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Vanadium-titanium ferrite ductile iron automobile hub and production process thereof

A technology for ductile iron and automobile wheel hubs, which is applied in the field of cast iron alloys, can solve the problems of difficulty in obtaining high spheroidization rate, ferrite rate and elongation, interfere with graphite spheroidization, etc. Quantifying the effect of design requirements

Inactive Publication Date: 2014-07-30
陈国
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  • Application Information

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Problems solved by technology

[0003] Due to the strengthening effect of vanadium and titanium, the strength of vanadium-titanium ductile iron is significantly higher than that of ordinary ductile iron, but because vanadium promotes the formation of pearlite, titanium interferes with the nodularization of graphite, making it difficult to obtain high nodularization rate, ferrite rate and elongation

Method used

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  • Vanadium-titanium ferrite ductile iron automobile hub and production process thereof
  • Vanadium-titanium ferrite ductile iron automobile hub and production process thereof
  • Vanadium-titanium ferrite ductile iron automobile hub and production process thereof

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preparation example Construction

[0032] The preparation technology of vanadium-titanium ferrite nodular cast iron automobile hub comprises the following steps:

[0033] 1) Melting the original molten iron: taking vanadium-titanium pig iron, scrap steel, returned charge, recarburizer, and ferrosilicon as charge, the weight percentage of each element in the charge is: C: 3.3-3.6%, Si: 1.5-1.9%, Mn: 0.0%~0.4%, P: ≤0.06%, S: ≤0.05%, V: 0.12~0.18%, Ti: 0.05~0.10%, Cr: 0.0%~0.08%, the balance is Fe and other trace elements and impurities . The charge is melted in an intermediate frequency induction furnace, and after melting, a high-temperature molten iron of 1400-1450°C is obtained, and then the high-temperature molten iron is kept warm for 10 minutes to completely dissolve the carburant, and the maximum melting temperature does not exceed 1450°C;

[0034] 2) Mold preparation: When designing the casting process, the shrinkage rate of the casting is 1.2%. The top pouring gating system is adopted, the edge riser is...

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Abstract

The invention relates to the field of cast iron alloys, and particularly relates to a vanadium-titanium ferrite ductile iron automobile hub and a preparation method thereof. The automobile hub is made of vanadium-titanium ferrite ductile iron, and the vanadium-titanium ferrite ductile iron comprises the following chemical compositions in percentage by mass: 3.3-3.6% of C, 3.0-3.4% of Si, 0.0-0.4% of Mn, less than or equal to 0.06% of P, less than or equal to 0.02% of S, 0.12-0.18% of V, 0.05-0.10% of Ti, 0.0-0.08% of Cr, 0.040-0.060% of RE, 0.040-0.060% of Mg, and the balance of Fe and other trace elements and impurities. The vanadium-titanium ferrite ductile iron automobile hub disclosed by the invention is 550-650 MPa in strength and 12-15% in elongation percentage. Comprehensive properties of the vanadium-titanium ferrite ductile iron automobile hub disclosed by the invention are significantly better than those of common ferrite ductile iron automobile hubs.

Description

technical field [0001] The invention relates to the field of cast iron alloys, in particular to a ferritic nodular cast iron containing vanadium and titanium, specifically a vanadium-titanium ferritic nodular cast iron automobile wheel hub and a production process thereof. Background technique [0002] The hub of a car is a force-bearing part that rotates when the car is running. The inner hole is equipped with a bearing, and the hub acts as a support. It requires high strength and toughness. Automobile hubs are generally made of ferritic nodular cast iron, the commonly used material grade is QT450-10, and its structural performance requirements are: nodularization level 1 to 3, ferrite content ≥ 70%, tensile strength ≥ 450MPa, elongation ≥ 10%. Due to the requirements of energy saving and environmental protection, automotive castings tend to be high-strength to meet the requirements of lightweight design. Therefore, under the condition of meeting the organizational requir...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08B22D1/00C21C1/10
Inventor 陈国武广波万黎陈艳
Owner 陈国
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