Gray cast iron and preparation method thereof
A gray cast iron and cast iron technology, applied in the field of gray cast iron preparation, can solve the problems of casting shrinkage cavity, shrinkage porosity, increased deformation, poor casting performance of cast iron, high cost pressure of castings, etc., to achieve shrinkage porosity and deformation, small, High yield and good casting performance
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preparation example Construction
[0021] The preparation method of the gray cast iron comprises the following steps:
[0022] The first is the smelting process. The metal charge is mainly scrap steel, mainly including 25% to 40% of ordinary steel scrap; 10% to 15% of chromium-containing scrap; 28% to 45% of returned furnace iron; 5% to 25% of pig iron; 0.5% to 1% ferrosilicon; 0.5% to 1.5% ferromanganese and 8% to 11% layer coke (layer coke is casting coke with a carbon content ≥ 88%) to smelt metal charge into molten iron. And detect and adjust the composition of molten iron, so that the carbon content in the molten iron is 3.0% to 3.2%, the silicon content is 1.35% to 1.55%, the manganese content is 0.85% to 1.10%, the chromium content is 0.08% to 0.15%, and the phosphorus content is ≤ 0.065%, sulfur content ≤ 0.11%, after adjusting to meet the standard, let stand and remove slag.
[0023] Then inoculation treatment: in the process of tapping molten iron after smelting, quantitatively add an inoculant befor...
Embodiment example 1
[0030] The main components of gray cast iron include: 3.031% carbon; 1.783% silicon; 1.080% manganese; 0.112% chromium; 0.034% antimony; 0.098% sulfur and 0.060% phosphorus.
[0031] The preparation method of the gray cast iron comprises the following steps:
[0032] The first is the smelting process. The metal charge includes 35% ordinary steel scrap; 15% chromium-containing scrap; 40% returned iron; 10% pig iron; 0.6% ferrosilicon; 0.5% ferromanganese and 11% layer coke. Firstly, the metal charge is smelted in the cupola. The temperature of the process is required to be controlled above 1450°C, and then the molten iron is returned to the heat preservation electric furnace to raise the temperature. After analyzing the composition of the molten iron through the spectrum, the composition is determined according to the composition percentage of gray cast iron. Adjust, then stand still, remove slag, tap iron, and the iron tapping temperature is controlled at 1435-1460°C.
[0033...
Embodiment example 2
[0037] The preparation method of the gray cast iron of this embodiment is similar to that of Embodiment 1. The main difference is that the metal charge includes: 35% ordinary steel scrap; 15% chromium-containing scrap; 40% returned iron; 10% pig iron; 0.9% ferrosilicon; 1.3% ferromanganese and 10% layer coke.
[0038] The amount of inoculant in front of the furnace is 0.4% of the total mass of molten iron; the amount of inoculant with flow is 0.1% of the total mass of molten iron.
[0039] The main chemical components in the final shaped casting include: 3.065% carbon; 1.757% silicon; 1.120% manganese; 0.105% chromium; 0.028% antimony; 0.096% sulfur and 0.056% phosphorus.
[0040] The tensile strength of the casting is 332MPa; the casting body hardness HB is 198; the graphite form is type A; the graphite size is 4-5 grades, pearlite ≥ 98%; cementite ≤ 1%.
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