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Smelting method of high strength vermicular iron

A high-strength, vermicular iron technology, applied in the field of iron smelting, can solve the problem of no smelting method, and achieve the effects of easy pouring temperature, small temperature drop, and stable creep rate

Active Publication Date: 2017-03-15
JIANGSU JINSHI CASTING & FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there has been no smelting method with stable quality in domestic vermicular iron production

Method used

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  • Smelting method of high strength vermicular iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: produce vermicular iron according to the following specific steps

[0026] (1) Ingredients: Add the weighed charge to the 1T intermediate frequency furnace. The charge is composed of returned charge, scrap steel and pig iron, and the returned charge accounts for 30% of the total charge;

[0027] (2) Melting: power transmission to melt the charge, fully stir the molten pool after the charge is melted, take samples for analysis and discharge slag, add ferrosilicon, ferromanganese, ferromolybdenum and copper alloy to adjust the chemical composition of molten iron, the chemical composition of molten iron is controlled as: carbon 3.3 %, silicon 2.2%, manganese 0.60%, phosphorus ≤0.07%, sulfur ≤0.05%, chromium 0.95%, copper 0.50%, molybdenum 0.20%, titanium ≤0.19%, magnesium 0.010%, RE 0.010%, and the rest is iron;

[0028] (3) Vermicularization: 0.45% of the amount of molten iron is placed in the vermisification ladle, and 3 / 5 of the molten iron in the ladle is...

Embodiment 2

[0031] Embodiment 2: produce vermicular iron according to the following specific steps

[0032] (1) Ingredients: Add the weighed charge to the 1T intermediate frequency furnace. The charge is composed of returned charge, scrap steel and pig iron, and the returned charge accounts for 30% of the total charge;

[0033] (2) Melting: power transmission to melt the charge, fully stir the molten pool after the charge is melted, take samples for analysis and release slag, add ferrosilicon, ferromanganese, ferromolybdenum and copper alloy to adjust the chemical composition of molten iron, the chemical composition of molten iron is controlled as follows: carbon 3.5 %, silicon 2.4%, manganese 0.70%, phosphorus ≤0.07%, sulfur ≤0.05%, chromium 0.97%, copper 0.60%, molybdenum 0.24%, titanium ≤0.19%, magnesium 0.020%, RE 0.020%, and the rest is iron;

[0034] (3) Vermisification: 0.50% of the amount of vermisifying agent is placed in the vermisification ladle, 3 / 5 of the molten iron in the l...

Embodiment 3

[0037] Embodiment 3: produce vermicular iron according to the following specific steps

[0038] (1) Ingredients: Add the weighed charge to the 1T intermediate frequency furnace. The charge is composed of returned charge, scrap steel and pig iron, and the returned charge accounts for 30% of the total charge;

[0039] (2) Melting: power transmission to melt the charge, fully stir the molten pool after the charge is melted, take samples for analysis and discharge slag, add ferrosilicon, ferromanganese, ferromolybdenum and copper alloy to adjust the chemical composition of molten iron, the chemical composition of molten iron is controlled as: carbon 3.6 %, silicon 2.6%, manganese 0.80%, phosphorus ≤0.07%, sulfur ≤0.05%, chromium 0.98%, copper 0.70%, molybdenum 0.28%, titanium ≤0.19%, magnesium 0.030%, RE 0.030%, and the rest is iron;

[0040] (3) Vermisification: 0.55% of the amount of vermisifying agent is placed in the vermisification ladle, 3 / 5 of the molten iron in the ladle i...

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Abstract

The invention discloses a melting method of high-strength vermicular graphite iron. The melting method comprises the following steps: first, melting down furnace charge; second, carrying out sampling after melting down for analysis, discharging slag, adding ferrosilicon, ferromanganese, ferromolybdenum and a copper alloy to adjust the chemical components of molten iron; then, putting a vermicularizer into a vermicularizing ladle, pouring molten iron in a molten iron ladle into the vermicularizing ladle for vermicularizing; adding an inoculator and a covering agent for inoculation; finally, carrying out pouring to obtain the high-strength vermicular graphite iron, wherein the tensile strength of the vermicular graphite iron is equal to or larger than 400 Mpa, the ductility of the vermicular graphite iron is equal to or larger than 1.0 percent, the body vermicular rate of the vermicular graphite iron is equal to or larger than 75 percent, and the pearlite content of the vermicular graphite iron is equal to or larger than 35 percent. According to the method, the vermicularizer, the inoculator and the covering agent are adopted for production of the vermicular graphite iron, the reaction process is smooth, intense boiling is avoided, the absorption rate of the vermicularizer is high, the addition of the vermicularizer is low, the chemical component segregation degree is low, the temperature drop is low, the pouring temperature is easy to control, and the operability and the safety are improved.

Description

technical field [0001] The invention relates to an iron smelting method, in particular to a high-strength vermicular iron smelting method. Background technique [0002] In the past 20 years, scientific research personnel have carried out fruitful research and development work on the application of vermicular iron in engine cases of automobiles and brakes of trains, and have achieved certain scientific research results. [0003] Compared with gray cast iron, the strength and wear resistance of vermicular iron are greatly improved; compared with cast steel, vermicular iron has obvious advantages in thermal conductivity and wear resistance; and compared with high-strength aluminum alloy, vermicular iron Iron has good shock resistance and economy. [0004] The tensile strength of vermicular iron can reach 350-450Mpa, and the high temperature strength of vermicular iron is much higher than that of gray iron. The thermal conductivity of vermicular iron is between gray iron and d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/08C22C37/10C21C1/08
Inventor 李长海范献兵
Owner JIANGSU JINSHI CASTING & FORGING
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