Carbide grades
Rings are made of tungsten carbide (WC) grains in a metal binder. Cobalt binder grades are the standard; cobalt-nickel-chromium binder grades resist corrosion from cooling water better. Lower binder content gives higher hardness and wear life for the last finishing passes; higher binder content gives the toughness needed in pre-finishing and higher-load passes.
Where carbide rings are used
- No-twist finishing and pre-finishing blocks of wire rod mills
- Reducing and sizing blocks, including 3-roll stands
- Pinch rolls before the laying head
- Rebar finishing passes and composite carbide rolls
Getting more tons per groove
Carbide life depends on cooling water quality and volume, correct groove regrinding and careful handling — carbide is hard but brittle. We give grade, cooling and regrind recommendations, and can review ring failures with you. See our guide to carbide roll rings.
Quality control
Density, hardness, binder content and microstructure checks; ultrasonic or other crack inspection; full dimensional and surface check of bore, faces and grooves. Certificates go with every lot.
Frequently asked questions
Can you match the rings we use now?
Yes. Send the ring drawing and current grade designation. We offer the equivalent grade, and an alternative if you want longer life or fewer cracks.
Why do carbide rings crack?
The most common causes are poor or uneven cooling, too little regrind after a campaign, and mechanical shock in fitting. A higher binder grade can help in positions with frequent cracks.
Are tungsten carbide rolls the same as carbide roll rings?
Yes. Most carbide "rolls" in rod and bar mills are rings fitted on a shaft or arbor. Composite rolls with a carbide working layer are also available.