50+ years of experience with providing wide area of specialty product services
Duroxite® Cr-free Wire
Hardfacing Wire, Welding Wire, Abrasion-Resistant Wire, Flux-Cored Wire, Wear-Resistant Wire, Hexavalent Chromium-Free Duroxite®Wire, Impact-Resistant Wire, Overlay Welding Wire, Wire for Hardfacing, Environmentally Safe Wire
Duroxite® Cr-free Wire is a non-chromium bearing flux-cored hardfacing wire for open arc welding. The deposited overlay contains boron carbides, offering wear resistance and hardness equal to or greater than conventional chromium carbide deposits. Duroxite® Cr-free Wire is specifically formulated to eliminate chromium in the welding wire, still providing outstanding wear resistance. Since no chromium alloys are added to the welding wire, the emission of hexavalent chromium during welding is significantly reduced or eliminated (depending on the chromium content in substrate materials or pre-existing weld deposit).
Duroxite® Cr-free Wire is an excellent choice of hardfacing wire for earthmoving applications when hexavalent chromium fumes are a major concern at the workshop. It is suitable for single and double-layer deposits. Preheating, interpass temperature, and post-weld heat treatment are applied according to base metal recommendations. If welding with downhill or uphill positions, reduced wire feed speed and voltage are preferred.
Key Benefits
- Duroxite® Cr-free Wire provides very good abrasion resistance for earthmoving applications where hexavalent chromium in welding fumes cannot be reduced by work practice controls.
- Duroxite® Cr-free Wire maintain same wear resistance guaranteed from surface through 75% depth of overlay in multi-layer deposit.
Typical Applications
Duroxite® Cr-free Wire is used for hardfacing components undergoing wear by earth, sand, and abrasives in industries such as agriculture, quarry, mining, and public works. Examples include mixer shafts, impellers, buckets, shovels, transport screws, and crushers for the concrete industry. As an impact-resistant wire and overlay welding wire, it delivers enhanced performance for demanding applications in harsh environments.
Standard Dimensions
| Standard diameter Metric |
|---|
| 1.6 mm |
| 2.8 mm |
Mechanical Properties
| Wear properties1) | ASTM G65 – Procedure A weight loss 2) | |||
|---|---|---|---|---|
| Number of overlay passes | Hardness: 2-layer deposit on mild steel | Hardness: 3-layer deposit on mild steel | Surface (g max) | 75% depth of overlay 3) (g max) |
| Multiple passes | 63 – 69 HRC | 65 – 69 HRC | 0.18 | 0.18 |
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.
Test results for mechanical properties
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.
Chemical Composition
| Typical all-weld metal analysis (Weight %) | |||||
|---|---|---|---|---|---|
| C (%) | Mn (%) | Si (%) | Ni (%) | B (%) | Fe |
| 0.5 | 2.0 | 1.2 | 1.7 | 4.0 | Balance |
Welding recommendations
| Welding conditions | ||
|---|---|---|
| Current type | Shielding gas | Welding positions |
| DCEP (Direct current electrode positive) | None (Self-shielded) | Flat, half up, half down |
Welding parameters recommendations
| Diameter (Metric) | Amperage (A) | Voltage (V) | Stick-out (mm) | |||
|---|---|---|---|---|---|---|
| Range | Optimum | Range | Optimum | Range | Optimum | |
| 1.6 mm | 225 – 300 | 270 | 20 – 26 | 23 | 15.9 – 25.0 | 20 |
| 2.8 mm | 290 – 310 | 300 | 29 – 31 | 30 | 15.9 – 25.0 | 20 |
Recovery: 95%
Delivery Conditions
| Standard Package | Diameter (Metric) | Weight (kg) |
|---|---|---|
| Spool | 1.6 mm | 15 |
| Spool | 2.8 mm | 25 |
Fabrication and Other Recommendations
The welded overlay components can be processed by welding, cutting, forming, and machining. For more detailed recommendations, refer to the Duroxite® Product brochure or consult your local technical support representative. Duroxite® Cr-free Wire is the ideal environmentally safe wire for those concerned about the health risks associated with hexavalent chromium fumes during welding. It is a Hexavalent Chromium-Free Duroxite® Wire, providing all the benefits of traditional welding wire without the environmental hazards of chromium emissions. This makes it a suitable choice for operators aiming to reduce hazardous welding fumes.