SIST EN 2031:2018

Overview

SIST EN 2031:2018 is a European standard developed by CEN, specifying requirements for steel 102Cr6 (1.2067) bars that are hardened and tempered for aerospace applications. This standard is part of the aerospace metallic materials series and provides technical specifications ensuring the high-quality production and performance of steel used in critical aerospace components.

The steel grade 102Cr6 (1.2067) is known for its high carbon content and controlled alloying elements, such as chromium, which contribute to its hardness, wear resistance, and toughness. Bars made from this steel and processed by heat treatments, including hardening and tempering, are critical in aerospace bearing and structural parts.

Key Topics

• Material Specifications:

  • Steel grade: 102Cr6 (1.2067)
  • Chemical composition limits:
    • Carbon (C): 0.95–1.10%
    • Silicon (Si): 0.15–0.35%
    • Manganese (Mn): 0.25–0.45%
    • Chromium (Cr): 1.35–1.65%
    • Other elements controlled to ensure optimal mechanical properties
  • Air melting process required for steel production

• Heat Treatment and Delivery Conditions:

  • Delivered as spheroidised bars
  • Hardened at approximately 830°C and quenched
  • Tempering between 150°C and 190°C to achieve desired hardness and mechanical properties
  • Microstructure with fine, non-aligned carbides to optimize durability and strength

• Mechanical Properties:

  • Proof stress, tensile strength, elongation, reduction of area, and hardness measured per aerospace standards
  • Testing includes hardness (HB, HRC), bending, impact strength, and shear strength where applicable
  • Test samples taken from typical disc shapes ensure consistency in results

• Dimensional and Quality Inspections:

  • Dimensional checks during production to maintain precise sizing for aerospace compatibility
  • Marking and inspection protocols align with aerospace traceability requirements
  • Qualification programmes agreed between manufacturers and purchasers ensure compliance

Applications

SIST EN 2031:2018 steel 102Cr6 bars are predominantly used in aerospace components where durability, strength, and resistance to wear are critical. Common practical applications include:

• Bearings: High-performance aerospace bearings require steel that withstands cyclic mechanical loads and stresses while maintaining dimensional stability.
• Structural Components: Hardened and tempered steel bars are used to manufacture parts subjected to stress and temperature variations during flight.
• Precision Aerospace Parts: Components needing exact mechanical properties and microstructure consistency to comply with strict aerospace safety and performance standards.

The standard ensures that bars meet demanding aerospace requirements for mechanical and metallurgical quality to support safe and reliable aircraft operation.

Related Standards

SIST EN 2031:2018 references and aligns with several key aerospace standards to provide a comprehensive material framework:

• EN 4258: General organization of aerospace metallic material standardization and relationships between types of EN standards.
• EN 4500-005: Specific rules for drafting and presenting aerospace steel material standards, ensuring uniform structure and clarity.
• EN 4700-002: Technical specifications for wrought steel and heat-resistant alloys, including bars and sections used within aerospace manufacturing.

By conforming to these integrated standards, SIST EN 2031:2018 supports harmonized aerospace material quality, facilitating interoperability and certification across European aerospace industries.

Keywords: SIST EN 2031:2018, aerospace steel standard, 102Cr6 steel bars, hardened and tempered steel, aerospace metal specifications, steel for aerospace bearings, aerospace grade steel, CEN steel standards, aerospace material certification, aerospace bar manufacturing