Bainitic Nodular Cast Iron Rolls
Bainitic Nodular Cast Iron Rolls
Bainitic Nodular Cast Iron Rolls are an advanced class of nodular cast iron rolls engineered to provide exceptional wear resistance, strength, and toughness. By carefully controlling the alloy content and heat treatment, these rolls develop a bainitic matrix with evenly distributed nodular graphite, delivering the perfect balance between hardness and durability.
Properties
| Material Name | Code | C | Si | Mn | P | S | Cr | Ni | Mo | V | Mg | Barrel Hardness (HSD) | Neck Hardness (HSD) | Recommended Application |
| Bainitic Nodular Cast Iron Roll I | SGA I | 2.90–3.60 | 1.20–2.20 | 0.20–0.80 | ≤0.10 | ≤0.03 | 0.20–1.00 | 3.01–3.50 | 0.50–1.00 | — | ≥0.04 | 55–78 | 32–45 | Square/bar/plate roughing rolls, section steel, railway roughing rolls, furnace rolls, Hot strip mill 2H rolls, strip steel work rolls, bar/rod mill rolls, seamless tube rolls |
| Bainitic Nodular Cast Iron Roll II | SGA II | 2.90–3.60 | 1.00–2.00 | 0.20–0.80 | ≤0.10 | ≤0.03 | 0.30–1.50 | 3.51–4.50 | 0.50–1.00 | — | ≥0.04 | 60–80 | 32–45 |
Key Features
- Matrix Structure: Bainitic matrix with spheroidal graphite, ensuring high strength and excellent crack resistance.
- Hardness Range: Typically 350–500 HB depending on section size and heat treatment.
- Wear Resistance: Enhanced surface hardness ensures long service life in demanding rolling conditions.
- Toughness: Maintains superior shock resistance compared with pearlitic or chilled iron rolls.
- Thermal Stability: Bainitic structure helps resist thermal fatigue and deformation during high-load operations.
Applications
Bainitic Nodular Cast Iron Rolls are widely used in mills that require both strength and resilience, such as:
- Roughing stands in hot strip mills
- Section mills and structural steel rolling
- Medium and small bar mills
- Plate and blooming mills
Advantages of Bainitic Nodular Cast Iron Rolls
- Outlasts pearlitic nodular rolls in terms of wear resistance.
- Greater toughness compared with indefinite chill rolls.
- Cost-efficient solution due to reduced downtime and extended roll campaigns.
Comparision between Bainitic and Pearlitic Nodular Rolls
| Feature | Bainitic Nodular Cast Iron Rolls | Pearlitic Nodular Cast Iron Rolls |
|---|---|---|
| Matrix Structure | Bainitic with nodular graphite | Pearlitic with nodular graphite |
| Hardness Range | 350–500 HB | 300–380 HB |
| Wear Resistance | Higher, suitable for heavy-duty applications | Moderate, suitable for medium-duty rolling |
| Toughness | Superior toughness and crack resistance | Good toughness, but lower than bainitic type |
| Thermal Stability | Excellent, resists thermal fatigue and deformation | Moderate, more prone to heat checking |
| Applications | Roughing stands, section mills, heavy bar mills | Finishing stands, light to medium section mills |
| Service Life | Longer campaign life under high-load conditions | Reliable under moderate conditions |
| Cost Efficiency | Higher initial cost, lower cost per ton due to durability | Lower initial cost, shorter life in heavy-duty mills |
Why Choose SATRAD GROUP?
At SATRAD GROUP, we combine metallurgical expertise with modern casting technology to deliver rolling mill rolls tailored to your mill’s specific needs. Our strict quality control and precision machining ensure every roll meets international standards for performance and reliability.
If you are looking for rolls that offer the ideal balance between hardness, toughness, and cost-effectiveness, Cast Iron Rolls from SATRAD GROUP are the solution. Contact our team today and discover how we can help optimize your rolling performance.
