IS 2062 designates structural steel by minimum yield strength — E165, E250, E350, E410, E450 (N/mm²) — and by quality grade (BR, A, B, C, D) which sets weldability and notch-toughness (impact) requirements. E250 is the general workhorse; higher E-grades save weight; the quality suffix (not the E-number) is what governs whether the steel is suitable for welded or low-temperature service.
•Quality grade governs weldability and Charpy impact requirement — not the yield number alone
•Standard/E250 is the general structural workhorse; higher E-grades for weight-efficient design
•Specify BOTH the yield grade and the quality grade (e.g. 'E250 BR' or 'E350 C') — never just 'IS 2062 steel'
•Design to IS 800 using the specified minimum yield; the quality grade must suit welding/temperature
Reference Tables
IS 2062 designation (indicative — verify current edition)
Element
Meaning
E165 / E250 / E350 / E410 / E450
Minimum yield strength (N/mm²)
Quality BR
Basic — general, limited weldability/impact assurance
Quality A/B/C/D
Progressively tighter weldability & Charpy impact (D = best toughness)
Indicative — confirm grade values, quality definitions and impact requirements against the current BIS edition.
Practical Notes
✓The quality suffix is the safety-critical part: 'E250' alone doesn't say whether it is weldable or notch-tough — specify the quality grade for welded/cold-service structures.
✓Higher E-grades save steel weight but lengthen connections/welds and demand attention to ductility — design holistically.
Common Mistakes
⚠Specifying only the E-number, omitting the quality grade (weldability/impact unspecified).
⚠Using a basic quality where welded/low-temperature service needs a C/D impact grade.