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High manganese steel casting grain refinement casting technique

A casting process, high-manganese steel technology, applied in the direction of manufacturing tools, casting equipment, metal processing equipment, etc., can solve the problems of micro-cracks, coarse grains, looseness, etc., to increase grain refinement, grain refinement, The effect of reducing the production cycle

Active Publication Date: 2010-06-09
中科西王特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a fine-grained casting process for high-manganese steel castings, which solves the problems of high-manganese steel castings, such as coarse grains, looseness, and micro-cracks, and produces high-manganese steel with fine grains and high strength. Castings; the use of advanced alloying technology and metal particles to accelerate the cooling technology of castings has improved the material properties, and the mechanical properties of high manganese steel frogs have been greatly improved, σ b ≥850MPa, ak≥240J / cm 2 , δ≥45%

Method used

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  • High manganese steel casting grain refinement casting technique
  • High manganese steel casting grain refinement casting technique
  • High manganese steel casting grain refinement casting technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Such as figure 2 As shown, use thermal insulation riser and thermal insulation covering agent. The temperature of the molten steel is 1580°C. It is refined in the refining ladle to remove the inclusions. The weight of the molten metal is 0.6 tons. The pouring time is 32 seconds. The pouring temperature is 1480°C. Pouring under the protection of argon. Add 5% of the total weight of molten steel from the pouring system during the pouring process, and the size is 2mm metal particles, the metal particles are ZG 55, and the metal particle temperature is 180°C; the metal particles start to be added when the casting is poured for 11 seconds, and the metal particle addition time is 12 seconds. The casting adopts the hot boxing process, and the thermal cutting riser is cut by gas cutting method. The temperature of the thermal cutting riser is 650°C. After cutting, it is sent to the heat treatment kiln for homogenization treatment. The homogenization temperature is 1080°C and...

Embodiment 2

[0049] The difference from Example 1 is:

[0050] Such as figure 2 As shown, use thermal insulation riser and thermal insulation covering agent. The temperature of the molten steel is 1560°C. It is refined in the refining ladle to remove inclusions. The weight of the molten metal is 0.6 tons. The pouring time is 30 seconds. The pouring temperature is 1470°C. Add 2% of the total weight of molten steel from the pouring system during the pouring process, and the size is 5mm metal particles, the metal particles are ZG65, and the metal particle temperature is 245°C; the metal particles start to be added when the casting is poured for 10 seconds, and the metal particle addition time is 14 seconds. The casting adopts the hot-boxing process, and the hot-cut riser is cut by gas cutting method. The temperature of the hot-cut riser is 630°C. After cutting, it is sent to the heat treatment kiln for homogenization treatment. The homogenization temperature is 1075°C and the holding time...

Embodiment 3

[0054] The difference from Example 1 is:

[0055] Such as figure 2 As shown, use thermal insulation riser and thermal insulation covering agent. The temperature of the molten steel is 1590°C. It is refined in the refining ladle to remove inclusions. The weight of the molten metal is 0.6 tons. The pouring time is 28 seconds. The pouring temperature is 1480°C. Add 1.5% of the total weight of molten steel from the pouring system during the pouring process, and the size is 10mm metal particles, the metal particles are ordinary high manganese steel, the temperature of the metal particles is 320°C; the metal particles start to be added when the casting is poured for 14 seconds, and the metal particle addition time is 8 seconds. The casting adopts the hot boxing process, and the thermal cutting riser is cut by gas cutting method. The temperature of the thermal cutting riser is 600°C. After cutting, it is sent to the heat treatment kiln for homogenization treatment. The homogeniza...

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Abstract

The invention relates to high manganese steel casting grain-refining manufacturing technology, in particular to a method for grain-refining, casting and processing the high manganese steel casting, which comprises the following steps: (1) liquid steel is discharged from a furnace at a high temperature of 1580+20DEG C; the discharged liquid steel is subjected to argon blowing outside the furnace, wire feeding and refining; the phosphorus content and the sulfur content are respectively controlled to P is less than or equal to 0.025% and S is less than or equal to 0.018%; and the casting temperature is 1480 plus or minus 20DEG C; (2)in the injecting course of the high manganese steel casting, metal grains with weight ratio of 0.5-1.0% and size of phi 0.5-10mm are added along with molten metal; (3) the metal grains are added from the feed system of the casting, and preheating temperature of the metal grains is 150DEG C-350DEG C; and (4) rapid injecting the casting, and adopting a bottom pour ladle to avoid inclusion. In the course of injecting, metal grains are added, the temperature of the molten metal is reduced, and nucleating particle thinning grains are added, thereby solving theproblems of thick and loose high manganese steel casting grains, micro-crack, etc., and producing the high manganese casting with thinning grain and high strength.

Description

technical field [0001] The invention relates to a fine-grained manufacturing technology for high manganese steel castings, in particular to a fine-grained casting process for high manganese steel castings. Background technique [0002] At present, high manganese steel castings are widely used, especially in mines and railways. However, the coarse grains of high manganese steel castings seriously affect the performance of high manganese steel. The grains of high manganese steel castings are coarse, so that the inclusions and low melting point substances in the castings are enriched on the grain boundaries, which reduces the strength of the castings, resulting in defects such as peeling and cracks in the high manganese steel castings during use, which seriously affects the quality of the castings. service life. Railway frogs are high-manganese steel castings, and fine-grained technology is particularly important for high-manganese steel frogs. In the past, due to the coarse...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D21/00C21C7/04B22D37/00
Inventor 傅排先康秀红夏立军李殿中李依依
Owner 中科西王特钢有限公司
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