CN106756479A - High cleanliness flat cold-rolled sheet austenitic stainless steel and its production method - Google Patents
High cleanliness flat cold-rolled sheet austenitic stainless steel and its production method Download PDFInfo
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- CN106756479A CN106756479A CN201611119996.3A CN201611119996A CN106756479A CN 106756479 A CN106756479 A CN 106756479A CN 201611119996 A CN201611119996 A CN 201611119996A CN 106756479 A CN106756479 A CN 106756479A
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C21C7/0006—Adding metallic additives
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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
- 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
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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Abstract
The invention discloses a kind of high cleanliness flat cold-rolled sheet austenitic stainless steel and its production method, belong to a kind of stainless steel smelting method, described austenitic stainless steel includes：0.03%~0.06% C, 0.3%~0.6% Si, 1.0%~1.3% Mn, 18.00%~18.50% Cr, 8.00%~8.20% Ni, 0.025%~0.050% N, 0~0.5% Cu, 0~0.045% P, 0~0.0080% S, balance of Fe and inevitable impurity；By carrying out composition design to stainless steel, tundish metallurgy operations are performed, improve continuous casting production metallurgy ability, field trash residual has been contained from source；Whole process is because of effective containment, the removal to molten steel inclusion, improve Molten Steel Cleanliness, improve inside steel billet quality, reduce the surface defect problem occurred in stainless steel hot-rolling, cold rolling process so that the flat cold-rolled sheet quality of downstream production can be applied to produce more high-grade, precision and advanced stainless steel product.
Description
Technical field
It is in particular, cold the invention mainly relates to a kind of high cleanliness the present invention relates to a kind of stainless steel smelting method
Roll thin plate austenitic stainless steel and its production method.
Background technology
Past four, five during the decade, global stainless steel output is increased with average more than 5% growth rate always.In hair
Also martensitic stain less steel has been gradually formed during exhibition（Including precipitation-hardening stainless steel）, ferritic stainless steel, austenite stainless
Steel and two-phase（Austenite+ferrite）It is 304 austenitic stainless steels, 304 that the major class of stainless steel etc. four, wherein purposes are most commonly used
Austenitic stainless steel has good corrosion resistance, resistant of high or low temperature, high intensity, exquisite appearance, while taking into account excellent mechanical property
Energy and processing performance, are widely used in petrochemical industry, atomic energy, space flight and aviation, the energy, traffic, light industry, weaving, residential hardware
Deng each industrial department, it is these field construction and develops indispensable important materials.While stainless steel high speed development,
The application popularization of the stainless steel materials such as various 304 steel grade BA plates, accurate band, 8K mirror boards is proposed more to the degree of purity of stainless steel
Requirement high.
304 comparative maturities of production in current industry, the flat cold-rolled sheet of high cleanliness 304 is the product being most received by the market, but
Most of to be used because pure interior is produced to cold rolling cut deal the reason for spending, production to flat cold-rolled sheet has higher proportion
Plate face peeling defect（Inner non-metallic field trash is caused）, it is difficult to reach use requirement.Field trash can be divided into interior life by its source
Be mingled with two kinds of foreing impuritys, as smelting technique constantly improves, the degree of purity of molten steel is significantly improved, the amount of inclusions in steel
Gradually decrease.The method for proposing more effective control inclusion content in melting steel both at home and abroad at present, the addition of such as control calcium is improved
Degree of purity and high-precision quantitative analysis CaO systems field trash of molten steel etc., but above-mentioned measure is to greatest extent in removal molten steel
Field trash, does not reduce being involved in for non-metallic inclusions in molten steel from source, it is impossible to fundamentally reduce the generation of downstream defects
Rate, and optimization composition design can greatly promote tolerance of the austenitic stainless steel steel grade to impurity, also temporarily refer to, thus
It is necessary further to be studied and improved for this kind of stainless steel and its smelting process.
