Introduction

Idler steel tubes are essential components used in conveyor systems, serving as the outer shell of conveyor idlers. They play a vital role in supporting the conveyor belt and ensuring smooth, low-resistance material transport in mining, cement, steel, power, and port industries. At Womic Steel, we manufacture idler tubes with high dimensional precision, superior surface finish, and strict quality control to meet both domestic and international standards.

Manufacturing Standards and Materials

Our idler tubes are manufactured according to various international and regional standards to suit different markets and applications. Commonly supported standards include:

- GB/T 13792 – Welded steel tubes for idlers in belt conveyors (China)

- SANS 657-3 – Steel tubes for conveyor idlers (South Africa)

- DIN 2391 / EN 10305 – Precision steel tubes (Germany/Europe)

- ASTM A513 / A500 – Mechanical and structural tubing (USA)

- IS 9295 / IS 9296 – Conveyor idler tubes (India)

Common Materials:

- Carbon Steel Grades: Q235, Q345, S235JR, S275JR, ST37, ST52, A36, A500 Gr.B

- Customized steel grades available upon request

Dimensional Range

We manufacture a wide range of idler steel tubes to match different roller designs:

- Outer Diameter (OD): 63.5mm – 219mm

- Wall Thickness: 2.0mm – 10mm

- Length: Up to 2200mm or as per client specifications

- Surface Finish: Black, painted, oiled, or hot-dip galvanized

Tolerance Control and Quality Assurance

Precision is critical in idler tubes to ensure low friction, balanced rotation, and extended service life. At Womic Steel, all tubes are subject to strict dimensional and concentricity controls.

Tolerance Standards:

- OD tolerance: ±0.2mm or as per standard (e.g., SANS 657-3: ±0.3mm for OD ≤ 152mm)

- Wall thickness tolerance: ±0.1mm；

- Straightness deviation: ≤1.5mm per piece

- Ovality & eccentricity: Within 0.2mm (adjustable based on customer requirements)

- Concentricity tolerance: ≤0.2mm

Inspection Items:

- Dimensional inspection (OD, wall thickness, length,Ovality)

- Roundness and straightness testing

- Internal weld bead removal quality

- Visual surface inspection

- Hydraulic or air pressure testing (optional)

- Ultrasonic or eddy current test (on request)

Production Process

Our idler tube production follows a streamlined and automated process:

1. Material Preparation: Raw steel coil slitting and quality inspection

2. High-Frequency Welding: Precise tube forming with inline seam welding

3. Weld Bead Removal: Internal and external welds are smoothly trimmed

4. Sizing and Calibration: Ensure dimensional consistency and roundness

5. Cutting and Chamfering: Precision cutting to required length and beveling ends

6. Surface Protection: Anti-rust oiling, painting,etc

Features and Benefits

- High Roundness & Concentricity: Reduces belt deviation and energy loss

- Smooth Inner Surface: Prevents seal damage and improves bearing life

- Excellent Weld Seam Quality: Seamless rotation and minimal imbalance

- Customizable Dimensions & Finishes: Tailored to your conveyor system

- Corrosion Protection Options: Ideal for outdoor and corrosive environments

Application Fields

Womic Steel’s idler tubes are widely used in:

- Underground mining conveyor rollers

- Open-pit belt conveyors in ports and terminals

- Bulk material handling systems in power plants

- Cement plant raw material conveyors

- Aggregate and grain handling conveyors

Delivery, Packing & Export Support

With a monthly capacity exceeding 1500 tons, Womic Steel ensures fast turnaround times:

- Standard delivery: 7–10 working days

- Customized orders: 10–15 working days

- Packing: Hexagonal bundles with steel straps, optional waterproof wrapping

- Container loading: Professionally reinforced for sea shipment

- Certificates: Mill Test Certificate (EN 10204 3.1), SGS/BV/Third-Party available

Why Choose Womic Steel?

- In-house Manufacturing: From slitting to final testing, ensuring full quality control

- Comprehensive Standards Support: Full compliance with SANS, GB, ASTM, EN, and more

- Experienced Exporter: Serving clients in over 50 countries with multilingual support

- Custom Machining Service: Drilling, slotting, bending, and end-preparation available

- Technical Consultation: Free drawing support and material optimization suggestions

Website: www.womicsteel.com

Email: sales@womicsteel.com

Tel/WhatsApp/WeChat: Victor: +86-15575100681 or Jack: +86-18390957568