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EN19   709M40  Technical Data EN19  is a high quality, high tensile alloy steel usually supplied readily machineable in ‘T’ condition, giving good ductility and shock resisting properties combined with resistance to wear. TYPICAL ANALYSIS   C. Si. Mn. Cr. Mo. 0.40% 0.25% 0.70% 1.20% 0.30% Hardening: Heat uniformly to 820/840°C until heated through. Quench in oil. Tempering: Heat uniformly and thoroughly at the selected tempering temperature, and hold at heat for one hour per inch of total thickness.      Heat Treatment Tensile Strength Rm N/mm² Yield Stress Re N/mm² a% on 5.665ÖSo Impact Izod J Impact KCV J Proof Stress rp0.2 Hardness HB Size mm R 700/850 495 15 34 28 480 201/225 >100≤250 S 775/925 555 13 27 22 540 223/277 >150≤250 S 775/925 585 15 54 50 570 223/277 >63≤150 T 850/1000 680 13 54 50 665 248/302 >29≤100 U 925/1075 755 12 47 42 740 269/331 >13≤63 V 1000/1150 850 12 47 42 835 293/352 >6≤29 W 1075/1225 940 12 40 35 925 311/375 >6≤19