The content of the invention
An object of the present invention is for above-mentioned deficiency, there is provided a kind of high cleanliness flat cold-rolled sheet austenite stainless
Steel and its production method, to expect to solve flat cold-rolled sheet easily plate face peeling defect, nothing caused by nonmetallic inclusion in the prior art
Method reduces being involved in for non-metallic inclusions in molten steel from source, it is impossible to fundamentally reduces the technologies such as the incidence of downstream defects and asks
Topic.
To solve above-mentioned technical problem, the present invention uses following technical scheme：
One aspect of the present invention provides a kind of high cleanliness flat cold-rolled sheet austenitic stainless steel, described austenite stainless ladle
Include：0.03%~0.06% C, 0.3%~0.6% Si, 1.0%~1.3% Mn, 18.00%~18.50% Cr,
8.00%~8.20% Ni, 0.025%~0.050% N, 0~0.5% Cu, 0~0.045% P, 0~0.0080%
S, balance of Fe and inevitable impurity；The Dg values of described austenitic stainless steel are 6.0%~8.0%, Md30 values
It is -20 DEG C~20 DEG C.
Preferably, further technical scheme is：Described Dg values are its delta ferrite phase after austenitic stainless steel solidification
Residual quantity percentage, drawn by following formula：
；
Described Md30 values be austenitic stainless steel when 30% stretcher strain is carried out, wherein have 50% structural transformation be martensite
When temperature, drawn by following formula：
。
Another aspect of the present invention provides a kind of production method of high cleanliness flat cold-rolled sheet austenitic stainless steel, described
Method include：
Step A, molten steel C, Si content when electric arc furnaces, mineral hot furnace are tapped is improved, created to AOD refining furnaces and good open the condition of blowing；
The change steel temperature of AOD refining furnaces is 1500~1550 DEG C.
Step B, in AOD refining furnace reduction periods, ferrosilicon, fluorite input are stirred after terminating, it is ensured that reduction Si ＞
0.3%, the total O ＜ 0.005% of molten steel, reduction S ＜ 0.008%, alloy total amount ＜ 500Kg, refining time >=5min are added in refining；
The quantity of slag is controlled more than 2 tons after step C, reduction are skimmed, basicity CaO/SiO2=1.8 ~ 2.0%, confirm that slag is good；Tapping
1600 DEG C of temperature ＞, during tapping, preceding 1/3 goes out rear quick tapping slowly, the input carbonization rice husk reduction naked leakage of molten steel in time；
Step D, molten steel carry out power transmission operation to LF stoves according to liquid steel temperature, molten steel temperature is reached more than 1500 DEG C, and intensity
Stirring more than 5min, it is ensured that liquid steel temperature is uniform；Sampling analysis, when S contents<When 0.0030%, addition 50Kg modification agent adjustment
Top basicity of slag；
Step E, according to composition internal control specification, fine setting molten steel composition simultaneously makes Dg values, Md30 values reach target zone；Feeding calcium silicon line
110M, prevents slag from hardening, and carry out soft stirring 14~16min, 10~25min of calmness while putting into carbonization rice husk；
Step F, LF stoves station simultaneously management and control alloy add total amount<300kg, tapping temperature at 1510~1525 DEG C, with guarantee
Bag temperature, confirms that composition is qualified on molten steel before turntable；
Step G, pulling speed of continuous casting ensure that 1.25 ~ 1.4m/min is constant, pulling rate fluctuation<0.05m/min；Handing-over stove carries out bale slag-blanking
Automatic monitoring, closes big bag in advance, and every 8 furnace slag discharge is once；
Step H, casting overall process use non-oxidation protective casting, it is ensured that ladle is opened certainly, it is ensured that long nozzle argon envelope, submersed nozzle
Argon gas is normal between filling pipe end plate, and middle Baogang's liquid is covered using coverture, so as to realize in casting cycle isolating with air.
Preferably, further technical scheme is：In the step A, as the C ＞ 2.5% in molten steel, by AOD essences
The change steel temperature control of furnace, as C ＜ 2.5%, the change steel temperature control of AOD refining furnaces is existed in the value close to lower limit
Close to the value of higher limit.
