  According to standards Number   0,550,62   0,150,40  (DIN 17221)   0,701,10   1050850  for the springs 680720 furnace cooling (HB max 248)    max 0,035  max 0,035   0,901,20   TECHNICAL CARD GRUPPO LUCEFIN  REVISION 2014 ALL RIGHTS RESERVED     0,100,20   850880 air   830850 oil or polymer   480650 air   150200 air  for the springs 820850 oil or polymer  for the springs 430500 air     (HB ~ 310)   680720 furnace cooling (HB max 248)   not allowed      mechanical properties after QT. Stahlschlűssel 2010 size Testing at room temperature (longitudinal) mm  0.2 % from to N/mm2 N/mm2 min. min. 16 13201570 1080 7 17 40 11801370 980 8 41 100 10801270 885 10 101 160 9801180 735 12 161 250 9801180 735 12 % min. 40 45 50 55 55  J min. 21 27 34 41 41               Values for  according to Stahlschlűssel 2010 size Testing at room temperature (longitudinal) mm  0.2 % to N/mm2 N/mm2 min. min. round 50 15001700 1350 6 flat 30 15001700 1350 6 % min. 35 35  J min. 14 14                      values obtained at room temperature on round of Ø 16 mm after quenching at 840 °C in oil   468 421 384 353 315 271   49 45 41 38 33 28  N/mm2 1700 1480 1320 1180 1040 900 2 0.2 N/mm  1600 1380 1210 1060 920 780  % 36 40 44 50 56 62  % 5 8 8 9 9 10 Tem.           Hardenability values, for information distance from quenched end mm 2 4 8      EN  UNI  GB 12   DIN 58CrV4 16  20  28    AFNOR 58CV4 B.S. 32  36   GOST 40  50   AISI/SAE 6158 The data contained herein are intended as reference only and are subject to constant change. Lucefin s.P.A. Disclaims any and all liability for any consequences that may result from their use.