Mill Liners By Qiming Machinery®

Qiming Machinery is a leader in the design, manufacture, and supply of mill liners for mineral processing and quarrying industries. We offer our customers complete wear liner solutions for mills that increase performance, equipment availability, and lower maintenance costs. Our mill liners are also tested to withstand the acidity level of different elements that may be present in the milling process. Longer milling life to your machine means fewer expenses and more profit or income to your company.

Qiming Machinery mill liners are subjected to different combinations of impact and abrasion, as they are used in SAG/AG, ball or rod mills. Our wear parts are manufactured to the highest standards of quality and delivery, ensuring high levels of reliability for our customers. Also, our mill liners wear parts that add value to customers’ processes through customized designs.


  • Supplies various materials to choose from, which include manganese steel, chromium steel, Ni-hard steel, and alloy steel.
  • Supplies all types of mill liners. No matter shell liners, feed headliners, pulp lifters, end liners, or bottom liner, Qiming Machinery is your first choice.
  • A strict quality control system. Qiming Machinery had passed ISO9001:2008 quality control system.
  • All reports can be supplied. We will supply all reports to you which include the material report, size report, hardness report, and mechanical behavior reports.

When choosing any type of mill liners for your mill plants, think long-term. Qiming Machinery’s parts help keep your mill plants working at peak performance because they are made to fit and function for just that.

Which mill liners we can manufacture?

SAG Mill Liners

SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. SAG mill is usually used to grind large pieces into small pieces, especially for the pre-processing of grinding circuits, thus also known as primary stage grinding machine.

Qiming Machinery manufactures SAG mill liners based on customers’ working conditions which can prolong the mill liners’ span life.

Common wear parts

  • Integrated and/or plate and lifter designs for head and shell liners
  • Grates
  • Pulp lifters
  • Filler rings


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SAG Mill Liners By Qiming Machinery

AG Mill Liners

AG is short for the autogenous mill. it combines with two functions of crushing and grinding, uses the ground material itself as the grinding media, through the mutual impact and grinding action to gradually reduce the material size.

Qiming Machinery’s mill liners are suitable for all AG mill applications and available in a wide range of designs, dimensions, and profiles.

Common AG mill liners include:

  • Integrated and/or plate and lifter designs for head and shell liners
  • Grates
  • Pulp lifters
  • Filler rings


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AG Mill Liners By Qiming Machinery

Ball Mill Liners

Ball mill is a fine grinder. A horizontal or vertical rotating cylinder is filled partially with the balls of ceramics, small rocks, and balls made from stainless steel. The ball charge of a SAG mill is about 29% to 30%. By friction and influence of tumbling balls inside the rotating cylinder grinds the raw material to the required fineness. The internal machinery of the ball mill grinds the raw material into the powder-like material, And if extreme fineness and refinery are required then rotation goes on to continue.

The role of a ball mill liner is to give the mill heads protection against wear and tear thus increasing their lifetime and creating optimal grinding efficiency. Qiming Machinery can design and supply mill liners for all types of ball mill.

Common ball mill parts include:

  • Single wave liners
  • Modified single wave liners
  • Double wave liners
  • Shell liners
  • Feed headliners
  • Discharge end liners


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Ball Mill Liners By Qiming Machinery

Rod Mill Liners

Rod mills are very similar to ball mills, except they use long rods for grinding media. The rods grind the ore by tumbling within the mill, similar to the grinding balls in a ball mill. To prevent the conditions leading to rod charge tangling, the length to diameter ratio is maintained at 1.4 to 1.6. Rod mills accept feed up to about 50 mm (2 in.) and produce a product in the size range of 3000 to 270 mm (–4 to –35 mesh). Grinding action is by line contact between the rods extending the length of the mill. Rods tumble and spin in roughly parallel alignment simulating a series of roll crushers. This results in preferential grinding of coarse material and minimizes the production of slimes.

Qiming Machinery manufacture wears liners for all types of rod mills.

The common rod mill parts include:

  • Shell liners
  • Headliners
  • “Wedge” shell liners


Rod mill liners by Qiming Machinery

Manganese Steel Mill Liners

This is used for grid liners and generally smaller mills. Its great advantage is that it works hardens under stress, yet the substrate remains tough and can withstand extreme impact without fracture. Its primary disadvantage is that it spreads with impact, so solid liners begin to squeeze together and become extremely difficult to remove, and can damage a mill shell if the stress is allowed to build up to an extreme level.


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Manganese steel mill liners by Qiming Machinery

Chrome Moly Steel Mill Liners

Based on different working conditions, Qiming Machinery manufactures the different moly steel mill liners.

Low Carbon Chrome Moly Steel (300 to 370BHN): Was generally used for mill liners (AG, SAG, and Ball) prior to the movement to higher carbon content steels. It has excellent wear characteristics with some impact resistance, generally now used for discharge grates where slightly better impact resistance is required compared to the higher carbon chrome-moly steels or for thinner section liners.

High Carbon Chrome Moly Steel (325 to 380BHN): This steel is now considered the main material used for SAG mill liners. There are a number of variations with either different carbon or chrome contents. The variations tend to have a bearing on the size of the liner and its section thickness. There is ongoing development within this area as the size of the liners is outstripping the properties provided by the standard high chrome-moly steels.

Chrome Moly White Irons (600 to 700BHN) WI: This casting material is considered to be the ultimate developed and used to date for abrasion resistance in Milling. It is commonly used in cement mills and some of the largest Ball Mills in the world and where performance has not been bettered to date.


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Chrome Moly Steel Mill Liners By Qiming Machinery

Nihard Iron Mill Liners

The use of this type of material generally began with Rod Mills and Ball Mills, where impacts were considered low enough for this brittle yet highly abrasive resistant wear material to perform well. However, it is now considered obsolete in light of the use of high chrome irons and chrome-moly white iron.


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Nihard Iron Mill Liners

Chromium Alloy Steel Mill liners

High chromium alloy cast iron generally refers to the alloy white cast iron with the chromium content of 12% – 30% and carbon content of 2.4% – 3.6%. It is characterized by the microhardness hv1300 ~ 1800 of M7C3 eutectic carbide, which is dispersed on the matrix of martensite (the hardest structure in the metal matrix) in the form of a broken network and isolated shape, which reduces the splitting effect on the matrix.

Qiming Machinery manufactures chromium alloy steel mill liners for customers.


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Chromium Alloy Steel Mill liners