Hastelloy c-276

 HASTELLOY C-276 TECHNICAL DATA

Type Analysis

Element Min Max
Molybdenum 15.0 17.0
Chromium 14.5 16.5
Iron 4.00 7.00
Tungsten 3.00 4.50
Cobalt 2.50
Carbon 0.02
Silicon 0.08
Manganese 1.00
Vanadium 0.35
Phosphorus 0.03
Sulfur 0.03
Nickel Remainder

Description

Hastelloy C-276 is a nickel-molybdenum-chromium-tungsten alloy with excellent general corrosion resistance and good fabricability. The alloy should be considered for use in environments where resistance to hot contaminated mineral acids, organic and inorganic chloride-contaminated media, chlorine, formic and acetic acids, acetic , acetic anhydride, sea water and brine solutions is desired.
Hastelloy C-276 has resisted the formation of grain boundary precipitates in the weld heat-affected zone, making it a candidate for most chemical and petrochemical processing applications in the as-welded condition. The alloy has resisted both general and localized corrosion, including pitting, crevice corrosion, and stress corrosion cracking.
Hastelloy C-276 is readily fabricated by welding, using methods similar to those utilized for nickel-based alloys.

Corrosion Resistance

Hastelloy C-276 is balanced to provide excellent corrosion resistance to a variety of chemical process environments. This alloy has provided resistance to hot contaminated mineral acids, organic and inorganic chloride contaminated media, hypochlorite, chlorine dioxide solutions, formic and acetc acids, acetic anhydride, sea water and brine solutions.

Typical General Corrosion Rates*

Environment Concentration
(% by weight)
Test
Temperature
Penetration Rate (per year)
°F °C Unwelded** As-welded*** Welded and
heat-treated**
mils mm mils mm mils mm
Formic Acid
Hydrochloric Acid
Hydrochloric Acid
Hydrochloric Acid
Hydrochloric Acid
Sulfuric Acid
Sulfuric Acid
20
10
10
10+0.5 NaOCl
3.5+8 Fe Cl3
10
85
Boiling
150
167
167
190
Boiling
167
Boiling
66
75
75
88
Boiling
75
4.8
21.
40.
46.

15.
17.
0.12
0.53
1.02
1.17

0.38
0.43
3.5
20.
50.
50.
5.
14.
17.
0.09
0.51
1.27
1.27
0.13
0.36
0.43
3.60
21.



18.
0.09
0.53



0.46

*Determined in laboratory tests. It is recommended that samples be tested under actual plant conditions.
**Solution heat-treated
***Gas tungsten-arc welded.

Workability

Hastelloy C-276 can be forged, hot-upset, and impact extruded. Although the alloy tends to work-harden, it can be successfully deep-drawn, spun, press formed or punched. All of the common methods of welding can be used to weld alloy C-276, although the oxy-acetylene and submerged arc processes are not recommended when the fabricated item is intended for use in corrosion service. Special precautions should be taken to avoid excessive heat in-put.

Welding
Gas tungsten-arc welding, gas metal-arc welding, shielded metal-arc (coated electrode) welding, or resistance welding may be used. Minimum heat input consistent with adequate penetration reduces the chance of hot-cracking. Oxyacetylene welding should be avoided due to possibility of carburization. Hastelloy C-276 can be used in the as-welded condition in most chemical and petrochemical process equipment.

Heat-Treatment

Wrought forms of Hastelloy C-276 are furnished in the solution heat-treated condition unless otherwise specified. Alloy C-276 is normally solution heat-treated at 2050 °F and rapid quenched. Parts which have been hot-formed should be solution heat-treated prior to final fabrication or installation, if possible.

