IS 1852:1985 is the Indian Standard (BIS) for rolling and cutting tolerances for hot rolled steel products. This standard prescribes the rolling and cutting tolerances for hot-rolled steel sections, including beams, channels, angles, plates, and bars. It defines the permissible variations in weight, dimensions, and straightness to ensure structural integrity and fit-up accuracy during fabrication.
Specifies rolling and cutting tolerances for various hot rolled steel products like plates, sheets, sections, and bars.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Thickness Tolerance (10mm thick x 2000mm wide plate) | ±0.50 mm (symmetrical) | -0.3 mm / +1.2 mm (asymmetrical) | EN 10029:2010 (Class A) |
| Straightness/Camber (Beams & Sections) | 0.2% of the total length | 1/8 in. x (length in ft / 5) [which calculates to ~0.21% of total length] | ASTM A6 / A6M - 23 |
| Length Tolerance (Plate, cut length approx. 5m) | +50 mm / -0 mm | +25 mm / -0 mm | EN 10029:2010 (Normal Tolerance) |
| Out-of-Squareness (Plate) | Max deviation of 1.0% of the actual width | Max deviation of 1.0% of the actual width | EN 10029:2010 |
| Flatness Tolerance (Plate, Normal, <25mm thick) | 12 mm over a 2000 mm gauge length | 11 mm over a 2000 mm gauge length (for steel group L) | EN 10029:2010 (Class N) |
| Width Tolerance (Plate, >1500 to 2500 mm wide) | +20 mm / -0 mm | +13 mm / -0 mm (for universal mill plates) | ASTM A6 / A6M - 23 |