BS EN 3311:2023
Tracked Changes. Aerospace series. Titanium alloy TI-P64001 (Ti-6Al-4V). Annealed. Bars for machining. D ≤ 300 mm. 900 MPa ≤ Rm ≤ 1160 MPa

Standard No.

BS EN 3311:2023

Release Date

2023

Published By

British Standards Institution (BSI)  GB  /  BSI

Latest

BS EN 3311:2023

Introduction

Core changes and scope of application of the standard

BS EN 3311:2023, as an alternative version of EN 3311:2009, mainly updates the upper limit of the diameter range of titanium alloy bars from 100mm to 300mm. This standard is applicable to annealed Ti-6Al-4V alloy bars that need to be processed in the aerospace field, and requires the tensile strength Rm to be maintained in the range of 900-1160MPa.

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Detailed explanation of material technical requirements

Performance indicators	D≤75mm	75
Yield strength Rp0.2	≥830MPa	≥830MPa
Elongation A	≥10%	≥8%
Sectional shrinkage Z	≥25%	≥20%

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Testing and quality control requirements

• Ultrasonic testing: Diameter ≤100mm shall comply with Class 5 standard, >100mm shall comply with Class 4 standard (according to EN 4050-1)
• Microstructure: It must comply with the equiaxed α phase distribution requirements specified in EN 3114-002, and continuous grain boundary α phase is prohibited
• Macrostructure: 2MA3 level defects are allowed for 50-300mm bars, but central segregation defects such as 2MA40-42 must be excluded

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Technological evolution and implementation recommendations

Compared with the 2009 version of the standard, the 2023 version mainly responds to the demand for large-size titanium alloy bars for large rotor components of aero-engines. Notes for implementation:

1. When purchasing materials with a diameter of >100mm, special attention should be paid to the ultrasonic test report
2. The feed rate needs to be controlled during processing to avoid β phase recrystallization
3. Additional low-cycle fatigue testing is recommended for key load-bearing components