Material Grade: HSS

High-Hardness Hot Strip & High-Speed Wire Rod Mill High Speed Steel Rolls (HSS)

Engineered for top-tier wear resistance and thermal stability in high-speed finishing operations. The HSS roll features a highly alloyed matrix enriched with Vanadium, Niobium, and Molybdenum, promoting the precipitation of complex MC-type carbides. This advanced structure supports extended rolling campaigns and assists in maintaining premium surface quality for flat and long products.

By Material

By Application

By Tooling

Key Mill Applications (Recommended Stands)

Hot Strip Mill Finishing Trains

Specifically developed for the rigorous conditions of late-stage strip finishing. The superior hot-hardness helps to minimize surface degradation and maintains precise strip profile control, significantly reducing the frequency of roll changes.

High-Speed Wire Rod & Bar Finishing Stands

Tailored for pre-finishing trains in high-speed wire rod mills and finishing stands in rebar/bar lines. Successfully withstands severe mechanical abrasion and continuous high-velocity rolling friction, significantly extending mill availability.

Universal Stands for Section Profiles

Designed for finishing work rolls and horizontal/vertical rings in universal section mills. Minimal hardness drop throughout the usable body perfectly eliminates pass profile deviation, ensuring highly stable shapes for structural sections.

Chemical Composition & Physical Properties

The precise micro-alloying of Vanadium (V) and Niobium (Nb) alongside high Molybdenum (Mo) content acts as the core mechanism for MC-carbide formation. The exact metallurgical specifications for our HSS grade are detailed below:

Code (代码)	C	Si	Mn	Cr	Ni	Mo	V	Nb	Barrel (HSD)
HSS	1.50-2.20	0.30-1.00	0.40-1.20	3.00-8.00	0.00-1.50	2.00-8.00	2.00-9.00	0.00-8.00	75-95

* P ≤ 0.030, S ≤ 0.025 tightly controlled for high metallurgical purity.
* Neck Hardness: ≤ 45 HSD to ensure driving safety under high torque.

Metallurgical Excellence

Why do DURON High Speed Steel rolls deliver consistent finishing performance?

Complex MC-Type Carbides : The substantial addition of Vanadium, Niobium, and Molybdenum leads to the precipitation of extremely hard, discrete MC and M2C carbides. This specific structure provides exceptional wear resistance, exceeding that of traditional high-chrome or indefinite chill materials.
Maintained Hot-Hardness : Designed to operate in severe high-temperature environments, the highly alloyed matrix undergoes secondary hardening during heat treatment. This allows the roll surface to maintain its structural integrity and resist deformation even during prolonged contact with red-hot strip or wire.
Protective Secondary Oxide Film : During the hot rolling process, the HSS chemistry promotes the continuous formation of a thin, dense oxide layer. This film acts as an effective thermal barrier and solid lubricant, aiding in the prevention of strip sticking and reducing continuous surface friction.

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.