What is ISO 630‑3 about?
ISO 630-3 is the third part in the multi-series of International Standards on ‘Steels for structural purposes’. ISO 630‑3 specifies requirements for flat and long products of hot-rolled weldable fine-grain structural steels in the as-rolled (for SG grades only), normalized/normalized rolled and thermomechanical processed delivery conditions. ISO 630-3 applies to steel plates rolled on a reversing mill, wide flats, hot-rolled sections and bars, which are intended for use in heavily loaded parts of welded or bolted structures.
ISO 630‑3 covers 13 grades and 6 qualities.
The steels specified in ISO 630‑3 apply to hot-rolled plates, wide flats, sections and bars with a minimum nominal thickness of 3 mm and a maximum nominal thickness of 250 mm.
Who is ISO 630‑3 for?
ISO 630‑3 on fine-grain structural steels is relevant to:
- Steel manufacturers
- Structural and mechanical engineers
- Construction industry
- Automotive industry
- Welders
- Fabricators
Why should you use 630‑3?
Fine-grain structural steel, as the names suggests, is steel that has fine grain structure due to low carbon content and alloying elements. The finer the grain size, the higher is the yield strength.
ISO 630‑3 provides information on classification and designation of grades and qualities of the steel, steelmaking process, delivery condition, chemical composition, mechanical properties and the surface condition required to manufacture and produce products from fine-grain structural steel.
Compliance to ISO 630-3 will equip you with best practice guidance on ensuring greater formability and workability of fine-grain structural steel and make the right choice for your specific engineering needs. Incorporating a standardised process will also aid in improved product development and stringent quality control measures.
What’s changed since the last update?
ISO 630‑3 cancels and replaces the first edition (ISO 630‑3:2012), which has been technically revised. The main changes compared to the previous edition are as follows:
- Grades S390N, S390M, S500M, pertaining requirements, applicable thickness ranges have been added
- Additional terms and definitions concerning heat treatments have been deleted because ISO 4885 is in normative references of ISO 630‑1
- Quality E has been renamed L (impact testing at -50 °C) to keep quality E for impact testing at -40 °C in all parts
- Quality E (impact testing at -40 °C) has been added and quality F (impact testing at -60 °C) has been added to S355N and S355M
- The formula for CEV has been deleted because given in ISO 630‑1 and test units have been updated
- Order of listing chemical elements has been updated for grades of Annex A by ISO 6306
- The content of the document has been updated to harmonize with all parts of ISO 630
