Products

Double Pour Definite Chill (DPDC) Rolls

Double Pour Definite Chill (DPDC) Rolls are high-quality composite rolls produced using the advanced double pouring technique. In this process, a hard, wear-resistant white iron outer shell (Definite Chill) is metallurgically bonded to a strong, ductile grey iron or nodular iron core. The outer layer contains finely distributed graphite and carbide particles in a pearlitic or martensitic matrix, giving the rolls excellent surface hardness, superior wear resistance, and excellent thermal conductivity.

The inner core provides the necessary toughness and crack resistance, allowing the rolls to perform reliably under thermal stress and mechanical shock. The double pour process ensures a strong bond between shell and core, minimizing the risk of shell separation and improving overall roll life and stability.

  • Hard chill zone (55–80 HSD) with a robust, shock-resistant core
  • Superior wear resistance and surface finish retention
  • Excellent thermal shock resistance and crack prevention
  • Long service life and reduced roll changes
  • Custom sizes and hardness profiles available

DPDC Rolls are widely used in rolling mills where a balance of surface hardness and core strength is essential. They are ideal for:

  • TMT Bar Mills – Used in roughing and intermediate stands for prolonged service life
  • Section Mills – Suitable for rolling beams, angles, and channels with minimal surface wear
  • Wire Rod Mills – Ensures dimensional consistency and smooth finishes under continuous operation
  • Strip and Sheet Rolling Mills – Maintains excellent surface quality and rolling precision
  • Light & Medium Re-Rolling Mills – For general-purpose applications requiring consistent performance
  • DPDC Rolls provide an efficient, economical solution for high-production mills aiming to optimize performance, reduce downtime, and maintain product quality over extended rolling campaigns.

    • Carbon Silicon Manganese Nickle Chromium Molybdenum Hardness Tensile Strength
    Shell 2.90-3.30 1.00-Max 0.50-1.00 1.00-2.50 1.00-1.50 0.25 65-75 350-500
    Core 3.10-3.50 1.50-Max 0.60-0.90 0.40-1.00 0.25-0.50 - 30-40 350-500
    Shell 3.20-3.50 1.00-Max 0.50-0.70 1.00-3.50 1.20-1.80 0.25-0.50 75-85 350-500
    Core 3.20-3.50 1.50-Max 0.60-0.90 > = 1.00 0.25-0.50 - 30-40 350-500