THIELE Rock Quality Chains (TRQ) were specially developed for the conveying of abrasive materials in stone drifts and roadway drivages. Careful tempering ensures hardness levels of 424 - 453 HB over the entire cross-section of the material and a uniform surface hardness at any point on the chain link.
The TRQ Chain also exhibits a high tensile strength with a fracture stress of 1000 N/mm². The combination of tensile strength and hardness opens up opportunities for use in difficult conveying situations where high tensile loads would rule out the use of surface hardened chains.
TRQ Chains can be operated up to a maximum speed of 0.5 m/s, as the frictional heat generated at higher chain speeds would result in hardening of the shanks and lead to dangerous crack formation.