What is ISO 630 ‑ 4 about?
ISO 630-4 is the fourth part in the multi-series of International Standards on ‘Steels for structural purposes’. ISO 630 ‑ 4 specifies qualities for high-yield-strength quenched and tempered structural steels. ISO 630 ‑ 4 applies to steel plates and wide flats rolled on a reversing mill which is used in the quenched and tempered condition and normally intended for welded or bolted structures.
ISO 630