ESAB OK 67.70 (E309LMo-17) Stainless Steel Electrode
ESAB OK 67.70 is classified as E309LMo-17 under the AWS standard, which designates it as a stainless steel electrode containing molybdenum. The low carbon content (L grade) helps prevent carbide precipitation, improving the weld’s resistance to intergranular corrosion. This electrode is particularly suitable for joining dissimilar metals like stainless steel to mild or low-alloy steels and for buffer layer welding before applying corrosion-resistant stainless steel weld layers.
The molybdenum in the E309LMo-17 grade provides enhanced corrosion resistance, particularly against pitting and crevice corrosion in chloride-containing environments. This makes the OK 67.70 ideal for industrial applications where both strength and corrosion resistance are essential.
Key Features of ESAB OK 67.70 (E309LMo-17)
- Grade E309LMo-17: Provides a molybdenum-alloyed, low carbon stainless steel electrode for corrosion-resistant welding in demanding environments.
- Excellent Dissimilar Metal Welding: Ideal for welding stainless steel to carbon or low-alloy steels, ensuring strong, reliable joints.
- Buffer Layer Applications: Perfect for buffer layers on mild steel surfaces before applying corrosion-resistant stainless steel weld layers.
- Corrosion Resistance: Molybdenum increases resistance to pitting and crevice corrosion, even in chloride-rich environments.
- Acid Rutile Coating: Provides smooth weld finishes with excellent arc stability and minimal spatter.
- Industry Certifications: Approved by ABS, DNV-GL, BV, CE, ensuring compliance with key industry standards.
Applications
- Welding Dissimilar Metals: Joins stainless steel to carbon steel or low-alloyed steels for construction, fabrication, and repair.
- Buffer Layer Welding: Ideal for buffer layers when overlaying mild steel with corrosion-resistant stainless steel in chemical and petrochemical environments.
- Chemical Processing and Petrochemical Industries: Provides corrosion resistance for equipment exposed to aggressive chemicals and high temperatures.
- Industrial Fabrication: Suitable for structural applications in industries requiring resistance to corrosion and wear.
Specifications
| Feature | Details |
|---|---|
| AWS Classification | E309LMo-17 |
| Alloy Type | Austenitic CrNi with Mo |
| Ferrite Content | FN 12-22 |
| Yield Strength | 510 MPa |
| Tensile Strength | 610 MPa |
| Elongation | 32% |
| Impact Toughness (at 20°C) | 50 J |
| Typical Composition | 0.02% C, 13.4% Ni, 22.5% Cr, 2.8% Mo, 0.09% N |
Choose ESAB OK 67.70 (E309LMo-17) for high-performance dissimilar metal welding and buffer layer applications. Its excellent corrosion resistance and strong weld properties make it ideal for use in petrochemical, chemical processing, and general industrial fabrication.
Reference: manufacturer’s page.
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