Preparation method of high-chromium iron hammerhead

A high-chromium cast iron and hammer head technology is applied in the field of preparation of high-chromium cast iron hammer heads, which can solve the problems that plague the performance of hammer heads, and achieve the effects of improving toughness, reducing brittle fracture tendency and high application value.

Inactive Publication Date: 2018-12-18
ANHUI POLYTECHNIC UNIV MECHANICAL & ELECTRICAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention only changes the process conditions in the casting and solves the problem that has plagued the performance of the hammer head for a long time, and has high application value

Method used

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preparation example Construction

[0012] The present invention provides a kind of preparation method of high chromium cast iron hammer head, and described preparation method comprises the following steps:

[0013] (1) According to the composition ratio of the high chromium cast iron hammer head, the raw materials are added to the induction furnace for melting, and the melting temperature is 1450-1480 °C;

[0014] (2) After all the raw materials are melted, pour them into metal molds at 1350-1420°C, and cool to obtain blanks; wherein, the temperature of the metal molds is above 150°C;

[0015] (3) Heat the blank at 940-970°C for 2-6h for quenching, then cool it to 580-640°C by air cooling for tempering treatment, and then cool naturally.

[0016] In the above technical solution, under the pouring temperature of the present invention, excessive shrinkage and sand sticking are avoided, high-temperature air quenching, and medium-temperature tempering heat treatment are obtained to obtain a high-hardness matrix. In...

Embodiment 1

[0028] A kind of preparation method of high chromium cast iron hammer head, described preparation method comprises the following steps:

[0029] (1) In terms of mass percentage, the composition includes C: 2.6-2.8%; Si: 0.4-0.8%; Mn: 0.5-1.0%; Cr: 10-12%; Mo: 2.2-2.6%; Cu: 0.8-1.0% %; S: <0.05%; P: <0.08%, and the balance is Fe. Put the raw materials into the induction furnace for melting according to the low value of the aforementioned composition ratio, and melt to 1450°C;

[0030] (2) Adjust the chemical composition of the raw material. After the raw material is completely melted, deoxidize it, then pour it into a metal mold at 1350°C, and cool it to obtain a blank; wherein, the temperature of the metal mold is 150°C;

[0031] (3) First keep the blank at 200°C, 400°C, and 600°C for 2 hours, and then heat the blank at 940°C for 2 hours for quenching. When the temperature is lower than 700°C, the heating rate is controlled at 50°C / h; When the temperature rises to 700°C, the ...

Embodiment 2

[0035] A kind of preparation method of high chromium cast iron hammer head, described preparation method comprises the following steps:

[0036] (1) In terms of mass percentage, the composition includes C: 2.6-2.8%; Si: 0.4-0.8%; Mn: 0.5-1.0%; Cr: 10-12%; Mo: 2.2-2.6%; Cu: 0.8-1.0% %; S: <0.05%; P: <0.08%, and the balance is Fe. According to the high value of the above-mentioned composition ratio, the raw materials are added to the induction furnace for melting, and the melting temperature is 1480°C;

[0037] (2) adjust the chemical composition of the raw material, deoxidize after the raw material is completely melted, then pour it into a metal mold at 1420°C, cool it, and obtain a blank; wherein, the temperature of the metal mold is above 180°C;

[0038] (3) First keep the blank at 200°C, 400°C, and 600°C for 3 hours, and then heat the blank at 970°C for 6 hours for quenching. When the temperature is lower than 700°C, the heating rate is controlled at 40°C / h; When the temper...

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Abstract

The invention discloses a preparation method of a high-chromium iron hammerhead. The method comprises the following steps: (1) raw materials are fed in an induction furnace for smelting to reach a temperature of 1450-1480 DEG C according to the component ratios of the high-chromium iron hammerhead; (2) after all the raw materials are molten, the molten raw materials are poured in a metal mold at 1350-1420 DEG C for cooling to obtain a blank; and (3) the blank is insulated at 940-970 DEG C by 2-6 h for quenching, is cooled to 580-640 DEG C by an air cooling mode for tempering, and then, is naturally cooled. The preparation method improves the hardenability of high-chromium iron materials, improves the toughness of the high-chromium iron hammerhead, reduces the brittleness rupture tendency,and improves the wear resistance and the service life of the high-chromium iron hammerhead. The method only changes the process conditions in casting, that is, the problem of perplexing the performances of the hammerhead for a long time is solved; and the higher application value is achieved.

Description

technical field [0001] The invention relates to the field of casting, in particular to a method for preparing a high-chromium cast iron hammer head. Background technique [0002] The hammer head is the key accessory of the hammer crusher used in mining, building materials, electric power, metallurgy, chemical industry and other industries, and it is also a vulnerable part. Because the crushed objects are hard and brittle materials such as mines, rocks, and clinker, the lens requires both good wear resistance and good toughness. The commonly used high manganese steel hammer head has poor wear resistance and short service life. [0003] High chromium cast iron has good wear resistance because of its high hardness, so it is a good material choice for making hammer heads. When used as wear-resistant materials, high-chromium cast iron materials have high hardenability, hardenability and wear resistance, as well as good oxidation resistance and thermal fatigue resistance, but th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/06C21D1/18C21D9/00C21D5/00C22C37/10C22C37/06
CPCB22C9/06C21D1/18C21D5/00C21D9/0068C22C37/06C22C37/10
Inventor 柴知章王鑫杜宇风
Owner ANHUI POLYTECHNIC UNIV MECHANICAL & ELECTRICAL COLLEGE
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