The Carbide Tube Rod is a composite welding material designed for hardfacing applications.
It is made by wrapping a low-carbon steel strip around precisely graded tungsten carbide pellets (or crushed particles), forming a tubular structure through rolling and welding.
This unique design combines a high-hardness wear-resistant core with a ductile steel carrier, delivering both excellent durability and reliable weldability.
Features
High Hardness & Excellent Wear Resistance: Hardfaced layers typically reach HRC 60–63 (≈1300–1500 HV), providing outstanding abrasion resistance in severe wear conditions.
Strong Metallurgical Bond: The low-carbon steel carrier ensures excellent bonding and impact resistance, reducing cracking or delamination.
Good Weldability: Suitable for oxy-acetylene flame hardfacing, requiring no post-heat treatment while maintaining uniform and dense weld deposits.
Corrosion & Thermal Stability: WC remains stable in neutral or mildly acidic environments, and hardness retention exceeds 90% below 300°C.
Grade & Chemical Composition
| Grade | Hard-phase | Bonding-phase |
| 38D62 | Cemented carbide pellet, etc. | Low-carbon steel |
Hard Phase: Mainly composed of tungsten carbide (WC) or WC–Co alloy pellets, uniformly distributed within the tube to create a dense, highly wear-resistant surface.
Bonding-phase: The low-carbon steel strip acts as the bonding layer, melting during welding and forming a strong metallurgical bond with the base metal.
Typical Specifications
| Grade | Diameter
(mm) |
Length
(mm) |
Hardness
(HRC) |
Recommended Application |
| 38D6219A | φ3.2 | 600 | HRC≥60 | Precision parts (gauge pads, valve seats) |
| 38D6211B | φ4 | 600 | HRC≥60 | General hardfacing (bucket teeth, jaw plates) |
| 38D6211C | φ5 | 600 | HRC≥60 | Large-area overlay or base layer (rollers, drill tools) |
Application Scenarios
The carbide tube rod is widely used for surface hardfacing of components that operate under heavy wear or impact conditions, including:
Oil & Gas Industry: Hardfacing of PDC drill bit gauge pads, tricone bit palms, and drill pipe joints.
Construction & Mining Equipment: Excavator bucket teeth, crusher jaw plates, and wear liners.
Metallurgy & Power Generation: Pulverizer rollers, fan impellers, and guide plates exposed to erosive abrasion.
Repair and Maintenance: Valve seats, die edges, and manifold connections requiring localized reinforcement.
Compared with solid welding rods, carbide tube rods significantly extend service life and reduce maintenance or replacement costs.
