High Chrome Grinding Balls
Grinding Media · High-Chrome Series

Engineering the Ball That Outlasts Your Ore

High-chromium grinding media engineered for maximum hardness retention, minimum breakage, and measurable reductions in your cost-per-ton. Every batch cleared through the Alliance 21-Point Quality Protocol — before it ships.

Chrome Content

:10%–28% Cr

Diameter Range

: Ø20mm – Ø150mm

Hardness

: 58–66 HRC

Breakage Rate

: ≤0.5%

02 // Technical Data

Technical Specifications

Parameter Value Notes
Chrome Content :10%–28% Cr Customized to ore hardness profile
Diameter Ø20mm – Ø150mm Custom sizes on request
Surface Hardness 58 – 66 HRC Verified by Rockwell mapping
Core Hardness ≥ 55 HRC Cross-section verified per batch
Impact Value ≥ 4.0J/cm²
Breakage Rate ≤ 0.5% World-class benchmark
Microstructure Martensite / Pearlite Controlled by heat treatment protocol
Heat Treatment Quench + Temper Quench + Temper

very ore body is different. We conduct a pre-project metallurgical consultation to determine the optimal chrome grade, ball diameter, and charge ratio for your specific mill and ore type. This is not a catalogue — it's a matched system.

03 // Where It Works

Application Guide

Gold & Copper Mining

Optimised hardness profiles for SAG and ball mill circuits processing hard-rock sulphide ores with high abrasion indices.

Iron Ore Processing

High-chrome formulations engineered for corrosive slurry environments typical in magnetite and hematite beneficiation circuits.

Cement Grinding

Consistent density and roundness tolerances reduce energy consumption and extend liner service life in closed-circuit cement mills.

Lithium & Battery Materials

Ultra-low contamination alloys qualified for lithium spodumene and battery-grade mineral processing applications.

Technical Notes

THE METALLURGICAL CASE

Why Chrome Content Is Not Enough.

Most suppliers sell chromium percentage. We engineer the complete metallurgical profile — because a high-chrome ball that hasn’t been through the correct thermal cycle will perform no better than a mid-grade forged ball. The difference between a 60 HRC result and a 55 HRC result is entirely determined by the quench and temper curve, not the alloy specification.

Our founder designed the heat treatment protocols that passed the rigorous technical audits of HKEX-listed global mining giants and Swiss-based industrial mineral leaders. Those exact protocols govern every batch we produce today.

Three-Column Differentiators:

Column 1 — Alloy Precision We specify chrome content, carbon ratios, and trace element limits to the second decimal place. Alloy chemistry is verified via portable OES spectrometry — independently, on the factory floor — before and after heat treatment.

Column 2 — Thermal Discipline Every heat treatment run is monitored in real-time. We record quench curve gradients, soaking temperatures, and tempering durations by batch. A deviation of even 5°C from the approved curve triggers a quarantine — not a conversation.

Column 3 — Hardness Mapping We don’t test one ball per batch. We produce a full Rockwell hardness map across sampled units — surface and cross-section — to verify that the hardness profile holds through the core. Surface-hard, soft-core balls are a common failure mode we eliminate by design.

 

04 // Quality Assurance

Your Assurance. Not Ours.

When you buy directly from a factory, you rely on that factory's internal QC. When you buy through Alliance, you have a second, independent quality authority that has no financial interest in passing a bad batch.

01

Pre-Production

  • Alloy chemistry verification (OES Spectrometry)
  • Raw material source traceability confirmation
  • Heat treatment protocol sign-off
02

In-Process

  • Real-time quench curve monitoring
  • Temper temperature verification
  • In-process dimensional sampling
03

Pre-Shipment

  • Final hardness mapping (Rockwell HRC — surface + cross-section)
  • CMM dimensional verification (diameter tolerance, roundness)
  • Impact resistance test per batch
  • Packaging integrity inspection
  • Full batch traceability report issued

Protocol: Alliance 21-Point Quality Protocol

05 // Track Record

Numbers That Come From Mines, Not Brochures.

0.5%

— Breakage rate

consistently achieved in Tier-1 mine trials. Industry average exceeds 2%.

3,000+ tons

— Annual export volume

managed under the same protocols that earned HKEX-listed client approval.

3-Year LTA

— Grinding media supplied

without interruption for a West Africa Tier-1 Lithium project across 1,000+ consecutive days.

Ready to Run the Numbers on Your Operation?

Submit your mill type, ore hardness profile, and current media consumption. We'll return a matched specification and cost-per-ton projection — no generic catalogue, no guesswork.

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