Copper (Cu) – reddish, extremely ductile metal that is an unusually good conductor of electricity and heat. Copper is found in the free metallic state in nature. This native copper was first used (c. 8000 bce) as a substitute for stone by Neolithic (New Stone Age) humans. The pure metal is second only to silver in thermal and electrical conductivity.
Progress Consulting Eesti Osaühing trade in copper and copper alloy products, scrap copper. We buy copper scrap of different grades, copper anodes and anodes slimes.
Aluminum (Al) – lightweight, silvery-white metal. Aluminum is the most abundant metallic element in Earth’s crust and the most widely used nonferrous metal. Because of its chemical activity, aluminum never occurs in the metallic form in nature, but its compounds are present to a greater or lesser extent in almost all rocks, vegetation, and animals. The metal and its alloys are used extensively for aircraft construction, building materials, consumer durables (refrigerators, air conditioners, cooking utensils), electrical conductors, and chemical and food-processing equipment. Aluminum is an excellent conductor of heat and electricity. Its thermal conductivity is about one-half that of copper; its electrical conductivity, about two-thirds.
Progress Consulting Eesti Osaühing trade in aluminum secondary alloys. We buy scrap aluminum of different grades.
Stainless steel – any one of a family of alloy steels usually containing 10 to 30 percent chromium. In conjunction with low carbon contents, chromium imparts remarkable resistance to corrosion and heat. Other elements such as nickel, molybdenum, titanium, aluminum, niobium, copper, nitrogen, sulfur, phosphorus, and selenium may be added to increase corrosion resistance to specific environments, enhance oxidation resistance, and impart special characteristics. There are three major groups in the family of stainless steels: austenitic, ferritic, and martensitic.
Progress Consulting Eesti Osaühing trade in various types of stainless steel products. We buy scrap stainless steel of different grades.
