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Carburizing method with high-carbon cast iron melt liquid as carburizing medium

A carburizing agent and cast iron technology, which is applied in the field of carburizing steel surfaces, can solve problems such as unstable performance of solid carburized parts, impact on the service life of carburizing equipment, and large gradients of carbon concentration in the carburized layer. The effect of short carbon time and high production efficiency

Inactive Publication Date: 2009-07-29
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its disadvantage is that there is more carbon black, which has a certain impact on the service life of carburizing equipment.
The industrial application of solid carburizing has not formed a scale, because the performance of solid carburizing parts is not very stable and the carbon concentration gradient of the carburizing layer is large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] (1) Surface treatment of 20 steel samples: surface grinding to 400 # Water sandpaper→alkali washing (boiling with 10% NaOH for 10min)→water washing→acid washing (cleaning with 36%HCl for 5min)→water washing→drying at room temperature.

[0014] (2) Heat and melt the high-carbon cast iron in a well-type resistance furnace, keep it warm at a temperature of 1100 ° C, and pass nitrogen or argon to protect it during the melting process. A small amount of Al is added to the melt for deoxidation, and then the scum on the surface of the melt is removed.

[0015] (3) Immerse the surface-treated sample in (1) into molten cast iron for carburizing, and the immersion time is controlled between 30 and 60 s.

[0016] (4) The sample after carburizing is cooled naturally in still air. In this way, a carburized layer with a depth between 20 and 1000 μm is formed on the surface of the sample.

Embodiment 2

[0018] (1) Surface treatment of 20 steel samples: surface grinding to 400 # Water sandpaper→alkali washing (boiling with 10% NaOH for 10min)→water washing→acid washing (cleaning with 36%HCl for 5min)→water washing→drying at room temperature.

[0019] (2) Heat and melt the high-carbon cast iron in a well-type resistance furnace, keep it warm at a temperature of 1100 ° C, and pass nitrogen or argon to protect it during the melting process. A small amount of Al is added to the melt for deoxidation, and then the scum on the surface of the melt is removed.

[0020] (3) Preheat the sample after the surface treatment in (1). The preheating temperature is between 200°C and 700°C. During the preheating process, nitrogen or argon gas is used to protect the surface to avoid surface oxidation of the sample. Then immerse in molten cast iron for carburizing, and the immersion time is controlled between 10 and 30s.

[0021] (4) The sample after carburizing is cooled naturally in still air....

Embodiment 3

[0023] (1) Surface treatment of 20 steel samples: surface grinding to 400 # Water sandpaper→alkali washing (boiling with 10% NaOH for 10min)→water washing→acid washing (cleaning with 36%HCl for 5min)→water washing→drying at room temperature.

[0024] (2) Heat and melt the high-carbon cast iron in a well-type resistance furnace, keep it warm at 1200°C, and pass nitrogen or argon gas into the melting process for protection. A small amount of Al is added to the melt for deoxidation, and then the scum on the surface of the melt is removed.

[0025] (3) Immerse the surface-treated sample in (1) into molten cast iron for carburizing, and the immersion time is controlled between 30 and 60 s.

[0026] (4) The sample after carburizing is cooled naturally in still air. In this way, a carburized layer with a depth between 20 and 1000 μm is formed on the surface of the sample.

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Abstract

A carburization method using high carbon cast iron solution as carburizer belongs to the technical field of steel surface chemical heat treatment. The invention is characterized in that: low carbon steel and alloy carburizing steel are taken as materials to be carburized, high carbon cast iron is taken as carburizer raw material, wherein, the high carbon cast iron comprises the following components by weight percentage: 5% of Ni, 2% of Cr, 3.1-3.3% of C, 0.8% of Si, 1.5% of B, 0.9% of Mn, the rest being Fe; the melting temperature of high carbon cast iron ranges from 1080 DEG C to 1200 DEG C; the work piece, which is subject to surface treatment and needs to be carburized, is immersed into the high carbon cast iron solution for carburization in the ways of normal temperature and pre-heating, and the carburization lasts 10-60s; after carburization, the work piece is naturally cooled in the static air, and then a carburization layer with the thickness of 20-1000mum can be formed on the surface of the sample. The invention has the advantages of short carburization period, high production efficiency, no internal oxidation of elements in the steel, no deposited carbon on the steel surface, little influence on the service life of the equipment, simple technique, low cost and convenient and simple operation, and is suitable for actual production.

Description

technical field [0001] The invention relates to the technical field of steel surface chemical heat treatment, in particular to a steel surface carburizing method. Background technique [0002] Carburizing is the most familiar and widely used chemical heat treatment process to strengthen the surface of the workpiece, and the current process control level is also very high. For parts such as gears, shafts, piston pins and cams that are subject to heavy loads, wear resistance, impacts and complex stresses, carburizing has become one of the most important surface strengthening methods. [0003] Carburizing methods are mainly divided into gas carburizing and solid carburizing according to different carburizing agents. Among them, gas carburizing is a very common surface strengthening method for mechanical components. The conventional gas carburizing process needs to feed carrier gas and enriched gas into the sealed chamber. A large amount of carrier gas is used to maintain the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/46C23C8/02
Inventor 郭志猛王立生高治山林涛郝俊杰邵慧萍罗骥
Owner UNIV OF SCI & TECH BEIJING
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