| 摘要 |
Alloyed steel with high carbon content characterised in that its composition complies with the following composition, expressed in percentage weight: carbon from 1.1 to 2.0 %, manganese from 0.5 to 3.5 %, chrome from 1.0 to 4.0 %, silicon from 0.6 to 1.2 %, the remainder being iron with the usual impurity content, such that it provides a metallographic structure mainly of non-equilibrium fine pearlite and that its hardness is between 47 Rc and 54 Rc. In such method the structure of pearlite is obtained by taking out the hot piece from the foundry mould and its chemical composition is modified by cooling. The grinding preparation obtained by such process is in the form of mould balls with the diameter 100 mm of the alloy containing 1.5 wt. % of carbon up to 3.0 wt. % of manganese, 3.0 wt. % of chrome and 0.8 wt. % of silicon or in the form of mould ground balls with diameter 70 mm of the alloy containing 1.5 wt. % of carbon, 0.8 to 1.5 wt. % of manganese, 3.0 wt. % of chrome and 0.8 wt. % of silicon.
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