Have been measured in the past is dissolved in the melt of the amount of hydrogen by vacuum test method, which is the process of injecting the sample melted aluminum recycling steel scrap brass cup Shandong, and it solidified in a vacuum chamber. Observe the solidification process found during solidification bubble level change indicates the amount of hydrogen present. Use a sample slice after solidification can check the size of the formation of bubbles. Unfortunately, the market prices of scrap brass, these methods are not accurate, and greatly affected the melt hydrogen bubble nuclei exist as oxide particles. Test dissolved hydrogen better approach is to use a liquid extraction technology specially designed display of hydrogen equipment. A) crucible cast aluminum alloy commonly used iron crucible, can also be cast and welded steel crucibles. New and old crucible crucible long unused, before use shall blow, and heated to 700--800 price of scrap brass and maintain 2--4 hours to burn off moisture and flammable substances attached to the inner wall of the crucible When leave to cool to below 300 degrees, carefully clean the crucible wall, spray paint at a temperature of not less than 200 degrees. Crucible before use should be preheated to dark red (500 - 600 degrees), and incubated for more than two hours. Before the new crucible melting outside, it is best to melting furnace with a grade back charge. (B) Prepare bell smelting tools, pressure scoop, mixing spoons, ladles, etc. ingot mold should be preheated before use scrap brass, and at 150 degrees --- 200 degrees temperature coated with a protective coating, and thoroughly drying, drying temperature is 200--400 degrees, more than two hours holding time, should be completely removed after use on adhering to the surface oxides, fluorides, (preferably carried out blowing sand). Brass scrap, brass scrap latest offer, Shengxin scrap metal recycling (quality businessmen) recovered from the Linyi City Shengxin scrap metal Limited. Linyi City Shengxin scrap metal recycling Ltd. (shengxin.tz1288.com) is specialized in "scrap metal, alloy, machine aluminum, brass, wine together, miscellaneous aluminum, copper ash, zinc ash, zinc scrap" of the enterprise, the company Adhering to the "honesty, hard service" concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Zhu new.