| Designation | Nominal Composition | Maximum Temp (cont. Serv. Air) |
Melting Range |
Application Notes |
|
| 304SS | 18% Chromium | 900 C | 1371 C-1454 C | Offers excellent resistance to many corrosive agents encountered in domestic and industrial use. | |
| 310SS | 25% Chromium | 1148 C | 1371 C-1454 C | Good resistance to oxidation at temperatures up to 1148 C. Good resistance to thermal fatigue and cyclic heating. | |
| 316SS | 17% Chromium 12% Nickel 2-3% Molybdenum |
898 C | 1371 C-1454 C | Good resistance to a wider range of chemicals than 304SS. Withstands sulphurous acid compounds. | |
| 321SS | Similar to 304SS but Steel stabilized by Titanium addition | 871 C | 1371 C-1426 C | Not sensitive to inter-granular corrosion when heated within the carbide precipitation range of 482 C -815 C. Similar in corrosion resistance to 304SS. | |
| 347SS | Similar to 304SS but contains Tantalum and is Steel stabilized by Colombium addition | 871 C | 1371 C-1426 C | Excellent equivalent to 304SS for 426 C - 815 C range. Superior to 321SS where service is both corrosive and at an elevated temperature. | |
| 304LSS 316LSS |
Similar to 304SS and 316SS but with reduced carbon | 871 C | 1371 C-1454 C | Low carbon versions of 304SS and 316SS (maximum of 0.03% carbon). Because of low carbon content the effects of carbide precipitation are reduced. | |
| Carpenter 20-Cb-3 |
20% Chromium 34% Nickel 2.5% Molybdenum 3.5% Copper |
954 C | 1426 C | Superior grade with excellent resistance to corrosive conditions. | |
| Inconel 600 | 76% Nickel 15.5% Chromium |
1148 C | 1354 C-1412 C | Excellent material for severely corrosive environments. Resistant to oxidation at temperatures up to 1175 C. | |
| Inconel 601 | 60.5% Nickel 23.0% Chromium 1.5% Aluminum |
1148 C | 1301 C-1367 C | Similar to Inconel 600 however higher Chromium content gives superior resistance to oxidizing, carburizing and Sulphur containing environments. | |
| Incoloy 800 | 32.5% Nickel 46% Iron 21% Chromium |
1093 C | 1357 C-1385 C | Resistant to oxidation and carburization at elevated temperatures. It resists stress - corrosion cracking, Sulphur attack, internal oxidation, scaling and corrosion in a wide variety of industrial atmospheres. | |
| Monel 400 | 66% Nickel 31% Copper |
537 C | 1343 C | Highly resistant to corrosion by chlorinated solvents, glass etching agents, Sulphuric and many other acids, and practically all alkalies generally free from stress-corrosion cracking. Good resistant to salt water corrosion. | |
| Hastelloy B | 61% Nickel 28% Molybdenum |
1204 C | 1260 C-1354 C | Good corrosion resistance to Hydrochloric, Sulphuric, Phosphoric, and Acetic acids. Excellent corrosion resistance to Hydrogen-Chloride gas. | |
| Hastelloy C | 54% Nickel 16% Molybdenum 15.5% Chromium 4% Tungsten |
1204 C | 1260 C-1354 C | Good corrosion resistance to many chemical environments, including Ferric and Cupric Chlorides, contaminated mineral acids, wet Chlorine gas. Oxidation resistance to 990 C. | |
| Hastelloy X | 47% Nickel 9% Molybdenum 22% Chromium 0.5% Tungsten |
1204 C | 1260 C-1354 C | Good high temperature strength and resistance to oxidation to 1204 C. Also good for reducing conditions. | |
Thermowell Materials
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