ZT818 Tungsten Cobalt Alloy for Twin Screw Extruder Barrel — ZHITIAN's Benchmark of Extreme Wear Resistance

1. Introduction: What Is ZT818 Alloy?

ZT818 is a tungsten-cobalt hard alloy independently developed by ZHITIAN for twin screw extruder barrels.
It combines 82% tungsten carbide (WC) and 18% cobalt (Co) through cold isostatic pressing (CIP) and precision sintering.
This alloy delivers ultra-high hardness HRA＞83(HRC 68–69), impact toughness ＞13 J/cm², and exceptional wear resistance, setting the industrial benchmark for high-load extrusion components.

2. Why ZT818 Is the Ultimate Wear-Resistant Alloy for Extruder Barrels

ZT818 stands as the pinnacle of wear-resistant materials, often referred to as the 'ceiling of metal-ceramic performance.'
Compared with traditional tool steel or cermet composites, it offers:

• Over 20× higher wear resistance than high-speed steel (6542)

• Excellent mechanical toughness for long-term extrusion operation

• Superior density and bonding strength from ZHITIAN’s advanced powder metallurgy process

• Outstanding thermal stability, maintaining hardness under high extrusion temperatures

These properties make ZT818 ideal for twin screw extruder barrel sleeves that require both extreme wear protection and dimensional precision.

3. Advanced Manufacturing Process

ZHITIAN applies a cold isostatic pressing and sintering process to achieve a dense and uniform microstructure in ZT818 alloy:

1. Powder Blending – 82% tungsten carbide mixed with 18% cobalt binder

2. CIP Molding – Uniform compression to eliminate internal porosity

3. Precision Sintering – Controlled atmosphere and temperature for full metallurgical bonding

4. Final Machining – CNC finishing ensures high dimensional accuracy for twin screw extruder barrel installation

This process guarantees both high mechanical strength and long-lasting surface stability under extreme wear conditions.

4. Applications of ZT818 in Twin Screw Extrusion

ZT818 is widely used in wear-critical extruder components, especially barrel sleeves for:

• Engineering plastics and glass-fiber compounds

• Wood-plastic composites (WPC)

• Masterbatch and filler compounding

• Flame-retardant and mineral-filled polymers

• Lithium battery electrode slurry production

In these sectors, ZT818 enables longer service life, stable extrusion quality, and reduced maintenance downtime.

5. Performance Data and Wear Test Results

Rubber Wheel Wear Test (10-Minute Standard Test)

Result:
ZT818's wear resistance is over 20 times greater than 6542, proving its unmatched durability for abrasive extrusion environments.

6. Why Choose ZHITIAN's ZT818 for Your Twin Screw Extruder

ZHITIAN's R&D team has achieved breakthroughs in powder metallurgy and hard alloy formulation, making ZT818 a flagship solution for the next generation of extrusion materials.
It outperforms traditional alloys in hardness, toughness, and thermal endurance, making it a top choice for customers seeking the longest-lasting extruder barrel solution.

7. Summary of Benefits

• Ultimate wear resistance under abrasive extrusion

• Over 20× longer lifespan than standard tool steels

• Maintains high precision and stability at elevated temperatures

• Metallurgical bonding ensures structural integrity

• Developed and produced by ZHITIAN, a leading manufacturer of twin screw extruder components