How Does C71500 (70/30) Compare To C70600 (90/10 Cupro-Nickel)?

Yes, it is readily weldable. Common techniques include:

Gas Tungsten Arc Welding (GTAW/TIG): The preferred method for high-quality joints.

Gas Metal Arc Welding (GMAW/MIG): Also suitable.
It is critical to use matching filler metals, such as ERCuNi or 70/30 Cu-Ni electrodes, and to maintain proper shielding to prevent oxidation.

Common equivalent designations are:

EN (European): CW354H

DIN (German): 2.0882

BS (British): CN107

Common Name: CuNi30Fe

C71500 (70/30) generally offers superior corrosion resistance and mechanical strength compared to C70600 (90/10). It is more resistant to erosion-corrosion and is often chosen for more demanding service conditions. However, 90/10 Cupro-Nickel is less expensive and is perfectly adequate for many general seawater piping applications.

The hardness depends on the temper (annealed, half-hard, etc.). For annealed material, a typical Rockwell B hardness (HRB) is around 65 HRB. Hardness can be increased through cold working.

Positive identification requires a material test report (MTR/C of C). However, permanent markings on the pipe or tube itself, such as stenciling or stamped tags, should indicate the standard (e.g., SB-111, ASTM B111) and the alloy (C71500). Color coding is sometimes also used.

Gnee is a premier manufacturer and international supplier of comprehensive copper and copper alloy products, committed to delivering excellence in copper tubes, copper sheets, copper plates, copper bars, copper rods, copper wires, and copper strips.

Our Extensive Product Portfolio & Specifications:

Copper Tubes & Pipes:
We supply a full range including **Capillary Tubes, Thin-Walled Copper Tubes, Thick-Walled Copper Tubes, Round Pipes, Square Pipes, Rectangular Pipes, Welded Pipes, Seamless Pipes, Heat Exchanger Tubes, and Condenser Tubes.

Copper Sheets, Plates:
Our flat-rolled products cover Copper Foils, Thin Sheets, Thick Plates, and Circles (Round Plates) in various tempers (O, H) for diverse applications.

Copper Bars, Rods & Profiles:
We offer Round Bars, Square Bars, Hexagonal Bars, and Flat Bars with excellent machinability and strength.

Copper Wires & Strips:
Our lineup includes high-conductivity Bare Copper Wires, Stranded Wires, and precisely manufactured Copper Strips.

Common Alloys & International Standards:

We master a wide array of materials compliant with ASTM, EN, JIS, and GB standards:

Pure Copper: C11000 (ETP Copper), C10200 (Oxygen-Free Copper), C12000 (DLP)

Brass Alloys: C26000 (Cartridge Brass), C27200 (Brass), C28000 (Muntz Metal)

Copper-Nickel: C70600 (CuNi90/10), C71500 (CuNi70/30)

Phosphor Bronze: C51900, C52100, C54400

Serving industries from HVAC/R and plumbing to electrical, automotive, and marine engineering, Gnee provides OEM support, competitive pricing, and reliable bulk supply for your global projects.