CN111378892A - Low-impurity ultralow-carbon stainless steel manufacturing process - Google Patents
Low-impurity ultralow-carbon stainless steel manufacturing process Download PDFInfo
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- CN111378892A CN111378892A CN202010325953.0A CN202010325953A CN111378892A CN 111378892 A CN111378892 A CN 111378892A CN 202010325953 A CN202010325953 A CN 202010325953A CN 111378892 A CN111378892 A CN 111378892A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0025—Adding carbon material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
- C21C7/0685—Decarburising of stainless steel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a manufacturing process of ultra-low carbon stainless steel with impurities, which comprises the steps of ① pre-treated molten iron, ② adding 50kg of lime, 30kg of dolomite and 10kg of ferrosilicon into each ton of molten iron for AOD refining, carrying out decarburization treatment, wherein the decarburization target is less than or equal to 0.012%, the oxygen ratio of argon is 4:1, the oxygen flow is 900M 3/H-1000M 3/H, the furnace temperature of ③ is more than or equal to 1700 ℃, sampling, detecting that the decarburization reaches the target value, reducing and deoxidizing, adding aluminum, ferrosilicon, lime, fluorite, fire brick blocks, dolomite, pure argon blowing for more than 20 minutes, ④ sampling and full analysis, adding pure calcium for strong deoxidation, adding lime, fluorite and blowing argon in the whole process, feeding 1.5kg/t of pure calcium wire into ⑤ steel ladles, blowing argon for more than 15 minutes in a soft blowing manner, keeping the temperature at 1530-1550 ℃, carrying out die casting, wherein the carbon content of the obtained stainless steel is less than or equal to 0.02%, and the silicon content is less than or equal to 0.10%.
Description
Technical Field
The invention relates to a stainless steel production apartment, in particular to a manufacturing process of low-impurity ultralow-carbon stainless steel.
Background
The carbon content of the 18-10 stainless steel is less than or equal to 0.02 percent, the silicon content is less than or equal to 0.10 percent, and the aluminum content is less than or equal to 0.015 percent. If the performance of the stainless steel can be further improved by further reducing the contents of carbon and silicon in the stainless steel, and if the contents of impurities in the stainless steel are high, the performance of the stainless steel can be influenced. However, it is difficult to reduce the content of carbon, silicon and other impurities in the prior art. Therefore, the technical problem is solved by the skilled person in the art.
Disclosure of Invention
The invention aims to provide a manufacturing process of low-impurity ultralow-carbon stainless steel, which reduces the impurity and carbon content of the stainless steel, improves the performance of the stainless steel, prolongs the furnace life and reduces the cost by using the structure.
In order to achieve the purpose, the invention adopts the technical scheme that: a manufacturing process of low-impurity ultra-low-carbon stainless steel comprises the following steps:
① preprocessing molten iron, preprocessing the molten iron by a molten iron intermediate frequency induction furnace according to the following components by mass percent, P is less than or equal to 0.023%, S is less than or equal to 0.020%, Cr is 18-19%, Ni is 9-9.5%, V is less than or equal to 0.05%, Co is less than or equal to 0.05%, the rest is Fe and inevitable impurities, and the temperature of the molten iron is more than or equal to 1550 ℃;
②, adding the pretreated molten iron into AOD for refining, adding 50kg of lime, 30kg of dolomite and 10kg of ferrosilicon into each ton of molten iron for decarburization treatment, wherein the decarburization target is less than or equal to 0.012 percent, the oxygen argon is 4:1, and the oxygen flow is 900M 3/H-1000M 3/H;
③, the furnace temperature is more than or equal to 1700 ℃, the sampling detection decarburization reaches the target value, the reduction deoxidation is carried out, 1.5kg/t of aluminum, 30kg/t of silicon iron, 25kg/t of lime, 10kg/t of fluorite, 5kg/t of firebrick blocks and 10kg/t of dolomite are added, and the pure argon blowing is carried out for more than 20 minutes;
④, sampling and analyzing completely, after 95% of slag is pulled, adding 3kg/t of pure calcium for strong deoxidation at the temperature of more than 1680 ℃, adding 15kg/t of lime and 5kg/t of fluorite, blowing argon in the whole process, wherein the argon blowing flow is 800M3/H, finely adjusting the components of each element to meet the requirements of technical conditions, and the temperature is 1660-1680 ℃;
⑤ feeding pure calcium wire 1.5kg/t in the ladle, adding low carbon covering agent to the molten steel for heat preservation, covering with heat preservation cotton cover, reducing the cooling speed in one minute, blowing argon gas for 15 minutes, keeping the temperature at 1530-1550 ℃, and then die casting to obtain the stainless steel with carbon content less than or equal to 0.02% and silicon content less than or equal to 0.10%.
