Copper Nickel 70/30 Round Bar
➡️ CuNi 70/30 | UNS C71500 | EN CW354H
➡️ 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:
C71500
Wr. No.:
2.0882 (CW354H)
MTC Available:
EN 10204 3.1
Product Description for Copper Nickel 70/30 Round Bar
Copper Nickel 70/30 Round Bar is a solid cylindrical bar produced from copper-nickel alloy UNS C71500, containing nominally 70% copper and 30% nickel with a controlled iron addition. Rod and bar are supplied to ASTM B151 / B151M, and the European designation is CuNi30Mn1Fe (CW354H).
The higher nickel content relative to the 90/10 alloy gives greater strength, a higher tolerance to seawater flow velocity and improved resistance to corrosion in more aggressive and higher-temperature conditions. The alloy withstands seawater velocities of roughly 4.5 m/s in continuous service against about 3.0-3.5 m/s for 90/10, which makes it the preferred choice for high-velocity piping, pump internals and heat exchanger components where flow-induced attack would otherwise govern.
Like the 90/10 alloy, the material releases copper ions at a low rate and therefore resists biofouling without antifouling coatings or continuous chlorination, though the effect is somewhat weaker at the higher nickel content. It does not suffer chloride stress-corrosion cracking, and it holds up better than 90/10 in sulphide-polluted seawater.
Bar is supplied annealed or hard drawn in diameters from about 6 mm to 200 mm and lengths of 3 to 6 m. The alloy is a single-phase solid solution and cannot be hardened by heat treatment. It is non-magnetic and retains toughness at low temperature.
Typical applications include seawater piping fittings and valve components, condenser and heat exchanger tube sheets, pump and propeller shaft components, offshore and desalination hardware, brine heater parts, and marine and naval fittings.
Common Applications of Copper Nickel 70/30 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 70/30 Round Bar
Standard
Country / Region
Grade
ASTM B151 / B151M
USA
UNS C71500 - rod, bar and shapes
ASME SB151
USA
SB151 UNS C71500
EN 12163 / EN 12164
Europe / EU
CuNi30Mn1Fe (CW354H)
BS EN 12163
United Kingdom
CuNi30Mn1Fe (CW354H)
DIN 17664
Europe / EU
CuNi30Mn1Fe (2.0882)
JIS H3250
Japan
C7150
GB/T 13808
China
BFe30-1-1
Technical Specification for Copper Nickel 70/30 Round Bar
Specification
Value
Unit
Material
Copper-nickel alloy
-
Grade
Copper Nickel 70/30 / UNS C71500 / CW354H
-
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
760 - 870 followed by controlled cooling (typical)
deg C
Maximum Recommended Seawater Velocity
4.5 for continuous service (typical)
m/s
Maximum Continuous Service Temperature
350 (typical)
deg C
Tolerance Standard
ASTM B151 / B151M
-
Density
8.94 (typical)
g/cm3
Melting Range
1170 - 1240 (typical)
deg C
Thermal Conductivity
29 at 20 deg C (typical)
W/m.K
Coefficient of Thermal Expansion
16.2 at 20 - 300 deg C (typical)
micro-m/m.K
Specific Heat
377 at 20 deg C (typical)
J/kg.K
Electrical Resistivity
0.375 (typical)
micro-ohm.m
Electrical Conductivity
4.6 (typical)
percent IACS
Modulus of Elasticity
152 (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 70/30 Round Bar
Copper Nickel 70/30 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 CuNi30Mn1Fe (CW354H).
Material is ordered in a specified temper, most commonly annealed O60 for maximum ductility or hard drawn H04 for higher strength, with intermediate M30 and H01 tempers also standard. 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 all strengthening comes from cold work.
Annealing is carried out at approximately 760-870 deg C, higher than for the 90/10 alloy because of the greater nickel content. Correct annealing practice keeps the iron addition in solid solution, which is what provides resistance to impingement attack in flowing seawater.
The principal engineering advantage over 90/10 is tolerance to flow. The alloy withstands continuous seawater velocities of around 4.5 m/s, so it is specified for pump internals, high-velocity piping and heat exchanger inlet ends where local turbulence is unavoidable. It also performs better in sulphide-polluted seawater and at higher temperature.
Machining is more demanding than for the 90/10 alloy because the higher nickel content increases work hardening, so sharp tooling, positive rake and generous feeds are recommended.
Welding is straightforward using matching ERCuNi filler. Surfaces must be free of oil, grease and carbon residue, which cause porosity. Testing includes tensile testing to ASTM E8 / E8M.
