When it comes to industrial applications, choosing the right materials is crucial. In situations that require optimal resistance to corrosion, high-temperature strength, and excellent weldability, the use of AWS Class ENiCrMo-3 is often the go-to solution. This blog post will dive deeper into AWS Class ENiCrMo-3, exploring its composition, physical and mechanical properties, uses, heat treatment, and corrosion resistance.
What is AWS Class ENiCrMo-3?
AWS Class ENiCrMo-3 welding electrodes is a metal alloy commonly used to produce welding electrodes. It is composed of nickel, chromium, molybdenum, and iron in a specific formulation designed to have high corrosion resistance and strength when welding. It is typically the most popular choice when joining steels with higher levels of yield strength, such as 9% Ni (ASTM A203) pressure vessel steel or low alloy steels. The superior corrosion and oxidation characteristics make it an ideal choice for various applications, including petrochemical processing equipment, nuclear vessels, and offshore structures. Because of its metallurgical compatibility, ENiCrMo-3 welding electrode can also be used as backup material on stainless steel alloys, such as types 304L/316L or 321/347.
ENiCrMo-3 Welding Electrodes Composition
AWS Class ENiCrMo-3 is a nickel alloy that contains high amounts of nickel, chromium, molybdenum, and other elements. It has a chemical composition shows high corrosion resistance, especially in acidic environments. The nickel content in this alloy provides excellent flexibility, while the chromium content enhances its ability to resist corrosion.
| C | Mn | Fe | P | S | Si | Cu | Ni | Al | Ti | Cr | Nb+Ta | Mo | Other |
| 0.1 | 0.5 | 5.0 | 0.02 | 0.015 | 0.5 | 0.5 | 58 | 0.4 | 0.4 | 20.0-23.0 | 3.15-4.15 | 8.0-10.0 | 0.5 |
ENiCrMo-3 Coated Electrodes Physical Properties
AWS Class ENiCrMo-3 weld wire has a density of 8.4 g/cm3 at room temperature, a melting point of 1300℃, and a coefficient of thermal expansion of 12.1 µm/mo℃. However, its most important physical property is its ability to maintain strength and toughness even at high temperatures, making it perfect for high-heat applications.
ENiCrMo-3 Welding Electrodes Mechanical Properties
AWS Class ENiCrMo-3 has excellent mechanical properties. It boasts a high tensile strength of more than 580 MPa, measuring its resistance to deformation under tension. It is also highly malleable, with more than 45% elongation values. The low thermal conductivity coefficients are worth mentioning, which is beneficial for resisting high-temperature oxidation and maintaining its strength at elevated temperatures.
| Tensile Strength | 115,000 psi |
| Yield Strength | 89,000 psi |
| Elongation | 34.5% |
ENiCrMo-3 Coated Welding Electrodes Trade Names
| Class | UNS | Oxford Alloys | Special Metals | BOHLER | UTP | ESAB | SANDVIK |
| ENiCrMo-3 | W86112 | Alloy 112 | INCONEL 112 | BOHLER FOX NIBAS 625 / THERMANIT 625 | UTP 6222 MO | OK NICRMO-3 | EXATON NICRMO-3 / SANICRO 60 / EXATON NI 60 |
ENiCrMo-3 Coated Electrodes Parameters
| Diameter | Process | Volt | Amps (flat) | Amps (V/OH) | |
| in | (mm) | ||||
| .035 | (0.9) | GMAW | 26-29 | 150-190 | Spray Transfer 100% Argon |
| .045 | (1.2) | GMAW | 28-32 | 180-220 | Spray Transfer 100% Argon |
| 1/16 | (1.6) | GMAW | 29-33 | 200-250 | Spray Transfer 100% Argon |
| 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 |
ENiCrMo-3 Welding Electrodes Uses
AWS Class ENiCrMo-3 has a vast range of industrial applications. It is often used in the petrochemical and oil & gas industries for high-temperature corrosive applications. Its resistance to stress corrosion cracking in chloride environments and caustic corrosion caused by oil synthesis is unmatched. It is also an excellent choice in marine applications, such as offshore drilling rigs or ship parts that experience seawater corrosion.
ENiCrMo-3 Welding Electrodes Heat Treatment
Heat treatment should be done with extreme care due to the alloy’s sensitive properties. AWS Class ENiCrMo-3 welding electrode is stable and resistant to precipitation and carbide formation at elevated temperatures during fabrication. The alloy can be welded without losing its mechanical properties and requires no further heat treatment.
ENiCrMo-3 Coated Electrodes Corrosion Resistant
AWS Class ENiCrMo-3 has excellent corrosion-resistant properties, making it highly sought after in the industry. This alloy is resistant to oxidation, sulfidation, and other forms of corrosion that arise from harsh environmental conditions such as high temperatures and acidic solutions. Its unique composition allows it to resist pitting and crevice corrosion even in seawater environments while maintaining excellent strength.
Conclusion
In conclusion, AWS Class ENiCrMo-3 is a versatile and formidable material with impeccable corrosion resistance and mechanical properties. Its superior performance and ease of use make it a top choice for applications across various industries, including petrochemical, marine, and offshore drilling. Choosing this alloy is a reliable and cost-effective solution to protect your machinery and ensure long-lasting service.
A passionate metal industry expert and blogger. With over 5 years of experience in the field, Palak brings a wealth of knowledge and insight to her writing. Whether discussing the latest trends in the metal industry or sharing tips, she is dedicated to helping others succeed in the metal industry.
