SIST EN 3470:2019

Overview

SIST EN 3470:2019 specifies requirements for steel FE-PM1503 (X3CrNiMoAl13-8-2) forgings primarily used in aerospace applications. This high-strength stainless steel is produced by vacuum induction melting and consumable electrode remelting, ensuring excellent purity and consistency. The standard outlines the necessary solution and precipitation treatments, dimensional limits (a or D ≤ 150 mm), and mechanical properties (ultimate tensile strength Rm between 1,200 MPa and 1,400 MPa). Developed by SIST as a national adoption of EN 3470:2019, this document is vital for aerospace manufacturers, designers, and quality control professionals working with advanced forged steel components.

Key Topics

• Material Specification: FE-PM1503 (X3CrNiMoAl13-8-2), a corrosion-resistant, precipitation hardening stainless steel with controlled chemical composition and mechanical properties.
• Manufacturing Process:
  • Vacuum induction melted (VIM) and consumable electrode remelted (VAR/ESR) to minimize impurities and enhance material uniformity.
  • Specific forging techniques as referenced by EN 2157-3 and EN 3359.
• Heat Treatment:
  • Solution treated and precipitation treated for optimal strength and performance.
• Dimensional Constraints:
  • Applies to forgings where the thickness or diameter (a or D) is 150 mm or lower.
• Mechanical Properties:
  • Ultimate tensile strength (Rm) between 1,200 MPa and 1,400 MPa.
  • Additional requirements such as proof stress, elongation, reduction in area, hardness, and grain size detailed in relevant tables.
• Quality Assurance:
  • Qualification, inspection, marking, and uniformity requirements to ensure reliability for demanding aerospace uses.

Applications

SIST EN 3470:2019 is referenced widely in the aerospace and defense industries for the specification and procurement of high-strength steel forgings. Typical applications include:

• Aircraft structure and engine components: Used where exceptional strength, corrosion resistance, and toughness are required.
• Landing gear parts: The material's high tensile strength and ductility make it ideal for parts subjected to heavy loads and fatigue cycles.
• Rotating machinery: Forgings used in shafts, gears, and mechanical systems benefit from the uniform quality produced by the melting and heat treatment process outlined in this standard.
• Critical fasteners and fittings: Reliable performance under variable temperature and stress conditions in aerospace environments.

Ensuring compliance with SIST EN 3470:2019 supports safety, extend component life, and meets rigorous aerospace quality requirements.

Related Standards

For a comprehensive approach to steel forgings in aerospace, the following standards are referenced in or related to SIST EN 3470:2019:

• EN 2157-3: Aerospace series - Steel for forging stock and forgings - Technical specification, including inspection and qualification requirements.
• EN 3359: Detailing FE-PM1503 forging stock up to 300 mm.
• EN 4258: Organization of metallic material standards for aerospace applications.
• EN 4500-005: Rules for drafting and presentation of aerospace metallic material standards.
• EN 4700-002: Technical specification for wrought steel and heat resisting alloys in bar and section form.

By referencing and implementing these related standards alongside SIST EN 3470:2019, aerospace industry professionals can ensure the quality, compatibility, and safety of their forged steel components and products.

Keywords: aerospace steel forging, FE-PM1503, X3CrNiMoAl13-8-2, vacuum induction melted, consumable electrode remelted, solution treatment, precipitation treatment, high-strength steel, SIST EN 3470, EN 3470:2019, aerospace materials standard, forging specification.