Acicular Nodular Cast Iron Rolls, also known as SGA rolls, are alloyed with Nickel, Manganese, and Chromium, featuring a bainitic-acicular-martensitic matrix structure. Compared with standard SGP rolls, SGA rolls provide higher tensile strength, hardness, wear resistance, and improved resistance to fire-cracking.
The advanced heat treatment process ensures a stable acicular matrix structure and reliable rolling performance under demanding working conditions. SGA rolls can be produced by static casting (Monoblock) or by centrifugal double-pour casting methods. They are widely used for roughing stands in bar and rebar mills.
Chemical Composition
| Symbol | C | Si | Mn | Cr | Ni | Mo | Mg |
| SGA I | 2.90-3.60 | 1.20-2.20 | 0.20-0.80 | 0.20-1.00 | 3.01-3.50 | 0.50-1.00 | ≥0.04 |
| SGA II | 2.90-3.60 | 1.00-2.00 | 0.20-0.80 | 0.30-1.50 | 3.51-4.50 | 0.50-1.00 | ≥0.04 |
Physical Properties
| Symbol | Barrel Hardness | Roll Neck Hardness | Tensile Strength △ |
| SGA I | 55-78 HS | 35-45 HS | ≥350/450 MPa |
| SGA II | 60-80 HS | 35-45 HS | ≥350/450 MPa |
Recommended Applications
- Rolls for intermediate and finishing stands of medium section mills, bar mills, and wire mills.
- Rolls for forming, sizing, reducing, and straightening stands of pipe and tube mills.
- Rolls for sleeves of universal stands.
Product Features
- Bainitic-acicular-martensitic matrix structure with excellent toughness.
- Higher hardness and wear resistance compared with standard SGP rolls.
- Excellent resistance to thermal cracking and heavy rolling conditions.
- Suitable for bar mills, rebar mills, section mills, and pipe mills.