Hastelloy C276 Spiral Wound Gaskets
Item No.:ZD-G1202/C276
Description:Hastelloy
C276, Alloy 276 (UNS N10276), A
Nickel-Base Alloy with
Resistance in a Wide Range of
Aggressive Media.
Alloy 276 is a
nickel-molybdenum-chromium-iron-tungsten
alloy which is among the most
corrosion resistant alloys
currently available. Alloy 276
also has good high temperature
strength and moderate oxidation
resistance although the alloy
will eventually form embrittling
high temperature precipitates.
Alloy 276 has been available for
several years and has been used
in ASME Boiler and Pressure
Vessel related construction.
Spiral Wound
Gasket C276 Style applications:
Chemical and petrochemical
processing;
Flue gas desulfurizationg;
Pulp and paper equipments;
Industrial and municipal waste
equipments.
General
Corrosion:
The alloy 276 is used in a range
of environments from moderately
oxidizing to strongly reducing;
One application is in the more
corrosive area of flue gas
desulfurization system, such as
outlet ducting;
Alloy
276 compared to that of SS316 in
the "GREEN DEATH" simulated
scrubber solution
|
Green Death Solution (Boiling) |
Corrosion Rate, MPY (mm/a) |
|
|
|
316 |
276 |
|
3% Hydrochloric Acid |
Destroyed |
26.5 (0.67) |
Alloy 276 is considered inert to
seawater and is used in many
seawater, brine, and high
chloride environments, even at
strong acid pH values;
The
high level of nickel and
molybdenum provides extreme
resistance to chloride stress
corrosion cracking.
Chemical Analysis:
|
C |
Mn |
P |
S |
Si |
Cr |
Ni |
Mo |
W |
V |
Co |
Fe |
|
0.006 |
0.150 |
0.005 |
0.002 |
0.03 |
15.50 |
Balance |
16.0 |
3.50 |
0.15 |
0.10 |
6.00 |
Mechanical
Properties:
Minimum properties (ASTM B 575)
|
0.2% Yield Strength Minimum psi (MPa) |
Ultimate Tensile Strength Minimum psi (MPa) |
Elongation (% in 2'') Minimum |
Hardness Rb Minimum |
|
41,000 (283) |
100,000 (690) |
40 |
100 |
Density: 0.321lb/in3, 8.90g/cm3
Specific Gravity: 8.90
Specific Heat: 0.102 Btu/lb/oF,
425 Joules/kg/oK
Magnatic Permeability: 1.02
Electric Resistivity: 130
microhm-cm at 23 oC
Elastic Modulus 21oC: 29.8x106
psi (205 GPa)
Descaling and
Cleaning:
Clean surface is required to
obtain the optimum corrosion
resistance of C276. The alloy
276 content of the materials
makes descaling difficult.
Stainless wire brushing or grit
blasting is advisable, followed
by immersion in a mixture of
nitric and hydrofluoric acids
and a thorough water rinse.
