Isothermal quenching nodular cast iron as well as preparation method and application thereof

A ductile iron and isothermal quenching technology, which is applied in casting molding equipment, molds, mold components, etc., can solve the problems of easy deformation performance and substandard performance, and achieve the effect of solving the overall performance substandard.

Inactive Publication Date: 2020-04-03
CHINA FIRST AUTOMOBILE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a kind of austempering ductile iron and its preparation method and application. The present invention adopts the integrated design of the axle housing and rationalizes the components of the austempering d

Method used

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  • Isothermal quenching nodular cast iron as well as preparation method and application thereof
  • Isothermal quenching nodular cast iron as well as preparation method and application thereof
  • Isothermal quenching nodular cast iron as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0069] A kind of austempering ductile iron, said austempering ductile iron comprises the following components in weight percentage: C3.60wt%, Si 2.31wt%, Mn 0.22wt%, P 0.017wt%, S 0.013wt%, Cu 0.70 wt%, Mo0.10wt%, Mg 0.035wt%, the balance is iron.

[0070] The preparation method of the austempering ductile iron comprises the following steps:

[0071] (1) The melted molten iron is inoculated by rushing into the spheroidization method, pouring is carried out after the inoculation is completed, and nodular cast iron is obtained after the pouring is completed and cooled; wherein, the addition of the nodularizing agent in the spheroidization inoculation is 1 / 2 of the molten iron quality 1.2%, the nodulizer is Mg 6 RE 2 Rare earth magnesium spheroidizer, particle size 10-30mm; the addition amount of ferrosilicon inoculant in the spheroidization inoculation is 0.6% of the mass of molten iron, and the ferrosilicon inoculant is FeSi 75 Al 1.5-B ferrosilicon, particle size 8-20mm; i...

Embodiment 2

[0075] A kind of austempering ductile iron, said austempering ductile iron comprises the following components in weight percentage: C3.75wt%, Si 2.47wt%, Mn 0.40wt%, P 0.025wt%, S 0.013wt%, Cu 0.80 wt%, Mo0.20wt%, Mg 0.052wt%, and the balance is iron.

[0076] The preparation method of the austempering ductile iron comprises the following steps:

[0077] (1) The melted molten iron is inoculated by rushing into the spheroidization method, pouring is carried out after the inoculation is completed, and nodular cast iron is obtained after the pouring is completed and cooled; wherein, the addition of the nodularizing agent in the spheroidization inoculation is 1 / 2 of the molten iron quality 1.4%, the nodulizer is Mg 6 RE 2 Rare earth magnesium spheroidizer, particle size 10-30mm; the addition amount of ferrosilicon inoculant in the spheroidization inoculation is 0.80% of the mass of molten iron, and the ferrosilicon inoculant is FeSi 75 al 1.5 -B ferrosilicon, particle size 8-2...

Embodiment 3

[0081] A kind of austempering nodular cast iron, the austempering nodular cast iron includes the following components in weight percentage: C3.67wt%, Si 2.41wt%, Mn 0.32wt%, P 0.019wt%, S 0.012wt%, Cu 0.75 wt%, Mo0.15wt%, Mg 0.043wt%, and the balance is iron.

[0082] The preparation method of the austempering ductile iron comprises the following steps:

[0083] (1) The melted molten iron is inoculated by rushing into the spheroidization method, pouring is carried out after the inoculation is completed, and nodular cast iron is obtained after the pouring is completed and cooled; wherein, the addition of the nodularizing agent in the spheroidization inoculation is 1 / 2 of the molten iron quality 1.30%, the nodulizer is Mg 6 RE 2 Rare earth magnesium spheroidizer, particle size 10-30mm; the addition amount of ferrosilicon inoculant in the spheroidization inoculation is 0.70% of the mass of molten iron, and the ferrosilicon inoculant is FeSi 75 al 1.5 -B ferrosilicon, particle...

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Abstract

The invention relates to isothermal quenching nodular cast iron as well as a preparation method and application thereof. The isothermal quenching nodular cast iron is prepared from the following components of, in percentage by weight, 3.60%-3.75% of C, 2.30%-2.50% of Si, 0.20%-0.40% of Mn, less than or equal to 0.06% of P, less than or equal to 0.03% of S, 0.70%-0.80% of Cu, 0.10%-0.20% of Mo, 0.03%-0.06% of Mg, and the balance Fe; and the preparation method of the isothermal quenching nodular cast iron comprises the following steps that (1) nodulizing inoculation is conducted on molten iron by adopting a pouring nodulizing method, pouring is conducted after the inoculation is completed, and after pouring is completed and cooling is conducted, the nodular cast iron is obtained; and (2) thenodular cast iron obtained in the step (1) is sequentially subjected to preheating, austenitizing and salt bath quenching, and the isothermal quenching nodular cast iron is obtained after the salt bath quenching is completed. According to the isothermal quenching nodular cast iron as well as the preparation method and the application thereof, the problems that the performance of an axle housing does not reach the standard and the like when the isothermal quenching nodular cast iron material is used for integrated manufacturing are solved, and efficient utilization of the isothermal quenchingnodular cast iron in the integrated axle housing is achieved.

Description

technical field [0001] The invention relates to the field of nodular cast iron, in particular to an austempering nodular cast iron and its preparation method and application. Background technique [0002] At present, the axle housings used by domestic commercial vehicles mainly include welded axle housings, internal expansion axle housings, ductile iron axle housings, and cast steel axle housings. Among them, cast steel axle housings are generally used on heavy-duty engineering vehicles. This kind of cast steel axle housing is heavy, with a wall thickness of 36-40mm, and the shaft head and steel plate bracket of the axle housing are formed by welding, the manufacturing process is complicated, and there are many oil leakage and shaft head problems during the customer's use. There are technical problems such as deformation after welding. The existing technology in the existing invention indirectly overcomes the above problems, such as a one-time forming axle housing proposed ...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C37/04C22C33/10C21D1/20B22C9/02B60B35/16
CPCB22C9/02B60B35/16C21D1/20C22C33/10C22C37/04C22C37/10Y02P10/20
Inventor 王成刚王建东李锋马顺龙谢文才王林国姜雷
Owner CHINA FIRST AUTOMOBILE
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