CGL Skin Pass Mill Rolls

High-Performance Work Rolls & Backup Rolls for CGL Skin Pass Mills

Product Overview

The Skin Pass Mill (SPM) or Temper Mill in a hot-dip galvanizing line is critical for achieving the final mechanical properties, superior flatness, and targeted surface texture of the galvanized coil. We supply a comprehensive range of premium Work Rolls and Backup Rolls engineered to withstand immense rolling forces and cyclic fatigue.

Our rolls provide exact roughness transfer ($R_a$ and $R_c$ peaks) onto the zinc layer, which is essential for the paint adhesion and deep-drawing performance required by automotive exposed panel manufacturers and premium home appliance brands.

Technical Edge & Engineering Advantages

• Ultra-Pure Forged Steel Integrity: Manufactured from vacuum-degassed, electro-slag remelted (ESR) forged steel (such as 3-5% Cr alloys, semi-high-speed steel, or full HSS) to eliminate micro-inclusion defects and structural non-uniformity.

• Deep Hardness Uniformity: Advanced dual-frequency or low-frequency induction hardening achieves an optimized, extra-deep hardened layer, allowing multiple re-grinding cycles without losing surface hardness.

• Flawless Roughness Retention: Exceptional wear resistance guarantees that the laser-textured (LT) or shot-blasted (SBT) roughness profile remains stable over long rolling tonnages, minimizing roll-change downtime.

Technical Specifications

• Roll Classifications: Work Rolls (WR), Backup Rolls (BUR), Intermediate Rolls (IR)

• Materials: Forged Cr3%, Cr5%, Semi-HSS, High-Speed Steel (HSS)

• Surface Hardness: Work Rolls: 90-100 Shore C (HSD) | Backup Rolls: 60-75 HSD

• Hardened Layer Depth: ≥15mm - 25mm (Radial) according to roll diameter