GB/T 33950-2017 PDF in English
GB/T 33950-2017 (GB/T33950-2017, GBT 33950-2017, GBT33950-2017)
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The continuous roll-casting strips of aluminium and aluminium alloy
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Standards related to (historical): GB/T 33950-2017
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GB/T 33950-2017: PDF in English (GBT 33950-2017) GB/T 33950-2017
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.150.10
H 61
The continuous roll-casting strips of
aluminium and aluminium alloy
ISSUED ON: JULY 12, 2017
IMPLEMENTED ON: FEBRUARY 01, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Requirements ... 7
5 Test methods ... 11
6 Inspection rules ... 13
7 Marking, packing, transporting, storing, and quality certificate ... 15
8 Order form (or contract) content ... 17
The continuous roll-casting strips of
aluminium and aluminium alloy
1 Scope
This Standard specifies the terms and definitions, requirements, test methods,
inspection rules, marking, packing, transporting, storing, quality certificate, and
order form (or contract) content of the continuous roll-casting strips of
aluminium and aluminium alloy.
This Standard applies to the continuous roll-casting strips of aluminium and
aluminium alloy (hereinafter referred to as the continuous roll-casting strips).
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
GB/T 3190 Wrought aluminium and aluminium alloy - Chemical composition
GB/T 3199 Wrought Aluminium and Aluminium Alloy Products - Packing,
Marking, Transporting and Storing
GB/T 3246.2 Inspection method for structure of wrought aluminum and
aluminum alloy products - Part 2: Inspection method for macrostructure
GB/T 7999 Optical emission spectrometric analysis method of aluminum and
aluminum alloys
GB/T 8170 Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 16865 Test pieces and method for tensile test for wrought aluminium
and magnesium alloys products
GB/T 17432 Methods for sampling for analyzing the chemical composition of
wrought aluminum and aluminum alloys
GB/T 20975 (all parts) Methods for chemical analysis of aluminium and
aluminium alloys
GB/T 26492.2 Defects of wrought aluminium and aluminium alloys ingots
and products - Part 2: Defects for roll-casting strips
GB/T 32186-2015 Test methods of cleanliness of aluminium and aluminium
alloy ingots
3 Terms and definitions
The terms and definitions defined in GB/T 26492.2 and the following apply to
this document.
3.1 Longitudinal thickness difference
The maximum difference between the thickness of any two points at the same
distance from the edge measured along the longitudinal direction of the
continuous roll-casting strips.
3.2 Edge thickness
The thickness measured at 50 mm from the side edge of the continuous roll-
casting strips (see H1, H2 in Figure 1).
3.3 Edge thickness difference
The difference between the thickness of the two edges measured at 50 mm
from both side edges (see H1, H2 in Figure 1) on any cross-section of the
continuous roll-casting strips.
3.4 Adjacent points thickness difference
The thickness difference between any two thickness measurement points of
100 mm apart [such as H0 and Hm1 (or Hn1), Hm1 and Hm2, Hn1 and Hn2 in Figure
1] on any cross-section of the continuous roll-casting strips.
and “Other” columns of the corresponding designations in Table 2 and GB/T
3190. When the mass fraction of unconventional analytical elements is
suspected to exceed the limit values of this Standard, producers shall analyze
these elements.
5.2.3 The judgement of analytical numerical values adopts the rounding-off
comparison method. The rules of rounding off for numerical values shall be in
accordance with the relevant provisions of GB/T 8170. The rounding-off digit
shall be consistent with the limit digit specified in Table 2 or GB/T 3190.
5.3 Dimensional deviation
5.3.1 USE a micrometer with a precision of not less than 0.01 mm (or the same-
precision measuring tool), at any point of the test piece of the continuous roll-
casting strips not less than 50 mm from the edge, to measure the edge
thickness of the continuous roll-casting strips. According to the measurement
positions shown in Figure 1, MEASURE the thickness of each point.
