EN24 and 4340 are equivalent steel grades. Here we compare briefly between EN24 vs 4340 alloy steel:

  1. Different Standard EN24 vs 4340

EN24 steel is steel grade in standard BS 970-1955. Its equivalent steel grade is 817M40 steel grade in BS 970-1991. Steel 4340 is one steel grade in ASTM A29 standard.

  1. Chemical Composition Difference EN24 vs 4340
Standard Grade C Mn P S Si Ni Cr Mo
ASTM A29 4340 0.38-0.43 0.60-0.80 0.035 0.040 0.15-0.35 1.65-2.00 0.70-0.90 0.20-0.30
BS 970 EN24
817M40		 0.36-0.44 0.45-0.70 0.035 0.040 0.1-0.40 … 1.00-1.40 0.20-0.35
  1. Some other equivalent of EN24 and 4340 steel

There are other steel equivalents for this two steel grades. 36CrNiMo4 or 1.6511 steel grade in EN10250 and SNCM439 or SNCM8 steel grade in JIS G4103 standard.

We could also deliver you special modified EN24 or 4340 steel materials according to your various requirements. Just contact us for further technical advice and request one offer of EN24/4340 alloy steel anytime.