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304 vs 304L Stainless Steel Grade Selection Guide
Use five purchase questions to identify the next engineering review path. This guide does not approve material suitability and never treats 304L as a universal upgrade.
Enter the service and fabrication boundaries
Decision basis used by this guide
- BSSA lists 0.08% maximum carbon for 304 and 0.030% for 304L in the cited AISI composition comparison.
- Lower carbon addresses sensitization risk after relevant thermal exposure; it does not add molybdenum or solve every corrosion and weld-procedure risk.
- Chloride, sustained high temperature and nitric-acid service require application-specific review rather than a one-direction grade ranking.
