CN103667859A - Multi-component low-melting-point fine-grain non-net medium-chromium cast iron and preparation method thereof - Google Patents
Multi-component low-melting-point fine-grain non-net medium-chromium cast iron and preparation method thereof Download PDFInfo
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- CN103667859A CN103667859A CN201310577014.5A CN201310577014A CN103667859A CN 103667859 A CN103667859 A CN 103667859A CN 201310577014 A CN201310577014 A CN 201310577014A CN 103667859 A CN103667859 A CN 103667859A
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Abstract
The invention discloses a multi-component low-melting-point fine-grain non-net medium-chromium cast iron and preparation method thereof. The fine-grain non-net medium-chromium cast iron has the following chemical components in percentage by weight: 2.0 to 2.6% of C, 0.6 to 1.5% of Mn, less than or equal to 0.8% of Si, 5.0 to 10.0% of Cr, less than or equal to 0.6% of S, less than or equal to 0.06% of P, 0.5 to 1.2% of multi-component fine-grain elements set and 0.1 to 0.6% of hardenable elements and the balance of iron. The preparation method comprises firstly feeding and then melting in the electric furnace, performing modification treatment, casting and finally performing heat treatment to obtain the final product. The material provided by the invention has 10 joules of impact toughness, above 600 MPa of tensile strength; the wear resistance of materials is improved by 2.7 times (relative to manganese steel); physical properties has undergone major changes, no cracks are generated when flame cutting can be performed, and the thermal performance of the material is enhanced.
Description
Technical field
The present invention relates to a kind of medium chrome cast iron and preparation method thereof, be specifically related to non-netted medium chrome cast iron of thin crystalline substance of a kind of polynary low melting point and preparation method thereof.
Background technology
Domestic existing medium chrome cast iron material material property is described below: C:2.6～3.0, and Mn:0.8～3.0, Si:0.8～1.2%, Cr:5.0-10.0%, S :≤0.1%, P :≤0.1%, surplus is iron.The impact toughness of the medium chrome cast iron material of prior art is 3.0-6.0J/cm
2, HRC is 48-55, and the toughness of material is large, and application region is limited.
Solution medium chrome cast iron material wear-resistant performance is good but material fragility is large, in grinding equipment, is difficult to application.Because performance exists the application limited to a great extent medium chrome cast iron, be just intended to the new process of production of high-quality medium chrome cast iron to carry out useful exploration, expectation exploitation alloying element content is low, stable performance take the medium chrome cast iron that tempered martensite is matrix.
Summary of the invention
The object of the invention is the just defect of above prior art, non-netted medium chrome cast iron of thin crystalline substance of a kind of polynary low melting point and preparation method thereof is provided.
Object of the present invention can be achieved through the following technical solutions:
A kind of non-netted medium chrome cast iron of thin crystalline substance of polynary low melting point, the chemical constitution that it is characterized in that the non-netted medium chrome cast iron of thin crystalline substance of described polynary low melting point is by weight percentage: C:2.0-2.6%, Mn:0.6-1.5%, Si :≤0.8%, Cr:5.0-10.0%, S :≤0.06%, P :≤0.06%, polynary thin brilliant element set: 0.5-1.2%, hardening capacity element: 0.1-0.6%, surplus is iron.
The preparation method of the non-netted medium chrome cast iron of thin crystalline substance of described polynary low melting point, comprises the following steps:
(1) generally reinforced in the normal order, first pack the infusibility iron alloys such as gray iron, molybdenum-iron into furnace bottom, then steel scrap etc. is loaded according to Xia Jinshang Songyuan City.
(2) furnace power is adjusted to maximum and melts, temperature rises to 1520 ℃-1580 ℃.
(3) during melting to adding the processing of going bad of seven kinds of low melting point metals such as rare earth, antimony, copper, bismuth in molten iron.
(4) will in hot metal ladle, add insulating covering agent in molten iron surface, calmness, cast.
(5) foundry goods is heated to 950 ℃-1050 ℃, by batch, determines soaking time, partially carbonized thing is dissolved, the oil quenching of coming out of the stove, is heated to 280 ℃ of insulations 5 hours, air cooling subsequently.
In the preparation method's of the non-netted medium chrome cast iron of thin crystalline substance of above-mentioned polynary low melting point step 4, the temperature of cast is controlled at 1380 ℃-1410 ℃.
