Alloy composition suitable for molten magnesium environments
a technology of alloy composition and molten magnesium, which is applied in the field of alloy composition suitable for molten magnesium environments, can solve the problems of ceramic to shatter in a relatively short time, shafts tend to have a short life, and conventionally have a relatively short life, so as to reduce the pick-up of alkalides, and high tensile strength
Inactive Publication Date: 2005-09-22
MORANDO JORGE A
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Benefits of technology
"The present invention provides an alloy that can be used to make components that can be used in molten melts containing magnesium. The alloy has high strength and can withstand immersion in molten metal baths for extended periods of time. The alloy also has low pick-up of alkalides during clean-up after a remelt. The technical effects of the invention include improved durability and resistance to corrosion in molten melts, as well as reduced risk of contamination during the manufacturing process."
Problems solved by technology
Equipment used for moving and transferring metals in a bath of molten metal, conventionally have a relatively short life because of the destructive effects of the molten metal on the components contacting the molten metal.
Such shafts tend to have a short life because the steel is chemically attacked by the molten metal.
If the steel shaft is shielded by a protective coating of a ceramic material, the different thermal-expansion characteristics of the steel and the ceramic tend to cause the ceramic to shatter in a relatively short time.
Parts made of graphite rather than steel tend to burn at the metal surface.
Pure ceramic components do not have sufficient tensile torque or impact strength to overcome the stresses normally encountered when utilized in molten metals.
Cast iron and mild steel are not formulated specifically for these applications and consequently lack the properties to meet the operational needs.
Pumps that operate over 1000 RPM tend to generate excessive vibration and damage to the bearings and holding equipment when dimensional stability is low.
Method used
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[0121] An alloy was prepared having the following composition:
ELEMENTCONTENT (weight %)Boron0.20-0.30Carbon0.50-0.60SulphurtracePhosphorustraceChromium10.0-11.0Siliconless than 0.80Molybdenum6.00-7.00Tungsten3.00-3.5 Vanadium2.00-2.40Niobium2.80-3.20Cobalt4.00-4.50IronBalance
[0122] The alloy has good hardness, RM, tensile strength, and compression characteristics. Table 1 compares some of these properties with those of cast iron.
TABLE 1Tensile StrengthHard-(KSI)CompressionSamplenessRM1000° F.1300° F.Elong.Yield (KSI)Cast IronB160231520Cast IronB220453840AlloyC365880652.583.5
[0123] In addition, the alloy performed well in solubility testing. In one test, a sample of the material was subjected to the following regimen: [0124] Two weeks in a molten metal bath comprising 93% Mg and 6% Al; [0125] Four weeks frozen in the same bath, followed by a remelt of the bath; and [0126] Two weeks in the bath following remelt.
[0127] The sample held up well at the melt line, even during a freeze...
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Abstract
A castable and machinable alloy suitable for submersion in a molten magnesium or magnesium aluminum melt has the following composition: ELEMENTCONTENT (weight %)Boron0.01-2.0 Carbon0.01-2.0 SulphurTracePhosphorusTraceChromium 5.0-15.0Silicon0.0-2.0Molybdenum 2.00-12.00Tungsten 0.5-10.00Vanadium0.5-5.0Niobium0.5-5.0Cobalt 0.5-10.0IronBalanceThe alloy is resistant to dissolution by the melt at temperatures of up to around 1800° F.
Description
BACKGROUND OF THE INVENTION [0001] The present invention relates to the metal processing arts. It finds particular application in conjunction with mechanical equipment for moving or pumping metals, such as magnesium, aluminum, and zinc, in a bath of molten metal, and will be described with particular reference thereto. An alloy is provided which is particularly suited to forming components for use in magnesium and magnesium / aluminum baths for refining of magnesium, at temperatures up to around 1800° F. Such components include, for example, pumps, tubing, ladles, troughs, rolls, drivers, furnace, equipment, risers, and the like. It should be appreciated, however, that the invention is also applicable to a variety of metal processing industries in which the processing equipment is submerged in a bath of molten metals. [0002] Baths of molten metals, such as magnesium, zinc, and combinations of magnesium and aluminum or zinc and aluminum are widely used in the metal processing industrie...
Claims
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IPC IPC(8): C22C38/22C22C38/24C22C38/26C22C38/30C22C38/32C22C38/34C22C38/36C23C2/00
CPCC22C38/22C22C38/24C22C38/26C23C2/00C22C38/32C22C38/34C22C38/36C22C38/30
Inventor MORANDO, JORGE A.
Owner MORANDO JORGE A