Further technical scheme is：In the step B, ferrosilicon, fluorite input terminate in AOD refining furnace reduction periods
Mixing time afterwards is more than 8min.
Further technical scheme is：It is appropriate high in the step F, it is ensured that tundish temperature is 1485~1500 DEG C
The degree of superheat is conducive to improving molten steel flow, and inclusion floating kinetic energy is big.
Further technical scheme is：In the step G, every 8 furnace slag discharge once, accelerates big bag and subcontracts rhythm, it is ensured that
Bag tonnage in handing-over stove, and then enable the field trash that more than 75% middle bag liquid level effectively removed in molten steel.
Further technical scheme is：In the step E, Dg values are its delta ferrite phase after austenitic stainless steel solidification
Residual quantity percentage, drawn by following formula：
；
Md30 values be austenitic stainless steel when 30% stretcher strain is carried out, wherein have 50% structural transformation be martensite when temperature
Degree, is drawn by following formula：
。
Compared with prior art, the beneficial effects of the invention are as follows predominantly：
1st, rationally controlled by DG values and Md30 values, coordinated hot rolling technique, reduced slab inside and top layer crackle
Generation, significantly reduce the appearance of coil of strip hot-working, cold working surface and edge cracks, improve product quality, improve
Yield rate；
2nd, the reduction of AOD refining furnaces is enhanced, the oxygen content in molten steel is reduced；The big stirring of LF stove Argons, sufficient soft blow calmness time
And silicon-calcium wire is added in right amount, promote inclusion floating or modified；The whole non-oxidation molding casting of cast, it is to avoid molten steel it is secondary
Oxidation；
3rd, by carrying out composition design to stainless steel, tundish metallurgy operations are performed, improve continuous casting production metallurgy ability,
Field trash residual is contained from source；Whole process improves molten steel pure because of effective containment, removal to molten steel inclusion
Degree, improves inside steel billet quality, reduces the surface defect problem occurred in stainless steel hot-rolling, cold rolling process so that under
The flat cold-rolled sheet quality for swimming production can be applied to produce more high-grade, precision and advanced stainless steel product.
Brief description of the drawings
Fig. 1 is the process flow diagram for illustrating one embodiment of the invention；
Fig. 2 is the field trash statistical chart for illustrating austenitic stainless steel in implementation result of the present invention.
Specific embodiment
The present invention is further elaborated below in conjunction with the accompanying drawings.
In the element proportioning of austenitic stainless steel of the present invention：
C is a kind of interstitial element, and the intensity of steel is remarkably improved by solution strengthening, is formed and stable austenite and expansion Ovshinsky
Body area, but the C and Cr in steel combines to form Cr under certain condition23C6Type carbide, makes the corrosion resistance of steel be particularly resistance to intergranular
Corrosive nature declines, therefore C should be controlled in 0.03~0.06%.
Si is a kind of reducing agent and deoxidier, and silicon can significantly improve the elastic limit of steel, yield point and tensile strength, but silicon
Amount increases, and can reduce the welding performance of steel, therefore, Si is defined as between 0.3~0.6%.
Mn is the element of strong stable austenite, and suitable Mn/S ratios can be greatly reduced the thick chain oxygen of steel grade S generations
The possibility of compound, improves the intensity of steel and improves the thermoplasticity of steel, but the Mn of excess reduces formability and weldability, because
This, Mn is defined as between 1.0~1.3%.
Cr is the formation element of ferritic phase, the performance of steel oxidative resistance medium and pickling chloride media is improved, to carry
Steel grade DG values high suitably increase Cr contents, therefore, Cr is defined as 18.0 ~ 18.5%.
Ni is the strong element for forming simultaneously stable austenite and expansion austenite phase field, with the increase of nickel content, steel
Intensity decreases and plasticity are improved, and are conducive to cold machine-shaping performance, therefore, Ni is defined as 8.0 ~ 8.20%.
