According to data supplied by specialists at Severstal', up to 90% of all defects originate during the production of the
steel. Thus, the next step in the development of UST at Severstal' was to expand testing in order to include earlier conversions.The key here is to expand the testing, rather than shift it to a point farther up the production line - since only testing of the finishedproduct can guarantee quality. Testing of semifinished products can reduce production costs.