Low-pressure vacuum carbonizing heat treatment method of high-temperature carburized stainless steel

Abstract

The invention relates to a low-pressure vacuum carbonizing heat treatment method of high-temperature carburized stainless steel. The method comprises the treatment steps of low-pressure vacuum carbonizing, quenching, deep cooling and high-temperature tempering; and the steps can be repeatedly performed. The low-pressure vacuum carbonizing process uses a saturated value adjusting method for multi-section pulse carbonizing; a carbonizing agent adopts acetylene gas; the carbonizing temperature is 850-1050 DEG C; the carbonizing pressure is 100-2000 Pa; and the powerful seepage and dispersion circulating period is 20-70 times. The treatment method is safe, energy-saved and environment-friendly, can eliminate intergranular oxidation, realizes precise control of the seepage layer depth, and canguarantee excellent service performances of prepared materials above 400 DEG C.

Description

technical field [0001] The invention relates to a high-temperature carburizing stainless steel low-pressure vacuum carburizing heat treatment method, belonging to the technical field of metal material heat treatment. Background technique [0002] The carburizing treatment is carried out by using the traditional well chamber carburizing furnace and atmosphere carburizing furnace, the carburizing process is difficult to control accurately, the carburizing temperature is low, the carburizing time is long, the energy consumption is large, the oxidation in the carburized layer is serious, and the carbides in the carburized layer The size and uniformity of distribution are poor, and it is difficult to uniformly carburize components with complex shapes, and network carbides are produced during long-term carburization, which reduces the performance of steel. [0003] The Chinese patent application whose publication number is CN103556106A "a kind of preparation method of high-tempera...

AI Technical Summary

Problems solved by technology

[0002] The carburizing treatment is carried out by using the traditional well chamber carburizing furnace and atmosphere carburizing furnace, the carburizing process is difficult to control accurately, the carburizing temperature is low, the carburizing time is long, the energy consumption is large, the oxidation in the carburized layer is serious, and the carbides in the carburized layer The size and uniformity of distribution are poor, and it is difficult to uniformly carburize components with complex shapes, and network carbides are produced during long-term carburization, which reduces the performance of steel

[0003] The Chinese patent application whose publication number is CN103556106A "a kind of preparation method of high-temperature vacuum carburizing layer of 1Cr17Ni2 alloy material", the Chinese patent application whose publication number is CN107829064A "a kind of vacuum carburizing heat treatment process of 12CrNi3A material", and the Chinese patent application whose publication number is CN102899603A Many patents such as the Chinese patent application "M50NiL material low-pressure vacuum carburizing method" involve a low-pressure vacuum carburizing process control method, but the above-mentioned methods are all aimed at different carburizing materials, and the high-temperature carburizing stainless steel material proposed by the present invention and the above-mentioned The materials are different alloy composition systems, containing high content of Cr, Co, Mo, V, W and other elements, the composition system and heat treatment process are more complicated, and the control accuracy of the infiltration layer is difficult, the hardness performance requirements and the service temperature of the material are higher. Therefore, the content of the above-mentioned patent application does not apply to the content of the present invention

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