What materials are used for carburizing furnace filling? Thank you

12Cr16Ni35(1Cr16Ni35), N08330, Ra330, austenitic heat-resistant steel.

Introduction to 1CR16Ni35 steel grade.

1CR16Ni35 is a heat-resistant stainless steel with good oxidation resistance and corrosion resistance, and is often used as furnace parts, nozzles, combustion chambers, etc.

Grade: 1Cr16Ni35

Standard: GB T 1221-1992

Metallographic structure: The structure is characterized by austenite type.

1Cr16Ni35 characteristics and scope of application.

1Cr16Ni35 heat-resistant steel is a steel grade with carburizing resistance and nitriding ability, because of its high chromium and nickel content, it has high temperature creep strength, can continue to work at high temperatures, has good high temperature resistance, and can be repeatedly heated below 1035 for oxidation resistance. 1Cr16Ni35 heat-resistant steel can be used as furnace steel, petroleum cracking unit, etc.

1Cr16Ni35 Specification for Heat Treatment.

Solution 1030 1180 fast cooling.

1CR16NI35 Specifications:

Round bars, bars, strips, tubes, seats, balls, flanges and forgings are negotiated**.

<>1Cr16Ni35 heat-resistant stainless steel has a close relationship with the progress of energy and power machinery, and can be used in thermal power generation, atomic energy, aerospace, aviation, petroleum and chemical industry and other fields. Recently, 1Cr16Ni35 heat-resistant stainless steel has been gradually applied to automobile emission system engineering. With the adjustment of automobile exhaust emission regulations, the performance of automobile engine is improved, the exhaust gas temperature is getting higher and higher, and the exhaust temperature is increased from the current 900 950 to 1000 1050, which puts forward higher requirements for stainless steel at the high temperature end of the exhaust system, especially with high temperature strength, high temperature oxidation resistance and good formability.

1Cr16Ni35 Considering the limited weldability, formability and high-temperature strength of ferritic stainless steel, some European cars choose S and 310 austenitic heat-resistant steel to make high-temperature parts. and 309S is relatively weak in resistance to high-temperature oxidation, and has not achieved satisfactory results when used, and 310S ** is expensive, which greatly increases the production cost.

Good corrosion resistance, especially in oxidation, carbonization and nitriding environments. The high nickel content gives the material a high resistance to chloride stress corrosion, cracking, and phase precipitation embrittlement.

The oxidation resistance temperature is as high as 1095, and the anti-scaling ability is very good at high temperature. Any oxide scale is formed and adheres tightly to the surface of the material, even under alternating heating and cooling cycles.

High nickel and a certain amount of silicon give the material excellent resistance to carburizing. In the alternating environment of carburizing and oxidation, 330 exhibits excellent resistance to "green corrosion".

330 is specially used for anti-oxidation and carburizing in high-temperature environments, especially suitable for corrosion resistance in the environment where cyclic temperature heating and carburizing are combined. It is often used to manufacture various industrial furnace parts, various heat treatment and petroleum cracking equipment parts, etc.

1. Grade RA330 austenitic heat-resistant alloy.

Two: chemical composition.

Carbon C: Silicon Si: Manganese Mn: Sulfur S: Phosphorus P:

Chromium Cr: Nickel Ni:

Three: the scope of application, the field of application:

Carburizing, carbonitriding, malleable annealing and other furnace bodies. Retort furnaces, muffle furnaces and heat treatment fixtures and baskets. Fixtures and baskets. Quenching fixtures. Radiant tubes. Neutral salt bath oven tank. High-temperature fans and shafts in industrial furnaces.

Conveyor belt. Hot press press plate. **Heater and steam boiler hanger racks.

Four: physical properties.

Tensile Strength b (MPa): 560 Conditional Yield Strength MPa): 205 Elongation δ5 (%40

Section shrinkage 50 Hardness: 201HB Heat Treatment Specification Solution 1030 1180 Quick cooling.

Five: Overview. RA330 alloy has excellent resistance to chloride stress corrosion cracking. When it comes to engineering material selection, RA330 is a good choice if conventional stainless steel suffers from stress corrosion, especially at high temperatures.

RA330 alloy is a classic high-performance high-temperature resistant alloy. By adding silicon elements, it has good high temperature strength, and still has good carbonization resistance and oxidation resistance to 1200. At the same time, RA330 is specifically designed to withstand the thermal shock of quenching.

High-temperature alloy materials can be considered, and RA330 is recommended, which is a more suitable material.

