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2800XP电炉是我公司与美国P＆H公司合作为平朔百天煤矿生产的大型采煤挖掘设备，工作条件恶劣。作为主要零部件之一的回转台上、下部辊道承载约600-700t，要求选用P＆H112（即美国的4340H）钢，基体硬度要求HB285-321；上、下部辊道直径大，外径φ4622．8mm、内径φ4235．5mm、
2800XP EAF is a large-scale coal mining equipment produced by our company and P & H Company in the United States for the 100 days coal mine in Pingshuo. The working conditions are harsh. As one of the main components, the upper and lower roller tables carry about 600-700t. P & H112 (4340H in the United States) is required. The substrate hardness is required to be HB285-321. The upper and lower roller tables have large diameter and outer diameter of φ4622. 8mm, diameter φ4235.5mm,