Tubi in acciaio h9

According with the standard: EN 10305-2; Steel grade: E355; Delivery condition: +C; ID tolerance range: according with ISO H; Roughness on the ID: Ra < 0.8 µm Mechanical properties: Rm > 640 N/mm2 ; Rs > 512 N/mm2; Ap5 > 4%; Tests: visual, dimensional, mechanical test and chemical analysis, ultrasound check 100%.

Tubi in acciaio h8

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%;