Best Alloy Materials Used in Industrial Hardfacing Applications: A Complete Guide for Wear Resistance and Equipment Life

Selecting the best alloy materials used in industrial hardfacing applications is one of the most important decisions in equipment remanufacturing and wear protection. Whether repairing mining tools, oil & gas valves, screw conveyors, crusher components, pipeline fittings, or steel mill equipment, the right hardfacing alloy directly determines service life, maintenance frequency, and overall operating costs.

At FNS Pipeline Technology Co., Ltd., we help customers select the optimum hardfacing alloy based on actual working conditions instead of simply choosing the hardest material. By combining advanced plasma transferred arc (PTA) cladding, laser cladding, automated welding systems, and application-specific alloy powders, FNS delivers durable metallurgical coatings that significantly extend component life while reducing total ownership costs.

Why Alloy Selection Matters in Industrial Hardfacing

Many equipment failures are caused not by inadequate structural strength but by gradual surface degradation.

Typical failure mechanisms include:

• Abrasive wear
• Sliding wear
• Metal-to-metal friction
• Impact wear
• Corrosion
• Erosion
• Cavitation
• High-temperature oxidation
• Thermal fatigue

Different wear mechanisms require different alloy systems. Selecting an unsuitable material often results in premature coating failure, cracking, excessive dilution, or unnecessary manufacturing costs.

The objective is not simply maximum hardness—it is achieving the best balance between:

• Wear resistance
• Toughness
• Corrosion resistance
• Heat resistance
• Crack resistance
• Machinability
• Cost efficiency

How to Select the Right Hardfacing Alloy

Professional engineers typically evaluate several factors before recommending a hardfacing solution.

Operating Environment

Questions include:

• Is the equipment exposed to sand or minerals?
• Is chemical corrosion present?
• Is seawater involved?
• Does the component operate above 600°C?
• Is there cavitation or slurry erosion?

These conditions determine the required alloy family.

Base Material Compatibility

The hardfacing alloy should match the thermal expansion characteristics of the substrate.

Typical substrates include:

• Carbon steel
• Low alloy steel
• Stainless steel
• Cast steel
• Tool steel
• Nickel alloys

Good compatibility minimizes residual stress and reduces cracking risks.

Required Surface Performance

Different applications prioritize different properties.

Examples include:

Application	Priority
Mining cutters	Extreme abrasion resistance
Valves	Corrosion + sealing performance
Screw shafts	Wear + anti-galling
Turbine components	Heat resistance
Pipe internal cladding	Corrosion resistance
Rollers	Impact + wear

Best Alloy Materials Used in Industrial Hardfacing Applications

1. Nickel-Based Alloys

Nickel alloys are among the most versatile hardfacing materials.

Typical grades include:

• Ni60
• Ni45
• Ni35
• Inconel 625
• Inconel 686
• Hastelloy series

Advantages

• Excellent corrosion resistance
• High-temperature stability
• Good crack resistance
• Excellent metallurgical bonding
• Suitable for plasma and laser cladding

Typical Applications

• Oil & gas valves
• Pipeline bore cladding
• Plastic extrusion screws
• Hydraulic cylinders
• Chemical equipment
• Pump components

2. Cobalt-Based Alloys (Stellite Series)

When high temperature combines with wear and corrosion, cobalt alloys remain an industry standard.

Common grades include:

• Stellite 6
• Stellite 12
• Stellite 21

Advantages

• Excellent hot hardness
• Outstanding galling resistance
• High oxidation resistance
• Superior cavitation resistance

Ideal Applications

• Valve seats
• Valve discs
• Steam turbine parts
• Pump sleeves
• Boiler components
• Nuclear equipment

3. Tungsten Carbide (WC) Reinforced Alloys

For severe abrasive environments, tungsten carbide remains one of the best choices.

WC particles can be incorporated into:

• Nickel-based matrices
• Cobalt-based matrices
• Iron-based matrices

Advantages

• Extremely high hardness
• Outstanding abrasion resistance
• Excellent particle erosion resistance

Applications

• TBM cutter rings
• Mining picks
• Drill tools
• Crusher hammers
• Agricultural machinery
• Wear plates

4. Iron-Based Hardfacing Alloys

Iron-based powders provide an economical solution for large components requiring moderate wear resistance.

