Abstract
This paper describes an extensive investigation of the physical properties of specimens cut from various sections of large welding-end valve bodies made of carbon-molybdenum cast steel. Macrosections, impact values, and density determinations are presented in addition to the usual tensile properties.
The results indicate that the welding ends are the soundest part of the valve body and that sections cut from the valve body as close as possible to the welding ends have physical properties commensurate with those obtained from conventional separately and integrally cast test bars.
Evidence of rather general porosity was disclosed by the macrosections from the thicker-walled portions of the bodies and in the bonnet flange, with consequent low ductility values for some of the tensile specimens from these locations. While this condition was considered fairly acceptable when allowance was made for the greater metal thickness in these sections, the investigation showed these to be the regions where improvements could be effected through further development of casting procedure.
