Low temperature ion hardening treatment device of austenitic stainless steel long and thin tube

Abstract

The invention discloses a low temperature ion hardening treatment device of an austenitic stainless steel long and thin tube. The technical scheme of the low temperature ion hardening treatment device lies in that stainless steel tubes (10) to be treated are hung on a cathode disc (4) in a furnace; the cathode disc is connected to the negative pole of a DC power supply (2); the positive pole of the DC power supply is connected to a furnace shell, and ground protection is performed; a stainless steel tube (5) in which n+1 (n is the number of outer auxiliary heating areas) armored thermocouples is inserted is further hung on the cathode disc; the output ends of the armored thermocouples are connected with temperature control instruments (8) after being connected to a isolation amplifier (1); one of the thermocouples is inserted in the middle of the stainless steel tube (5) and used for adjusting the output power of the DC glow discharge power supply; the insertion depth of the rest of the n thermocouples is the same as the height of the outer auxiliary heating areas; the thermocouples, outer auxiliary heaters (7) outside the furnace shell (6), outer air coolers (9) and the temperature control instruments (8) form a temperature closed-loop control system; by controlling the temperature of the furnace wall, the stainless steel tubes in the furnace can be in good consistency in axial temperature.

Description

technical field [0001] The invention belongs to a metal material surface ion chemical heat treatment device, more specifically it is a low-temperature ion hardening treatment device for austenitic stainless steel slender tubes. Background technique [0002] Austenitic stainless steel has good corrosion resistance and is widely used in petroleum, chemical, pharmaceutical, food and other industries. However, due to the low hardness (~230HV) and poor wear resistance of austenitic stainless steel, it is difficult for mechanical parts made of austenitic stainless steel, especially some parts that need wear resistance, to meet the requirements of use, which greatly reduces these requirements. Mechanical performance and service life of mechanical parts. [0003] In order to improve the hardness and wear resistance of the surface of austenitic stainless steel, the traditional method is to carry out ion nitriding at a temperature of ~550°C to form a hardened layer containing CrN on ...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a hot wall ion chemical heat treatment device with external auxiliary heating function, which is used for low-temperature ion hardening treatment on the surface of austenitic stainless steel slender tubes. The problem of poor temperature uniformity in the axial and radial directions of the pipe, improve the quality of the low-temperature hardened layer on the surface of the stainless steel pipe, and will not pollute the equipment and the environment during the processing

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