Abstract
From wide experience with various metals and applications of different types, in high-pressure, high-temperature power-plant service, the authors have selected piping and bolting materials for detailed discussion. In this field, carbon-molybdenum steel is receiving the greatest amount of attention and so the properties, control of grain size, heat-treating practice, creep rates, and kindred matters for this material are dealt with in the paper. Based on two specifications for bolting material issued by the American Society for Testing Materials, the authors discuss the selection of properties, heat-treatment practice, and causes of failure in this type of material. The conclusion is reached that in so far as suitable alloys for pipes and bolts for high temperature are concerned, the art is yet in its developmental stage.
