a 0.5% max. for copper;0.50% max. for nickel;
0.5% max. for chromium;and 0.15% max.
For molybdenum. For grades up to and including X52,
Cu,Cr and Ni shall not be added intentionally.
b For each reduction of o.o1% below the specified max.
Concentration for carbon,an increase of 0.05%
above the specified maxi concentration for manganese
is permissible,up to a max. Of 1.65% for
grades ≥B,but ≤ X52;up to a max.
of 1.75% for grades > X52,but < X70;and up to a max.
of 2.0% for grade X70.
c Unless otherwise agreed,the sum of the niobium and
vanadium contents shall be ≤ 0.06%
d The sum of the niobium,vanadium and titanium concentrations
shall be ≤ 0.15%
e Unless otherwise agreed.
f Unless otherwise agreed,the sum of niobium,vanadium and titanium
concentrations shall be ≤ 0.15%