SAE AMS4078L-2023
Aluminum Alloy Sheet and Plate, 5.6Zn - 2.5Mg - 1.6Cu - 0.23Cr, 7075: (-T73 Sheet, -T7351 Plate), Solution Heat Treated and Overaged

Standard No.

SAE AMS4078L-2023

Release Date

2023

Published By

Society of Automotive Engineers (SAE)  US  /  SAE

Latest

SAE AMS4078L-2023

Introduction

Standard Evolution and Technical Background

AMS4078L, SAE International's latest revised aerospace material specification for 2023, continues the technical framework first published in 1967.

Parameter Type	Plate Specifications	Sheet Specifications
Thickness Range	0.991-101.6mm	0.039-4 inches
Alloy Type	7075-T7351 / 7075-T73 (UNS A97075)
Main Components	5.6Zn-2.5Mg-1.6Cu-0.23Cr

2. Mechanical Properties

Typical Application Case: When a certain aircraft wing spar uses 7075-T7351 plate (2.5 inches thick):

• Tensile Strength ≥66 ksi (455 MPa)
Thick Plate Solution Treatment+2% Elongation+T7351 Aging ANSI H35.1

2. Corrosion Protection Requirements

Achieve stress corrosion protection through the correlation control of electrical conductivity and mechanical properties:

• Class A: Conductivity ≥40% IACS (23.2 MS/m)
• Class B: When the conductivity is 38-39.9% IACS, the yield strength does not exceed the standard lower limit of 11.9ksi
• Conductivity <38% IACS will be directly scrapped

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Quality Assurance System

1. Inspection Item Matrix

Inspection Type	Inspection Items	Implementation Standard
Mandatory Inspection Items	Composition Analysis/Tensile Properties/Electrical Conductivity	AMS2355
Optional Items	Ultrasonic Testing (Thickness ≥ 12.7mm)	ASTM B594
Cyclic Test	Stress Corrosion Test (Thickness ≥ 19.05mm)	Clause 3.3.3

2. Special Situation Handling

Products outside the standard range must be marked with the AMS4078L(EXC) logo and clearly stated in the test report:

1. Dimensions outside the range of Clause 1.1
2. Any exceptions to the technical requirements in Chapter 3
3. Parameters specifically approved by the purchaser

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Implementation Recommendations

1. Procurement Technical Requirements

According to Clause 8.6, the procurement documents shall at least include:

• Standard number AMS4078L and revision status
• Precise dimensional requirements for plates/sheets
• Special performance indicators when outside the standard range
• Ultrasonic testing level requirements (if applicable)

2. Supply Chain Management

The new regulations require that within 18 months of publication (until May 2025):

• The procurement/production/distribution of metal raw materials must comply with the AS6279 standard
• Establish a traceable raw material batch management system
• Unauthorized technical exceptions are prohibited

SAE AMS4078L-2023 Referenced Document

• ANSI H35.2 American National Standard Dimensional Tolerances for Aluminum Mill Products
• ANSI H35.2M Dimensional Tolerances for Aluminum Mill Products (Metric)
• ASTM B594 Standard Practice for Ultrasonic Inspection of Aluminum-Alloy Wrought Products for Aerospace Applications
• ASTM B660 Standard Practices for Packaging/Packing of Aluminum and Magnesium Products
• ASTM B666/B666M Standard Practice for Identification Marking of Aluminum and Magnesium Products

SAE AMS4078L-2023 history

• 2023 SAE AMS4078L-2023 Aluminum Alloy Sheet and Plate, 5.6Zn - 2.5Mg - 1.6Cu - 0.23Cr, 7075: (-T73 Sheet, -T7351 Plate), Solution Heat Treated and Overaged
• 2018 SAE AMS4078K-2018 Aluminum Alloy Sheet and Plate 5.6Zn – 2.5Mg-1.6Cu-0.23Cr 7075: (-T73 Sheet@ -T7351 Plate) Solution Heat Treated and Overaged (UNS A97075)
• 2011 SAE AMS4078J-2011 Aluminum Alloy Sheet and Plate 5.6Zn 2.5Mg 1.6Cu 0.23Cr 7075: (-T73 Sheet -T7351 Plate) Solution Heat Treated and Overaged
• 2011 SAE AMS4078D-2011 ALUMINUM ALLOY PLATE 5.6Zn - 2.5Mg - 1.6Cu - 0.23Cr (7075-T7351) Solution Heat Treated, Stress Relieved, and Overaged
• 2010 SAE AMS4078H-2010 Aluminum Alloy Sheet and Plate 5.6Zn 2.5Mg 1.6Cu 0.23Cr 7075 (-T73 Sheet -T7351 Plate) Solution Heat Treated, Stress Relieved, and Overaged
• 2007 SAE AMS4078G-2007 Aluminum Alloy Plate (7075-T7351) Solution Heat Treated, Stress Relieved, and Overaged UNS A97075
• 2000 SAE AMS4078F-2000 Aluminum Alloy Plate (7075-T7351) Solution Heat Treated, Stress Relieved, and Overaged
• 1992 SAE AMS4078E-1992 Aluminum Alloy Plate 5.6Zn - 2.5Mg - 1.6Cu - 0.23Cr (7075-T7351) Solution Heat Treated@ Stress Relieved@ and Overaged (UNS A97075)
• 1984 SAE AMS4078C-1984 ALUMINUM ALLOY PLATE 5.6Zn - 2.5Mg - 1.6Cu - 0.23Cr (7075-T7351) Solution Heat Treated, Stress Relieved, and Overaged
• 1974 SAE AMS4078B-1974 ALUMINUM ALLOY PLATE 5.6Zn - 2.5Mg - 1.6Cu - 0.26Cr (7075-T7351)
• 1967 SAE AMS4078A-1967 ALUMINUM ALLOY PLATE 5.6Zn - 2.5Mg - 1.6Cu - 0.30 Cr (7075-T7351) Stress-Relief Stretched
• 1967 SAE AMS4078-1967 ALUMINUM ALLOY PLATE 5.6Zn - 2.5Mg - 1.6Cu - 0.30 Cr (7075-T7351) Stress-Relief Stretched

Standard and Specification