O is the element being harmful in molten steel, and oxidation generation Al is easily carried out with aluminium, magnesium2O3, the compound such as MgO, in steel-making, even
Molten steel is involved in during casting, molten steel degree degree of purity is influenceed, therefore, O is defined as less than 0.005%.
N improves the intensity of austenitic stainless steel as solution strengthening element, it is also possible to improve the decay resistance of steel, but N
Heat, cold-workability and the cold formability of stainless steel can be reduced after content is higher, the target of Dg values 6.0%~8.0% is taken into account, because
This, N is defined as 0.025%~0.050%.
Embodiment 1
A kind of austenitic stainless steel is present embodiments provided, its chemical component weight per distribution ratio is：The content of C is 0.037%；
The content of Si is 0.46%；The content of Mn is 1.07%；The content of Cr is 18.25%；The content of Ni is 8.06%；The content of N
It is 0.0434%；The content of P is 0.026%；The content of S is 0.035% for the content of 0.0035%, Cu, and remaining is for Fe and not
Evitable impurity element；The Dg values of composition calculating are pressed for 7.81%, Md30 values are 15.92 DEG C.
Above-mentioned Dg values are the residual quantity percentage of its delta ferrite phase after austenitic stainless steel solidification, can be calculated by following formula
Draw：
；
Above-mentioned Md30 values be austenitic stainless steel when 30% stretcher strain is carried out, wherein have 50% structural transformation be martensite
When temperature, can be calculated by following formula：
。
With reference to shown in Fig. 1, the element proportioning based on above-mentioned high austenite stainless steel, the present embodiment is preferably according to following step
Suddenly production operation is carried out, i.e., a kind of production method of high cleanliness flat cold-rolled sheet austenitic stainless steel：
Step 1, mineral hot furnace tap carbon content in 3.001%, silicone content 0.671%, 1550 DEG C of tapping temperature；
Step 2, carbon, silicone content are enough, 1511 DEG C of AOD refining furnace steel temperature；
Step 3, AOD refining furnace reduction periods ferrosilicon, fluorite input are stirred 8 minutes after terminating, and reduce Si=0.35%, S=
0.004%, alloy total amount 210Kg is added in refining, and refining time was at 6 minutes；
The quantity of slag is controlled in 2.1 tons, basicity CaO/SiO2=1.98%, 1620 DEG C of tapping temperature, carbonization rice after step 4, reduction are skimmed
Shell input 8 is wrapped；
To 1580 DEG C of LF stoves station temperature, intensity is stirred 6 minutes, it is ensured that liquid steel temperature is uniform for step 5, molten steel；Sampling analysis, S contains
Amount 0.0034%, without adding modification agent；
After step 6, temperature are suitable, according to composition internal control specification, molten steel composition, Dg=7.91%, Md30 value=16.12 DEG C are finely tuned；
110 meters of feeding calcium silicon line, carbonization rice husk 4 is wrapped, and carry out it is soft stir 15 minutes, it is calm 15 minutes；
Step 7, LF stoves station alloy add total amount 110kg, and at 1525 DEG C, tundish temperature turns tapping temperature at 1495 DEG C on molten steel
Composition is qualified before platform；
Step 8, big bag are from opening, and pulling speed of continuous casting 1.35m/min is constant, pulling rate fluctuation<0.05m/min；Handing-over stove is carried out under big bag
Slag is monitored, and big bag is closed in advance, and 4.3 tons of Bao Neiliu slags, every 8 furnace slag discharge once, joins 22.7 tons of bag tonnage in stove；
Step 9, casting overall process use non-oxidation protective casting, ladle to open certainly, long nozzle argon envelope, submersed nozzle and filling pipe end
Argon gas is normal between plate, input 2 covering agents covering is wrapped in handing-over stove, so as to realize isolating in casting cycle with air.
, even to pour the 10th stove, continuous casting is cast total several 35 stoves of stove for step 10, the stove, and the cold rolling feedback in downstream because of field trash without dropping
Level.
