Material Grade: SGP I, SGP II, SGP III

Blooming, Section & Wire Rod Mill Pearlitic Nodular Iron Rolls (SGP Rolls)

Engineered for heavy-duty applications requiring exceptional structural integrity and deep pass durability. The SGP series features a stable pearlitic matrix with spheroidal graphite, providing high tensile strength and superior resistance to thermal cracking and mechanical impact in roughing and blooming stands.
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Nodular cast iron mill roll for hot rolling applications

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Key Mill Applications (Recommended Stands)

Blooming & Heavy Section Mills

Grades: SGP I, SGP II

Focus: Tailored for roughing stands ($\le\Phi 1000\text{mm}$). Exceptional thermal shock resistance and high biting capability eliminate slippage.

Wire Rod & Bar Mills (Roughing & Intermediate Stands)

Grades: SGP II, SGP III

Focus: Optimized for intense thermal cycling stands. Minimal hardness drop throughout the roll body ensures stable, long-campaign rolling.

Narrow Strip & Section Flange Rolling

Grades: SGP I

Focus: Designed for strip and complex section profiles. Uniform wear characteristics perfectly protect pass flanges and strip thickness.

Chemical Composition & Physical Properties

Engineered for heavy-duty applications requiring exceptional structural integrity, DURON’s Pearlitic Nodular Iron Rolls (SGP Rolls) feature a stable pearlitic matrix with spheroidal graphite. This metallurgical precision provides high tensile strength, deep pass durability, and superior resistance to thermal cracking and mechanical impact. We optimize the pearlite transformation through precise control of alloying elements to ensure consistent performance from the roll surface to the core. The chemical compositions and metallurgical specifications for these pearlitic nodular iron rolls are detailed below:

Code C Si Mn Cr Ni Mo Hardness (HSD) Tensile (N/mm²)
SGP I 2.90-3.60 1.40-2.20 0.40-1.00 ≤ 0.10 1.50-2.00 0.20-0.80 45-55 ≥ 450
SGP II 2.90-3.60 1.20-2.20 0.40-1.00 0.20-0.60 2.01-2.50 0.20-0.80 55-65
SGP III 2.90-3.60 1.00-2.00 0.40-1.00 0.20-0.60 2.51-3.00 0.20-0.80 62-72

Metallurgical Excellence

Why Choose DURON Pearlitic Nodular Iron Rolls for Roughing Stands?

  • Exceptional Mechanical Toughness : The spheroidal graphite distribution acts as a natural buffer against crack propagation. This provides a high safety margin against roll breakage, which is vital for roughing stands subjected to intense bite impacts.

  • Deep Pass Wear Consistency : The pearlite matrix ensures that hardness does not drop significantly even in the deepest parts of the pass profile. This helps to maintain the profile integrity and reduces the need for frequent dressing or pass changes.

  • High Thermal Conductivity: Compared to high-alloy finishing rolls, SGP material exhibits better thermal conductivity. This feature effectively aids in heat dissipation during heavy-load cycles, significantly reducing the risk of deep thermal cracks (fire crazing).

  • Multi-Stand Material Integration: For optimized mill productivity, we recommend aligning these heavy-duty SGP roughing rolls with our wear-resistant Indefinite Chilled Rolls or high-alloy Acicular Nodular Iron Rolls in the downstream intermediate and finishing 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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