The world of welding and metal fabrication is vast and diverse, and to understand it fully, you need to know about different alloys and their properties. One such material that gained popularity recently is Alloy 309LMo MIG & TIG. While welding, professionals use these filler metals to bond two metal pieces, making them stronger. This blog post will discuss the composition, properties, uses, heat treatment, and corrosion resistance of Alloy 309LMo MIG & TIG to help you understand this alloy better.
What is Alloy 309LMo MIG & TIG?
Alloy 309LMo MIG & TIG is an austenitic stainless steel containing a high level of chromium and molybdenum. It provides excellent corrosion resistance, making it highly suitable for welding applications in exposure to corrosive environments. Compared to the standard Alloy 309, this variant contains a higher content of molybdenum to further improve its corrosion-resistant properties and temperature strength. It can be used for welding and cladding heavy plate components such as chemical tanks, boilers, exhaust stacks, furnace parts, heat exchangers, etc. Its strength, durability and ease of use make Alloy 309LMo MIG & TIG an ideal choice for many industrial applications.
Alloy 309LMo MIG & TIG Welding Coated Composition
Alloy 309LMo MIG & TIG is a filler material that mostly comprises iron, nickel, and chromium. This mixture makes the alloy highly weldable and offers exceptional thermal stress cracking resistance. In addition, it also contains molybdenum, which significantly enhances its pitting and crevice corrosion resistance and overall mechanical properties. Moreover, it’s essential to mention that the low percentage of carbon in Alloy 309LMo MIG & TIG reduces the chance of carbide precipitation and sensitization during welding.
| C | Mn | Si | Cr | Ni | S | P | Mo | Cu |
| 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 309LMo MIG & TIG Welding Wire Physical Properties
The real physical properties of welding Alloy 309LMo MIG & TIG depend on several factors, such as the welding method, heat treatment, and metal thickness. However, the general physical characteristics include high tensile strength, good elongation, low thermal expansion, and excellent resistance to oxidation up to 1038 degrees Celsius.
Alloy 309LMo MIG & TIG Welding Coated Mechanical Properties
Alloy 309LMo MIG & TIG’s coated electrode mechanical properties vary based on the welding process, heat treatment, and base metal chosen. It generally has excellent toughness and is suitable for welding on dissimilar metals. Additionally, it possesses superior creep and rupture strength, making it a popular choice for high-temperature applications. Other mechanical properties of this alloy include good bending fatigue strength, high impact resistance, and low magnetic permeability.
| Tensile Strength (psi) | 86,000 psi (593 MPa) |
|---|---|
| Yield Strength (psi) | 57,000 psi (393 MPa) |
| Elongation (%) | 42% |
Alloy 309LMo MIG & TIG Welding Wire Trade Name
| Class | Oxford Alloys | BOHLER |
| 309LMo | Alloy 309LMo | BOHLER CN 23/12 MO |
Alloy 309LMo MIG & TIG Welding Coated Parameters
|
Diameter |
Process |
Volt |
Amps |
Shielding Gas | |
| in |
(mm) |
||||
| .035 |
0.9 |
GMAW |
22-23 |
180-210 | Spray Transfer 98% Argon / 2% Oxygen |
| .045 |
1.2 |
GMAW |
23-25 |
195-260 | |
| 1/16 |
1.6 |
GMAW |
25-28 |
260-390 | |
| .035 |
0.9 |
GMAW |
19-23 |
55-170 |
Short Circuiting Transfer |
| .045 |
1.2 |
GMAW |
19-23 |
100-185 | |
| 1/16 |
1.6 |
GMAW |
|||
| 1/16 |
1.6 |
GTAW |
14-18 |
90-130 |
100% Argon |
| 3/32 |
2.4 |
GTAW |
15-20 |
120-175 |
100% Argon |
| 1/8 |
3.2 |
GTAW |
15-20 |
150-220 |
100% Argon |
Alloy 309LMo MIG & TIG Welding Wire Uses
Alloy 309LMo MIG & TIG welding electrode is commonly used in the oil and gas, chemical processing, food processing, power generation, and pulp and paper industries. It is an excellent choice for welding stainless, duplex, and super duplex steels, welding thin gauge materials, and joining metal pieces with different compositions. In addition, the corrosion-resistant properties of this alloy make it a preferred choice for environments where pitting and crevice corrosion are significant concerns.
Alloy 309LMo MIG & TIG Welding Coated Heat Treatment
Proper heat treatment is crucial when welding with Alloy 309LMo MIG & TIG. The heat treatment process involves annealing the steel at a temperature of 1950-2100°F, followed by rapid quenching in water or air. This process eliminates the chance of carbide precipitation and sensitization during welding, improving the alloy’s weldability.
Alloy 309LMo MIG & TIG Welding Wire Corrosion Resistant
One of the most significant benefits of Alloy 309LMo MIG & TIG is its excellent corrosion-resistant properties. This material offers exceptional pitting and crevice corrosion resistance in highly aggressive environments like seawater, acidic solutions, and chloride-rich atmospheres. Moreover, adding molybdenum enhances its general corrosion resistance, making it suitable for outdoor applications.
Conclusion:
Alloy 309LMo MIG & TIG has become increasingly popular due to its exceptional mechanical and corrosion-resistant properties. Professionals can weld this alloy efficiently with the right welding methods and heat treatment. Its corrosion-resistant properties make it a preferred choice for various industries, including oil and gas, food processing, and power generation. This comprehensive guide should give you all the necessary information you need to know about Alloy 309LMo MIG & TIG to make informed decisions when working with this alloy.
Abhishek is a seasoned blogger and industry expert, sharing his insights and knowledge on various topics. With his research, Abhishek offers valuable insights and tips for professionals and enthusiasts. Follow him for expert advice on the latest trends and developments in the metal industry.
