Excels in long wear and edge-holding ability It is the outstanding cold-work tool and die steel for maximum production. D2 – Combines minimum size change during heat-treatment with the ultimate in wear-resistance.A10 can be hardened over 60 Rockwell C from a relatively low hardening temperature, which minimizes size change and distortion during heat treatment. The graphite particles make the steel self -lubricating in dry environments, and help to retain oil in lubricated environments. The steel contains a uniform dispersion of graphite particles, which impart excellent machinability and non-seizing characteristics. A10 – An air-hardening graphitic tool steel with outstanding resistance to metal-to-metal sliding wear and calling.The combination of toughness and wear resistance make A8 tool steel an excellent choice for application which require higher toughness than that of the high-carbon, high-chromium steels such as D2 and better wear resistance than that of shock resisting steels such as S7. A8 tool steel is an excellent steel for punches and dies that operate in the 55 to 60 rockwell C hardness range. A8 – An air-hardening tool steel that is characterized by a combination of very good toughness, intermediate wear resistance, and excellent dimensional stability in heat treatment.Because of its low austenitizing temperature and air-hardening characteristics, A6 has excellent dimensional stability. A6 – A low-alloy chromium-molybdenum air-hardening tool steel with a combination of toughness, strength,and wear resistance that makes it an excellent choice for general-purpose cold work tools and dies.Its ability to hold a keen cutting edge, resistance to abrasion and wear, and deep-hardening properties, A2 exceeds the regular oil-hardening grades. It is safer in hardening and has less distortion in heat-treating than the oil-hardening types. A2 – A medium-alloy, air-hardening tool steel.