Ductile Iron 65-45-12 in China
65-45-12 is the material grade of
ductile iron ANSI / ASTM A536
65-45-12. This grade has higher tensile strength but lower
The followings are its physical, chemical properties and its
Tensile strength min. 448 Mpa, Yield strength min. 310 Mpa,
Elongation min. 12%.
Most of iron foundries in
China could do the test of tensile strength, so you could require
the suppliers to provide the physical inspection report.
As for the hardness, there is no requirement in the
ASTM A536 standard, but
normally, the hardness should be 160 to 210 Brinell hardness (HB).
There is no requirement to the chemical components in the A536
standard, which means the iron foundries could control and adjust
the chemical components according to their own experience, as long
as they could meet the physical properties.
However, according to the experience of
Dandong Foundry in China, the approximate chemical
components of 65-45-12 should be as C: 3.30-3.80%, Si: 2.40-2.90%,
Mn: 0.2-0.5, P: 0.03-0.06, S: 0.02-0.040, Mg: 0.020-0.060. RE:
As for the ductile iron parts used for automotive industries, they
usually require the percent of spheroidization or called as
nodularity. A high nodularity means the ductile iron has better
physical properties, and more stable quality. Automotive parts
usually require 90% to 98% nodularity, only some professional and
large iron foundries could reach this level, and most of iron
foundries just could reach about 75% to 85%. Nodularity is not a
stipulated inspection unless the clients have specific purpose.
As we said before, the ductile Iron 60-40-18 is widely used because
of its good physical properties, but what areas should ductile Iron
65-45-12 be used? Since 65-45-12 has higher tensile strength and
corrosion-resistance, they have been widely used for furrow plough,
plow standard, differential case of agricultural machinery, drive
axle case, clutch housing of automotive vehicle, valve bodies, high
pressure cylinder of general machinery and top hat for electric
transmission line etc.