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IS 733:1983 is the Indian Standard (BIS) for wrought aluminium and aluminium alloy plate, sheet and strip for general engineering purposes - specification. This standard specifies the chemical composition, mechanical properties, and dimensional tolerances for wrought aluminium and aluminium alloy bars, rods, and sections used in general engineering. Engineers use it to procure, specify, and test aluminium extrusions and solid sections to ensure adequate strength, purity, and appropriate temper conditions.
Covers the requirements for wrought aluminium and aluminium alloy plate, sheet, and strip used for general engineering purposes.
Overview
Status
Current
Usage level
Frequently Used
Domain
Materials Science — Aluminium and Non-Ferrous Metals
! Always specify both the alloy designation (e.g., 64430) and the required temper condition (e.g., WP or O) during procurement, as the mechanical properties vary drastically based on heat treatment.
! Yield stress in aluminium alloys is usually measured as 0.2 percent proof stress because aluminium generally lacks a distinctly marked yield point.
! For aluminium sheets and strips, refer to IS 737 instead of IS 733.
Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate
Specifies requirements for wrought aluminum and aluminum-alloy sheet and plate for general applications.
EN 485-2:2016+A1:2018CEN (European Committee for Standardization)
HighCurrent
Aluminium and aluminium alloys - Sheet, strip and plate - Part 2: Mechanical properties
Specifies the mechanical properties for wrought aluminium and aluminium alloy sheet, strip and plate for general engineering use.
ISO 6361-2:2022ISO (International Organization for Standardization)
HighCurrent
Wrought aluminium and aluminium alloys — Sheets, strips and plates — Part 2: Mechanical properties
A global standard defining the mechanical properties of wrought aluminium and alloy sheet, strip, and plate.
BS 1470:1987BSI (UK)
HighWithdrawn
Specification for wrought aluminium and aluminium alloys for general engineering purposes - plate, sheet and strip
The historical British standard from which IS 733:1983 derived much of its alloy designation system and content.
Key Differences
≠The alloy designation system in IS 733 uses a five-digit numerical system (e.g., 19000, 65032) based on an old British standard, whereas modern international standards use the four-digit system from The Aluminum Association (e.g., 1100, 6061).
≠IS 733:1983 is significantly outdated, with its last revision in 1983. International standards like ASTM B209 and EN 485 are revised frequently to include new alloys, refined properties, and updated testing methodologies.
≠The temper designation system in IS 733 is a simplified version (e.g., H2, H4, WP for T6). International standards use a more detailed and comprehensive system (e.g., H12, H14, T6, T651) that provides more precise control over the material condition.
≠IS 733 covers a limited selection of about a dozen alloys common in 1983, while current international standards like ASTM B209 list a much more extensive range of alloys available commercially today.
Key Similarities
≈All standards cover the same primary product forms—plate, sheet, and strip—and generally define them by thickness ranges. For instance, 'plate' is consistently defined as a flat product with a thickness over 6 mm.
≈The core mechanical properties specified for quality control are identical: Ultimate Tensile Strength (UTS), 0.2% Proof Stress (Yield Strength), and Percent Elongation.
≈The fundamental metallurgical concepts of tempers are the same. 'O' temper signifies the softest, annealed condition, and 'T6' signifies a solution heat-treated and artificially aged condition across all standards.
≈The basic chemical composition ranges for equivalent alloys are very closely aligned. For example, the specified percentages of silicon, magnesium, and copper in IS 65032 are nearly identical to those in AA 6061.
Parameter Comparison
Parameter
IS Value
International
Source
Alloy Designation Equivalent
65032
6061
ASTM B209
Chemical Composition (Silicon, Alloy 65032/6061)
0.40 - 0.8%
0.40 - 0.8%
ASTM B209
Chemical Composition (Magnesium, Alloy 65032/6061)
0.8 - 1.2%
0.8 - 1.2%
ASTM B209
Min. Tensile Strength (Alloy 65032-WP / 6061-T6, <6.3mm thick)
295 MPa
290 MPa (42 ksi)
ASTM B209
Min. 0.2% Proof Stress (Alloy 65032-WP / 6061-T6, <6.3mm thick)
255 MPa
240 MPa (35 ksi)
ASTM B209
Min. Elongation % (Alloy 65032-WP / 6061-T6, ~3mm thick)