Products

Spheroidal Graphite Pearlitic & Bainitic (Acicular) Rolls

Spheroidal Graphite (SG) Rolls—also known as Nodular Iron Rolls—are manufactured using high-nodularity cast iron with carefully controlled alloying elements. These rolls are available in two main microstructural forms: Pearlitic and Bainitic (Accicular), depending on their heat treatment and alloy content.

Pearlitic SG Rolls feature a pearlitic matrix with spheroidal graphite evenly distributed throughout, offering a great combination of strength, wear resistance, and toughness. Accicular SG Rolls (also referred to as Bainitic SG Rolls) have a bainitic or acicular matrix, which provides higher strength, improved thermal shock resistance, and superior toughness for more demanding rolling conditions.

Both types are known for excellent performance in rolling mills, especially where shock loading, thermal stresses, and consistent surface finish are critical. These rolls can be customized in terms of hardness, composition, and size based on customer requirements.

  • High resistance to wear, fatigue, and thermal cracking
  • Good toughness with controlled hardness
  • Excellent graphite nodularity for improved lubrication and reduced friction
  • Custom hardness ranges (40–80 HSD) depending on grade and application
  • Longer service life and reduced roll changes

SG Pearlitic and Accicular Rolls are widely used in both hot and cold rolling mills for a range of products. These include:

  • TMT Bar Mills – Intermediate and finishing stands, ensuring consistent ribbed bar quality
  • Section Mills – For rolling channels, angles, flats, and structural steel shapes
  • Wire Rod Mills – Delivering smooth surface finishes and uniform wire sizes
  • Strip Mills – Rolling narrow strips and sheets with high dimensional precision
  • Re-Rolling Mills – Ideal for rolling billets into smaller cross-sections with minimal wear
  • Pearlitic rolls are typically used in less demanding applications where wear resistance and cost-efficiency are priorities, while Accicular (Bainitic) rolls are used in more aggressive rolling environments requiring higher strength and thermal resistance.

    • Carbon Silicon Manganese Nickle Chromium Molybdenum Hardness Tensile Strength
    NIP1 2.90-3.20 1.50-2.00 0.70-Max 1.40-1.80 0.40-0.60 0.25-0.45 45-55 400-500
    NIP2 3.00-3.40 1.50-1.80 0.70-Max 1.50-1.90 0.40-0.70 0.25-0.45 55-65 400-500
    NIA1 3.10-3.50 1.20-1.50 0.70-Max 2.50-3.00 0.30-0.70 0.60-1.10 65-75 500-600
    NIA2 3.25-3.55 1.10-1.40 0.70-Max 2.80-4.00 0.30-0.80 0.70-1.20 75-80 500-600