Description
The ER420 3.2mm Sub Arc Wire 25kg is a high-hardness stainless steel welding wire, ideal for submerged arc welding (SAW) applications requiring excellent wear and abrasion resistance. Designed for welding martensitic stainless steels, this wire is often used in tooling, valve seats, turbine blades, and hard-facing jobs where high strength and durability matter most.
This wire contains high levels of chromium, which contributes to its impressive hardness and corrosion resistance. In addition, ER420 can be heat-treated after welding to further improve mechanical properties. It’s particularly useful in industries like power generation, mining, petrochemical, and pulp and paper, where equipment faces high impact or abrasive conditions.
The 3.2mm diameter offers great arc stability and smooth feed performance. It allows for consistent welds with clean bead appearance and minimal spatter. The 25kg spool size ensures extended welding runs, making it suitable for industrial-scale fabrication and reducing unnecessary downtime.
Unlike austenitic stainless wires, ER420 sub arc wire produces a martensitic weld deposit. Therefore, it’s important to follow proper preheating and post-weld heat treatment practices to reduce the risk of cracking. When used correctly, this wire delivers strong, reliable welds that last.
If you need a tough stainless solution for demanding welding projects, ER420 is a top-performing option. It works well on DC+ polarity and is compatible with common SAW equipment used in both manual and automated setups.
Find ER420 and other high-performance welding consumables at Fourie Welding & Tool. We proudly serve professionals across South Africa with fast delivery and reliable support.
For detailed alloy properties and best practices, see Lincoln Electric’s ER420 data sheet.
