CN109371199A - The method for refining 21-4N heat resisting steel carbide - Google Patents
The method for refining 21-4N heat resisting steel carbide Download PDFInfo
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- CN109371199A CN109371199A CN201811319210.1A CN201811319210A CN109371199A CN 109371199 A CN109371199 A CN 109371199A CN 201811319210 A CN201811319210 A CN 201811319210A CN 109371199 A CN109371199 A CN 109371199A
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- carbide
- heat resisting
- resisting steel
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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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- 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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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of methods for refining 21-4N heat resisting steel carbide, especially a kind of method for the refinement 21-4N heat resisting steel carbide for being related to metal material Field of Heat-treatment: the method for the refinement 21-4N heat resisting steel carbide of the application, including the following steps: A, 21-4N heat resisting steel are when ladle refining furnace refines, after molten steel temperature reaches target temperature, pass through the continuous feeding precision deoxidation of wire feeder；B, mouth is added and is added by alloy and contain magnesium alloy；C, it is kept the temperature after step B in ladle refining furnace, argon gas in insulating process；D, it is poured, and content of magnesium in ingot casting or continuous casting billet is made to reach 30ppm~200ppm.The method of refinement 21-4N heat resisting steel carbide of the invention can improve alloy comprehensive performance and eliminate alloy notch sensibility.One kind can reduce 21-4N heat resisting steel laminate carbide size, and can reduce the aggregation of carbide, and the corrosion resistance of steel is effectively avoided to decline, and reduce Post isothermal treatment burden.
Description
Technical field
The present invention relates to a kind of method for refining 21-4N heat resisting steel carbide, especially one kind is related at metal material heat
The method of the refinement 21-4N heat resisting steel carbide in reason field.
Background technique
21-4N heat resisting steel is to be used to manufacture the most wide material of the engine exhaust valves such as automobile and motorcycle at present both at home and abroad,
It is that enough elevated temperature strengths, tough are obtained as precipitation-hardening phase Dispersed precipitate using carbon, nitrogen compound using austenite as base
Property, higher hardness, good wearability and kept under the conditions of alternating hot and cold structure stability, obtain it is preferable anti-oxidant
And corrosion resistance, there is good mechanical property and high-temperature behavior at 800 DEG C of operating temperature.
21-4N heat resisting steel is high-alloy steel, and carbon and chromium content are very high in steel, is existed in smelting or the operation of rolling, in steel big
The M of amount23C6And M7C3Type carbide, and the size of carbide, pattern and distribution are to the service life of air valve and the stability of performance
With greatly influencing.During solidification of molten steel, M7C3Type carbide is prior to M23C6Type Carbide Precipitation, with the drop of temperature
Low and carbon chromium is constantly precipitated, M7C3Type carbide is gradually converted into M23C6Type carbide, since the diffusion of element needs centainly
Time, M7C3Type carbide cannot be completely transformed into M23C6Type carbide, therefore both contain a large amount of M in 21-4N steel23C6Type carbonization
Object includes a small amount of M again7C3Type carbide.M23C6Type carbide and M7C3Type carbide is all the carbide based on chromium, coarse
M23C6Type carbide and M7C3Type carbide will lead to chromium depleted around carbide, and the corrosion resistance of steel is caused to decline, furthermore coarse
Carbide will increase the burden of Post isothermal treatment, cause the unnecessary consumption of the energy, result even in carbide after heat treatment
Size cannot still be up to state standards requirement, increase rejection rate.
Summary of the invention
Technical problem to be solved by the invention is to provide one kind can reduce 21-4N heat resisting steel laminate carbide ruler
It is very little, and the aggregation of carbide can be reduced, it effectively avoids the corrosion resistance of steel from declining, reduces the refinement of Post isothermal treatment burden
The method of 21-4N heat resisting steel carbide.
The method that the present invention solves refinement 21-4N heat resisting steel carbide used by its technical problem, including it is following
Step:
A, 21-4N heat resisting steel after molten steel temperature reaches target temperature, is connected when ladle refining furnace is refined by wire feeder
Continuous feeding precision deoxidation；
B, mouth is added and is added by alloy and contain magnesium alloy；
C, it is kept the temperature after step B in ladle refining furnace, argon gas in insulating process；
D, it is poured, and content of magnesium in ingot casting or continuous casting billet is made to reach 30ppm~200ppm.
