ER309L Welding Wire Supplier for 309/309L/Dissimilar Metal Welding
ER309L is a low-carbon austenitic stainless steel welding wire designed for welding 309 and 309L stainless steels. It is particularly effective in dissimilar metal welding, such as welding stainless steels to carbon steels or low alloy steels. The low carbon content reduces the risk of intergranular corrosion, making ER309L suitable for applications where corrosion resistance and mechanical strength are critical.
ER309L is widely used in the power generation, chemical processing, automotive, and food processing industries where welds are exposed to moderately corrosive environments.
Need ER309L welding wire for your project? Contact us for specifications, MTC, availability, and a competitive quotation.
ER309L
ER309L
ER309L
| Standard | Classification |
|---|---|
| AWS A5.9 | ER309L |
| EN ISO 14343-A | G 23 12 L / W 23 12 L |
| UNS | S30908 |
|
Element |
C |
Mn |
Si |
Cr |
Ni |
P |
S |
Fe |
|
Content (%) |
≤0.03 |
1.0–2.5 |
≤0.75 |
23.0–25.0 |
12.0–14.0 |
≤0.03 |
≤0.03 |
Balance |
Actual composition is subject to the applicable product specification and production requirements. Mill Test Certificates can be provided upon request.
|
Property |
Value |
|
Tensile Strength |
≥550 MPa |
|
Yield Strength |
≥220 MPa |
|
Elongation |
≥30% |
|
Impact Toughness |
Good at room temperature |
These mechanical properties ensure ER309L can withstand moderate thermal cycles, making it suitable for dissimilar metal welding.
ER309L is widely selected for joining stainless steel to carbon steel or low-alloy steel, making it a practical filler metal for dissimilar-metal fabrication.
The relatively high Cr and Ni content provides good resistance to oxidation and moderate corrosion, particularly in elevated-temperature service.
The low carbon level helps reduce chromium carbide precipitation and the associated risk of intergranular corrosion.
ER309L offers stable welding performance and is suitable for both MIG/GMAW and TIG/GTAW welding.
| Feature | ER308L | ER309L |
|---|---|---|
| Main Application | 304/304L stainless steel | 309/309L stainless steel & dissimilar welding |
| Cr Content | Lower | Higher |
| Ni Content | Lower | Higher |
| Stainless-to-Carbon Steel | Generally not preferred | Commonly used |
| Oxidation Resistance | Good | Higher |
For 304/304L stainless steel, ER308L is generally the standard choice. For 309/309L stainless steel or stainless steel-to-carbon/low-alloy steel welding, ER309L is generally more suitable.
| Category | Details |
|---|---|
| Base Materials | 309, 309L stainless steel; stainless steel-to-carbon steel; stainless steel-to-low-alloy steel |
| Welding Processes | GMAW (MIG/MAG), GTAW (TIG) |
| Industrial Applications | Piping and pressure equipment, chemical processing equipment, power generation, automotive exhaust systems, general stainless steel fabrication |
| Service Environment | Elevated temperatures, oxidation exposure, and moderately corrosive environments |
| Available Forms | MIG welding wire and TIG filler rod |
| Supply Options | Various diameters, spool or rod packaging, MTC and project-specific requirements |
1. What is ER309L welding wire?
ER309L is a low-carbon austenitic stainless steel welding wire classified under AWS A5.9. It is mainly used for 309/309L stainless steel and dissimilar metal welding.
2. What is ER309L used for?
ER309L is commonly used for stainless steel-to-carbon steel welding, stainless steel-to-low-alloy steel welding, 309/309L stainless steel fabrication, piping, pressure equipment, and high-temperature applications.
3. Can ER309L be used for TIG welding?
Yes. ER309L is available as a TIG filler rod for GTAW welding as well as solid wire for GMAW/MIG welding.
4. Can ER309L be used for MIG welding?
Yes. ER309L MIG wire is widely used for GMAW stainless steel and dissimilar-metal welding.
5. What information is needed for an ER309L quotation?
Please provide the required diameter, quantity, welding process, packaging, destination, and any certification requirements. For project-specific applications, the base-metal grades are also helpful.
Need ER309L welding wire for your project? Contact us for pricing, availability, specifications, and MTC. Send us your required diameter, quantity, and destination for a quotation.
📧 Email: support@ronsteel.com
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