070M55    Technical Data 070M55 is a medium (0.5% to 0.6%) carbon steel. Supplied bright drawn or as rolled 070M55 can be hardened to give a rockwell hardness of up to 55HRc and tensile strenght of between 700 to 1000 n/mm This high surface hardness give 070M55 excellent wear resistance. 070M55 is available from stock in bar and can be cut to your requirements. We also offer 070M55 plate flame cut to your required sizes and normalised. TYPICAL ANALYSIS 070M55  C. Si. Mn. S. P. 0.55% 0.25% 0.70% 0.015% 0.015% Forging: Heat slowly and uniformly to 1100°C. After forging cool slowly. Annealing:  Heat uniformly to 700°C. Soak well and cool slowly in the furnace.  Hardening: Heat uniformly 070M55 to 820/840°C until heated through. Quench in oil, or water. Tempering: Heat uniformly and thoroughly the 070M55 tool at the selected tempering temperature, between 550/660°C and hold at heat for one hour per inch of total thickness.  Hard Chromium Plating: After hard chromium plating, the 070M55 should be tempered for approximately 4 hours at 180°C, in order to avoid hydrogen embrittlement. Welding: Firstly heat to approximately 100-350°C.  Use an unalloyed basic electrode, for welding unalloyed structural steels. Normalising: Normalise at 840-870°C, and cool in air. Stress Relieving: After rough machining 070M55 tools should be stress relieved.  Soaking time 2 hours after the whole piece has attained a temperature of approximately 675°C. Cool in furnace to approximately 500°C, and then freely in air.      070M55 Physical Properties: Density Coefficient of Thermal Expansion Modulus of Elasticity kg/m per c from 20 c N/mm 7800 11.6x10-6 206000     Available sections: