Heat-Treated Forged Steel Balls



GMSA offers a complete range of heat-treated grinding media solutions from forged steel to a range of cast high-chromium alloys.

GMSA offer the right product to suit different customer applications to minimise grinding costs.

Heat-Treated High Chrome Balls

Technical Support

GMSA is managed by Magotteaux International, a leader in the development and design of grinding media. This partnership ensures that our customers receive world class technical support and access to cutting edge grinding media technology. We offer help and guidance to customers, from selecting the best wear-resistant alloy, to assessing its impact on grinding chemistry and the subsequent beneficiation process.

Our technical support is divided into three steps: preparation, supplies and performance follow up.


Plant Audit

  • Understanding of production, maintenance, and commercial targets (e.g., recovery, wear rates, etc.)
  • Historical data collection and circuit surveys


  • Interaction between all operational parameters (e.g., ore hardness, feed size, product size, etc.)


  • Proposal of the right product for the application
  • Advice on mill operating conditions

Product development and Improvement

  • Continued optimization of ball chemistry and metallurgical structure to enhance ball grinding efficiency



  • Account Managers and Customer sales representatives to follow up on deliveries
  • Assistance on delivery logistic

Installation / First Fills / Top-ups

  • Onsite account managers to assist with initial supply
  • Regular plant and mill visits to constantly assess needs and products supplied

Performance Follow-up

Product Performance Follow- up

  • Data sharing with customers
  • Feedback visit reports / open discussions about results and performance

Solution Optimizing

  • Redefining technical segmentation of applications

Equipment availability

  • Improve, correct, react and proactively intervene to keep equipment performance at optimum levels

Heat-Treated High Chrome Balls

Heat-Treated High Chromium Balls

The high-chromium ball plant operates three production lines, all situated at our Germiston site. Balls are produced with different chemistries, with chrome contents ranging from 11% to 32% and sizes ranging from 17mm to 100mm. Different heat-treatment cycles are used to impart specific metallurgical properties depending on the intended application. Whether the predominant wear mechanism is abrasion, corrosion or impact, GMSA can offer a product to suit.

Heat-treated high chromium balls production cycle:

  1. Scrap processing and charging
  2. Induction furnace operation
  3. Ball casting lines
  4. Shaker, breaker, sorting and heat treatment
  5. Mill test
  6. Dispatch

Heat-Treated Forged Steel Balls

All GMSA forged media are manufactured to international quality standards and the processes include a quench & temper stage for improved hardness & toughness, providing for excellent impact and wear performance.

The forged ball plant operates three production lines.

Smaller, roll formed balls from 38mm-76mm are manufactured on our state-of-the-art roll-forming machine.

Larger balls from 90mm to 125mm are produced by an upset-forge process.

All processes include quenching and tempering cycles for improved toughness and hardness.

Heat-Treated Forged Steel Balls
Heat-Treated High Chrome Balls

Further Optimisation

As part of the Magotteaux International partnership, GMSA has access to optimisation tools developed and marketed by Magotteaux International and proprietary of Magotteaux International.

These toolsā€™ main goal is to further optimise the efficiency of mills as well as the downstream processing recovery.

Among these tools, we find:

Please contact our sales representatives for more information.

Magotteaux International is also a leader in wear resistant castings and mine liners. These often make part of our mill optimisation packages.

Heat-Treated High Chrome Balls