Initially it was very time consuming to analyze Nb (Cb) separately from Ta so the two elements were included together in the stainless steel stds. Nb (Cb) was always the key element associated with obtaining properties. With more advance chemical analysis methods this distinction is no longer an issue. As Ta is a risk of being a Conflict Mineral and therefore a banned substance, ASTM has been removing Ta from its standards where it has been included in combination with Nb (Cb). This ballot seeks to undertake that in this standard.