High-strength high-ductility nodular cast iron and manufacturing method thereof

A technology of ductile cast iron and its manufacturing method, which is applied in the field of high plasticity ductile iron, the manufacture of ductile iron, and high-strength fields, to achieve high elongation, good performance, and improve the performance of castings

Active Publication Date: 2012-10-24
SINO TRUK JINAN POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems that the existing ordinary ductile iron materials in China have poor plasticity when the strength is high, and low strength when the plasticity is high, the present invention provides a high-strength, high-strength plastic ductile iron

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add steel scrap, pig iron, recycled materials and alloys into the intermediate frequency electric furnace according to the ingredients. After smelting, the chemical composition of the main elements of the molten iron (wt%) C: 3.79, Si: 1.55, Mn: 0.40, S: 0.028, P: 0.035, Cu: 0.10, Cr: 0.05, Sb: 0.0024, and the rest are Fe, etc. The original molten iron is released at 1480°C. Add 1.7% nodulizer, 0.28% inoculant and 0.32% pure copper by pouring into the ladle. Pour into the ladle for spheroidizing treatment, add the rest of the original molten iron after the molten iron in the ladle is sedated, and add an inoculant with a weight of 0.38% of the original molten iron along with the flow. The final chemical composition (wt%) C: 3.76, Si: 2.56, Mn: 0.39, S: 0.016, P: 0.036, Cu: 0.44, Cr: 0.05, Sb: 0.0023, Mg: 0.059, Re: 0.021, and the rest are Fe. Use this molten iron to pour heavy card axle housing at 1380 ℃. The tensile strength of the obtained nodular cast iron single-c...

Embodiment 2

[0034] Example 3:

[0035]Add steel scrap, pig iron, recycled materials and alloys into the intermediate frequency electric furnace according to the ingredients. After smelting, the chemical composition of the main elements of the molten iron (wt%) C: 3.59, Si: 1.50, Mn: 0.46, S: 0.022, P: 0.038, Cu: 0.08, Cr: 0.10, Sb: 0.0026, and the rest are Fe, etc. The original molten iron is released from the furnace at 1508°C. Add 1.6% nodulizer, 0.3% inoculant and 0.35% pure copper by pouring into the original molten iron, and add 0.4% inoculant by weight of the original molten iron along with the flow. Get the final chemical composition (wt%) C: 3.57, Si: 2.46, Mn: 0.43, S: 0.014, P: 0.040, Cu: 0.42, Cr: 0.10, Sb: 0.0026, Mg: 0.050, Re: 0.017, and the rest are Fe. Use this molten iron to start pouring heavy card bracket castings at 1405°C. The tensile strength of the obtained nodular cast iron single-cast test bar is Rm=635MPa, the yield strength Rp0.2=395MPa, the elongation is 10....

Embodiment 3

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PUM

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Abstract

The invention relates to the technical field of nodular cast iron material, in particular to a type of high-strength high-ductility nodular cast iron which contains the following ingredients by weight percent: 3.4-3.8% of C, 2.3-2.7% of Si, 0.3-0.5% of Mn, 0-0.03% of S, 0-0.04% of P, 0.3-0.5% of Cu, 0.02-0.10% of Cr, 0.001-0.005% of Sb, 0.03-0.06% of Mg, 0.01-0.03% of Re and the balance Fe. With the nodular cast iron material disclosed by the invention, a greater quantity of graphite with higher roundness can be obtained, matrix structures with a certain content ratio of ferrite and pearlite can be obtained, and castings with both higher strength and higher elongation under a cast state can be stably produced. The performance of the castings is improved and the using requirements of the castings such as an axle housing of a drive axle of a heavy-duty truck, and a bracket are satisfied.

Description

technical field [0001] The invention relates to the technical field of nodular cast iron materials, in particular to a high-strength, high-plasticity nodular cast iron and a method for manufacturing the nodular cast iron. Background technique [0002] According to the national standard of tensile strength, the grades of ductile iron mainly include QT400-15, QT400-18, QT450-10, QT500-7, QT550-5, QT600-3, QT700-2, etc. When the strength is high, the plasticity is poor and high. low strength. With the increase in tonnage and weight reduction of heavy-duty trucks, the currently used ductile iron materials can no longer meet the requirements for the use of drive axle housings and bracket castings. It is hoped to have a ductile iron material with high strength and certain plasticity. [0003] At present, domestic manufacturers mainly use traditional technology to produce according to national standards. To produce materials such as high-strength and high-plasticity QT550-9 that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/04C22C33/08
Inventor 刘长森侯广怀王正军黄国涛
Owner SINO TRUK JINAN POWER
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