EN 3918:1998

Overview

EN 3918:1998 (CEN) defines requirements for the aerospace series nickel‑base alloy NI‑B41201 (NiCr14Si5B3C) used as a filler metal for brazing - tape form. The standard applies to the manufacture, identification and supply of brazing tape intended for high‑performance aerospace joining applications where a nickel‑chromium‑silicon‑boron‑carbon alloy is required.

Key topics and requirements

While the full standard text contains the definitive technical clauses, EN 3918:1998 focuses on requirements typically associated with aerospace brazing filler‑metal tape, including:

• Material identification: designation as NI‑B41201 and chemical designation NiCr14Si5B3C.
• Form and supply condition: tape geometry and packaging suitable for aerospace use.
• Manufacturing and quality: production and quality control criteria to ensure consistent filler‑metal properties.
• Inspection and testing: requirements for chemical analysis, appearance, and acceptance criteria as applicable to brazing consumables.
• Marking and traceability: labelling, batch identification and documentation required for aerospace quality systems.
• Handling and storage: recommendations to preserve tape condition prior to brazing operations.

Note: EN 3918:1998 is specifically limited to the filler metal in tape form and does not itself prescribe brazing procedures or joint design - those are addressed in complementary process and design standards.

Applications

EN 3918:1998 is intended for organizations that specify, produce, procure or use nickel‑base brazing tapes in aerospace contexts:

• Aerospace manufacturers and subcontractors performing brazing of nickel‑base components.
• Repair and overhaul facilities working on gas turbine parts, airframe assemblies, or other high‑temperature assemblies where nickel alloy filler metals are required.
• Procurement and quality engineers who must ensure supplied filler metals meet CEN aerospace specifications.
• Materials and process engineers developing brazing procedures for nickel‑chromium base alloys.

Using EN 3918:1998 helps ensure consistent performance, traceability and regulatory compliance for brazing operations where the NiCr14Si5B3C chemistry is specified.

Related standards

For complete brazing practice and qualification, EN 3918:1998 is typically used alongside other CEN and industry standards addressing:

• Brazing procedure specification and qualification
• Base‑metal material specifications (e.g., nickel‑base superalloys)
• Test methods for filler metals and brazed joints

When specifying or procuring filler metal tape, reference EN 3918:1998 (NI‑B41201, NiCr14Si5B3C) in purchase documents to ensure correct material, traceability and aerospace conformance.