Chemical Engineering July 2022 - 35

TABLE 6. CPT TESTING TO ASTM G150
Steel grade
S32654
S31254
N08031
Alloy 625
N06022
N10276
CPT, °C
>90
85
> 90
> 90
> 90
> 90
the right choice of tools, tool settings
and cutting speeds, it can be
machined successfully.
Corrosion resistance. S32654 offers
very good resistance to uniform
corrosion, exceptionally good resistance
to pitting and crevice corrosion
with a PRE number of 56 and
very good resistance to stress corrosion
cracking (SCC). Laboratory
testing shows that S32654 has a
higher corrosion resistance in chloride
environments than Alloy 625,
and similar performance to C-276,
a nickel-molybdenum-chromium
alloy that exhibits excellent corrosion
resistance in a variety of harsh
environments and media.
The relative resistance to pitting
and crevice corrosion of materials
can be illustrated in different ways by
using the critical pitting temperature
(CPT) and crevice corrosion temperature
(CCT) as determined by the
technical standards: ASTM G48E
(CPT), ASTM G48F (CCT) and ASTM
G150 (CPT).
Table 5 illustrates the results of CPT
and CCT testing on dry ground surfaces
prepared with 120 grit. Table 6
shows the results of CPT testing to
ASTM G150 on wet ground surfaces
prepared with 320 grit.
Stainless steel vs. Ti
It is not only nickel alloys that might
be usefully substituted by S32654.
It can also offer an interesting costeffective
alternative to titanium in
some applications, especially heat
exchangers. In fact, it will outperform
titanium in any application
exposed to fluoride ions, as this is
harmful to titanium.
Proven in the field
The capabilities of S32654 have
been tested in a wide variety of applications.
A few of these are highCHEMICAL
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Chemical Engineering July 2022

Table of Contents for the Digital Edition of Chemical Engineering July 2022

Chemical Engineering July 2022 - 1
Chemical Engineering July 2022 - Cover1
Chemical Engineering July 2022 - Cover2
Chemical Engineering July 2022 - 1
Chemical Engineering July 2022 - 2
Chemical Engineering July 2022 - 3
Chemical Engineering July 2022 - 4
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Chemical Engineering July 2022 - Cover3
Chemical Engineering July 2022 - Cover4
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