Industrial Heat Treatment Furnace Improve Corrosion Resistance Of Stainless Steel

Working principle

The stainless steel workpiece is heated to a certain temperature, so that the alloying elements are fully dissolved in austenite, forming a uniform solid solution, and then quickly cooled to inhibit the precipitation of the second phase such as carbide, so as to obtain a susaturated single-phase austenite structure, in order to improve the corrosion resistance and toughness of stainless steel.

Structure Composition

• Heating system: common resistance heating, gas heating and induction heating and so on. Such as resistance heating through the resistance wire heating, the electrical energy into heat; Gas heating generates heat from gas combustion through gas burner; Induction heating uses the principle of electromagnetic induction to generate eddy currents in the workpiece, which in turn heats the workpiece itself.
• thermal insulation system: The use of high-quality thermal insulation materials, such as ceramic fiber, rock wool, etc., to reduce heat loss, maintain the stability of the temperature in the furnace, to ensure the smooth process of solution treatment.
• Cooling system: Generally water cooling or air cooling. Water cooling system by circulating water to take away heat, to achieve rapid cooling; The air cooling system cools the workpiece by blowing cold air into the furnace through the fan, which can also be applied to some stainless steel solution treatment with relatively low cooling speed.
• Temperature control system: composed of temperature sensor, controller, etc., real-time monitoring of the temperature in the furnace, and the temperature signal feedback to the controller, the controller according to the set temperature value automatically adjust the power of the heating element or gas flow, to ensure that the temperature in the furnace is controlled within the specified range, to ensure the consistency of solution treatment effect.
• Furnace structure: usually adopts well-sealed steel structure, lined with refractory materials to withstand high temperature and protect the furnace body. The furnace door is provided with a sealing device to prevent air from entering the furnace and avoid oxidation of stainless steel during solution treatment.

Technical parameters

• Temperature range: generally can reach 1000-1200℃ or so, to meet the needs of different types of stainless steel solution treatment temperature, for example, some austenitic stainless steel solution treatment temperature in 1030-1150℃.
• temperature control accuracy: usually can be controlled in the range of ±1-±5℃, high-precision temperature control can ensure the quality stability of stainless steel solution treatment.
• Heating power: according to the furnace body size and different production needs, the power range is wide, from tens of kilowatts to hundreds of kilowatts.
• Furnace size: can be customized according to actual production needs, as small as the laboratory for tens of centimeters × tens of centimeters of small furnace body, to the industrial production of several meters × several meters of large furnace body are available.
• Cooling speed: under the water-cooled method, the cooling speed can cool the workpiece from the solution temperature to room temperature in a few minutes, and the cooling speed of the air-cooled method is relatively slow, but it can also meet the cooling requirements of some specific stainless steel materials.

Performance Characteristics

• Fast heating and cooling: the stainless steel workpiece can be heated to the solution temperature in a short time, and cooled quickly after the end of insulation, improve production efficiency, while ensuring the solution treatment effect, and obtain good organization and performance.
• high temperature uniformity: The use of advanced heating technology and circulation system, so that the temperature uniformity of each point in the furnace is good, to ensure that all parts of the workpiece can be uniform solution treatment, to avoid performance differences caused by uneven temperature.
• Atmosphere control function: some high-end stainless steel fast solution furnaces have atmosphere control function, which can pass inert gas or reducing gas, such as nitrogen, argon, hydrogen, etc., to protect the surface of the workpiece during the solution treatment process, prevent oxidation and decarbonization, and improve the surface quality of the workpiece.
• high degree of automation: equipped with PLC control system and man-machine interface, it can realize automatic control of solution treatment process, including heating, insulation, cooling and other aspects of parameter setting, adjustment and monitoring, reduce manual operation errors, improve the stability and reliability of the production process.

Application Field

• Aerospace field: used to treat the stainless steel materials used in key parts such as aircraft engine blades and landing gear, improve their strength, corrosion resistance and high temperature resistance, and ensure the safe and reliable operation of aerospace equipment.
• Medical device field: solid solution treatment of stainless steel used in the manufacture of medical devices such as scalpels, dental instruments, implants, etc., to improve its corrosion resistance and biocompatibility, and ensure the quality and safety of medical devices.
• Electronic and electrical fields: processing of stainless steel parts in electronic equipment, such as electronic component shells, radiators, etc., to improve their corrosion resistance and electrical conductivity, to ensure the stable performance of electronic and electrical products.
• Architectural decoration field: used to treat stainless steel plates and pipes for architectural decoration, improve its corrosion resistance and surface gloss, extend its service life, and enhance the aesthetic effect of architectural decoration.

Technical parameter