UNS N10276 pipes

UNS N10276 (Hastelloy C-276) alloy (marketing department of Shanghai HY Industry Co., Ltd)

Alloy Introduction

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.

  1. Pulp and paper industry, such as digestion and bleaching vessels

  2. Scrubber, reheater, wet steam fan, etc. in the FGD system

  3. Equipment and components operating in acid gas environment

  4. Reactor for acetic acid and acidic products

  5. Sulfuric acid condenser

  6. Methylene diphenyl isocyanate (MDI)

  7. Production and processing of impure phosphoric acid

  8. Others: heat exchangers, centrifugal separators, dryers, reaction tanks, complete sets of salt-making equipment, flue gas desulfurization devices, etc.

Shanghai HY Industry Co., Ltd has 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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