ZM INDUSTRY CO., LTD

ZM INDUSTRY CO., LTD., established in 2003, supplies engineered castings and rolling mill components for global steel plants. We provide reliable, export-ready housings, frames, gears, and industrial spare parts through a complete system integrating design, manufacturing, inspection, and logistics.

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Product Introduction

why choose our products

The ROLL HOUSING is a heavy-duty cast steel housing built from premium 8630 material with a controlled hardness of 190–220 BHN, engineered as the primary load-bearing frame in modern rolling mill stands and VDM lines. Its rigid structure delivers stable deformation resistance and strong fatigue performance, ensuring precise roll alignment and reduced vibration during continuous production. Each housing is supplied with complete inspection documentation, including chemical analysis, hardness verification, dimensional reports with gauge-pin checks, MPI/dye-penetrant testing, 3.2 Ra surface finish confirmation, and CT9 casting tolerance compliance. This export-ready component supports roughing stands, finishing stands, and OEM replacement programs for steel mills seeking reliable, long-life heavy-duty mill components.

Technical Specifications

Accept customization

products
Name	ROLL HOUSING
Material	8630 cast steel	Ensures toughness, load capacity, and long service life
Hardness	190–220 BHN	Balanced strength and ductility for reliable shock absorption under high rolling forces
Surface Roughness	3.2 Ra	Improves contact stability, minimizing wear on mating components during operation.
Heat Treatment	Normalizing + tempering process applied	Enhances internal structure uniformity and improves fatigue resistance
Dimensional Accuracy	Full-size inspection	Ensures correct alignment and reduces vibration, improving rolling precision
Internal Soundness	100 percent MPI and dye penetrant examination	Detects cracks and surface defects early, securing safe long-term operation
Load-Bearing Capacity	Designed for high vertical and lateral forces of modern rolling mill stands	Maintains frame rigidity during intensive continuous rolling
Compatibility	Suitable for roughing stands, finishing stands and VDM lines	Reduces downtime and enables easy integration into existing mill setups.
Customization capabilities	Accept customization	Customers can provide drawings to customize products

Quality Control

Our strict quality control system ensures every roll housing delivers dependable strength, accurate fit, and long service performance. By combining MT, UT, dimensional checks, and metallurgical verification, we minimize failure risks, reduce maintenance interruptions, and help customers operate their rolling lines with higher stability, predictable output, and lower overall operational cost.

Material Verification: Chemical analysis and hardness testing confirm stable metallurgy and long-term reliability.
MT Magnetic Particle Test: Detects surface cracks early, preventing failure under heavy rolling loads.
UT Ultrasonic Inspection: Identifies internal defects, ensuring structural integrity for continuous mill operation.
Surface Examination: Dye penetrant checks verify clean surfaces for secure fit-up and reduced wear.
Dimensional Inspection: Full-size measurement with gauge pins guarantees precise alignment and lower vibration.
Casting Integrity Review: CT9 tolerance confirmation ensures consistent quality across all production batches.

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Shipping and packaging

Fumigation-free wooden crates (ISPM-compliant) for smoother customs and zero fumigation delays.
Internal reinforced supports protect precision surfaces from impact.
Clear handling labels and lifting points reduce port handling risks.
Full document for faster customs clearance.

Professional lashing and bracing reduce transit damage risk.
Export-ready documentation simplifies banking, customs, and inspection.
CIF/FOB terms and insurance guidance protect buyer interests.
Predictable lead times and shipment tracking support overseas production planning.
Heavy-duty export packing minimizes port detention and accelerates inland delivery.