SIST EN 3451:2017

Overview

EN 3451:2017 (CEN) is a European aerospace material standard that specifies requirements for Titanium TI-P99002, Grade 2 forging stock intended for annealed forgings with cross-section a or diameter D ≤ 300 mm. The standard applies to material supplied in the not heat treated delivery condition and is part of the EN aerospace metallic materials series.

This standard defines composition limits, mechanical property criteria, delivery requirements and relevant test/inspection references to ensure fitness for aerospace forgings.

Key Topics

• Material designation: Titanium TI-P99002, Grade 2 forging stock for annealed forgings.
• Delivery condition: Not heat treated (delivery code U) for material intended to be annealed prior to final forging operations.
• Dimensional limit: Applicable for stock with a or D ≤ 300 mm.
• Chemical composition: Limits are specified in the standard; key elements include oxygen (max ≈ 0.25 %) and nitrogen (max ≈ 0.05 %). Limits for iron and carbon are also specified. (See the standard for full composition tables and notes on routine acceptance.)
• Mechanical properties: Typical minimums specified include proof stress Rp0,2 ≥ 290 MPa, tensile strength Rm ≥ 390 MPa, elongation A ≥ 20 %, and reduction of area Z ≥ 30 %. These parameters support quality verification for aerospace forging applications.
• Heat treatment for annealing: The reference anneal is given (e.g., 600 °C ≤ T ≤ 800 °C with t ≥ 30 min and air cooling or cooling in inert atmosphere) to achieve the annealed condition for subsequent forging.
• Testing and inspection: Testpiece selection, external/internal defect criteria and batch uniformity are referenced to EN 2858-2 and other normative documents.

Applications

EN 3451:2017 is targeted at manufacturers, material suppliers, procurement and quality engineers in the aerospace supply chain who require a clear specification for titanium forging stock. Typical practical values include:

• Selection of Grade 2 titanium stock for structural forgings where ductility and corrosion resistance are required.
• Contractual material specification on purchase orders to ensure consistent chemical and mechanical characteristics.
• Basis for inspection plans and material verification during incoming goods control and product qualification programs.

Using EN 3451:2017 helps reduce procurement risk by aligning supplier production and testing with established aerospace material requirements.

Related Standards

• EN 2858-2 - Forging stock and forgings: technical specifications and test methods (normative reference).
• EN 4258 - General organization of aerospace metallic material standardization.
• EN 4500-004 - Rules for drafting and presentation of titanium standards.

For precise composition tables, full test methods and all notes (including routine acceptance exceptions), consult the full EN 3451:2017 document and the cited normative references.