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Sulphuric Acid on the WebTM Technical Manual DKL Engineering, Inc.

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Sulphuric Acid on the Web

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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
Associated Links

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)

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

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Corrosion Resistance

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Designations

None

Specifications

None

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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