In the above technical solution, in the step ⑤, the die-cast runner brick is made of mullite, a casting system is provided with a paraffin paper ring, and the casting is performed under the protection of argon gas in the whole process.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
1. according to the invention, the content of carbon and silicon in the steel is effectively reduced by increasing the flow of oxygen, and the performance of the steel is improved;
2. according to the invention, dolomite is added, so that the dolomite is decomposed into magnesium oxide and calcium oxide at high temperature, part of lime (calcium oxide) is replaced, and simultaneously, the precipitation of magnesium in the AOD refractory calcium-magnesium brick is reduced, the furnace life is effectively improved, compared with the previous furnace life of 30 furnaces, the furnace life can be improved to 40 furnaces, and the cost is effectively reduced;
3. according to the invention, the fire brick blocks contain silicon and aluminum, the furnace slag is adjusted to avoid single fluorite slag, the fluidity of the furnace slag is maintained under the condition of not reducing the alkalinity, the floating impurities are convenient to adsorb, and the impurities are reduced.
Detailed Description
The invention is further described below with reference to the following examples:
the first embodiment is as follows: a manufacturing process of low-impurity ultra-low-carbon stainless steel comprises the following steps:
① preprocessing molten iron, preprocessing the molten iron by a molten iron intermediate frequency induction furnace according to the following components by mass percent, P is less than or equal to 0.023%, S is less than or equal to 0.020%, Cr is 18-19%, Ni is 9-9.5%, V is less than or equal to 0.05%, Co is less than or equal to 0.05%, the rest is Fe and inevitable impurities, and the temperature of the molten iron is more than or equal to 1550 ℃;
②, adding the pretreated molten iron into AOD for refining, adding 50kg of lime, 30kg of dolomite and 10kg of ferrosilicon into each ton of molten iron for decarburization treatment, wherein the decarburization target is less than or equal to 0.012 percent, the oxygen argon is 4:1, and the oxygen flow is 900M 3/H-1000M 3/H;
③, the furnace temperature is more than or equal to 1700 ℃, the sampling detection decarburization reaches the target value, the reduction deoxidation is carried out, 1.5kg/t of aluminum, 30kg/t of silicon iron, 25kg/t of lime, 10kg/t of fluorite, 5kg/t of firebrick blocks and 10kg/t of dolomite are added, and the pure argon blowing is carried out for more than 20 minutes;
④, sampling and analyzing completely, after 95% of slag is pulled, adding 3kg/t of pure calcium for strong deoxidation at the temperature of more than 1680 ℃, adding 15kg/t of lime and 5kg/t of fluorite, blowing argon in the whole process, wherein the argon blowing flow is 800M3/H, finely adjusting the components of each element to meet the requirements of technical conditions, and the temperature is 1660-1680 ℃;
⑤ feeding pure calcium wire 1.5kg/t in the ladle, adding low carbon covering agent to the molten steel for heat preservation, covering with heat preservation cotton cover, reducing the cooling speed in one minute, blowing argon gas for 15 minutes, keeping the temperature at 1530-1550 ℃, and then die casting to obtain the stainless steel with carbon content less than or equal to 0.02% and silicon content less than or equal to 0.10%.
According to the invention, in the step ②, the content of oxygen is large, and the content of oxygen is large, so that the content of silicon and aluminum is low, meanwhile, through the addition of dolomite, dolomite is decomposed into magnesium oxide and calcium oxide at high temperature, the magnesium is reduced in AOD refractory magnesia-calcium bricks while replacing a part of lime (calcium oxide), the furnace life is effectively improved, the original furnace life is 30 furnaces, the current furnace life is 40 furnaces, the firebrick blocks contain silicon and aluminum, the furnace slag is adjusted to avoid single crystal slag, the fluidity of the furnace slag is maintained under the condition of not reducing alkalinity, floating impurities are adsorbed, impurities are reduced, because ultra-low carbon cannot enter LF (ladle furnace) for heating, a deoxidizer generally contains silicon and aluminum components, 1.5kg per ton of pure calcium wire is fed after tapping, deoxidation and desulfurization are carried out, meanwhile, a low-carbon covering agent is added to preserve heat, a heat preservation cotton cover is added to effectively preserve heat, the temperature is reduced within one minute, the temperature reduction speed is reduced, argon is calmed for more than 10 minutes, and the inclusion is increased to more than 15 minutes, so that the steel floats after mixed flushing is facilitated, the impurities are.
In the step ⑤, the die casting runner brick is made of mullite, a casting system is provided with a paraffin paper ring, and argon is poured in a whole-process protection manner.
