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Materials of Construction -
Metals - Hastelloy C-2000
April 22, 2004
Introduction Chemical Composition Corrosion Resistance Designation Specifications Physical Properties Mechanical Properties Fabrication Heat Treatment Forming Welding |
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Hastelloy C-2000 alloy (UNS N06200) is a nickel-molybdenum-chromium wrought alloy to which copper has been added. This alloy was first introduced in 1995 and has since gained increasing popularity owing to its inherent versatility. C-2000 alloy was designed to resist an extensive range of corrosive chemicals including sulphuric, hydrochloric and hydrofluoric acids. However, unlike other Ni-Cr-Mo alloys which were corrosion resistant to either oxidizing or reducing acids, but not both, C-2000 alloy was designed to be used in both environments. The combination of molybdenum and copper provide resistance to reducing media while the high chromium content provided resistance to oxidizing media.
In sulphuric acid plant applications, C-2000 alloy has been used interchangeably with Alloy C-276 for plate and frame heat exchanger plate by some vendors.
C-2000 | Alloy C-276 | ||
Nickel | Ni | Balance | Balance |
Cobalt | Co | 2.5 max | |
Chromium | Cr | 23 | 14.5 - 16.5 |
Molybdenum | Mo | 16 | 15.0 - 17.0 |
Tungsten | W | 3.0 - 4.5 | |
Carbon | C | 0.01 max | 0.01 max |
Iron | Fe | 4.0 - 7.0 | |
Silicon | Si | 0.08 max | 0.08 max |
Manganese | Mn | 1.0 max | |
Vanadium | V | 0.35 max | |
Phosphorous | P | 0.025 max | |
Sulphur | S | 0.010 max | |
Copper | Cu | 1.6 | - |
To follow
UNS N06200
ASTM Specifications B564, B574, B575, B619, B626, B366
ASME Code Case 2240
DIN Specifications 17744 No. 2.4675 and NiCr23Mo16Cu
Density | 8500 kg/m³ (530.5 lb/ft³) @ Room Temp. |
Melting Point | |
Specific Heat | |
Electrical Resistivity | 1.28 microhm m (50.6 microhm in) @ Room Temp. |
Thermal Conductivity | 9.1 W/m K (63 BTU in/ft² h ºF) @ Room Temp. |
10.8 W/m K (74 BTU in/ft² h ºF) @ 93ºC (200ºF) | |
14.1 W/m K (99 BTU in/ft² h ºF) @ 315ºC (600ºF) | |
18.0 W/m K (133 BTU in/ft² h ºF) @ 538ºC (1000ºF) |
Thickness |
Temperature | Ultimate Tensile Strength | Yield Strength @ 0.2% offset | Elongation in 50.8 mm (2 inches) |
0.063 in. | Room Temp | 752 MPa (109.0 ksi) | 358 MPa (52.0 ksi) | 64% |
0.125 in. | Room Temp | 765 MPa (111.0 ksi) | 393 MPa (57.0 ksi) | 63% |
0.250 in. | Room Temp | 779 MPa (113.0 ksi) | 379 MPa (55.0 ksi) | 62% |
0.500 in. | Room Temp | 758 MPa (110.0 ksi) | 345 MPa (50.0 ksi) | 68% |
1.00 in. | Room Temp | 752 MPa (109.0 ksi) | 372 MPa (54.0 ksi) | 63% |
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C-2000 Alloy is weldable by shielded-metal arc, gas-tungsten arc and gas-metal arc. Oxy-acetylene and submerged-arc welding are not recommended.
The Ni-Cr-Mo alloys exhibit low penetration characteristics, therefore adequate joint access (weld angle) and minimal land are suggested.
The interpass temperature should be held below 93ºC (200ºF) and excessive heating should be avoided, especially on thin parts.
The weld metal is viscous (sluggish) and therefore some torch manipulation is usually necessary. Increasing the current (amperage) will not substantially increase the fluidity of the weld puddle.
Post weld stress relieving at approximately 650ºC (1202ºF) is inappropriate for the Ni-Cr-Mo alloys. Normally a post-weld heat treatment is not necessary, but if stresses must be relieved, a full solution anneal at 1149ºC (2100ºF) is recommended, followed by water quenching.