According with the standard: EN 10305-2/1

Steel grade: E355

Delivery condition: +SR

ID tolerance H8

Mechanical properties: Rm>580 N/mm1; Rs> 520N/mm2;  Ap5>15%

Ra= max 0.25my, RI max 1.6 my

Tests: visual, dimensional, mechanical tests and chemical analysis, ultrasound check 100%;