Engineered to survive extreme thermomechanical stresses, DURON’s High-Nickel Bainitic Acicular SG Rolls (Special SGA) represent the absolute peak of high-alloy ductile iron engineering. Developed specifically to eliminate vulnerabilities in traditional mill setups, these specialized spinning castings are formulated with an elevated Nickel (Ni) content alongside optimized Molybdenum additions.
This sophisticated chemical formulation suppresses unwanted soft phases during cooling, ensuring a pure needle-like matrix throughout the working layer. Consequently, our elite Special SGA Rolls deliver unparalleled profile stability and high fatigue resistance across high-speed section and long product campaigns. Implementing this premium solution drastically curbs unexpected mill accidents and secures an immaculate surface finish for global steel manufacturers.
### Chemical Composition & Physical Properties DURON’s High-Nickel Bainitic Acicular SG Rolls represent the absolute pinnacle of ductile iron roll technology. By maintaining a high-alloy balance of Nickel and Molybdenum combined with precise centrifugal multi-pouring processes, these specialized tools minimize rolling accidents and support exceptional surface finish consistency. | Grade | C (%) | Si (%) | Mn (%) | P (%) | S (%) | Cr (%) | Ni (%) | Mo (%) | Mg (%) | Hardness (HSD) | Tensile (N/mm²) | | :— | :— | :— | :— | :— | :— | :— | :— | :— | :— | :— | :— | | **Special SGA** | 3.10-3.60 | 1.20-2.00 | 0.50-0.80 | ≤ 0.10 | ≤ 0.03 | 0.40-0.60 | **3.50-4.50** | **0.60-1.00** | ≥ 0.04 | **60-80** | ≥ 350 | *Metallurgical Highlight: The unique 3.5%–4.5% Ni formulation suppresses pearlitic transformations during cooling, securing a homogeneous bainitic-martensitic shell matrix reinforced with high-density alloyed carbides to withstand severe mechanical impacts.*
