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Technical method for producing heat-resisting alloy steel casting below 1000 DEG C

A process method and technology of heat-resistant alloys are applied in the field of heat-resistant alloy steel castings to achieve the effects of wide application, good casting performance and machining performance, and reducing production costs

Inactive Publication Date: 2009-10-21
WUXI YELONG PRECISION MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the above defects, the purpose of the present invention is to provide a process method for heat-resistant alloy steel castings below 1000 °C with good casting performance and machinability and low production cost, so as to solve the problems of the existing process methods. insufficient

Method used

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Embodiment 1

[0008] According to the process method for heat-resistant alloy steel castings below 1000°C described in the embodiments of the present invention, the chemical composition of the alloy steel casting raw materials is: C=0.20%, Cr=19%, Ni=10%, Si =1.2%, Mn=0.7%, P=0.045%, S=0.03%, Nb=1.2%; the microstructure of the material used is composed of austenite and interdendritic chromium carbide, and the process method used includes the following step:

[0009] (1) Put the above raw materials into the bottom of the vacuum furnace in order, put other elemental materials in the material distribution box for use, put the casting mold in a medium temperature furnace at 900°C-950°C for 1-1.5 hours, and take it out quickly Then put it on the iron plate of the vacuum melting furnace;

[0010] (2) Preheat the stainless steel raw material to 200°C-300°C and put it into the induction furnace. After all the furnace materials are melted, add appropriate additive elements for refining. When the te...

Embodiment 2

[0014] According to the process method for heat-resistant alloy steel castings below 1000°C described in the embodiments of the present invention, the chemical composition of the alloy steel casting raw materials is: C=0.48%, Cr=22%, Ni=13.5%, Si = 1.2%, Mn = 1.5%, P = 0.045%, S = 0.14%, Nb = 1.8%; the microstructure of the material used is composed of austenite and interdendritic chromium carbide, and the process method used includes the following step:

[0015] (1) Put the above raw materials into the bottom of the vacuum furnace in order, put other elemental materials in the material distribution box for use, put the mold in a medium temperature furnace at 850°C-950°C for 1-1.5 hours, and quickly take it out Then put it on the iron plate of the vacuum melting furnace;

[0016] (2) Preheat the stainless steel raw material to 100°C-300°C and put it into the induction furnace. After all the furnace materials are melted, add appropriate additive elements for refining. When the...

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Abstract

The invention discloses a technical method for producing a heat-resisting alloy steel casting below 1000 DEG C. The chemical components of the materials of the alloy steel casting are as follows: not less than 0.20 percent and not more than 0.48 percent of C, not less than 19 percent and not more than 22 percent of Cr, not less than 10 percent and not more than 13.5 percent of Ni, 1.2 percent of Si, not less than 0.7 percent and not more than 1.5 percent of Mn, 0.045 percent of P, not less than 0.03 percent and not more than 0.14 percent of S, and not less than 1.2 percent and not more than 1.8 percent of Nb; the microstructure of the adopted materials comprises austenitic and interdendritic chromium carbide. The invention has the advantages of good casting performance and machining performance, significant reduction of production cost and being widely applied to the production of vehicle turbine shells.

Description

technical field [0001] The invention relates to the technical field of preparation of heat-resistant steel castings, in particular to a process method for heat-resistant alloy steel castings below 1000°C. Background technique [0002] Facing the implementation of Euro V emission standards in the automobile industry, the efficiency of automobile engines will be greatly improved, and the exhaust gas temperature of the engine can reach 900°C-1150°C; currently there are heat-resistant alloy stainless steel materials specified in European standards, ASTM standards and ISO standards. Poor casting performance, poor machining and cutting performance, etc., such as automotive engine exhaust system components, are suitable for heat-resistant steel castings at specific temperatures. The existing ferritic stainless steel refers to stainless steel with a chromium content of 11%-30%, a body-centered cubic crystal structure, and a ferritic structure in use; ferritic stainless steel plates ...

Claims

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Application Information

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IPC IPC(8): C22C38/48C22C33/04C21C7/072C21C7/076C21D1/26
CPCY02P10/20
Inventor 罗琪朱瑞卿张良楠
Owner WUXI YELONG PRECISION MACHINERY
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