Material Grade: SGA I, SGA II

Blooming, Section & Wire Rod Mill Acicular (Bainitic) Nodular Cast Iron Rolls (SGA Series)

Engineered for maximum durability in high-load finishing applications. The SGA series features a refined acicular (bainitic) matrix reinforced with alloy carbides, delivering a superior hardness-to-toughness ratio that significantly minimizes surface spalling and maintains pass shape stability under severe rolling conditions.

By Material

By Application

By Tooling

Key Mill Applications (Recommended Stands)

Blooming & Heavy Section Mills

Grades: SGA I, SGA II

Focus: Engineered for breakdown & roughing stands ( $\le\Phi 1000\text{mm}$ ). High tensile strength prevents breakage under massive reduction and severe impact.

Wire Rod & Continuous Bar Mills (Roughing & Intermediate Stands)

Grades: SGA II

Focus: Designed for high-wear roughing and pre-finishing stands. Resists thermal fatigue and maintains precise pass profiles before high-speed finishing.

Narrow Strip & Medium Plate Mills

Grades: SGA I

Focus: Ideal for work rolls in strip and small plate reversing mills. Prevents spalling and micro-cracking to secure flawless surface flatness.

Chemical Composition & Physical Properties

Code	C	Si	Mn	Cr	Ni	Mo	Hardness (HSD)	Tensile Strength (N/mm²)
SGA I	2.9-3.6	1.2-2.2	0.2-0.8	0.2-1.0	3.0-3.5	0.5-1.0	55-78	≥ 350
SGA II	2.9-3.6	1.0-2.0	0.2-0.8	0.3-1.5	3.5-4.5	0.5-1.0	60-80	≥ 350

Metallurgical Excellence

Why do DURON SGA Series rolls excel in high-performance finishing?

Acicular Matrix Stability: The strategically alloyed bainitic matrix provides higher hot-hardness compared to standard pearlitic rolls. This microstructure effectively reduces the depth of thermal cracks and mitigates the risk of catastrophic surface spalling.
Enhanced Fatigue Resistance: Through advanced centrifugal casting, the wear-resistant working layer is metallurgically bonded to a high-strength core. This composite structure supports higher rolling loads while maintaining structural integrity during rapid cooling cycles.
Optimized Surface Retention: The uniform distribution of secondary carbides ensures consistent wear throughout the roll’s campaign life, helping to maintain pass shape accuracy and delivering the superior surface finish required for premium steel products.

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.