AISI M2 is a high-speed steel with tungsten and molybdenum, standing out for its excellent toughness and optimal cutting characteristics, with resistance to tempering. This steel is supplied in an annealed state with a maximum hardness of 262 HB.
AISI M2, in compliance with ASTM A600-92A:M2, DIN 1.3343 (HS 6-5-2) and JIS SKH 51, is a high speed steel with a specific chemical composition that distinguishes it in the industrial and tool field. , with a carbon content of 0.78% to 0.88%, and the presence of elements such as tungsten, molybdenum and chromium, this steel exhibits unique properties.
The thermal conductivity of AISI M2 is 22.0 W/m °C, and its coefficient of thermal expansion varies in different temperature ranges, it will equate to ASTM A600-92A:M2, DIN 1.3343 (HS 6-5-2) and JIS SKH 51, in its supply condition it is annealed, with maximum hardness of 262 HB (~26 HRC).
This high-speed steel stands out for its good toughness, a fundamental quality in various industrial applications. In addition, it has optimal cutting characteristics, which makes it a preferred choice for cutting tools. Its good resistance to tempering expands its versatility in demanding applications.
For full annealing, temperatures between 770 and 840 °C are recommended, with slow cooling in the furnace. After severe machining, stress relief is recommended, for hardening by transformation to martensite, careful preheating is required, followed by austenization and tempering, with cooling options ranging from warm oil to martensitic salt baths.
The tempering process is crucial to adjust the hardness of AISI M2 steel, it is recommended to perform three temperings with intermediate cooling at room temperature, each with a minimum time of 2 hours, the tempering temperature must be selected according to the desired hardness, tempering is performed immediately after tempering, when the tool reaches a temperature between 50 and 70 ° C, the minimum tempering temperature is 200 ° C. AISI M2 is presented as a versatile and resistant option, standing out for its mechanical properties, heat treatment capacity and adaptability to various industrial and cutting applications.