Chemical Composition for Copper Nickel 70/30 Round Bar
Element
Symbol
Min
Max
Unit
Nickel including Cobalt
Ni
29.0
33.0
%
Iron
Fe
0.40
1.0
%
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 70/30 Round Bar
Nickel at 29.0-33.0% is the defining addition and roughly three times the level in the 90/10 alloy. It strengthens the copper matrix by solid solution, lifting tensile and yield strength well above the 90/10 level, and it improves corrosion resistance in more aggressive conditions, at higher temperature and in sulphide-polluted seawater. The higher nickel also raises the velocity at which the protective film remains stable, which is the main reason for selecting this alloy over 90/10.
Iron at 0.40-1.0% is lower than in the 90/10 alloy but serves the same essential purpose. Retained in solid solution by correct annealing, iron is incorporated into the protective cuprous oxide film and makes it more adherent and resistant to removal by turbulent flow. A lower addition is sufficient here because the higher nickel content already improves film stability.
Manganese up to 1.0% acts as a deoxidiser, 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 C71500. Those limits apply only to the closely related welding grade C71520, which caps phosphorus and sulphur at 0.02% and carbon at 0.05% to prevent surface carbon films that would promote local galvanic attack.
Copper makes up the balance at approximately 67-69%, and when all listed elements are determined the sum must be at least 99.5%. One trade-off: the higher nickel content weakens the copper ion release that gives biofouling resistance, so the antifouling effect is weaker than in the 90/10 alloy.
Mechanical Properties for Copper Nickel 70/30 Round Bar
Mechanical Property
Value
Unit
Tensile Strength (annealed O60 or M30, up to 12 mm)
360 (minimum)
MPa
Tensile Strength (annealed O60 or M30, over 12 to 25 mm)
330 (minimum)
MPa
Tensile Strength (annealed O60 or M30, over 25 mm)
310 (minimum)
MPa
Yield Strength at 0.5% Extension Under Load (annealed O60 or M30)
125 (minimum)
MPa
Elongation in 4 x diameter (annealed O60 or M30)
30 (minimum)
%
Tensile Strength (hard drawn H04, up to 12 mm)
550 (minimum)
MPa
Yield Strength at 0.5% Extension Under Load (H04, up to 12 mm)
415 (minimum)
MPa
Elongation in 4 x diameter (H04, up to 12 mm)
8 (minimum)
%
Tensile Strength (hard drawn H04, over 12 to 25 mm)
515 (minimum)
MPa
Yield Strength at 0.5% Extension Under Load (H04, over 12 to 25 mm)
400 (minimum)
MPa
Tensile Strength (hard drawn H04, over 25 to 50 mm)
485 (minimum)
MPa
Yield Strength at 0.5% Extension Under Load (H04, over 25 to 50 mm)
380 (minimum)
MPa
Elongation in 4 x diameter (H04, over 12 to 50 mm)
10 (minimum)
%
Hardness
Not specified by ASTM B151
HRB
Modulus of Elasticity
152 (typical)
GPa
Mechanical Properties
Check the key mechanical properties and performance requirements of CuNi 70/30 Round Bar
The values listed are the minima of ASTM B151 / B151M Table 6 for UNS C71500 round rod, and tensile properties are the basis of acceptance or rejection for all tempers of this alloy. Unlike the 90/10 grade, the annealed requirements are themselves size-dependent, falling from 360 MPa tensile at up to 12 mm, to 330 MPa at 12 to 25 mm, to 310 MPa above 25 mm, with a constant 125 MPa minimum yield strength and 30% minimum elongation throughout.
As with all copper alloys, yield strength is determined at 0.5% extension under load rather than by the 0.2% offset method used for steels, and the two bases are not directly interchangeable.
The hard drawn H04 temper gives 550 MPa tensile and 415 MPa yield at up to 12 mm, reducing to 515 and 400 MPa at 12 to 25 mm and 485 and 380 MPa at 25 to 50 mm, with elongation falling to 8-10%. An intermediate H01 temper is also standard. Larger bars take proportionally less cold reduction, so the requirements fall as the size goes up.
In the annealed condition the alloy is roughly 30 to 40% stronger than the 90/10 grade, a direct consequence of the higher nickel content in solid solution. It is a single-phase alloy and cannot be strengthened by heat treatment. ASTM B151 specifies no hardness requirement, and the 152 GPa modulus is around 75% that of steel.
Dimension / Sizes for Copper Nickel 70/30 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 70/30 Round Bar
Pricing for Copper Nickel 70/30 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 70/30 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
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