Further, continuously feeding aluminium by wire feeder in step C when molten steel temperature reaches 1550 DEG C~1650 DEG C
Silk deoxidation.
Further, mouth, which is added, by alloy in step B is added nickel magnesium alloy.
Further, the Magnesium-bearing Cored Wire Feeding in step B.
Further, the flow of argon gas is 30L/min~350L/min in step C.
Further, holding temperature will make to open and pour temperature within the scope of 1400 DEG C~1490 DEG C in step C.
The beneficial effects of the present invention are: application is closed by being added in 21-4N heat resisting steel when ladle refining furnace refines containing magnesium
Gold reduces carbide size in 21-4N heat resisting steel, and carbide is uniformly distributed in steel；Make in steel in this way containing certain
The magnesium of content, not only influences the pick-up behavior of the heat-resisting steel inclusion of 21-4N and carbide, while can also refine to solidified structure
Generate advantageous effect, thus improve the elevated temperature strength and wear resistance at elevated temperature of 21-4N heat resisting steel, furthermore the magnesium in steel and oxygen and
Sulphur has very strong affinity, forms magnesia and magnesium sulfide, improves the degree of purity of steel.
Detailed description of the invention
Fig. 1 is free from the carbide photomicrograph of magnesium steel.
Fig. 2 is the carbide photomicrograph of the steel of 32ppm containing magnesium.
Fig. 3 is free from magnesium steel carbide grain size distribution.
Fig. 4 is the carbide grain size distribution of the steel of 32ppm containing magnesium.
Specific embodiment
The following further describes the present invention with reference to the drawings.
The method that the present invention solves refinement 21-4N heat resisting steel carbide used by its technical problem includes following step
It is rapid:
A, 21-4N heat resisting steel after molten steel temperature reaches target temperature, is connected when ladle refining furnace is refined by wire feeder
Continuous feeding precision deoxidation；
B, mouth is added and is added by alloy and contain magnesium alloy；
C, it is kept the temperature after step B in ladle refining furnace, blowing argon gas in insulating process；
D, it is poured, and content of magnesium in ingot casting or continuous casting billet is made to reach 30ppm~200ppm.
The application is heat-resisting to reduce 21-4N containing magnesium alloy by being added in 21-4N heat resisting steel when ladle refining furnace refines
Carbide size in steel, and carbide is uniformly distributed in steel；Make the magnesium for containing certain content in steel in this way, not only influences
The pick-up behavior of the heat-resisting steel inclusion of 21-4N and carbide, while solidified structure can also be refined and generate advantageous effect, by
This improves the elevated temperature strength and wear resistance at elevated temperature of 21-4N heat resisting steel, and furthermore the magnesium in steel and oxygen and sulphur have very strong affinity,
Magnesia and magnesium sulfide are formed, the degree of purity of steel is improved.In insulating process Argon can uniformly heat resisting steel temperature and ingredient.
In step C when molten steel temperature reaches 1550 DEG C~1650 DEG C, pass through the continuous feeding precision deoxidation of wire feeder.?
It can be fast after in 1550 DEG C~1650 DEG C temperature ranges by way of the continuous feeding precision of wire feeder nickel magnesium alloy can be added
Speed is melted, and obtains higher nickel, magnesium recovery rate, and guarantees the pouring temperature that can achieve steel after nickel magnesium alloy is added.
The application is added there are two types of the modes containing U.S. alloy, the first is mouth to be added by alloy nickel magnesium alloy, nickel is added
Magnesium alloy block can be sunk in molten steel under the effect of gravity with fast speed, to guarantee the recovery rate of magnesium.
The application can also be by the way of Magnesium-bearing Cored Wire Feeding, the online core of magnesium, after feeding in molten steel, outer protection
Magnesium could melt after melting layer, without just evaporating magnesium after being added in molten steel.
The flow of argon gas is 30L/min~350L/min in step C.Gas can make to keep the temperature using aforementioned argon flow
The temperature and component distributing of heat resisting steel are more uniform in journey.
Holding temperature, which will make to open, in step C pours temperature within the scope of 1400 DEG C~1490 DEG C.Make after protecting in this way
Molten steel can carry out under conditions of meeting pouring temperature.
