GB/T 16475-2008 English PDF (GBT16475-2008)

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GB/T 16475-2008: Temper designation system for wrought aluminium and aluminium alloy
GB/T 16475-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.150.10
H 60
Replacing GB/T 16475-1996
Temper designation system for
Wrought aluminium and alloy
(ISO 2107.2007, Aluminium and aluminium alloys –
Wrought products - Temper designations, MOD)
ISSUED ON. JUNE 17, 2008
IMPLEMENTED ON. DECEMBER 1, 2008
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Application Scope ... 5 
2 General ... 5 
3 Basic temper designations ... 5 
4 Subdivisions of O temper designations ... 6 
5 Subdivisions of H temper designations ... 6 
6 Subdivisions of T temper designations ... 9 
7 Subdivision of W temper designations ... 12 
8 Demonstration of response to heat treatment of T temper ... 12 
9 Cross-reference between the new and old temper designations ... 12 
Annex A (Informative) Demonstration of response to heat treatment ... 14 
Annex B (Informative) Cross-refence between the numbers of clauses or
subclauses of this Standard and those of ISO 2107.2007 ... 15 
Foreword
This Standard modifies and adopts ISO 2107.2007, Temper designation system for
wrought aluminium and alloy (English version), and is redrafted in accordance with
ISO 2107.2007. For the convenience of comparison, the cross-reference table
between the numbers of clauses or subclauses of this Standard and those of
corresponding national standards are given in the informative Annex B.
This Standard gives the modifications when adopting the international standards.
These technical differences are marked with vertical singlet lines in the page margins
of the clauses concerning them. The major differences are as follows.
-- some formats are modified in accordance with the Chinese linguistic habit;
-- some expressions applicable to international standards are changed into those
applicable to Chinese standards;
-- Clause 2 “Terms and definitions” of ISO 2107.2007 has been incorporated in GB/T
8005.1, Aluminium and aluminium alloys - Terms and definitions - Part 1. product
and method of processing and treatment, therefore this clause is not included in
this Standard;
-- the specification is added that H temper designations are only applicable to non-
heat-treatable alloy;
-- the specifications are added that W temper and O1 temper designations are
generally not the final delivery tempers of products;
-- the specification is added that T temper designations are only applicable to heat-
treatable alloy;
-- H32A temper used in China is added;
-- T81 temper and T87 temper are added;
-- the cross-reference between the new and old temper designations of China is
added.
This Standard replaces GB/T 16475-1996, Temper designation system for wrought
aluminium and aluminium alloy.
The major changes of this Standard compare with GB/T 16475-1996 are as follows.
-- this Standard gives modifications to the definitions of H temper, T temper, H112
temper and H116 temper;
-- this Standard deletes T0 temper;
-- this Standard adds tempers O1, O2, O3, H321, HXX4, HXX5, T79, T81, T87 and
Temper designation system for
wrought aluminium and alloy
1 Application Scope
This Standard specifies the temper designations of all product forms of wrought
aluminium and aluminium alloys.
This Standard applies to the products of wrought aluminium and aluminium alloy, which
are made by rolling, extrusion, drawing, forging, etc.
2 General
2.1 The temper designations include basic temper designations and subdivisions of
basic temper designations. Basic temper designations consist of one capitalized
English letter. The subdivisions of the basic tempers these are indicated by one or
more Arabic digits or capitalized English letters following the designation of the basic
temper. These Arabic digits or English capitalized letters relate to basic treatments or
special treatments which influence the product characteristics.
2.2 The “X” in the example temper designations of this Standard refers to any
unspecified Arabic digit, e.g. “H2X” may denote appropriate temper designations in the
series H21 ~ H29; “HXX4” may denote any temper designation in the series “H114 ~
H194”, or “H224 ~ H294”, or “H324 ~ H394”; “_” denotes any one or more Arabic digits,
e.g. “T_51” may denote any temper designation whose final two digits are “51”, such
as “T351, T651, T6151, T7351, T7651 etc.”
3 Basic temper designations
3.1 F - as fabricated
This designation applies to the products of shaping processes in which no special
control over thermal conditions or strain-hardening is applied. For this temper, there
are no mechanical property limits specified.
3.2 O - annealed
This designation applies to wrought products that are annealed to obtain the lowest
strength temper.
3.3 H - strain-hardened
This designation applies to products subjected to the application of work hardening, in
order to improve the strength.
3.4 W - solution heat-treated
This designation describes an unstable temper of natural ageing at room temperature
after solution heat-treatment. The temper is not a delivery condition of products, only
indicating the products are in the natural ageing period.
3.5 T - thermally treated to produce stable tempers other than F, O or H
This designation applies to products that are thermally treated, with or without
supplementary strain hardening, to produce stable tempers.
4 Subdivisions of O temper designations
4.1 O1 - high-temperature annealed and slow cooled
This designation applies to the temper in which products or samples are heated to
approximately the temperature for solution heat-treatment and maintained at the
temperature (the time is approximately the same as that specified for solution heat-
treatment), and cooled in the air outside the furnace, before ultrasonic inspection or
dimensional stability. Mechanical property limits are not specified. Therefore, it is
generally not the final delivery condition of products.
4.2 O2 - thermo-mechanically processed
This designation applies to wrought products which are annealed at high temperature
(up to the temperature specified for solution heat-treatment) to obtain good forming
properties, before the thermos-mechanical treatment.
4.3 O3 - homogenized
This designation applies to continuously cast drawing stock or strip which is subjected
to a high-temperature thermal treatment to eliminate or reduce segregation, thus
improving subsequent formability.
5 Subdivisions of H temper designations
5.1 First digit after H
5.1.1 The first digit following the letter H indicates the specific combination of basic
operations, denoted with digits 1 ~ 4.
5.1.2 H1X - Strain-hardened only. These designations apply to products that are
strain-hardened to obtain the desired strength without supplementary thermal
treatment.
6.2.6 T81 - applies to products that are cold-worked about 1% to improve strength
after solution heat-treatment, and artificially aged.
6.2.7 T87 - applies to products that are cold-worked about 7% after solution heat-
treatment, and artificially aged.
7 Subdivision of W temper designations
7.1 Subdivision of W temper designation, W_h
W_h - an unstable temper during specific natural ageing time at room temperature.
E.g. W2h indicates the natural ageing at room temperature is 2 h afte...