The Temperature Coefficient of Copper (near room temperature) is +0.393 percent per degree C. This means if the temperature increases 1°C, the resistance will increase 0.393%. Alloy Steel Heat Treating. Get the Copper Price trading chart live on the website Please give any information on the copper, its initial condition (any anti-tarnish treatment or varnish), shape and finish, and the suspected temperature, time and atmosphere of heating. Interactive chart of historical daily COMEX copper prices back to 1971. Heat Treatment Hardness vs Temperature Table Chart. Application Data Sheet: Mechanical Properties of Copper and Copper Alloys at Low Temperatures Publist#: 144/8. Is the oxide translucent or opaque? Copper Prices - 45 Year Historical Chart. The current price of copper as of November 23, 2020 is $3.26 per pound. Copper, chemical symbol Cu, is a shiny, red-orange metal that has a wide range of applications. This standard defines the terminology of the processes responsible for the production of tempers and it also based on the occurrence of changes within the product during these processes. The price shown is in U.S. It takes a pretty high temperature (e.g., 400 °C) to form a visible black layer. They also retain excellent impact resistance to 20 K. Related. Copper futures crossed $3.3 per pound for the first time since February 2014, supported by optimism surrounding a coronavirus vaccine, growing demand from top consumer China and a decline in Chile's production. The industrial sector in China, the world’s top consumer of industrial metals, grew more than expected in October and in line with September’s 9-month high. Engineering Materials Applications & Design. Carbon Steel Typical Heat Treatment. The effect of carbon content on the hardness of tempered carbon steel. Dollars per pound. Heat Treatment Hardness vs Temperature. Temper designations for copper alloys and copper products are indicated by the standard ASTM B601. Copper alloys become stronger and more ductile as temperature goes down. Examples: You have 100 feet of 20 gauge wire and its resistance is 1.015 ohms at 20° C (room temp).