Average Physical Properties

Physical Properties °F British Units °C Metric Units
Density 72 0.321 lb./in.(3) 22 8.89 g/cm(3)
Melting Range 2415-
2500
1323-
1371
Electrical
Resistivity
75 51 microhm-in. 24 1.30 microhm-m
Mean Coefficient
of Thermal
Expansion
75-200 6.2 microin./in.-°F 24-93 11.2 X 10(-6)m/m-K
75-400 6.7 microin./in.-°F 24-204 12.0 X 10(-6)m/m-K
75-600 7.1 microin./in.-°F 24-316 12.8 X 10(-6)m/m-K
75-800 7.3 microin./in.-°F 24-427 13.2 X 10(-6)m/m-K
75-1000 7.4 microin./in.-°F 24-538 13.4 X 10(-6)m/m-K
75-1200 7.8 microin./in.-°F 24-649 14.1 X 10(-6)m/m-K
75-1400 8.3 microin./in.-°F 24-760 14.9 X 10(-6)m/m-K
75-1600 8.8 microin./in.-°F 24-871 15.9 X 10(-6)m/m-K
75-1700 8.9 microin./in.-°F 24-927 16.0 X 10(-6)m/m-K
Thermal
Conductivity
-270 50 Btu-in/ft²-hr-°F -168 7.2 W/m-K
-100 60 Btu-in/ft²-hr-°F -73 8.6 W/m-K
0 65 Btu-in/ft²-hr-°F 32 9.4 W/m-K
100 71 Btu-in/ft²-hr-°F 38 10.2 W/m-K
200 77 Btu-in/ft²-hr-°F 93 11.1 W/m-K
400 90 Btu-in/ft²-hr-°F 204 13.0 W/m-K
600 104 Btu-in/ft²-hr-°F 316 15.0 W/m-K
800 117 Btu-in/ft²-hr-°F 427 16.9 W/m-K
1000 132 Btu-in/ft²-hr-°F 538 19.0 W/m-K
1200 145 Btu-in/ft²-hr-°F 649 20.9 W/m-K
1400 159 Btu-in/ft²-hr-°F 760 22.9 W/m-K
1600 173 Btu-in/ft²-hr-°F 871 24.9 W/m-K
1800 185 Btu-in/ft²-hr-°F 982 26.7 W/m-K
2000 195 Btu-in/ft²-hr-°F 1093 28.1 W/m-K

Average Dynamic Modulus of Elasticity

Form Condition Test Temp,
°F(°C)
Average Dynamic Modulus of
Elasticity,10(6) psi (GPa)
Plate Heat-treated
at 2050 °F
(1121 °C),
Rapid Quenched
Room 29.8 (205)
400 (204) 28.3 (195)
600 (316) 27.3 (188)
800 (427) 26.4 (182)
1000 (538) 25.5 (176)

Average Room Temperature Hardness

Form Hardness,
Rockwell
Sheet Rb 90
Plate Rb 87

Average Tensile Data

Form Condition Test
Temp.,
°F(°C)
Ultimate
Tensile
Strength
ksi (MPa)
Yield
Strength at
0.2% offset
ksi (MPa)
Elongation
in 2″ percent
Sheet, 0.063 to
0.187″ Thick
Heat treated at
2050 °F
Rapid Quenched
400 (204)
600 (316)
800 (427)
1000 (538)
100.8 (695)
97.0 (669)
95.0 (655)
88.9 (613)
42.1 (290)
37.7 (260)
34.8 (240)
33.8 (233)
56
64
65
60
Plate, 3/16 to
1.000″ Thick
Heat treated at
2050 °F
Rapid Quenched
400 (204)
600 (316)
800 (427)
1000 (538)
98.9 (682)
94.3 (650)
91.5 (631)
87.2 (601)
38.2 (263)
34.1 (235)
32.7 (235)
32.8 (226)
61
66
60
59
Plate, 1.000″
Thick
Heat treated at
2050 °F
Rapid Quenched
Room
600 (316)
800 (427)
113.9 (785)
96.3 (664)
94.8 (654)
52.9 (365)
36.2 (250)
30.5 (210)
59
63
61

Average Oxidation Data

Test Temperature,
°F(°C)
Average Oxidation Rate per 100-hour test period
100 hours,continuous
mils mm
100 hours,intermittent
mils mm
1800 (982) 0.11 0.003 0.11 0.003
1900 (1038) 0.22 0.006 0.18 0.005
2000 (1093) 1.62 0.041 2.88 0.073