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Ductile iron for heavy type vehicle integrated axle housing

A technology of nodular cast iron and heavy-duty vehicles, which is applied in axles, wheels, vehicle parts, etc., and can solve the problems that the strength cannot meet the design requirements, the axle housing design requirements, and low toughness

Inactive Publication Date: 2009-08-12
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material strength of QT450-10 cannot meet the design requirements. The national standard grade of cast iron material that meets its high strength requirements is QT600-3, but the material has low toughness and does not meet the design requirements of the axle housing performance. Therefore, it is required to develop a high-strength, High toughness ductile iron material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] This QT600-5 nodular cast iron adopts the smelting method of complete scrap steel + recarburizer in the medium frequency induction furnace to smelt the molten metal of the axle housing. According to the parts by weight, carbon is 3.75, sulfur is 0.009, phosphorus is 0.033, manganese is 0.14, silicon is 2.38, copper is 0.66, Magnesium 0.035, rare earth 0.010.

[0009] Take samples from the axle housing body for physical and chemical testing. The test results are as follows: Metallographic structure test results are spheroidization classification: 3 grades; graphite size classification: 6 grades; matrix structure: pearlite plus ferrite; pearlite number: beads 65; tensile strength Rm (N / mm 2 )660, specified non-proportional extension strength Rp 0.2 (N / mm 2 ) 535, elongation after break A (%) 7.0, hardness (HBW) 217.

Embodiment 2

[0011] This QT600-5 nodular cast iron adopts the smelting method of complete scrap steel + recarburizer in the medium frequency induction furnace to smelt the molten metal of the axle housing. According to the parts by weight, carbon is 3.72, sulfur is 0.009, phosphorus is 0.032, manganese is 0.15, silicon is 2.45, copper is 0.70, Magnesium 0.035, rare earth 0.012.

[0012] Take samples from the axle housing body for physical and chemical testing. The test results are as follows: Metallographic structure test results are spheroidization classification: 3 grades; graphite size classification: 6 grades; matrix structure: pearlite plus ferrite; pearlite number: beads 65; tensile strength Rm (N / mm 2 )680, specified non-proportional extension strength Rp 0.2 (N / mm 2 ) 545, elongation after break A (%) 8.0, hardness (HBW) 207.

Embodiment 3

[0014] This QT600-5 nodular cast iron adopts the smelting method of complete scrap steel + recarburizer in the intermediate frequency induction furnace to smelt the molten metal of the axle housing. The parts by weight are composed of carbon 3.75, sulfur 0.009, phosphorus 0.030, manganese 0.15, silicon 2.37, copper 0.68, Magnesium 0.035, rare earth 0.012.

[0015] Take samples from the axle housing body for physical and chemical testing. The test results are as follows: Metallographic structure test results are spheroidization classification: 3 grades; graphite size classification: 6 grades; matrix structure: pearlite plus ferrite; pearlite number: beads 65; tensile strength Rm (N / mm 2 )660, specified non-proportional extension strength Rp 0.2 (N / mm 2 ) 545, elongation after break A (%) 7.0, hardness (HBW) 207.

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Abstract

The invention relates to spheroidal graphite cast iron for an integral axle housing of a heavy vehicle, which is characterized by comprising the following materials in portion by weight: 3.70 to 3.85 portions of carbon, 0 to 0.01 portion of sulfur, 0 to 0.035 portion of phosphorus, 0 to 0.50 portion of manganese, 2.1 to 2.4 portions of silicon, 0.5 to 0.8 portion of copper, 0.030 to 0.055 portion of magnesium and 0 to 0.030 portion of rare earths. The melting process of the spheroidal graphite cast iron adopts the melting mode of complete scrap steel and recarburizer to melt molten metal of the axle housing and does not use pig iron, namely the melting process adopts the melting mode of synthesis of cast iron. The spheroidal graphite cast iron for the integral axle housing of the heavy vehicle has high strength and high toughness; and the tensile strength reaches more than 600 MPa, and the elongation percentage reaches more than 5 percent, namely QT600-5.

Description

technical field [0001] The invention relates to a nodular cast iron used for an integrated axle housing of a heavy vehicle, which is a novel cast iron material applied to an automobile axle housing. Background technique [0002] At present, most of the cast iron materials for automobile axle housings are QT450-10. With the development of integrated axles for heavy vehicles, the axle housings are required to have high strength and high toughness. The material strength of QT450-10 cannot meet the design requirements. The national standard grade of cast iron material that meets its high strength requirements is QT600-3, but the material has low toughness and does not meet the design requirements of the axle housing performance. Therefore, it is required to develop a high-strength, High toughness ductile iron material. Contents of the invention [0003] The purpose of the present invention is to provide a kind of nodular cast iron used for the integrated axle housing of heavy...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08B60B35/16
Inventor 李伟徐香秋张义和刘柯军邹德志王成刚马顺龙孙树臣马林
Owner CHINA FIRST AUTOMOBILE
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