Audited Supplier
Nodular irons belong to a group of cast iron in which most of the carbon crystallizes as spherical particles known as graphite nodules. Wide range
of properties may be obtained by adjusting the three major alloying elements: Cr, Ni and Mo.
The low nickel grade (FerriticIron) provides optimal hardness with high strength and toughness. The medium nickel grade (Pearlitic Iron) has higher surface hardness necessary for intermediate and finishing. High nickel and molybdenum grade (Bainitic/Acicular Iron) provide excellent mechanical properties at high working temperature in terms of strength, toughness, and hardness.
Nodular cast iron is the most common roll grade in hot rolling of billets, sections, bar and wire rod, narrow strip and seamless tube. Pearlitic iron rolls with additional Cr content can give better hardness penetration that is suitable for rolling sections with deep grooves.
Rolls from these grades can be produced by static or centrifugal casting.
| MATERIAL | GRADE | CHEMISTRY | Barrel Hardness | ||||||||
| C | Si | Mn | P | S | Cr | Ni | Mo | Mg | (HSD) | ||
| Spheroidal Graphite | SG | 2.9-3.6 | 0.8-2.5 | 0.4-1.2 | ≤0.25 | ≤0.03 | 0.2-1.6 | - | 0.2-0.6 | ≥0.04 | 50-70 |
| SG II | 2.9-3.6 | 0.8-2.5 | 0.4-1.2 | ≤0.25 | ≤0.03 | 0.2-1.6 | 0.5-1.0 | 0.2-0.8 | ≥0.04 | 50-65 | |
| SG III | 2.9-3.6 | 0.8-2.5 | 0.4-1.2 | ≤0.2 | ≤0.03 | 0.3-1.2 | 1.01-1.5 | 0.2-0.8 | ≥0.04 | 55-70 | |
Seawoo Roll assures high quality products through an extensive system of quality controls. A number of rigid inspections are carried out for each and every step in the process of our production line. Every set of inspection equipment has to go through high accuracy calibration to guarantee effectiveness of inspection data.
• Scrap and other raw materials are verified so that they meet stringent specifications.
• All melting parameters are analyzed.
• Casting parameters are documented.
• Heating parameters are monitored during the heat treatment process.
• Hardness and internal soundness are checked after the heat treatment process has been carried out.
• Dimensions and final hardness results are checked before shipment.
• An examination to detect freedom of surface and internal cracks is carried out before shipment.
• All results are documented in accordance with our Quality Management System.
| LONG PRODUCT (LP) MILL ROLLS | ||
| MILL TYPE | ROLL TYPE | ROLL GRADE |
| BAR MILL | Roughing, Intermediate,Finishing | Cast Steel, Adamite Steel, Nodular lron, HSSTC in ring roll form |
| WIRE ROD MILL | Roughing,intermediate,Finishing, Finishing Block | Cast Steel, Adamite Steel Nodular lron, HSSCemented Carbide |
| SECTION MILL | Breakdown. RoughingIntermediate, Finishing | Cast Steel, Adamite Steel, Graphitic SteelNodular lron |
| HEAVY SECTION MILL | Breakdown,Roughing, Edger,Tandem, UF, UR, Straightening | Cast Steel, Adamite Steel, Graphitic SteelHiCr lron, HiCr Steel, Forged Steel |
| FLAT PRODUCT (FP) MILL ROLLS | ||
| MILL TYPE | ROLL TYPE | ROLL GRADE |
| HSM, Plate | Roughing WR | Special Alloy Cast Steel, HiCrSteel SemiHSS |
| HSM | Roughing & Finishing BUR | Duplex Cast Steel, Forged Stee! |
| HSM | F1-F4, F5-F7 WR | Hi Cr lron, ICDP HSS |
| CSM | Tandem, Reversible,Sendzimir WR | Cr3, Cr4, Cr5 Forged Steel |
| CSM | BUR | Cr3, Cr4, Cr5 Forged Steel/Duplex Cast Steel |
