Compare ER316L and ER308L by molybdenum content, matching base metals, corrosion service, common applications, and substitution risks.
ER316L and ER308L are low-carbon austenitic stainless fillers, but ER316L contains molybdenum while ER308L does not have the same intentional Mo alloying.
Which Base Metals Do They Match?
ER308L is commonly used for 304 and 304L. ER316L is commonly used for 316 and 316L.
Why Does Molybdenum Matter?
Molybdenum supports the alloy system used in 316-series stainless steels and may improve performance in certain localized corrosion conditions.
Can ER316L Be Used on 304?
It may be technically possible in some applications, but unnecessary over-alloying, cost, color match, ferrite, and project requirements should be considered.
Can ER308L Be Used on 316L?
It is generally unsuitable where the weld must match the molybdenum-bearing corrosion performance of 316L.
Can They Be Substituted Without Approval?
No. Confirm the base material, WPS, corrosion environment, and customer requirements.
Dayang Welding supplies both ER308L and ER316L in TIG and MIG formats.
