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EN40B  EN40  Technical Data EN40B is a chromium-molybdenum nitriding steel usually supplied in the hardened and tempered condition, which offers high wear resistance together with good toughness and ductility. It is characterised by its suitability for nitriding, which can give a hard wear resistant core in the range of  61-65Rc. The relatively low temperature of the nitriding process produces components with a scale free surface, and minimum distortion.   TYPICAL ANALYSIS   C. Si. Mn. Cr. Mo. 0.25% 0.30% 0.60% 3.25% 0.55% Hardening: Heat uniformly to 880/910°C, soak until heated through. Quench in oil. Tempering: Heat uniformly and thoroughly at the selected tempering temperature, between 570°C to 700°C. Heat Treatment Tensile Strength Rm N/mm² Yield Stress Re N/mm² a% on 5.665ÖSo Impact Izod J Impact KCV J Hardness HB Size mm T 850/1000 650 13 40 35 248/302 >150≤250 T 850/1000 680 13 54 50 248/302 >6≤150 U 925/1075 755 12 47 42 269/331 >6≤150 Available sections: