GB/T 3880.3-2024 Wrought aluminium and aluminium alloy plates, sheets and strips for general engineering - Part 3: Tolerances on forms and dimensions
1 Scope
This document specifies the tolerance grades, technical requirements and test methods for tolerances on forms and dimensions of wrought aluminium and aluminium alloy plates, sheets and strips for general engineering.
This document is applicable to wrought aluminium and aluminium alloy plates, sheets and strips for general engineering (hereinafter referred to as "plates, sheets and strips").
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions 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 8005.1 Aluminium and aluminium alloy - Terms and definitions - Part 1: Product and method of processing and treatment
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 26492.3 Defects for wrought aluminium and aluminium alloys ingots and products - Part 3: Defects for plates, sheets and strips
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 8005.1 and GB/T 26492.3 apply.
4 Symbols
For the purposes of this document, the symbols listed in Table 1 apply.
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Table 1 Symbols and their descriptions
6 Technical requirements
6.1 Thickness
6.1.1 Single point thickness tolerance
6.1.1.1 Cold-rolled plates, sheets and strips
6.1.1.1.1 The length tolerance of cold-rolled plates, sheets and strips is classified into ordinary grade and high-precision grade. When required by the purchaser, the high-precision grade shall be determined by the supplier and the purchaser through negotiation, and indicated in the order (or contract). If the grade is not indicated, it shall be deemed as ordinary grade.
6.1.1.1.2 The ordinary thickness tolerance of cold-rolled plates, sheets and strips shall meet those specified in Table 3; the high-precision thickness tolerance of cold-rolled plates, sheets and strips of Series 2×××, Series 6××× and Series 7××× alloys as well as Series 5××× alloys with the average magnesium limit greater than 3% shall meet those specified in Table 4; the high-precision thickness tolerance of cold-rolled plates, sheets and strips of Series 1×××, Series 3×××, Series 4××× and Series 8××× alloys as well as Series 5××× alloys with the average magnesium limit not greater than 3% shall meet those specified in Table 5.
Foreword i
Introduction iii
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Tolerance grades
6 Technical requirements
7 Test methods
