GB/T 34480-2023High strength and toughness Al-Zn-Mg-Cu series aluminium alloy forgings (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

This document replaces GB/T 34480-2017 "Aluminum Alloy Forgings Made from Injection Formed Ingots" and is consistent with GB/T 34480-2017. In addition to structural adjustments and editorial changes, the main technical changes are as follows.

a) Added 7050, 7175, 7A85 forgings and 7055T73 forgings to the product classification (see 4.1), deleted 7085T74 and 7085T76 forgings (see 3.1.1 of the 2017 edition);

b) Marks and examples have been changed (see 4.2, 3.1.2 of the 2017 version);

c) Increased the room temperature tensile mechanical properties of 7050, 7175, 7A85 forgings and 7055T73 forgings (see 5.3);

d) Added fracture toughness requirements for 7050, 7055, 7085, and 7A85 forgings (see 5.5);

e) Added the electrical conductivity requirements for 7050, 7175, 7085T7452, 7A85 forgings and 7055T73 forgings (see 5.6), deleted Conductivity requirements for 7085T74 and 7085T76 forgings (see 3.7 of the 2017 edition);

f) Added the stress corrosion sensitivity factor of 7050 forgings and the stress corrosion resistance performance requirements of 7050, 7085 and 7A85 forgings (see 5.7, 5.8), deleted the stress corrosion resistance of 7085T74 forgings (see 3.8 of the 2017 edition);

g) Added the requirements for spalling corrosion resistance of 7050 forgings and 7055T73 forgings (see 5.9), and deleted the requirements for 7085T76 forgings. Exfoliation corrosion performance (see 3.9 of the 2017 edition);

h) The ultrasonic flaw detection acceptance level has been changed (see 5.10, 3.10 of the 2017 version);

i) The low magnification tissue requirements have been changed (see 5.11, 3.11.1 and 3.11.2 of the 2017 edition);

j) Changed the appearance quality requirements (see 5.13, 3.13 of the 2017 version);

k) The test method has been changed (see Chapter 6, Chapter 4 of the 2017 edition);

l) Added product qualification certification (see Chapter 7);

m) Added process control (see Chapter 8) and deleted quality assurance (see 3.2 of the 2017 version);

n) The inspection rules have been changed (see Chapter 9, Chapter 5 of the 2017 edition);

o) The contents of the logo, packaging, transportation, storage and quality certificate and order form (or contract) have been changed (see Chapter 10, 2017 version of Chapter 6, Chapter 7).

1 Scope

This document specifies the product classification, technical requirements, test methods, and product qualification of high-strength and high-toughness Al-Zn-Mg-Cu aluminum alloy forgings.

Identification, process control, inspection rules, as well as marking, packaging, transportation, storage and quality certificate and order form (or contract) content.

This document applies to high-strength and high-toughness Al-Zn-Mg-Cu aluminum alloy die forgings, free forgings and rolled rings (hereinafter collectively referred to as forgings).

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.

GB/T 3190 Chemical composition of deformed aluminum and aluminum alloys

GB/T 6519-2023 Ultrasonic inspection method for deformed aluminum and magnesium alloy products

GB/T 8005.1 Aluminum and aluminum alloy terminology Part 1: Products and processing techniques

GB/T 8545 Dimensional deviation and machining allowance of aluminum and aluminum alloy die forgings

GB/T 22639-2022 Exfoliation corrosion test method for aluminum alloy products

GB/T 42791 General technical specifications for aluminum alloy forgings for aviation use

3 Terms and definitions

The terms and definitions defined in GB/T 8005.1 apply to this document.

4 Product categories