Carburizing furnace tanks are also known as muffle tanks.

with heat-resistant steel (1Cr16Ni, Cr25Ni20, etc.).

The carburizing furnace is a new type of energy-saving periodic operation heat treatment electric furnace, which is mainly used for gas carburizing of steel parts. Due to the selection of ultra-light energy-saving furnace lining material (ceramic fiber) and advanced sealing fan for integrated water-cooled furnace, this series of carburizing furnace has uniform temperature, fast heating, good heat preservation, accelerated carburizing speed of the workpiece, uniform carbon potential atmosphere, uniform permeability, and no leakage when the furnace pressure is increased, which improves the production efficiency and carburizing quality. Structure:

This series of carburizing furnace is composed of furnace shell, furnace lining, furnace cover lifting mechanism, furnace sealing fan, muffle tank, heating element and electronic control system. The furnace shell is welded from steel plates and section steel. The furnace lining is an energy-saving composite structure made of high-strength ultra-light energy-saving refractory bricks, aluminum silicate fibers, diatomaceous earth insulation bricks and asbestos boards.

The lid lifting mechanism is composed of motors, gear pumps and other components, when the lid is opened, just press the button on the control box, and the lid will rise at a speed of 30-70 mm per second. For the sake of safety, two travel switches are installed on the lifting shaft, when the furnace cover rises, the lower travel switch automatically cuts off the main circuit power supply of the carburizing furnace control cabinet, makes the heating element power off and stops working, and the upper travel switch then limits the height of the lifting shaft to rise, in order to prevent the lifting and pumping from being too high and falling out.

The furnace is equipped with a sealed fan on the furnace lid to stir the atmosphere in the muffle tank and make its composition uniform, and at the same time make the furnace temperature tend to be uniform. Also be equipped with three process pipes on the furnace lid to lead to the furnace muffle tank: a casing top is installed with a three-head stainless steel injector, by the three-head injector to the furnace to drip methanol, kerosene or other organic liquids, all kinds of liquids can be adjusted, the ammonia gas hole on this casing can be used to transport ammonia to the furnace for carbon, nitrogenization (this nozzle can be closed when not nitriding); A casing is a sampling pipe, and a pipe joint at the upper part of the casing can be connected with a "U" type glass tube pressure gauge, which is used to monitor the furnace muffle tank The function of the furnace muffle tank is to maintain the furnace pressure and ensure the normal progress of carburizing or carbon and nitriding, and it is made of heat-resistant steel (casting).

The heating element is wound into a spiral by the electric heating alloy wire, is installed on the inner wall of the furnace lining, and leads out of the furnace by leading out, and the temperature of the carburizing furnace is transmitted to the automatic temperature control cabinet by the thermocouple inserted into the furnace, and the temperature control cabinet automatically controls, adjusts and records the heating temperature in the furnace. The carburizing furnace is equipped with a cooling drum (optional) to store the processed parts, and a sand seal on the lid of the barrel.

Because the outside of the carburizing furnace tank is close to the electric heating element, the temperature is high, up to 950-l000 degrees, so the furnace tank is required to have good oxidation resistance; The inside of the furnace tank is in a carburizing atmosphere, which requires the Shanghai tank to have good carburizing resistance. At the same time, due to the large load of the furnace tank, the furnace tank is also required to have high high temperature strength. The surface of the outside of the furnace tank is oxidized and peeled, which will lead to cracking, and the main form of failure is the leakage of the furnace tank.

Casting defects have a great impact on the service life of the furnace tank, and there are often more opportunities for oxidation and cracking at the defects. After the furnace tank is slightly cracked, it is quickly damaged after repair welding, which is mainly due to the deterioration of welding performance after oxidation and carburizing. Annular cracks sometimes occur below the mouth of the tank, which is related to the structure of the tank and the complex stress situation in the area.

From the structure, it can be seen that the annular cracking area is the transition zone between the high temperature zone in the tank and the low temperature zone of the upper tank mouth part. The force is larger. In addition, this area is precisely at the part where the bottom of the sealing ring of the furnace and tank mouth is connected with the tank wall, is in the cross-sectional change part, due to the thermal stress and the load should be.

The force is superimposed, and the bottom of the sealing ring is the supporting point of the whole furnace, where the stress is the greatest during operation. In addition, it is the hot joint part of the casting, and there is a high possibility of casting defects, so there is an annular crack perpendicular to the stress. Comparison of the service life of furnace tanks, CR18Ni25Si2

The furnace tank service life of CR25Ni20 steel is the highest, which is more than 3 times that of the CR18Mn12Si2N steel furnace tank.