Technique method of treatment for modifying surface of ferrous material

A technology of iron and steel materials and processing technology, which is applied in the direction of metal material coating technology, coating, solid diffusion coating, etc., and can solve problems such as environmental pollution, slow cooling rate, and reduced production efficiency

Inactive Publication Date: 2007-10-10
上海上大热处理有限公司
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Problems solved by technology

The salt bath composite treatment method is restricted by the quality requirements of the salt used. If the quality of the nitride salt does not meet the requirements, it will cause the defect of poor stability of the seepage layer, and there are also environmental pollution problems.
As for the hard chromium plating method on the surface, it will cause environmental pollution, and the country has expressly stipulated that the use of Cr 6+
[0003] There are nitriding and post-oxidation technologies in foreign countries. For example, the German IVA company has manufactured a joint equipment that combines nitriding and oxidation processes; The efficiency is reduced, and it causes the precipitation of the needle-like γ′ phase in the ferrite, which reduces the fatigue resistance of the material

Method used

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  • Technique method of treatment for modifying surface of ferrous material

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Embodiment 1

[0015] In this embodiment, the piston component used in the automobile brake system is used as the test object, and the piston is made of 10# steel material.

[0016] The processing steps of piston steel surface are as follows:

[0017] (1) First, the surface of the piston steel is vacuum cleaned, and then placed in a furnace for pre-oxidation at a temperature of 400°C. Pre-oxidation can form a layer of Fe on the surface of the workpiece 3 o 4 , It is beneficial to the nitriding process, and it can also play a role in preheating to reduce the deformation of the workpiece.

[0018] (2) Put the piston into the existing Aichelin box-type nitrocarburizing heat treatment furnace (see Figure 1), and input NH into the furnace 3 , N 2 and CO 2 The mixed gas; the volume flow ratio of the mixed gas is: NH 3 :N 2 :CO 2 =50:45:5; heating to a reaction temperature of 560° C., a reaction time of 4 hours, and oil cooling after the reaction.

[0019] (3) Polish the cooled piston part...

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Abstract

This invention relates to a method for surface modification of steel material or steel component by combined treatment of gaseous nitrocarburization and post oxidation. The method comprises: (1) performing vacuum washing of the steel material, and pre-oxidizing at 400 deg.C; (2) placing the steel material in a box-type nitrocarburization heat treatment furnace, introducing mixed gases of NH3, N2 and CO2, reacting at 550-570 deg.C, and cooling with oil; (3) polishing, placing in an oxidation furnace, performing post oxidation with high-temperature steam for 1 h, and polishing to obtain steel material with high wear resistance and high corrosion resistance.

Description

technical field [0001] The invention relates to a process method for modifying the surface of iron and steel materials or iron and steel parts, and belongs to the technical field of metal material surface modification process. Background technique [0002] There are many ways to modify the surface of steel materials or steel parts, the main purpose is to improve the wear resistance and corrosion resistance of the surface of steel materials. Previous treatment technologies include: surface hard chromium plating method, salt bath composite treatment method, gas nitriding method, carburizing method, oxidation method, etc. The salt bath compound treatment method is to treat steel workpieces in two kinds of salt baths, the nitride salt bath and the oxide salt bath, and realize the compound of the nitriding process and the oxidation process, and the structure of the nitrided layer is a compound of nitrides and oxides. The salt bath composite treatment method is restricted by the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/08C23C8/10C23C8/32C23C8/02C23C8/80
Inventor 顾晓文翁韶蓉陈莹
Owner 上海上大热处理有限公司
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