| 摘要 |
FIELD: alloyed tool steels for manufacture of parts by powder metallurgy method; tools for cold metal working. SUBSTANCE: proposed alloyed tool steel is used for manufacture of parts by powder metallurgy method. Proposed steel contains the following components, mass-%: carbon, 2.05-2.65; silicon, up to 2.0; manganese, up to 2.0; chromium, 6.10-9.80; tungsten, 0.50- 2.40; molybdenum, 2.15-4.70; vanadium, 7.0-5-9.0; niobium, 0.25-2.45; cobalt, up to 10.0; sulfur, up to 0.3; nitrogen, 0.04-0.22; nickel, up to 1.50; accompanying elements, up to 2.6; iron and technological admixtures being the remainder. Content of oxygen is lesser than 100 part per million. Proposed method includes preliminary refining of steel melt, spraying with nitrogen at degree of 99.999%, placing the powder in capsule and sealing this capsule, hot iso-static molding of powder followed by hot deformation. EFFECT: enhanced bending strength; enhanced wear resistance. 4 cl, 6 dwg, 2 tbl |
