Chemical components

Product Description

ENiCrMo-4 is a high-performance nickel-chromium-molybdenum coated electrode conforming to AWS A5.11/A5.11M standards, specifically formulated for welding Hastelloy C-276 (UNS N10276) and other nickel-chromium-molybdenum alloys. Its all-position capability, combined with a nominal composition featuring high molybdenum (15.0-17.0wt.%) and chromium (14.5-16.5wt.%) with stringent impurity control (C≤0.02wt.%, Si≤0.08wt.%), delivers outstanding resistance to both oxidizing and reducing corrosive media. This electrode is ideal for joining nickel-chromium-molybdenum alloys, dissimilar welding (nickel alloys to carbon steel or stainless steel), and for corrosion-resistant overlays and cladding applications using Shielded Metal Arc Welding (SMAW).

Features

▪ Superior Corrosion Resistance: Provides exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC) induced by chlorides and harsh acidic environments. The optimized molybdenum and chromium content ensures robust performance against strong oxidizing acids like nitric and sulfuric acid, as well as reducing agents and mixed media containing chlorides or hydrogen sulfide.
▪ Stable and Reliable Performance: The extra-low carbon composition (C≤0.02%) effectively prevents intergranular carbide precipitation, preserving corrosion resistance in the as-welded condition without the need for post-weld heat treatment. The all-weld metal delivers high tensile strength (approximately 760-820 MPa), excellent ductility (elongation ≥28-35%), and maintains superior mechanical properties and toughness across a wide temperature range, closely matching the base metal.
▪ Excellent Weldability and Handling: Features a stable arc with a smooth, finely rippled bead profile and easy slag detachment. Designed for use with DC (+) polarity, it offers good operability in all positions (except vertical down). It provides a self-shielding slag system suitable for welding in normal to moderate temperature conditions, with recommended preheat and interpass temperature control (typically below 120°C) to ensure optimal properties, especially for thick sections or restrained joints.

Applications

▪ Specifically developed for fabricating equipment exposed to the most severe corrosive conditions, ENiCrMo-4 is essential in:
▪ Chemical Processing: Construction and repair of reactors, piping, heat exchangers, and storage tanks handling highly corrosive chemicals, including those in flue gas desulfurization (FGD) systems and pickling operations.
▪ Oil & Gas and Offshore Industries: Welding of components for sour gas service, seawater handling systems, and process equipment on offshore platforms requiring resistance to sulfide stress cracking.
▪ Power Generation and Marine: Fabrication and cladding of pollution control equipment, seawater cooled heat exchangers, and for welding 9% nickel steel in LNG storage tanks due to its compatible thermal expansion and toughness.
▪ Maintenance and Cladding: Ideal for overlay welding to provide corrosion-resistant surfaces on less noble metals like carbon or low-alloy steel, and for joining dissimilar metal combinations in general fabrication where high corrosion resistance is paramount.