HASTELLOY C-276/UNS N10276/Alloy C-276

Hastelloy C-276 Seamless Pipe, UNS N10276 Plate, Alloy C-276 Round Bar

Hastelloy C-276 (UNS N10276) alloy is a nickel-molybdenum-chromium wrought alloy that is a versatile corrosion-resistant 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 heat-affected zone, thus making it suitable for most chemical process applications in the as-welded condition. However, in environments where an attack of the C-276 alloy weld joint is experienced. C-22 weld filler materials should be considered. C-276 alloy has excellent resistance to localized corrosion and to both oxidizing and reducing media. Because of its versatility, C-276 alloy can be used where “upset” conditions are likely to occur or in multipurpose plants. Hastelloy C-276 alloy has excellent resistance to a wide 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 most scrubbers. C-276 alloy has excellent resistance to pitting and to stress- corrosion cracking. It is also one of the few materials that withstand the corrosive effects of wet chlorine gas, hypochlorite, and chlorine dioxide.

Hastelloy C-276 alloy can be forged, hot-upset and impact extruded. Although the alloy tends to work hard, it can be successfully deep-drawn, spun, press formed or punched. All of the common methods of welding can be used to weld Hastelloy C-276 alloy, although the oxyacetylene process is not recommended. Special precautions should be taken to avoid excessive heat input.

Hastelloy C-276 is available in the form of plate, sheet, strip, billet, bar, wire, covered electrodes, pipe, tubing, pipe fittings, flanges, and fittings.

Heat Treatment: C-276 alloy is normally solution heat-treated at 2050°F (1121°C) and rapid quenched. If possible, parts which have been hot-formed should be solution heat-treated prior to final fabrication or installation.

Chemical Composition

Nickel:

57 Balance
Cobalt:

2.5 max.

Chromium:

16
Molybdenum:

16

Iron:

5
Tungsten:

4

Manganese:

1 max.

Vanadium:

0.35 max.

Silicon:

0.08 max.
Carbon:

0.01 max.

Copper:

0.5 max.

Mechanical Properties:

Form

Test TemperatureThickness0.2%Offset

Yield Strength

Ultimate Tensile Strength

Elongation

°F

°CinmmksiMPaksiMPa

%

Sheet

RTRT0.078251.6356114.979261

Sheet

4002040.078242290100.6694

59

Sheet

6003160.078235.924898.8681

68

Sheet

8004270.078232.722594.3650

67

Sheet

4002040.0942.439.9275101696

58

Sheet

6003160.0942.433.523197.6673

64

Sheet

8004270.0942.429.720593.564564
Sheet14002040.063-0.1871.6-4.742.1290100.8695

56

Sheet2

6003160.063-0.1871.6-4.737.72609766964

Sheet2

8004270.063-0.1871.6-4.734.82409565565
Sheet210005380.063-0.1871.6-4.733.823388.9613

60

Plate34002040.188-1.04.8-25.438.226398.9682

61

Plate3

6003160.188-1.04.8-25.434.123594.365066
Plate38004270.188-1.04.8-25.432.722591.5631

60

Plate3

10005380.188-1.04.8-25.432.822687.260159
PlateRTRT125.452.9365113.9785

59

Plate

600316125.436.225096.366463
Plate800427125.430.521094.8654

61

1: Average of 25 tests

2: Average of 34-36 tests

3: Average of 9-11 tests RT= Room Temperature

Impact Strength:

Type of Test

Test TemperatureFormThicknessImpact Strength
inmmft.lbf

J

Charpy V-Notch

RTPlate0.39410348472
Charpy V-NotchRTPlate0.47212351

476

*RT= Room Temperature

Available Products Forms:

HASTELLOY C-276 alloy (N10276, W10276)

Sheet, Plate & Strip

SB 575/B 575, PREN= 43

Billet, Rod & Bar

SB 574/B 574, B 472, PREN= 43

Coated Electrodes

SFA 5.11/ A 5.11 (ENiCrMo-4), DIN 2.4887, (EL-NiMo15Cr15W) F= 43

Bare Welding Rods & Wire

SFA 5.14/ A 5.14 (ERNiCrMo-4), DIN 2.4886, (SG-NiMo16Cr16W), PREN= 43

Seamless Pipe & Tube

SB 622/B 622, B 983, PREN= 43

Welded Pipe & Tube

SB 619/B 619, SB 626/B 626, PREN= 43

Fittings

SB 366/B 366, SB 462/B 462, PREN= 43
 Forgings

SB 564/B 564, SB 462/B 462, PREN= 43

DIN

17744 No. 2.4819 NiMo16Cr15W
 TÜV

Werkstoffblatt 400, Kennblatt 320, Kennblatt 319

Others

NACE MR0175 ISO 15156

Hardness:

Form

Hardness, HRBWTypical ASTM Grain Size

Sheet

88

3.5 – 6

Plate

88

1 – 5

Bar86

1 – 5

All samples were tested in solution-annealed condition. HRBW = Hardness Rockwell “B”, Tungsten Indentor.

Applications:

• Air Pollution Control—flue gas desulfurization systems – stack liners, absorbers, ducts, dampers, stack gas re-heaters and fans
• Chemical Processing—heat exchangers, pressure vessels, tanks, evaporators, piping, flanges and fittings, pumps and valves
• Oil and Gas Production—sour gas service components
• Pharmaceutical Production—reactor vessels, piping, flanges and fittings, pumps and valves
• Pulp and Paper—bleaching vessels and digestors
• Waste Treatment—incinerators for toxic, industrial and municipal waste

Keywords to find us: UNS N10276, ASME SB-574, ASME SB-575, ASME SB-619, ASME SB-622, and ASME SB-626