EN 10277:2018 standard W.NR.: 1.1189 Non-alloy special steel CHEMICAL COMPOSITION MECHANICAL FEATURES PROPERTIES Heat analysis according to the EN ISO 683-1:2018 standard C % Si % Mn % P % S % Cr % Ni % Mo % Cu % Cr+Mo+Ni % From 0,37 0,10 0,50 – 0,020 – – – – – To 0,44 0,40 0,80 0,025 0,040 0,40 0,40 0,10 0,30 0,63 According to the EN 10277:2018 standard Thickness mm Rolled + peeled rolled ( +SH ) Cold drawn ( +C ) hardness HB Rm (MPa) Rp0,2 minimum Rm (MPa) A5 % (MPa) minimum ≥5≤10 540 da 700 a 1000 6 >10≤16 460 da 650 a 980 7 >16≤40 da 164 a 207 da 550 a 710 365 da 620 a 920 8 >40≤63 da 164 a 207 da 550 a 710 330 da 590 a 840 9 >63≤100 da 164 a 207 da 550 a 710 290 da 550 a 820 9 * Delivery condition: as rolled. Weldability: Due to the medium-high carbon content it can be welded with some precautions. Hardenability: Low hardenability; it shows intermediate features between those of steels with medium and those of steels with high carbon content; therefore it is not easy to obtain the required features by quenching in oil and the quenching in water can result in cracking. Notes: CORRESPONDENCE WITH OTHER STANDARDS ( purely as an indication): UNI 7845 DIN 17200 AISI-SAE AFNOR 35-552 C40 Cm40 1040 XC42H1u C40R-EN.pdf (PDF, opens in a new window)