Material Composition Range
- Carbon content: 1.2–2.3%.
- The main alloying elements are: chromium (Cr), nickel (Ni), vanadium (V), and molybdenum (Mo).
- Hardness stability: Under a high-temperature environment of 800°C, the fluctuation of Rockwell hardness is controlled within ±1.5 HSD.
- Wear resistance comparison: It is claimed to be approximately 42% higher than traditional cast iron rolls (the original text does not specify the comparison benchmark).
Manufacturing Process and Structural Features
Forming Method: Integral Casting (Non-composite Roll), Avoiding Interface Bonding Defects.
Grain size: 15–25 μm.
Impact toughness (ak): 35–45 J/cm².
Surface flaking rate: When processing the sharp edges of H-shaped steel, ≤ 0.03 mm per thousand tons.
Centrifugal Casting Process Parameters
Centrifugal speed: 3000 r/min.
Structural form: Outer layer of high-carbon semi-steel + inner layer of graphite steel, forming a 0.5–0.8 mm gradient transition layer.
Uniformity of stress distribution: Improved by approximately 27% under a rolling force of 2500 MPa.
Application Case (quoted from the original text):
When rolling 60 kg/m heavy rails, the roller consumption per ton of steel was reduced from 0.8 kg to 0.45 kg.
Quality Control Indicators
- Non-metallic inclusions: ≤0.05% (volume ratio or mass ratio, the unit is not specified in the original text).
- Vacuum degassing + electromagnetic stirring: used to reduce inclusions.
- Internal defect size: ≤ φ0.2 mm after high-temperature diffusion annealing.
- Ultrasonic flaw detection pass rate: 99.6%.
Typical Application Scenarios (Original Case References)
- Application Manufacturer Roller Type Performance.
- Laigang Adamite Work Roll Single pass steel billet volume up to 150,000 tons.
- Shagang Composite Support Roll Service life exceeds 8 months.
- Various production lines Roughing Roll (φ850 mm).
- Side Roll (φ1400 mm) Covering 12 types of steel grades.
- Hardness gradient control capability up to 0.5 HSD/cm.
Technical Limitations
Applicable conditions: Mainly used in hot-rolled sections, rails and beams, medium and heavy plates, etc. Limited applicability to cold rolling or high-speed wire rod rolling mills with large impact loads.
Compared with high-chromium cast iron or high-speed steel rolls, Adamite rolls may not have an edge in extreme wear resistance or red hardness, but they have better thermal crack resistance and toughness.
Overall casting limitations: The manufacturing difficulty and cost of large-diameter or complex hole-shaped rolls increase.