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655M13    Technical Data 655M13 is an alloy case hardening steel. Characteristics of the 655M13 steel specification are toughness arising from the use of nickel and a more uniform hardness produced by the use of chromium. 655M13 is specifically designed for carburising to give a very hard case with a strong core.   TYPICAL ANALYSIS  655M13 C. Si. Mn. Ni. Cr. 0.15% 0.25% 0.50% 3.50% 0.90%   Heat Treatment - Carburising Temperature Heat to 890°C/920°C and soak for the necessary time to obtain the desired carburised depth.   Single Quench Treatment: Heat the carburised 655M13 parts to 800/820°C and quench in oil. Double Quench Treatment: Heat the carburised 655M13 parts to 850/880°C, cool in oil or air then re heat to 760/780C and quench in oil. Tempering: After hardening temper at 150°C for 2 hours minimum, and allow to cool in air to give the 655M13 tool a final surface hardness in the region of Rockwell C60/62.  Condition Tensile Strength Rm N/mm² Elongation % 5.665ÖSo Impact Izod J Impact KCV J Hardness HB Test Piece Size mm BC Blank Case Hardened 655M13 1100 9 40 35  341 19        Available sections: