Arc furnace steel-making method capable of effectively preventing steel part surface from cracking
A surface cracking and electric arc furnace technology, applied in electric furnaces, improving process efficiency, furnaces, etc., can solve problems such as surface cracking of steel castings, and achieve the effects of large specific gravity, saving smelting time, and coarse particle size.
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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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