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The effect of hot rolling on hardness properties and microstructure of laterite steel

机译：热轧轧制对红土钢的硬度性能和微观结构的影响

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Nickel containing pig iron (NCPI) is one of important materials for stainless steel and other iron-nickel alloys production. The natural source of NCPI in Indonesia is laterite ore. Large deposit of laterite ore has been found in South East Sulawesi. High grade laterite ore (saprolitic type of laterite ore) in this region has been used for ferronickel making, whereas low grade laterite ore (limonitic type of laterite ore) has not been processed, due to its too low nickel conten. However, laterite steel has not been widely reviewed as potential candidate for top national product comprehensively. Therefore, this study is aimed to know several aspects of its intrinsic properties by using hot roll process. A variety of thickness reduction on steel is used by rolling to know its mechanical properties especially hardness, followed by microstructure observation, and then compared with its as-cast. The result has shown that the highest hardness (282HRB) obtained in 31-35% reduction which is increased by 47,7% of as cast steel. Optical microscope images showed that ferrite phase and grain refinement which is caused an increasingon hardness. This study is expected as a reference for further research. The chemical composition of steel Laterite as more likely as HSLA steels with certain specialized alloys to obtain specific mechanical properties. Meanwhile the hardness of Laterite steel is possible for some products similar to AISI416 standard.
机译：含镍铁（NCPI）的镍是不锈钢和其他铁镍合金生产的重要材料之一。印度尼西亚的NCPI的自然来源是横向矿石。在东南苏拉威威西赛中发现了Lactite Oree的大押金。该区域中的高级后岩矿石（Saprolitical的后卫矿石）已被用于铁龙尼克尔制造，而尚未加工低级外卫矿石（紫黑质的红土矿石），由于其太低的镍对此而导致。然而，Widdite钢铁尚未得到全面审议顶级国家产品的潜在候选者。因此，本研究旨在通过使用热轧工艺来了解其内在特性的几个方面。通过轧制使用钢的各种厚度减小，以了解其机械性能尤其是硬度，然后是微观结构观察，然后与其铸造相比。结果表明，在铸钢中增加了31-35％的最高硬度（282HRB），其为铸钢的47.7％。光学显微镜图像显示，铁氧体相和晶粒细化，这导致了增加的硬度。预计这项研究是进一步研究的参考。钢的化学成分与某些专用合金的HSLA钢一样可能是获得特定的机械性能。同时，与AISI416标准类似的产品，卫星的硬度也是可能的。

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