Element FolioElement FolioAdvanced Materials IntelligencePSEMIC ERP ↗

AISI 321 Stainless Steel

STEEL GRADE · STAINLESS 321

AISI 321 Stainless Steel

AISI 321 is a titanium-stabilized austenitic stainless steel developed for improved resistance to sensitization during elevated-temperature exposure.

Grade overview

Titanium stabilizes carbon and reduces chromium-carbide precipitation under appropriate conditions.

Typical applications

Aircraft exhaust components, high-temperature ducting, heat-exchanger parts and process equipment subject to elevated-temperature exposure.

Equivalent / related designations

EN 1.4541 is a commonly compared designation. Stabilization does not make the grade universally superior to 304L or 316L; service environment governs selection.

Common manufacturers and supply

Produced by major stainless and specialty flat/bar/tube mills.

Fabrication and selection notes

Confirm the exact product standard, edition, dimensions, delivery condition, mechanical properties, impact requirements, heat treatment, welding procedure, corrosion environment and certification. A grade name alone is not sufficient for procurement or design approval.

QA/QC documentation

For critical service, verify heat number traceability, mill test certificate, chemical analysis, tensile/impact results where required, NDT, heat-treatment record and project-specific third-party inspection requirements.

Element Folio engineering reference. Values and requirements vary by standard edition, product form and manufacturer; always verify the latest governing specification.