Hastelloy

Hastelloy C-276 Alloy/H-2002C

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CORROSION-RESISTANT ALLOYS

HASTELLOY C-276 ALLOY
®

Excellent corrosionresistance to both oxidizing
and reducing media and
excellent resistance to
localized corrosion attack.

Contents
Principal Features

3

Chemical Composition

3

Physical Properties

4

Dynamic Modulus of Elasticity

4

Formability4

Impact Strength

5

Tensile Data

5

Hardness

5

Aqueous Corrosion Data

6

Localized Corrosion Data

8

Isocorrosion Diagrams

11

Availability

H-2002C

15

Sales Office Addresses

16

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HASTELLOY® : THE NAME TO TRUST

In aggressive/corrosive service,
when nothing else works, manyindustries have traditionally turned
to HASTELLOY® C-276 alloy.
Many years of outstanding
performance in a variety of
industrial applications have
confirmed the advantages of using
the alloy. Materials engineers in the

chemical processing and other
industries have grown
accustomed to specifying its high
performance based on laboratory
testing, field trials and/or prior
experience.
Some“generic” alloy N10276
products fail to measure up to the
performance industry expects

from HASTELLOY C-276 alloy
which is produced via exacting
processes, and backed by years
of experience in chemistry control,
thermal-mechanical processing,
testing and qualifications to rigid
standards.

UNS N10276 (SOURCE X)

HASTELLOY® C-276 ALLOY

MILL ANNEALED

MILL ANNEALED
ASTM G-28A 1
ASTMG-28B2
GREEN DEATH3

373 MPY
2752 MPY
1535 MPY
PITTING

ASTM G-28B

238 MPY
49 MPY
24 MPY
NO ATTACK

ASTM G-28B

GREEN-DEATH

GREEN DEATH

1 ASTM
2
3

G-28A = 50% H 2SO4 + 42g/l Fe2 (SO4)3 (Boiling)
ASTM G-28B = 23% H 2SO 4 + 1.2% HCl + 1% F e2Cl3 + 1% CuCl 2 (Boiling)
GREEN DEATH = 11.5% H 2SO 4 + 1.2% HCl + 1% Fe2Cl3 + 1% CuCl 2 (Boiling)

When the alloy is specifiedby the UNS Number, discerning questions should be asked for assurance of HASTELLOY C-276 alloy
performance:
• Does the product possess the clean, homogeneous microstructure so important for good resistance to aqueous
corrosion?
• How does the product perform in tough environments (e.g., rigorous pitting conditions) for which this material is
most often specified?
• Is the corrosionresistance of the welded product, in a discriminating test, up to par?

© 1997 by Haynes International, Inc.

HASTELLOY® C-276 alloy

2

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PRINCIPAL FEATURES
Excellent Resistance
to Corrosion
HASTELLOY® C-276 alloy is a
nickel-molybdenum-chromium
wrought alloy that is generally
considered a versatile corrosionresistant alloy.C-276 alloy is an
improved wrought version of alloy
C in that it usually doesn’t need to
be solution heat-treated after
welding and has vastly improved
fabricability. This alloy resists the
formation of grain-boundary
precipitates in the weld heataffected zone, thus making it
suitable for most chemical process
applications in the as-welded
condition. However, in
environments where attackof the
C-276 alloy weld joint is
experienced, C-22® weld filler
materials should be considered
(See page 14).
C-276 alloy has excellent
resistance to localized corrosion
and to both oxidizing and reducing
media. Because of its versatility, C276 alloy can be used where
“upset” conditions are likely to
occur or in multipurpose plants.
HASTELLOY C-276 alloy has
excellent resistance to awide
variety of chemical process
environments, including strong
oxidizers such as ferric and cupric

chlorides, hot contaminated media
(organic and inorganic), chlorine,
formic and acetic acids, acetic
anhydride, and seawater and brine
solutions. It is used in flue gas
desulfurization systems because of
its excellent resistance to sulfur
compounds and chloride ions
encountered in...