Thermalloy C-700 - Copper Alloys

Characteristics

High Strength: Can be manufactured to a range of high strength properties depending on the customer’s requirements.
High hardness: High modulus of elasticity compared with other copper based alloys. No embrittlement at sub-zero temperatures.
Corrosion Resistant: High resistance to seawater corrosion and industrial atmospheres. Excellent all-round corrosion resistance. Immune to hydrogen embrittlement.
High Conductivity: Exhibits both high heat and electrical conductivity properties.
Biofouling resistant: Effectively resists the deposition and build-up of marine organisms.
Low Magnetic Permeability: Virtually non-magnetic.
Excellent anti-galling and wear resistant properties: Very resistant to pick-up even against stainless steel.
Good machinability: Easily machined to an extremely fine finish and close tolerances. Good dimensional stability.
Non Sparking: An important property when the component is in contact with potentially explosive environments.
Uniform Fine Grain Structure: Detailed ultrasonic inspection – most ultrasonic procedures / acceptance criteria accommodated to ensure material is sound. Uniformity of mechanical and physical properties.

The Elite Thermal Alloys benefit from a unique combination of properties make it the ideal material choice for equipment requiring high strength and high conductivity.

The Elite Thermal Alloys have been designed by our renowned metallurgists to give an advantage to engineers working in extreme environments.

Specifying Elite Thermal Alloys will reduce reliance on toxic high cost materials such as beryllium copper.

Performance can be improved and service life extended by using these alloys, resulting in significant cost advantages in oilfield exploration and processing, moulding applications, fine measurement tooling and other applications where high wear resistance and conductivity are important.

Specify the Elite Thermal Alloys to lock-in these benefits.

Mechanical & Conductivity Properties
Copper-Nickel-Chromium-Silicon-Alloy
CuNi2SiCr

Mechanical and Physical properties	Units	CAL C700 CuNi2SiCr	CuBe2
Tensile Strength Rm	N/mm² Ksi	700 102	1206 175
Yield Strength Rp 0.2%	N/mm² Ksi	600 87	1034 150
Elongation	%	15	5
Hardness Brinell	HB30	185	365
Rockwell Hardness	HRC	18	39
Electrical Conductivity	% I.A.C.S.	48	22
Thermal Conductivity 20ºc/68ºF	W/mK Btuft /hr.ft².ºF	208 120	113 65

Rod, Bar and Tube for Standard Tempers

Applications

This family of alloys, in addition to its corrosion resistance in sea water it can be used in most industrial atmospheres and can be used for components coming into contact with non-oxidising acids and salt solutions.

They can also be used at sub zero temperatures where it does not suffer with embrittlement at low temperatures as do many of the steels.

They can be machined to a high tolerance and surface finish and are much easier to process then some of the harder tool steels.

CAL C700 with the addition of Chromium has the highest heat and thermal conductivity and can be heat treated to meet the requirements of Class 3 RWMA.

CAL C700 is also able to maintain its superior electrical and heat conductivity properties up to 600° C (1112°F)

Carefully controlled adjustments in composition and process parameters result in the three distinct Elite Thermal Alloys. This gives designers the opportunity to optimise material selection for their particular applications.

Marine applications requiring high strength coupled with excellent corrosion resistance.
Aerospace components, such as landing gear bushings and sleeves and bearing retainer rings. .
It can be used in the manufacture of mould components for the plastic, Zinc and Aluminium injection die casting market where its high heat conductivity over conventional tool steels offers distinct advantages for high production rates.
The alloy is utilised extensively in the motor racing circuit for valve guides and valve seats where high strength, wear and conductivity are important properties.
It is also used for electrical application in welding, for electrode holders, spot electrodes, projection and butt welding dies principally for stainless steel and Monel.
Other electrical applications include heavy duty switch gear components where greater strength is required than conventional high conductivity copper.
For high stressed structures and wear resistant parts such as bevel gears, worm wheels, valves, bolts and general fasteners.

