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Inoculated cast iron and preparation method thereof

A technology of inoculated cast iron and ingot, applied in the field of inoculated cast iron and its preparation, can solve the problems of lack of market competitiveness, high material cost, complicated preparation, etc., achieve low production cost, improve comprehensive mechanical properties, and improve carbide form Effect

Inactive Publication Date: 2014-03-19
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is complicated to prepare, the material cost is high, and the effect is not good, so it lacks market competitiveness

Method used

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  • Inoculated cast iron and preparation method thereof
  • Inoculated cast iron and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Weigh each raw material according to the composition of inoculated cast iron, the purity of chromium is greater than 99.5%; Si is added in the form of 75 ferrosilicon master alloy; Mn is added in the form of 65 ferromanganese master alloy; iron is added in the form of 20 steel; C is added in the form of graphite containing 99.9% carbon; Nd, Sn, Se and Ti are added in the form of Nd-Sn-Se-Ti-Zn iron alloy powder, and the particle diameter of the Nd-Sn-Se-Ti-Zn iron alloy powder is 1-3 mm, the composition and content are Nd 5%, Sn 5%, Se 5%, Ti 5%, Zn 5%, and the rest is iron; all percentages are percentages by weight. P and S in inoculated cast iron are brought in by 20 steel, 75 ferrosilicon master alloy and 65 ferromanganese master alloy.

[0027] Although Zn is contained in Nd-Sn-Ti-Se-Zn iron alloy powder, Zn volatilizes at high temperature.

[0028] (2) First add 75 ferrosilicon master alloy, 65 ferromanganese master alloy, 20 steel, chromium and graphite into ...

Embodiment 2

[0034] (1) Weigh each raw material according to the composition of inoculated cast iron, the purity of chromium is greater than 99.5%; Si is added in the form of 75 ferrosilicon master alloy; Mn is added in the form of 65 ferromanganese master alloy; iron is added in the form of 20 steel; C is added in the form of graphite containing 99.9% carbon; Nd, Sn, Se and Ti are added in the form of Nd-Sn-Se-Ti-Zn iron alloy powder, and the particle diameter of the Nd-Sn-Se-Ti-Zn iron alloy powder is 1-3 mm, the composition and content are Nd 5%, Sn 5%, Se 5%, Ti 5%, Zn 5%, and the rest is iron; all percentages are percentages by weight. P and S in inoculated cast iron are brought in by 20 steel, 75 ferrosilicon master alloy and 65 ferromanganese master alloy. Although the Nd-Sn-Ti-Se-Zn iron alloy powder contains Zn, Zn will volatilize at high temperature.

[0035] (2) First add 75 ferrosilicon master alloy, 65 ferromanganese master alloy, 20 steel, chromium and graphite into the indu...

Embodiment 3

[0041] (2) First add 75 ferrosilicon master alloy, 65 ferromanganese master alloy, 20 steel, chromium and graphite into the induction furnace to melt to form alloy liquid, and the melting temperature is 1520°C;

[0042] (3) Put the Nd-Sn-Se-Ti-Zn iron alloy powder into the pit in the embankment ladle, then cover it with plant ash, pour the alloy liquid into the ladle, and after 10 minutes, pour the liquid in the ladle Pouring into a steel metal mold to form an ingot, the shape of the ingot is a cylinder with a diameter of 100-200mm and a height of 200-400mm; the pouring temperature is 1500°C.

[0043] (4) Heating the ingot to 990° C. and holding it for 5 hours, air quenching, and tempering to obtain inoculated cast iron. The tempering temperature is 240°C.

[0044] Example 4

[0045] Inoculated cast iron, the weight percentage of each component is as follows: C 3.0%, Si 1.2%, Mn 1.2%, P 0.03%, S 0.06%, Cr 20%, Nd 0.20%, Sn 0.20%, Ti 0.20%, Se 0.20% and the rest is Fe.

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Abstract

The invention provides inoculated cast iron and a preparation method thereof and belongs to the field of metal materials. The inoculated cast iron comprises, by weight, C 3.3-3.5%, Si 1.3-1.5%, Mn 1.3-16%, P 0.03-0.05%, S 0.06-0.07%, Cr 21-23%, Nd 0.25-0.29%, Sn 0.25-0.29%, Ti 0.25-0.29%, Se 0.25-0.29% and the balance Fe. The preparation method comprises the steps of weighing raw materials, preparing molten alloy, adding Nd-Sn-Se-Ti-Zn into the molten alloy, casting a mixture into casting ingots, and performing heating, heat preservation, air quenching and tempering to obtain the inoculated cast iron. The inoculated cast iron has good comprehensive performance, the material cost is low, and the preparation method is simple.

Description

technical field [0001] The invention belongs to the field of metal materials and relates to an inoculated cast iron and a preparation method thereof. Background technique [0002] In the field of metal materials, the performance and preparation of cast iron is a research hotspot. The patent number is 200910068334.1, and the invention patent named high-chromium cast iron composite inoculant and its preparation method discloses a chromium-containing cast iron alloy. The high-chromium cast iron composite inoculant is a nanocrystalline rare earth ferrosilicon + ferroboron The high-chromium cast iron composite inoculant is composed of Fe-Ce-Si-Ca master alloy and Fe-B master alloy, and its weight ratio is Fe-Ce-Si-Ca master alloy: Fe-B master alloy=1: 0.07~ 0.13. The preparation method of this high-chromium cast iron composite inoculant is: the commercially available Fe-Ce-Si-Ca master alloy whose element composition is 30.7% Fe, 30% Ce, 37.5% Si and 1.8% Ca and the element com...

Claims

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Application Information

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IPC IPC(8): C22C37/06C22C37/10C22C33/08
Inventor 张群赵浩峰王玲刘光宇邱奕婷张咏林莹莹郑泽昌张金花陆阳平
Owner NANJING UNIV OF INFORMATION SCI & TECH
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