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RA333
Product Information
Performance Profile
For extreme heat RA333® alloy is the alloy of choice for the toughest duties. The outstanding properties of RA333 alloy made it the material of choice for the explosive forming dies to make the space shuttle engines.
RA333 alloy is a high chromium, nickel base super-alloy with outstanding resistance to high temperature oxidation up to 2200°F, carburization, and thermal shock. It is used for use when RA330, alloy 600 or 601 can’t handle the environment. RA333 alloy is unique as it is one of the few materials that can withstand corrosive conditions ranging from aqueous wet corrosion to white heat. The alloy has been used for dampers and refractory anchors in 13% SO2/SO3 at 1800°F to resist sulfidation, and for refinery flare tips. Upon shut-down, RA333 resists attack by sulfuric and polythionic acids formed below the dew point.
Specifications
UNS N06333
ASTM B718, ASTM B719, ASTM B723, ASTM B726, ASTM B722
ASME SB718, ASME SB719, ASME SB723, ASME SB726, ASME SB722
AMS 5593, AMS 5717
Inventory
RA333 Plate, RA333 Welding Products
Applications
- Tube supports in refineries and coal fired boilers
- Heat treating muffles, retorts, fan shafts and fixtures
- Carbon Fiber production muffles
- Sulfuric acid plant stack dampers
- Molten glass spinnerets
- Flare tips
- RA333 weld filler for repair welding of cast heat resistant alloys
- Tire Drop Chutes for Cement Kilns
Chemical Composition, %
| Ni | Cr | Mo | Co | W | Si | Mn | C | Fe | |
|---|---|---|---|---|---|---|---|---|---|
| MIN | 44.00 | 24.00 | 2.50 | 2.50 | 2.50 | 0.75 | -- | -- | |
| MAX | 47.00 | 27.00 | 4.00 | 4.00 | 4.00 | 1.50 | 2.00 | 0.08 | Balance |
Carburization/Metal Dusting
RA333 was originally developed to withstand high temperature carburizing service. It is one of the most carburization resistant materials available. Because of this ability RA333 has been the choice for all types of applications that require heavily carburizing atmospheres. Fabrications including radiant tubes, corrugated boxes and furnace belt pins have all been made from RA333 to withstand the high carbon potentials within these atmospheres. Resistance to metal dusting environments can be attributed to the alloying elements of silicon and tungsten. Simply having a high temperature alloy with chromium and nickel without these elements would be insufficient for a metal dusting application. Along with alloy chemistry, metal dusting resistance is influenced by grain size. A finer grain size greatly increases the rate at which chromium can diffuse to the surface to form a protective film.
310 stainless flight corroded in between two RA333 weld beads in a metal dusting atmosphere.
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