Creep Properties of Steels Utilized in High-pressure and High-temperature Superheater and Steam Pipe Practice. Part II: 0·5 per cent Molybdenum Steels *

Abstract

This report deals with the creep properties of carbon-molybdenum steels in the form of a superheater header, superheater tube, and steam pipe manufactured for service at temperatures above about 450 deg. C. (842 deg. F.). The investigation was carried out in a similar manner to that described in Part I (Proceedings, 1944, vol. 151, p. 54) which dealt with carbon steels and, as in the former case, the object was to obtain data for the estimation of the stress-temperature relationships for from 0·1 to 0·5 per cent creep in various periods up to 100,000 hours. It is considered that the data provide a satisfactory basis for design.