Testing of Silcosteel
®
-CR treated coupons in
neutral, acidic, and basic chloride solutions,
according to ASTMG 61,
2
shows Silcosteel
®
-CR
treatment reduces corrosion rates by an
impressive 50x, compared to untreated 316L
stainless steel.
ImprovedPerformance inMarineor
AcidicEnvironments
Silcosteel
®
-CR treatment is effective in acidic or
salt corrosive environments, inwhich the user
demands extended service life for an existing
processwithout using high-priced alloys.
4000-hour salt spray testing (salt spray acceler-
atedweathering test ASTMB117) shows
Silcosteel
®
-CR treated stainless steel coupons
exhibit no surface corrosion, while untreated
coupons shows surface corrosion and accelerat-
ed corrosion at the coupon hole (Figure 4).
Neither coupons developed pitting over the test
period.
2
Figure 5, a comparison of lifetime costs in a
typical process system, shows Silcosteel
®
-CR
treatment can reduce the overall lifetime cost of
the system by hundreds of thousands of dollars.
While the initial cost of an unprotected stainless
steel system is lower than that of a comparable
Silcosteel
®
-CR system, the overall lifetime cost,
considering replacement cost due to corrosion, is
nearly double that of a Silcosteel
®
-CR treated
system. Conversely, high performance alloy sys-
tems offer superlative corrosion performance,
but the initial material cost can be up to six times
that of a comparable stainless steel system.
Silcosteel
®
-CR treatment has extended the life
of process systems in oil and gas production, oil
refining, petrochemical processing, aerospace
equipment, food and beverage processing, and
laboratory testing.
Silcosteel
®
-CR treated tubing and treated
Swagelok
®
or Parker fittings are available from
stock. Custom treatment is available for other fit-
tings, or for your process-specific components.
Summary
Test data show that Silcosteel
®
-CR treatment is
effective in extending the corrosion resistance
of stainless steel process systemswhile reduc-
ing overall systemmaintenance cost. Because
Silcosteel
®
-CR treatment can be applied to a
majority of existing process components,
process equipment life is extendedwithout sig-
nificant re-engineering.
To learnmore about how Silcosteel
®
-CR treat-
ment can improve the corrosion performance of
your process system, visit Restek Performance
Coatings on theweb at
or contact our technical service group at
814-353-1300 or 800-356-1688, ext. 4.
References
1. G. Koch;M. Brongers; N.Thompson;Y. Virmani; J. Payer;
Report# FHWA-RD-01-156,
CorrosionCost and Preventive
Strategies in theUnited States
; Office of Infrastructure
Research andDevelopment, Federal Highway Administration,
McLean, VA. 2001
2. M. Zamanzadeh; G. Bayer; G. Rhodes; D. Smith; M. Higgins;
Laboratory Corrosion Testing of a Chemical Vapor
Deposited Amorphous Silicon Coating
; Matco Associates,
Inc. Pittsburgh, PA; Restek Corporation, Bellefonte, PA.
2005
Figure4
Silcosteel®-CR treated316L stainless
steel coupons showno signof attackafter
4000-hour salt sprayexposure, perASTMB117.
Silcosteel®-CR treated
untreated
Figure5
Silcosteel®-CRdemonstrates
significant cost savings, compared tountreat-
ed stainless steel or alloys (USdollars).
Silcosteel
®
-CR-TreatedElectropolishedTubing
• Exceptional inertness.
• Improved reliability and reproducibility; longer
lifetime.
• Usewith treated fittings for themost inert sample
pathway available.
Price-per-foot
ID
OD
cat.#
5-24 ft.
25-99 ft.
100-299 ft.
>300 ft.
0.085" *
1
/
8
"
22536
0.180" *
1
/
4
"
22537
CoiledSilcosteel
®
-CR -TreatedSeamless316LStainlessSteelTubing
Price-per-foot
ID
OD
cat.#
5-24 ft.
25-199 ft.
200-399 ft.
>400 ft.
0.055" (1.40mm)
1
/
8
" (3.18mm)**
22896
0.180" (4.57mm)
1
/
4
" (6.35mm)**
22897
We offer awide variety of
Silcosteel®-CR-treated fittings
and custom treatment. For information and
ordering, call us or visit us online.
110Benner Circle • Bellefonte, PA 16823
800-356-1688•814-353-1300• fax: 814-353-1309
Restek
Performance
Coatings
Lit. Cat.#59090
© 2005 Restek Corporation.
free
literature
Learnmore about our precisely applied, highly
durable surface treatments: request our
brochure lit. cat.# 59493.
Restek trademarks:
Silcosteel, the RPC logo.
Other trademarks:
Swagelok (Swagelok Co.)
$600,000
$400,000
$200,000
0
untreated
stainless
steel
Silcosteel
®
-CR
*
1
/
8
" OD: 5 ft. to 100 ft. in one continuous coil;
1
/
4
" OD: 5 ft. to 300 ft. in one continuous coil. Longer lengthswill bemore than one coil.
**0.035" wall thickness
high
performance
alloy
