Metal wire inspection service

Metal Wire Inspection Service for Global Industrial Supply Chains

As an ISO/IEC 17025 accredited laboratory, we deliver a rigorous metal wire inspection service that verifies chemical composition, mechanical strength, coating quality, surface integrity, and dimensional accuracy. Our metal wire inspection service supports manufacturers, exporters, and procurement managers who must demonstrate conformity to ASTM, ISO, EN, and JIS standards across the European Union, North America, the Middle East, and Asia. Every test is performed under our CNAS-accredited quality system, producing reports that are accepted by notified bodies, customs authorities, and major industrial buyers worldwide.

Product Samples We Regularly Test in Our Metal Wire Inspection Service

Carbon steel and low-alloy drawn wire — for fasteners, fencing, wire rope, and general engineering
Stainless steel wire — AISI 304, 316, and 302 grades for springs, medical devices, and woven mesh
Copper and copper alloy wire — electrical conductors, telecommunications cable, and transformer windings
Aluminum and aluminum alloy wire — overhead transmission lines, magnet wire, and mechanical applications
Galvanized and zinc-aluminum coated steel wire — for gabions, stay wire, ACSR, and agricultural fencing
Welding wire and filler metals — solid MIG wire, flux-cored wire, and TIG rods for structural fabrication
Music wire and oil-tempered spring wire — for automotive suspension, engine valves, and industrial springs
Cold heading quality wire — for bolt, screw, and rivet manufacturing
Prestressing steel wire and strand — for concrete reinforcement in bridges, buildings, and railways
Nickel and titanium alloy wire — for aerospace, chemical processing, and orthopaedic implants

Chemical Composition and Material Verification in Our Metal Wire Inspection Service

Optical emission spectrometry for alloy grade confirmation — the elemental composition of the wire is analysed according to ASTM E415 and ISO 14284 to verify conformance to the specified grade, such as AISI 316, C1010, Cu-ETP, or Al 1350, providing a full quantitative report of alloying and residual elements.
Carbon and sulfur determination by combustion — LECO combustion analysis per ASTM E1019 quantifies the carbon and sulfur content in carbon steel and low-alloy wire to ensure weldability, hardenability, and cold forming behaviour meet the ordered specification.
Nitrogen and oxygen analysis by inert gas fusion — for stainless and high-alloy wire, the nitrogen and oxygen levels are measured per ASTM E1409 to confirm the stabilisation of austenitic structure and freedom from detrimental oxide inclusions.
Positive material identification on finished wire — handheld XRF or portable OES is used directly on the wire coil to prevent material mix-ups during storage and shipping.

Mechanical and Tensile Testing of Metal Wire

Tensile strength, yield point, and elongation measurement — testing per ISO 6892-1 and ASTM E8 determines the ultimate tensile force, proof stress, and percentage elongation of the wire, providing the fundamental mechanical property data against the required strength class or temper designation.
Simple torsion and reverse bend testing — according to ISO 7801 and ISO 9649, the wire is twisted to failure or bent repeatedly over a specified radius to evaluate its ductility, surface soundness, and resistance to cracking, essential for cold heading and spring applications.
Wrapping and coiling tests — the wire is wound around a mandrel of defined diameter per ISO 7802 and ASTM A370 to verify that the coating and base metal can withstand forming without flaking or cracking, a critical pass/fail test for galvanized and plated wire.
Hardness testing of wire cross-sections — Vickers microhardness per ISO 6507-1 is measured on polished and etched cross-sections to map hardness gradients from surface to core, verifying uniform heat treatment and case depth in quenched and tempered wire.
Fatigue and rotating beam endurance testing — per ISO 1143, the wire is subjected to cyclic bending stress to generate S-N curves, validating the fatigue life of spring wire and structural wire used under dynamic loading.
Creep and stress relaxation for prestressing wire — constant load testing per ISO 15630-3 measures the relaxation loss over 1000 hours to guarantee the long-term preload retention in post-tensioned concrete structures.

Coating Mass, Adhesion, and Corrosion Resistance Evaluation in Our Metal Wire Inspection Service

Zinc coating mass by gravimetric and coulometric methods — per ASTM A90/A90M and ISO 1460, the mass of zinc per unit surface area is determined by stripping the coating in a controlled acid solution and weighing the wire before and after, or by measuring the anodic dissolution charge for electrolytic coatings, verifying compliance with EN 10244 coating classes.
Coating thickness by magnetic and microscopic measurement — magnetic induction per ISO 2178 or optical microscopy on cross-sections per ISO 1463 quantifies the local coating thickness and uniformity, ensuring the specified minimum thickness for each corrosion protection class is met.
Neutral salt spray corrosion resistance — per ISO 9227 and ASTM B117, the coated wire is exposed to continuous salt fog for 240 to 2000 hours, and the time to first red rust or white corrosion is recorded to rank the protective life in coastal, industrial, and rural environments.
Coating adhesion and adhesion after mechanical deformation — wrap tests and Erichsen cupping tests per EN 10244-2 and customer protocols verify that the zinc or Zn-Al coating does not crack or detach when the wire is bent, twisted, or drawn.
Phosphate and conversion coating weight — for cold heading wire, the phosphate coating mass is measured by stripping and weighing per ASTM D2092 to ensure consistent lubrication during high-speed bolt forming.

