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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Introduction

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.

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Chemical Composition (wt% typical)

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Corrosion Resistance

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Designations

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Specifications

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Physical Properties

None available

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Mechanical Properties

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)

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