EMT Steel Pipe Mills Manufacturers

As a manufacturer of EMT (Electrical Metallic Tubing) Steel Pipe Mills, Shijiazhuang Faith Machinery Co.,Ltd offers complete production lines for thin-wall conduit tubes used in electrical installations. EMT conduit requires tight dimensional control, smooth internal and external surfaces, and precise end-cutting to facilitate wiring runs and junction box connections.

Mill Configuration and Forming Steps
EMT steel pipe production begins with galvannealed or pre-galvanized strip coil fed into a tension-leveling unit designed to remove residual camber in thin gauges (typically 0.5 mm to 0.8 mm). Forming stands with minimal stand spacing guide the strip into a tight U-shape before a final seaming roll closes the tube. High-frequency induction welding ensures a clean, continuous weld seam with negligible bead height.

Sizing and Surface Finishing
After welding, tubes pass through calibration rolls that adjust outer diameter to EMT standards (commonly 16 mm to 32 mm nominal sizes) with tolerances within ±0.1 mm. Internal brushing stations remove any weld flash or scale, and pneumatic blow-off units clear debris. Surface inspection cameras detect coating imperfections, triggering a diversion of non-conforming sections.

Cutting and Packaging
Flying cutoff shears synchronized to line speed produce conduit lengths—typically ranging from 3 ft to 20 ft (914 mm to 6,096 mm)—with end squareness within ±1 mm. Automatic end deburring modules may be added to smooth cut edges. Finished tubes are conveyed to inline bundling stations, where pneumatic straps secure groups of tubes for pallets or cartons.

Control and Quality Assurance
The EMT Steel Pipe Mill is governed by a centralized PLC with recipe-based controls for strip tension, welding power settings, calibration roll gaps, and shear timing. Laser micrometers before and after sizing feed data to the automatic gauge control to maintain diameter consistency. All process parameters and inspection results are logged for ISO 9001 traceability.

Support and Maintenance
Manufacturing thin-wall conduit places high demands on roll alignment and weld stability. Shijiazhuang Faith’s service package includes precision roll alignment during installation, weld head calibration, and operator training in seam inspection techniques. Scheduled maintenance covers bearing checks, coil lubrication points, and ultrasonic weld integrity testing. Remote diagnostics support rapid resolution of issues, ensuring continuous EMT conduit production.