During the receipt of our raw materials, we carry out all the necessary checks to ensure that they meet our quality requirements.
Using our wide range of measuring equipment (all calibrated by accredited laboratories), such as calipers, micrometers, goniometers, squares, etc., we check 100% of the products received, verifying that they comply with the applicable reference standards, EN 10034, EN 10051, EN 10055, EN 10143, EN 10163, EN 10219, etc.
During reception, 100% of the steel batches undergo mechanical tensile testing according to ISO 6892 guidelines, as well as chemical testing. For this purpose, we have a powerful tensile testing machine and a mass spectrometer to verify compliance with standards such as EN 10025, EN 10327, and EN 10111, and to assess the steel’s suitability for galvanizing.
Once the initial screening is complete, the raw materials enter the production process, where our self-monitoring system, combined with our final inspections, ensures the quality of the semi-finished or finished product.
To carry out these inspections, we utilize a wide variety of control and measurement equipment distributed throughout each and every manufacturing station, and our staff possesses extensive experience in these control processes.
Industrias Duero has qualified personnel for a wide range of Welding Procedure Qualifications (WPQR), both manual and robotic, following the guidelines of the reference standard EN 15614-1. All welders are qualified according to the EN 287-1 standard.
Non-Destructive Testing (NDT) for welding and metallic materials is performed by Level 2 qualified personnel in the various NDT methods, following the guidelines of the ISO 9712 standard.
Our products can be finished with hot-dip galvanizing and/or painting. Our controls and inspectors at the galvanizing plants guarantee a perfect finish, complying with the most demanding galvanizing standards, such as UNE EN 1461, or according to BSI or AASHTO standards.
For painted finishes, we can meet any level of product requirement, primarily working in accordance with ISO 12944 (UNE-EN ISO 12944), which is specific for the anti-corrosion protection of steel and coated metal surfaces. The painting method uses powder or acrylic paints, depending on the size of the structure.