In the present embodiment, by the process control and centering to emphasis link in stainless steel composition design, smelting process
Between wrap and undergo technological transformation, the residual of non-metallic inclusion is checked from source, lift the cleanliness factor of molten steel, improve inside steel billet
Quality, reduces the surface defect problem occurred in stainless steel hot-rolling, cold rolling process so that the flat cold-rolled sheet product of downstream production
Matter can be applied to produce more high-grade, precision and advanced stainless steel product.
Embodiment 2
The present embodiment still provides a kind of austenitic stainless steel, and its chemical component weight per distribution ratio is：The content of C is
0.046%；The content of Si is 0.40%；The content of Mn is 1.05%；The content of Cr is 18.19%；The content of Ni is
8.026%；The content of N is 0.0487%；The content of P is 0.033%；The content of S is that the content of 0.0040%, Cu is
0.026%, remaining is Fe and inevitable impurity element, and the Dg values calculated by composition are that 6.26%, Md30 values are 12.14
℃.Wherein Dg values are identical with the above embodiments with the calculation of Md30 values.
Referring still to shown in Fig. 1, the element based on above-mentioned high austenite stainless steel is matched, and the present embodiment is preferably according to such as
Lower step carries out production operation, i.e., a kind of production method of high cleanliness flat cold-rolled sheet austenitic stainless steel：
Step 1, mineral hot furnace tap carbon content in 2.54%, silicone content 0.451%, 1510 DEG C of tapping temperature；
Step 2, carbon, silicone content are slightly relatively low, 1545 DEG C of the change steel temperature of AOD refining furnaces；
Step 3, AOD refining furnace reduction periods ferrosilicon, fluorite input are stirred 9 minutes after terminating, and reduce Si=0.41%, S=
0.005%, alloy total amount 320Kg is added in refining, and refining time was at 7 minutes；
The quantity of slag is controlled in 2.3 tons, basicity CaO/SiO after step 4, reduction are skimmed2=1.90%, 1604 DEG C of tapping temperature, be carbonized rice
Shell input 7 is wrapped；
, to 1560 DEG C of LF stoves station temperature, intensity is stirred 5 minutes after intensification, it is ensured that liquid steel temperature is uniform for step 5, molten steel；Sampling point
Analysis, S contents 0.0041%, without adding modification agent；
After step 6, temperature are suitable, according to composition internal control specification, molten steel composition is finely tuned, Dg values 6.51%, Md30 values are 13.05
℃；110 meters of feeding calcium silicon line, carbonization rice husk 4 is wrapped, and carry out it is soft stir 14 minutes, it is calm 17 minutes；
Step 7, LF stoves station alloy add total amount 70kg, tapping temperature at 1522 DEG C, tundish temperature at 1489 DEG C, turntable on molten steel
Preceding composition is qualified；
Step 8, big bag are from opening, and pulling speed of continuous casting 1.30m/min is constant, pulling rate fluctuation ＜ 0.05m/min；Handing-over stove is carried out under big bag
Slag is monitored, and big bag is closed in advance, and 3.9 tons of Bao Neiliu slags, every 8 furnace slag discharge once, joins 23.1 tons of bag tonnage in stove；
Step 9, casting overall process use non-oxidation protective casting, ladle to open certainly, long nozzle argon envelope, submersed nozzle and filling pipe end
Argon gas is normal between plate, input 1 covering agent covering is wrapped in handing-over stove, so as to realize isolating in casting cycle with air.
, even to pour the 21st stove, continuous casting is cast total several 40 stoves of stove for step 10, the stove, and the cold rolling feedback in downstream because of field trash without dropping
Level.
Embodiment 3
The present embodiment or a kind of austenitic stainless steel, its chemical component weight per distribution ratio is：The content of C is 0.051%；Si
Content be 0.428%；The content of Mn is 1.06%；The content of Cr is 18.29%；The content of Ni is 8.044%；The content of N
It is 0.0426%；The content of P is 0.035%；The content of S is 0.124% for the content of 0.0051%, Cu, and remaining is for Fe and not
Evitable impurity element, the Dg values calculated by composition are that 6.83, Md30 values are 7.12 DEG C.
