Material Grade: S-HSS

Hot Strip Roughing Mill Semi-HSS Rolls (S-HSS Rolls)

Engineered to bridge the gap between fracture toughness and wear resistance, DURON’s S-HSS roughing rolls utilize a balanced alloy matrix to provide elite thermal shock and impact defense during heavy primary reductions in hot strip and section mills.
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DURON Semi-High Speed Steel (S-HSS) roughing work roll with a durable, precisely machined large-barrel surface and specialized journal design, engineered for high impact and wear resistance in hot strip mills.

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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.

Heavy Structural & Blooming Mills

Engineered for heavy-reduction blooming and roughing stands in structural and section lines. Delivers exceptional thermal shock resistance to prevent catastrophic mechanical fracture during high-torque slab cogging.

Bar & Wire Rod Primary Roughing Trains

Formulated for primary break-down and continuous roughing stands in high-tonnage wire rod and rebar mills, shielding roll grooves against severe mechanical impact tearing.

Chemical Composition & Physical Properties

DURON’s Semi-High Speed Steel Rolls (S-HSS Series) are engineered to support consistent performance and high surface durability. By carefully calibrating the levels of Carbon, Vanadium, and Niobium, we achieve a refined microstructure that balances structural toughness with secondary hardening capabilities under elevated temperatures. This controlled alloy balance allows these specialized semi-high speed steel rolls to resist severe mechanical wear and thermal cracking in heavy reduction stands. The chemical compositions and metallurgical specifications for these semi-high speed steel rolls 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 Choose DURON Semi-High Speed Steel Rolls for Roughing Stands?

  • 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.

  • Multi-Stand Material Integration: To synchronize wear performance across full continuous configurations, hot rolling mill operators often pairing these S-HSS roughing stands with our premium High Speed Steel Rolls for elite finishing positions or wear-resistant Indefinite Chilled Rolls for downstream intermediate stands.

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.

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