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Technical Paper

The role of niobium for the development of wear resistant steels with superior toughness

International Symposium on Wear Resistant Alloys for the Mining and Processing Industry

Wear resistant steels are commonly designed to have a high hardness and at the same time good weldability due to a low alloy content. The high hardness is achieved by quenching the material to a martensitic microstructure, which requires systematic alloying with Mn, Cr, Ni and Mo. However, even for wear resistant steels, a high toughness may be advantageous, as it not only ensures good impact resistance, even at sub-zero temperatures, but can enhance the wear resistance by causing a change in the wear mechanism. Besides a high level of process-based steel cleanliness, microalloying with Nb provides the basis to enhance the toughness of the steel. The objective of this paper is to present a selected study of how microalloying with Nb in combination with a well-adapted process route can be used to obtain wear resistant steels with a superior balance of toughness and hardness. (AU) Copyright © 2018 Companhia Brasileira de Metalurgia e Mineração (CBMM) All rights reserved
Technical Paper (PDF 1,57 MB)