Cylinder sleeve alloy cast iron medium-frequency induction furnace melting method and centrifugal casting method
An induction furnace and alloy cast iron technology, applied in the direction of improving process efficiency, can solve the problems of reducing raw material cost, large tendency of molten iron to be supercooled, poor inoculation effect, etc., and achieve the effect of reducing production cost and improving strength and hardness
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Embodiment 1
[0015] Embodiment 1: An intermediate frequency induction furnace smelts cylinder liner alloy cast iron according to the following steps:
[0016] (1) Metal furnace charge and ferroalloy: the lump size of the returned charge is not more than 300x200x200mm; the scrap steel has no serious corrosion phenomenon, the block size is ≤500x200mm, the long charge is less than 1 / 2 of the furnace, <550mm; the length of high silicon pig iron is not greater than 400mm; the returned charge It is scrap cylinder liner; scrap steel is 20# steel pipe head; high-silicon pig iron contains 3.8% carbon and 3%-5% silicon; ferroalloy material: Si75 for ferrosilicon, block size 200x100mm; FeB18C0.5A for ferroboron, block The thickness is 50-100mm; the iron filings are required to be free of serious corrosion, and the water content is less than 3%; the recarburizer is graphite type; the iron filings are machined iron filings for the cylinder liner;
[0017] (2) Mass percentage of charge: iron filings 59%...
Embodiment 2
[0024] Example 2: The intermediate frequency induction furnace is used to smelt cylinder liner alloy cast iron according to the following steps: (1) Metal furnace charge and ferroalloy: the lump size of the returned furnace material is not more than 300x200x200mm; the scrap steel has no serious corrosion phenomenon, the lump size is ≤500x200mm, and the long material is less than 1 / 2 of the furnace chamber , <550mm; the length of high-silicon pig iron is not more than 400mm; the recycle material is waste cylinder liner; scrap steel is 20# steel pipe head; high-silicon pig iron contains 3.8% carbon by mass and 3%-5% silicon; ferroalloy material: silicon Si75 for iron, lumpiness 200x100mm; FeB18C0.5A for ferroboron, lumpiness 50-100mm; iron filings are required to be free from serious corrosion and moisture <3%; graphite type is used for recarburizer; the iron filings are cylinder liner machined iron crumbs;
[0025] (2) Mass percentage of charge: iron filings 59%+scrap steel 28%...
Embodiment 3
[0032] Embodiment 3: The intermediate frequency induction furnace smelts the cylinder liner alloy cast iron according to the following steps:
[0033](1) Metal furnace charge and ferroalloy: the lump size of the returned charge is not more than 300x200x200mm; the scrap steel has no serious corrosion phenomenon, the block size is ≤500x200mm, the long charge is less than 1 / 2 of the furnace, <550mm; the length of high silicon pig iron is not greater than 400mm; the returned charge It is scrap cylinder liner; scrap steel is 20# steel pipe head; high-silicon pig iron contains 3.8% carbon and 3%-5% silicon; ferroalloy material: Si75 for ferrosilicon, block size 200x100mm; FeB18C0.5A for ferroboron, block The thickness is 50-100mm; the iron filings are required to be free from serious corrosion, and the water content is less than 3%; the recarburizer is graphite type; the iron filings are machined iron filings for the cylinder liner;
[0034] (2) Mass percentage of charge: iron filin...
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Abstract
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