Steel designation
Steel designation
(OP)
I have recently seen German documentation containing the material designation of '1.7784.5'. The item in question is a high tensile steel bolt. Can someone tell me what designation system this is and where I might find it's material properties on the internet?





RE: Steel designation
C = 0.38-0.43
Si = 0.80-1.00
Mn = 0.20-0.40
P = 0.015 max
S = 0.010 max
Cr = 4.75-5.25
Mo = 1.20-1.40
V = 0.40-0.60
RE: Steel designation
with high Si values. In the
Stahlschlüssel it probably has
the mechanical properties in one
of the sections or equivalent steel
designation.