CN1109770C - Technology for smelting high-quality mandrel steel - Google Patents
Technology for smelting high-quality mandrel steel Download PDFInfo
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- CN1109770C CN1109770C CN00127574A CN00127574A CN1109770C CN 1109770 C CN1109770 C CN 1109770C CN 00127574 A CN00127574 A CN 00127574A CN 00127574 A CN00127574 A CN 00127574A CN 1109770 C CN1109770 C CN 1109770C
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Abstract
The present invention relates to a technology for smelting high-quality mandrel steel. The technology comprises the following steps: (1) desulfurizing molten iron to obtain desulfurized molten iron; (2) blowing the desulfurized molten iron in an LD converter to make tapping alloy components close to the lower limit of target values; (3) refining in an LF furnace, and then, desulfurizing by raising temperature to adjust the alloy components reach the target values; (4) treating in an RH device for alloy fine adjustment, dehydrogenation and molten steel purification; (5) casting steel ingots in moulds. The smelting technology and the production preparing operation are simple, and the yield of ferrochromium is high when the ferrochromium is added after the blowing smelting is finished. The technology has the advantages of high stability, low smelting cost and high product quality.
Description
The present invention relates to a kind of smelting technology of mandrel steel, particularly a kind of technology for smelting high-quality mandrel steel.
The push rod steel of using when mandrel steel is pipe mill's production weldless steel tube poling, the most remarkable composition characteristics of high-quality mandrel steel are exactly the alloy content height, general requirement [Si] 〉=0.95%, [Mn] 〉=0.30%, [Cr] 〉=5%, [V] 〉=0.35%, [Mo] 〉=1.15%, total alloy content surpasses 7.8%, particularly composition [Cr] has surpassed 5%, causes very big difficulty to smelting.Prior art generally adopts electric furnace production.Adopt converter to smelt having of mandrel steel, adopt following three kinds of smelting processes by means of sub-lance technique:
1. double slag process: converter is outwelled high P oxidation sludge after blowing for the first time, carries out the slag making again of blowing the second time.2. melt down method: first stove is a refining low-sulfur low-phosphorous raw steel, after the tapping, the molten steel in the ladle is blended into converter again adds ferrochrome and blow once more.3. three deferrization water laws: utilize three deferrization water, to alleviate the dephosphorization task of converter through the desiliconization of hot metal dephosphorization and desulfurization.These three kinds of methods can successfully be smelted mandrel steel, but this type of smelting technology needs the secondary slag making, melts down or prepares three deferrization water of desiliconization of hot metal desulfurization dephosphorization, the production preparation is complicated, loaded down with trivial details, workload is big, the smelting difficulty is big, the time of bessemerizing is long, the recovery rate of ferrochrome is low, unstable when adding ferrochrome in the converting process, and finished product composition qualification rate is also low.
The object of the present invention is to provide a kind of technology for smelting high-quality mandrel steel, production preparation work is simpler, and the recovery rate of ferrochrome is higher when adding ferrochrome in the converting process, and stable, and smelting cost is lower, and quality product is higher.
For achieving the above object, the present invention adopts following technical scheme:
A kind of technology for smelting high-quality mandrel steel, it is characterized in that comprising following operation: 1. desulfurizing iron, to obtain desulphurised hot metal, 2. LD bessemerizes, and the alloy ingredient that makes tapping is near the target value lower limit, 3. LF stove refining, the desulfurization that heats up is adjusted alloy ingredient and is reached target value, 4. handles in the RH device, 5. alloy fine setting dehydrogenation and purify hot metal are molded into steel ingot.
The desulfurizing iron operation is desulfurization according to a conventional method, makes [the S]≤50ppm of molten iron, and hot metal ratio is greater than 95%.
LD bessemerizes operation: earlier molybdenum-iron is added in the LD stove, be blended into desulphurised hot metal again; The blowing decarburization, dephosphorization and intensification, during blow off, control [C]=400～500ppm, [P]≤80ppm, temperature is 1680～1720 ℃; With addition of Mn, Si, Al alloying ingredient, make its composition in the tapping process near the target value lower limit, and with addition of the ferrochrome of finished product composition desired 65～75%.
