EN 3931:1998

Overview

EN 3931:1998 (adopted as SIST EN 3931:2001) is a CEN aerospace series standard that specifies the requirements for the nickel-base filler metal designated NI‑B31001 (NiCr19Si10) supplied in tape form for brazing in aerospace applications. The document defines the product identity and the scope of requirements that manufacturers, purchasers and quality departments should reference when selecting or qualifying brazing tape for aircraft and aerospace component joining.

Key topics

While the published extract identifies the product and scope, standards of this type typically address the following key technical topics and requirements:

• Material designation and identity - official alloy name and trade/designation (NI‑B31001 / NiCr19Si10).
• Product form and dimensions - tape geometry, thickness and width ranges, and permissible tolerances.
• Manufacturing and metallurgical quality - acceptable processes, uniformity and consolidation of powder‑agglomerated tape.
• Chemical composition and analysis - compositional limits or verification methods to ensure the nickel‑chromium‑silicon alloy meets expectations.
• Physical properties and performance - melting/flow characteristics relevant to brazing, compatibility with aerospace base materials.
• Testing and inspection - batch testing, sample preparation, non‑destructive checks and acceptance criteria.
• Packaging, marking and documentation - traceability, batch identification, safety data and conformity certificates for aerospace supply chains.
• Quality and conformity - requirements for manufacturer quality control and purchaser verification.

(Note: the extract specifies the product and scope; the list above describes typical content areas found in CEN aerospace material standards.)

Applications

EN 3931 is relevant for:

• Aerospace manufacturers and OEMs specifying brazing consumables for assemblies and repair.
• Materials engineers and metallurgists selecting nickel‑base filler metals compatible with high‑temperature, corrosion‑resistant joints.
• Brazing specialists and maintenance teams performing precision brazing on engine components, exhaust systems and high‑temperature assemblies.
• Suppliers and quality managers who need to certify product conformity and provide traceable documentation for flight‑critical parts.

Related standards

For full procurement and qualification programs, EN 3931 is typically used alongside other CEN aerospace material standards and international standards on brazing, filler metals, testing methods and quality management for aerospace materials.

Keywords: EN 3931, NI‑B31001, NiCr19Si10, nickel base alloy, brazing filler metal, brazing tape, aerospace standard, CEN, SIST EN 3931.