Duroxite® 300 Wire
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Duroxite® 300 Wire is a flux-cored welding wire for hardfacing components subject to extremely severe sliding wear applications using an open-arc or gas shielded arc welding processes. The weld deposit of Duroxite® 300 Wire consists of specially formulated abrasive materials employing a uniform glass-forming melt chemistry that allows high undercooling to be achieved. Duroxite® 300 weld overlay contains a unique high volume of ultra-fine tungsten-niobium-molybdenum-rich complex borocarbide phase with a grain size refined down to 500 nm. The borocarbides are completely wetted in a ductile matrix preventing premature pull-out delamination, crack nucleation and bridging. This results in a product with significantly improved service life that maintains high toughness in severe sliding wear applications.
Duroxite® 300 Wire is suitable for single or double-layer deposit with both stringer and oscillation beads. It naturally reveals stress-relief cracks after welding. Preheating, inter-pass temperature, and post-weld heat treatment are as needed according to the base metal recommendations. If welding fume generation is a concern, a gas shielded arc welding process is recommended. A slight drag angle is preferred for better performance while welding. If welding with downhill or uphill positions, reduced wire feed speed and voltage are preferred. Duroxite® 300 Wire is designed to weld on carbon steel or low alloy steel substrates experiencing severe wear for both dry and wet (slurry) abrasive environments at ambient or elevated temperatures up to 600°C (1100°F). Duroxite® 300 Wire is not compatible with austenitic alloys. Duroxite® 300 Wire is an excellent alternative to tungsten carbide hardfacing wire.
Typical Applications
Duroxite® 300 Wire is mainly designed to use for hardfacing any steel substrates (not compatible with austenitic alloys) undergoing extremely severe wear in mining, power generation, cement, oil sand, steel production, waste handling, and pulp and paper industries. Typical examples include:
1) Surface hardness is measured on machined flat surface just below overlay surface.
2) ASTM G65 is a standard test measuring sliding abrasion resistance using a dry sand/rubber wheel apparatus. ASTM G65-Procedure A is the most severe test method.
3) ASTM G65 wear test is conducted at 75% depth of the overlay materials to ensure consistently good wear resistance from the top surface through to the depth of 75% of the overlay.
4) Duroxite 300 outperforms typical CCO in an SJE test. Typical CCO loses 0.0689 g at 20° and 0.0995 g at 45° impingement angles in the same test. For more information about Duroxite® 300 and its performance in a Slurry Jet Erosion Test, please see the Duroxite® Brochure – The Latest in Overlay Technology available at ssab.com.
Test results for mechanical properties, deposit overlay chemical composition, surface hardness, and ASTM G65-A weight loss were obtained from a weld produced and tested according to prescribed standards, and should not be assumed to be the expected results in a particular application or weldment. Actual results will vary depending on many factors, including, but not limited to, weld procedure, substrate chemistry and working temperature, weldment design and fabrication methods. Users are cautioned to confirm by qualification testing, or other appropriate means, the suitability of any welding consumable and procedure before use in the intended applications.
Recovery: 90%
The welded overlay components can be processed by welding, cutting, forming and machining. Specific recommendations can be found in the Duroxite® Product brochure or by consulting your local technical support representative.
When welding or cutting Duroxite® products, gases and harmful fumes are produced that are chemically complex and difficult to classify. The major toxic component in the fumes is hexavalent chromium. The proper exhaust ventilation equipment and fume-extraction torches are recommended, as well as suitable protective clothing and respiratory protection for operators.