The standard details allowable tolerances for rolling and cutting hot rolled steel products tailored for structural and general engineering uses. It outlines precise dimensional and weight deviation limits for various steel profiles such as beams, columns, angles, bars, sheets, and strips. This code is crucial for manufacturers, fabricators, and inspection personnel to maintain uniform quality and dimensional accuracy in steel components.
Overview
The standard details allowable tolerances for rolling and cutting hot rolled steel products tailored for structural and general engineering uses. It outlines precise dimensional and weight deviation limits for various steel profiles such as beams, columns, angles, bars, sheets, and strips. This code is crucial for manufacturers, fabricators, and inspection personnel to maintain uniform quality and dimensional accuracy in steel components.
Audience
Contents
Structure
This section defines the range of hot rolled steel products covered, including beams, columns, channels, and angles. It references rolling and cutting tolerances detailed in the appendix and applies to typical structural steel grades. Key dimensional limits such as flange width, off-centre web positioning, and camber/sweep tolerances are tabulated with specific numerical values for various size ranges.
Clarifies essential terms related to hot rolled steel sections, such as off-centre web limits corresponding to section depth, flange width tolerances, and permissible flange out-of-square or out-of-parallel deviations. Tables provide maximum allowable values and reference figures are indicated to illustrate concepts.
Details the formula for calculating nominal weight using steel density (7.85 g/cm³) multiplied by product volume. Includes weight tolerance percentages for different thickness ranges of sheets and rolling tolerance limits for structural steel sections, ensuring accurate estimation and compliance.
Specifies weight tolerances per metre for various steel types, including ±2.5% for ordinary structural steel and ±4% for Fe 310-0 grade. Also covers consignment weight tolerances and dimensional deviation limits applicable to beams, channels, angles, tees, bars, flats, plates, strips, and sheets, supported by formulas and summarized tables.
Lists tolerance values for beam depth, flange width, and web off-centre positioning categorized by dimension ranges. These tolerances ensure correct fit and structural integrity during fabrication and erection phases.
Covers leg length tolerances for equal and unequal leg angles with specific values based on leg size, as well as angular tolerances requiring legs to be perpendicular within ±1°. Includes special provisions for longer legs of unequal angles.
Defines permissible deviations for flange parallelism and squareness including a 1 in 60 tolerance for flange parallelism and maximum allowable flange out-of-square values correlated with flange width. Also addresses angular tolerances for angles and negotiable limits for parallelogram sections.
Describes plus and minus tolerance ranges for the longer leg length (depth) of bulb angles and requires legs to be perpendicular within ±1°. Highlights the structural significance of bulb angles and their dimensional control.
Specifies size tolerances based on bar diameter or side length for both straight and coiled bars, excluding heavy ends. Weight tolerances for straight bars are given as percentages per size range, while coiled bars have out-of-shape limits but no weight tolerance.
Details weight tolerance percentages for flats based on thickness, width tolerances for flats, and thickness tolerance tables for sheets, indicating allowable deviations to maintain production quality.
Summarizes thickness tolerances for sheets and strips within specific thickness ranges in millimeters and percentages, ensuring dimensional consistency across product batches.
Lists width tolerances for trimmed and as-rolled strip edges across various width categories, along with thickness tolerance allowances for strips up to 500 mm wide, describing measurement standards.
Specifies tolerances on theoretical weights for bundles and consignments based on weight thresholds, as well as thickness-based tolerances for individual sheets, ensuring shipment conformity and quality control.
Outlines rounding-off rules adhering to IS:2-1960 and details size and weight tolerance measurement standards for bars and strip widths, ensuring uniformity in quality checks and reporting.
Frequently Asked
Per IS 1852 (Clause 4.1.2), flange width tolerances are ±2.0 mm for widths up to 100 mm, ±2.5 mm for widths between 100 and 125 mm, and ±4.0 mm for widths from 125 to 250 mm. Weight tolerances specified include ±2.5% of the designated weight per meter for general structural steel and ±4% for Fe 310-0 grade steel. These limits ensure precise dimensions and consistent weight for structural steel beams and columns.
IS 1852 primarily controls thickness through weight tolerances rather than direct thickness limits. For strips and flats up to 3 mm thickness, a ±5% weight tolerance applies, and for thicknesses above 3 mm, a ±3% weight tolerance is specified. Thickness consistency is indirectly maintained via these weight controls and supplemented by dimensional standards in related IS codes such as IS 1731 and IS 1730.
The standard sets the following weight tolerances for bars in straight lengths: ±7% for diameters up to 10 mm, ±5% for 10 to 16 mm, and ±3% for sizes above 16 mm. Size tolerances vary from ±0.5 mm for bars up to 25 mm to ±1.3 mm for bars between 80 and 100 mm. Coiled bars have specific shape tolerances but no specified weight tolerance.
Angles and bulb angles must have legs perpendicular to each other within ±1.0° as mandated by IS 1852 (Clauses 4.3.2 and 4.5.3). Parallelogram sections’ out-of-square tolerance is subject to mutual agreement between purchaser and supplier. Flanges of sections must also maintain parallelism within a 1 in 60 deviation, approximately ±1°.
Yes, for unequal leg angles such as 45 x 30 mm, IS 1852 includes a special tolerance allowing the longer leg a +2.0 / -1.5 mm deviation. This provision is valid only for three years from the standard’s publication date, after which it is to be withdrawn. The shorter leg follows the general tolerance table. Legs must also maintain perpendicularity within ±1°.
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