An electric arc furnace steelmaking method capable of effectively eliminating surface cracks of steel castings

A surface cracking and electric arc furnace technology, applied in electric furnace, process efficiency improvement, furnace and other directions, can solve problems such as surface cracking of steel castings, and achieve the effects of large specific gravity, shortened smelting time, and rapid deoxidization.

Inactive Publication Date: 2011-12-14
WUHAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The technical problem to be solved by the present invention is to provide an electric arc furnace steelmaking method to effectively solve the problem of cracks on the surface of steel castings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Brand: ZG200-400C Smelting heat: 08346 Molten steel volume: 7800kg

[0051] Pouring products: see Table 1.

[0052] crafting process:

[0053] Ingredients: carbon steel pouring, riser 4000kg, scrap steel 3800kg, recarburizer 60kg

[0054] The smelting records are as follows;

[0055] 24:25 Loading 4700kg,

[0056] 24; 30 power transmission 210V,

[0057] 1:25 tow furnace feed 2100kg,

[0058] 1:55 1000kg of drag furnace feed,

[0059] 2:20 oxygen blowing fluxing,

[0060] 2: 28 sampling ①,

[0061] 2:35 oxygen blowing oxidation,

[0062] 2:55 sampling ②,

[0063] 3:00 Remove slag, add 55kg of ferromanganese, add slag (lime: fluorite = 3:1) about 1.5%,

[0064] 3:07 Add 1% reduction slag, add FeSi75 about 50kg, sprinkle silicon carbide 20kg,

[0065] 3:15 stirring and sampling ③,

[0066] 3:17 temperature measurement 1639 ℃,

[0067] 3: 20 sprinkle silicon carbide 10kg,

[0068] 3: 28 add ferromanganese 5kg,

[0069] 3:33 aluminum deoxidation tapping,

[...

Embodiment 2

[0075] Material: carbon steel Grade: ASTM A352 GRADE LCC Smelting heat: 08327 Liquid steel volume: 8200kg

[0076] Pouring products: see Table 3.

[0077] crafting process:

[0078] Ingredients: carbon steel pouring, riser 4100kg, scrap steel 4200kg, recarburizer 70kg

[0079] The smelting records are as follows;

[0080] 21:30 loading 6300kg,

[0081] 22:00 power transmission 210V,

[0082] 23:25 Add 2000kg to the furnace,

[0083] 23:45 Oxygen blowing and fluxing,

[0084] 23:55 sampling ①,

[0085] 23:58 plus ore oxidation,

[0086] 24:05 oxygen blowing oxidation,

[0087] 24:30 sampling ②,

[0088] 24:38 Remove slag, add ferromanganese (110 kg) and add thin slag (lime: fluorite = 3: 1) about 1.5%,

[0089] 24:43 plus 1% reduction slag (lime: silicon carbide = 4:1),

[0090] 24:50 Add 50kg of ferrosilicon, sprinkle 15kg of silicon carbide,

[0091] 24:58 stirring and sampling ③,

[0092] 1:00 temperature measurement 1621 ℃,

[0093] 1:02 Sprinkle 10kg of carbo...

Embodiment 3

[0100] Material: low alloy steel Grade: EH36 Smelting heat: 08578 Liquid steel volume: 7000kg

[0101] Pouring product situation: see Table 5.

[0102] crafting process:

[0103] Ingredients: carbon steel pouring, riser 4100kg, scrap steel 2900kg, recarburizer 60kg

[0104] The smelting records are as follows;

[0105] 24:30 Loading 5100kg,

[0106] 24:35 power transmission 210V,

[0107] 1:45 1900kg of drag furnace feed,

[0108] 2:10 oxygen blowing fluxing,

[0109] 2: 20 sampling ①,

[0110] 2:25 plus ore oxidation,

[0111] 2:35 oxygen blowing oxidation,

[0112] 2: 50 sampling ②,

[0113] 3:00 Remove slag, add ferromanganese (105kg) and add slag (lime: fluorite = 3: 1) about 1.5%,

[0114] 3:05 plus 1% reducing slag (lime: silicon carbide = 4:1),

[0115] 3:13 Add 45kg of ferrosilicon, sprinkle 10kg of silicon carbide,

[0116] 3:20 stirring and sampling ③,

[0117] 3:21 temperature measurement 1618 ℃,

[0118] 3:22 Sprinkle toner 10kg,

[0119] 3:30 Add 7k...

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Abstract

The invention discloses an arc furnace steel-making method capable of effectively preventing steel part surface from cracking. The method improves smelting technology, uses carborundum as deoxidant for reduction for arc furnace steel making, combines a packet cutting-in method, and adopts yttrium base heavy rare earth ferro-silicon alloy to purify molten steel. The method comprises the steps of reducing, deoxidizing, sampling, purifying molten steel with the packet cutting-in method and pouring. The method provided by the invention can effectively reduce cast steel surface cracking phenomenon, improves the quality and the production efficiency of the cast steel, is an innovation of production technology and industrial application effect, and can make contribution for improving the comprehensive economic benefit of arc furnace steel making.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to an electric arc furnace steelmaking method capable of effectively eliminating surface cracks of steel castings. Background technique [0002] In recent years, with the continuous improvement of customer acceptance standards and the requirements of various classification societies, marine steel castings encountered unqualified surface magnetic particle inspection quality during the inspection process. Despite repeated grinding and welding repairs, there are still a large number of small cracks that are difficult to eliminate. Aiming at this quality problem in the production of steel castings, some measures have been tried, such as adjusting and improving the molding process, unpacking time and method, heat treatment process and other processes, but they still cannot effectively improve the quality of cracking on the surface of steel castings. Analysis of the microstructure of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/52C21C7/06C21C7/064
CPCY02P10/20
Inventor 范晓明文红艳喻尚钟魏瑛万福祥何刚于建才
Owner WUHAN UNIV OF TECH
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