AWS Class ENiCrMo-4 is a nickel-chromium-molybdenum alloy that finds application in various industries. This alloy provides excellent resistance to high-temperature corrosion and oxidation, making it an ideal choice in extreme environments. This blog post will look at the AWS Class ENiCrMo-4 in-depth, including its composition, physical and mechanical properties, heat treatment, corrosion resistance, and common uses.
What is AWS Class ENiCrMo-4?
AWS Class ENiCrMo-4 welding electrode is an alloy of nickel, chromium, and molybdenum (NiCrMo), making it a corrosion-resistant material with excellent strength and flexibility. It has a heat resistance of up to 1350°C and offers unique fatigue properties at elevated temperatures. The alloy is also highly resistant to environmental cracking and displays good mechanical properties when subject to weldability or preheating requirements. As such, it’s frequently used in components operating in environments where high temperatures are encountered, or heavy loads are applied. Its main applications include gas turbine components, boiler tubes, bolting materials for nuclear reactors, and castings for petrochemical industries.
ENiCrMo-4 Coated Electrode Composition
AWS Class ENiCrMo-4 coated electrode is a nickel-chromium-molybdenum alloy with excellent high-temperature strength and resistance to corrosion and oxidation. Some of the primary elements in the composition of this alloy include 15-17% chromium, 15-17% nickel, and 4-6% molybdenum. Other elements in ENiCrMo-4 include tungsten, iron, manganese, carbon, alumina, titanium, and boron. Upon mixing, all these elements combine to form a material that can withstand high heat levels and extreme conditions, hence its suitability for industrial applications.
| C | Mn | Fe | P | S | Si | Cu | Ni | Co | Cr | Mo | V | W | Other |
| 0.02 | 1.0 | 4.0-7.0 | 0.04 | 0.03 | 0.2 | 0.50 | Remainder | 2.5 | 14.5-16.5 | 15.0-17.0 | 0.35 | 3.0-4.5 | 0.50 |
ENiCrMo-4 Coated Electrode Physical Properties
AWS Class ENiCrMo-4 coated electrode has unique physical properties, making it a valuable alloy for various industries. This alloy exhibits excellent resistance to corrosion, oxidation, and high-temperature creep deformation. Additionally, it has good weldability, machinability, and ductility, making it easy to manufacture and use in a wide range of applications. The high-temperature mechanical properties of ENiCrMo-4 are impressive, with a melting point of 1330°C, tensile strength of 620 MPa, and ultimate strength of 675 MPa.
ENiCrMo-4 Coated Electrode Mechanical Properties
Mechanical properties refer to the material’s ability to resist deformation and withstand mechanical stress without breaking down. AWS Class ENiCrMo-4 welding electrode has excellent mechanical properties, such as high tensile and yield strength. The tensile strength of this alloy is 620 MPa, while the yield strength is 280 MPa. It is also important to note that ENiCrMo-4 has high hardness levels, making it suitable for applications requiring high wear resistance.
| UTS | Elongation |
| (MPa) | (L= 4d)% |
| 720 | 28.0 |
ENiCrMo-4 Coated Electrode Parameters
| Diameter | Process | Volt | Amps (flat) | Amps (V/OH) | |
| in | (mm) | ||||
| 3/32 | (2.4) | SMAW | 24-28 | 70-85 | 65-75 |
| 1/8 | (3.2) | SMAW | 26-30 | 85-110 | 80-90 |
| 5/32 | (4.0) | SMAW | 28-32 | 110-140 | 100-120 |
| 3/16 | (4.8) | SMAW | 28-32 | 120-160 | 110-130 |
ENiCrMo-4 Trade Names
| Class | UNS | Oxford Alloys | Special Metals | SANDVIK | UTP |
| ENiCrMo-4 | W80276 | Alloy C-276 | Incoweld C 276 | EXATON NICRMO-4 / EXATON NI 56 | UTP 776 KB |
ENiCrMo-4 Welding Electrode Uses
AWS Class ENiCrMo-4 welding electrode finds application in various industries, such as aerospace, gas turbines, chemical processing, and nuclear power plants. It is used in manufacturing gas turbine components such as turbine blades and discs, combustion chamber parts, and heat shield components. The alloy is also used in aerospace manufacturing aircraft engine components and exhaust systems. In the chemical processing industry, ENiCrMo-4 is used to manufacture process equipment that comes into contact with high-temperature corrosive environments.
ENiCrMo-4 Welding Electrode Heat Treatment
The heat treatment of ENiCrMo-4 coated electrode involves annealing or solution treatment. The alloy can be heated to 950°C and quenched in water or air. This process relieves the residual stresses caused by welding or cold working and restores the alloy’s mechanical properties. The heat treatment process also improves the alloy’s weldability and increases its resistance to corrosion.
ENiCrMo-4 Welding Electrode Corrosion Resistance
One of the most significant advantages of AWS Class ENiCrMo-4 is its corrosion resistance. This alloy can withstand harsh environments, including high temperatures, oxidation, and corrosive gases. It can resist stress corrosion cracking, pitting, and crevice corrosion, making it ideal for chemical processing, nuclear power plants, and oil and gas applications.
Conclusion
AWS Class ENiCrMo-4 is a unique nickel-chromium-molybdenum alloy with excellent high-temperature strength and resistance to corrosion and oxidation. Its unique combination of physical properties, mechanical properties, and corrosion resistance makes it an ideal material for various industrial sectors. ENiCrMo-4’s uses range from gas turbines to aerospace, chemical processing, and nuclear power plants. This alloy’s heat treatment and corrosion-resistant properties enhance its mechanical properties and extend its service life, making it an ideal choice for extreme environments.
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.
