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Q/BQB 9401-2020: 5000 Series Cold Rolled Aluminum Alloy Plate and Strip for Automobile
Q/BQB 9401-2020
BQB
ENTERPRISE STANDARD OF
BAOWU ALUMINUM TECHNOLOGY CO., LTD
5000 Series Cold Rolled Aluminum Alloy Plate and
Strip for Automobile
ISSUED ON: JUNE 30, 2020
IMPLEMENTED ON: JULY 01, 2020
Issued by: Baowu Aluminum Technology Co., Ltd.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Classification and Code ... 5
4 Marking and Examples ... 7
5 Information Required for Ordering ... 8
6 Technical Requirements ... 8
7 Test Methods ... 14
8 Inspection Rules ... 16
9 Marking, Packaging, Transportation, Storage and Quality Certificate ... 18
5000 Series Cold Rolled Aluminum Alloy Plate and
Strip for Automobile
1 Scope
This Standard specifies the terms and definitions, classification and code, size, shape,
weight, technical requirements, inspection and testing, packaging, marking and
inspection documents of 5000 series cold-rolled aluminum alloy plates and strips for
automobiles.
This Standard is applicable to cold-rolled and cold-rolled coated 5000 series aluminum
alloy plates and strips (hereinafter referred to as aluminum plates and aluminum strips)
for automobiles with a thickness of 0.70mm~4.50mm produced by Baowu Aluminum
Technology Co., Ltd.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) is applicable to this document.
GB/T 228.1 Metallic Materials - Tensile Testing - Part 1: Method of Test at Room
Temperature
GB/T 1031 Geometrical Product Specifications (GPS) - Surface Texture: Profile
Method - Surface Roughness Parameters and Their Values
GB/T 3190 Wrought Aluminum and Aluminum Alloys - Chemical Composition
Limits
GB/T 3199 Wrought Aluminum and Aluminum Alloy Products - Packing, Marking,
Transporting and Storing
GB/T 5027 Metallic Materials – Sheet and Strip – Determination of Plastic Strain
Ratio (r - Values)
GB/T 5028 Metallic Materials - Sheet and Strip - Determination of Tensile Strain
Hardening Exponent (n-Values)
5 Information Required for Ordering
5.1 The user shall provide the following information when ordering:
a) Name of category;
b) Designation and state;
c) Usage;
d) Product specifications and dimensions, dimensional accuracy;
e) Surface texture;
f) Type and thickness of passivation layer;
g) Type and thickness of oiling;
h) Surface quality requirements;
i) Packaging method;
j) Coding requirements;
k) Others.
5.2 If the user has special requirements, it shall be handled through negotiation
between the two parties.
6 Technical Requirements
6.1 Chemical compositions
The chemical composition of 5000 series aluminum alloy automobile plates and
aluminum alloy strips shall comply with the provisions of Table 6.
The measurement value of the size is not allowed to be rounded-off, and the method
of determining the limit value shall comply with the provisions of GB/T 8170.
7.2.2 Thickness, length, width, and outer diameter of roll
The thickness of the base material shall be measured at the distance of no less than
25mm from the side and no less than 115mm from the corner of the end, by a
micrometer with an accuracy of 0.001mm or a measuring tool with the same accuracy.
7.2.3 Unevenness
Take a section of specimen (the specimen shall include the wave part of the product
as much as possible) with a length of 1500mm from the strip, place the specimen freely
on the platform, and check the wave height and wave number in accordance with the
provisions of GB/T 3880.3.
7.2.4 Side curvature
The side curvature of the product is tested in accordance with the provisions of GB/T
3880.3.
7.2.5 Warping height on the end
Cut a 1500mm long plate arbitrarily and freely place it on the platform. When it is
balanced stably, use a steel tape with an accuracy of 1mm to measure the gap between
the two ends of the plate and the platform, that is, the warping height wave height.
7.2.6 Split level, tower type
The split level and tower type of the product shall be inspected with tools of
corresponding accuracy.
7.3 Tensile mechanical properties at room temperature
The tensile test at room temperature of the product shall be carried out according to
the method specified in GB/T 16865.
The test method of strain hardening index n value for the tensile mechanical properties
at room temperature shall comply with the provisions of GB/T 5028; and the test
method of plastic strain ratio r value shall comply with the provisions of GB/T 5027.
The yield point elongation rate and the total elongation rate at the maximum force shall
be measured in accordance with the method specified in GB/T 228.1.
7.4 Surface roughness
The surface roughness shall be measured in accordance with the provisions of GB/T
1031.
7.5 Surface oiling
The amount of oil applied on the surface shall be measured according to the method
negotiated by the supplier and the purchaser.
7.6 Surface passivation layer
The thickness of the passivation layer shall be measured according to the method
specified in GB/T 8013.3.
7.7 Inspection method of appearance quality
The appearance quality of aluminum plates and strips is visually inspected. When
necessary, the defect size may use the size measurement tool to define; and the depth
of the defect may be determined by grinding.
8 Inspection Rules
8.1 Inspection and acceptance
8.1.1 The strip shall be inspected by the supplier to ensure that the quality of the strip
meets the requirements of this standard and the purchase order (or contract); and fill
in the quality guarantee.
8.1.2 The purchaser shall inspect the products received in accordance with the
provisions of this Standard. If the inspection result does not conform to the provisions
of this Standard and the purchase order (or contract), it shall be submitted to the
supplier in written form; and be solved through the negotiation between the supplier
and the purchaser. Objections related to appearance quality and size deviations shall
be submitted within one month from the date of receipt of the product; and objections
related to other properties shall be submitted within three months from the date of
receipt of the product. If arbitration is required, it can be entrusted to an organization
recognized by both the supplier and the purchaser, and samples shall be taken on the
purchaser's side jointly.
8.2 Batching
The strips shall be submitted for acceptance in batches, and each batch shall be
composed of the products with the same designation, state and specification. The
weight of each batch is not limited. When required, it can be negotiated by the two
parties and indicate in the purchase order (or contract).
8.3 Inspection items
Each batch of strips shall be inspected for chemical composition, size deviation,
test), even if one indicator is unqualified, the re-inspection is unqualified, and the entire
roll or batch is unqualified.
9 Marking, Packaging, Transportation, Storage and
Quality Certificate
9.1 Marking and packaging
The packaging, marking and inspection documents of 5000 series cold-rolled
aluminum alloy plates and strips for automobiles shall comply with the provisions of
GB/T 3199. If the purchaser has special requirements for packaging, it shall be
ind...