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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Nonferrous Metals Industry Association.
This standard is under the jurisdiction of National Technical Committee on Nonferrous Metals of Standardization Administration of China (SAC/TC 243).
Aluminium and aluminium alloy sheets and strips used for motor
1 Scope
This standard specifies the requirements, test methods, inspection rules, marking, packaging, transportation and storage, quality certificates and order (contract) contents of the aluminium and aluminium alloy sheets and strips used for motor.
This standard is applicable to the aluminium and aluminum alloy sheets (hereinafter referred to as “sheets”) and the aluminium and aluminum alloy strips (hereinafter referred to as “strips”) for motor cover panels, motor body structurals, station wagon skin panels (hereinafter referred to as skin panels).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1031 Geometrical product specifications (GPS) - Surface texture: Profile method - Surface roughness parameters and their values
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 3246.1 Inspection method for structure of wrought aluminum and aluminum alloy products - Part 1: Inspection method for microstructure
GB/T 3880.1 Wrought aluminium and aluminium alloy plates, sheets and strips for general engineering - Part 1: Technical conditions of delivery
GB/T 3880.2 Wrought aluminium and aluminium alloy plates, sheets and strips for general engineering - Part 2: Mechanical properties
GB/T 3880.3-2012 Wrought aluminium and aluminium alloy plates, sheets and strips for general engineering - Part 3: Tolerances on forms and dimensions
GB/T 4780 Terms for motor vehicle body
GB/T 5027 Metallic materials - Sheet and strip - Determination of plastic strain ratio
GB/T 5028 Metallic materials - Sheet and strip - Determination of tensile strain hardening exponent
GB/T 7999 Optical emission spectrometric analysis method of aluminum and aluminum alloys
GB/T 8013.3 Anodic oxide coatings and organic polymer coatings on aluminium and its alloys - Part 3: Organic polymer coatings
GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values
GB/T 12160 Calibration of extensometers used in uniaxial testing
GB/T 16825.1 Verification of static uniaxial testing machines - Part 1: Tension/compression testing machines - Verification and calibration of the force-measuring system
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 24171.2 Metallic materials - Sheet and strip - Determinations of forming limit curves - Part 2: Determinations of forming limit curves in laboratory
GB/T 26492.3 Defects for wrought aluminium and aluminium alloys ingots and products - Part 3:Defects for plates, sheets and strips
JJG 139 Tension, Compression and Universal Testing Machines
3 Requirements
3.1 Product classification
3.1.1 Designation, state, dimension and specification
The designations, supply states, dimensions and specifications of the product shall meet those specified in Table 1. Other designations, states, dimensions and specifications, if necessary, shall be determined by the supplier and the purchaser through negotiation and be indicated in the order (contract).
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Table 1 Designations, supply states, dimensions and specifications of the product
Designation Supply
state State of test piece Sheet specification
mm Strip specification
mm Typical use
Thickness Width Length Thickness Width Inside diameter Outside diameter
405,
505,
605 ≤2 000 Body structural
(e.g., heat shield)
Body structural
(e.g., heat shield)
Body structural
(e.g., headlamp cover)
Body structural
(e.g., heat shield)
Body structural
(e.g., valve)
Body structural
(e.g., body connector)
3003 Body structural
(e.g., body connector)
Skin
3004 Body structural
(e.g., boxcar)
Skin
Body structural
(e.g., boxcar)
Body structural (e.g., fuel tank heat shield,
B-pillar
Body structural
(e.g., body connector)
5052 Body structural (e.g., pedal, heat shield, navigation border and back panel)
Skin
5754 O O Body structural (e.g., brake booster)
Cover panel
(e.g., door inner panel)
5182 O O Body structural
(e.g., bonnet)
Cover panel
(e.g., door inner panel)
Body structural
(e.g., bumper)
Cover panel (e.g., inner and outer panels of front engine cover)
Cover panel (e.g., inner and outer panels of front engine cover)
Cover panel (e.g., inner and outer panels of front engine cover)
Cover panel (e.g., inner and outer panels of front engine cover)
Cover panel (e.g., inner and outer panels of front engine cover)
Cover panel (e.g., inner and outer panels of front engine cover)
Body structural (e.g., battery box cover)
Body structural
(e.g., structural support)
Cover panel (e.g., inner and outer panels of front engine cover)
Body structural
(e.g., cover)
a T4P state is such a state that the product is stabilized at a lower value of strength within a certain period after a solution heat treatment and a special aging treatment.
b T6B state is such a state that the sheets in the T4P state are subjected to a simulated baking treatment.
