A kind of high strength and toughness ductile iron and preparation method thereof

A tough ball and cast iron technology, which is applied in the field of high-strength ductile cast iron and its preparation, can solve the problems that the mechanical properties of castings cannot meet the use requirements, poor mechanical properties, long production cycle, etc., and reduce the difficulty and cost of mold preparation. Method Simple and effective in reducing segregation

Active Publication Date: 2022-03-11
长沙合丰耐磨材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Sand casting ductile iron is prone to coarse structure, segregation, shrinkage porosity, and poor mechanical properties. It is necessary to add alloy elements and perform subsequent heat treatment to increase the number of pearlite and improve strength, which will lead to long p

Method used

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  • A kind of high strength and toughness ductile iron and preparation method thereof
  • A kind of high strength and toughness ductile iron and preparation method thereof
  • A kind of high strength and toughness ductile iron and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0029] Example one

[0030] A high-strength gao-tube cast iron and a preparation method thereof, steps are as follows:

[0031] (1) The raw material is ingredient according to the percentage of ingredients, and the C content of the ink cast iron is 3.2%, the Si content is 2.2%, the Mn content is 0.05%, and the S content is 0.03%, the Mg content of 0.05%, the margin is Fe ;

[0032] (2) According to the size of the desired workpiece, the steel sheet is added to the upper and lower sides of the sand type, the steel plate wall thickness is 30 mm, and the fixed cooling water pipe is surrounded by the outer side of the steel sheet, the inner diameter of the water pipe is 10 mm, the cooling water, the cooling water temperature is 20 ° C, using a top casting system, waiting for casting;

[0033] (3) Use the medium-frequency induction electric furnace to smelt, first join the ball ink cast iron with pig iron, scrap and carbonated agents, the melting temperature is 1400 ° C, completely mel...

Example Embodiment

[0037] Example 2

[0038] A high-strength gao-tube cast iron and a preparation method thereof, steps are as follows:

[0039] (1) The raw material is ingredient according to the percentage of ingredients, and the C content of the ink cast iron is 3.2%, the Si content is 2.2%, the Mn content is 0.05%, and the S content is 0.03%, the Mg content of 0.05%, the margin is Fe ;

[0040] (2) According to the size of the desired workpiece, the steel sheet is added to the upper and lower sides of the sand type, the steel plate wall thickness is 50 mm, and the cooling water pipe is fixed around the outer side of the steel sheet, the inner diameter of the water pipe is 8mm, and the cooling water is transferred, and the cooling water temperature is 10. ° C, using a top casting system, waiting for casting;

[0041] (3) Use the medium-frequency induction electric furnace to smelt, first join the ball ink cast iron with pig iron, scrap and carbonated agents, the melting temperature is 1400 ° C, c...

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Abstract

The invention provides a high-strength ductile cast iron and a preparation method thereof, belonging to the field of cast iron smelting and casting. Aiming at the problem that the high-strength ductile iron cannot satisfy the high tensile strength and elongation at the same time during sand casting, the composition of a high-strength ductile iron according to the present invention is C: 3.6-4.2%, Si: 2.0-2.5% , Mn: 0.6-1.2%, P: ≤0.1%, S: ≤0.03%, Mg: 0.03-0.08%, and the balance is Fe; special molds for steel plates and cooling pipes are added above and below the sand mold for ductile iron Melting and casting, without heat treatment process, can realize the effective control of pearlite content, and obtain pearlite ductile iron castings with dense structure. The prepared nodular cast iron workpiece has fewer casting defects, excellent mechanical properties, a tensile strength greater than 650MPa, and an elongation greater than 8%, and is suitable for large-scale production applications.

Description

technical field [0001] The invention provides a high-strength ductile cast iron and a preparation method thereof, belonging to the field of cast iron smelting and casting. [0002] technical background [0003] Ductile cast iron is a high-performance cast iron material. It is mainly characterized by containing spherical graphite. It is often used to manufacture parts with high requirements for strength, plasticity, toughness, wear resistance and dimensional stability. It is widely used in rail transit, metallurgical mining, Agriculture, navigation and other industries, especially high-strength ductile iron, can replace the use of cast steel and forged steel, effectively reduce costs, and have a good market prospect. [0004] Sand casting ductile iron is prone to coarse structure, segregation, shrinkage porosity, and poor mechanical properties. It needs to add alloy elements and carry out subsequent heat treatment to increase the number of pearlite and improve strength, which ...

Claims

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Application Information

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IPC IPC(8): C22C37/04C22C37/10C22C33/08B22C9/02B22D27/04
CPCC22C37/04C22C37/10C22C33/08B22C9/02B22D27/04
Inventor 李正龙刘祖铭李建尹莉丁秋宏
Owner 长沙合丰耐磨材料有限公司
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