ThePipingMart Blog Welding Electrodes AWS Class ENiCrMo-3 Welding Electrodes – Composition, Properties, and Uses

AWS Class ENiCrMo-3 Welding Electrodes – Composition, Properties, and Uses

AWS Class ENiCrMo-3

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 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.


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.

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