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| Sulphuric Acid on the WebTM | Technical Manual | DKL Engineering, Inc. |
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Materials of Construction -
Metals - Cronifer 2803 Mo
March 5, 2003
|
Introduction Chemical Composition Corrosion Resistance Designations Specifications Physical Properties Mechanical Properties Fabrication Heat Treatment Forming Welding |
Associated Links |
Cronifer 2803 Mo also known as “Superferritic” is a
iron-chromium-nickel alloy with controlled carbon and nitrogen contents,
stabilized with niobium. The material has excellent resistance to pitting
and crevice corrosion in chloride containing media.
Its high chromium content gives outstanding resistance to corrosion in oxidizing media such as hot, concentrated sulphuric acid where it is used in heat recovery systems in sulphuric acid plants.
Cronifer 2803 Mo is also produced as longitudinally welded thin wall tubing for heat exchanger using chloride containing cooling water.
Typical applications include seawater or brackish water cooling systems in power stations, seawater desalination plants, storage and transportation of organic and inorganic acids and sulphuric acid production.
A patent application has been submitted for the use of this material in sulphuric acid plants.
| Element | Cronifer 2803 Mo |
SEA-CURE®/ASTM A240 S44660 |
|
| Nickel | Ni | 3 - 4 |
1.0 - 3.5 |
| Nitrogen | N | 0.020 max |
0.040 max |
| Chromium | Cr |
28 – 29 |
25.0 - 28.0 |
| Molybdenum | Mo |
1.8 – 2.5 |
3.0 - 4.0 |
| Iron | Fe | Balance | Balance |
| Manganese | Mn | - |
1.0 max |
| Carbon | C |
0.015 max |
0.030 max |
| Silicon | Si | - | 1.00 max |
| Phosphorous | P | - | 0.040 max |
| Sulphur | S | - |
0.030 max |
| C + N | - |
0.030 max |
- |
| Nb/C + N | - | 12 min | - |
| Ti + Nb and
6x(C+N) min |
- | - |
0.20-1.00 |
SEA-CURE® is a registered Trademark of Crucible Materials Corporation
Cronifer 2803 Mo and SEA-CURE® share the same UNS number. The composition of the materials are similar but SEA-CURE allows the presence of Mn, Si, P and S and Cronifer 2803 Mo has more stringent specification for C, N and Nb. SEA-CURE® should not be considered as a direct substitute for Cronifer 2803 Mo in hot, concentrated sulphuric acid service without prior testing.
Avesta make a version of 1.4575 called Monit which has a slightly different composition.
No information available
UNS S44660
Werkstoff No. 1.4575
X 1 CrNiMoNb 28 4 2
ASTM A268 Grade 26-3-3
| Sheet/Strip |
ASTM A176(1) ASTM A240 |
| Tubing | ASTM A268 |
(1) Krupp VDM literature refers to ASTM A176 as an applicable specification but only UNS S44600 is listed in the specification.
| Density | 7.7 g/cm3 |
| Specific Heat | 400 J/kg K |
| Thermal Conductivity | 14.5 W/m K |
| Electrical Resistivity | 80 µO cm |
| Thermal Expansion (20-300°C) | 10.5 (10-6) /K |
| Modulus of Elasticity | 215 kN/mm2 |
No information
No information
Good
Weldabity is considered satifactory
Filler wire Cronifer S 2803
