CN107805686A - A kind of high alloy steelmaking furnace bottom blowing nitrogen reinforcement process - Google Patents
A kind of high alloy steelmaking furnace bottom blowing nitrogen reinforcement process Download PDFInfo
- Publication number
- CN107805686A CN107805686A CN201711141951.0A CN201711141951A CN107805686A CN 107805686 A CN107805686 A CN 107805686A CN 201711141951 A CN201711141951 A CN 201711141951A CN 107805686 A CN107805686 A CN 107805686A
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- nitrogen
- intermediate frequency
- alloy
- frequency furnace
- furnace
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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
- C21C7/072—Treatment with gases
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/5241—Manufacture of steel in electric furnaces in an inductively heated furnace
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a kind of high alloy steelmaking furnace bottom blowing nitrogen reinforcement process, belong to automobile die field, including the first step：Dispensing, according to finished product cast or the requirement of parts chemical composition, steel scrap and alloy charge are added in intermediate frequency furnace, by controlling electric cabinet to adjust intermediate frequency furnace induced-current after molten steelization is clear, slag making is handled, keeps molten steel tapping temperature；Second step：Logical nitrogen, is passed through nitrogen, it is 0.5 0.6Mpa to be passed through nitrogen pressure, and is kept for certain time in the bottom of intermediate frequency furnace by nitrogen blowing device；3rd step：Constant temperature and deoxidation；4th step：Tapping casting.Present invention reinforcing effect is good, the implementation of above-mentioned technique, is particularly in steel alloy in high-alloy steel and forms nitride strengthening phase, on the basis of toughness of material is not reduced, improves the hardness and wearability of material.
Description
Technical field
The invention belongs to steel alloy processing technology field, is related to a kind of high alloy steelmaking furnace bottom blowing nitrogen reinforcement process.
Background technology
It is traditional to carry out the thinking of material reinforcement just by adding alloying element as metal material forms the development of thinking
Changing, gradually changing to economizing type, lustration type, microalloying, steel particularly higher to alloying elements content
Kind, expensive alloying elements content is reduced, original alloying element potential is excavated, is strengthened by nonmetalloid and sent out as metal material
A kind of trend of exhibition.
The nitrogen dissolved in molten steel separates out in process of setting because solubility reduces, and with Si, Al, Zr, Cr in steel etc.
The nitride such as element compounds, generation SiN, AlN, ZrN, CrN.Nitride can refine the crystal grain of steel, while nitrogen can improve the strong of steel
Degree, low-temperature flexibility and weldability, increase aging sensitivity.Meanwhile nitrogen also adversely affects to material, in high-temperature liquid state gold
Can dissolve substantial amounts of nitrogen in category, and the solubility due to nitrogen in steel process of setting declines, oversaturated nitrogen need with
The form of bubble escapes from metal, when the crystallization rate of liquid metal is more than the effusion speed of bubble, will be formed and caused
Stomata caused by crackle, therefore rationally control nitrogen addition is to maximize the key for playing nitrogen.
Metal nitride is a kind of intermetallic compound that N atoms are inserted into generated in metal lattice, and N atoms are inserted
Enter, cause metal lattice to expand, metal spacing and lattice constant become big, and the interaction force between metallic atom weakens, structure
Change therewith, this change, which acts on, causes metal nitride to be provided with special physical property, shows covalent compound, ion
The property of crystal and the class material of transition metal three, the existing metal nitride hardness of macroscopic body are generally higher than metal carbides hardness, this
A little properties cause nitrogen containing metal material to be with a wide range of applications.
The content of the invention
The problem to be solved in the present invention is to be to provide a kind of high alloy steelmaking furnace bottom blowing nitrogen reinforcement process, to realizing whirler
Structure power of tossing about is improved, spaces compact, and debugging is simple, and labor intensity is low, stability, safe.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of high alloy steelmaking furnace bottom blowing nitrogen strengthens work
Skill, including step once：The first step：Dispensing, according to finished product cast or the requirement of parts chemical composition, add in intermediate frequency furnace
Add steel scrap and alloy charge, by controlling electric cabinet to adjust intermediate frequency furnace induced-current after molten steelization is clear, slag making is handled, keep
Molten steel tapping temperature；
Second step：Logical nitrogen, is passed through nitrogen, being passed through nitrogen pressure is in the bottom of intermediate frequency furnace by nitrogen blowing device
0.5-0.6Mpa, when Cr, Mn, Si, Ti, Al total content are more than 10%, 3~6min/T of nitrogen flushing；When Cr, Mn, Si, Ti, Al are total
6~10min/T of nitrogen flushing when content is less than 10%；
3rd step：Constant temperature and deoxidation, molten steel tapping temperature is kept to stand 8-10min, according to tapping weight during standing
Add appropriate aluminium ingot or deoxidier and carry out 2-3 deoxidation treatment；
4th step：Tapping casting.
