Copper Nickel 90/10 Round Bar
➡️ CuNi 90/10 | UNS C70600 | EN CW352H
➡️ ASTM, EN, JIS & International Standards
➡️ Supply Conditions
➡️ Multiple Diameters & Supply Lengths
➡️ Global Export & International Delivery
Country of Origin:
Europe, Japan, USA
Material Type:
Copper Nickel Alloy
UNS Number:
C70600
Wr. No.:
2.0872 (CW352H)
MTC Available:
EN 10204 3.1
Product Description for Copper Nickel 90/10 Round Bar
Copper Nickel 90/10 Round Bar is a solid cylindrical bar produced from copper-nickel alloy UNS C70600, containing nominally 90% copper and 10% nickel with controlled iron and manganese additions. Rod and bar are supplied to ASTM B151 / B151M, the specification for copper-nickel rod, bar and shapes, and the European designation is CuNi10Fe1Mn (CW352H).
The alloy is the workhorse material of marine engineering. Its resistance to seawater corrosion, erosion-corrosion and, importantly, to biofouling makes it the standard selection for seawater piping systems and heat exchangers. Copper ions released at a very low rate from the surface deter the settlement of barnacles, mussels and algae, so tube and pipe surfaces remain clean without antifouling coatings or continuous chlorination, a property no stainless steel or titanium possesses.
The iron content of 1.0-1.8% is essential. It is retained in solid solution by proper heat treatment and is what gives the alloy its resistance to impingement attack in flowing seawater. Manganese acts as a deoxidiser and contributes to erosion resistance.
Bar is supplied annealed or as-drawn in diameters from about 6 mm to 200 mm and lengths of 3 to 6 m. The alloy is not hardenable by heat treatment, so strength above the annealed condition comes from cold work. It is non-magnetic and retains good ductility at low temperature.
Typical applications include seawater piping fittings, valve and pump components, condenser and heat exchanger tube sheets, shipbuilding hardware, offshore platform firewater and ballast systems, desalination plant parts and marine fasteners.
Common Applications of Copper Nickel 90/10 Round Bar
➡️ Machined shafts, spindles, valve stems, pump sleeves and pins for food, beverage, dairy and pharmaceutical equipment, where the passive chromium oxide film resists both product acids and caustic clean-in-place chemicals.
➡️ Fasteners, studs, bolts, threaded rod and anchor components produced from bar stock, chosen for corrosion resistance combined with the ductility needed for cold heading and thread rolling.
➡️ Chemical, water treatment and general process plant parts such as agitator shafts, flange blanks, nozzles and support components handling water, steam and mildly corrosive media free of significant chlorides.
➡️ Architectural and structural hardware including handrail stanchions, balustrade fittings, tension rods and bollards, where a bright ground or polished bar finish provides both appearance and low maintenance.
International Equivalent Grade for CuNi 90/10 Round Bar
Standard
Country / Region
Grade
ASTM B151 / B151M
USA
UNS C70600 - rod, bar and shapes
ASME SB151
USA
SB151 UNS C70600
EN 12163 / EN 12164
Europe / EU
CuNi10Fe1Mn (CW352H)
BS EN 12163
United Kingdom
CuNi10Fe1Mn (CW352H)
DIN 17664
Europe / EU
CuNi10Fe1Mn (2.0872)
JIS H3250
Japan
C7060
GB/T 13808
China
BFe10-1-1
Technical Specification for Copper Nickel 90/10 Round Bar
Specification
Value
Unit
Material
Copper-nickel alloy
-
Grade
Copper Nickel 90/10 / UNS C70600 / CW352H
-
Product Form
Round bar / rod
-
Standard
ASTM B151 / B151M
-
Diameter
6 - 200 (available range)
mm
Length
3 - 6 (standard random or fixed)
m
Manufacturing Process
Hot extruded, hot rolled, forged or cold drawn
-
Production Route
Induction melting, casting, hot extrusion or rolling, cold drawing, annealing
-
Surface Finish
Hot-finished, cold-drawn bright, peeled, turned, ground, polished
-
Heat Treatment / Delivery Condition
Annealed (O60), light cold worked (M30 or H01) or hard drawn (H04) as ordered
-
Annealing Temperature
700 - 800 followed by controlled cooling (typical)
deg C
Maximum Recommended Seawater Velocity
3.0 - 3.5 for continuous service (typical)
m/s
Maximum Continuous Service Temperature
300 (typical)
deg C
Tolerance Standard
ASTM B151 / B151M
-
Density
8.94 (typical)
g/cm3
Melting Range
1100 - 1145 (typical)
deg C
Thermal Conductivity
40 at 20 deg C (typical)
W/m.K
Coefficient of Thermal Expansion
17.1 at 20 - 300 deg C (typical)
micro-m/m.K
Specific Heat
377 at 20 deg C (typical)
J/kg.K
Electrical Resistivity
0.19 (typical)
micro-ohm.m
Electrical Conductivity
9 (typical)
percent IACS
Modulus of Elasticity
124 (typical)
GPa
Magnetic Properties
Non-magnetic
-
Applicable Testing Standard
ASTM E8 / E8M, ASTM E18, ASTM E53, ASTM E75, ASTM E478
-
Certification / Inspection Documents
EN 10204 Type 3.1 or 3.2 mill test certificate
-
Technical Specifications
Get the key technical specifications for Copper Nickel 90/10 Round Bar
Copper Nickel 90/10 Round Bar is supplied to ASTM B151 / B151M for copper-nickel rod, bar and shapes, adopted by ASME as SB151 for pressure applications. In Europe the corresponding standards are EN 12163 and EN 12164 for CuNi10Fe1Mn (CW352H).
