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CuNi30Mn1Fe (70/30 Copper-Nickel, High Alloy)

CuNi30Mn1Fe (70/30 Cupronickel) -- the highest-alloy standard marine copper-nickel. Superior seawater corrosion and biofouling resistance to 90/10 CuNi, for the most demanding seawater piping, offshore platform firewater systems and naval vessel piping.

Copper Alloys Copper-Nickel Alloy EN 12451CuNi30Mn1Fe / CW354H (tube) DIN W.NrCW354H UNSC71500 ASTMB111 C71500 (condenser/heat exchanger tube) +4
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Description

CuNi30Mn1Fe (CW354H / C71500) per EN 12451. Ni (29-33%) gives markedly better seawater corrosion resistance, higher strength and better resistance to high-velocity erosion-corrosion than 90/10 CuNi -- suitable for flow velocities up to 4-4.5 m/s versus 2.5-3 m/s for 90/10. Standard for offshore platform firewater ring mains, naval vessel seawater piping, and the most demanding desalination and power plant condenser applications.

Key Properties — Annealed (tube)
Rm (Tensile Strength)
360 – 500
MPa
Re / Rp0.2 (Yield)
140
MPa
A₅ (Elongation)
≥ 30.0
%
Hardness
90 – 130
HB
E (Young's Modulus)
150
GPa
Density
8.94
g/cm³
Main Designations (8)
Standard BodyDesignationCountry / RegionNote
EN 12451 CuNi30Mn1Fe / CW354H (tube) EU
DIN W.Nr CW354H Germany
UNS C71500 USA
ASTM B111 C71500 (condenser/heat exchanger tube) USA
BS EN CN108 / CW354H UK
MIL MIL-T-16420 (naval piping) USA Military
Trade 70/30 Copper-Nickel / Cupronickel 715 Global
JUS C.Ni30Mn1Fe Yugoslavia/BiH 70/30 Cu-Ni za brodske vodove; JUS B.C5.530
Standards (8)
#Standard BodyDesignationCountry / RegionNote
1 EN 12451 CuNi30Mn1Fe / CW354H (tube) EU —
2 DIN W.Nr CW354H Germany —
3 UNS C71500 USA —
4 ASTM B111 C71500 (condenser/heat exchanger tube) USA —
5 BS EN CN108 / CW354H UK —
6 MIL MIL-T-16420 (naval piping) USA Military —
7 Trade 70/30 Copper-Nickel / Cupronickel 715 Global —
8 JUS C.Ni30Mn1Fe Yugoslavia/BiH 70/30 Cu-Ni za brodske vodove; JUS B.C5.530
All values in wt.%
Cu
Copper
~67.5000
Ni
Nickel
29.0000 – 33.0000
Fe
Iron
0.4000 – 1.0000
Mn
Manganese
0.5000 – 1.5000
ElementSymbolMin %Max %Typical %
Copper Cu — — 67.5000
Nickel Ni 29.0000 33.0000 31.0000
Iron Fe 0.4000 1.0000 0.7000
Manganese Mn 0.5000 1.5000 1.0000
Mechanical Properties
ConditionCode Rm min
MPa		Rm max
MPa		 Re min
MPa		Re max
MPa		 A₅ min
%		 Z
%		 KV
J		 HB minHB max HRC minHRC max E
GPa
Annealed (tube) +O 360 500 140 — 30.0 — — 90 130 — — 150.0
Half Hard (H02) H02 420 580 320 — 15.0 — — 120 160 — — 150.0
Physical Properties
Density
8.940
g/cm³
Melting Point
1170–1240
°C
Young's Modulus
150.0
GPa
Poisson's Ratio
0.340
—
Thermal Conductivity
29.0
W/m·K
Thermal Expansion
16.20
×10⁻⁶ /K
Specific Heat
380
J/kg·K
Electrical Resistivity
0.3800
µΩ·m
Magnetic
No
 
Heat Treatment
Annealing
Temperature:700°C – 800°C
Medium:Inert or reducing atmosphere
Duration:20-60 min
Cooling:Air or water cool
Hardness After:HB 90-130
Stress Relief
Temperature:250°C – 350°C
Medium:Air oven
Duration:1-2 h
Cooling:Air cool
Hardness After:Minimal
After tube bending or forming.
NOT hardenable
Medium:Single-phase solid solution -- strength from Ni content and cold work only
Duration:N/A
Cooling:N/A
Hardness After:N/A
Iron addition (corrosion resistance function)
Medium:Fe (0.4-1.0%) forms protective iron-rich film enhancing erosion-corrosion resistance
Duration:N/A
Cooling:N/A
Hardness After:N/A
Same principle as in 90/10 CuNi -- essential alloying addition, not incidental.
Machinability
Machinability Rating
relative to AISI B1112 = 100%
30.0%
Very Difficult
Turning Speed (HSS)
150
m/min
Turning Speed (Carbide)
680
m/min
Feed Rate (Turning)
0.290
mm/rev
Drilling Speed (HSS)
125
m/min
Milling Speed (Carbide)
690
m/min
CoolantSoluble oil 5-8%
Chip FormationMedium ductile chips; more difficult than 90/10 CuNi due to higher Ni
Tool MaterialHSS M2; carbide K20
Surface FinishRa 0.8-3.2 um
Fair machinability -- more work-hardening than 90/10 CuNi.
Applications
Offshore Firewater
Offshore platform firewater ring main piping -- the most demanding standard CuNi application.
Naval Piping
Warship and naval auxiliary vessel seawater piping systems.
Power Plant Condensers
Condenser and heat exchanger tubing for the most aggressive seawater cooling duty.
Desalination
High-velocity seawater intake and brine piping in desalination plants.
Technical Notes
✅
70/30 vs 90/10 CuNi
90/10 CuNi (CuNi10Fe1Mn): adequate to 2.5-3 m/s flow velocity, lower cost, most common marine piping grade. 70/30 CuNi (CuNi30Mn1Fe): to 4-4.5 m/s, higher strength, better erosion-corrosion resistance, ~40% higher cost due to Ni content. Specify 70/30 for high-velocity sections (pump discharge, firewater ring mains) and 90/10 for the bulk of general seawater piping runs.