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SEA-CURE Specification Information |
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DESCRIPTION |
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The ferritic structure of
SEA-CURE®
stainless steel provides a high
strength/low work hardening material with good ductility. These properties allow
high design stress limits with good fabrication characteristics. Because of the
nickel addition,
SEA-CURE®
has a lower ductile-to-brittle
transition temperature than similar ferritic steels without nickel additions.
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APPLICATIONS |
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This alloy
is specifically designed for applications where chloride induced pitting, crevice
and stress corrosion cracking may be encountered.
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Plymouth
SEA-CURE®
stainless steel
is used in electric power plant condensers and feedwater heaters, various heat exchangers
in chemical, petrochemical and refining applications, desalination heat exchangers
and flue gas handling systems such as the secondary heat exchangers in high efficiency
furnaces. The American Gas Association has approved
SEA-CURE® for flue gas condensate applications.
SEA-CURE®
stainless
steel has better resistance to general corrosion over a broader range of conditions
than the austenitic stainless steels.
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CORROSION RESISTANCE |
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Resistance to a number of strong
acids was evaluated using the Materials Technology Institute of the Chemical Process
Industries procedures.
Representative data are given below-
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Acid Solution |
Temperature
˚F
˚C |
Type 304 |
Type 304 |
SEACURE® |
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Corrosion Rate—MPY* |
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0.1% Hydrochloric |
212 |
100 B |
17.4 |
2.08 |
0.23 |
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1.0% Hydrochloric |
210 |
99 B |
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0.68 |
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1.0% Hydrochloric + 3% FeCl3 |
167 |
75 |
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2.27** |
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10% Sulfuric |
215 |
102 B |
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1.05 |
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60% Sulfuric |
244 |
118 B |
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>1000 |
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93% Sulfuric |
171 |
77 |
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78 |
10 |
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50% Phosphoric |
228 |
109 B |
2.46 |
3.87 |
1.78 |
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10% Nitric |
219 |
104 B |
0.37 |
0.96 |
0.46 |
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65% Nitric |
241 |
116 B |
3.34 |
3.95 |
1.20*** |
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60% Nitric + 2% HCL |
235 |
113 B |
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4.18*** |
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80% Acetic |
217 |
103 B |
17 |
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0.02 |
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100% Acetic |
243 |
117 B |
0.39 |
0.54 |
0.44 |
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50% Acetic + 50% Anhyd |
164 |
73 |
0.4 |
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1.6 |
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50% Formic |
221 |
105 B |
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0.89 |
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10% Oxalic |
216 |
102 B |
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1.31 |
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55% NaOH + 8% NaC +3% NaClO3 |
210 |
99 |
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6.1 |
<0.1 |
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50% NaOH |
289 |
143 |
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15 |
1 |
* Corrosion rate in
mills per year - evaluated over a 96 hour test
period
** Pitting
*** Welded SEA-CURE showed good performance in the
nitric tests.
However, caution should be exercised in using any
titanium stabilized alloy in highly oxidizing
environments
B - Boiling |
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EROSION-CORROSION RESISTANCE |
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SEA-CURE
stainless has excellent resistance to all types of erosion.
It is not effected by high water velocities caused by tube blockage or mechanical
design, nor by steam impingement. Compared to Type 316 it has only 25% of the weight
loss in an eroding environment. In sand
abrasion/erosion tests
SEA-CURE®
stainless performs extremely
well. This test, reported in Table 15, using silica sand and pH 8 synthetic seawater
at 110 degrees Fahrenheit (43 degrees Celsius), indicates that both
SEA-CURE®
stainless and titanium grade
2 have over 3.5 times the resistance of 90-10 copper-nickel and 1.3 times that of
AL-6XN.
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Please
feel free to
contact us if you have any further questions.
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SEA-CURE is a registered Trademark of Plymouth
Tube Company.
SEA-CURE tubing is manufactured and tested to the requirements and tolerances of ASTM A-268, A-803, ASME SA-268 and SA-803
and U.S. Patents 4,119, 765 and 4,942,922.
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