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Acicular Nodular Cast Iron Roll, hardness and wear resistance is more than the SGP quality, while at the same time exhibiting high strength and resistance to fire-cracks. 

SGP Roll

SGP rolls are composed by nodular graphite and carbides arranged in a pearlitic matrix. We called SGP roll or Pearlitic Nodular Cast Iron Roll. 

Forged steel rolls for cold rolling mills are widely applied to work rolls, intermediate rolls, and backup rolls. With high and homogeneous hardness in the working layer, these rolls provide superior wear resistance, high toughness, and excellent resistance to accidental damage.

The depth of the hardened layer can reach over 30mm depending on the roll design and application requirement. Through optimized forging, heat treatment, and machining processes, LONSUN forged rolls ensure stable hardness distribution and reliable service performance for cold rolling operations.

Chemical Composition

Symbol C Si Mn Cr Ni Mo V W
FSC-1 0.80-0.95 0.15-0.45 0.20-0.55 1.70-2.40 ≤0.25 0.20-0.40 ≤0.15 -
FSC-2 0.80-0.95 0.25-1.00 0.20-0.70 2.40-3.50 ≤0.25 0.20-1.00 0.05-0.15 -
FSC-3 0.75-0.95 0.20-1.00 0.20-0.50 2.80-3.60 ≤0.80 0.15-0.40 - -
FSC-4 0.60-0.80 0.30-0.80 0.40-0.90 2.50-3.50 ≤0.80 0.20-0.60 - -
FSC-5 0.70-0.95 0.20-0.90 0.20-0.50 4.00-6.00 ≤0.80 0.15-1.20 0.35 -
FSC-6 0.33-0.43 0.80-1.20 0.20-0.50 4.75-5.50 ≤0.80 1.10-1.60 0.30-0.60 -
FSC-7 0.80-0.90 ≤0.40 ≤0.40 3.80-4.40 ≤0.80 4.50-5.50 1.75-2.20 5.50-6.75

Barrel Hardness (HS)

Hardness FSC-1 FSC-2 FSC-3 FSC-4 FSC-5 FSC-6 FSC-7
Barrel 60-80 76-80 60-80 60-70 65-75 65-71 80-95
Surface 90-100 90-100 90-100 65-80 90-100 75-82 -

Recommended Hardness (HS)

Portion Application Hardness
Barrel Finishing work rolls for strip and plate mills 90-96
Cold work rolls and temper rolls for non-ferrous strip, foil and bright sheet ≥95
Neck Small diameter cold work rolls installed with needle roller bearing ≥80
Cold work rolls with particular requirement of resistance to wear on bearing portion 50-70
Work rolls without special requirement 30-50

Product Features

  • High and homogeneous working layer hardness.
  • Superior wear resistance for cold rolling applications.
  • High toughness and excellent resistance to accidental damage.
  • Hardened layer depth can reach over 30mm depending on application requirements.
  • Suitable for work rolls, intermediate rolls, and backup rolls in cold rolling mills.

Forged steel rolls for hot mills are manufactured from forged steel blanks with advanced heat treatment processes to achieve stable barrel hardness and appropriate hardening depth. These rolls offer excellent wear resistance, high toughness, and strong biting capability under demanding rolling conditions.

Different forged roll grades are designed according to different mill applications and operating conditions. The optimized alloy composition and heat treatment process ensure reliable performance, stable hardness distribution, and long service life for hot rolling operations.

Chemical Composition

Symbol C Si Mn Cr Ni Mo V W
FSH-1 0.55-0.65 0.17-0.40 0.50-1.00 0.50-1.20 ≤0.25 0.20-0.40 - -
FSH-2 0.55-0.65 0.20-0.40 0.60-1.00 - 0.10-0.30 0.10-0.30 - -
FSH-3 0.45-0.65 0.20-0.50 0.50-0.90 3.00-3.60 - 0.40-1.20 0.10-0.35 -
FSH-4 0.60-0.80 0.30-0.80 0.40-0.90 2.50-3.50 0.40-0.50 0.20-0.60 - -
FSH-5 0.30-0.40 ≤0.40 ≤0.40 2.20-2.70 - - 0.20-0.50 7.50-9.00
FSH-6 0.32-0.43 0.80-1.20 0.20-0.50 4.50-5.50 - 1.00-1.60 0.30-0.60 -
FSH-7 0.80-0.95 0.25-0.45 0.20-0.55 1.70-2.40 - 0.20-0.40 ≤0.15 -

Barrel Hardness (HS)

Hardness FSH-1 FSH-2 FSH-3 FSH-4 FSH-5 FSH-6 FSH-7
Barrel 34-40 35-45 50-60 34-45 65-76 50-58 69-76
Surface 55-75 50-60 60-70 60-75 80-87 65-71 80-87

Product Features

  • Excellent wear resistance and stable hardness performance.
  • High toughness and strong biting capability for hot rolling applications.
  • Different forged grades available for various rolling mill requirements.
  • Suitable for plate mills, tube mills, planetary mills, and non-ferrous rolling lines.
  • Advanced heat treatment technology ensures reliable service life.

Recommended Applications

Mill Type Roll Type Forged Roll for Hot Mills
1 2 3 4 5 6 7
Plate mills Primary rolls ● ●
Planetary mills Work rolls ●
Feed rolls ●
Back up rolls ●
Welding tube mills Forming, sizing and vertical rolls ●
Seamless tube mills Extruding rolls ● ●
Straightening rolls ●
Non-ferrous plate and strip mills Piercing rolls ●
Pushing point rolls ●
Work rolls ● ●
Back up rolls ● ●

The good performance of Lonsun rolls thanks to the high and homogeneous hardness in the work layer with superior wear ability, high toughness and excellence resistance to accident, and the depth of hardness layer may be over 30mm.