Preparation method of high-chromium iron hammerhead
A technology of high chromium cast iron and hammer head, which is applied in the field of preparation of high chromium cast iron hammer head, can solve the problems that plague the hammer head performance, achieve the effects of improving toughness, reducing brittle fracture tendency, and improving hardenability
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[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 sand molds at 1350-1420°C, and cool to obtain blanks;
[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 terms of performance, the hardenability of high-chromium cas...
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 materials. After the raw materials are completely melted, deoxidize them, then pour them into sand molds at 1350°C, and cool them down to obtain blanks;
[0031] (3) First keep the blank at 200°C, 400°C, and 600°C for 2 hours, and then keep the blank at 940°C for 2 hours. During the heating process, the heating rate is controlled at 50°C / h; The speed is 100℃ / h;
[0032] (4) After quenching, cool to 580°C by air cooling for 4 hours for tempering trea...
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 materials. After the raw materials are completely melted, deoxidize them, then pour them into sand molds at 1420°C, and cool them down to obtain blanks;
[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. During the heating process, the heating rate is controlled at 50°C / h; when the temperature is raised to 700°C , the heating rate is 150℃ / h; ...
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