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A kind of ferritic heat-resistant cast steel and its preparation method and application

A heat-resistant cast steel and ferrite technology, applied in the field of cast steel materials, can solve the problems of unstable mechanical properties and small elongation, improve thermal fatigue performance and high temperature oxidation resistance, improve structure, and improve comprehensive performance effect

Active Publication Date: 2017-07-07
CRRC QISHUYAN INSTITUTE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The content of chromium, aluminum and manganese in this cast steel material is relatively high, and a certain amount of vanadium is added, so the mechanical properties are not stable and the elongation rate is small

Method used

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  • A kind of ferritic heat-resistant cast steel and its preparation method and application
  • A kind of ferritic heat-resistant cast steel and its preparation method and application
  • A kind of ferritic heat-resistant cast steel and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1）

[0059] The alloy composition and mass percentage of the ferritic heat-resistant cast steel of this embodiment are C: 0.17%, Si: 0.89%, Mn: 0.46%, P: 0.013%, S: 0.11%, Cr: 13.71%, Ni: 1.3%, N: 0.056%, Re: 0.01%, Nb: 0.51%, Al: 0.10%, the balance is iron and inevitable impurities.

[0060] The method for preparing the ferritic heat-resistant cast steel of this embodiment includes the following specific steps:

[0061] A. Alloy melting.

[0062] According to the composition and content of the alloy, the bottom slag is charged into the furnace first, and then 0.1% recarburizer, 74.33% steel scrap, 1.34% nickel plate, 22.2% ferrochromium, and 0.81% ferro-niobium are charged into the furnace. After the molten steel is completely melted, the slag is removed and new slag is created. When the temperature of the molten steel rises to 1540℃, 0.15% of ferromanganese is added for pre-deoxidation. The surface of the molten steel is covered and insulated and the spectral composition is quickly ana...

Embodiment 2）

[0071] The alloy composition and mass percentage of the ferritic heat-resistant cast steel of this embodiment are C: 0.20%, Si: 1.29%, Mn: 0.48%, P: 0.013%, S: 0.089%, Cr: 13.36%, Ni: 1.25%, N: 0.059%, Re: 0.041%, Nb: 0.57%, Al: 0.08%, the balance is iron and inevitable impurities.

[0072] The method for preparing the ferritic heat-resistant cast steel of this embodiment includes the following specific steps:

[0073] A. Alloy melting.

[0074] According to the composition and content of the alloy, the bottom slag is charged into the furnace first, and then 0.12% recarburizer, 74.25% steel scrap, 1.29% nickel plate, 21.64% ferrochrome, and 0.91% ferroniobium are charged into the furnace. After all the molten steel is melted, the slag is removed and new slag is produced. When the temperature of the molten steel rises to 1540℃, 0.18% ferromanganese is added for pre-deoxidation. The surface of the molten steel is covered and insulated and the spectral composition is quickly analyzed. ...

Embodiment 3）

[0083] The alloy composition and mass percentage of the ferritic heat-resistant cast steel of this embodiment are C: 0.21%, Si: 1.15%, Mn: 0.49%, P: 0.021%, S: 0.086%, Cr: 13.18%, Ni: 1.18%, N: 0.051%, Re: 0.07%, Nb: 0.73%, Al: 0.09%, the balance is iron and inevitable impurities.

[0084] The method for preparing the ferritic heat-resistant cast steel of this embodiment includes the following specific steps:

[0085] A. Alloy melting.

[0086] According to the composition and content of the alloy, the bottom slag is first charged into the furnace, and then 0.09% recarburizer, 68% heat-resistant cast steel return charge, 24.95% steel scrap, 0.51% nickel plate, 5.59% metal chromium, 0.42% ferro-niobium is charged into the furnace, and after all is melted into molten steel, slag is removed and new slag is produced. When the temperature of molten steel rises to 1540℃, 0.1% ferromanganese is added for pre-deoxidation. The molten steel surface is covered and insulated and the spectral co...

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Abstract

The invention relates to ferrite heatproof cast steel and a preparation method thereof. The preparation method includes steps of melting an alloy, tapping molten steel, casting and performing thermal treatment. The alloy comprises following components by weight: 0.10-0.25% of C, 0.6-1.5% of Si, 0.2-0.6% of Mn, not more than 0.05% of P, 0.03-0.12% of S, 12-13.9% of Cr, 0.8-1.35% of Ni, 0.01-0.06% of N, 0.01-0.1% of Re, 0.15-3.0% of Nb and 0.01-0.8% of Al, with the balance being iron and unavoidable impurities. The ferrite heatproof cast steel has good high-temperature oxidation resistance, high-temperature fatigue resistance, good room-temperature toughness, and a low production cost and is suitable for producing components and parts of engine emission systems.

Description

Technical field [0001] The invention relates to a cast steel material and a production method and application of the cast steel, in particular to an exhaust system zero for the production of exhaust manifolds, volutes, and conjoined volute exhaust manifolds for automobile engines. Heat-resistant nodular cast steel for components. Background technique [0002] With the increasingly stringent global requirements for energy conservation and emission reduction, the energy conservation and environmental protection of automobile engines will face higher challenges and need to meet more stringent requirements. Exhaust system components such as exhaust manifolds are key components of automobile engines, and their quality directly affects the service life and emission performance of the engine. At present, in order to meet the requirements of energy saving and emission reduction, the exhaust temperature of the engines of high-end automobile manufacturers at home and abroad needs to be ab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/60C22C33/04C21D6/00
CPCY02P10/20
Inventor 喻光远徐贵宝魏冬冬龚家林王思千张剑云白云
Owner CRRC QISHUYAN INSTITUTE CO LTD
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