Material is normally ordered in one of two tempers. The annealed temper, designated O60 in ASTM B151, gives maximum ductility and formability with the lowest strength. The hard drawn temper, H04, gives higher tensile and yield strength through cold work, with reduced elongation. Intermediate M30 and H01 tempers are also standard, and tensile properties are the basis of acceptance for every temper of this alloy. The alloy is a single-phase solid solution and cannot be hardened by heat treatment, so only cold work raises strength.
Annealing is carried out at approximately 700-800 deg C. Correct annealing practice matters because the iron addition must remain in solid solution to deliver impingement resistance. If the material is heated so that iron precipitates as a separate phase, corrosion resistance in flowing seawater is reduced.
A key design constraint is seawater velocity. The protective film is mechanically removed above roughly 3.0-3.5 m/s in continuous service, leading to impingement attack, so piping systems are sized to stay below this limit and abrupt changes of section that cause local turbulence are avoided.
The alloy machines well with free-cutting practice and is readily welded and brazed. Testing includes tensile testing to ASTM E8 / E8M and chemical analysis to the applicable ASTM copper alloy methods.
Chemical Composition for Copper Nickel 90/10 Round Bar
Element
Symbol
Min
Max
Unit
Nickel including Cobalt
Ni
9.0
11.0
%
Iron
Fe
1.0
1.8
%
Manganese
Mn
-
1.0
%
Zinc
Zn
-
1.0
%
Lead
Pb
-
0.05
%
Copper including Silver
Cu
Remainder
Remainder
%
Chemical Composition
View the chemical composition and applicable material limits for CuNi 90/10 Round Bar
Nickel at 9.0-11.0% is the primary alloying addition. It strengthens the copper matrix by solid solution, but the bigger change is to the corrosion behaviour. The alloy handles seawater, brackish water and many neutral chloride solutions that would attack unalloyed copper. Nickel also raises the temperature capability and improves resistance to dealloying.
Iron at 1.0-1.8% is what determines performance in flowing seawater. When retained in solid solution by correct annealing practice, iron incorporates into the protective cuprous oxide film and makes it far more adherent and resistant to mechanical removal by turbulent flow. Without this addition the alloy would suffer impingement attack at modest velocities. If iron precipitates out as a separate phase through incorrect heat treatment, the benefit is lost.
Manganese up to 1.0% acts as a deoxidiser during melting, ties up residual sulphur and contributes to erosion resistance.
Zinc is limited to 1.0% as a residual, and lead to 0.05% because lead segregates to grain boundaries and causes hot shortness during hot working and welding.
ASTM B151 sets no phosphorus, sulphur or carbon limits for C70600. Those limits apply only to the closely related welding grade C70620, which caps phosphorus and sulphur at 0.02% and carbon at 0.05%. Excess carbon picked up from graphite crucibles or lubricant residues can form a surface film that promotes local galvanic attack, and that is what the welding grade is controlling for.
Copper makes up the balance at approximately 87%, and when all listed elements are determined the sum must be at least 99.5%.
Mechanical Properties for Copper Nickel 90/10 Round Bar
Mechanical Property
Value
Unit
Tensile Strength (annealed O60 or M30, all sizes)
260 (minimum)
MPa
Yield Strength at 0.5% Extension Under Load (annealed O60 or M30)
105 (minimum)
MPa
Elongation in 4 x diameter (annealed O60)
30 (minimum)
%
Tensile Strength (hard drawn H04, up to 9.5 mm)
415 (minimum)
MPa
Yield Strength at 0.5% Extension Under Load (H04, up to 9.5 mm)
260 (minimum)
MPa
Tensile Strength (hard drawn H04, over 9.5 to 25 mm)
345 (minimum)
MPa
Yield Strength at 0.5% Extension Under Load (H04, over 9.5 to 25 mm)
205 (minimum)
MPa
Tensile Strength (hard drawn H04, over 25 to 80 mm)
275 (minimum)
MPa
Yield Strength at 0.5% Extension Under Load (H04, over 25 to 80 mm)
105 (minimum)
MPa
Tensile Strength (hard drawn H04, over 80 to 125 mm)
260 (minimum)
MPa
Hardness
Not specified by ASTM B151
HRB
Modulus of Elasticity
124 (typical)
GPa
Impact / Charpy V-Notch
Not required by ASTM B151 unless specified
J
Mechanical Properties
Check the key mechanical properties and performance requirements of CuNi 90/10 Round Bar
The values listed are the minima of ASTM B151 / B151M Table 6 for UNS C70600 round rod, and tensile properties are the basis of acceptance or rejection for all tempers of this alloy. In the annealed O60 or M30 temper the requirements are 260 MPa minimum tensile strength and 105 MPa minimum yield strength, applying to all sizes.
