ThePipingMart Blog Welding Electrodes AWS Class ERNiCrCoMo-1 Filler Metal – Composition, Properties, and Uses

AWS Class ERNiCrCoMo-1 Filler Metal – Composition, Properties, and Uses

AWS Class ERNiCrCoMo-1

Choosing the right filler metal is crucial in welding the desired result. One of the options available in AWS Class ERNiCrCoMo-1. This alloy is widely used for welding exotic metals such as nickel alloys and stainless steels. This blog post will examine AWS Class ERNiCrCoMo-1’s composition, physical and mechanical properties, uses, heat treatment, and corrosion resistance.

What is AWS Class ERNiCrCoMo-1 Filler Metal?

AWS Class ERNiCrCoMo-1 filler metal alloy is a chromium-molybdenum (CrMo) alloy steel used for welding applications. It has excellent strength and toughness at elevated temperatures and good oxidation resistance. This welding electrode material typically contains 5 to 10 per cent chromium and 0.2 to 0.7 per cent molybdenum in its chemical composition, with the remainder being iron and carbon. The higher levels of chromium content give it better corrosion resistance. In contrast, the molybdenum gives increased hardness at elevated temperatures that make it suitable for welding applications on components operating at elevated temperatures, such as boilers, pressure vessels, piping systems etc., where traditional carbon steels would suffer from embrittlement or other issues due to their limited temperature range capabilities.

ERNiCrCoMo-1 Welding Alloy Composition

AWS Class ERNiCrCoMo-1 welding electrode  is a nickel-based alloy that contains approximately 62% nickel, 21% chromium, 9% molybdenum, 5% cobalt, and small amounts of other elements such as iron, manganese, and silicon. The high nickel content makes it suitable for welding nickel alloys and stainless steel.

C Mn Si Cr S P Ni Fe Cu Al Mo Co Ti
0.05-0.15 ≤1.0 ≤1.0 20-24 ≤0.015 ≤0.03 Rest ≤3.0 ≤0.5 0.8-1.5 8-10 10-15 ≤0.6

ERNiCrCoMo-1 Filler Metal Physical Properties

AWS Class ERNiCrCoMo-1 has a melting point range of 1290 to 1350°C (2350-2460°F). It is a highly ductile and malleable alloy that can easily form or shape without cracking or breaking. It has a density of 8.52 g/cm3 and a specific heat capacity of 438 J/kg·K.

ERNiCrCoMo-1 Coated Electrode Mechanical Properties

The mechanical properties of AWS Class ERNiCrCoMo-1 filler wire depend on various factors, such as the welding process, the base material, and the heat treatment. It generally has good tensile strength, high yield strength, and excellent creep resistance. It can also withstand high-pressure and temperature environments.

Tensile Strength MPa(ksi) Yield Strength MPa(ksi) Elongation %
AWS requirement 620(90) Not specified Not specified
Typical results as welded 770(112) 610(89) 28

ERNiCrCoMo-1 Welding Alloy Trade Names

Class UNS Oxford Alloys Special Metals BOHLER UTP
ERNiCrCoMo-1 N06617 Alloy 617 INCONEL FILLER METAL 617 THERMANIT 617 UTP A 6170 CO

ERNiCrCoMo-1 Coated Electrode Parameters

Diameter Process Volt Amps Shielding Gas
In mm
0.035 0.9 GMAW 26-29 150-190 Spray Transfer 100% Argon
0.045 1.2 GMAW 28-32 180-220
1/16 1.6 GMAW 29-33 200-250
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

ERNiCrCoMo-1 Filler Metal Uses

AWS Class ERNiCrCoMo-1 filler wire is commonly used in the aerospace, chemical, and petrochemical industries. It is used for welding and repairing superalloys, nickel alloys, and stainless steel in high-temperature applications. It also manufactures gas turbine components, heat exchangers, and pressure vessels.

ERNiCrCoMo-1 Welding Alloy Heat Treatment

AWS Class ERNiCrCoMo-1 coated rod can be heat treated to improve its mechanical properties. The process involves heating the material to a specific temperature range, and holding it for a specific time, followed by quenching or air cooling. Heat treatment can improve the alloy’s strength, flexibility, and toughness.

ERNiCrCoMo-1 Coated Electrode Corrosion Resistance

AWS Class ERNiCrCoMo-1 welding rod has excellent corrosion resistance to various environments, including oxidizing and reducing media. It is resistant to pitting, crevice corrosion, and stress corrosion cracking. Its high nickel and molybdenum content makes it resistant to chloride-induced stress corrosion cracking.


AWS Class ERNiCrCoMo-1 filler metal alloy is a nickel-based alloy widely used for welding exotic metals such as nickel alloys and stainless steel. Its unique physical and mechanical composition suits high-temperature and high-pressure environments. Its ability to withstand various types of corrosion makes it a popular choice for many industries. AWS Class ERNiCrCoMo-1 can improve strength, flexibility, and toughness with proper heat treatment. In summary, AWS Class ERNiCrCoMo-1 is a versatile and reliable alloy that has proven its worth in various applications.

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