Further, the nitrogen blowing device includes air brick, support base, appendix, barometric damper and source nitrogen, institute
The lower end that support base is located at the intermediate frequency furnace between two parties is stated, the source nitrogen is supplied the intermediate frequency furnace by appendix
Nitrogen is answered, the barometric damper is located on the appendix and controls the opening and closing of the appendix, and the air brick is located at institute
State the upper end of intermediate frequency furnace.
Further, the source nitrogen is high-purity nitrogen source of the gas.
Further, it is 0.5-0.6Mpa to be passed through nitrogen pressure, when Cr, Mn, Si, Ti, Al total content are more than 10%, is blown
Nitrogen 5min/T, the nitrogen flushing 8min/T when Cr, Mn, Si, Ti, Al total content are less than 10%.
Compared with prior art, the present invention has the advantages and positive effects of：1st, present invention reinforcing effect is good, above-mentioned work
The implementation of skill, it is particularly in steel alloy in high-alloy steel and forms nitride strengthening phase, do not reducing the basis of toughness of material
On, improve the hardness and wearability of material；2nd, technique is simple, less to original foundry method improvement in practice operates, only
About 20min technological operation is added before tapping；3rd, cost is low, it is only necessary to intermediate frequency furnace is simply transformed, nitrogen into
This is relatively low.
Brief description of the drawings
The accompanying drawing for forming the part of the present invention is used for providing a further understanding of the present invention, schematic reality of the invention
Apply example and its illustrate to be used to explain the present invention, do not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the structural representation of nitrogen blowing device of the present invention.
Reference：
1- source nitrogens；2- barometric dampers；3- appendixs；4- support bases；5- intermediate frequency furnaces；6- air bricks.
Embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " on ", " under ",
The orientation or position relationship of the instruction such as "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer " are
Based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than instruction or dark
Show that the device of meaning or element there must be specific orientation, with specific azimuth configuration and operation, thus it is it is not intended that right
The limitation of the present invention.In addition, term " first ", " second " etc. are only used for describing purpose, and it is not intended that instruction or hint phase
To importance or the implicit quantity for indicating indicated technical characteristic.Thus, the feature for defining " first ", " second " etc. can
To express or implicitly include one or more this feature.In the description of the invention, unless otherwise indicated, " multiple "
It is meant that two or more.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can
To be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, above-mentioned term can be understood by concrete condition
Concrete meaning in the present invention.
The specific embodiment of the present invention is elaborated below in conjunction with the accompanying drawings.
The present invention is a kind of high alloy steelmaking furnace bottom blowing nitrogen reinforcement process, including step once：The first step：Dispensing, according into
Product casting or the requirement of parts chemical composition, add steel scrap and alloy charge in intermediate frequency furnace 5, treat that molten steelization is clear, slag making
By controlling electric cabinet to adjust the induced-current of intermediate frequency furnace 5 after processing, molten steel tapping temperature is kept；
Second step：Logical nitrogen, is passed through nitrogen, being passed through nitrogen pressure is in the bottom of intermediate frequency furnace 5 by nitrogen blowing device
0.5-0.6Mpa, when Cr, Mn, Si, Ti, Al total content are more than 10%, 3~6min/T of nitrogen flushing；When Cr, Mn, Si, Ti, Al are total
6~10min/T of nitrogen flushing when content is less than 10%, it is preferable that it is 0.5-0.6Mpa to be passed through nitrogen pressure, as Cr, Mn, Si, Ti, Al
Total content be more than 10% when, nitrogen flushing 5min/T, when Cr, Mn, Si, Ti, Al total content be less than 10% when nitrogen flushing 8min/T, when Cr,
Mn, Si, Ti, Al be with nitrogen chemical combination sensitive elements, content be more than 10% when, can with nitrogen fast reaction generate nitride,
To avoid excessive chemical combination nitrogen, the nitrogen flushing time is shorter, avoids the solubility of nitrogen during solidification from reducing precipitation and forms stomata, conversely contains
When amount is less than 10%, the chemical combination of alloying element and nitrogen occurs relatively slow, and nitrogen is lifted by the increase of nitrogen flushing time
Dissolving, in real process, Ti, Al and N element chemical combination are strong, and when total alloying element reaches 10%, N solubility has larger
Lifting.
