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Dead-melted steel ingot

A technology of killed steel and steel ingots, which is applied in the field of killed steel ingots, can solve the problems of restricting production of enterprises, high degradation rate, and impact on economic benefits, and achieve the effects of slowing down the solidification speed, high density, and eliminating cracking defects

Inactive Publication Date: 2011-06-01
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high degradation rate of steel ingots after rolling not only restricts the production of enterprises, but also has a great impact on the economic benefits of enterprises

Method used

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  • Dead-melted steel ingot
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  • Dead-melted steel ingot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment one: LZ50 variety

[0054] The steel ingot mold of the present embodiment is made of steel ingot mold, thermal insulation cap, thermal insulation liner plate, figure 1 , figure 2 , image 3 As shown, the steel ingot mold is a conical quadrangular truss with a "U" shape in the axial section. Arc, the arc of the outer wall edge 6 is formed by a circle with a radius of 290 mm, the arc angle of the inner wall is formed by a circle with a radius of 70 mm to 80 mm, and the arc angle 7 at the port 4 on the inner wall is formed by a radius of 80 mm The circumference of the millimeter constitutes, and the arc angle 8 at the bottom of the inner wall is composed of a circle with a radius of 70 millimeters. The bottom of the shell is provided with a circular hole 2 with a small upper opening and a large lower opening (the diameter of the upper opening is 165 millimeters, and the diameter of the lower opening is 175 millimeters). ), the arc-shaped bottom of the mold c...

Embodiment 2

[0062] Embodiment two: JZ35 variety

[0063] The steel ingot mold and steel ingot structure of this embodiment are the same as the first embodiment, the difference is partly in the pouring method: the temperature of the molten steel of the JZ35 variety is controlled at 1560°C, and then the pouring, following flow, increasing flow, and feeding are followed. The pouring starts in four stages, among which the pouring speed is 1.850 tons / minute, the following flow speed is 1.950 tons / minute, the increasing flow speed is 2.100 tons / minute, and the feeding speed (including medium and fine flow feeding) is 0.432 tons / minute. minute. The injection speed of the four-disk ingot body is 1.852 tons / min, and the cap opening is 0.444 tons / min; the injection speed of the three-spindle body is 1.710 tons / min, and the cap opening is 0.428 tons / min.

[0064] When the molten steel is injected to the height of 2 / 3 of the cap mouth, add a heating agent to add heating agent 12kg / piece. After the ...

Embodiment 3

[0066] Example three: 30CrMoA gas cylinder steel varieties

[0067] The steel ingot mold and steel ingot structure of this embodiment are the same as the first embodiment, the difference is partly in the pouring method: that is, the temperature of the molten steel of the 30CrMoA gas cylinder steel variety is controlled to 1565°C, and then the pouring, following flow, and increasing flow are followed. The pouring starts in the four stages of feeding and shrinkage, in which the pouring speed is 1.850 tons / minute, the following flow speed is 1.950 tons / minute, the increasing flow speed is 2.150 tons / minute, and the feeding and shrinking (including medium and fine flow feeding) speed is 0.395 tons / min. The injection speed of the four-coil ingot body is 1.952 tons / minute, and the cap mouth is 0.434 tons / minute; the injection speed of the three-spindle body is 1.830 tons / minute, and the cap mouth is 0.351 tons / minute.

[0068] When the molten steel is injected to the height of 2 / 3 ...

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Abstract

The invention discloses a steel ingot of piping steel as well as a die set and a pouring method thereof, belonging to metallurgic products and metallurgic techniques. The steel ingot is a subulate four-arris table, the conicity of the steel ingot is 3.4 divided by 100, and four arris of the steel ingot are arc arris that are composed of circles with radius of 70 to 80 millimeters; the die set is composed of a steel ingot die, a warm-keeping hat and a thermal insulating lining board, the steel ingot die is the subulate four-arris table that has a U-shaped axial cross section, the conicity of the steel ingot die is 3.4 divided by 100, outer wall arris and inner wall angles of the steel ingot die are all arc, the arc of the outer wall arris is composed of a circle with radius of 290 millimeters, and the arc inner wall angle is composed of the circle with radius of 70 to 80 millimeters; the pouring method is characterized in that the pouring temperature is 1540 to 1590 DEG C. The shaft steel rolled by the steel ingot that is produced by adopting the invention has the synthesized decision reducing rate of 1.77 to 2.00 percent in general and the proportion of 90.0 to 95.0 percent for the products in a common looseness level that is equal to or less than 2.0, thus improving the product quality of steel materials and the economical benefits of enterprises.

Description

Technical field: [0001] The invention belongs to a metallurgical product and a casting mold and casting method thereof. Background technique: [0002] At present, the killed steel ingots produced by various metallurgical enterprises have two specifications of 9.6t and 5.8t. The taper of the adjacent sides of these two ingots is different. The taper of the larger side of the 9.6t steel ingot is 3.4 / 100, and the taper of the smaller side is 3.3 / 100; the taper of the larger side of the 5.8t steel ingot is 2.6 / 100, and the smaller side The taper is 1.6 / 100. The aspect ratio of the 9.6t steel ingot is 2.86; the aspect ratio of the 5.8t steel ingot is 2.89. The above two specifications of steel ingots have a high rate of degradation due to flaw detection, low magnification, and substandard surface after rolling. For example, the rate of degradation of axle steel varieties after rolling is generally 4.75% to 6.53%. The high degradation rate of steel ingots after rolling not only ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D7/00B22D7/06B22D35/04
Inventor 宁晋荣罗红卫王玉玲郝旭明
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD