Material Grade: AS651, AS70, AS701, AS7011, AS75, AS751

Blooming, Slabbing & Scale-Breaking Alloy Cast Steel Rolls (AS Series)

Engineered to withstand the most intense mechanical impacts in primary rolling stages. The AS series utilizes a carbon-balanced alloy steel matrix, delivering the exceptional fracture toughness and deep-pass structural integrity required for blooming, slabbing, and heavy-duty roughing stands.

By Material

By Application

By Tooling

Key Mill Applications (Recommended Stands)

Heavy Blooming, Slabbing & Breakdown Mills

Applicable Grades: AS75, AS751

Focus: Engineered for breakdown stands, slab blooming mills, and universal rail/beam mills. Provides extreme structural strength and fracture toughness to endure heavy reduction and massive shock loads during initial steel shaping.

Scale-Breaking & Hot Strip Roughing Stands

Applicable Grades: AS70, AS701, AS7011

Focus: Optimized for scale-breaker rolls, roughing work rolls, and middle-plate roughers. Successfully resists severe thermal shock and mechanical fatigue, preventing roll neck breakage while effectively stripping primary mill scale.

Strip Backup Rolls & Vertical Edging Stands

Applicable Grades: AS651, AS70, AS7011

Focus: Designed for strip mill backup rolls, vertical edging stands, and medium/small section roughing. The stable alloy structure delivers an excellent uniform hardness depth, perfectly supporting working rolls and controlling structural flange width.

Chemical Composition & Physical Properties

DURON’s Alloy Cast Steel Rolls (AS Series) are metallurgically formulated to withstand severe thermal fatigue and mechanical stress. We monitor the Carbon and Manganese ratios to achieve a stable balance between core toughness and surface structural durability under continuous temperature fluctuations. By incorporating targeted alloy additions, these specialized alloy cast steel rolls support consistent performance and operational safety in breakdown mill stands. The chemical compositions and metallurgical parameters for these alloy cast steel rolls are detailed below:

Code	C	Si	Mn	Cr	Ni	Mo	Hardness (HSD)
AS651	0.60-0.70	0.20-0.60	0.50-0.80	0.80-1.20	0.20-0.50	0.20-0.45	35-45
AS70	0.65-0.75	0.20-0.45	0.90-1.20	–	–	–	32-42
AS701	0.65-0.75	0.60-1.30	1.40-1.80	–	–	–	35-45
AS7011	0.65-0.75	0.20-0.45	1.40-1.80	–	–	0.20-0.45	35-45
AS75	0.70-0.80	0.20-0.45	0.60-0.90	0.75-1.00	–	0.20-0.45	35-50
AS751	0.70-0.80	0.20-0.70	0.70-1.10	0.80-1.50	≥ 0.20	0.20-0.60	35-50

* Note: P ≤ 0.035, S ≤ 0.030 for all AS series grades.

Metallurgical Excellence

Why Choose DURON Alloy Cast Steel Rolls for Breakdown Stands?

Superior Fracture Toughness : The alloy steel matrix is specifically heat-treated to resist crack initiation under high mechanical loads. This helps to prevent roll breakage even when subjected to the intense biting shocks typical of blooming and primary reduction stands.
Enhanced Thermal Stability : By optimizing the Chromium and Manganese content, our AS rolls maintain their structural integrity throughout repeated thermal cycling, significantly reducing the depth of thermal fatigue cracks during heavy roughing.
Uniform Wear Across Deep Profiles : Engineered for section and profile mills, the AS series provides consistent wear resistance throughout the deep pass grooves, helping to maintain strict product tolerances and reducing the frequency of pass dressing.
For optimized line synergy in section and wire rod mills, these heavy-duty AS series breakdown rolls are frequently deployed in tandem with our high-strength Pearlitic Nodular Iron Rolls in the downstream roughing stands or wear-resistant Acicular Nodular Iron Rolls in the intermediate stands to balance total campaign life.

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.