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Spring steels are the materials most commonly used in suspensions of vehicles and are subject to heavy efforts in terms of load, impact and also under intense fatigue solicitation. Required mechanical performance depends mainly on the chemical composition and heat treatments. Therefore, the aim of the present work was to compare SAE 5160 steel with one Super Clean steel developed in Slovenia. Searches improving mechanical properties of these steels are constantly present in the automotive industry, reducing vehicle weight and maintaining safety. In this scenario, cryogenic treatment in combination with quenching and tempering has shown interesting results in the scientific literature for tool steels and the best results for cryogenics are achieved when the treatment occurs for long duration as 24 hours.

The present work has the objective to quantify and evaluate abrasive wear resistance of a hard coating. It is obtained by weld deposition of an iron based alloy containing Cr and Nb as carbide forming elements, and to compare it to wear resistance of a heat treated SAE 5160 steel, normally used for agricultural equipment. Wear resistance was determined from two body and a three body abrasion tests using pin abrasion test equipment and a rubber wheel abrasion test, respectively.

Wear resistance of high Cr white cast irons can be improved by means of heat treatment. The purpose of this work was to study the influence of parameters such as quenching and tempering temperatures and sub zero treatment in the abrasion wear performance of the high Cr white cast iron Nb alloyed. Pin-on-disc abrasion tests were performed and the worn surface was examined by SEM. The main wear mechanisms were identified. This Fe alloy has shown good performance for applications in mining and alcohol-sugar industries.