Advantages include:

• Low material cost
• Good weldability
• High deposition efficiency
• Suitable for large-scale repair

Typical applications:

• Cement equipment
• Conveyor rollers
• Steel mill guides
• Agricultural machinery
• Bucket teeth

5. Chromium Carbide Alloys

Chromium-rich hardfacing alloys excel in abrasive wear combined with moderate corrosion.

Features include:

• High carbide content
• Good oxidation resistance
• Stable hardness
• Lower cost than WC systems

Applications:

• Fan impellers
• Cement screws
• Coal chutes
• Cyclones
• Ash handling systems

Alloy Comparison Table

Alloy	Wear Resistance	Corrosion Resistance	Heat Resistance	Typical Industry
Nickel-based	★★★★☆	★★★★★	★★★★☆	Oil & Gas
Stellite	★★★★☆	★★★★★	★★★★★	Valves
WC Composite	★★★★★	★★★☆☆	★★★★☆	Mining
Iron-based	★★★☆☆	★★☆☆☆	★★★☆☆	Heavy Industry
Chromium Carbide	★★★★☆	★★★☆☆	★★★★☆	Cement

How FNS Selects Alloy Materials

Rather than recommending a single alloy for every application, FNS engineers evaluate:

• Operating temperature
• Pressure
• Wear mechanism
• Corrosion media
• Base material
• Component geometry
• Service life targets
• Repair budget

Based on these factors, our engineering team develops customized hardfacing procedures using:

• PTA Plasma Cladding
• Laser Cladding
• Internal Bore Cladding
• Automated Hardfacing Systems
• Double Torch Internal Pipe Cladding
• Multi-axis Robotic Cladding

This engineering-based approach ensures each coating delivers the optimal balance of performance and cost.

FNS Project Example

Extending the Life of Plastic Extrusion Screws

A plastics manufacturer experienced frequent screw wear due to abrasive glass-fiber-filled polymers. Standard nitrided screws required replacement every eight months, resulting in costly downtime.

FNS evaluated the operating conditions and recommended a nickel-based alloy reinforced with tungsten carbide using an automated PTA cladding process. The optimized coating delivered:

• Significantly improved wear resistance
• Stable coating hardness
• Strong metallurgical bonding
• Minimal distortion after cladding
• Longer maintenance intervals
• Lower lifecycle costs

The solution extended screw service life by more than twice compared with the previous repair method, while reducing annual maintenance expenses and improving production uptime.

Why More Industries Choose Hardfacing Instead of Replacement

Replacing expensive industrial components is often unnecessary.

Modern hardfacing technology allows companies to:

• Restore original dimensions
• Improve wear resistance
• Upgrade corrosion performance
• Reduce material waste
• Lower spare-part inventory
• Support sustainable remanufacturing

For many components, remanufacturing costs only a fraction of purchasing new equipment while delivering equal or better surface performance.

Related Articles

To learn more about industrial hardfacing and remanufacturing, continue reading:

• Hardfacing Remanufacturing Process: Complete Guide from Surface Preparation to Final Machining
• Plasma Cladding Process vs Traditional Hardfacing: Which Is Better?
• How Hardfacing Remanufacturing Reduces Equipment Replacement Costs
• Laser Cladding vs Plasma Cladding: Choosing the Right Surface Engineering Solution

Frequently Asked Questions

Which alloy provides the highest wear resistance?

For severe abrasive wear, tungsten carbide reinforced alloys generally offer the highest hardness and wear resistance, making them ideal for mining tools, crusher components, and TBM cutters.

Is harder always better for hardfacing?

No. Excessive hardness can reduce toughness and increase the risk of cracking under impact loads. The optimal alloy depends on the specific wear mechanism and service conditions.

When should nickel-based alloys be selected?

Nickel-based alloys are recommended for environments involving corrosion, elevated temperatures, and combined wear, such as chemical processing, oil and gas, valves, and plastic processing equipment.

Why are Stellite alloys widely used on valves?

Stellite alloys provide excellent resistance to galling, cavitation, corrosion, and high temperatures while maintaining reliable sealing performance, making them a preferred choice for valve seats and sealing surfaces.

Can hardfacing be applied to worn components instead of replacing them?

Yes. Most industrial components with surface wear can be restored through hardfacing, provided the substrate remains structurally sound. This approach significantly reduces replacement costs and extends equipment service life.

What hardfacing technologies does FNS provide?

FNS offers a comprehensive range of surface engineering solutions, including PTA plasma cladding, laser cladding, internal bore cladding, robotic hardfacing, pipe end CRA cladding, and customized alloy development for industrial wear and corrosion protection.