Galvanized Steel Wire for Submarine & Undersea Cable Armouring

Submarine armour faces the harshest service of any cable wire, so every property is scrutinised. The challenges we address:

• Constant saltwater immersion that quickly corrodes any armour with a thin or poorly-adhered coating.
• Seabed abrasion and burial stress that demand controlled tensile strength and a tough surface.
• High tension during cable-laying that the armour must carry without failing.
• Strict third-party inspection and documentation that many wire suppliers cannot support.
• Coating mass and adhesion that must be verified, not just claimed, for a decades-long design life.

Undersea armour is judged on four things above all: coating mass, coating adhesion, surface smoothness and tensile consistency. Coating mass sets how much zinc there is to corrode before the steel is exposed; adhesion decides whether that zinc stays put through cable-laying and seabed movement; a smooth surface avoids the local thin spots where corrosion starts; and consistent tensile lets the armour share the laying load evenly across every wire.

These are the factors that decide whether a cable lasts its full design life in seawater, so we control them through the process rather than by sorting at the end. Constant saltwater immersion, seabed abrasion and the high tension of cable-laying all punish any weakness in them, which is why undersea projects specify and verify each one so carefully.

Coating uniformity is controlled by our ceramic zinc pot and nitrogen wiping, with post-coating cooling to lock in adhesion. Tensile strength is matched to your project standard, and salt-spray and coating-mass reports are available for verification.

For a cable meant to last thirty years on the seabed, undersea projects verify the armour rather than take it on trust, and we are set up to support that. Every batch can carry coating-mass, tensile and salt-spray reports, so the coating and strength that decide service life are documented rather than assumed, and traceable back to the coil they came from. That paper trail is often what separates a wire that can go on a funded marine project from one that cannot.

Where the project requires it, we arrange SGS, BV or customer-designated third-party inspection to witness testing and shipment, and we pack the wire for seaworthy export to the project site, often on the other side of the world. Agree the project standard and the inspection and documentation plan with us up front, and we will build, test and certify the wire to it, so the records the cable maker and the end client need are complete and consistent when the wire ships rather than reconstructed afterwards.

Submarine cable armour wire is produced to AS/NZS 4534, BS EN 10244-2, ASTM A641, JIS G 3547 or GB/T 15393, plus customer-specific test plans. Zhongbo manufactures to your project standard and supplies coating-mass, tensile and salt-spray reports, with SGS, BV or customer-designated inspection arranged on request. Share the project specification and we will confirm the coating class and documentation.

Submarine and undersea projects choose us because the coating is verified and the documentation is complete. What sets our wire apart:

• Standard, heavy and extra-high zinc coating options for the longest immersed service life.
• Coating uniformity and adhesion controlled by a ceramic zinc pot, nitrogen wiping and post-coating cooling.
• Tensile strength matched to the project standard for cable-laying and seabed stress.
• Coating-mass, tensile and salt-spray reports supplied for verification.
• Third-party inspection (SGS, BV or customer-designated) arranged, with seaworthy export packing.