Inspection of Billets Entering the Complex for the First Time
For billets entering the complex for the first time, following notification by the relevant authorities, the batch is arranged separately by the furnace unit. These shipments are typically trial batches with limited quantities. Inspection of these billets is carried out by laboratory experts and includes:
Dimensional inspection (length, rhombus deviation, cross-sectional dimensions, straightness over one meter and total billet length, cutting deviation)
Visual and surface defect inspection
Removal of a surface layer using air cutting to examine the billet for internal soundness, absence of cracks, and gas porosity
Measurement of oxide layer thickness
Sampling for chemical composition analysis
Once the billet manufacturer’s initial shipments are approved by the complex’s quality control unit in terms of dimensions, appearance, chemical analysis, and mechanical properties, the inspection process for subsequent shipments is generally continued in the form of chemical analysis testing as outlined below.
Sampling for Chemical Analysis
For alloy and industrial billets: one sample per heat number
For construction-grade billets: one sample per every 500 tons of incoming material

Sampling frequency during production depends on the type of final product, first-time billet usage, and the product’s conformity with applicable standards.
Under normal conditions, for construction-grade products, three samples per shift are taken. If the product does not comply with the standard, the adjustment process along with sampling and testing continues until the required properties are achieved.

At the final stage, after quality control experts have confirmed the quality of the produced product, its dimensions, and the appropriateness of packaging, the final product is approved, and the quality label is printed and issued.