GB/T 42793-2024
General technical specifications for aluminum alloy sheets for aviation use (English Version)

Standard No.

GB/T 42793-2024

Language

Chinese, Available in English version

Release Date

2024

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China  CN  /  GB

Latest

GB/T 42793-2024

Introduction

Analysis of the core content of the standard

This standard specifies the full life cycle technical requirements for aviation aluminum alloy plates, including:

• 8 major alloy series (2xxx/7xxx, etc.) with a total of 18 grades
• Dimensional tolerance system with a thickness range of 0.2-203.2mm
• 12 types of mechanical performance indicators and 6 corrosion test methods

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Comparison of key technical requirements

Performance category	Thin plate (＜6.35mm)	Thick plate (≥6.35mm)
Fracture toughness	Plane stress Kc	Plane strain KIC
Residual stress	Not required	Layer cutting method detection
Electrical conductivity uniformity	Grid test spacing ≤610×102mm	Same as left + batch comparison

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Material technology evolution analysis

Compared with the previous generation of standards, the main technological breakthroughs are reflected in:

1. 2H24 The introduction of a new alloy, whose Cu content of 3.8-4.5% is better than that of traditional 2024 alloy
2. The matching relationship between electrical conductivity and mechanical properties becomes a mandatory indicator
3. Phase-controlled array ultrasonic testing replaces conventional ultrasonic testing

Typical application case

7050-T7451 plate application in C919 wing beam:

• CV≤2.5% for ultra-large plate with thickness of 203.2mm
• Three-level aging process is used to control intergranular corrosion sensitivity
• Passed stability verification of 3 furnaces and 10 batches (C_pk≥1.33)

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Implementation suggestions

Key points of production process control

Key processes	Control parameters	Tolerance range
Solution quenching	Temperature	±5℃
Pre-stretching	Deformation	±2.5mm
Aging	Hot holding time	±0.5h

Quality risk prevention and control

• Establish a full process traceability system for melting-casting-hot rolling-heat treatment
• Conductivity grid scanning for each batch (610×102mm matrix)
• Fractograph detection must be carried out for plates with a thickness ≥25mm

GB/T 42793-2024 Referenced Document

• GB/T 12966 The methods for determining aluminium and aluminium alloys conductivity using eddy current
• GB/T 16865 Specimens and methods for tensile testing of deformed aluminum, magnesium and their alloy processed products
• GB/T 17432 Methods for sampling for analyzing the chemical composition of wrought aluminum and aluminum alloys
• GB/T 22639 Test method of exfoliation corrosion for aluminium alloy products
• GB/T 230.1 Metallic materials.Rockwell hardness test.Part 1:Test method
• GB/T 232 Metallic materials - Bend test methods
• GB/T 26492.3 Defects for wrought aluminium and aluminium alloys ingots and products.Part 3:Defects for plates,sheets and strips
• GB/T 3075 Metallic materials—Fatigue testing—Axial force-controlled method
• GB/T 3190 Chemical composition of wrought aluminium and aluminium alloys
• GB/T 3199 Wrought aluminium and aluminium alloy products Packing, marking, transporting and storing
• GB/T 3246.1 Methods for structural examination of deformed aluminum and aluminum alloy products Part 1: Microstructural examination methods
• GB/T 3246.2 Test Method for Microstructure of Deformed Aluminium and Aluminium Alloys Products - Part 2: Low-Magnification Microstructure Test Method*， 2026-04-30 Update
• GB/T 3251 Compression test method for aluminum and aluminum alloy products
• GB/T 33368 High-strength and damage-resistant Al-Cu-Mg aluminum alloy plates and strips
• GB/T 3880.1-2023 Aluminum and aluminum alloy plates and strips for general industrial use Part 1: General requirements
• GB/T 3880.2 Aluminum and aluminum alloy plates and strips for general industrial use Part 2: Mechanical properties*， 2024-04-25 Update
• GB/T 3880.3 Aluminum and aluminum alloy plates and strips for general industrial use Part 3: Dimensional deviations*， 2024-04-25 Update
• GB/T 40321 High strength and toughness Al-Zn-Mg-Cu series aluminium alloy plate
• GB/T 42914 Test Methods for Fracture Toughness of Aluminum Alloy Products*， 2026-05-23 Update
• GB/T 42916 Aluminum and aluminum alloy product identification
• GB/T 6398 Metallic materials—Fatigue testing—Fatigue crack growth method
• GB/T 6519 Ultrasonic inspection method for deformed aluminum and magnesium alloy products
• GB/T 7998 Evaluation method of intergranular corrosion susceptibility of aluminum alloy
• GB/T 7999 Optical emission spectrometric analysis method of aluminum and aluminum alloys
• 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 judgement of limiting values
• YS/T 1619 Aluminium alloys ingot for aviation products
• YS/T 1629.1-2023 Wrought aluminium alloy plates and sheets for aviation product— Part 1: 7050T7451 plate
• YS/T 1629.2 Wrought aluminium alloy plates and sheets for aviation products— Part 2: 2024T351、2H24T351、2324T39 plates
• YS/T 1629.3 Wrought aluminum alloy plates and sheets for aviation products- Part 3: 2124T851 plate
• YS/T 1634 Method for evaluating residual stress of aluminum and aluminum alloy products
• YS/T 590 Deformed aluminum and aluminum alloy flat ingots

GB/T 42793-2024 history

• 2024 GB/T 42793-2024 General technical specifications for aluminum alloy sheets for aviation use

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