3rd step：Constant temperature and deoxidation, after the completion of nitrogen is passed through, source nitrogen 1 is first closed, rear closed gas flow regulating valve 2 is stable
Induced-current, molten steel tapping temperature is kept to stand 8-10min, tapping temperature corresponding to different materials is different, according to material
Physical property determines that adding appropriate aluminium ingot or deoxidier according to tapping weight during standing carries out 2-3 deoxidation treatment；
4th step：Tapping casting, the Technology for Heating Processing of casting are formulated according to the specific composition of casting and shape.
Preferably, as shown in figure 1, nitrogen blowing device includes air brick 6, support base 4, appendix 3, the and of barometric damper 2
Source nitrogen 1, support base 4 are located at the lower end of intermediate frequency furnace 5 between two parties, and source nitrogen 1 is supplied intermediate frequency furnace 5 by appendix 3
Nitrogen is answered, barometric damper 2 is located on appendix 3 and controls the opening and closing of appendix 3, and air brick 6 is located at the upper of intermediate frequency furnace 5
End；It is highly preferred that source nitrogen 1 is high-purity nitrogen source of the gas 1.
Embodiment 1：
The present embodiment makes die insert, specific composition using the 50kg intermediate frequency furnaces 5 that nitrogen blowing device is added after transformation
For Cr12MoV.
The die insert preparation method of the present embodiment comprises the following steps：
1. configuring furnace charge according to composition and weight demands, induced-current is adjusted after changing clear, slag making, makes molten steel stable 1580
℃；
2. opening source nitrogen 1 and barometric damper 2, adjustment nitrogen is passed through pressure to 0.5Mpa, blowing in second step
Nitrogen principle nitrogen flushing 15S；
3. closing source nitrogen 1 and barometric damper 2, keep molten steel is stable to stand 10min at 1580 DEG C, add appropriate aluminium ingot
Carry out deoxidation treatment twice；
4. tapping casting, after cooling down sand removal, carry out oil quenching and lonneal processing.
The die insert as obtained by above-mentioned preparation method, case hardness can reach HRC63, the part Nitrizing Treatment after shaping
Between hardness can reach HRC55~58 afterwards, this case hardness for preparing scheme greatly promotes, can by transmission electron microscope spot-analysis
Detect that organization internal forms CrN hard phases；Abrasive wear contrast and experiment shows, carry out the Cr12MoV of nitrogen flushing processing compared with
The Cr12MoV for not carrying out nitrogen flushing processing is weightless than reducing about 15%, i.e. wear resistance lifting about 15%.
Embodiment 2：
The present embodiment makes grinder hammerhead, specific composition using the 1T intermediate frequency furnaces 5 that nitrogen blowing device is added after transformation
For Cr26Mo1.
The die insert preparation method of the present embodiment comprises the following steps：
1. configuring furnace charge according to composition and weight demands, induced-current is adjusted after changing clear, slag making, makes molten steel stable 1600
℃；
2. opening source nitrogen 1 and barometric damper 2, adjustment nitrogen is passed through pressure to 0.5Mpa, blowing in second step
Nitrogen principle nitrogen flushing 5min；
3. closing source nitrogen 1 and barometric damper 2, keep molten steel is stable to stand 15min at 1600 DEG C, add appropriate aluminium ingot
Carry out deoxidation treatment twice；
4. tapping casting, after cooling down sand removal, carries out air-cooled processing.
The grinder hammerhead as obtained by above-mentioned preparation method, case hardness can reach HRC62, at the part nitriding after shaping
Between hardness can reach HRC55~58 after reason, this case hardness for preparing scheme greatly promotes, and passes through transmission electron microscope spot-analysis
Detectable organization internal forms more CrN hard phases；Abrasive wear contrast and experiment is shown, carries out nitrogen flushing processing
The Cr26Mo1 that Cr26Mo1 does not carry out nitrogen flushing processing is weightless than reducing about 20%, i.e. wear resistance lifting about 20%.
The technique that nitrogen flushing is strengthened in this technique has started a kind of brand-new nitrogen pick-up reinforcement process, is not only useful in high-alloy steel
The manufacturing, nitrogen pick-up to other steel grades is strengthened equally applicable.
Embodiments of the invention are described in detail above, but the content is only presently preferred embodiments of the present invention,
It is not to be regarded as the practical range for limiting the present invention.Any changes and modifications in accordance with the scope of the present application,
All should still it belong within the patent covering scope of the present invention.
