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Fe 500 vs Fe 500D vs Fe 550D — what IS 1786 requires
| Grade | Min yield strength | Min tensile strength | Min elongation | Typically used for |
|---|---|---|---|---|
| Fe 500 | 500 N/mm² | 545 N/mm² | 12% | General residential and commercial RCC work |
| Fe 500D | 500 N/mm² | 565 N/mm² | 16% | Same strength, more ductility — the common choice for seismic zones |
| Fe 550 | 550 N/mm² | 585 N/mm² | 10% | Higher strength where the design calls for it |
| Fe 550D | 550 N/mm² | 600 N/mm² | 14.5% | High strength with ductility — heavier structures |
The "D" stands for ductility — a D-grade bar bends further before it fails, which matters in a seismic zone. Figures are the minimums laid down in IS 1786; actual values on any batch appear on its mill test certificate, which we supply on request. Unsure which grade your drawing specifies? Send it over and we'll confirm before you order.
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