Abstract:
The market for air cooled steels has matured in the last 10 years. The advantages of these steels, in terms of elimination of heat treatment, reduced distortion, improved machinability and more consistent properties have led to their use in a wide range of automotive components. In Europe, most forgers, working in partnership with steel producers, now have the necessary equipment and expertise to enable cooling after forging to be controlled accurately and reliably. The use of controlled rolling and cooling has also enabled the required mechanical properties to be achieved in bar stock without the need for heat treatment. The paper reviews the grades of microalloyed and carbon manganese steels in current use and the properties of these steels. It considers how these properties can be influenced by the steelmaker through composition adjustment and controlled rolling, and by the forger by control of the forging and cooling conditions. A number of case studies are used to demonstrate these points. Possible future developments of both microalloyed and carbon steels are also reviewed. These include the use of accelerated cooling and the use of higher carbon and nitrogen steels.
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The market for air cooled steels has matured in the last 10 years. The advantages of these steels, in terms of elimination of heat treatment, reduced distortion, improved machinability and more consistent properties have led to their use in a wide range of automotive components. In Europe, most forgers, working in partnership with steel producers, now have the necessary equipment and expertise to enable cooling after forging to be controlled accurately and reliably. The use of controlled rolling and cooling has also enabled the required mechanical properties to be achieved in bar stock without the need for heat treatment. The paper reviews the grades of microalloyed and carbon manganese steels in current use and the properties of these steels. It considers how these properties can be influenced by the steelmaker through composition adjustment and controlled rolling, and by the forger by control of the forging and cooling conditions. A number of case studies are used to demonstrate these points. Possible future developments of both microalloyed and carbon steels are also reviewed. These include the use of accelerated cooling and the use of higher carbon and nitrogen steels.
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