Embodiment 1
21-4N heat resisting steel is when LF furnace refines (molten steel about 80t in ladle), when molten steel temperature reaches 1600 DEG C of target temperature
Afterwards, by the continuous feeding precision deoxidation of wire feeder, mouth is added by alloy, nickel magnesium alloy (or Magnesium-bearing Cored Wire Feeding) is added, alloying
After 300 meters of Ca Si wire feeding, 5min are kept the temperature in 1520 DEG C of LF furnaces, with 100L/min flow Argon with uniform in insulating process
Temperature and ingredient, are opened and pour temperature content of magnesium 72ppm in 1445 DEG C, ingot casting (or continuous casting billet) by 1500 DEG C of bull ladle temperature.
In the present embodiment, carbide is obviously refined, and layer structure is thinning, and carbide is uniformly distributed, and massive carbide is basic
It disappears.Oxygen sulfur content in ingot casting reduces by 22% and 30% respectively.Inclusion content reduces 15%, and size significantly reduces, shape
Become spherical shape.
Embodiment 2
21-4N heat resisting steel is when LF furnace refines (molten steel about 75t in ladle), when molten steel temperature reaches 1600 DEG C of target temperature
Afterwards, by the continuous feeding precision deoxidation of wire feeder, mouth is added by alloy, nickel magnesium alloy (or Magnesium-bearing Cored Wire Feeding) is added, alloying
After 300 meters of Ca Si wire feeding, 5min are kept the temperature in 1520 DEG C of LF furnaces, with 90L/min flow Argon with uniformly temperature in insulating process
Degree and ingredient, open and pour temperature content of magnesium 32ppm in 1450 DEG C, ingot casting (or continuous casting billet) by 1500 DEG C of bull ladle temperature.
In the present embodiment, carbide is obviously refined, and layer structure is thinning, and carbide is uniformly distributed, and massive carbide is basic
It disappears.Oxygen sulfur content in ingot casting reduces by 18% and 25% respectively.Inclusion content reduces 10%, and size significantly reduces, shape
Become spherical shape.
Embodiment 3
21-4N heat resisting steel is when LF furnace refines (molten steel about 65t in ladle), when molten steel temperature reaches 1600 DEG C of target temperature
Afterwards, by the continuous feeding precision deoxidation of wire feeder, mouth is added by alloy, nickel magnesium alloy (or Magnesium-bearing Cored Wire Feeding) is added, alloying
After 300 meters of Ca Si wire feeding, 5min are kept the temperature in 1520 DEG C of LF furnaces, with 80L/min flow Argon with uniformly temperature in insulating process
Degree and ingredient, open and pour temperature content of magnesium 57ppm in 1440 DEG C, ingot casting (or continuous casting billet) by 1500 DEG C of bull ladle temperature.
In the present embodiment, carbide is obviously refined, and layer structure is thinning, and carbide is uniformly distributed, and massive carbide is basic
It disappears.Oxygen sulfur content in ingot casting reduces by 20% and 27% respectively.Inclusion content reduces 13%, and size significantly reduces, shape
Become spherical shape.
In order to more fully illustrate effect of the invention, related description is carried out with actual test data now:
It takes above-described embodiment 2 plus magnesium 32ppm ingot casting and the metallographic phase sample of magnesium ingot casting is not added.Its ingredient is as shown in table 1.
Table 1 plus magnesium 32ppm and ingredient/% that magnesium 21-4N steel is not added
20s is corroded using saturation picric acid hydrochloride alcohol mixed solution to after metallographic sample polishing.After metallographic phase sample corrosion
Morphology of carbides is as depicted in figs. 1 and 2, it can be seen that carbide layer structure attenuates after magnesium is added in steel, and block structure is basic
It disappears.It is rolled to without magnesium steel and steel containing magnesium using same process, is respectively counted in the case where metallographic microscope amplifies 1000 times
The size of at least 330 carbide, Fig. 3 and Fig. 4 are statistical result, from fig. 4, it can be seen that carbide is straight in 0.0032%Mg steel
Diameter even size distribution degree is preferable, and the carbide proportion that 0.5 μm~1.5 μm of diameter reaches 78.95%.Furthermore with regard to larger carbide
Proportion (b) 2.5 μm~4.5 μm: 0.91%, adds large particle carbide after Mg aobvious 3 μm~4.5 μm: 2.56% in Fig. 3
It writes and reduces.
