This specification defines the criteria for hot-rolled steel profiles utilized in the construction of doors, windows, ventilators, and sashes. It details material standards, dimensional and mass tolerances, surface finish requirements, and testing protocols such as bending tests, ensuring these sections meet durability and construction suitability. The standard is crucial for engineers, fabricators, and manufacturers working with steel fenestration components.
Overview
This specification defines the criteria for hot-rolled steel profiles utilized in the construction of doors, windows, ventilators, and sashes. It details material standards, dimensional and mass tolerances, surface finish requirements, and testing protocols such as bending tests, ensuring these sections meet durability and construction suitability. The standard is crucial for engineers, fabricators, and manufacturers working with steel fenestration components.
Audience
Contents
Structure
This section outlines the applicability of hot-rolled steel sections with specified dimensions and mass per unit length, including the allowed dimensional deviations depending on size ranges. It includes examples of tolerances for different measurement categories and explains the rounding conventions for mass and test results as per IS 2:1960.
IS 7452 integrates references to multiple Indian Standards crucial for compliance, such as IS 1599 for bend testing, IS 2830 and IS 2831 for carbon steel billets, and IS 6914 concerning concast billets. Marking and rounding off requirements are also detailed within this section.
Defines key terminologies including overall dimensions of doors and windows, types of bars (sub-dividing, sash, mullions, transoms), and presents designation codes for steel sections with their typical uses in fenestration assemblies.
Describes the classification and letter-based identification of hot-rolled steel profiles, providing mass per unit length for different section types and explaining dimensional parameters including flange and web thicknesses and radii.
Details mass values for various profiles and provides the formula for calculating mass based on cross-sectional area and steel density, emphasizing its importance for material estimation and design.
Specifies measurement procedures, including multiple points averaging and precision recording, and tabulates permissible tolerances for different dimension ranges to ensure consistency in production.
Defines the nominal mass per meter for various profiles with an allowable deviation of ±5%, providing examples and calculation formulas for mass tolerance important for quality assurance.
Discusses the indirect control of surface finish through strict adherence to dimensional and mass tolerances and summarizes mass tolerance and dimensional precision requirements to maintain product quality.
Outlines the bend test frequency and method, rules for selecting and preparing test samples including heat treatment restrictions, and specifies rounding rules for test result reporting as per IS 2:1960.
Details the requirements for indelible marking at intervals not exceeding 1 meter, the information to be included on metal tags attached to bundled sections, and packaging practices to prevent damage and ensure traceability.
Frequently Asked
The approved types of steel billets for manufacturing hot-rolled sections under this standard include carbon steel billets, blooms, and slabs complying with IS 2830:1975 (standard and ordinary quality), billets as per IS 2831:1975, and concast billets conforming to IS 6914:1978. These billets must meet dimensional accuracy and be free from defects to ensure suitability for fabrication processes such as punching and welding.
According to IS 7452, the nominal thickness of steel sections is allowed a tolerance of ±0.2 mm, while the radii of curvature have a permitted variation of ±0.5 mm. Other dimensions have tolerances depending on their nominal size, specifically ±0.2 mm for dimensions up to 10 mm, ±0.4 mm for those over 10 mm and up to 25 mm, and ±0.6 mm for dimensions exceeding 25 mm, ensuring precision in rolling and forming.
The bend test must be conducted on at least one sample per cast or continuous production batch, plus one test per product classification and thickness variation. The test involves cold bending the specimen without fracturing it, ensuring the internal bend radius does not exceed three times the thickness of the sample, with the bent sections remaining parallel. If the first test fails, two additional samples must be tested, both of which must pass for acceptance; otherwise, the material is rejected.
IS 7452 identifies several hot-rolled steel section profiles by letter codes such as F4B, F7D, and others illustrated in Figure 2 of the standard. These profiles are standardized for use in doors, windows, ventilators, and sashes, with specified mass per meter values (e.g., F4B at 2.28 kg/m, F7D at 1.419 kg/m) and constructed from steel conforming to IS 2830, IS 2831, or IS 6914.
Steel sections must be bundled for supply, with each bundle clearly tagged using a durable metal label indicating the manufacturer, section designation (such as channel or angle), quantity of pieces, and batch number. The sections must be free from surface defects, properly straightened with twist not exceeding 5 degrees over 3 meters, and packaged securely to prevent damage during transportation, ensuring traceability and quality compliance.
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