High-performance high-nickel austenitic vermicular graphite cast iron for piston inserts and preparation method thereof

A high-performance technology of compacted graphite cast iron, which is applied in the field of high-performance high-nickel austenitic compacted graphite cast iron for piston inserts and its preparation, can solve the problems of subcutaneous pores and discomfort of castings, improve the service life and simplify the process , easy-to-achieve effects

Active Publication Date: 2016-08-24
滨州市正道机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As we all know, when 75 ferrosilicon is used as the inoculant, the aluminum content in the molten iron should not be too high. Adding 0.01% aluminum may cause subcutaneous pores in the casting. The aluminum content of this application is much higher than this value, so it is not suitable for application To the field of piston wear ring

Method used

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  • High-performance high-nickel austenitic vermicular graphite cast iron for piston inserts and preparation method thereof
  • High-performance high-nickel austenitic vermicular graphite cast iron for piston inserts and preparation method thereof
  • High-performance high-nickel austenitic vermicular graphite cast iron for piston inserts and preparation method thereof

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Embodiment 1

[0041]In this embodiment, high-performance high-nickel austenitic vermicular graphite cast iron for piston rings is configured as the following components by mass percentage: 2.8% carbon, 2.67% silicon, 1.35% manganese, 14.39% nickel, 6.33% copper, and 1.33% chromium. , magnesium 0.014%, rare earth 0.013%, sulfur ≤ 0.010%, phosphorus ≤ 0.018%, and the rest are iron and unavoidable impurities.

[0042] The preparation method is as follows:

[0043] (1) Add pig iron and scrap steel to an intermediate frequency induction furnace for smelting, add ferrosilicon, ferromanganese, ferrochrome, electrolytic nickel and electrolytic copper after melting to continue smelting to obtain a smelting solution; the temperature of the smelting solution is 1550°C.

[0044] (2) Firstly, the vermicularizing agent is used to vermicularize the smelting liquid, and then the slag is removed; among them, the vermicularizing agent is a rare earth magnesium alloy, and the vermicularizing treatment adopts ...

Embodiment 2

[0049] In this embodiment, high-performance high-nickel austenitic vermicular graphite cast iron for piston rings is configured as the following components by mass percentage: 2.9% carbon, 2.68% silicon, 0.82% manganese, 14.85% nickel, 6.29% copper, and 1.14% chromium. , magnesium 0.016%, rare earth 0.015%, sulfur ≤ 0.010%, phosphorus ≤ 0.018%, and the rest are iron and unavoidable impurities.

[0050] The preparation method is as follows:

[0051] (1) Add pig iron and steel scrap to an intermediate frequency induction furnace for smelting, add ferrosilicon, ferromanganese, ferrochrome, electrolytic nickel and electrolytic copper after melting to continue smelting to obtain a smelting solution; the temperature of the smelting solution is 1560°C.

[0052] (2) Firstly, the vermicularizing agent is used to vermicularize the smelting liquid, and then the slag is removed; among them, the vermicularizing agent is a rare earth magnesium alloy, and the vermicularizing treatment adopts...

Embodiment 3

[0057] In this embodiment, high-performance high-nickel austenitic vermicular graphite cast iron dedicated to the piston ring is configured as the following components by mass percentage: 3.1% carbon, 2.32% silicon, 1.35% manganese, 13.89% nickel, 5.96% copper, and 1.34% chromium. , magnesium 0.015%, rare earth 0.014%, sulfur ≤ 0.010%, phosphorus ≤ 0.018%, and the rest are iron and unavoidable impurities.

[0058] The preparation method is as follows:

[0059] (1) Add pig iron and scrap steel to an intermediate frequency induction furnace for smelting, add ferrosilicon, ferromanganese, ferrochrome, electrolytic nickel and electrolytic copper after melting to continue smelting to obtain a smelting solution; the temperature of the smelting solution is 1540°C.

[0060] (2) Firstly, the vermicularizing agent is used to vermicularize the smelting liquid, and then the slag is removed; among them, the vermicularizing agent is a rare earth magnesium alloy, and the vermicularizing trea...

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Abstract

The invention relates to a vermicular cast iron, particularly a special high-performance high-nickel austenite vermicular cast iron for piston mounting rings and a preparation method thereof. The vermicular cast iron comprises the following chemical components in percentage by mass: 2.0-4.0% of carbon, 1.0-4.0% of silicon, 0.5-8.0% of manganese, 6.0-17.5% of nickel, 2.0-7.5% of copper, at most 2.5% of chromium, 0.008-0.020% of magnesium, 0.01-0.02% of rare earth, at most 0.1% of sulfur, at most 0.2% of phosphorus, and the balance of iron and inevitable impurities. The vermicular cast iron has favorable impact toughness, wear resistance and thermal fatigue strength. The tensile strength sigma b is greater than or equal to 350 MPa, the elongation percentage delta is greater than or equal to 4.5%. The vermicular cast iron has stable performance and longer service life, and greatly prolongs the service life of the piston mounting ring, thereby prolonging the service life of the piston in the engine. The invention also provides a preparation method of the vermicular cast iron, which is simple in technique and easy to implement.

Description

technical field [0001] The invention relates to vermicular graphite cast iron, in particular to a high-performance high-nickel austenitic vermicular graphite cast iron for piston inserts and a preparation method thereof. Background technique [0002] With the lightweight trend of mechanical assembly such as automobiles and the stricter emission requirements, high-power, high-torque, low-emission engines are becoming more and more popular. With the improvement of engine requirements, not only its design requirements, but also higher requirements are put forward for the materials and manufacturing technology of related important parts, which requires materials not only to have good thermal conductivity and shock absorption performance, but also to have Higher tensile strength, higher impact resistance, wear resistance, oxidation resistance and thermal fatigue resistance. [0003] The main form of failure of the aluminum piston is the excessive wear of the first ring groove, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C33/08
Inventor 苏道胜林志雷石路宁
Owner 滨州市正道机械制造有限公司
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