The 1991 edition of IS 1252 delineates the standard nominal sizes, weights, and cross-sectional characteristics of hot rolled steel bulb angles predominantly utilized in shipbuilding and automobile manufacturing sectors. This code establishes uniform designations, permissible dimensional deviations, and comprehensive sectional data to guarantee consistency and quality in structural engineering applications. It serves as a crucial reference for designers, fabricators, and quality personnel engaged with bulb angle components.
Overview
The 1991 edition of IS 1252 delineates the standard nominal sizes, weights, and cross-sectional characteristics of hot rolled steel bulb angles predominantly utilized in shipbuilding and automobile manufacturing sectors. This code establishes uniform designations, permissible dimensional deviations, and comprehensive sectional data to guarantee consistency and quality in structural engineering applications. It serves as a crucial reference for designers, fabricators, and quality personnel engaged with bulb angle components.
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Structure
Frequently Asked
IS 1252:1991 defines the nominal sizes, weights, and sectional properties of hot rolled steel bulb angles primarily used in shipbuilding and automotive industries. The standard provides detailed dimensional data including leg lengths, thicknesses, bulb radii, and mass per unit length, as listed in Table 1. These specifications ensure interchangeability and precise structural calculations, with typical leg sizes ranging from 50 mm to 100 mm and thicknesses varying between 5 mm and 16 mm.
The designation methodology in IS 1252 assigns bulb angles based on their nominal dimensions and mass as per Table 1. The naming convention includes the prefix 'BA' followed by the depth of the longer leg in millimeters, for example, BA 100 denotes a bulb angle with a 100 mm longer leg depth. This system facilitates clear communication for ordering and usage. Tolerances for dimensions and mass adhere to IS 1852:1985, with rounding following IS 2:1960 guidelines.
IS 1252 references IS 1852:1985 for rolling and cutting tolerances applicable to hot rolled steel bulb angles. These tolerances cover variations in thickness, width, length, straightness, and edge finish. Typical permissible deviations include ±0.5 mm for thickness, ±1.5 mm for width and height, and ±5 mm for length, subject to specific product dimensions. Compliance with these tolerances is essential to ensure quality and dimensional accuracy.
IS 1252 supplies comprehensive sectional characteristics for bulb angles in Table 1, including sectional area (cm²), mass per meter (kg/m), moments of inertia about principal axes (Ixx, Iyy, Iuu, Ivy in cm⁴), radii of gyration (rx, ry, ru, rv in cm), section moduli (Zx, Zy in cm³), centroid locations relative to flange and web back lines, and distances to extreme fibers. These parameters assist structural engineers in precise calculations and design.
Heavier bulb angle variants in IS 1252 are differentiated by appending one or two asterisks to the standard designation, such as BA 75*, BA 75**. These indicate progressively heavier sections with increased flange widths due to roll spreading. Exact dimensions and masses for these variants are provided in Table 1, and it is crucial to specify the mass explicitly when ordering to ensure correct material supply.
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