FAQs

In pneumatic transport pipelines, centrifugal force concentrates particle impact on the outer radius (back) of the pipe elbow, while the inner radius (throat) experiences minimal wear. GAC’s asymmetric design casts a thicker Kalcret layer on the high-wear outer radius and a thinner layer on the inner radius, optimizing material weight, reducing pipe load, and lowering the procurement cost for the plant.

Kalcret BTX is applied as a jointless, monolithic lining, completely eliminating joint lines and exposed adhesive areas. Furthermore, Kalcret is mechanically anchored onto a 5mm-thick expanded steel mesh welded directly to the casing, ensuring the lining cannot delaminate even under high-velocity dust streams.

This failure is driven by aerodynamic erosion targeting the joint lines between individual ceramic tiles. Fine, high-velocity dust particles blast the soft epoxy adhesive out of the joints. Once the adhesive is eroded, gas pressure forces its way underneath the ceramic tiles, lifting and peeling them off in sheets.

At this location, hot sintered ore from the kiln carries high thermal load. Standard bimetallic plates (like W100) are limited to operating temperatures below 350°C. For these conditions, GAC recommends Kalmetall W145. Formulated with special niobium (Nb) and molybdenum (Mo) alloying elements, Kalmetall W145 maintains its carbide matrix stability and extreme hardness (HV 800) at continuous operating temperatures up to 750°C.

Standard flux-cored wire hardfacing often dilutes carbon and chromium into the steel backing plate during welding, causing carbide concentration to drop dramatically toward the fusion line. This leads to accelerated wear once the top layer is gone. Kalmetall W100, manufactured via a proprietary powder cladding and fast-crystallization process, maintains a uniform distribution of chromium carbides (M7C3, with micro-hardness exceeding HV 1300) from the outer wear surface all the way down to the steel backing boundary, extending wear life by 2 to 3 times.

For standard wear plates, increasing hardness often results in increased brittleness, which can lead to micro-cracking and eventual fracturing under heavy dynamic impacts from excavator bucket drops. Hardox 500 TUF bridges this gap by combining high hardness (475 – 505 HBW) with exceptional impact toughness (Charpy V-notch toughness of 45J at -40°C), completely preventing cracking and structural failure in dumper beds.

Q355B has a low yield strength (~355 MPa), meaning it undergoes permanent plastic deformation (denting and warping) under dynamic loading. Conversely, Hardox 500 is a through-hardened steel with a surface hardness of 475 – 505 HBW and an actual yield strength of 1250 – 1400 MPa. It resists scratch-gouging and springs back to its original flat profile even after absorbing high-impact forces from falling boulders.