A kind of as-cast high strength and toughness synthetic nodular cast iron qt800-5 and its preparation method
A nodular cast iron, high-strength technology, applied in the field of high-performance metal material manufacturing, can solve the problem that the strength is difficult to meet the material requirements of higher fatigue strength and comprehensive performance, and achieve good spheroidization effect, reduce supercooling degree, and increase graphite The effect of the number of balls
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Embodiment 1
[0036] Example 1, see figure 1 :
[0037] The invention provides an as-cast high-strength and toughness synthetic ductile iron QT800-5, which comprises the following components and their mass percentages: C: 3.76%, Si: 3.35%, Mn: 0.197%, P: 0.022%, S: 0.016%, Ni: 0.714%, Cu: 0.633%, Mg 残 : 0.059%, Fe: 91.164%, other trace elements: balance.
[0038] A preparation method of as-cast high-strength and tough synthetic nodular cast iron QT800-5 (melting in a 100Kg medium-frequency induction furnace), comprising the following steps (percentages are mass fractions):
[0039] (1) Ingredients and smelting: Add 3.6% recarburizer, 27.1% scrap steel (45# steel), 59.3% pure iron with low sulfur and low manganese, and 10% ductile iron return charge to the intermediate frequency induction furnace, and heat up to 1550 ℃ for smelting to obtain the original molten iron;
[0040] (2) Alloying: Add 75% ferrosilicon and 0.6% cathode copper of its quality 3% to the original molten iron, and con...
Embodiment 2
[0048] Example 2, see figure 2 :
[0049] The invention provides an as-cast high-strength and toughness synthetic nodular cast iron QT800-5, which comprises the following components and their mass percentages: C: 3.942%, Si: 3.423%, Mn: 0.173%, P: 0.030%, S: 0.016%, Ni: 0.738%, Cu: 0.623%, Mg 残 : 0.065%, Fe: 90.834%, other trace elements: balance.
[0050] A preparation method of as-cast high-strength and tough synthetic nodular cast iron QT800-5 (melting in a 100Kg medium-frequency induction furnace), comprising the following steps (percentages are mass fractions):
[0051] (1) Ingredients and smelting: Add 3.2% recarburizer, 27.9% steel scrap (45# steel), 56.9% pure iron with low sulfur and low manganese, and 10% ductile iron return charge to the intermediate frequency induction furnace, and heat up to 1550 ℃ for smelting to obtain the original molten iron;
[0052] (2) Alloying: Add 75 ferrosilicon and 0.62% cathode copper of its quality 3.4% to the original molten iro...
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