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DKL Engineering, Inc.
Handbook of Sulphuric Acid Manufacturing
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Materials of Construction -
Metals - Alloy D-205
March 12, 2003
Introduction Chemical Composition Corrosion Resistance Designations Specifications Physical Properties Mechanical Properties |
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Hastelloy® D-205™ Alloy is an advanced high-silicon alloy based on the Ni-20Cr system. Its chief advantage over high silicon-iron based alloys are excellent formability, good resistance to elevated temperature embrittlement and superior performance in many concentrations of sulphuric acid. D-205 alloy also possesses high resistance to stress corrosion cracking and is considerably more resistance to pitting corrosion than Type 316L stainless steel and Fe-17Cr-20Ni-5Si alloys.
Given these attributes, D-205 alloy constitutes an ideal sulfuric acid, plate-heat-exchanger material. Also, the alloy is very useful for all hardware involved with the processing of highly oxidizing media. An added benefit is that the yield strength of D-205 can be more than doubled (from 49 ksi to 104 ksi) by age-hardening.
The alloy is weldable and post weld heat treatment is recommended to insure ductility, if required for service conditions.
Chemical Composition (wt% typical)
Nickel | Ni | Balance |
Chromium | Cr | 19.5 - 20.5 |
Molybdenum | Mo | 2.0 - 3.0 |
Iron | Fe | 5.5 - 6.5 |
Carbon | C | 0.03 max |
Silicon | Si | 4.5 - 5.5 |
Copper | Cu | 1.7 - 2.3 |
None
None
None available
Ultimate Tensile Strength | 114 ksi (mill annealed) 142 ksi (aged 24 h/538ºC (1000ºF)/SAC) |
Elongation in 2 in. | 56.5% (mill annealed) 28.6 (aged 24 h/538ºC (1000ºF)/SAC) |
Yield Strength (0.2% offset) | 49 ksi (mill annealed) 104 ksi (aged 24 h/538ºC (1000ºF)/SAC) |