JIS SKH59 AISI M42 SS 2617のツイスト ドリル、SGS BVのための製粉の表面が付いている高速工具鋼

JIS SKH59 AISI M42 SS 2617 High Speed Tool Steels with Milling Surface for Twist Drills , SGS BV Descrition: E M42 is a highly cobalt alloyed high speed steel to be used when the demand for hot hardness is of great importance. E M42 has a good machinability and a good wear-resistance. Heat Treatment Soft annealing in a protective atmosphere at 850-900C, for 3 hours, followed by slow cooling at 10 C per hour down to 700 C, then air cooling. Stress-relieving at 600 C to 700 C