Home » Tender for The Contract Is For The Supply Of Circles Made Of Heat-resistant Steel Grade 16?12??????-? (??823-?) According To Gost 1133-71, Gost 2590-2006, Gost 14955-77, Tu U 14-131-1126-2013, Tu 14-1-1135-2020. Circles Made Of Heat-resistant Steel Grade 16?12??????, Russian federation