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

Tarumanagara International Conference on the Applications of Technology and Engineering

工业技术（总论）

Siahaan, E.^1 ; Riza, A.^1

Faculty of Engineering Universitas Tarumanagara, Jakarta

11440, Indonesia^1

关键词: Chemical compositions;    Intrinsic property;    Iron-nickel alloys;    Microstructure observation;    National products;    Nickel containing;    Properties and microstructures;    Thickness reduction;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/508/1/012056/pdf
DOI  :  10.1088/1757-899X/508/1/012056

学科分类：工业工程学

来源: IOP

【 摘 要 】

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.