1 Intermediate values of S and M may be determined by interpolation.
2 For grades of pipe other than those given in this Table, S values may be obtained from ANSI/ASME B31.1 Code for Pressure Piping.
3 Consideration to be given to the possibility of graphite formation in the following steels: Carbon steel above 425°C (800°F); carbon-molybdenum steel above 468°C (875°F); chrome-molybdenum steel (with chromium under 0.60%) above 524°C (975°F).