Crucible for smelting magnesium metal alloy and its preparing method
A preparation process, magnesium alloy technology, applied in crucible furnaces, lighting and heating equipment, furnace types, etc., can solve problems such as difficult to meet magnesium liquid, poor creep resistance, easy oxidation and peeling, etc., to improve room temperature strength , High-temperature strength and high-temperature creep resistance improvement, the effect of improving high-temperature strength and high-temperature creep resistance
Inactive Publication Date: 2008-05-07
TSINGHUA UNIV
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Problems solved by technology
[0004] In the prior art, the crucible is generally made of ordinary carbon steel material. Although the crucible of this material will not pollute the magnesium alloy liquid, the high temperature strength of this material is low. It is difficult to satisfy hundreds of kilograms of magnesium liquid at around 700°C for a long time; at the same time, the material is easily oxidized and peeled off at around 700°C, so the crucible made of ordinary carbon steel has a very short life and poor reliability
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[0016] The embodiment of the present invention adopts the 20 that contains Co 9% # Low-carbon alloy steel is used as the inner layer of the crucible. First, the crucible is formed with a thickness of 20mm; then a layer of 1Cr18Ni9Ti stainless steel with a thickness of 6mm is uniformly surfacing on the outer surface of the formed crucible by argon arc welding. The inner layer is made of cobalt-containing low-carbon alloy steel, and its high-temperature strength and high-temperature creep resistance are increased by 20% and 40% respectively compared with ordinary carbon steel at around 700 °C; when the outer layer is surfacing with a layer of 1Cr18Ni9Ti stainless steel, the crucible The high-temperature strength and high-temperature creep resistance of the carbon steel crucible are increased by 40% to 60%.
[0017] Table 1: 20 with 9% cobalt # Carbon steel high temperature mechanical properties test results
[0018]
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Abstract
A crucible for smelting Mg alloy and its prepn. technology applies double layers metal material, the inner layer is low steel or low alloy steel with Co, the outer layer is stain-less steel of 1Gr18Ni9Ti; the two layers are connected by smelting, so that the inner layer will not pollute Mg alloy liquid at high temp, the intensity at 700 deg.C, and high temp resistance creep deformation performance increase by 20% and 40% separately compared to normal carbon steel; adding small amount of Co to Mg alloy increase its strength and corrosion resistance. The outer stainless steel layer can guarantee the pot will not be oxidized and drop off at high temp.
Description
technical field [0001] The invention relates to a magnesium alloy melting and holding furnace equipment, in particular to a double-layer metal crucible for magnesium alloy melting and a preparation process thereof, belonging to the technical field of alloy melting equipment. Background technique [0002] my country started late in the research of die-casting magnesium alloys, and the supporting melting furnaces for magnesium alloy die-casting mainly depend on imports. Due to the high chemical activity of magnesium and magnesium alloys, magnesium alloy furnaces are very different from aluminum alloy furnaces. In the melting and pouring process of magnesium alloy, in addition to taking appropriate protective measures, the magnesium alloy melting furnace should not only have a sealed structure, but also require the crucible of the magnesium alloy melting furnace to have high temperature strength, strong corrosion resistance, and no pollution to magnesium liquid, etc. features....
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IPC IPC(8): F27B14/10C22C23/00C22C1/02
Inventor 李培杰曹福洋何良菊刘群
Owner TSINGHUA UNIV