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Melting ingredient for piston

A piston and smelting technology, applied in the field of casting pistons, can solve the problems of easy deformation and wear of pistons, low hardness, high brittleness, etc., and achieve the effect of good graphite shape, high tensile strength, and low brittleness

Inactive Publication Date: 2013-03-13
JIANGSU LEADER PRECISION MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a smelting ingredient for pistons, which mainly solves the problems of easy deformation, wear, low hardness and high brittleness of the piston formed by casting the smelting ingredients of the existing pistons.

Method used

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Effect test

specific Embodiment 1 10

[0022] Specific embodiments of the present invention one to ten, by mass percentage (%) are specifically as follows:

[0023]

[0024] The rest is iron.

[0025] Below in conjunction with the selection of raw materials in the specific preparation process, smelting and final molding process, the above-mentioned embodiment is described in detail:

Embodiment 2

[0027] 1] Raw material selection: take 700kg of pig iron, 2000kg of scrap steel, 2300kg of returned charge, the total weight is 5000kg, and then add 40kg of silicon carbide, 46.5kg of recarburizer, 16.5kg of ferrosilicon, 0.5kg of ferromanganese, and 5.5kg of iron sulfide;

[0028] Among them, the carbon content in pig iron is 4.20%, the silicon content is 1.22%, the manganese content is 0.15%, the sulfur content is 0.021%, the phosphorus content is 0.05%, and the rest is iron; the scrap steel carbon content is 0.33%, The silicon content is 0.23%, the manganese content is 0.64%, the sulfur content is 0.023%, the phosphorus content is 0.04%, the chromium content is 0.04%, and the rest is iron; the carbon content of the returned charge is 3.2%, and the silicon content is 2.3%, 0.75% manganese, 0.085% sulfur, 0.04% phosphorus, 0.4% chromium, 0.025% antimony, 0.45% copper, and the rest is iron;

[0029] 2] After mixing the above raw materials evenly, smelting is carried out, and t...

Embodiment 4

[0035] 1] Raw material selection: take 500kg of pig iron, 2000kg of scrap steel, 2500kg of recycle materials, the total weight is 5000kg, and then add 30kg of silicon carbide, 62.5kg of carburizer, 8.2kg of ferrosilicon, 0.4kg of ferromanganese, and 6.2kg of iron sulfide;

[0036] Among them, the carbon content in pig iron is 4.35%, the silicon content is 1.25%, the manganese content is 0.2%, the sulfur content is 0.03%, the phosphorus content is 0.03%, and the rest is iron; the scrap steel carbon content is 0.3%, The silicon content is 0.25%, the manganese content is 0.55%, the sulfur content is 0.03%, the phosphorus content is 0.02%, the chromium content is 0.04%, and the rest is iron; the carbon content of the returned charge is 3.2%, and the silicon content is 2.3%, 0.75% manganese, 0.085% sulfur, 0.04% phosphorus, 0.4% chromium, 0.155% molybdenum, 0.025% antimony, and 0.45% copper , the rest is iron;

[0037] 2] After mixing the above raw materials evenly, smelting is ca...

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Abstract

The invention provides a melting ingredient for a piston, and the melting ingredient is mainly used for solving the problems that the pistons cast and formed from the existing melting ingredient are easy to deform and wear and have lower hardness and larger brittleness. The melting ingredient for the piston comprises the following components in percentage by weight: 2.3-3.5 of carbon, 1.7-2.2 of silicon, 0.6-0.9 of manganese, 0-0.12 of sulfur, 0-0.1 of phosphorus, 0-0.06 of chrome, 0.01-0.02 of antimony, 0.2-0.5 of copper and the balance of iron. The melting ingredient for the piston is molten, casted and formed to obtain a piston finished product; and the obtained piston finished product is not easy to deform and wear and has the advantages of high tensile strength, less brittleness, good graphite morphology and lower cost.

Description

technical field [0001] The invention relates to a smelting ingredient for pistons, which is mainly used for casting pistons. Background technique [0002] The piston is the "heart" of the engine, which bears alternating mechanical loads and thermal loads, and is one of the key components in the engine with the worst working conditions. The function of the piston is to withstand the gas pressure and transmit it to the connecting rod through the piston pin to drive the crankshaft to rotate. Pistons often work under conditions of high temperature, high pressure, high speed, and poor lubrication. The piston is directly in contact with high-temperature gas, and the instantaneous temperature can reach more than 2500K. Therefore, the heat is severe, and the heat dissipation condition is poor, so the temperature of the piston is very high when it is working, and the top is as high as 600-700K, and the temperature distribution is very uneven; the top of the piston bears The gas pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C33/08
Inventor 陆寅鹏
Owner JIANGSU LEADER PRECISION MACHINERY
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