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 Temperature Thickness 0.2%Offset

Yield Strength

Ultimate Tensile Strength

Elongation

°F

°C in mm ksi MPa ksi MPa

%

Sheet

RT RT 0.078 2 51.6 356 114.9 792 61

Sheet

400 204 0.078 2 42 290 100.6 694

59

Sheet

600 316 0.078 2 35.9 248 98.8 681

68

Sheet

800 427 0.078 2 32.7 225 94.3 650

67

Sheet

400 204 0.094 2.4 39.9 275 101 696

58

Sheet

600 316 0.094 2.4 33.5 231 97.6 673

64

Sheet

800 427 0.094 2.4 29.7 205 93.5 645 64
Sheet1 400 204 0.063-0.187 1.6-4.7 42.1 290 100.8 695

56

Sheet2

600 316 0.063-0.187 1.6-4.7 37.7 260 97 669 64

Sheet2

800 427 0.063-0.187 1.6-4.7 34.8 240 95 655 65
Sheet2 1000 538 0.063-0.187 1.6-4.7 33.8 233 88.9 613

60

Plate3 400 204 0.188-1.0 4.8-25.4 38.2 263 98.9 682

61

Plate3

600 316 0.188-1.0 4.8-25.4 34.1 235 94.3 650 66
Plate3 800 427 0.188-1.0 4.8-25.4 32.7 225 91.5 631

60

Plate3

1000 538 0.188-1.0 4.8-25.4 32.8 226 87.2 601 59
Plate RT RT 1 25.4 52.9 365 113.9 785

59

Plate

600 316 1 25.4 36.2 250 96.3 664 63
Plate 800 427 1 25.4 30.5 210 94.8 654

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 Temperature Form Thickness Impact Strength
in mm ft.lbf

J

Charpy V-Notch

RT Plate 0.394 10 348 472
Charpy V-Notch RT Plate 0.472 12 351

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, HRBW Typical ASTM Grain Size

Sheet

88

3.5 – 6

Plate

88

1 – 5

Bar 86

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