High-strength cylinder sleeve, preparing method of cylinder sleeve and iron alloy

[0040] The invention provides a method for preparing a high-strength cylinder liner, which includes the following steps:

[0041] a) The raw materials are smelted to obtain molten iron;

[0042] b) The inoculation of the molten iron to obtain the inoculated molten iron; the content of C in the inoculated molten iron is 2.8-3.4 wt%, the content of S is 0-0.1 wt%, and the content of Si is 1.5-2.5 wt%, the content of P is 0.1-0.4wt%, the content of Mn is 0.5-0.8wt%, the content of Cr is 0.1-0.4wt%, the content of Mo is 0.2-0.5wt%, the total content of Cu and Ni is 0.2~0.5wt%, Fe content is the balance;

[0043] c) Centrifugal casting of the inoculated molten iron to obtain a high-strength cylinder liner.

[0044] In the preparation method provided by the present invention, the raw materials are first smelted. Wherein, the temperature of the smelting is preferably 1480-1550°C, more preferably 1508-1510°C. After smelting is finished, molten iron is obtained.

[0045] After the iron liquid i

[0049] Example 1

[0050] (1) To smelt the raw materials, adjust the chemical composition of the molten iron, specifically: weigh the specified raw materials in proportion, smelt them in an intermediate frequency induction furnace at 1510°C, and adjust the seasoning according to the following weight requirements: carbon: 3.10wt%, sulfur: 0.05wt%, Silicon: 1.5wt%, phosphorus: 0.13wt%, manganese: 0.55wt%, chromium: 0.12wt%, copper: 0.05wt%, nickel: 0.40wt%, molybdenum: 0.45wt%, iron: the balance to obtain molten iron ;

[0051] (2) Liquid iron pretreatment, specifically: adding a silicon-zirconium inoculant (ElkemPreseed, particle size 3-10mm) with a mass of 0.06% of the molten iron and a calcium silicate inoculant (Elkem Preseed, with a particle size of 0.06%) to the molten iron. 3~10mm), keep warm, and get one inoculation iron liquid;

[0052] (3) Iron inoculation, specifically: one inoculation of molten iron for downstream inoculation, using silicon strontium zirconium inoculant (Elk

[0056] Example 2

[0057] (1) To smelt the raw materials, adjust the chemical composition of the molten iron, specifically: weigh the specified raw materials in proportion, smelt them in an intermediate frequency induction furnace at 1508°C, and perform the seasoning according to the following weight requirements: carbon: 3.04wt%, sulfur: 0.052wt%, Silicon: 1.6wt%, phosphorus: 0.12wt%, manganese: 0.53wt%, chromium: 0.13wt%, copper: 0.08wt%, nickel: 0.36wt%, molybdenum: 0.46wt%, iron: the balance to obtain molten iron ;

[0058] (2) Liquid iron pretreatment, specifically: adding a silicon-zirconium inoculant (ElkemPreseed, particle size 3-10mm) of 0.05% of the liquid iron mass and a calcium-silica inoculant (Elkem Preseed, particle size of 0.05%) to the liquid iron 3~10mm), keep warm, and get one inoculation iron liquid;

[0059] (3) Iron inoculation, specifically: one inoculation of molten iron for downstream inoculation, using silicon-strontium-zirconium inoculant (ElkemSuperseed Ext