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A kind of medium and low carbon molten steel-sand quenching medium and its quenching process

A quenching medium, low carbon steel technology, applied in the direction of quenching agent, manufacturing tools, heat treatment equipment, etc., can solve the problems of easy fire, easy rusting of workpieces, polluted land, etc., to prevent deformation or even cracking, short holding time, Energy saving effect

Inactive Publication Date: 2018-01-12
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the quenching oil pollutes the surrounding environment greatly, and it is easy to cause a fire during quenching
The salt water or alkaline water quenching medium can destroy the steam film, but the salt is corrosive, and the workpieces quenched by salt water or alkaline water are easy to rust. Secondly, industrial salt or alkali is harmful to the human body and pollutes the land. When quenching fluid, other chemicals or related industrial equipment are required

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Use water-sand quenching medium to quench medium and low carbon, and the specific operation includes the following steps:

[0023] (1) Prepare water-sand quenching medium: the water-sand quenching medium is composed of 1500ml water and 1000g river sand, wherein the particle size of river sand is 30-40 mesh;

[0024] (2) Put 200g of medium and low carbon steel workpieces into the heating furnace, heat to 860°C, and keep warm for 20min;

[0025] (3) Then the workpiece of medium and low carbon steel is put into the water-sand quenching medium, stirred at a constant speed and fully for about 3-5s, cooled to 180-220°C, and self-tempered at room temperature.

[0026] The low-carbon steel workpiece after self-tempering at room temperature in this embodiment was first polished off the oxide film and carbon peeling on the surface with sandpaper, and then the hardness test was carried out with a Rockwell hardness tester. The test results are shown in Table 1.

Embodiment 2

[0028] Use water-sand quenching medium to quench medium and low carbon, and the specific operation includes the following steps:

[0029] (1) Prepare water-sand quenching medium: water-sand quenching medium is made up of the pure water of 1100ml and the sea sand of 1000g, wherein the particle size of sea sand is 30-40 order;

[0030] (2) Put 150g of medium and low carbon steel workpieces into the heating furnace, heat to 860°C, and keep warm for 10min;

[0031] (3) Then put the medium and low carbon steel into the water-sand quenching medium, stir at a constant speed and fully for 3-5s, cool to 180-220°C, and self-temper at room temperature.

[0032] The medium and low carbon steel workpiece after self-tempering at room temperature in this embodiment was first polished off the oxide film and carbon peeling on the surface with sandpaper, and then the hardness test was carried out with a Rockwell hardness tester. The test results are shown in Table 1.

Embodiment 3

[0034] Use water-sand quenching medium to quench medium and low carbon, and the specific operation includes the following steps:

[0035] (1) Preparation of water-sand quenching medium: the water-sand quenching medium is composed of 1600ml of pure water and 1000g of mountain sand, wherein the particle size of the mountain sand is 30-40 mesh;

[0036] (2) Heat 200g of medium and low carbon steel to 780°C and keep it warm for 20min;

[0037] (3) Then put the medium and low carbon steel into the water-sand quenching medium, stir at a constant speed and fully for 3-5s, then cool to a temperature of 180-220°C, and self-temper at room temperature.

[0038] The medium-low carbon steel workpiece after self-tempering at room temperature in this embodiment was first polished off the oxide film and carbon peeling on the surface with sandpaper, and then the hardness test was carried out with a Rockwell hardness tester. The test results are shown in Table 1.

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Abstract

The invention belongs to the technical field of metal heat treatment, and in particular relates to a medium-low carbon molten steel-sand quenching medium and a quenching process thereof. The medium-low carbon molten steel-sand quenching medium is composed of water and fine sand according to the mass ratio of 1.1:1-1.6:1. The quenching process is: heating the medium-low carbon steel to 780-860°C and keeping it warm for 10min- 20min, then put the medium and low carbon steel into the water-sand quenching medium, uniform speed, full stirring, quenching and cooling, and self-tempering at room temperature. Adopting the water-sand quenching medium of the present invention to carry out the quenching process of medium and low carbon steel can effectively prevent the occurrence of quenching soft spots and improve the hardness; effectively remove the steam film formed by the vaporization of water at high temperature, during the quenching process Different temperature areas, control the cooling rate, prevent deformation or cracking of the workpiece. The water-sand quenching medium of the present invention is easy to obtain and cheap; the quenching and heat preservation time is shorter, and has the characteristics of energy saving, economy and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of metal heat treatment, and in particular relates to a medium-low carbon molten steel-sand quenching medium and a quenching process thereof. Background technique [0002] The quenching medium is an important guarantee for the implementation of the quenching process, and has a great influence on the workpiece after heat treatment of metal materials. At present, the quenching medium mainly includes water, oil, saline and so on. Water is the earliest, most widely used, and most economical quenching medium. It is cheap and easy to obtain, non-toxic, non-combustible, stable in physical and chemical properties, and strong in cooling capacity. By controlling the temperature of the water, increasing the pressure, increasing the flow rate, using circulating water, and using the magnetic field, etc., the cooling characteristics of the water can be improved, deformation and cracking can be reduced, and an ideal quench...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/56C21D1/18
Inventor 郑卫刚白洋何延康
Owner WUHAN UNIV OF TECH
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