Beneficial effect of the present invention:
1, material impact toughness reaches more than 10 joules of above, tensile strength reach 600MP.
2, material wear-resistant performance improves 2.7 times (with respect to manganese steel).
3, metallographic structure be point-like, roll into a ball spherical.Thoroughly change the reticulattion of medium chrome cast iron.
4, there is significant change in physicals, can carry out flame cutting and do not crack, and the heat conductivility of material strengthens, and the internal stress producing when martensite forms reduces.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail:
Embodiment 1
A kind of non-netted medium chrome cast iron of thin crystalline substance of polynary low melting point, the chemical constitution that it is characterized in that the non-netted medium chrome cast iron of described thin crystalline substance is by weight percentage: C:2.0%, Mn:0.6%, Si:0.8%, Cr:5.0%, S:0.04%, P:0.04%, polynary thin brilliant element set: 0.5%, hardening capacity element: 0.2%, surplus is iron.
The preparation method of the non-netted medium chrome cast iron of thin crystalline substance of described polynary low melting point, comprises the following steps:
(1) generally reinforced in the normal order, first pack the infusibility iron alloys such as gray iron, molybdenum-iron into furnace bottom, then steel scrap etc. is loaded according to Xia Jinshang Songyuan City.
(2) furnace power is adjusted to maximum and melts, temperature rises to 1520 ℃.
(3) during melting to adding the processing of going bad of seven kinds of low melting point metals such as rare earth, antimony, copper, bismuth in molten iron.
(4) will in hot metal ladle, add insulating covering agent in molten iron surface, calmness, cast, teeming temperature is controlled at 1380 ℃.
(5) foundry goods is heated to 950 ℃, by batch, determines soaking time, partially carbonized thing is dissolved, the oil quenching of coming out of the stove, is heated to 280 ℃ of insulations 5 hours, air cooling subsequently.
The tested for hardness of the thick test block of the non-netted medium chrome cast iron 20mm of thin crystalline substance of the polynary low melting point obtaining according to above method is HRC58, and the impelling strength of 20mm * 20mm * 110mm non-notch sample is 10J/cm
2.
Embodiment 2
A kind of non-netted medium chrome cast iron of thin crystalline substance of polynary low melting point, the chemical constitution that it is characterized in that the non-netted medium chrome cast iron of described thin crystalline substance is by weight percentage: C:2..2%, Mn:0.8%, Si:0.6%, Cr:7.0%, S:0.02%, P:0.02%, polynary thin brilliant element set: 0.7%, hardening capacity element: 0.4%, surplus is iron.
The preparation method of the non-netted medium chrome cast iron of thin crystalline substance of described polynary low melting point, comprises the following steps:
(1) generally reinforced in the normal order, first pack the infusibility iron alloys such as gray iron, molybdenum-iron into furnace bottom, then steel scrap etc. is loaded according to Xia Jinshang Songyuan City.
(2) furnace power is adjusted to maximum and melts, temperature rises to 1540 ℃.
(3) during melting to adding the processing of going bad of seven kinds of low melting point metals such as rare earth, antimony, copper, bismuth in molten iron.
(4) will in hot metal ladle, add insulating covering agent in molten iron surface, calmness, cast, teeming temperature is controlled at 1400 ℃.
(5) foundry goods is heated to 1000 ℃, by batch, determines soaking time, partially carbonized thing is dissolved, the oil quenching of coming out of the stove, is heated to 280 ℃ of insulations 5 hours, air cooling subsequently.
The tested for hardness of the thick test block of the non-netted medium chrome cast iron 20mm of thin crystalline substance of the polynary low melting point obtaining according to above method is HRC60, and the impelling strength of 20mm * 20mm * 110mm non-notch sample is 12J/cm
2.
Embodiment 3
A kind of non-netted medium chrome cast iron of thin crystalline substance of polynary low melting point, the chemical constitution that it is characterized in that the non-netted medium chrome cast iron of described thin crystalline substance is by weight percentage: C:2.4%, Mn:1.0%, Si:0.4%, Cr:9.0%, S:0.06%, P:0.06%, polynary thin brilliant element set: 0.9%, hardening capacity element: 0.6%, surplus is iron.
