Material Grade: CC II / CC III / CC IV

Section, Wire Rod & Skin Pass Mill Ni-Cr-Mo Chilled Cast Iron Rolls (NICCI Rolls)

Name: Section, Wire Rod & Skin Pass Mill Ni-Cr-Mo Chilled Cast Iron Rolls (NICCI Rolls)
Brand: DURON

Engineered for exceptional wear resistance and thermal stability, DURON’s Chilled Cast Iron Rolls (CC Series) utilize a precisely alloyed Nickel-Chromium-Molybdenum (Ni-Cr-Mo) white iron working layer. As a dedicated metallurgical roll manufacturer, we deliver a high and uniform hardness gradient across the working layer, making these chilled cast iron rolls the optimal solution for high-speed finishing applications.

By Material

By Application

By Tooling

Key Mill Applications (Recommended Stands)

Small Section Mills

Offers excellent wear resistance for finishing stands, ensuring high surface quality and precise dimensional accuracy for section steel profiles.

High-Speed Wire Rod Mills

Provides exceptional thermal stability and uniform hardness to maintain tight tolerances and pass shape stability during high-speed wire rod rolling.

Hot-Rolled Sheet Temper Mills

The dense white iron matrix minimizes surface defects, delivering a flawless finish that is crucial for hot-rolled temper rolling operations.

Chemical Composition & Physical Properties

DURON Ni-Cr-Mo Chilled Cast Iron Rolls (NICCI Rolls) are engineered for section, wire rod, and skin pass mills.We precisely control the ratio of alloying elements like Chromium (Cr), Nickel (Ni), and Molybdenum (Mo) to ensure a dense white iron matrix.

Key Specifications of DURON Chilled Cast Iron Rolls

Material Category	Code	C	Si	Mn	P	S	Cr	Ni	Mo	Hardness (HSD)	Tensile Strength (N/mm²)
Ni-Cr-Mo Chilled Iron	CC II	2.90~3.60	0.25~0.80	0.20~1.00	≤ 0.40	≤ 0.08	0.30~1.20	1.01~2.00	0.20~0.60	62~75	≥ 150
Ni-Cr-Mo Chilled Centrifugal	CC III	2.90~3.60	0.25~0.80	0.20~1.00	≤ 0.40	≤ 0.08	0.50~1.50	2.01~3.00	0.20~0.60	65~80	≥ 350
Ni-Cr-Mo Chilled Centrifugal	CC IV	2.90~3.60	0.25~0.80	0.20~1.00	≤ 0.40	≤ 0.08	0.50~1.70	3.01~4.50	0.20~0.60	70~85	≥ 350

Rolling Train Layout Note: For complete continuous mill setups, we recommend pairing our CC series finishing rolls with DURON Adamite Rolls in the roughing stands and high-vanadium High-Speed Steel Rolls in the intermediate stands to ensure synchronized wear cycles across the entire line.

Metallurgical Excellence

Why Choose DURON Chilled Cast Iron Rolls for Finishing Operations?

Optimized Ni-Cr-Mo Alloying: The strategic addition of Nickel (up to 4.50% in CC IV grade) and Molybdenum refines the carbide structure within our chilled cast iron rolls. This metallurgical precision effectively mitigates thermal fatigue and increases resistance to micro-spalling during high-speed rolling.

Uniform Chill Depth: Controlled cooling rates during the casting process promote a dense working layer with a minimal hardness drop, supporting consistent rolling performance and helping to maintain tight tolerances over an extended campaign life.

Centrifugal Composite Strength (CC III & IV): By utilizing advanced centrifugal casting, the highly wear-resistant alloyed outer shell of these chilled cast iron rolls is metallurgically fused to a tough nodular iron core, achieving a tensile strength of $\ge \text{350 N/mm}^2$ to maximize structural reliability and significantly reduce the risk of roll breakage under heavy bite impacts.

Manufacturing Control & Inspection

100% Non-Destructive Testing

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.

Precision CNC Machining

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.

Metallurgical Verification

Chemical compositions are analyzed via spectrometer pre-pouring, and multi-point hardness mapping is conducted post-heat treatment to guarantee the specified hardness gradient.

Quality Traceability

All dispatched rolls are accompanied by a comprehensive inspection certificate, documenting chemical composition, hardness distribution, and UT reports.