STAS 791
STAS 791 (Alloy steels for heat treatment, for machine-building industry. Grades and technical requirements for quality)· STAS (Rumunia) · 111 materiałów
STAS 791 (Alloy steels for heat treatment, for machine-building industry. Grades and technical requirements for quality)· STAS (Rumunia) · 111 materiałów