From the most standard to the most sophisticated
As soon as a grade of steel is produced, it undergoes numerous checks and inspections to guarantee its conformity with specifications (cleanness, machineability, geometry, ...)
 
Surface quality inspections (eddy currents, magnetic dispersion leakage flux, magnetic particle inspection, ...)
Internal quality inspections (ultrasounds, ultrasonic inspection at 100% of volume, ...)
Dimensional and anti-mixing inspections
Internal cleanness inspections (ultrasound inspection in tank, wide field image analyses, ...)
Conventional laboratory tests (analyses, mechanical tests, metallographic examinations)