Also with reference to shown in Fig. 1, the element based on above-mentioned high austenite stainless steel is matched, and the present embodiment is preferably according to such as
Lower step carries out production operation, i.e., a kind of production method of high cleanliness flat cold-rolled sheet austenitic stainless steel：
Step 1, mineral hot furnace tap carbon content in 2.871%, silicone content 0.359%, 1590 DEG C of tapping temperature；
Step 2, carbon, silicone content are enough, 1530 DEG C of the change steel temperature of AOD refining furnaces；
Step 3, AOD refining furnace reduction periods ferrosilicon, fluorite input are stirred 8 minutes after terminating, and reduce Si=0.39%, S=
0.0048%, alloy total amount 340Kg is added in refining, and refining time was at 6 minutes；
The quantity of slag is controlled in 2.5 tons, basicity CaO/SiO after step 4, reduction are skimmed2=1.87%, 1595 DEG C of tapping temperature, be carbonized rice
Shell input 6 is wrapped；
, to 1540 DEG C of LF stoves station temperature, intensity is stirred 5 minutes after feeding temperature-raising, it is ensured that liquid steel temperature is uniform for step 5, molten steel；Take
Sample is analyzed, S contents 0.0050%, without adding modification agent；
After step 6, temperature are suitable, according to composition internal control specification, molten steel composition, Dg=7.03, Md30 value=8.25 DEG C are finely tuned；Feeding
110 meters of calcium silicon line, carbonization rice husk 4 is wrapped, and carry out it is soft stir 16 minutes, calm 20 minutes；
Step 7, LF stoves station alloy add total amount 90kg, tapping temperature at 1519 DEG C, tundish temperature at 1493 DEG C, turntable on molten steel
Preceding composition is qualified；
Step 8, big bag are from opening, and pulling speed of continuous casting 1.30m/min is constant, pulling rate fluctuation<0.05m/min；Handing-over stove is carried out under big bag
Slag is monitored, and big bag is closed in advance, and 4.7 tons of Bao Neiliu slags, every 8 furnace slag discharge once, joins 22.9 tons of bag tonnage in stove；
Step 9, casting overall process use non-oxidation protective casting, ladle to open certainly, long nozzle argon envelope, submersed nozzle and filling pipe end
Argon gas is normal between plate, input 2 covering agents covering is wrapped in handing-over stove, so as to realize isolating in casting cycle with air.
, even to pour the 34th stove, continuous casting is cast total several 42 stoves of stove for step 10, the stove, and the cold rolling feedback in downstream because of field trash without dropping
Level.
The other embodiments conducted in process of the test are to composition design, steel-making, continuous casting by above-mentioned and inventor
And other process control of the above carry out strict management and control, successive optimization is smelted and tundish metallurgy environment, in January, 2016~March
Applicant is cold rolling because field trash degradation ratio has been reduced within 1% in production, 4~stablize within 0.5% by the end of June, normally
Base without occurring because field trash degrades, joins base because field trash degradation ratio has been stablized within 0.5%, accompanying drawing 1 is referred to, in figure
In 1, abscissa is temperature value, and ordinate is the percentages of overall, normal base and handing-over base；It follows that of the invention
The smelting process for being provided can check the residual of non-metallic inclusions in molten steel in austenitic stainless steel production process from source
Stay, lift the degree of purity of molten steel.
Than that described above, in addition it is also necessary to which explanation is " one embodiment ", " another implementation spoken of in this manual
Example ", " embodiment " etc., specific features, structure or the feature for referring to being described with reference to the embodiment are included in the application summary
Property description at least one embodiment in.It is not necessarily to refer to same reality that statement of the same race occur in multiple places in the description
Apply example.Furthermore, it is understood that when describing specific features, structure or a feature with reference to any embodiment, what is advocated is knot
Other embodiment is closed also to fall within the scope of the present invention realizing this feature, structure or feature.
