ASTM International

SUPPLEMENTAL REPORT ON THE ELEVATED-TEMPERATURE PROPERTIES OF CHROMIUM-MOLYBDENUM STEELS (An Evaluation of 2 1/4Cr-1Mo Steel)
 N DS6S2

Annotation

ABSTRACT:

This report offers evaluations of elevated temperature strength properties of 2%Cr-lMo steel in various conditions of heat treatment and for diverse product forms. The data evaluated include test results previously included in ASTM Data Series DS 6 (1953) and DS 6S1 (1966), as well as newly generated data gathered by the Metal Properties Council.

The data for wrought material are separated into a number of strength categories corresponding to current specifications for annealed, normalized and tempered, and quenched and tempered grades. Data for castings and for weld-metal are evaluated separately.

Rupture strength and creep strength have been evaluated at two levels, respectively, as the stresses to cause rupture in 10,000 or 100,000 hours and as the stresses corresponding to secondary creep rates of 0.1 and 0.01 percent 1000 hours. The temperature dependencies of these properties as well as of yield strength (0.2 percent offset) and tensile strength are developed in such a form as to be useful for establishing allowable working stresses. Elongation and reduction of area data, although not of direct usefulness in setting stresses, are also included.

The body of the report provides in tables,text, and figures, details concerning the indentification of the individual lots of material, the evaluation procedures, and the results.Several summary figures immediately following this abstract, Figs. 1-5, depict the temperature dependence of important strength properties for a number of grades of practical interest. Figure 6 provides a comparison of the temperature dependence of yield and tensile strength, expressed in the form of strength ratios, for several conditions of heat treatment and product form.