LD bessemerizes in the operation, and tapping process carries out pushing off the slag, and carries out and stay the steel operation, and the quantity of slag is to prevent the rephosphorization of back operation under the strict control.
LD bessemerizes in the operation, and omnidistance bag argon bottom-blowing in the tapping process prevents that a large amount of alloys addings from causing the inhomogeneous and obstruction argon blowing hole of composition.
LF stove refining procedure is: adds the alloy slag charge, alloy ingredient reached in the target value, heat up simultaneously adjusting because of adding the cooling that the alloy slag charge causes, and carry out the slag making desulfurization, and control [S]≤40ppm, the ladle temperature is controlled to be 1580～1620 ℃ during this operation end.
Treatment process is to carry out alloy fine setting, the degassing and remove being mingled with in the RH device in the RH device, makes [H]≤2ppm, and the pure degassing time guarantees to be sequentially added into alloy greater than 8 minutes, and FeV in the end adds.
The die casting operation is to adopt the ingot mold of up big and down small band heat-insulating shield hot top to be molded into steel ingot.
The present invention has following outstanding feature and remarkable advantage compared with prior art: the present invention only need use desulphurised hot metal, and need not with three deferrization water, makes production preparation work simpler.Reduced the requirement of dephosphorization in the converter smelting, operation is more easily held, and most of ferrochrome can be adjusted behind stove, in the converter tapping process with addition of Mn, Si, Al alloying ingredient near the target value lower limit, and adding the ferrochrome of finished product required 65～75%, the recovery rate of ferrochrome is higher.Utilize the intensification and the alloy of LF stove to adjust function, making does not need three deferrization water, does not need the slag making of converter secondary, and ferrochrome reaches the LF stove and adds after converter, and the recovery rate of ferrochrome doubles many than prior art, and cost greatly reduces; Bring into play the desulfurization of LF stove simultaneously, adjust composition and temperature action, make the alloy addition of in the RH device, handling reduce, temperature is guaranteed before handling, make treating processes stable, improve final product quality, the content of its [S]+[P] can reach≤200ppm, reduce about 100ppm than prior art, and reach the level of high-quality mandrel steel.
Embodiment:
Present embodiment is bessemerized, is handled in the refining of LF stove, RH device by desulfurizing iron, LD and five operations of die casting are smelted the high-quality core and given steel, and the result is as shown in the table.The result who lists file names with the mandrel steel of smelting with the method for melting down, double slag process and three deferrization water laws in the table makes comparisons.
| C | Si | Mn | P | S | Cr | V | Al | Mo | H | N | |
| Target component % | 0.36～ 0.42 | 0.95～ 1.15 | 0.30～ 0.50 | ≤ 0.025 | ≤0.015 | 5.00～ 5.50 | 0.35～ 0.50 | 0.005 ～0.02 | 1.15～ 1.35 | ≤ 2ppm | ≤ 200 ppm |
| Present embodiment | 0.402 | 1.075 | 0.36 | 0.015 | 0.0035 | 5.18 | 0.415 | 0.020 | 1.18 | 1.4 ppm | 76 ppm |
| Melt down method | 0.403 | 1.02 | 0.33 | 0.015 | 0.012 | 5.06 | 0.40 | 0.014 | 1.20 | 1.9 ppm | 96 ppm |
| Double slag process | 0.396 | 1.075 | 0.40 | 0.029 | 0.011 | 5.08 | 0.45 | 0.007 | 1.25 | 1.6 ppm | 93 ppm |
| Three deferrization water laws | 0.360 | 1.058 | 0.38 | 0.030 | 0.008 | 5.14 | 0.408 | 0.013 | 1.19 | 1.0 ppm | 84 ppm |
Can find out from tabular language, adopt smelting technology provided by the invention, [S]+[P] dropped to 185ppm, obviously is better than existing smelting technology and (melts down [S]+[the P]=270ppm of method, [S] of double slag process+[P]=400ppm, [S] of three deferrization water laws+[P]=380ppm).
