Production process of high-strength alloyed gray iron hydraulic valve body part

A high-strength alloy and production process technology, which is applied in the improvement of process efficiency, electric furnace, furnace, etc., can solve the problems that the hardness cannot meet the requirements of hydraulic parts and the general cost of gray cast iron, so as to increase the carbon content and solve the problem of low hardness in thick and large sections , Improve the effect of tensile strength

Active Publication Date: 2016-03-16
西峡飞龙特种铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of the gray cast iron of this invention is average and its strength is high, but its hardness still cannot meet the requirements of hydraulic parts

Method used

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  • Production process of high-strength alloyed gray iron hydraulic valve body part

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This embodiment provides a high-strength alloy gray cast iron hydraulic valve body production process, the production process is:

[0028] 1) Add steel scrap, pig iron, furnace charge and recarburizer into the intermediate frequency induction furnace, and turn on the furnace for smelting;

[0029] 2) After the material in the furnace is melted, add alloy particles and control the temperature within the range of 1560-1600°C and continue heating for 4-8 minutes. The alloy particles include three elements: copper, chromium and tin;

[0030] 3) Obtain molten iron from the electric furnace through a sampling spoon, and detect the content of each element in the molten iron through a metal element analyzer. If the composition is unqualified, keep heating and add missing elements for adjustment. If the composition is qualified, the molten iron is left to wait. cool down;

[0031] 4) Slag removal and pouring are carried out after the temperature of the molten iron is lowered, a...

Embodiment 2

[0041] This embodiment provides a high-strength alloy gray cast iron hydraulic valve body production process, the production process is:

[0042] 1) Add steel scrap, pig iron, furnace charge and recarburizer into the intermediate frequency induction furnace, and turn on the furnace for smelting;

[0043] 2) After the material in the furnace is melted, add alloy particles and control the temperature within the range of 1560-1600°C and continue heating for 4-8 minutes. The alloy particles include three elements: copper, chromium and tin;

[0044] 3) Obtain molten iron from the electric furnace through a sampling spoon, and detect the content of each element in the molten iron through a metal element analyzer. If the composition is unqualified, keep heating and add missing elements for adjustment. If the composition is qualified, the molten iron is left to wait. cool down;

[0045] 4) Slag removal and pouring are carried out after the temperature of the molten iron is lowered, a...

Embodiment 3

[0055] This embodiment provides a high-strength alloy gray cast iron hydraulic valve body production process, the production process is:

[0056] 1) Add steel scrap, pig iron, furnace charge and recarburizer into the intermediate frequency induction furnace, and turn on the furnace for smelting;

[0057] 2) After the material in the furnace is melted, add alloy particles and control the temperature within the range of 1560-1600°C and continue heating for 4-8 minutes. The alloy particles include three elements: copper, chromium and tin;

[0058] 3) Obtain molten iron from the electric furnace through a sampling spoon, and detect the content of each element in the molten iron through a metal element analyzer. If the composition is unqualified, keep heating and add missing elements for adjustment. If the composition is qualified, the molten iron is left to wait. cool down;

[0059] 4) Slag removal and pouring are carried out after the temperature of the molten iron is lowered, a...

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Abstract

The invention discloses a production process of a high-strength alloyed gray iron hydraulic valve body part. The production process comprises the following steps: adding a scrap steel, a pig iron, foundry returns and a carburant to a medium-frequency induction furnace and turning on the furnace for smelting; after the materials in the furnace are melted down, adding alloy particles and continuing to heat for 4-8 minutes by controlling a temperature within a range of 1560-1600 DEG C, wherein the alloy particles comprise three elements, namely copper, chromium and tin; taking liquid iron from the furnace by using a sampling spoon, and detecting the content of each element in the liquid iron through a metal element analyzer; carrying out drossing and pouring after the liquid iron is cooled, keeping a pouring temperature within the range of 1320-1360 DEG C and pouring the liquid iron into a cavity of the hydraulic valve body part; and forming a final casting. According to the production process of the high-strength alloyed gray iron hydraulic valve body part, the brand-new alloy is added, such that the content of a pearlite can be increased and the graphite can be refined; as a result, the problems of thick and large section and low hardness, and low pearlite content of the hydraulic part are effectively solved, and the tensile strength of the hydraulic valve body part and the hardness of the casting are improved.

Description

technical field [0001] The invention relates to the technical field of gray cast iron smelting technology, in particular to a production process of a high-strength alloy gray cast iron hydraulic valve body. Background technique [0002] Gray cast iron refers to cast iron with flake graphite, because the fracture is dark gray when broken, so it is called gray cast iron. The main components are iron, carbon, silicon, manganese, sulfur, and phosphorus. It is the most widely used cast iron, and its output accounts for more than 80% of the total output of cast iron. Gray cast iron is divided into ferrite matrix gray cast iron, pearlite-ferrite matrix gray cast iron, and pearlite matrix gray cast iron. Different gray cast irons can be used according to the different directions of castings to meet the requirements of use. They are generally used in hydraulic parts. Gray cast iron with a pearlitic matrix is ​​required. [0003] The sampling part of the hydraulic parts is close to ...

Claims

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Application Information

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IPC IPC(8): C22C37/10C21C5/52
CPCC21C5/5241C22C37/06C22C37/10Y02P10/20
Inventor 刘松奇曹红磊杜斌李刚余嗣瑞
Owner 西峡飞龙特种铸造有限公司
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