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

Associated Links Alloy C-276

Introduction

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.

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Chemical Composition (%)

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Corrosion Resistance

To follow

Designations

UNS N06200

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Specifications

ASTM Specifications B564, B574, B575, B619, B626, B366

ASME Code Case 2240

DIN Specifications 17744 No. 2.4675 and NiCr23Mo16Cu

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Physical Properties

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)

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Mechanical Properties

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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Fabrication

Heat Treatment

No information

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Forming

No information

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Welding

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.

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