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Non-Ferrous Metals · Tubes · ASTM B111 / ASME SB111

Cupro-Nickel 70/30 Tubes

In short: CuNi 70/30 tube to ASTM B111 is used for condensers and heat exchangers with higher seawater velocities or polluted water, where 90/10 would erode.

C71500
UNS number
8.95
density, g/cm³
3.1 / 3.2
EN 10204 certificates
1
Cupro-Nickel 70/30 product forms
Quote Cupro-Nickel 70/30 tubes →Sizes and weights
Cupro-Nickel 70/30 tube weightCalculated at 8.95 g/cm³: 6.4×0.89 0.14 kg/m; 9.5×1.24 0.29 kg/m; 12.7×1.24 0.40 kg/m; 12.7×1.65 0.51 kg/m; 15.9×1.24 0.51 kg/m; 19.1×1.65 0.81 kg/m; 19.1×2.11 1.01 kg/m; 25.4×1.65 1.10 kg/m; 25.4×2.11 1.38 kg/m; 31.8×1.65 1.40 kg/m; 38.1×1.65 1.69 kg/m; 38.1×2.11 2.14 kg/m. Cupro-Nickel 70/30 tube weight8.95 g/cm³ 6.4×0.89: 0.14 kg/m6.4×0.899.5×1.24: 0.29 kg/m9.5×1.2412.7×1.24: 0.40 kg/m12.7×1.2412.7×1.65: 0.51 kg/m12.7×1.6515.9×1.24: 0.51 kg/m15.9×1.2419.1×1.65: 0.81 kg/m19.1×1.6519.1×2.11: 1.01 kg/m19.1×2.1125.4×1.65: 1.10 kg/m25.4×1.6525.4×2.11: 1.38 kg/m25.4×2.1131.8×1.65: 1.40 kg/m31.8×1.6538.1×1.65: 1.69 kg/m38.1×1.6538.1×2.11: 2.14 kg/m38.1×2.11 2.1 OD × wall, mm · kg/m
Calculated values for estimating; actual weights vary within tolerances.

Why this combination

Why Cupro-Nickel 70/30 in tubes

About 30% nickelHigher strength than 90/10Better erosion and polluted-water resistanceUsed for condensers and feedwater heaters

The higher nickel content gives better resistance to erosion-corrosion and to some polluted waters.

It is common in naval condensers and high-duty coolers.

Specification

How to specify Cupro-Nickel 70/30 tubes

OD 3 mm to about 127 mm (¼" to 5") typical, wall 0.5 mm to 12 mm; BWG or mm; straight lengths up to about 30 m, U-bent to drawing

Cupro-Nickel 70/30 tubes ASTM B111 / ASME SB111
Cupro-Nickel 70/30 tubes: ASTM B111 / ASME SB111
Specification
ASTM B111 / ASME SB111
UNS
C71500
EN / W.Nr.
CW354H
Designation
UNS C71500

Sizes and weights

Cupro-Nickel 70/30 tubes sizes, weighed at 8.95 g/cm³

Other sizes on request. For general tubes information, such as manufacturing routes and end finishes, see the tubes guide.

Cupro-Nickel 70/30 tube weights at 8.95 g/cm³
OD mmWall mmkg/m
6.350.890.137
9.531.240.289
12.701.240.400
12.701.650.513
15.881.240.510
19.051.650.807
19.052.111.005
25.401.651.102
25.402.111.382
31.751.651.396
38.101.651.691
38.102.112.135
50.802.112.889
50.802.773.741

Chemistry

Cupro-Nickel 70/30 composition

UNS
C71500
EN / W.Nr.
CW354H
Density
8.95 g/cm³
Cupro-Nickel 70/30 chemical composition, % (ASTM B111)
ElementLimit, %Why it matters
CuBalance
Ni + Co29.0 – 33.0
Fe0.40 – 1.0
Mn1.0 max
Zn1.0 max
Pb0.05 max

Limits per ASTM B111; other product forms and specifications differ slightly. Your order's specification and edition govern.

0%5%10% Mn Zn
Main alloying elements of Cupro-Nickel 70/30: bars show the permitted range (ASTM B111).

Questions

About Cupro-Nickel 70/30 tubes

Why choose 70/30 over 90/10?

Higher velocity tolerance and better resistance in some polluted waters.

Is 70/30 tube more expensive?

Yes, because of its higher nickel content.

From enquiry to dispatch

How a Cupro-Nickel 70/30 tubes order runs

  1. 01 EnquiryGrade, specification, size, quantity
  2. 02 ReviewChecked against your standard
  3. 03 InspectPMI, dimensions, TPI if required
  4. 04 CertifyEN 10204 3.1 / 3.2, heat traceable
  5. 05 ShipPacked and documented for the destination

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