ISO Certified Laboratory for Steel Quality Testing | Winture

The OES spectrometer is the primary tool for verifying that incoming steel matches its declared grade. A small surface sample is excited by electrical spark, and the emitted spectrum identifies the concentration of every alloying element simultaneously: carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), chromium (Cr), nickel (Ni)molybdenum (Mo), and others.

Why this matters:

A coil labelled Q355B with carbon content outside specification will not achieve 355 MPa yield strength under production conditions. An angle steel batch with elevated sulfur causes brittle fracture risk at low temperature. OES analysis catches both problems before the material enters our production line — not after a structural failure on a project site.

Test output:

Full elemental composition report, comparison against grade specification limits, pass/fail status. Provided to customer as part of IQC documentation.

The universal testing machine applies controlled tensile load to a standardized coupon cut from the actual production batch. It measures and records the full stress-strain curve, from which yield strength, tensile strength, and elongation at fracture are calculated.

Parameters measured:

Yield strength (ReH or Rp0.2, MPa)

Tensile strength (Rm, MPa)

Elongation at fracture (A%, per ISO 6892-1 / ASTM E8M)

Why this matters: 

A solar pile that doesn't meet Q355B yield strength will deform under wind load before the design load is reached. A tower leg member that doesn't achieve ASTM A572 Gr.50 tensile strength creates an undefined safety margin in the structural analysis. Mechanical testing is the direct confirmation that the material will perform as designed.

Test output: 

Stress-strain curve, measured Rp0.2 / Rm / A% values, comparison against specification, pass/fail. Provided with IQC documentation.

The Charpy impact test measures the energy absorbed when a standardized notched specimen fractures under a sudden blow 
— quantifying the material's resistance to brittle fracture at low temperatures.

When this test is required:

Transmission towers in high-altitude, high-latitude, or cold-climate installations (design temperature ≤−20°C) 

Structural steel specified to grades requiring impact guarantees: 

Q355B subgrades D and E, EN 10025 S355J2, ASTM A572 Gr.50 with CVN requirement

Oil and gas structures where brittle fracture is a safety-critical failure mode

Test output: 

Absorbed energy (Joules) at specified test temperature, comparison against specification minimum, pass/fail.
 

Electromagnetic coating thickness measurement is performed across all surfaces of galvanized structural members after the HDG process. Measurements are taken at a minimum of 5 points per member face per ISO 1461 protocol, covering areas identified as most susceptible to thin coating: sharp corners, complex geometry, and inside faces of angles.

Standards applied: 

ISO 1461, EN ISO 1461, ASTM A123 / A153

Acceptance criteria:

Solar mounting structures: ≥55μm local minimum, ≥85μm average

Transmission tower members: ≥70μm local minimum, ≥90μm average

Enhanced specification (coastal C5-M): ≥100μm average, agreed per project

Test output: 

Tabulated measurement results by surface location, average and minimum values, pass/fail. Provided as part of FQC documentation.
 

The salt spray chamber subjects coated specimens to a continuous 5% NaCl mist at 35°C — a standardized accelerated corrosion environment (ISO 9227 / ASTM B117). It is used to validate that coating systems perform as specified under the simulated service conditions corresponding to each corrosion class.

Test protocols used:

What the test validates: 

Time to first visible red rust on HDG coating; time to first red rust at cut edges on Zn-Al-Mg-coated samples; coating adhesion retention after extended exposure. Results form the empirical basis for Winture's 25–30-year coating warranty commitments.    

Test output: 

Time-stamped photographic record at each inspection interval, rust area percentage, final pass/fail. Retained internally; provided to customers requiring extended corrosion validation.