AWS Class ERNiCrMo-3 is a popular welding wire used in various chemical, petrochemical, and offshore industries. It is a nickel-based alloy that offers superior resistance to harsh environments and high-temperature applications. In this blog post, we will dive into the world of AWS Class ERNiCrMo-3 and explore its composition, properties, uses, heat treatment and corrosive resistance.
What is AWS Class ERNiCrMo-3 Welding Electrode?
AWS ERNiCrMo-3, alloy 625 or UNS N06625, a welding alloy is a nickel-chromium-molybdenum alloy resistant to corrosion and high temperatures. It is commonly used in applications where resistance to general corrosion, pitting, and crevice corrosion are important. It also has good elevated temperature strength, excellent oxidation resistance up to 2100°F (1100°C), and outstanding weldability properties. When exposed to extreme temperatures between -300°F (-185 °C)–2000°F (1093 °C), the material remains strong yet pliable. It can be machined in either the annealed or normalized condition due to its ease of machinability. Alloy 625 is often used in industries such as automotive and aerospace for components like exhaust systems and turbine blades, respectively, due to its ability to resist stress cracking when exposed to hydrogen sulfide gas, chloride brines or salty atmospheres with low concentrations of chlorine salts.
ERNiCrMo-3 Coated Electrode Composition
AWS Class ERNiCrMo-3 welding wire is a nickel-based alloy that contains predominantly nickel, with significant amounts of chromium, molybdenum, and other elements. The exact composition of AWS Class ERNiCrMo-3 varies depending on the manufacturer, but typical amounts of the alloy include 60-70% Nickel, 19-22% Chromium, 14-16% Molybdenum, and 2-3% Other elements. The precise composition of the alloy influences its properties, including its mechanical strength, flexibility and overall corrosion resistance.
| 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 |
ERNiCrMo-3 Welding Electrode Physical Properties
AWS Class ERNiCrMo-3 welding rod is a corrosion-resistant alloy that offers high-temperature strength. Its density is approximately 8.4 grams per cubic meter, an electrical conductivity of 0.12 Mega Siemens per meter, and a thermal conductivity of 15.9 watts per meter-Kelvin. These physical properties make it ideal for high-performance applications in harsh and demanding environments.
ERNiCrMo-3 Weld Wire Mechanical Properties
The mechanical properties of AWS Class ERNiCrMo-3 coated electrode depend on factors such as temperature, welding process, and heat treatment. It generally has good tensile strength, with yield strength ranging from 450 to 620 megapascals (MPa) and ultimate tensile strength from 750 to 950 MPa. The elongation of the alloy ranges from 25 to 35%, making it a ductile material. It is important to note that the mechanical properties of the alloy can be enhanced by applying specific heat treatment procedures.
| Tensile Strength | 114,000 psi |
| Yield Strength | 66,000 psi |
| Elongation | 35% |
ERNiCrMo-3 Coated Electrode Trade Names
| Class | UNS | Oxford Alloys | Special Metals | SANDVIK | BOHLER | UTP | ESAB |
| ERNiCrMo-3 | N06625 | Alloy 625 | INCONEL FILLER METAL 625 | EXATON NI 60 | BOHLER THERMANIT 625 | UTP A 6222 | OK AUTROD NICRMO-3 |
ERNiCrMo-3 Welding Electrode 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 |
ERNiCrMo-3 Welding Electrode Uses
AWS Class ERNiCrMo-3 welding wire is used in a wide range of industries, but it is primarily used in chemical processing and petrochemical plants. It is also popular for offshore applications, exposed to high humidity, harsh chemicals and corrosive saltwater. It is typically used to weld high-nickel alloys, stainless steel, and certain nickel alloys. It has been used to manufacture heat exchangers, insulation blankets, and reactor vessels.
ERNiCrMo-3 Coated Electrode Heat Treatment
The properties of AWS Class ERNiCrMo-3 welding alloy can be improved by subjecting it to specific heat treatment processes. The annealing process can improve flexibility and toughness, whereas solution heat and precipitation treatment can improve strength and hardness. Depending on the desired mechanical and physical properties, the alloy can be heat treated at various temperatures and cooling rates.
ERNiCrMo-3 Welding Electrode Corrosion Resistance
AWS Class ERNiCrMo-3 coated rod offers excellent resistance to various corrosive environments, including nitric acid, sulfuric acid, and chloride-induced stress corrosion cracking. It also offers exceptional resistance to pitting and crevice corrosion. This makes it ideal for harsh and corrosive environments where other materials may fail.
Conclusion
In conclusion, AWS Class ERNiCrMo-3 welding electrode is a versatile nickel-based alloy with exceptional resistance to harsh environments and high-temperature applications. It’s unique composition and physical properties make it an ideal choice for the chemical, petrochemical, and offshore industry. By understanding its composition, physical and mechanical properties, uses, heat treatment and resistance to corrosion, we can appreciate its value and importance in various industrial applications.
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.
