GST high strength toughness seawater corrosion resistant iron casting and its production method

A high-strength toughness, production method technology, applied in the field of corrosion-resistant engineering material production and manufacturing, can solve the problems of high corrosion rate, shrinkage porosity, environmental pollution, etc.

Inactive Publication Date: 2012-02-01
周传禄
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most commonly used corrosion-resistant cast irons in these projects are low-NiGr alloy cast irons, simple alloyed cast irons, etc. The disadvantages of these materials are: 1) The tensile strength is low, generally σ b At about 200MPa, elongation δ 5 0; 2) The corrosion rate in seawater is relatively high, and the annual corrosion rate is ≥0.138mm/a; 3) The production process generally adopts cupola melting and sand casting. Due to the inherent shortcomings of this casting process, there are alloys in the melting process High element burning rate, low recovery rate, serious environmental pollution, segregation of alloy composition and difficult to control accurately, resulting in uneven corrosion resistance of

Method used

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  • GST high strength toughness seawater corrosion resistant iron casting and its production method
  • GST high strength toughness seawater corrosion resistant iron casting and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Use polystyrene foam to process and produce a polystyrene foam model that meets the requirements of the product drawing, complete process 1 to make the white mold, and enter process 2 to paint the lost foam paint on the surface of the white mold. After process 3 is dried and qualified, enter process 4 Packing: Put the dried model into the sand box E, configure the pouring system, add the molding sand D to shake it, and get the mold box F for standby. After that, nickel (Ni) and chromium (Cr) are added, and the smelting temperature is controlled at 1400-1550°C. Manganese (Mn), silicon (Si), and copper (Cu) are added in the later stage of smelting, and rare earth alloys (RE) are added before the furnace is released; enter the process 7 out of the furnace, the temperature of the out of the furnace is controlled at 1400-1460 ℃, inoculated with a strong inoculant (YJ) when out of the furnace, in the inoculation process 8, the mass percentage of the alloy elements of the GST h...

Embodiment 2

[0011] Foam the polystyrene foam beads to make a polystyrene foam model that meets the requirements of the product drawings, assemble the pouring system, complete the white mold production in process 1, enter process 2, and paint the lost foam coating B on the surface of the white mold, and pass the process 3. After passing the drying, enter the process 4 packing: put the dried model into the sand box E, install the molding sand D and shake it, and get the mold box F for standby. The melting process 6 is carried out in the medium frequency induction furnace: put the metal raw material into the furnace Internal smelting, nickel (Ni) and chromium (Cr) are added after melting, the smelting temperature is controlled at 1480-1520°C, manganese (Mn), silicon (Si), and copper (Cu) are added in the later stage of smelting, and rare earth alloy RE is added before the furnace is released ; enter process 7 out of the furnace, the temperature out of the furnace is controlled at 1400-1460 ° ...

Embodiment 3

[0013] Use expandable polystyrene raw materials to make a foam model in the mold that meets the requirements of the product drawing, assemble the pouring system, complete the production of the white mold in process 1, enter the process 2 and paint the paint B on the surface of the white mold, and pass the drying process in process 3 , enter process 4 packing: put the dried model into the sand box E, add the molding sand D to shake it, and get the mold box F for standby, the melting process 5 is carried out in the intermediate frequency induction furnace: put the metal raw material into the furnace for melting, melt After that, nickel (Ni) and chromium (Cr) are added, and the smelting temperature is controlled at 1480-1520°C. Manganese (Mn), silicon (Si), and copper (Cu) are added in the later stage of smelting, and rare earth alloys (RE) are added before the furnace is released; enter the process 6 out of the furnace, the temperature of the out of the furnace is controlled at 1...

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Abstract

The invention relates to a GST high strength toughness sea water corrosion resistant iron casting which is a low nickel chromium alloy iron casting, comprising a seawater or sewage waterborne engineering gate, a gate slot embedded part, parts such as trash screens, a seawater or sewage pump housing, an impeller, conveying pipelines, a pipe fitting, a valve and the like. The tensile strength of the iron casting is greater than or equal to 450MPa, its elongation percentage is greater than or equal to 5% and its corrosion speed in seawater is less than or equal to 0.10mm/a; The mass percent of iron casting alloy elements is as follows: 2.80-3.60 of C, 1.60-2.60% of Si, 0.40-1.2% of Mn, 0.80-1.8% of Cr, 0.8-3.2% of Ni, 0.6-1.5% of Cu and the balance being Fe. According to the invention, technologies of intermediate frequency induction furnace melting, compound reinforced inoculation and lost foam casting are adopted to obtain the GST high strength toughness seawater corrosion resistant iron casting with uniform chemical component and microstructure as well as excellent mechanical properties.

Description

technical field [0001] The invention relates to a GST high-strength toughness seawater corrosion-resistant cast iron and a production method thereof, belonging to the field of production and manufacture of corrosion-resistant engineering materials. Background technique [0002] Seawater hydraulic projects, seawater desalination projects, coastal thermal power projects, coastal nuclear power projects, sewage treatment projects, etc. need to use a large number of corrosion-resistant alloy cast iron materials, such as gates, door slot embedded parts, and trash racks of seawater or sewage hydraulic projects Components such as seawater or sewage pump shells, impellers, conveying pipes, fittings, valves, etc. At present, the most commonly used corrosion-resistant cast irons in these projects are low-NiGr alloy cast irons, simple alloyed cast irons, etc. The disadvantages of these materials are: 1) The tensile strength is low, generally σ b At about 200MPa, elongation δ 5 0; 2) T...

Claims

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Application Information

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IPC IPC(8): C22C37/08C22C33/08
Inventor 周传禄姜洪军肖燕鹏袁堂伟尹晏生
Owner 周传禄
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