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UNS N10276 (Hastelloy C-276) alloy (marketing department of Shanghai HY Industry Co., Ltd)
UNS N10276 (Hastelloy C-276) alloy is a Ni-Cr-Mo alloy with excellent corrosion resistance in both oxidizing and reducing environments. This alloy improves corrosion resistance by reducing the content of C and Si, controlling the precipitation of carbides in the heat-affected zone of the heating part. Based on this feature, it is widely used in harsh environments such as complete sets of chemical equipment.
Grade
NAS spec
ASTM B575
DIN 17744/17750
JIS H4551
NW276
UNS N10276
2.4819
NW 0276
Component
C
Si
Mn
P
S
Fe
≤0.010
≤0.08
≤1.0
≤0.04
≤0.03
4.0~
7.0
Cr
Mo
Co
W
V
Ni
14.5~
16.5
15.0~
17.0
≤2.5
3.0~
4.5
≤0.35
Rest
physical properties
density（g/cm³）
8.9
specific heat capacity (J/kg･K)
436
Resistivity (μΩ･cm)
130
Thermal conductivity (W/m･K)
10.8
thermal diffusivity (m²/s)
2.8×10-6
Average coefficient of thermal expansion (10-6/℃)
20~100℃
12.2
20~200℃
12.5
20~300℃
12.9
20~400℃
13.2
20~500℃
13.6
Longitudinal modulus of elasticity (MPa)
21.1×104
modulus of rigidity (MPa)
80.8×104
modulus of rigidity
N
melting point (℃)
1325~1369
Mechanical properties
difference
YS(N/mm2)
TS(N/mm2)
EL(%)
HRB
UNS standard
≥283
≥690
≥40
≤(100)
HR 14mmt
372
763
71
83
CR 12mmt
319
738
76
83
CR 2mmt
366
785
61
86
Corrosion resistance Pitting resistance
Alloy
critical point corrosion temperature (CPT)
6%FeCl3+1%HCl aqueous solution
(ASTM G48 Method C)
Green death solution
UNS N10276
> 120℃
> 120℃
NAS 254N
80℃
80℃
NAS 329J3L
50℃
45℃
SUS 316L
10℃
25℃
Crevice corrosion resistance
Alloy
critical point corrosion temperature (CPT)
6%FeCl3+1%HCl aqueous solution
(ASTM G48 Method D)
Green death solution
UNS N10276
100℃
110℃
NAS 254N
40℃
45℃
NAS 329J3L
25℃
30℃
SUS 316L
＜0℃
＜0℃
experiment method:
①ASTM G48 method C:
Test time 72 hours
②ASTM G48 method D:
Test time 72 hours
Create gaps with multi-tooth clips
③Green death solution soaking:
Test time 24 hours
Test solution 7%H2SO4+3%HCl+1%FeCl3+1%CuCl2
Crevice corrosion test using multi-tooth grippers to create crevices
Intergranular corrosion resistance
Test conditions: ASTM G28 method A
The test time is 24 hours, boiling 50% H2SO4 – Fe2 (SO4)3 aqueous solution
Acid corrosion resistance
test solution
Temp
concentration
corrosion rate (g/m²･hr)
(℃)
(%)
NAS
NW276
NAS
254N*
NAS
329J3L*
SUS
316L
H2SO4
80
5
0.02
0.02
0
1.1
10
0.03
0.02
0.14
2.92
20
0.04
1.16
3.33
20.1
40
0.06
1.78
250.5
291.3
60
0.08
1.86
263.1
72
80
0.03
2.82
90.4
11.1
boiling
5
0.1
1.43
0.61
5.45
10
0.16
2.49
3.3
18
20
0.33
6.18
76.2
108.7
40
1.44
21
271.7
297.8
HCl
80
0.1
0
0
0
0.01
1
0.02
0
0.01
2.45
2
0.03
3.15
19
6.66
3
0.33
12.8
51.5
13.6
boiling
0.1
0
0
0
0.01
1
0.23
0.13
4.82
6.32
2
0.91
27.8
56.7
33.6
3
1.64
54.2
145.2
69.1
Test conditions: test time 24 hours
The unit of corrosion rate is converted from g/m²・h to mm/y
mm/y = g/m²・h × 8.76/d (d is density)
[d] NAS NW276: 8.90g/cm³, NAS 254N: 8.06g/cm³,
NAS 329J3L: 7.80g/cm³, SUS 316L: 7.98g/cm³
* NAS 254N: 23Cr-25Ni-5.5Mo-0.2N (super austenitic stainless steel)
* NAS 329J3L: 22.5Cr-5.3Ni-3.2Mo-0.16N (duplex stainless steel)
Stress corrosion cracking resistance
Alloy
MgCl2 Concentration (the lower part is the boiling point ℃)
20%
(108)
25%
(110)
30%
(115)
35%
(126)
38%
(134)
42%
(142)
UNS N10276
○
○
○
○
○
○
NAS 254N
○
○
○
○
○
○
NAS 329J3L
○
○
×
×
×
×
SUS 316L
○
×
×
×
×
×
Test conditions: Soak in boiling MgCl2 aqueous solution, test time 300 hours, use U-shaped bending sample
○: No cracking ×: Stress corrosion cracking
Microstructure
NW276 is an austenite structure with a face-centered cubic lattice structure
Welding performance
The same conventional welding methods as for stainless steel are applicable. Use solder of the same metal as the solder. Heat treatment is not necessary after welding.
heat treatment
The solution treatment temperature is 1150~1170℃, and it must be quenched after heat treatment.
Purpose
UNS N10276 has been widely used in chemical and petrochemical fields, such as in components and catalytic systems contacting chloride-containing organic substances. This material is especially suitable for use in high temperature, inorganic and organic acids mixed with impurities (such as formic acid and acetic acid), seawater corrosion environment.
Pulp and paper industry, such as digestion and bleaching vessels
Scrubber, reheater, wet steam fan, etc. in the FGD system
Equipment and components operating in acid gas environment
Reactor for acetic acid and acidic products
Sulfuric acid condenser
Methylene diphenyl isocyanate (MDI)
Production and processing of impure phosphoric acid
Others: heat exchangers, centrifugal separators, dryers, reaction tanks, complete sets of salt-making equipment, flue gas desulfurization devices, etc.
Shanghai HY Industry Co., Ltdhas international first-class material production equipment such as high temperature alloy isothermal forging production line, CONSARC vacuum melting furnace, VAR vacuum arc remelting furnace etc., with strong professional ability and highly responsible management team. We are a member of China Application of nuclear energy materials, Member of the International Council of the Aeronautical Sciences. Years of experience in Corrosion Resistant Alloy & Superalloy. When you have superalloy material inquiry, please contact us without hesitation. Shanghai HY Industry Co., Ltd is Corrosion & fatigue nickel alloy professional manufacturer,We will provide you with sincere and thoughtful service.
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