Forged Steel Grinding Ball 140mm (SAG Mills)
Heavy-duty 140mm forged alloy steel grinding balls engineered specifically for high-impact Semi-Autogenous Grinding (SAG) mills in mega copper and gold concentrators.
Chemical Composition Matrix (% wt)
| C | Mn | Cr | Si | P/S |
|---|---|---|---|---|
| 0.60-0.75% | 0.75-1.10% | 0.50-0.80% | 0.20-0.35% | < 0.025% |
Technical Overview & Comminution Engineering
Manufactured from high-grade hot-rolled alloy round steel bars (B2/B3 chemistry with specialized Cr-Mn-Mo alloying), Grindball Isfahan’s 140mm Forged Steel Grinding Media represents the pinnacle of impact resistance and fracture toughness for extreme milling duties.
Designed for massive SAG mills operating with ball charges up to 18-20% and top sizes capable of shattering 250mm feed rock, this ball sustains catastrophic drop energies without micro-spalling or catastrophic shell cleavage.
Key Performance Benefits in Autogenous Milling
- Zero Catastrophic Fracture: Impact fatigue toughness exceeding > 14 J/cm² eliminates dangerous in-mill fractures that cause shell liner gouging and discharge grate slot blockages.
- Uniform Volumetric Hardness: Automated multi-stage spiral water-polymer spray quench system ensures a shallow hardness gradient—maintaining at least 56 HRC at the geometric core while reaching 60–63 HRC on the working surface.
- Sustained Sphericity Under Impact: Asymmetrical deformation and flat-spotting are suppressed, maintaining maximum grinding contact surface area throughout the wear lifecycle.
- Low Specific Consumption: Verified operational consumption in high-tonnage porphyry copper operations is consistently below 0.42 kg/t of treated ore.
Quality Assurance & Verification Testing (QA/QC)
Every production heat is subject to rigorous metallurgical and mechanical verification:
- Drop-Ball Fatigue Test: Withstands over 15,000 continuous impacts from a 6.0-meter drop tower onto a hardened concave anvil.
- Ultrasonic Flaw Inspection (UT): Comprehensive axial scanning to verify the complete absence of center-line shrinkage cavities and internal micro-cracking.
- Optical Emission Spectroscopy (OES): Batch-by-batch chemistry verification with calibrated spectral analysis.
- Mill Test Certificate (MTC): EN 10204 3.1 compliant test certification accompanying every rail wagon and export truck.
Global Logistics & Cross-Border Delivery
Strategically based in the central logistics corridor of Isfahan with direct rail connectivity and major highway arteries:
- Central Asia (Kazakhstan & Uzbekistan): Shipped via Incheh Borun / Sarakhs rail interchange with direct transshipment to broad-gauge 1520mm wagons.
- Caucasus (Armenia & Georgia): 24–48 hour direct transit via Norduz border.
- Turkey & Levant: Rapid cross-border logistics via Bazargan / Razi border crossings.
- Seaborne Worldwide: FOB Bandar Abbas containerized or bulk vessel charter.
Target Mill Applications
Direct Mill Quotation
Inquire directly with Export Directorate for CFR / CPT freight rates, test batches, or long-term supply contracts.
💬Instant WhatsApp RFQ (+989133773280)Direct Line: +98 913 377 3280Standards & Packaging
1-Ton Reinforced UV-Resistant Jumbo Bags / 850kg Steel Drums on Pallets
Iran, Isfahan, Jey Industrial City, Co. No. 6782
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