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Cast state high strength high extensibility nodular cast iron material

A technology of nodular cast iron and high elongation, which is applied in the field of casting materials, can solve the problems that the strength and elongation are not suitable for the needs of heavy vehicles and high cost, and achieve the effect of high tensile strength and high elongation

Inactive Publication Date: 2007-01-24
CHINA NATIONAL HEAVY DUTY TRUCK GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Current ductile iron materials are not suitable for heavy-duty automotive parts in terms of strength and elongation, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The components and weight percentages of the high-strength and high-elongation ductile iron material are: C 3.55%, Si 3.1%, Mn 0.28%, S 0.02%, P 0.04%, and the balance is Fe.

[0014] The above-mentioned nodular cast iron material is mixed according to the given range of components, then smelted in an electric furnace, then spheroidized, inoculated, poured into the pre-made resin sand mold, cooled to below 500°C after molding, and opened the box, that is Get castings of the required material.

[0015] The as-cast mechanical properties of the above-mentioned nodular cast iron material castings are measured as follows: tensile strength σ b =486MPa, yield strength σ 0.2 =329MPa, δ=22.6%, Brinell hardness HB172, casting metallographic structure matrix is ​​ferrite=90%, cementite≤1%, phosphorus eutectic≤1%.

Embodiment 2

[0017] The components and weight percentages of the high-strength and high-elongation ductile iron material are: C 3.68%, Si 2.96%, Mn 0.2%, S 0.02%, P0.04%, and the balance is Fe.

[0018] The above-mentioned nodular cast iron material is mixed according to the given range of components, then smelted in an electric furnace, then spheroidized, inoculated, poured into the pre-made resin sand mold, cooled to below 500°C after molding, and opened the box, that is Get castings of the required material.

[0019] The as-cast mechanical properties of the above-mentioned nodular cast iron material castings are measured as follows: tensile strength σ b =495MPa, yield strength σ 0.2 =327MPa, δ=21.8%, Brinell hardness HB178, casting metallographic structure matrix is ​​ferrite=90%, cementite≤1%, phosphorus eutectic≤1%.

Embodiment 3

[0021] The components and weight percentages of the high-strength and high-elongation ductile iron material are: C 3.8%, Si 2.82%, Mn 0.24%, S 0.03%, P 0.04%, and the balance is Fe.

[0022] The above-mentioned nodular cast iron material is mixed according to the given range of components, then smelted in an electric furnace, then spheroidized, inoculated, poured into the pre-made resin sand mold, cooled to below 500°C after molding, and opened the box, that is Get castings of the required material.

[0023] The as-cast mechanical properties of the above-mentioned nodular cast iron material castings are measured as follows: tensile strength σ b =502MPa, yield strength σ 0.2 = 331MPa, δ = 20.1%, Brinell hardness HB 174, casting metallographic structure matrix is ​​ferrite = 85%, cementite ≤ 2%, phosphorus eutectic ≤ 1%.

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Abstract

The cast state high strength and high extensibility nodular cast iron material consists of C 3.5-3.8 wt%, Si 2.6-31 wt%, Mn not more than 0.3 wt%, S not more than 0.03 wt%, P not more than 0.05 wt%, except Fe. The nodular cast iron material is produced through compounding material, smelting in an electric furnace, nodulizing, inoculation, and casting. It has high tensile strength and high extensibility, and may be used in making parts in driving mechanism and impacted parts in heavy truck.

Description

technical field [0001] The invention relates to a nodular cast iron material and belongs to the technical field of casting materials. Background technique [0002] Due to the improvement of the traffic environment in recent years, heavy-duty vehicles have developed in the direction of large tonnage and high traction force, and the mechanical performance requirements of some transmission parts and impacted parts are getting higher and higher, especially the castings of drive axle housings. High strength and good elongation. Current ductile iron materials are not suitable for heavy-duty auto parts in terms of strength and elongation, and the cost is high. At present, my country's national standards for ductile iron materials include several material grades such as QT400-18, QT450-10, and QT600-3. Heavy-duty auto parts generally use two grades of QT450-10 and QT600-3. The tensile strength of QT450-10 is σ b ≥450MPa, δ≥10%, σ of QT600-3 b ≥600MPa, δ≥3%. Contents of the inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/04B22D3/00
Inventor 侯广怀刘长森
Owner CHINA NATIONAL HEAVY DUTY TRUCK GROUP
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