Stainless Steel ER 309 / ER 309LMo

Technical Data Sheet


Chemical Composition Limits
Weight% C Mn Si Cr Ni S P Mo Cu
ER 309
ER 309LMo
0.03 max 1.0-2.5 0.30-0.65 23-25 12-14 0.03 max 0.03 max 2-3 0.75 max

Alloy ER 309LMO is used for the welding of dissimilar materials between stainless and low alloy steels, as well as for overlay cladding. This alloy is well suited for austenitic ferritic joints with a maximum application temperature of 300ºC. It is also suited for stainless with wet corrosion up to 350ºC. Alloy 309LMO is also used for depositing buffer layers when welding clad products. ER309LMO can be used for joining unalloyed/low-alloy steels/cast steel grades or stainless/heat-resistance chromium steels/cast steel grades to austenitic steels/ cast steel grades.

Typical Mechanical Properties

Material Ultimate Tensile Strength Offset Yield Strength 0.2 % Elongation (%)
psi MPa psi MPa
ER 309/ ER 309LMo 89,900 620 63,800 440 42

Alloy ER 309/309LMo is a Stainless Steel TIG, MIG and SUB-ARC wire used for welding. For all stock availability contact Sales.

AWS 5.9
AWS ER 309/309LMo
UNS S30986

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Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.