Round Steel Chains (Mining)

About this product

THD Round Steel Chain (THIELE Heavy Duty) [spec tables 1–2] THIELE round-link chains can be used on both face conveyors and stage loaders and are also suitable as traction elements for coal ploughs. To ensure that its products can meet the tough demands of today’s mining industry THIELE has developed its own chain steels based on many years of manufacturing knowhow. Each production stage is accompanied by careful and thorough quality control tests. THIELE chains are recognised the world over for their performance and durability. This is why THD round-link steel chains are hardened and tempered to a strength of 345 – 375 HB10 (which applies uniformly over the entire link). For chains intended for face conveyors this strength level represents the optimum in terms of impact resistance (notch impact strength) and wear resistance (hardness).

TIP Round Steel Chain (THIELE Improved Performance) [spec tables 3–4] THIELE TIP Round Link Chains have been developed for use on high-performance coal faces. By employing special alloyed steel the main operating parameters of these mining chains have been significantly improved without any loss in impact strength and deformability. As the use of additional alloy constituents means higher material costs the added benefits of TIP Chains only begin to be felt on high-performance faces where the extra expenditure is soon offset by the higher face output and the higher working capabilities of the chains.

TRQ Round Steel Chain (THIELE Rock Quality) [spec tables 5–6] 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.

TSC Round Steel Chain (THIELE Super Crown) [spec tables 7–8] THIELE developed the TSC series of Round Link Chains with wear-resistant crowns (THIELE Super Crown) in order to reduce link wear on plough chains and increase chain operating life. As frictional heat in the fast running plough chains (which travel at over 3.0 m/s) leads to hardening of the legs and to dangerous crack formation the material strength of the legs is deliberately reduced by secondary heat treatment – thereby increasing the crack arrest capacity. THIELE TSC chains are widely used on chain scraper conveyors because of the increased hardness of their crowns. This extra hardness rating inevitably means that the chains are more susceptible to stress corrosion cracking and so TSC Chains are not recommended for corrosive environments – especially when fitted to face conveyors.

TSD Round Steel Chain (THIELE Super Duty) [spec tables 9–10] Like TRQ Chains, THIELE TSD Round Link Chains (THIELE Super Duty) were developed in order to achieve the greatest possible wear resistance when used on chain scraper conveyors and a higher breaking force. The material strength of the legs is deliberately reduced by precise heat treatment, which increases the crack arrest capacity in order to prevent cracking caused by the friction martensite as a result of chain speeds of > 0.5 m/s. This makes TSD Chains ideally suited for use on stage loaders (BSL). The extreme crown hardness of TSD Chains results in a very high wear resistance and a higher breaking force too. The latter is however an unintentional side effect. As the increased hardness also means a reduction in toughness and a greater sensitivity to stress corrosion cracking TSD Chains are not recommended for use on face conveyors operating in a corrosive environment.

About conveyor chain

Chain built to carry or drive material along a conveyor, including attachment and plate-link types.