Austenite ductile iron with low nickle content and high manganses and chromium content and technology thereof

A technology of ductile cast iron and process method, which is applied in the field of low-nickel, high-manganese, high-chromium austenitic ductile iron and its process, which can solve problems such as easy rust, high alloy hardness, and difficult cutting, so as to save consumption and have strong deoxidation ability , the effect of improving performance

Inactive Publication Date: 2009-02-11
金仕善
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, German patent 683699 reports that when Mn-Ni-Cu austenitic cast iron contains C 2.5-3.5%, Si 2.0-5.0%, Mn 4.0-12.0%, Ni 1.5-8.0%, Cu 0-10.0%, although the remaining A considerable amount of nickel increases the amount of silicon to 5%, and the amount of carbides is still as high as 5%, resulting in high hardness of the alloy, difficulty in cutting, and easy rust

Method used

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  • Austenite ductile iron with low nickle content and high manganses and chromium content and technology thereof
  • Austenite ductile iron with low nickle content and high manganses and chromium content and technology thereof
  • Austenite ductile iron with low nickle content and high manganses and chromium content and technology thereof

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Embodiment 1

[0023] The invention relates to the melting of low-nickel, high-manganese and high-chromium austenitic nodular cast iron. The proportion by weight of each component is: C 1.0%, Si 2%, Mn 11%, Ni 2.5%, Cr 14.5%, Cu 2.7%, and the rest is Fe. Furnace materials include ordinary pig iron, scrap steel (shavings), recycled materials, low-carbon ferromanganese, electrolytic nickel, ferrochrome, electrolytic copper, and 75 ferrosilicon. Iron and 0.6% calcium silicon, stir evenly, pour standard bending test rods and cylindrical castings with precision type 55 (outer diameter) X20 (inner diameter) X85 (height) mm, cool to below 600 ℃ and drop wax to seal sand, cool , as-cast metallographic microstructure see figure 1 , composed of fine A-type graphite flakes, austenite matrix and fine granular carbides, the number of carbides is 1.2%. The fracture of the casting is thin, dense, free of inclusions and non-magnetic.

[0024] Table 1 lists the alloy mechanical properties and austenite th...

Embodiment 2

[0028] The invention relates to the melting of low-nickel, high-manganese and high-chromium austenitic nodular cast iron. The proportion by weight of each component is: C 1.0%, Si 2.2%, Mn 12.5%, Ni 3.8%, Cu 2.0%, Cr 14.5%. Furnace materials include ordinary pig iron, scrap steel (shavings), recycled materials, low-carbon ferromanganese, electrolytic nickel, ferrochrome, electrolytic copper, and 75 ferrosilicon. Ferrosilicon, and then rush into 0.7% calcium silicon with the molten iron flow for instantaneous inoculation. Use precision pouring standard bending test rods and cylindrical castings 55 (outer diameter) X 20 (inner diameter) X 85 (height) mm. Cool to below 600°C to shake out sand and air cool. The fracture of the casting is thin, dense, free of inclusions and non-magnetic. As-cast metallographic structure (see figure 2 ) consists of fine curved A-type graphite flakes, an austenite matrix and fine granular carbides. The amount of carbides is less than 1.2%, even...

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Abstract

The invention relates to a cheap and excellent low-nickel, high-manganese and high-chromium austenitic ductile cast iron and a preparation process thereof. The ductile iron comprises the following components by weight percentages: 0.7-1.5% of C, 1-2.3% of Si, 9-15% of Mn, 2-5% of Ni, 14-17% of Cr, 1-3% of Cu and Fe. The preparation process is as follows: furnace charges adopted comprise common iron, scrap steel (steel scraps), return scraps, low-carbon ferromanganese, electrolytic nickel, ferrochromium, electrolytic copper and 75 ferrosilicon; the charges are melted by an electrical furnace or an intermediate frequency furnace, the tapping temperature is over 1650 DEG C, the ferrosilicon and calcium silicon are added to a casting ladle for modification, wherein, the quantity of the calcium silicon added is 0.5-0.8%. The non-magnetic austenitic ductile iron is applicable to the production of impellers of submersible pumps in the petroleum industry, casing, chemical fittings, water pump bodies, wearable valve gears, seawater corrosion resistant parts, etc.

Description

technical field [0001] The invention relates to an austenitic nodular cast iron and a process method thereof, in particular to a low-nickel, high-manganese, high-chromium austenitic nodular cast iron and a process method thereof. Background technique [0002] At present, copper is usually used to manufacture parts such as valve fittings and nuts, but because copper is expensive, its manufacturing cost is very high. High-alloy austenitic ductile iron has good high-temperature mechanical properties, corrosion resistance and lubricity, and can be used to manufacture valve fittings and nuts and other parts. This alloy is non-magnetic and suitable for the production of various valve equipment. Its wear resistance, resistance The tensile strength has exceeded that of copper, and it is the preferred material to replace copper for valve fittings and nuts. [0003] At present, Ni-Mn series austenitic cast iron has been formed, usually containing 12.0-14.0% nickel and 6.0-7.0% mangan...

Claims

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Application Information

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IPC IPC(8): C22C37/10C22C33/08
Inventor 金仕善
Owner 金仕善
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