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Medium-temperature ageing thermal treatment method for stainless steel and vacuum furnace adopted by medium-temperature ageing thermal treatment method

An aging heat treatment and vacuum furnace technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of damaging the corrosion resistance of products, weak oxidation layer reduction ability, and prone to oxidative discoloration, so as to achieve small equipment changes and avoid chemical The use of pickling solution and the effect of avoiding the pickling section

Inactive Publication Date: 2019-08-23
SHANGHAI FUTURE HIGH-TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the existing vacuum furnace equipment and operating mode, the product will have the problem of oxidative discoloration after medium-temperature aging heat treatment; the oxidative discoloration of the product has a great impact on its appearance and will damage the corrosion resistance of the product
[0003] There are three main reasons for the oxidative discoloration of MIM17-4PH stainless steel in the medium temperature aging treatment. The first is that when the 17-4PH stainless steel material is heated to the medium temperature aging stage, it will be in the range of its "sensitization reaction". At this time, it is easier The phenomenon of oxidative discoloration occurs; the second is that the heat insulation layer material of the vacuum furnace is a loose and porous material, which is easy to absorb water. The water will evaporate into water vapor during the aging heat treatment stage, and the water vapor will oxidize when in contact with the product, making the product Discoloration; the third is that in the middle temperature aging stage, the vacuum atmosphere has a weak reduction ability to the oxide layer on the surface of the material, which is not enough to restore it

Method used

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  • Medium-temperature ageing thermal treatment method for stainless steel and vacuum furnace adopted by medium-temperature ageing thermal treatment method
  • Medium-temperature ageing thermal treatment method for stainless steel and vacuum furnace adopted by medium-temperature ageing thermal treatment method
  • Medium-temperature ageing thermal treatment method for stainless steel and vacuum furnace adopted by medium-temperature ageing thermal treatment method

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Embodiment 1

[0036] combine figure 1 with figure 2 As shown, a vacuum furnace for stainless steel medium-temperature aging heat treatment is preferably used as a vacuum batch furnace. The vacuum batch furnace includes a vacuum vessel 1 arranged as a horizontal cylindrical structure, and a carbon fiber is installed in the vacuum vessel 1. The insulation cylinder 2 made of felt material, the insulation cylinder 2 is also a cylindrical structure, and the insulation cylinder 2 is provided with a heat treatment box 3, and the chamber of the heat treatment box 3 is connected with the chamber of the insulation cylinder 2 Pass. MIM17-4PH stainless steel products are placed on the partition in the heat treatment box 3, and the heating operation is completed through the heating device of the vacuum vessel 1 itself, and an inert gas is introduced into the vacuum vessel 1 to create an inert gas atmosphere or vacuum The air in the container 1 creates a vacuum environment atmosphere to complete the m...

Embodiment 2

[0041] Such as image 3 As shown, a stainless steel medium-temperature aging heat treatment method, first of all, according to the actual situation, choose to carry out the medium-temperature aging heat treatment in the inert gas protection mode, or choose to carry out the medium-temperature aging heat treatment in the vacuum protection mode. When the inert gas protection mode is selected, the inert gas source 5 injects inert gas into the heat treatment box 3, and the vacuum device 4 is opened to draw out the air, inert gas and water vapor in the insulation cylinder 2 and the heat treatment box 3; Vacuum protection mode, close the pipeline valve 71 to cut off the passage of the inert gas source 5 injecting inert gas into the heat treatment box 3, and open the vacuum device 4 to draw out the air and water vapor in the heat preservation cylinder 2 and the heat treatment box 3 .

[0042] The present embodiment will be further elaborated below in conjunction with specific modes: ...

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Abstract

The invention discloses a medium-temperature ageing thermal treatment method for stainless steel and a vacuum furnace adopted by the medium-temperature ageing treatment method, and relates to the technical field of stainless steel thermal treatment. The original vacuum furnace equipment is modified, so that communication positions of an inert gas source, vacuum equipment and a vacuum container arechanged, i.e., the purpose of blocking water steam from entering a thermal treatment box is achieved by virtue of a way of changing an inert gas flow direction to match with a pumping action direction, and therefore, the purpose of solving the problem that medium-temperature ageing thermal treatment of a stainless steel product has oxidization discoloration is achieved.

Description

technical field [0001] The invention relates to the technical field of stainless steel heat treatment, in particular to a stainless steel medium-temperature aging heat treatment method and a vacuum furnace thereof. Background technique [0002] MIM17-4PH stainless steel products (MIM refers to metal injection molding process) undergo medium temperature aging heat treatment (aging treatment at 580-620°C), which can enhance the plasticity and toughness of the material and improve the comprehensive mechanical properties of the material. However, under the existing vacuum furnace equipment and operating mode, the product will have the problem of oxidative discoloration after medium-temperature aging heat treatment; the oxidative discoloration of the product has a great impact on its appearance and will damage the corrosion resistance of the product. [0003] There are three main reasons for the oxidative discoloration of MIM17-4PH stainless steel in the medium temperature aging ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C21D1/773C21D1/74
CPCC21D1/74C21D1/773C21D9/00
Inventor 邓忠勇段满堂陈磊
Owner SHANGHAI FUTURE HIGH-TECH CO LTD
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