Accuracy: Conversions use linear interpolation between adjacent rows of ASTM E140-12 Table 1 (Non-Austenitic Steels). Results are approximate — the standard itself notes that conversions between scales are inherently imprecise due to differences in measurement method. For critical applications, test in the required scale directly.

Scope: This table applies to wrought non-austenitic steels including carbon steel pipe (A106, A53), low-alloy pipe (A335), and structural steels. Do not use for austenitic stainless steel — use ASTM E140 Table 4 for those materials.