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Materials of Construction -
Metals - Alloy 33
February 4, 2003
|
Introduction Chemical Composition Corrosion Resistance Designations Specifications Physical Properties Mechanical Properties Fabrication Heat Treatment Forming Welding |
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Alloy 33 is a relatively new chromium-based corrosion resistant austenitic material introduced in 1995. It offers outstanding resistance to highly oxidizing media. Corrosion resistance is enhanced by additions of molybdenum and copper.
The high nitrogen content results in a small grain size in the solution-annealed condition which gives the material a high yield strength and excellent toughness properties.
Typical applications of Alloy 33 include heat exchangers, vessels, tubes and other equipment for sulphuric acid plants, sulphuric acid heat recovery and distribution systems, nitric-hydrofluoric acid pickling plants, seawater systems, evaporation plants for salts and alkalis, bleaching plants for chemical pulp, plate or tubular exchangers using brackish water or seawater as a coolant and lightweight strutures in the offshore industry.
| Nickel | Ni | 31 |
| Nitrogen | N | 0.4 |
| Chromium | Cr | 33 |
| Molybdenum | Mo | 1.6 |
| Iron | Fe | 32 |
| Copper | Cu | 0.6 |
| Carbon | C | 0.010 |
| Test | Temperature (°C) | Corrosion Rate (mm/year) |
| 98% H2SO4, 7 days | 100 | 0.04 |
| 125 | 0.07 | |
| 150 | 0.08 | |
| 175 | 0.16 | |
| 200 | 0.04 | |
| 99.1% H2SO4, 134 days, velocity > 1.2 m/s | 150 | < 0.01 |
| 96-98.5% H2SO4, 14 days, velocity > 1 m/s | 135 to 140 | < 0.01 |
| 96% H2SO4, 65 days, velocity > 1 m/s, saturated with SO2 | 80 | 0.06 |
| 96% H2SO4, 7 days, with nitrosylsulfuri acid | 240 | 0.33 |
UNS R20033
W.Nr. 1.4591
Krupp VDM: Nicofer 3033 - Alloy 33
VdTÜV Sheet 516
ASME Code Case 2227
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Alloy 33 is weldable by gas tungsten arc welding (GTAW) using matchng filler, plasma arc welding and laser welding. The mechanical properties of the matching weld deposit compare favourably with those of the base material.
