SIST EN 4377:2015

Overview

SIST EN 4377:2015 is a European standard dedicated to the specification of a high-performance, heat-resisting alloy known as NiCr19Fe19Nb5Mo3 (material number 2.4668) for use in aerospace applications. This standard outlines the requirements for non heat-treated forging stock with diameter or thickness (a or D) not exceeding 300 mm. Developed under the umbrella of the Aerospace and Defence Industries Association of Europe, SIST EN 4377:2015 ensures material consistency, reliability, and traceability in the demanding environment of aerospace manufacturing.

Key Topics

• Material Specification: Details the chemical composition and material properties of NiCr19Fe19Nb5Mo3 (2.4668), a nickel-chromium-iron-based heat resistant alloy containing niobium and molybdenum.
• Product Form: The standard applies specifically to forging stock supplied in a non heat-treated condition.
• Dimensional Range: Covers material with thickness or diameter up to 300 mm, accommodating a wide array of aerospace components.
• Quality Control: Refers to inspection methods involving both external and internal defects, macrostructure, and marking, as guided by referenced standards.
• Testing Requirements: Outlines performance indicators such as proof stress, ultimate tensile strength, elongation, reduction of area, and hardness, suitable for ensuring high material standards in aerospace applications.

Applications

NiCr19Fe19Nb5Mo3 alloy forging stock, as defined by SIST EN 4377:2015, plays a crucial role in the aerospace sector due to its high-temperature strength and resistance to oxidation and corrosion. Typical practical uses include:

• Engine Components: Used in the manufacture of turbine disks, rings, and shafts, where heat resistance and mechanical strength are critical.
• Structural Parts: Ideal for critical structural forgings in aircraft and spacecraft where reliability under stress and elevated temperatures is essential.
• Landing Gear and Fasteners: Employed in high-load and thermally demanding locations owing to its robust mechanical properties.
• Spacecraft Equipment: Utilized for parts exposed to extreme environments, ensuring longevity and safety.

Manufacturers and aerospace suppliers benefit from using materials defined in SIST EN 4377:2015 by meeting stringent industry requirements, facilitating compliance with international procurement, and ensuring product compatibility and safety.

Related Standards

To ensure comprehensive compliance and integration within the aerospace industry, SIST EN 4377:2015 makes reference to several essential European standards:

• EN 2043: Aerospace series - Metallic materials - General requirements for semi-finished product qualification (excluding forgings and castings).
• prEN 2860-02: Aerospace series - Heat-resisting alloys - Forging stock and forgings - Technical specification - Part 2: Forging stock.
• EN 4258: Aerospace series - Metallic materials - General organization of standardization and links between EN standards.
• EN 4500-003: Aerospace series - Metallic materials - Rules for drafting and presentation of material standards, focusing on heat-resisting alloys.

These associated standards collectively support the production, qualification, and traceability of metallic materials within aerospace manufacturing, enabling consistent quality across European and international projects.

By adhering to SIST EN 4377:2015, manufacturers and aerospace engineers can confidently specify, procure, and utilize NiCr19Fe19Nb5Mo3 forging stock, optimizing performance, reliability, and compliance in critical aerospace applications.