Adjust through smelting cost, the smelting cost of three deferrization water laws and smelting cost price difference of the present invention are 11.5 ten thousand yuan in every stove, and smelting cost of the present invention reduces greatly.
Claims (3)
1. technology for smelting high-quality mandrel steel is characterized in that comprising following operation: (1) desulfurizing iron:
Desulfurization according to a conventional method makes [the S]≤50ppm of molten iron, and hot metal ratio is greater than 95%, to obtain desulphurised hot metal; (2) LD bessemerizes: earlier molybdenum-iron is added in the LD stove, be blended into desulphurised hot metal again; Blowing decarburization, dephosphorization and intensification, during blow off, control [C]=400～500ppm, [P]≤80ppm, temperature is 1680～1720 ℃; With addition of Mn, Si, Al alloying ingredient, make its composition in the tapping process near the target lower limit, and with addition of the ferrochrome of finished product composition desired 65～75%; (3) LF stove refining: add the alloy slag charge, alloy ingredient is reached in the target value, heat up simultaneously adjusting because of adding the cooling that the alloy slag charge causes, and carry out the slag making desulfurization, control [S]≤40ppm, the ladle temperature is controlled to be 1580～1620 ℃ during this operation end; (4) handle in the RH device: carry out alloy fine setting, the degassing in the RH device and remove being mingled with, make [H]≤2ppm, the pure degassing time guarantees to be sequentially added into alloy greater than 8 minutes, and FeV in the end adds; (5) be molded into steel ingot: adopt the ingot mold of up big and down small band heat-insulating shield hot top to be molded into steel ingot.
2. technology for smelting high-quality mandrel steel according to claim 1 is characterized in that LD bessemerizes in the operation, and tapping process carries out pushing off the slag, and carries out and stay the steel operation, and the quantity of slag is to prevent the rephosphorization of back operation under the strict control.
3. technology for smelting high-quality mandrel steel according to claim 1 and 2 is characterized in that LD bessemerizes in the operation, and omnidistance ladle bottom blowing argon gas in the tapping process prevents that a large amount of alloys addings from causing the inhomogeneous and obstruction argon blowing hole of composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00127574A CN1109770C (en) | 2000-11-27 | 2000-11-27 | Technology for smelting high-quality mandrel steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00127574A CN1109770C (en) | 2000-11-27 | 2000-11-27 | Technology for smelting high-quality mandrel steel |
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| CN1300865A CN1300865A (en) | 2001-06-27 |
| CN1109770C true CN1109770C (en) | 2003-05-28 |
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| CN00127574A Expired - Lifetime CN1109770C (en) | 2000-11-27 | 2000-11-27 | Technology for smelting high-quality mandrel steel |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100436603C (en) * | 2007-03-28 | 2008-11-26 | 北京科技大学 | Process of deoxygenating, desulfurizing and controlling non-metal inclusion content in steel |
| CN101941021B (en) * | 2010-08-13 | 2013-05-08 | 济南钢铁股份有限公司 | Method for producing extra-deep drawing cold-rolled steel plate based on ASP process |
| CN106011594B (en) * | 2016-07-08 | 2017-09-29 | 首钢总公司 | A kind of smelting process of the anti-hydrogen induced cracking container steel of 245MPa grades of surrender |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU403329A1 (en) * | 1971-12-31 | 1980-05-25 | Институт Электросварки Им.Е.О.Патона Ан Украинской Сср | Dismountable cooled mandrel |
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- 2000-11-27 CN CN00127574A patent/CN1109770C/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU403329A1 (en) * | 1971-12-31 | 1980-05-25 | Институт Электросварки Им.Е.О.Патона Ан Украинской Сср | Dismountable cooled mandrel |
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