Process for preparing low-alloy wear-resistant steel without high temperature heat treatment

Abstract

This invention is high temperature heat treatment low alloy antifriction cast steel preparation technique. It is a low energy consumption, high mechanical properties low alloy antifriction cast steel. Tiny or few elements added in the alloy batching can make heat treatment C curve shift right liquid steel qualified is added into casting mold to control solidification temperature of casting, casting is taken out from casting mold when the temperature is down to certain value and quenched in water. It is taken out from water when temperature is down below 1000C, and back fire at 00~3000C. High temperature heat treatment is removed in this invention, so a great deal of electric energy or fuel can be saved and high temperature heat treatment can be eliminated. Working condition can be improved, oxidation and burning loss of alloy material during heat treatment is avoided. Production cycle of casting is shortened, labor productivity is highly improved. metal material loss can be reduced, and environmental pollution by heat treatment is reduced.

Description

Technical field:

[0001] The invention relates to a new heat treatment process for alloy materials, which is suitable for the production of low-alloy wear-resistant cast steel. Background technique:

[0002] Prior to this, the heat treatment process of low-alloy wear-resistant cast steel was: heating the casting to a high temperature (850-1050°C, depending on the type of alloy), and holding it for a certain period of time (generally 1-6 hours, depending on the wall thickness of the casting) Set) and then quenched into oil or water, and finally tempered at low temperature (200-300°C). It can be seen from the above heat treatment process that the high temperature heat treatment of alloy materials takes a lot of energy and labor, and greatly shortens the service life of equipment and increases the oxidation of metal surfaces. Therefore, the cost of heat treatment of alloy materials generally accounts for 20-20% of the total cost of castings. 35%. As we all know, casting and he...

Examples

Embodiment Construction

[0010] The specific steps of the preparation process of the high-temperature heat treatment-free low-alloy wear-resistant cast steel of the present invention are as follows:

[0011] (a) Inject molten steel qualified for smelting into the mold to control the solidification temperature of the casting; the molten steel qualified for smelting contains elements that can greatly shift the heat treatment C curve to the right, and the trace or small amount of elements is boron or titanium or vanadium Or one or more of them; the addition of trace or small amount of elements accounts for the weight percentage of molten steel: the addition of boron is at 0.003-0.004%, the addition of titanium is at 0.2-0.4%, and the addition of vanadium is at 0.2-0.6%.

[0012] (b) When the temperature of the casting drops to 900-850°C, take the casting out of the mold and quench it into water. Depending on the wall thickness of the casting and the cooling rate of the mold, it is most appropriate to co...

Technical field:

[0001] The invention relates to a new heat treatment process for alloy materials, which is suitable for the production of low-alloy wear-resistant cast steel. Background technique:

[0002] Prior to this, the heat treatment process of low-alloy wear-resistant cast steel was: heating the casting to a high temperature (850-1050°C, depending on the type of alloy), and holding it for a certain period of time (generally 1-6 hours, depending on the wall thickness of the casting) Set) and then quenched into oil or water, and finally tempered at low temperature (200-300°C). It can be seen from the above heat treatment process that the high temperature heat treatment of alloy materials takes a lot of energy and labor, and greatly shortens the service life of equipment and increases the oxidation of metal surfaces. Therefore, the cost of heat treatment of alloy materials generally accounts for 20-20% of the total cost of castings. 35%. As we all know, casting and he...

Examples

Embodiment Construction

[0010] The specific steps of the preparation process of the high-temperature heat treatment-free low-alloy wear-resistant cast steel of the present invention are as follows:

[0011] (a) Inject molten steel qualified for smelting into the mold to control the solidification temperature of the casting; the molten steel qualified for smelting contains elements that can greatly shift the heat treatment C curve to the right, and the trace or small amount of elements is boron or titanium or vanadium Or one or more of them; the addition of trace or small amount of elements accounts for the weight percentage of molten steel: the addition of boron is at 0.003-0.004%, the addition of titanium is at 0.2-0.4%, and the addition of vanadium is at 0.2-0.6%.

[0012] (b) When the temperature of the casting drops to 900-850°C, take the casting out of the mold and quench it into water. Depending on the wall thickness of the casting and the cooling rate of the mold, it is most appropriate to co...