Material Grade: S-HSS

Hot Roughing & Cold Mill Rolls Semi-High Speed Steel Roughing Rolls (S-HSS)

Engineered to bridge the gap between high fracture toughness and advanced wear resistance. The S-HSS series utilizes a modified carbon and alloy matrix to provide reliable impact resistance during primary reductions, while offering notably improved wear performance compared to traditional high-chrome or cast steel roughing rolls.

By Material

By Application

By Tooling

Key Mill Applications (Recommended Stands)

Hot Strip Mill Heavy Roughing

Tailored for early-stage roughing work rolls in hot strip mills. Provides an optimal balance of high hardness and superior thermal shock resistance, flawlessly preventing deep thermal cracking and roll surface spalling under continuous heavy reduction.

Cold Strip Mill Work Rolls

Engineered for high-load work rolls in cold rolling trains and reversing strip mills. Exceptional surface texturing retention and high wear resistance ensure long-term consistent strip thickness and an unblemished metal finish.

Cold Rolling Intermediate Stands

Designed as premium intermediate rolls in 4-Hi / 6-Hi cold rolling mills. Outstanding mechanical toughness and anti-incident capability efficiently absorb severe peak stresses, eliminating roll bruising or catastrophic localized weld-sticking during accidental strip breakage.

Chemical Composition & Physical Properties

By carefully calibrating the levels of Carbon, Vanadium, and Niobium, we achieve a microstructure that balances toughness with secondary hardening capabilities. The exact metallurgical specifications for the S-HSS grade are detailed below:

Code (代码)	C	Si	Mn	Cr	Ni	Mo	V	Nb	Barrel (HSD)
S-HSS	0.60-1.20	0.80-1.50	0.50-1.00	3.00-9.00	0.20-1.20	2.00-5.00	0.40-3.00	0.00-3.00	75-98

* P ≤ 0.030, S ≤ 0.025 to ensure matrix integrity.
* Neck Hardness: 30-45 HSD for reliable torque transmission.

Metallurgical Excellence

Why does the DURON S-HSS roll provide a dependable roughing upgrade?

Optimized Impact Resistance: Compared to standard HSS, the reduced carbon content (0.60-1.20%) forms a tougher matrix. This modification helps prevent crack propagation under high mechanical loads, making the roll highly suitable for the biting impacts typical in roughing stands.
Enhanced Wear Performance : The inclusion of Chromium, Molybdenum, and Vanadium still allows for the precipitation of protective carbides. This structure assists in maintaining surface integrity for longer periods than conventional cast steel or high-chrome roughing rolls, supporting extended campaign times.
Improved Thermal Stability: The alloy formulation provides reliable hot-hardness and thermal conductivity. This combination aids in managing the intense heat transfer from thick slabs, helping to mitigate the depth of thermal fatigue cracks during heavy reductions.

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.