Haynes Hastelloy® D-205 Corrosion Resistant Alloy

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Haynes Hastelloy® D-205 Corrosion Resistant Alloy (discontinued **)
Categories:	Metal; Nonferrous Metal; Nickel Alloy; Superalloy
Material Notes:	High silicon alloy based on the Ni-20Cr system. Its chief advantages over high silicon-iron based alloys are excellent formability, good resistance to elevated temperature embrittlement, and superior performance In many concentrations of sulfuric acid. D-205 alloy also possesses high resistance to stress corrosion cracking and is considerably more resistant to pitting corrosion than type 316L Stainless 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 by age-hardening. Information provided by Haynes.
Key Words:	D205
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Physical Properties	Metric	English	Comments

Environmental Stress Crack Resistance	>= 1008 hour @Temperature 154 °C	>= 1008 hour @Temperature 309 °F	45% MgCl2

Mechanical Properties	Metric	English	Comments
Tensile Strength, Ultimate	786 MPa	114000 psi	Mill Annealed
	979 MPa	142000 psi	Aged 24hrs/1000°F
Tensile Strength, Yield	338 MPa @Strain 0.2 %	49000 psi @Strain 0.2 %	Mill Annealed
	717 MPa @Strain 0.2 %	104000 psi @Strain 0.2 %	Aged 24hrs/1000°F
Elongation at Break	28.6 %	28.6 %	in 2in., Aged 24hrs/1000°F
	56.5 %	56.5 %	in 2in., Mill Annealed

Component Elements Properties	Metric	English	Comments
Carbon, C	<= 0.030 %	<= 0.030 %
Chromium, Cr	20 %	20 %
Copper, Cu	2.0 %	2.0 %
Iron, Fe	6.0 %	6.0 %
Molybdenum, Mo	2.5 %	2.5 %
Nickel, Ni	64.47 - 64.5 %	64.47 - 64.5 %
Silicon, Si	5.0 %	5.0 %

Descriptive Properties
Critical Pitting Temp	30°C		4% NaCl + 0.1% Fe2(SO4)3 + 0.01 M HCl

**
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NHAD205 / 16786

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