Claims (4)
1. a kind of high alloy steelmaking furnace bottom blowing nitrogen reinforcement process, it is characterised in that comprise the following steps：
The first step：Dispensing, according to finished product cast or the requirement of parts chemical composition, steel scrap and alloy are added in intermediate frequency furnace
Furnace charge, by controlling electric cabinet to adjust intermediate frequency furnace induced-current after molten steelization is clear, slag making is handled, keep molten steel tapping temperature
Degree；
Second step：Logical nitrogen, is passed through nitrogen, it is 0.5- to be passed through nitrogen pressure in the bottom of intermediate frequency furnace by nitrogen blowing device
0.6Mpa, when Cr, Mn, Si, Ti, Al total content are more than 10%, 3~6min/T of nitrogen flushing；When Cr, Mn, Si, Ti, Al total content
6~10min/T of nitrogen flushing during less than 10%；
3rd step：Constant temperature and deoxidation, keep molten steel tapping temperature to stand 8-10min, added during standing according to tapping weight
Appropriate aluminium ingot or deoxidier carry out 2-3 deoxidation treatment；
4th step：Tapping casting.
A kind of 2. high alloy steelmaking furnace bottom blowing nitrogen reinforcement process according to claim 1, it is characterised in that：The nitrogen blowing device
Including air brick, support base, appendix, barometric damper and source nitrogen, the support base is located at the intermediate frequency sense between two parties
The lower end of stove is answered, the source nitrogen is located at institute by appendix to described intermediate frequency furnace the supply of nitrogen, the barometric damper
State on appendix and control the opening and closing of the appendix, the air brick is located at the upper end of the intermediate frequency furnace.
A kind of 3. high alloy steelmaking furnace bottom blowing nitrogen reinforcement process according to claim 2, it is characterised in that：The source nitrogen is
High-purity nitrogen source of the gas.
A kind of 4. high alloy steelmaking furnace bottom blowing nitrogen reinforcement process according to claim 1, it is characterised in that：It is passed through nitrogen pressure
For 0.5-0.6Mpa, when Cr, Mn, Si, Ti, Al total content are more than 10%, nitrogen flushing 5min/T, when Cr, Mn, Si, Ti, Al always contain
Nitrogen flushing 8min/T when amount is less than 10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711141951.0A CN107805686A (en) | 2017-11-16 | 2017-11-16 | A kind of high alloy steelmaking furnace bottom blowing nitrogen reinforcement process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711141951.0A CN107805686A (en) | 2017-11-16 | 2017-11-16 | A kind of high alloy steelmaking furnace bottom blowing nitrogen reinforcement process |
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| Publication Number | Publication Date |
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| CN107805686A true CN107805686A (en) | 2018-03-16 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202984467U (en) * | 2012-12-27 | 2013-06-12 | 河南恒美铝业有限公司 | Die with nitrogen flushing device |
| CN103361573A (en) * | 2012-03-30 | 2013-10-23 | 鞍钢股份有限公司 | 420MPa grade vanadium-containing nitrogen steel and production method thereof |
| WO2015189919A1 (en) * | 2014-06-10 | 2015-12-17 | 日立金属株式会社 | Process for producing maraging steel |
| JP2017057461A (en) * | 2015-09-16 | 2017-03-23 | 日本冶金工業株式会社 | Fe-Cr-Ni-BASED ALLOY EXCELLENT IN HIGH TEMPERATURE STRENGTH |
| CN106636858A (en) * | 2016-10-24 | 2017-05-10 | 江苏星火特钢有限公司 | Method for producing high-anticorrosive high-nitrogen super austenitic stainless steel |
-
2017
- 2017-11-16 CN CN201711141951.0A patent/CN107805686A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103361573A (en) * | 2012-03-30 | 2013-10-23 | 鞍钢股份有限公司 | 420MPa grade vanadium-containing nitrogen steel and production method thereof |
| CN202984467U (en) * | 2012-12-27 | 2013-06-12 | 河南恒美铝业有限公司 | Die with nitrogen flushing device |
| WO2015189919A1 (en) * | 2014-06-10 | 2015-12-17 | 日立金属株式会社 | Process for producing maraging steel |
| JP2017057461A (en) * | 2015-09-16 | 2017-03-23 | 日本冶金工業株式会社 | Fe-Cr-Ni-BASED ALLOY EXCELLENT IN HIGH TEMPERATURE STRENGTH |
| CN106636858A (en) * | 2016-10-24 | 2017-05-10 | 江苏星火特钢有限公司 | Method for producing high-anticorrosive high-nitrogen super austenitic stainless steel |
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Application publication date: 20180316 |