface hardness (1000 2000HV), high wear resistance, and high thermal hardness.

The fatigue hardness of ammonia infiltrated parts is high. The deformation of the nitriding parts is small. Ammonia infiltrated parts have good corrosion resistance.

Nitriding, also known as nitriding, is a chemical heat treatment process in which nitrogen atoms are infiltrated into the surface of a steel part. It has higher surface hardness, wear resistance, and corrosion resistance. Carburizing is a kind of metal surface treatment, the specific method is to put the workpiece into the active carburizing medium, heat to the single-phase austenite zone of 900-950 °C, and after the heat preservation time is enough, the activated carbon atoms decomposed in the carburizing medium penetrate into the surface of the steel part, so as to obtain the standard layer of high carbon, and the core still retains the original composition.

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Do you have any other questions?

Nitriding treatment. It refers to a chemical heat treatment process that allows nitrogen atoms to penetrate into the surface of the workpiece in a certain medium at a certain temperature.

Purpose: To increase the wear resistance, surface hardness, fatigue limit and corrosion resistance of steel.

Alloy steels containing a certain amount of alloying elements such as CR, MO, V, or AL. See Nitriding Steel. Nitriding is commonly used to improve hardness, wear resistance, corrosion resistance, etc.

The temperature is generally very low (350-750 degrees), there is no phase change, and the deformation is low, but due to the infiltration of nitrogen, nitriding is generally slightly "fat".

1.The nitriding layer has higher hardness and wear resistance;

2.The nitriding layer has a certain corrosion resistance;

3.The deformation of the workpiece is small after nitriding;

4.Because the permeable layer is thin, the impact should not be too large.

Nitriding technology is divided into light nitriding, liquid nitriding, ion nitriding and gas nitriding, adopted in recent years, light nitriding is the majority, the latest process, because his hardness can reach 1200HV, the depth can be very deep and uniform, the most important thing is no deformation, friction resistance and corrosion resistance without magnetism.

How can you say that salt baths can't be compared? The compounds formed are much more resistant to abrasion and much more resistant to salt spray.

Nitriding treatment refers to a chemical heat treatment process that makes nitrogen acorn penetrate into the surface of the workpiece in a certain medium at a certain temperature, and the products treated by nitriding have excellent wear resistance, fatigue resistance, corrosion resistance and high temperature wear resistance, among which aluminum is the strongest nitride element, generally speaking, if the steel contains one or more nitride elements, the effect after nitriding is relatively good, and the nitriding treatment can increase the wear resistance, surface hardness, fatigue limit and corrosion resistance of the steel.