Tungsten Carbide rings are used in the manufacturing of mill rolls for extended life in applications where long rolling campaigns are required. Their extreme hardness makes them suitable for wire rods finishing blocks and some shaping applications. The cemented carbides rolls are divided into the conventional WC-Co alloys and the corrosion resistant alloys with a mixed binder Co-Ni-Cr. The binder contents vary according to the specific requirements of the rolling mill.

Properties

Tungsten Carbide Guide Rollers have extremely high wear resistance, strength and toughness. Compared with ordinary steel, the service life is extended ten times. It can be used stably and long-term even in harsh abrasion environments.

As far as the materials for our products, there are two series as Wc-Co and Wc-Co-Ni-Cr which possess the good comprehensive mechanical properties. The bending strength and impact toughness reach 2200 Mpa and (4-6)x106J/m3 respectively. Its hardness and wear resistance comes from tungsten carbide (Wc) while the toughness and strength depend on the binding agent (Co-Ni-Cr).

Table of Grades and Properties of Carbide Roll Rings and related data

Note: Physical & mechanical properties are for reference only and their variations are as per national or enterprises’s standards.

 

Dimensions and precision of finished Carbide Roll Rings

Dimension range of finished roll rings

Tolerances allowable for the ODI and height of roll rings

 

Technical Specifications of finished Carbide Roll Rings

The allowable deviation of carbide roll rings

 

• Radial runout of groove ≤0.013mm
• Radial runout of periphery ≤0.013mm
• End face runout ≤0.02mm
• End face planeness ≤0.01mm
• End face parallelism ≤0.01mm
• Inner hole cylindricity ≤0.01mm

The allowable deviation in external diameter, internal diameter and height is to be determined based on customer needs.

Roughness of carbide rolls

 

• Inner hole roughness 0.4m
• Periphery roughness 0.8m
• End face roughness 0.4m

 

Roll rings for high speed rolling of ribbed steel bars

Composite cemented carbide roll rings