Engineered for work rolls in hot strip mills and medium-to-heavy plate mills . High-chromium carbides effectively resist thermal fatigue, oxidation, and severe surface wear under continuous hot rolling.
Tailored for universal mill rings and section mill stands. The centrifugal casting process ensures an excellent combination of core toughness and shell wear resistance, perfectly securing pass profile precision for structural steel.
Designed for temper/skin pass mills and vertical edging stands. Delivers superior anti-spalling performance to maintain an impeccable roll surface finish, while standing up to intense friction on edging roll pass flanks.
Our high chrome cast iron rolls are centrifugally cast to ensure a robust metallurgical bond. The exact alloying parameters, including critical additions of Vanadium (V), are detailed below:
| Code (代码) | C | Si | Mn | Cr | Ni | Mo | V | Hardness (硬度 HSD) | Tensile (抗拉 N/mm²) |
|---|---|---|---|---|---|---|---|---|---|
| HCr II | 2.90-3.30 | 0.30-1.00 | 0.50-1.20 | 15.01-20.00 | 0.70-2.90 | 0.70-2.90 | 0.00-0.60 | 65-80 | ≥ 350 |
| HCr III | 2.90-3.30 | 0.30-1.00 | 0.50-1.20 | 18.01-22.00 | 0.70-1.70 | 1.51-3.00 | 0.00-0.60 | 75-90 |
* Note: P ≤ 0.10%, S ≤ 0.05% strictly controlled for all grades.
Why do DURON HCr Series rolls deliver reliable performance?
High-Density Carbide Formation : With Chromium levels reaching up to 22%, the microstructure forms hard, discrete M7C3 eutectic carbides. This significantly enhances the roll’s ability to withstand severe abrasive wear in demanding applications. (随着
Secondary Hardening Effect : The strategic addition of Molybdenum and Vanadium promotes secondary hardening during heat treatment, ensuring the roll shell maintains an operating hardness of up to 90 HSD even under high thermal loads.
Centrifugal Composite Integrity : Manufactured via a centrifugal casting process, the highly alloyed wear shell is metallurgically bonded to a tough core (Tensile Strength ≥ 350 N/mm²), providing a balanced resistance to both surface spalling and core fatigue.
Every roll undergoes rigorous Ultrasonic Testing (UT) at the working layer and bonding zone to eliminate internal voids and ensure structural integrity under heavy loads.
Roll necks and barrel profiles are machined using heavy-duty CNC equipment, strictly adhering to your drawing's dimensional and runout tolerances for perfect bearing fitment.
Chemical compositions are analyzed via spectrometer pre-pouring, and multi-point hardness mapping is conducted post-heat treatment to guarantee the specified hardness gradient.
All dispatched rolls are accompanied by a comprehensive inspection certificate, documenting chemical composition, hardness distribution, and UT reports.
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