Factory Images
Company Introduction
Established in 2003, COMPS has developed deep expertise in the full forged roll production chain — from vacuum degassed ingot sourcing through open-die forging, multi-stage heat treatment, precision grinding, and full mechanical testing. The facility operates large hydraulic open-die presses, a battery of heat treatment furnaces, and CNC grinding lines capable of producing rolls up to 60 tons. COMPS supplies work rolls, backup rolls, and intermediate rolls to tandem cold mills, reversing mills, hot strip mills, and plate mills globally. VSAG is the exclusive Indian representative for COMPS, providing local technical support and end-to-end supply management.
Technology
Open-Die Forging
Hydraulic open-die presses deliver controlled reduction ratios of 4:1 or greater, ensuring a fully refined uniform grain structure free of ingot segregation throughout the roll cross-section.
Vacuum Degassed Ingots
All forging stock is sourced from vacuum degassed ingots with certified low sulphur and phosphorus, providing the cleanest possible starting material for critical roll applications.
Differential Heat Treatment
Computer-controlled quench and temper cycles produce the required surface hardness while maintaining a tough, ductile core — critical for fatigue resistance in backup and work rolls.
CVC Profile Grinding
CNC grinding lines with active measurement closed-loop control produce Continuously Variable Crown (CVC) profiles to customer-specified taper curves for 6-Hi intermediate rolls.
Products Manufactured
- Forged Work Rolls (HSS, Hi-Cr, Tool Steel)
- Forged Back-Up Rolls (up to 60 tons)
- Forged Intermediate Rolls (CVC-capable)
- Forged Mandrel Bars
- Table Rolls and Guide Rolls
- Straightener Rolls
Manufacturing Process
- 01
Ingot Sourcing
Vacuum degassed, low-sulphur alloy steel ingots sourced and certified before forging. Chemistry verified by OES analysis.
- 02
Open-Die Forging
Multi-pass open-die forging on hydraulic press with controlled reduction ratio (minimum 4:1) to achieve grain refinement and close-out porosity.
- 03
Normalising
Full normalising heat treatment to homogenise microstructure after forging and prepare for final heat treatment.
- 04
Quench & Temper
Controlled quench and temper cycle programmed to achieve specified surface hardness profile and core toughness requirements.
- 05
Rough & Semi-Finish Machining
CNC turning to establish final geometry. Dimensional and hardness inspection at this stage before finish grinding.
- 06
Precision Grinding
CNC cylindrical grinding to final dimension and surface finish, with CVC profile grinding capability for intermediate rolls.
- 07
Mechanical Testing
Tensile strength, yield strength, elongation, and Charpy impact testing from representative coupons from each heat.
- 08
Full Inspection & Certification
UT, MPI, hardness mapping, dimensional inspection. Full material certificate, mechanical test report, and dimensional report issued.
Quality Control
Mechanical Testing
Tensile, yield, elongation, and Charpy impact values verified from end-grain and side-grain coupons from each heat.
Ultrasonic Testing (UT)
Full volumetric UT inspection to international standards, verifying roll integrity through the complete cross-section.
Magnetic Particle Inspection (MPI)
Surface and near-surface crack detection using magnetic particle inspection after finish grinding.
Hardness Profile Mapping
Shore D and Rockwell hardness measured axially and radially to verify surface hardness uniformity and depth of hardened zone.
Forging Ratio Documentation
Reduction ratio calculated and documented from ingot dimensions to final forged dimensions for each roll, confirming minimum 4:1 requirement.
Certifications
- ISO 9001:2015 — Quality Management System
- ISO 45001 — Occupational Health & Safety
- TÜV Rheinland Third-Party Inspection Approved
- Lloyd's Register Approved Manufacturer
Location
Changzhou, Jiangsu Province, China
Wujin District, Changzhou, Jiangsu Province, 213100, P.R. China
Downloads
Available upon enquiry. Contact VSAG to request partner documentation.
Products Supplied Through VSAG
Work Rolls
High-performance work rolls engineered for hot and cold rolling mills, delivering consistent surface quality and extended campaign life.
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Back Up Rolls
Heavy-duty back-up rolls up to 60 tons — forged and cast grades available for the most demanding mill configurations.
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Intermediate Rolls
Precision intermediate rolls that maintain strip flatness and profile control across multi-stand mills.
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Forged Rolls
Forged rolls with superior mechanical properties and fatigue resistance, suited for the most critical rolling positions.
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