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Low-temperature carburization method of stainless steel

A low-temperature carburizing and stainless steel technology, applied in coatings, metal material coating processes, solid-state diffusion coatings, etc., can solve problems such as safety concerns, high prices, and difficulty in reducing manufacturing costs, and achieve the effect of improving safety.

Active Publication Date: 2012-09-19
SUZHOU ZHONGYAO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The main purpose of the present invention is to solve the problem of safety concerns in the existing low-temperature carburizing method of stainless steel due to the use of halide-containing gas or salt bath, and the problem that the high price makes it difficult to reduce the manufacturing cost

Method used

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  • Low-temperature carburization method of stainless steel
  • Low-temperature carburization method of stainless steel
  • Low-temperature carburization method of stainless steel

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0042] This experimental example uses a stainless steel workpiece 10a of composition 1, which is first placed in a vacuum furnace at a temperature of 1350° C. for 2 hours, then the stainless steel workpiece 10a is taken out from the vacuum furnace and put into a carburizing furnace, and passed through Carbon monoxide gas and carburized at 500°C for 24 hours, its microstructure is as follows image 3 As shown, it can be seen that a carburized layer 11a with a thickness of about 41 μm is formed on the surface of the stainless steel workpiece 10a. The surface hardness of this experimental example is about HV 805, and the core hardness is about HV 122. The corrosion resistance is qualified and passed the salt spray test. Can withstand 72 hours.

experiment example 2

[0044] In this experimental example, a stainless steel workpiece of composition 2 was first placed in a vacuum furnace at a temperature of 1350°C for 2 hours, then the stainless steel workpiece was taken out from the vacuum furnace and placed in a carburizing furnace, and carbon monoxide gas was passed through it. And carburized at 500°C for 24 hours, a carburized layer with a thickness of about 40 μm can be formed on the surface of the stainless steel workpiece. The surface hardness of this experimental example is about HV 800, and the core hardness is about HV 120. The corrosion resistance is qualified and Can withstand 68 hours in the salt spray test.

experiment example 3

[0046] In this experimental example, a stainless steel workpiece of composition 1 was first placed in a vacuum furnace at a temperature of 1280°C for 2 hours, then the stainless steel workpiece was taken out from the vacuum furnace and placed in a carburizing furnace, and carbon monoxide gas was passed through it. And carburized at 500°C for 24 hours, a carburized layer with a thickness of about 39 μm can be formed on the surface of the stainless steel workpiece. The surface hardness of this experimental example is about HV 806, and the core hardness is about HV 122. The corrosion resistance is qualified and Can withstand 72 hours in the salt spray test.

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Abstract

The invention provides a low-temperature carburization method of a stainless steel. The method comprises the following steps: firstly, providing stainless steel material, placing the stainless steel material in reducing environment without halogen, and keeping the stainless steel material at a first temperature between 1050 DEG C and 1400 DEG C; secondly, placing the stainless steel material into carbon-containing atmosphere, and keeping the stainless steel material at a second temperature of lower than 600 DEG C so as to enable the carbon to enter the surface of the stainless steel material to form a carburization layer. Halide-containing gas does not need to be used, and the stainless steel material is activated, so that manufacturing cost is lowered, the safety during carbonization treatment is improved, and the environment is free from pollution of the halide.

Description

technical field [0001] The invention relates to a low-temperature carburizing method for stainless steel, in particular to a method for infiltrating carbon element into the surface of stainless steel at low temperature to achieve high hardness without using halide-containing gas for heat treatment. Background technique [0002] Stainless steel can be mainly divided into Austenite stainless steel, Martensite stainless steel and Ferrite stainless steel according to its structure. It is suitable as a structure due to its excellent anti-corrosion properties Parts or appearance parts that require decorative effects, such as screws, nuts, pivots, bolts and other workpieces; or such as watches, mobile phones and other electronic products, accessories, housings of household appliances, etc. However, the surface mechanical properties of general stainless steel cannot meet the needs of practical applications. For example, the common American iron and steel institute (AISI) 316L stainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/22
Inventor 黄坤祥郑礼辉陆永忠
Owner SUZHOU ZHONGYAO TECH CO LTD
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