Quality, no compromise

Liners and Wear Plates

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Liners and wear Plates

The experience acquired in the field of precision mechanics has been put to good use in the construction of wear plates for rolling mills and of components used in the metallurgical industry.

We work with the world’s leading steel mills and steel plant manufacturers, constantly supporting them in the development of new projects as well as in the regeneration and modernization of existing rolling systems. Our liners are designed to ensure the highest performance of rolling mill rolls.

We thoroughly guide the customer in the design of the plates, the associated construction drawings, the selection of the most suitable material, and the implementation of heat treatment to ensure maximum durability.

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At Lorenzon we design and manufacture all types of plates for rolling mills. Each plate has a different use and is therefore mounted in a different part of the plant: on the lower part of the rolling cage (rocker plates), on the work roll chock liners and back up chock liners, on the cage (housing liners).

Liners, or wear plates, are indeed a fundamental part of the rolling plant. They must withstand the enormous pressures exerted by the roller, as well as possess excellent resistance to wear, corrosion, and friction. Similarly, liners must be able to absorb the enormous vibrations generated during plant operation.

The proper functioning of these plates is, in fact, a critical aspect of the entire rolling process; wear, corrosion, and erosion can alter the dimensions of the plate, causing errors and inaccuracies in the lamination process, and permanently altering the thickness and final quality of the laminated product.

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The most requested Materials

MATERIAL (DIN)	SURFACE HARDNESS	HARDENING DEPTH	SOFT SIDE HARDNESS
C45	60 +/- 2 HRc	3 to 5 mm	~ 180 HB
42CrMo4 / 1.2311 / 1.2312	60 +/- 2 HRc	3 to 5 mm	~ 300 HB
1.2083	56 +/- 2 HRc	3 to 5 mm	~ 210 HB

Liners can also be made using other materials and special treatments according to the customer’s specific requirements. We are available any time to assess the best solution directly with the customer and formulate the appropriate production cycle for your requirements.

A fundamental phase in the production process is the post-hardening straightening. Prior to the final grinding, our liners are straightened by hand and through the use of specific hydraulic presses in order to correct deformations induced by induction hardening. This is a critical operation to ensure that the required geometric and dimensional tolerances are met.

Welding and Cobot

We recently acquired seven-axis Cobot systems for TIG welding of the microcracks and burns that occur during straightening and induction hardening processes. These automated systems allow these operations to be performed independently of the operator’s manual skills, ensuring uniform and consistent results.

Each liner undergoes rigorous inspection, including through the use of laser machines, by highly qualified personnel before being shipped to the customer. In some cases, where there is a need and a customer request, we also perform non-destructive tests such as penetrating liquids and ultrasounds.