3.1.2 Surface processing methods and surface treatment methods
The product is classified into 2 types according to the surface processing methods (see Table 2) and 4 types according to the surface treatment methods (see Table 3).
Table 2 Surface processing methods
Surface processing method a Code Explanation
Rolled surface MF Product surface rolled by a roll using grinding wheel
Textured surface EDT Product surface rolled by a roll using electrical discharge texturing
a Surface processing method shall be indicated in the order (or contract). If not indicated, the product shall be supplied by the rolled surface (MF).
Table 3 Surface treatment methods
Surface treatment methods a Code Explanation
Chemical cleaning b NP Product surface treated with acid or alkali liquid
Passivation b P Product surface treated with a specified pretreatment agent
Dry oiling c DO Product surface coated with specified solid grease
Wet oiling c EO Product surface coated with specified liquid grease
a Surface treatment methods can be omitted, or multiple items can be selected at the same time.
b Surface treatment methods shall be indicated in the order (or contract).
c Only one of the oiling methods can be selected.
3.1.3 Service characteristics and positions
The product for cover panel is classified into 5 types (see Table 4) according to service characteristics and 2 types according to service positions (see Table 5).
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Table 4 Service characteristics
Service characteristic Code Explanation
For standard sheets S For products without special requirements on the surface and property
For high-strength bake hardening sheets IBR For products with significant increase in strength after baking
For high-strength flange plates IH For products requiring better flanging property
For high-strength plates HS For products at high-strength positions
For low-strain plates RSS For 5××× products at low-strain positions
Table 5 Service positions
Service position Code Explanation
Inner panel U For products at unexposed parts of the cover panel
Outer panel E For products at exposed parts of the cover panel
3.1.4 Labeling example
The product is labeled in the order of product name, service characteristic code, service position code, standard number, designation, supply state, and dimension/specification. Below are labeling examples:
Example 1:
The sheets for structural parts in the state of O, with a designation of 5182, a thickness of 1.50 mm, a width of 1500.0 mm and a length of 3000.0 mm are labeled as follows:
Sheet GB/T 33227-5182O 1.5×1 500×3 000
Example 2:
The sheets for low-strain inner panels in the state of O, with a designation of 5182, a thickness of 1.50 mm, a width of 1500.0 mm and a length of 3000.0 mm are labeled as follows:
Sheet RSS-U GB/T 33227-5182O 1.5×1 500×3 000
Example 3:
Standard sheets, inner panels as well as the sheets in the state of T4P, with a designation of 6016, a thickness of 1.00 mm, a width of 1500.0 mm and a length of 3000.0 mm are labeled as follows:
Sheet S-U GB/T 33227-6016T4P 1.0×1 500×3 000
Example 4:
The sheets for high-strength bake hardening inner panels in the state of T4P, with a designation of 6016, a thickness of 1.00 mm, a width of 1500.0 mm and a length of 3000.0 mm are labeled as follows:
Sheet IBR-U GB/T 33227-6016T4P 1.0×1 500×3 000
1 Scope
2 Normative references
3 Requirements
4 Test methods
5 Inspection rules
6 Marking, packaging, transportation and storage as well as quality certificate
7 Order (or contract) content
Annex A (Normative) Determination of percentage total extension at maximum force and percentage yield point extension
Annex B (Normative) Test method for bake hardening property
Annex C (Normative) Test method for flanging property
Annex D (Normative) Paint line test
Annex E (Normative) Test method for dent resistance
Annex F (Normative) Test for high-speed tensile property
Annex G (Normative) Determination of oiling amount