The preparation method of the non-netted medium chrome cast iron of thin crystalline substance of described polynary low melting point, comprises the following steps:
(1) generally reinforced in the normal order, first pack the infusibility iron alloys such as gray iron, molybdenum-iron into furnace bottom, then steel scrap etc. is loaded according to Xia Jinshang Songyuan City.
(2) furnace power is adjusted to maximum and melts, temperature rises to 1560 ℃.
(3) during melting to adding the processing of going bad of seven kinds of low melting point metals such as rare earth, antimony, copper, bismuth in molten iron.
(4) will in hot metal ladle, add insulating covering agent in molten iron surface, calmness, cast, teeming temperature is controlled at 1410 ℃.
(5) foundry goods is heated to 1050 ℃, by batch, determines soaking time, partially carbonized thing is dissolved, the oil quenching of coming out of the stove, is heated to 280 ℃ of insulations 5 hours, air cooling subsequently.
The tested for hardness of the thick test block of the non-netted medium chrome cast iron 20mm of thin crystalline substance of the polynary low melting point obtaining according to above method is HRC60, and the impelling strength of 20mm * 20mm * 110mm non-notch sample is 12J/cm
2.
Claims (3)
1. the non-netted medium chrome cast iron of the thin crystalline substance of a polynary low melting point, the chemical constitution that it is characterized in that the non-netted medium chrome cast iron of described thin crystalline substance is by weight percentage: C:2.0-2.6%, Mn:0.6-1.5%, Si :≤0.8%, Cr:5.0-10.0%, S :≤0.06%, P :≤0.06%, polynary thin brilliant element set: 0.5-1.2%, hardening capacity element: 0.1-0.6%, surplus is iron.
2. a preparation method for the non-netted medium chrome cast iron of thin crystalline substance of polynary low melting point according to claim 1, comprises the following steps:
(1) generally reinforced in the normal order, first pack the infusibility iron alloys such as gray iron, molybdenum-iron into furnace bottom, then steel scrap etc. is loaded according to Xia Jinshang Songyuan City.
(2) furnace power is adjusted to maximum and melts, temperature rises to 1520 ℃-1580 ℃.
(3) during melting to adding the processing of going bad of seven kinds of low melting point metals such as rare earth, antimony, copper, bismuth in molten iron.
(4) will in hot metal ladle, add insulating covering agent in molten iron surface, calmness, cast.
(5) foundry goods is heated to 950 ℃-1050 ℃, by batch, determines soaking time, partially carbonized thing is dissolved, the oil quenching of coming out of the stove, is heated to 280 ℃ of insulations 5 hours, air cooling subsequently.
3. the preparation method of the non-netted medium chrome cast iron of thin crystalline substance of a kind of polynary low melting point according to claim 2, is characterized in that: in described step 4, the temperature of cast is controlled at 1380 ℃-1410 ℃.
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| CN201310577014.5A CN103667859A (en) | 2013-11-15 | 2013-11-15 | Multi-component low-melting-point fine-grain non-net medium-chromium cast iron and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104831157A (en) * | 2015-05-22 | 2015-08-12 | 安徽省宁国市宁沪钢球有限公司 | Abrasion-resistant high-chromium cast ball and preparation process thereof |
| CN108929980A (en) * | 2018-07-13 | 2018-12-04 | 宁国市正兴耐磨材料有限公司 | Evanohm cast ball and preparation method thereof in a kind of acid-alkali-corrosive-resisting |
| CN116083799A (en) * | 2022-12-29 | 2023-05-09 | 宁国东方碾磨材料股份有限公司 | High-hardness wear-resistant steel ball and preparation process thereof |
-
2013
- 2013-11-15 CN CN201310577014.5A patent/CN103667859A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104831157A (en) * | 2015-05-22 | 2015-08-12 | 安徽省宁国市宁沪钢球有限公司 | Abrasion-resistant high-chromium cast ball and preparation process thereof |
| CN108929980A (en) * | 2018-07-13 | 2018-12-04 | 宁国市正兴耐磨材料有限公司 | Evanohm cast ball and preparation method thereof in a kind of acid-alkali-corrosive-resisting |
| CN116083799A (en) * | 2022-12-29 | 2023-05-09 | 宁国东方碾磨材料股份有限公司 | High-hardness wear-resistant steel ball and preparation process thereof |
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