SIST EN 2816:2019

Overview

SIST EN 2816:2019 is a European standard issued by CEN that specifies the technical requirements for aerospace-grade Steel FE-PM1802, also known as X5CrNiCu15-5. This steel is characterized by its consumable electrode remelted production, solution treatment, and precipitation treatment processes. The standard covers forgings with dimensions up to 200 mm in thickness or diameter (a or D ≤ 200 mm) and ensures a minimum ultimate tensile strength (Rm) of 965 MPa. It is part of the EN metallic materials series designed specifically for aerospace applications, providing consistent quality and performance for critical aerospace components.

Key Topics

• Material Composition: Steel FE-PM1802 (X5CrNiCu15-5) is defined with strict chemical composition limits, including:
  • Chromium (Cr): 14.0% - 15.5%
  • Nickel (Ni): 3.5% - 5.5%
  • Copper (Cu): 2.5% - 4.5%
  • Carbon (C): Max 0.07%
  • Silicon (Si) and Manganese (Mn): Up to 1.0%
  • Other alloying elements such as Niobium + Tantalum (Nb + Ta) up to 0.45%
• Manufacturing Process:
  • Steel is remelted using a consumable electrode technique for purity.
  • Forgings are produced from specified forging stock as per EN 3364.
• Heat Treatment:
  • Solution treatment at 1025°C to 1055°C for at least 30 minutes.
  • Followed by precipitation treatment between 580°C and 610°C for a minimum of 4 hours.
  • Air cooling or oil quenching applied to achieve required microstructure and mechanical properties.
• Mechanical Properties:
  • Minimum tensile strength (Rm) of 965 MPa.
  • Yield strength (Rp0.2) of at least 790 MPa.
  • Elongation between 9% and 12%.
  • Hardness limited to between 302 and 363 HV.
  • Impact strength withnotch (KV) ≥ 100 J in transverse (T) direction.
• Dimensions: Forgings up to 200 mm in thickness or diameter are specified, ensuring suitability for medium-sized aerospace components.
• Quality and Inspection:
  • Compliance with EN 2157-3 for forging specifications.
  • Inspection includes dimensional, marking, and batch uniformity verification.
  • Grain size and external discontinuities are controlled as per referenced standards.

Applications

SIST EN 2816:2019 steel is tailored for applications within the aerospace industry where high strength, corrosion resistance, and reliability are critical. Typical use cases include:

• Structural aerospace components requiring excellent fatigue resistance and high tensile strength.
• Critical forgings for aircraft engine parts, landing gear components, and airframe assemblies.
• Precision aerospace forgings up to 200 mm thickness or diameter where mechanical performance must meet strict regulatory standards.
• Components that require advanced heat treatment to achieve enhanced mechanical properties and durability under operational stress.

This standard supports manufacturers and suppliers in producing consistent, certified materials that comply with international aerospace quality expectations.

Related Standards

• EN 3364 – Covers the technical specifications for steel FE-PM1802 forging stock, applicable for initial stock materials.
• EN 2157-3 – Addresses requirements for pre-production and production forgings, including testing and inspection methods used in conjunction with EN 2816.
• EN 4258 – Provides general guidance on the organization of aerospace metallic material standards, framing how EN 2816 fits within the broader aerospace materials standardization.
• EN 4500-005 – Sets the drafting rules for aerospace steel materials standards, ensuring consistency in presentation and technical requirements.

Summary

SIST EN 2816:2019 is an essential standard for aerospace manufacturers and suppliers dealing with Steel FE-PM1802 (X5CrNiCu15-5) forgings. By specifying precise chemical composition, heat treatment, mechanical properties, and dimensional criteria, it ensures the steel’s suitability for demanding aerospace applications. Compliance with this standard guarantees high-performance forgings with superior strength and reliability, crucial for the safety and efficiency of aerospace systems.

Keywords: SIST EN 2816:2019, aerospace steel standard, FE-PM1802, X5CrNiCu15-5, consumable electrode remelted steel, solution treated steel, precipitation treated steel, aerospace forgings, mechanical properties, CEN standards, aerospace materials specification.