Copper and Copper Alloys

TABLE A3.8 Copper and Copper-Based Pipe and Tubing Alloy Specifications

The use of copper and copper alloys is limited to temperatures below the lower recrystallization temperature for the particular alloy. This is the temperature at which cold-worked specimens begin to soften. This recrystallization is usually accompanied by a marked reduction in tensile strength. Typical classes of wrought copper based materials are given in Table A3.7.

Brasses containing 70 percent or more of copper may be used successfully at temperatures up to 400_F (200_C), while those containing only 60 percent of copper should not be used at temperatures above 300_F (150_C). The ASME Boiler and Pressure Vessel Code limits the use of brass and copper pipe and tubing (except for heater tubes) to temperatures not to exceed 406_F (208_C). The ASME B31 Code for Pressure Piping also limits brass and copper pipe and tubing to this temperature for steam, gas, and air piping. Table A3.8 lists a number of ASME specifications for copper and copper alloy piping and tubing. Tomorrow we will continue with Nickel and Nickel Alloy and still with Piping & Fabrication.