Steels for Piping Systems with Maximum Pressures of 10,000 psi, and Operating Between -150 F and +150 F

摘要

This report presents the results of a survey that was made to find commercially available steels applicable for use in welded high-pressure piping systems. The highpressure piping systems operate at internal pressures of 3,500 to 10,000 psi and temperatures from -150F to +150F. The steel must be capable of being welded with little or no preheat and should be satisfactory for service without a postwelding stress-relief treatment. Two steels, low-carbon 9-percent nickel and HY-80, will meet the requirements for this application. The low-carbon 9percent-nickel steel can be welded with no preheat. Weld joints in the aswelded condition have excellent lowtemperature impact properties, good ductility, tensile strength of approximately 95,000 psi, and yield strength of approximately 60,000 psi. HY-80 steel is welded with a 200F maximum preheat, and it is possible to weld joints that have tensile strength of 130,000 psi and yield strength of 110,000 psi, good ductility, and good low-temperature impact strengths. Thick-walled seamless pipe made from the low-carbon 9-percentnickel-steel pipe is commercially available. HY-80 seamless pipe must be ordered specially. (Author)