Our constant commitment to innovation, our long tradition in the production of high quality steels, and the support of leading international experts, form the bedrock of MTG Steels.
Specifically designed to withstand the highest levels of mechanical stress when operated, these steels maximize the hardness/toughness combination due to their low level of impurities and structure which is developed using specific heat treatments.
They are medium carbon and low-alloy steels, made with the most advanced production techniques available for steel castings and the steel industry. We guarantee low levels of non-metallic inclusions and dissolved gases thanks to exhaustive composition checks and comprehensive refining processes in electric arc furnaces and AOD converters. This significantly improves their quality, providing greater duration and fewer breakages.
AOD image converter, Monzón (Huesca).
The most important characteristic of MTG Steels is their optimized capacity to withstand wear and impacts. Thanks to these steels, our wear parts last longer and reduce the risk of breakages.
During use, the steel of the teeth is subjected to high static loads and heavy impact at a macroscopic level that can result in breakages, and repetitive mechanical stress that can cause fatigue fracture.
At a microscopic level, and as a result of their interaction with the ground, the outer surface of the parts are subjected to high pressures and temperatures as well as repetitive deformations and impacts that cause their gradual wear.
This wear is a complex phenomenon affected by many variables that are difficult to measure. These variables depend on the type of ground (hardness, compaction, granulometry, angularity, etc,…), the type of application or work (geometric shape of the part and the pressure it is subjected to, angle of attack, speed, etc...) and even climatic conditions (corrosion phenomena).
Among the different types of wear that are seen, our parts are mainly subjected to abrasive kinds of wear. When interacting with the ground, the steel of the outer surface of the teeth and adapters is severely deformed until it finally breaks.
Various abrasion mechanisms during interaction of MTG steels with the ground.
HOW DO MTG STEELS OBTAIN MAXIMUM WEAR RESISTANCE?
Through the optimal balance between its principal properties.
Traditionally, the hardness of the steel has been associated with its performance when used in wear parts. The greater the hardness of the steel, the greater the wear resistance and duration of the parts.
This traditional view is accurate in relation to conditions of use in which pressure between the parts and the ground is low or moderate However, numerous site tests and laboratory trials carried out at leading universities and institutions have shown that, in certain conditions of service, other features of the steel are as important as hardness to ensure maximum wear resistance.
In demanding applications in which conditions of use involve high levels of pressure between the parts and the ground, high toughness levels are required in addition to high levels of hardness to ensure maximum wear resistance.
The hardness of a steel is measured according to its capacity to resist permanent deformation. It is also defined as penetration and scratch resistance.
The maximum level of hardness a steel is capable of attaining is almost entirely determined by its carbon content. Effective heat treatment and sufficiently severe tempering enables the maximum hardness to be developed both on the surface and on the inside of the parts.
MTG Steels guarantee a high level of hardness resulting from a carefully studied composition and a specific treatment especially developed by MTG.
The toughness of a steel is measured according to its capacity to resist breakage when subjected to impact. In the broadest sense, this also indicates the steel's capacity to endure plastic deformation without breaking.
The homogeneity of the structure of the steel, as well as the level of inclusions and their morphology, are factors that determine its toughness.
MTG Steels are rugged steels that guarantee that parts will not break and will wear less even in the most demanding situations.
Degree of refinement
All non-metallic inclusions and dissolved gases that are not removed during production have a negative effect on the steel's toughness.
Thanks to the high quality standards applied in the production of MTG Steels, including extensive refining stages in electric arc furnaces as well as AOD converters, we are able to guarantee high levels of impurities in our products as well as their high level of toughness.
1. Fragile steel due to continued inclusions at the grain limit.
2. Quality steel. The inclusions are globular with some sharp edges. This steel does not break (it is tough) although the inclusions affect the characteristics of the steel.
3. High-quality MTG Steel: clean steel. The number and size of inclusions, which are small and round, have been reduced.