Claims (2)
1. A manufacturing process of low-impurity ultra-low-carbon stainless steel comprises the following steps:
① preprocessing molten iron, preprocessing the molten iron by a molten iron intermediate frequency induction furnace according to the following components by mass percent, P is less than or equal to 0.023%, S is less than or equal to 0.020%, Cr is 18-19%, Ni is 9-9.5%, V is less than or equal to 0.05%, Co is less than or equal to 0.05%, the rest is Fe and inevitable impurities, and the temperature of the molten iron is more than or equal to 1550 ℃;
②, adding the pretreated molten iron into AOD for refining, adding 50kg of lime, 30kg of dolomite and 10kg of ferrosilicon into each ton of molten iron for decarburization treatment, wherein the decarburization target is less than or equal to 0.012 percent, the oxygen argon is 4:1, and the oxygen flow is 900M 3/H-1000M 3/H;
③, the furnace temperature is more than or equal to 1700 ℃, the sampling detection decarburization reaches the target value, the reduction deoxidation is carried out, 1.5kg/t of aluminum, 30kg/t of silicon iron, 25kg/t of lime, 10kg/t of fluorite, 5kg/t of firebrick blocks and 10kg/t of dolomite are added, and the pure argon blowing is carried out for more than 20 minutes;
④, sampling and analyzing completely, after 95% of slag is pulled, adding 3kg/t of pure calcium for strong deoxidation at the temperature of more than 1680 ℃, adding 15kg/t of lime and 5kg/t of fluorite, blowing argon in the whole process, wherein the argon blowing flow is 800M3/H, finely adjusting the components of each element to meet the requirements of technical conditions, and the temperature is 1660-1680 ℃;
⑤ feeding pure calcium wire 1.5kg/t in the ladle, adding low carbon covering agent to the molten steel for heat preservation, covering with heat preservation cotton cover, reducing the cooling speed in one minute, blowing argon gas for 15 minutes, keeping the temperature at 1530-1550 ℃, and then die casting to obtain the stainless steel with carbon content less than or equal to 0.02% and silicon content less than or equal to 0.10%.
2. The process for manufacturing the low-impurity ultra-low carbon stainless steel according to claim 1, wherein in the step ⑤, the die-cast steel brick is made of mullite, a casting system is provided with a paraffin paper ring, and the casting is carried out under the protection of argon.
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| CN202010325953.0A CN111378892A (en) | 2020-04-23 | 2020-04-23 | Low-impurity ultralow-carbon stainless steel manufacturing process |
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| CN202010325953.0A CN111378892A (en) | 2020-04-23 | 2020-04-23 | Low-impurity ultralow-carbon stainless steel manufacturing process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113502372A (en) * | 2021-05-26 | 2021-10-15 | 山东鲁丽钢铁有限公司 | Rapid white slag making material for 120tLF refining furnace and process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4708738A (en) * | 1986-04-01 | 1987-11-24 | Union Carbide Corporation | Method for refining very small heats of molten metal |
| CN1563463A (en) * | 2004-03-23 | 2005-01-12 | 宝钢集团上海五钢有限公司 | Manufactring method for smelting stainless steel containing N biphase |
| CN101403077A (en) * | 2008-11-08 | 2009-04-08 | 山西太钢不锈钢股份有限公司 | Biphase stainless steel and method for making same |
| CN105624357A (en) * | 2016-03-16 | 2016-06-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Stainless steel AOD converter steelmaking technology using nickel protoxide ball for direct reductive alloying |
-
2020
- 2020-04-23 CN CN202010325953.0A patent/CN111378892A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4708738A (en) * | 1986-04-01 | 1987-11-24 | Union Carbide Corporation | Method for refining very small heats of molten metal |
| CN1563463A (en) * | 2004-03-23 | 2005-01-12 | 宝钢集团上海五钢有限公司 | Manufactring method for smelting stainless steel containing N biphase |
| CN101403077A (en) * | 2008-11-08 | 2009-04-08 | 山西太钢不锈钢股份有限公司 | Biphase stainless steel and method for making same |
| CN105624357A (en) * | 2016-03-16 | 2016-06-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Stainless steel AOD converter steelmaking technology using nickel protoxide ball for direct reductive alloying |
Non-Patent Citations (4)
| Title |
|---|
| 徐文派等: "《转炉炼钢学》", 30 April 1988, 冶金工业出版社 * |
| 曹晓明等: "《先进结构材料》", 30 April 2005, 化学工业出版社 * |
| 朱苗勇等: "《现代冶金工艺学 钢铁冶金卷 第2版》", 31 December 2016, 冶金工业出版社 * |
| 郭海军: "《钙邦崛起》", 31 August 2017, 冶金工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113502372A (en) * | 2021-05-26 | 2021-10-15 | 山东鲁丽钢铁有限公司 | Rapid white slag making material for 120tLF refining furnace and process |
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