St 37.0 is essentially the same as St 37. The Werkstoff Nummer is 1.0254. This grade appeared in DIN 1626, DIN 1629, DIN EN 10216-1 (Draft version), and DIN EN 10217-1 (Draft version). It was also called P235T1. The composition is as follows:
C = 0.17 max
P = 0.040 max
S = 0.040 max
N = 0.009 max