Copper-clad steel wire manufacturing
Copper-Clad Steel & Specialty Wire: ASTM B452/B229 Certified

Copper-clad steel conductors drawn to ±1 µm.

IACS 21%-55% conductivity grades. Tin, silver, nickel and enameled coatings. Delivered on-spec to automotive, telecom, and power OEMs across 10+ countries.

ASTM B452ASTM B227ASTM B229IEC 62561-2ISO 9001:2015
20+
Years manufacturing
10+
Countries served
±1μm
Diameter tolerance
99.6%
On-time delivery
Product Portfolio

Three product families. One tolerance standard.

Every reel is inspected against ASTM cross-section, elongation, and adhesion criteria before it leaves the factory.

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RAS Thermal headquarters and manufacturing facility
Inside the Factory

Vertically integrated from billet to reel.

Continuous cladding, in-line eddy-current testing, and micrograph sampling on every production run, the same discipline whether you need 500 kg of trial material or a 200-tonne annual contract.

  • Copper bond strength verified per ASTM B452 §9
  • Optical micrograph on 100% of prototype lots
  • Full traceability from steel heat to shipping reel
  • In-house salt-spray and thermal-cycle chambers
What it is Copper-clad steel (CCS) wire is a bimetallic electrical conductor that bonds a continuous…
Copper-clad steel (CCS) wire is a bimetallic electrical conductor that bonds a continuous copper cladding to a high-strength steel core, combining the surface conductivity of copper with the tensile strength of steel at 40-60% lower material cost than solid copper. Because alternating current travels near the conductor surface, a CCS wire performs like solid copper above roughly 1 MHz while weighing and costing far less. RAS Thermal is a dedicated CCS manufacturer producing 21%, 30%, 40% and 55% IACS grades, tin/silver/nickel/enamel coated conductors and stranded CCS cable for OEMs in 10+ countries. Unlike general wire mills that run CCS as one of hundreds of stock items, RAS Thermal is a single-product operation: 100% of line hours vs. the minority share CCS receives at multi-product mills, and 20+ years of process data from one alloy system feeding directly into today's tolerance windows. Every reel is 100% inspected to ASTM B452 and ships with a Mill Test Certificate traceable to heat number and run hour.

Experience

20+ years focused solely on CCS wire

Countries Served

10+

Inspection

100% of reels, ASTM B452/B227/B229

Quote Response

Within 24 hours

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Frequently Asked Questions (FAQ)

How do you qualify a CCS conductor for automotive harness use?

We follow USCAR-2 crimp qualification, IATF 16949-aligned PPAP Level 3 documentation, and a 500-hour thermal cycle validation. Sample reels ship within 10 days for pilot-line testing.

What is the difference between CCS wire and CCA wire?

CCS uses a steel core for tensile strength (600-1400 MPa) and theft deterrence, while copper-clad aluminium (CCA) uses an aluminium core for minimum weight. At 40% IACS the two conduct alike at radio frequencies, but CCS survives messenger spans, crimping and repeated flexing where CCA breaks. RAS Thermal produces both material systems and advises on the trade-off per application.

Which industries buy RAS Thermal CCS conductors?

Telecom and CATV (coaxial center conductors, messenger strand), power utilities (substation grounding grids, overhead ground wire), automotive (engine and antenna harnesses), and industrial electronics (connector pins, jumper leads). OEMs in 10+ countries requalify us on 2-3 year audit cycles.

How is copper-clad steel material cheaper to install than solid copper?

Because aluminium and steel cores let CCS deliver equivalent current-carrying capacity at lower metal cost and weight, large-diameter grounding and antenna runs use less conductor material. RAS Thermal draws CCS to the same diameters as copper, so existing tooling and termination methods carry over without re-engineering.

Which IACS grades does RAS Thermal produce and where is each grade used?

RAS Thermal produces four verified grades: 21% IACS (1200-1400 MPa) for overhead ground wire and lightning arrest, 30% IACS (900-1100 MPa) for substation grounding and CATV messenger, 40% IACS (700-900 MPa) for coaxial center conductor and CATV drop, and 55% IACS (600-800 MPa) for high-frequency RF and automotive harness. Tin, silver, nickel and enamel coatings (1-15 μm) are available across the 0.05-3.00 mm coated range.

Standards & References

ASTM International · ISO 9001 Quality Management · IEC

Have a spec sheet in hand?

Send it over. A RAS Thermal application engineer will benchmark your requirement against our current production window and quote within one business day.