What Is a Steel Cord Conveyor Belt?

A steel cord conveyor belt is a high-tensile rubber conveyor belt that uses longitudinally arranged steel cords as its main tension member, instead of the multiple textile plies used in fabric conveyor belts. This construction provides high tensile strength, substantially lower elongation than multi-ply fabric belts, and dependable resistance to demanding bulk-material conveying conditions.

Steel cord belts are commonly selected for long-distance belt conveyors, high-tension overland routes, and heavy-duty applications in mining, cement, and port operations.

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Steel Cord Conveyor Belt Construction

A steel cord conveyor belt is built around a single layer of evenly spaced steel cords running in the longitudinal direction of the belt. The cords are formed from multiple high-strength steel wires and embedded in a rubber compound that bonds the belt structure together.

Typical construction layers include:

• Top cover rubber: Protects the belt from abrasion, impact, cutting, and material temperature.
• Steel cord layer: Provides the primary tensile strength of the belt.
• Core rubber bonding layer: Bonds the covers to the reinforcement layer and protects against moisture.
• Bottom cover rubber: Resists wear from pulleys and conveyor rollers.

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Steel Cord Belt Strength Grades: ST630–ST4000

Steel cord belts are designated by the ST prefix followed by their nominal tensile strength in N/mm. For example, an ST1600 belt has a nominal tensile strength of 1,600 N/mm. Higher ST grades are generally used when the conveyor has greater operating tension, longer center distance, or higher lift.

Grade	Tensile Strength (N/mm)	Typical Application
ST630	630	Short overland conveyors and selected mobile or plant applications
ST1000	1,000	Medium-distance overland and industrial plant conveyors
ST1600	1,600	Long overland and higher-lift conveyor systems
ST2500	2,500	High-tension overland and high-lift applications
ST4000	4,000	Maximum-tension applications requiring project-specific engineering

For complete specifications including cord diameter, pitch, belt width ranges, and intermediate grades (ST800/ST1250/ST2000/ST3150), see the steel cord conveyor belt specifications table.

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Cover Grade Options

The rubber cover compound should be selected according to the conveyed material, temperature, abrasion level, and environmental conditions.

Cover Type	Best For
Standard Rubber	General bulk materials: coal, limestone, aggregates, grain
Abrasion-Resistant (DIN Y/Z)	Iron ore, copper ore, quartz, granite, crushed rock
Heat-Resistant (T1/T2/T3)	Cement clinker, sinter, coke, hot bulk materials
Flame-Retardant (ISO 340)	Coal handling, underground mining, controlled industrial environments
Cold / Oil / Chemical-Resistant	Cold-climate mining, fertilizer, salt, chemical handling

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Steel Cord vs Fabric Conveyor Belt

Feature	Steel Cord Belt	Fabric Belt
Reinforcement	Longitudinal steel cords	Textile plies (EP/NN)
Tensile Strength	Up to 4,000 N/mm	Typically lower
Elongation	Low	Higher
Pulley Diameter	Larger required	Smaller acceptable
Best For	Long-distance, high-tension	Moderate distance, compact layouts

For a detailed comparison, see Steel Cord vs Fabric Conveyor Belt: Which One Do You Need?

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When Should You Choose a Steel Cord Belt?

• Long-distance conveying: Route has long center distance or requires fewer transfer points.
• High calculated belt tension: Fabric belt range is not suitable for required tension.
• Limited take-up travel: Lower elongation reduces take-up travel requirement.
• Heavy-duty conditions: High tonnage, abrasive material, or demanding loading conditions.

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Frequently Asked Questions

How are steel cord conveyor belts spliced?

Steel cord belts are usually joined by hot vulcanized splicing. Cord ends are prepared according to the specified splice layout, embedded in fresh rubber compound, and cured under controlled heat and pressure.

Can a steel cord belt be used on a curved conveyor?

Yes. Steel cord belts can be used in selected horizontal and vertical curve applications when belt construction, route geometry, tension distribution, and transition zones are engineered together. See Long Distance Curved Belt Conveyor solutions.

What is the minimum pulley diameter for a steel cord belt?

Minimum pulley diameter increases as steel cord diameter and tensile strength increase. Required diameters must be confirmed using the belt manufacturer's specification and applicable conveyor design standard.

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