Two points on how the standard reports properties. First, yield strength for copper alloys is determined at 0.5% extension under load, not by the 0.2% offset method used for steels, so values from the two systems are not directly interchangeable. Second, the hard drawn H04 requirements are strongly size-dependent, falling from 415 MPa tensile and 260 MPa yield at up to 9.5 mm, through 345 and 205 MPa at 9.5 to 25 mm, to 275 and 105 MPa at 25 to 80 mm. This is because larger bars receive proportionally less cold reduction. The temper and the size must therefore be read together.
The alloy is a single-phase solid solution and cannot be strengthened by heat treatment, so cold work is the only route to higher strength. ASTM B151 does not specify a hardness requirement for this alloy.
Strength is modest compared with steel and the modulus of 124 GPa is roughly 60% that of steel, so the material is selected for corrosion and antifouling performance rather than load capacity.
Dimension / Sizes for Copper Nickel 90/10 Round Bar
Dimension / Size
Value
Unit
Diameter (available range)
6 - 200
mm
Standard Length
3 - 6
m
Custom Length
Cut to length on request
-
Diameter Tolerance
Per ASTM B249 / B249M as referenced by ASTM B151
-
Length Tolerance
Per ASTM B249 / B249M as referenced by ASTM B151 or as agreed
-
Straightness Tolerance
Per ASTM B249 / B249M as referenced by ASTM B151 or as agreed
-
End Condition
Square cut, saw cut, chamfered or as ordered
-
Surface Finish
Hot-finished, cold-drawn bright, peeled, turned, ground, polished
-
Cut-to-Length Availability
Available
-
Dimensional Standard
ASTM B151 / B151M
-
Dimensions & Sizes
Explore available diameters, lengths, and dimensional requirements for CuNi 90/10 Round Bar
Pricing for Copper Nickel 90/10 Round Bar
Round Bar Prices are generally quoted per kilograms or meters tonnes and can fluctuate with the global raw material and market prices. The final price will depend on a variety of factors, including the grade size, diameter, length, surface finish, the quantity and whether the bars are cut to length or in standard lengths.
For smaller quantities, we can also quote per metre or per piece basis once the required dimensions have been confirmed. Container-loads or orders that are larger in size are typically priced per tonne, based upon the specifications required and the supply conditions.
Please provide your desired dimensions, grades, length number, and end for a current quote including the lead time applicable and details for certification.
Pricing
Get current Copper Nickel 90/10 Round Bar pricing based on size, quantity, grade, finish, and delivery requirements.
Why Choose Us
Euro Steel Bars is an international distributor, stockist and exporter of stainless round steel bars that cover carbon, stainless alloy, special grades. We stock a variety of sizes and grades. We guarantee every order with mill test certificates as well as full quality-assurance documentation. Our name speaks to our roots: European-sourced materials that is backed by the certificates and rigor that buyers from Asia as well as the Gulf and Africa are looking for.
Each bar we deliver is accompanied by EN 10204 3.1 mill test certificates as well as complete documentation of quality, so what you receive corresponds to what’s written in the documents. We carry a selection of sizes and grades ready for transport, and cut length upon the request of customers, which results in quicker lead times, whether you’re ordering just a one-off spec or a complete project tonnage.
We operate an actual wholesale business that is that is supported with an internationally-operated supply chain therefore we are able to serve fabricators sourcing one grade the same way in the same way as an EPC contractor who is placing a large order. Our clients include manufacturers, fabricators EPC construction companies, engineers oil and gas projects as well as construction companies. we design our inventory as well as documentation to show what buyers need to bring projects forward.
Our customers trust us across Qatar, Oman, Bahrain, Kuwait, Jordan, Malaysia, Singapore, Thailand, Taiwan, Turkey, Italy and South Africa. If you’re looking to source an Gulf energy project, or a construction project within Southeast Asia, you get the same quality of certified material, the exact documentation, and the exact delivery procedure.
Frequently Asked Questions
What's Inside Copper Nickel 90/10 Alloy?
What Size Round Bar Options Are Available for Copper Nickel 90/10?
What's the Density of Copper Nickel 90/10?
Is Copper Nickel 90/10 Magnetic?
Is Copper Nickel 90/10 Corrosion Resistant?
What Industries Use Copper Nickel 90/10 Most?
What Certifications Should Copper Nickel 90/10 Have?
How Much Does Copper Nickel 90/10 Round Bar Cost and What's the Price Per Pound Today?
Where Can I Buy Copper Nickel 90/10 Round Bar Stock?
Is Copper Nickel 90/10 Rare or Hard to Find?
How Do I Know If My Round Bar Is Really Copper Nickel 90/10?
What's the Difference Between CuNi 90/10 and 70/30?
Does Copper Nickel 90/10 Require Special Storage?
Request A Quote
Need a specific grade, size or quantity? Get pricing and availability for your requirement.