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IS 735:1975 is the Indian Standard (BIS) for wrought aluminium and aluminium alloy bar, rod and section for general engineering purposes - specification. This standard specifies the requirements for wrought aluminium and aluminium alloy bars, rods, and sections intended for general engineering purposes. It establishes guidelines for chemical composition, mechanical properties, and dimensional tolerances to ensure consistency in manufacturing and procurement.
Covers the requirements for wrought aluminium and aluminium alloy bars, rods, and sections for general engineering applications.
Overview
Status
Current
Usage level
Specialized
Domain
Materials Science — Aluminium and Non-Ferrous Metals
! Ensure the correct alloy designation and temper condition (e.g., O for annealed, M for as-manufactured) are explicitly specified during procurement, as mechanical properties vary significantly based on temper.
! Always verify dimensional tolerances and straightness specifications for structural sections to avoid downstream assembly and machining issues.
Standard Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes
Directly covers extruded bars, rods, and profiles (sections) for similar engineering applications.
EN 755-2:2016CEN (European Committee for Standardization)
HighCurrent
Aluminium and aluminium alloys - Extruded rod/bar, tube and profiles - Part 2: Mechanical properties
Specifically defines mechanical properties for the same product forms covered in IS 735.
ISO 6362-2:2014ISO (International Organization for Standardization)
HighCurrent
Wrought aluminium and aluminium alloys — Extruded rods/bars, tubes and profiles — Part 2: Mechanical properties
Specifies mechanical properties for extruded aluminium alloy bars, rods, and sections globally.
JIS H 4040:2020JSA (Japanese Standards Association)
MediumCurrent
Aluminium and aluminium alloy rods, bars and wires
Covers rods and bars, but its grouping with wires differs slightly from IS 735's focus on sections.
Key Differences
≠IS 735:1975 uses an outdated 5-digit Indian designation system for alloys (e.g., 65032), whereas modern international standards use the 4-digit Aluminum Association (AA) numerical system (e.g., 6061, 6351).
≠IS 735 is a single, concise document. Equivalent EN and ISO standards are multi-part, separating general requirements, mechanical properties, and dimensional tolerances for different shapes into distinct documents, allowing for greater detail.
≠International standards like ASTM B221 and EN 755 cover a significantly wider range of alloys and more specific temper designations (e.g., T651, T7451) developed since 1975.
≠Dimensional tolerances specified in IS 735 are generally looser than those in current international standards like the EN 755 series, reflecting advancements in manufacturing precision.
Key Similarities
≈All standards cover the same fundamental product forms: round material (rod), and material with rectangular, square, hexagonal or other polygonal cross-sections (bar and section/profile).
≈The primary mechanical properties used for material acceptance are consistent across all standards: Tensile Strength, Proof Stress (Yield Strength), and Elongation.
≈The concept of using temper designations (e.g., 'O' for annealed, 'T6' for solution heat-treated and artificially aged) to define the material's metallurgical condition and properties is a common principle.
≈All standards mandate general quality requirements, including freedom from injurious defects, and require material to be marked for traceability of alloy, temper, and manufacturer.
Parameter Comparison
Parameter
IS Value
International
Source
Alloy Designation (Equivalent)
65032
6351
ASTM B221 / EN 573-3
Min. Tensile Strength (Alloy 6351-T6 equiv., ≤12.7mm)
310 MPa (for 65032WP)
310 MPa (for 6351-T6)
ASTM B221
Min. 0.2% Proof Stress (Alloy 6351-T6 equiv., ≤12.7mm)
260 MPa (for 65032WP)
270 MPa (for 6351-T6)
ASTM B221
Min. Elongation (Alloy 6351-T6 equiv., ≤12.7mm)
8% (on gauge length 5.65√S₀)
7% (on 50mm gauge length)
ASTM B221
Chemical Composition - Silicon (Si) %
0.7 - 1.3% (for 65032)
0.7 - 1.3% (for EN AW-6351)
EN 573-3
Chemical Composition - Magnesium (Mg) %
0.6 - 1.2% (for 65032)
0.4 - 0.8% (for EN AW-6351)
EN 573-3
Diameter Tolerance for Extruded Rod (25mm dia.)
±0.40 mm
±0.28 mm
EN 755-3
⚠ Verify details from original standards before use
What mandatory tests are required by this standard?+
Chemical composition analysis and tensile testing (to determine ultimate tensile strength, 0.2% proof stress, and elongation) are mandatory.
How is proof stress measured for these alloys?+
It is measured at a 0.2% non-proportional elongation (offset) during the tensile test.
Does this standard apply to architectural aluminium sections?+
While it covers sections for general engineering, specific architectural profiles and extruded shapes often follow specialized standards with tighter finish and dimensional requirements, such as IS 1285.