Claims (6)
1. the method for refining 21-4N heat resisting steel carbide, it is characterised in that: including the following steps:
A, 21-4N heat resisting steel is when ladle refining furnace refines, and after molten steel temperature reaches target temperature, is continuously fed by wire feeder
Aluminium wire deoxidation；
B, mouth is added and is added by alloy and contain magnesium alloy；
C, it is kept the temperature after step B in ladle refining furnace, blows suitable argon gas in insulating process；
D, it is poured, and content of magnesium in ingot casting or continuous casting billet is made to reach 30ppm~200ppm.
2. the method for refinement 21-4N heat resisting steel carbide as described in claim 1, it is characterised in that: work as molten steel in step C
When temperature reaches 1550 DEG C~1650 DEG C, pass through the continuous feeding precision deoxidation of wire feeder.
3. the method for refinement 21-4N heat resisting steel carbide as described in claim 1, it is characterised in that: pass through conjunction in step B
Gold is added mouth and nickel magnesium alloy is added.
4. the method for refinement 21-4N heat resisting steel carbide as described in claim 1, it is characterised in that: fed in step B and contain magnesium
Core-spun yarn.
5. the method for refinement 21-4N heat resisting steel carbide as described in claim 1, it is characterised in that: the argon gas in step C
Flow is 30L/min~350L/min.
6. the method for refinement 21-4N heat resisting steel carbide as described in claim 1, it is characterised in that: keep the temperature temperature in step C
Degree, which will make to open, pours temperature within the scope of 1400 DEG C~1490 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811319210.1A CN109371199A (en) | 2018-11-07 | 2018-11-07 | The method for refining 21-4N heat resisting steel carbide |
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| CN201811319210.1A CN109371199A (en) | 2018-11-07 | 2018-11-07 | The method for refining 21-4N heat resisting steel carbide |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113088625A (en) * | 2021-03-11 | 2021-07-09 | 上大新材料(泰州)研究院有限公司 | Method for modifying austenitic heat-resistant steel carbide |
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| CN103667587A (en) * | 2012-09-24 | 2014-03-26 | 江苏申源特钢有限公司 | Smelting method of austenite steel for engine air valve |
| US20140224446A1 (en) * | 2013-01-22 | 2014-08-14 | Ningxia Orient Tantalum Industry Co., Ltd. | Base material for high temperature alloy and manufacture method thereof |
| CN105543713A (en) * | 2016-01-19 | 2016-05-04 | 重庆材料研究院有限公司 | Micro-alloyed high-strength anti-oxidization iron-nickel alloy gas valve steel material and preparation method |
| CN105839028A (en) * | 2015-01-12 | 2016-08-10 | 宝钢特钢有限公司 | Austenite heat-resistant valve steel and manufacturing method thereof |
-
2018
- 2018-11-07 CN CN201811319210.1A patent/CN109371199A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103667587A (en) * | 2012-09-24 | 2014-03-26 | 江苏申源特钢有限公司 | Smelting method of austenite steel for engine air valve |
| US20140224446A1 (en) * | 2013-01-22 | 2014-08-14 | Ningxia Orient Tantalum Industry Co., Ltd. | Base material for high temperature alloy and manufacture method thereof |
| CN105839028A (en) * | 2015-01-12 | 2016-08-10 | 宝钢特钢有限公司 | Austenite heat-resistant valve steel and manufacturing method thereof |
| CN105543713A (en) * | 2016-01-19 | 2016-05-04 | 重庆材料研究院有限公司 | Micro-alloyed high-strength anti-oxidization iron-nickel alloy gas valve steel material and preparation method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113088625A (en) * | 2021-03-11 | 2021-07-09 | 上大新材料(泰州)研究院有限公司 | Method for modifying austenitic heat-resistant steel carbide |
| CN113088625B (en) * | 2021-03-11 | 2022-06-21 | 上大新材料(泰州)研究院有限公司 | Method for modifying austenitic heat-resistant steel carbide |
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Application publication date: 20190222 |
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