70S-2 is used primarily for single-pass welding of killed, semi-killed, and rimmed steels, but may also be used for some multi-pass applications. Because of the added de-oxidants, Inweld 70S-2 can be used for welding steels that have a rusty or dirty surface, with a possible sacrifice of weld quality depending on the condition of the surface. Typical specifications for these steels are ASTM A36, A285-C, A515-55 and A516-70, which have UNS numbers K02600, K02801, K02001, and K02700, respectively.