Carbide-containing austempered ductile iron plowshare and production method thereof

A technology of isothermal quenching and production method, which is applied in the directions of plough, application, agricultural machinery and implements, etc., can solve the problems of high production cost, poor wear resistance, poor toughness, etc., so as to reduce agricultural production cost and solve the problem of poor toughness. Effect

Inactive Publication Date: 2009-12-02
宣化冶金工业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To solve the problems of high production cost and poor wear resistance of traditional low-alloy steel plows...

Method used

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  • Carbide-containing austempered ductile iron plowshare and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A plowshare of austempering ductile iron with carbides, the plowshare is made of austempering nodular cast iron, and the nodular cast iron includes the following chemical components in weight percentage:

[0037] C 3.40, Si 2.20, Mn 0.20, P≤0.03, S≤0.02,

[0038] Mg 0.03, Re 0.01, Cr 0.25, the rest is iron;

[0039] The metallographic structure of graphite in the ductile iron is as follows: nodularization rate is above grade 2, graphite size is above grade 6, and the number of graphite is more than 100 pieces / mm 2 ;

[0040] The matrix of the austempering ductile iron is: martensite+lower bainite+retained austenite+carbide; the carbide is 5wt%.

[0041] A method for producing an austempering ductile iron plowshare with carbides, comprising the steps of:

[0042] 1) Production of nodular cast iron: melting nodular cast iron molten iron in an induction furnace, the chemical composition requirement of the former molten iron of nodular graphite cast iron is (wt%):

[00...

Embodiment 2

[0058] A plowshare of austempering ductile iron with carbides, the plowshare is made of austempering nodular cast iron, and the nodular cast iron includes the following chemical components in weight percentage:

[0059] C 3.80, Si 2.80, Mn 0.50, P≤0.03, S≤0.02, Mg 0.04, Re 0.02,

[0060]Cr 0.50, the rest is iron;

[0061] The metallographic structure of graphite in the ductile iron is as follows: nodularization rate is above grade 2, graphite size is above grade 6, and the number of graphite is more than 100 pieces / mm 2 ;

[0062] The matrix of the austempering ductile iron is: martensite+lower bainite+retained austenite+carbide; the carbide is 5wt%.

[0063] Aforesaid production method of austempering nodular cast iron plowshare with carbide, comprises the steps:

[0064] 1) Production of nodular cast iron: melting nodular cast iron molten iron in an induction furnace, the chemical composition requirement of the former molten iron of nodular graphite cast iron is (wt%):

...

Embodiment 3

[0080] A plowshare of austempering ductile iron with carbides, the plowshare is made of austempering nodular cast iron, and the nodular cast iron includes the following chemical components in weight percentage:

[0081] C 3.56, Si 2.62, Mn 0.22, P 0.024, S 0.015,

[0082] Mg 0.038, Re 0.014, Cr 0.30, the rest is iron;

[0083] The metallographic structure of graphite in the ductile iron is as follows: nodularity rate 2, graphite size 7, graphite number 200 / mm 2 ;

[0084] The matrix of the austempering ductile iron is: martensite+lower bainite+retained austenite+carbide; the carbide is 10wt%.

[0085] Aforesaid production method of austempering nodular cast iron plowshare with carbide, comprises the steps:

[0086] 1) Production of nodular cast iron: melting nodular cast iron molten iron in an induction furnace, the chemical composition requirement of the former molten iron of nodular graphite cast iron is (wt%):

[0087] C 3.80, Si 1.80, Mn 0.50, P≤0.03,

[0088] S≤0.02,...

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Abstract

The invention discloses a carbide-containing austempered ductile iron plowshare, which uses austempered ductile iron as a raw material, wherein the ductile iron comprises the following chemical components in percentage by weight: 3.40 to 3.80 percent of C, 2.20 to 2.80 percent of Si, 0.20 to 0.50 percent of Mn, less than or equal to 0.03 percent of P, less than or equal to 0.02 percent of S, 0.03 to 0.04 percent of Mg, 0.01 to 0.02 percent of Re, 0.25 to 0.5 percent of Cr, and the balance of Fe; the graphite metallurgical structure in the ductile iron is characterized by a spheroidization rate of above grade-2, a graphite size of above grade-6 and a graphite quantity of more than 100 per square millimeters. The matrix of the ductile iron is martensite and lower bainite and residual austenite and carbide, wherein the carbide is less than 2 weight percent. The carbide-containing austempered ductile iron plowshare has the advantages of improving the conventional process for finely casting plowshares by using low alloy steel in the past, having a service life which is more than three times as long as that of the low alloy steel plowshares and a price as low as two thirds of that of the low alloy steel plowshares and greatly reducing agricultural production cost.

Description

technical field [0001] The invention relates to a plow share used in agriculture and a production method thereof, in particular to an austempering nodular cast iron plow share with carbides and a production method thereof. Background technique [0002] At present, as a large agricultural country, most of my country's agricultural machinery plowshares are made of white cast iron. Although it has high hardness, it has poor toughness and is easily damaged. Foreign agricultural machinery ploughshares are made of precision-cast low-alloy steel materials after quenching and tempering treatment. This kind of ploughshares has poor wear resistance and is expensive at the same time. [0003] Now the world's population is growing by 3% every year, which means that the demand for grains will increase accordingly every year. If we can develop high-quality and cheap new materials to manufacture agricultural machinery parts such as plowshares, it will not only reduce the cost of agricultu...

Claims

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Application Information

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IPC IPC(8): A01B15/04C22C37/10C21D5/00C21D1/20C21D1/34C22C33/10
Inventor 王怀林
Owner 宣化冶金工业有限责任公司
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