5.3.2 On the test piece of the continuous roll-casting strips, USE a steel plate
(tape) ruler with a precision of 1 mm or a measuring tool of corresponding
precision to measure the width of the continuous roll-casting strips.
5.3.3 Calculate the edge thickness difference (3.3), adjacent points thickness
difference (3.4), intermediate crown (3.5), and the relative transverse thickness
difference (3.7) of each test piece. Calculate the maximum difference in the
measurement results of the thickness at points equidistant from the edge
between the test pieces, i.e. longitudinal thickness difference (3.1). Calculate
the maximum difference in the measurement results of the intermediate crown
between the test pieces, i.e. intermediate crown difference (3.6).
5.3.4 The dislocation layer and tower-shape of the continuous roll-casting strips
are measured using a steel plate (tape) ruler with a precision of 1 mm or a
measuring tool of corresponding precision.
5.4 Tensile mechanical properties at room temperature
The room-temperature tensile test of the continuous roll-casting strips is carried
out in accordance with the provisions of GB/T 16865.
5.5 Macrostructure
The microstructure test of the continuous roll-casting strips is carried out in
accordance with the provisions of GB/T 3246.2.
5.6 Inspection method of appearance quality
The appearance quality is visually inspected and, if necessary, measured using
a steel plate (tape) ruler with a precision of 1 mm or a measuring tool of
corresponding precision.
6 Inspection rules
6.1 Inspection and acceptance
6.1.1 The continuous roll-casting strips shall be inspected by the supplier, to
ensure that the quality of the strips meets the requirements of this Standard.
The quality certificate shall be filled out.
6.1.2 The purchaser shall inspect the received continuous roll-casting strips in
accordance with the provisions of this Standard. When the inspection result is
inconsistent with the provisions of this Standard and the order form (or contract),
it shall be submitted to the supplier in writing and shall be settled by negotiation
between the supplier and the purchaser. Any objection to the appearance
quality shall be filed within 1 month from the date of receipt of the continuous
roll-casting strips. Any other objection shall be filed within 3 months from the
date of receipt of the continuous roll-casting strips. If arbitration is required, the
arbitration sampling shall be made at the purchaser place and jointly carried out
by both the supplier and the purchaser.
6.2 Lot grouping
The continuous roll-casting strips shall, in coils, be submitted for acceptance.
6.3 Weighing
The continuous roll-casting strips shall be weighed in coils.
6.4 Inspection items
6.4.1 Each lot of continuous roll-casting strips, before leaving the factory, shall
be inspected for chemical composition, edge thickness deviation, width
deviation, edge thickness difference, intermediate crown, macrostructure, and
appearance quality.
6.4.2 The continuous roll-casting strips shall be sampling-inspected for
longitudinal thickness difference, adjacent points thickness difference, the
relative transverse thickness difference, intermediate crown difference, and
hydrogen content.
6.4.3 The mechanical properties and slag content are guaranteed by the
supplier process. When the purchaser requires the mechanical properties and
inspection, print the following mark (or attach a label):
a) Product name;
b) Designation;
c) Dimension specifications;
d) Product lot number or coil number;
e) Net weight;
f) Inspection imprint of the quality inspection department of the supplier or
inspection imprint of the quality inspector.
7.1.2 Packing marking
The packing marking of the continuous roll-casting strips shall comply with the
provisions of GB/T 3199, or otherwise agreed between the supplier and the
purchaser.
7.2 Packing, transporting, storing
The method of packing the continuous roll-casting strips shall be stated in the
order form (or contract). Other packing, transporting, and storing requirements
shall be in accordance with GB/T 3199.
7.3 Quality certificate
Each lot of the continuous roll-casting strips shall be accompanied by a product
quality certificate indicating:
a) Name, address, telephone number, and fax of the supplier;
b) Product name;
c) Designation, dimension specifications;
d) Lot number or coil number;
e) Net weight;
f) This Standard number;
g) Inspection results of various analysis items and imprint of the technical
supervision department;
h) Packing date (or exit-factory date).
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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