EN19 Steel is one steel grade in BS 970-1955 standard, which is specification for wrought steels for mechanical and allied engineering purpose. Although there is new version of BS 970-1996 latest edition. And EN19 steel grade is similar to 709M40 grade in new version.

The EN19 steel equivalent grades are AISI 4140, DIN 1.7225/42CrMo4. There are some difference between all in chemical composition as below:

Standard Grade C Mn P S Si Cr Mo
BS 970-1955 EN19 0.35-0.45 0.50-0.80 0.05 0.05 0.1-0.35 0.9-1.5 0.2-0.4
BS 970-1991 709M40 0.36-0.44 0.7-1.0 0.035 0.04 0.1-0.4 0.9-1.2 0.25-0.35
ASTM A29 4140 0.38-0.43 0.75-1.00 0.035 0.04 0.15-0.35 0.8-1.10 0.15-0.25
EN 10250 42CrMo4/1.7224 0.38-0.45 0.6-0.9 0.035 0.035 0.4 0.9-1.2 0.15-0.30
JIS G4105 SCM440 0.38-0.43 0.60-0.85 0.03 0.03 0.15-0.35 0.9-1.2 0.15-0.30

There are other properties difference between EN19 steel and rest steel grades above. We will compare for details in our blog.