ST2250 Steel Cord Conveyor Belt

CBC India's ST2250 steel cord conveyor belt is specified at the absolute upper boundary of commercially available steel cord belting — engineered for gigantic overland conveying infrastructure in premier global mining ventures where the ST2000 grade no longer provides adequate safety factors at the system's rated operating tension and haul distance. Per DIN 22131 and ISO 283, the "2250" designation guarantees a minimum breaking strength of 2,250 Newtons per millimeter of belt width, defining this belt's application domain: mega iron ore pipelines, diamond mine expansion conveyors, and cement mega-kiln clinker transport circuits handling billions in annual material tonnage across single-flight distances that redefine what overland conveying infrastructure means at an engineering level.

Construction

The ST2250's tensile core is built on galvanized steel cords in 7×19 strand configuration, with individual cord diameters ranging from 5.5 mm to 6.8 mm at an 11–15.2 mm pitch — accommodating configurations such as 97 cords in a 9/79/9 arrangement across an 1,800 mm belt width. Each cord delivers a minimum breaking force of 28–30 kN, with maximum rubber saturation during vulcanization achieving complete wire-level encapsulation throughout the cord cross-section. At the ST2250 tensile class, rubber penetration quality is a structural requirement, not a manufacturing preference: incomplete encapsulation under sustained cyclic bending at these operating tensions accelerates internal corrosion fatigue to cord fracture within a fraction of the belt's designed service life. Total belt thickness runs 38–44 mm with a reference mass of 35–62 kg per linear meter at 1,800 mm width depending on cover specification. Standard cover configurations include 6 mm top and bottom as baseline, with 8/6 flame-retardant variants available. Belt widths extend to 3,400 mm with roll lengths exceeding 1,000 m per section. Minimum pulley diameters are specified at 800 mm.

Top cover compounds are specified to DIN Grade Z as standard, with low rolling resistance formulations, heat-resistant grades rated to 320°C, and flame-retardant variants compliant with ISO 284 and EN 16974 for underground iron and uranium drift applications.

Performance

Working elongation ranges from 0.1–0.3% at rated tension, maintaining precise belt alignment and stable tension distribution across single-flight hauls exceeding 8 km. Operating tensions surpass 1,900 PIW at conveying speeds up to 9.5 m/s. Ultimate troughability delivers throughput capacity gains exceeding 75% over stiffer constructions, while the featherweight carcass engineering reduces drive power consumption by 40–45% against fabric ply alternatives at equivalent throughput. Impact tolerance extends to 650 mm boulder and sinter cascade loading without cord displacement or longitudinal rip initiation.

Installation and Maintenance

Extended two-step hot-vulcanized splices at 1,150 mm splice length per DIN 22131 Part 3 restore 100% cord efficiency at every joint. In-service monitoring integrates electromagnetic induction scanning, laser-based rip detection, and structured inspection tracking for continuous non-destructive cord surveillance across the full belt length. Adaptive idler systems and real-time tension analytics eliminate developing fault conditions before unplanned stoppages occur. ST2250 belts achieve a documented service life of 25–50 years across the world's most ambitious and highest-value bulk material handling installations.

Technical specification of ST2250 Conveyor Belt

Standard Steel Cord Conveyor belt Range As per DIN 22131

Available Stocks of ST2250 conveyor belt