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Screw alloy for double-screw air compressor and preparation method of screw alloy

An air compressor and twin-screw technology, which is applied in the direction of mechanical equipment, manufacturing tools, heat treatment equipment, etc., can solve the problem of poor wear resistance, corrosion resistance and high temperature resistance, and cannot meet the requirements of the main screw of the screw air compressor. Requirements and other issues, to achieve excellent mechanical properties, improve service life, and good corrosion resistance

Active Publication Date: 2014-11-05
上海施耐德日盛机械集团科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it has high wear resistance and toughness, it does not have corrosion resistance and high temperature resistance, and cannot meet the working requirements of the main screw of the screw air compressor.
[0005] Chinese patent application number: 200910212110 discloses a nickel-based alloy for steam turbine forged parts, rotor blades, stator blades, screw members and tubes, in weight %, which includes: although having excellent high temperature strength, forgeability and Welding performance, but the wear resistance is poor, and it cannot meet the working requirements of the main screw of the screw air compressor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Formula: weight percentage:

[0022] C: 3.66, Si: 2.46, Mn: 0.554, S: 0.0138, P: 0.0312, Mg: 0.0381, Ce: 0.00765, La: 0.00619, Zr 0.0105, Cu: 0.0122, Cr: 0.0438, Sn: 0.0299, Mo: 0.00361 , Ni: 0.0177, B: 0.00124, Ti: 0.0349, Al: 0.0159, Pb: 0.001, Zn: 0.00275, Sb: 0.00357, and the balance is Fe.

[0023] Preparation:

[0024] (1) Melting in an electric arc furnace and then using vacuum solid casting. When pouring is started, the mold temperature is 320℃, and the pouring temperature is 2000℃. After pouring, it is cooled to 100℃ and demoulded;

[0025] (2) Heat the product obtained in step (1) in an inert atmosphere to 970~1000℃, keep it for 5 hours, cool it to 800℃ with the furnace, keep it for 10 hours, take it out of the furnace, quench the oil, and cool it to 350 in oil ℃, take it out, and cool to room temperature naturally;

[0026] (3) Place the product of step (2) in an annealing furnace, heat it to 650°C, keep it warm for 4 hours, cool it to 450°C with the furnace, take it...

Embodiment 2

[0034] Formula, weight percentage:

[0035] C: 3.66%, Si: 2.46%, Mn: 0.554%, S: 0.0138%, P: 0.0312%, Mg: 0.0381%, Ce: 0.00765%, La: 0.00619%, Cu: 0.0122%, Cr: 0.0438%, Sn: 0.0299%, Mo: 0.00361%, Ni: 0.0177%, B: 0.00124%, Ti: 0.0349%, Al: 0.0159%, Pb: 0.004%, Zn: 0.00275%, Sb: 0.00357%, and the balance is Fe.

[0036] Preparation:

[0037] (1) Use electric arc furnace smelting, and then use vacuum solid casting. When pouring is started, the mold temperature is 305℃, and the pouring temperature is 1900℃. After pouring, it is cooled to 80℃ and demoulded;

[0038] (2) Heat the product obtained in step (1) in an inert atmosphere to 970℃, keep it for 3~hours, cool it to 730℃ with the furnace, keep it for 7 hours, take it out of the furnace, quench the oil, and cool it in oil to 310~310~ ℃, take it out, and cool to room temperature naturally;

[0039] (3) Place the product of step (2) in an annealing furnace, heat it to 600°C, keep it for 2 hours, cool it to 400°C with the furnace, take it o...

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PUM

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Abstract

The invention relates to a screw alloy for a double-screw air compressor and a preparation method of the screw alloy. The screw alloy comprises the following components in percentage by weight: 3.10-3.80 percent of C, 1.75-2.50 percent of Si, 0.160-0.815 percent of Mn, 0.0030-0.0077 percent of Ce, 0.0024-0.00619 percent of Ce, 0.011-0.062 percent of Cu, 0.0289-0.113 percent of Cr, 0.0020-0.00698 percent of Mo, 0.0156-0.0259 percent of Ni, 0.0336-0.0530 percent of Ti and the balance of Fe. The screw alloy disclosed by the invention is an iron-based alloy containing rare earth and is excellent in mechanical property, resistant to high temperature and abrasion and favourable in corrosion-resistance performance; and the service life of a screw of the air compressor can be greatly prolonged.

Description

Technical field [0001] The invention relates to a screw material for a twin-screw air compressor, in particular to an iron-based alloy containing rare earths. Background technique [0002] As we all know, air compressor is a kind of machinery with very wide application, including air compressor main engine and driving machinery. Among them, the screw of the air compressor is one of the most critical components, and its performance directly affects the efficiency and service life of the compressor. [0003] At present, the screws in the main body of conventional screw air compressors are all ordinary cast iron, which has poor mechanical properties. It is difficult to apply to large compressors, such as large compressors above 100KW. [0004] Chinese Patent Application No. 011397551 discloses a vanadium wear-resistant alloy cast iron used for extruding screws of wallboard extruders. The composition is (%): C: 2.30~3.20, Cr: 12.0~22.0, V: 2.0~6.0 , Mo: 1.0~2.5, Ni: ≤1.5, Cu: ≤1.5, Mn≤...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/56C22C37/08C21D9/00F04C18/16
Inventor 杨春钱
Owner 上海施耐德日盛机械集团科技有限公司