High magnesium and low rare earth austenitic vermicular graphite cast iron, its preparation method and application

A vermicular graphite cast iron and austenite technology, applied in the field of cast iron, can solve the problems of low linear expansion coefficient and low wear resistance of cast iron inserts, and achieve the improvement of wear resistance, increase creep rate, and increase creep rate. Effect

Active Publication Date: 2019-09-20
BINZHOU BOHAI PISTON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to make up for the deficiencies of the prior art and solve the problems of low wear resistance and low linear expansion coefficient of the cast iron insert in the prior art, the present invention provides a high-magnesium, low-rare-earth austenitic vermicular graphite cast iron and a preparation method thereof and its application

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  • High magnesium and low rare earth austenitic vermicular graphite cast iron, its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0043] A high-magnesium and low-rare-earth austenitic vermicular graphite cast iron is composed of the following chemical components according to mass percentage:

[0044] Carbon 2.8%, silicon 2.6%, manganese 1.5%, nickel 10%, copper 6%, chromium 1.0%, magnesium 0.1%, rare earth 0.007%, titanium 0.15%, sulfur ≤ 0.08%, phosphorus ≤ 0.15%, the rest is iron and unavoidable impurities.

[0045] The preparation method of high magnesium and low rare earth austenitic vermicular graphite cast iron comprises the steps of:

[0046] 1) Add recarburizer, pig iron, and scrap steel to an intermediate frequency induction furnace for smelting, wherein the recarburizer is placed at the bottom; after melting, add electrolytic nickel, electrolytic copper, ferrosilicon, ferrochrome, and ferromanganese to continue smelting, and there is molten iron Then add the returned iron filings;

[0047] 2) When the composition of the cast iron solution is qualified and the temperature reaches 1560°C, keep it...

Embodiment 2

[0056] A high-magnesium and low-rare-earth austenitic vermicular graphite cast iron is composed of the following chemical components according to mass percentage:

[0057] Carbon 3.1%, silicon 2.3%, manganese 1.5%, nickel 13%, copper 5%, chromium 1.5%, magnesium 0.09%, rare earth 0.005%, titanium 0.6%, sulfur ≤ 0.08%, phosphorus ≤ 0.15%, the rest is iron and unavoidable impurities.

[0058] The preparation method of high magnesium and low rare earth austenitic vermicular graphite cast iron comprises the steps of:

[0059] 1) Add recarburizer, pig iron, and scrap steel to an intermediate frequency induction furnace for smelting, wherein the recarburizer is placed at the bottom; after melting, add electrolytic nickel, electrolytic copper, ferrosilicon, ferrochrome, and ferromanganese to continue smelting, and there is molten iron Then add the returned iron filings;

[0060] 2) When the composition of the cast iron solution is qualified and the temperature reaches 1550°C, keep ...

Embodiment 3

[0069] A high-magnesium and low-rare-earth austenitic vermicular graphite cast iron is composed of the following chemical components according to mass percentage:

[0070] 2.9% carbon, 2.5% silicon, 01.3% manganese, 8% nickel, 7% copper, 2.5% chromium, 0.08% magnesium, rare earth ≤0.0038%, titanium 0.12%, sulfur ≤0.08%, phosphorus ≤0.15%, and the rest is iron and unavoidable impurities.

[0071] The preparation method of high magnesium and low rare earth austenitic vermicular graphite cast iron comprises the steps of:

[0072] 1) Add recarburizer, pig iron, and scrap steel to an intermediate frequency induction furnace for smelting, wherein the recarburizer is placed at the bottom; after melting, add electrolytic nickel, electrolytic copper, ferrosilicon, ferrochrome, and ferromanganese to continue smelting, and there is molten iron Then add the returned iron filings;

[0073] 2) When the composition of the cast iron solution is qualified and the temperature reaches 1600°C, ...

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Abstract

The invention discloses high-magnesium and low-rare-earth austenite vermicular graphite cast iron and a preparation method and application thereof, and belongs to the field of cast iron. The high-magnesium and low-rare-earth austenite vermicular graphite cast iron comprises the following chemical constituents including 2.0%-3.8% of carbon, 1.5%-3.0% of silicon, 0.8%-2% of manganese, 7%-18% of nickel, 3%-8% of copper, 0.05%-2.7% of chromium, 0.08%-0.12% of magnesium, not larger than 0.03% of rare earth, 0.1%-0.18% of titanium, not larger than 0.08% of sulfur, not larger than 0.15% of phosphorusand the balance iron and inevitable impurities. The structure of the cast iron is an austenite matrix, vermicular graphite and a quite small amount of spheroidal graphite. Through adjustment on the contents of magnesium, titanium, rare earth and manganese and the process, the vermicularity rate of the obtained cast iron is larger than or equal to 91%, the tensile strength exceeds 360 MPa, the coefficient of linear expansion reaches 18.9*10<-6>, extremely good tensile strength and wear resistance are obtained, and unexpected effects are gained.

Description

technical field [0001] The invention relates to the field of cast iron, in particular to a high magnesium and low rare earth austenitic vermicular graphite cast iron, a preparation method and application thereof. Background technique [0002] The piston is the "heart" of the automobile engine, which bears alternating mechanical loads and thermal loads, and is one of the key components in the engine with the worst working conditions. One of the main factors affecting the service life of aluminum alloy pistons is the wear of piston ring grooves, especially the first ring groove. [0003] In order to improve the wear resistance of the first ring groove of the aluminum piston, cast iron wear-resistant ring seats (insert rings) are commonly used in the industry as an effective solution. This ring-inlaid piston not only maintains the light weight of the aluminum piston, but also Combined with the advantages of wear-resistant cast iron piston ring grooves, the service life of alum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C37/08C22C33/10F02F3/00
Inventor 牟俊东王广青张卫东朱俊奎张涛李金辉李小勇
Owner BINZHOU BOHAI PISTON CO LTD
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