Dimensional, Surface, and Geometrical Inspection in Our Metal Wire Inspection Service

Wire diameter, ovality, and roundness measurement — laser micrometer, digital calliper, and optical comparator per ISO 6507 and ASTM A510 verify that the wire diameter lies within the specified tolerance class and that ovality does not exceed permissible limits for the intended drawing or forming process.
Surface defect detection by eddy current and visual inspection — encircling coil eddy current systems per ASTM E426 and ISO 12718 detect surface-breaking cracks, laps, seams, and slivers at speeds exceeding 200 metres per minute, with automatic marking of defects for removal or downgrading.
Surface roughness and finish evaluation — stylus profilometry per ISO 4287 measures Ra and Rz on the wire surface to verify that the specified bright, dull, or drawn finish has been achieved and is suitable for the subsequent coating, plating, or welding process.
Cast and helix measurement — the natural curvature of the wire when released from the coil is measured per ASTM A510 and EN 10016 to ensure the wire will feed straight through automated forming, cutting, and spring coiling machinery.

Specialized Testing for Welding Wire and Filler Metals Within Our Metal Wire Inspection Service

Chemical composition of the wire electrode and deposited weld metal — analysis of the wire itself per ASTM E415 and analysis of the all-weld-metal deposit per AWS A5.18 and ISO 14171 ensure the filler metal chemistry produces the specified mechanical and corrosion properties in the welded joint.
Cast and helix for MIG and TIG wire — per AWS A5.18 and EN 12070, the wire cast diameter and helix height are measured to guarantee smooth feeding through the welding torch liner without bird-nesting or erratic arc behaviour.
Copper coating thickness and adhesion on welding wire — the copper flash coating on solid MIG wire is measured per ISO 1460 and tested for flaking during a defined feed test, ensuring consistent electrical contact in the contact tip and preventing copper particle contamination of the weld.
Moisture content and diffusible hydrogen testing — for flux-cored and metal-cored wires, the moisture in the flux is measured per AWS A4.4M and the diffusible hydrogen in the deposited weld metal is determined per ISO 3690 to ensure the filler metal meets the H4 or H8 hydrogen classification for crack-free fabrication.

Specialized Testing for Spring Wire and Music Wire in Our Metal Wire Inspection Service

Tensile and proof strength for spring temper grades — the high tensile strength of music wire per ASTM A228 and oil-tempered wire per EN 10270-1 is verified to ensure the wire can withstand the coiling, stress relieving, and cyclic loading of engine valve springs, suspension springs, and industrial spring applications.
Torsion, coiling, and springback behaviour — the wire is coiled into a defined spring geometry on a laboratory coiler, then the free length, coil diameter, and load-deflection curve are measured to validate the consistency of the elastic modulus and the absence of surface defects that cause coiling fractures.
Fatigue life and endurance limit determination — rotating beam or alternating stress fatigue testing per ISO 1143 and customer-specific load spectra generates the S-N curve and the endurance limit, predicting the spring life under the operating stress range.
Non-metallic inclusion content and micro-cleanliness — per ISO 4967 and ASTM E45, the wire cross-section is examined microscopically to rate the size and distribution of silicate, alumina, and sulphide inclusions that act as fatigue crack initiation sites in high-cycle spring applications.

Electrical Conductivity and Resistivity Testing for Copper and Aluminum Wires

Electrical resistivity and conductivity by Kelvin bridge — per ASTM B193 and IEC 60468, the DC volume resistivity is measured at 20 °C on a precision four-point bridge to calculate the percent IACS conductivity, verifying that the copper or aluminium wire meets the minimum conductivity for electrical applications.
Resistance uniformity along the wire length — continuous resistance monitoring over the full coil length detects local variations in cross-section, composition, or temper that would cause hot spots in transformer and motor windings.
Thermal endurance and resistivity stability — the wire is aged at elevated temperature per ASTM B263 and IEC 60172, and the change in resistivity and tensile properties is recorded to predict the thermal class of magnet wire enamel and the long-term stability of overhead conductors.

Report Recognition and ISO/IEC 17025 Compliance

All test methods described in this metal wire inspection service are covered by our ISO/IEC 17025 scope of accreditation. Our test reports are accepted by European notified bodies for CE marking, by North American procurement specifications referencing ASTM and AWS standards, and by customs and engineering authorities across the Middle East, Australia, and Asia. Whether you require a complete qualification of a new wire supplier, a batch release inspection for an incoming coil shipment, or a root cause failure analysis of a fractured wire, our laboratory delivers the measurement accuracy and documentation integrity that global wire-consuming industries demand.