Corrosion-resistant alloy cast iron material for diesel engine cylinder and preparing method thereof

A corrosion-resistant alloy, diesel engine technology, applied in the field of cast iron materials, can solve the problems of inability to meet market demand, poor corrosion resistance, etc., and achieve the effect of improving heat resistance, excellent corrosion resistance, and good toughness

Inactive Publication Date: 2016-04-13
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Problems solved by technology

At present, the gray cast iron diesel engine cylinder material produced in my country ...
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The invention discloses a corrosion-resistant alloy cast iron material for a diesel engine cylinder and a preparing method thereof. The gray cast iron material for the diesel engine cylinder comprises the following components in a percent by mass: 2.8-3.2% of C, 2.2-2.6% of Si, 4.4-4.8% of Ni, 1.9-2.3% of Cr, 3.5-4.0% of Cu, 0.2-0.4% of Mn, 0.3-0.6% of In, 0.2-0.4% of Ge, 0.05-0.1% of La, 0.04-0.08% of Pm, 0.03-0.06% of Gd, 0.04-0.07% of P, 0.02-0.04% of S and the balance of Fe. The gray cast iron material prepared by the preparing method has the characteristics of being outstanding in corrosion resistance, high in strength, great in tenacity, great in thermal resistance and the like.

Technology Topic

Cast ironDiesel engine +2


  • Experimental program(1)

Example Embodiment

[0014] Example
[0015] A corrosion-resistant alloy cast iron material for diesel engine cylinders, whose mass percentage components are: C2.8-3.2, Si2.2-2.6, Ni4.4-4.8, Cr1.9-2.3, Cu3.5-4.0, Mn0 .2-0.4, In0.3-0.6, Ge0.2-0.4, La0.05-0.1, Pm0.04-0.08, Gd0.03-0.06, P0.04-0.07, S0.02-0.04, the margin is Fe.
[0016] A preparation method of corrosion-resistant alloy cast iron material for diesel engine cylinder block includes the following steps:
[0017] (1) Use an intermediate frequency induction electric furnace for smelting. First, add scrap steel, pig iron, reflow charge and ferrosilicon at the bottom of the furnace. After the charge is melted, add ferronickel, ferrochrome and ferromanganese. When the temperature of the molten iron reaches 1510℃, add graphite electrode powder. Add carbon, and then add other iron alloys to adjust the chemical composition of the molten iron. The alloying element Cu is added in the form of electrolytic copper 4 minutes before the furnace. When the temperature of the molten iron reaches 1485 ℃, it is kept for 15 minutes, and then the furnace is discharged;
[0018] (2) Choose a silicon-barium inoculant with a particle size of 5mm and add it to the surface of the molten iron in the ladle, and stir appropriately at 1480°C for inoculation treatment in the ladle;
[0019] (3) Add a rare earth chromium manganese silicon inoculant with a particle size of 3 mm into the ladle for secondary inoculation treatment at 1465°C;
[0020] (4) Pour the inoculated molten iron into the clay sand mold at a temperature not lower than 1385°C; then heat the molded castings: first heat to 480°C, hold for 3h, air cool to 220°C, hold for 0.5h; then Heat to 520℃, keep for 2.5h, then heat to 800℃, keep 4h, oil-cool to 420℃, keep 3h; finally heat to 920℃, keep 5h, mist cool to 560℃, keep 3h, then air-cool to 240 ℃, keep for 0.5h, then air-cool to room temperature
[0021] After inspection, the chemical composition of the finished product is: C3.05%, Si2.44%, Ni4.57%, Cr2.12%, Cu3.92%, Mn0.34%, In0.51%, Ge0.32%, La0. 086%, Pm0.069%, Gd0.045%, P0.068%, S0.031%, the balance is Fe. Its mechanical properties are: tensile strength 364Mpa, hardness 213HB.


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