Chemical Composition

Copper-Nickel-Chromium-Silicon-Alloy
CuNi2SiCr

Alloy	Copper Alloy UNS Number	Cu	Ni	Si	Cr
CAL C700	C18000	Bal	1.8-3.0	0.4-0.8	0.1-0.8

Availability and Formats

The Elite Thermal Alloys can be supplied in the form of forgings, rounds, blocks, rings and tube to a maximum piece weight of 6000kgs.

The product can also be supplied in bar form in standard lengths.

Copper Alloys is experienced in fully machined components designed for the most extreme engineering applications and can support with turnkey precision machined components.

The Elite Alloys come in three groups:

Bars (square/flat/round) from 10mm to 500mm (0.375″-20″) in section
Forgings (to 5 Tonnes): Blocks/Rings to 2400mm (8ft) outer ø / Shafts to 7M (23ft) long / Discs to 1250mm (50″) ø
Proof machined or fully machined components

Physical Properties

Copper-Nickel-Chromium-Silicon-Alloy
CuNi2SiCr

Mechanical and Physical properties	Units	CAL C700 CuNi2SiCr	CuBe2
Youngs of elasticity	N/mm² Ksi	140 x10³ 20.3 x10³	132 x10³ 19.2 x10³
Modulus of Rigidly	N/mm² Ksi	550 x10² 79.8 x10²	489 x10² 71 x10²
Compressive strength 0.1% perm set	N/mm² Ksi	552 80.6	896 130
Density ρ	g/cm³ lbs/in³	8.71 0.3147	8.25 0.3
Coefficient of expansion α 20-300°C	10ˉ6 /K 10ˉ6 /F	17.5 9.7	18 10
Thermal Conductivity 200ºc/392 ºF	W/mºK Btuft /hr.ft².ºF	211 122	138.5 80
Electrical Conductivity	m/Ω.mm² in/ Ωin²	28.00 1102	11.6 457
Electrical Resistivity	μ Ωcm μ Ωin	3.6 1.42	8.6 3.4
Specific Heat	20ºC J/kg/°K BTU/lb°F	377 0.09	419 0.1
Magnetic Permeability	μr	<1.001	<1.001
Melting Point	ºC ºF	1040-1060 1904-1960	866-982 1590-1800

Additional information can be provided upon request

Corrosion Resistant

High resistance to seawater corrosion and industrial atmospheres.
Excellent all-round corrosion resistance.
Immune to hydrogen embrittlement.

	CAL C700
General Corrosion Rates mm/year	0.02-0.08
Crevice Corrosion Rates mm/year	0.02
Select Phase Corrosion	None
Impringement resistance limits m/ses	3.2
Corrosion Potential in sea water	-0.25
Marine Bio- Fouling Resistance	Resistant

Mechanical Properties

Copper-Nickel-Chromium-Silicon-Alloy
CuNi2SiCr

Properties	Units	Guaranteed	Typical
0.2% Proof Stress	N/mm² Ksi	600 87	600-750 87-109
Tensile Strength (UTS)	N/mm² Ksi	700 102	700-850 102-123
Elongation	%	15	15-30
Hardness	HB	185	185-230

Every batch of forgings is certified to BS EN 10204.3.1 as standard using prolongated test pieces selected from each batch of forgings.

All material can be supplied ultrasonically tested to international requirements.

Copper Alloys manufactures a number of alloys in the CuNiSi family which exhibit varying properties of strength and conductivity to suit customer’s requirements.

Inspection and Certification

Full chemical analysis performed on every cast to ensure compliance with table 1.

Each batch (same size/same cast/same process-run) is mechanically tested to ensure compliance with minimum mechanical property requirements in table 2, which exceed the generic specification requirements.

100% ultrasonic inspection as standard – most test standards and acceptance criteria can be accommodated. Certification provided as standard in both wet-signed and electronic form (soft-copy) in accordance with EN 10204 type 3.1. 3.2 Certification can also be provided.

Detailed Specifications

Copper-Nickel-Chromium-Silicon-Alloy
CuNi2SiCr

Specification	CAL C700 CuNi2SiCr CuNi2Si
UK
EUROPEAN
GERMANY	CUNi2Si 2.0855
USA	C18000 RWMA Class 3