Although reference be made herein to invention has been described for multiple explanatory embodiments of the invention, however, it is to be understood that
Those skilled in the art can be designed that a lot of other modification and implementation methods, and these modifications and implementation method will fall in this Shen
Please be within disclosed spirit and spirit.More specifically, in the range of disclosure, drawings and claims, can
Various variations and modifications are carried out with the building block to theme composite configuration and/or layout.Except to building block and/or layout
Outside the variations and modifications for carrying out, to those skilled in the art, other purposes also will be apparent.
Claims (8)
1. a kind of high cleanliness flat cold-rolled sheet austenitic stainless steel, it is characterised in that described austenitic stainless steel includes：
0.03%~0.06% C, 0.3%~0.6% Si, 1.0%~1.3% Mn, 18.00%~18.50% Cr,
8.00%~8.20% Ni, 0.025%~0.050% N, 0~0.5% Cu, 0~0.045% P, 0~0.0080%
S, balance of Fe and inevitable impurity；The Dg values of described austenitic stainless steel are 6.0%~8.0%, Md30 values
It is -20 DEG C~20 DEG C.
2. high cleanliness flat cold-rolled sheet austenitic stainless steel according to claim 1, it is characterised in that：Described Dg values
It is the residual quantity percentage of its delta ferrite phase after austenitic stainless steel solidification, is drawn by following formula：
；
Described Md30 values be austenitic stainless steel when 30% stretcher strain is carried out, wherein have 50% structural transformation be martensite
When temperature, drawn by following formula：
。
3. a kind of production method of high cleanliness flat cold-rolled sheet austenitic stainless steel, it is characterised in that described method includes：
Step A, molten steel C, Si content when electric arc furnaces, mineral hot furnace are tapped is improved, created to AOD refining furnaces and good open the condition of blowing；
The change steel temperature of AOD refining furnaces is 1500~1550 DEG C.
Step B, in AOD refining furnace reduction periods, ferrosilicon, fluorite input are stirred after terminating, it is ensured that reduction Si ＞ 0.3%, steel
The total O ＜ 0.005% of liquid, reduction S ＜ 0.008%, alloy total amount ＜ 500Kg, refining time >=5min are added in refining；
The quantity of slag is controlled more than 2 tons after step C, reduction are skimmed, basicity CaO/SiO2=1.8% ~ 2.0%, confirm that slag is good；Tapping
1600 DEG C of temperature ＞, during tapping, preceding 1/3 goes out rear quick tapping slowly, the input carbonization rice husk reduction naked leakage of molten steel in time；
Step D, molten steel carry out power transmission operation to LF stoves according to liquid steel temperature, molten steel temperature is reached more than 1500 DEG C, and intensity
Stirring more than 5min, it is ensured that liquid steel temperature is uniform；Sampling analysis, when S contents<When 0.0030%, addition 50Kg modification agent adjustment top
Basicity of slag；
Step E, according to composition internal control specification, fine setting molten steel composition simultaneously makes Dg values, Md30 values reach target zone；Feeding calcium silicon line
110M, prevents slag from hardening, and carry out soft stirring 14~16min, 10~25min of calmness while putting into carbonization rice husk；
Step F, LF stoves station simultaneously management and control alloy add total amount<300kg, tapping temperature at 1510~1525 DEG C, with guarantee
Bag temperature, confirms that composition is qualified on molten steel before turntable；
Step G, pulling speed of continuous casting ensure that 1.25 ~ 1.4m/min is constant, pulling rate fluctuation<0.05m/min；Handing-over stove carries out bale slag-blanking
Automatic monitoring, closes big bag in advance, and every 8 furnace slag discharge is once；
Step H, casting overall process use non-oxidation protective casting, it is ensured that ladle is opened certainly, it is ensured that long nozzle argon envelope, submersed nozzle
Argon gas is normal between filling pipe end plate, and middle Baogang's liquid is covered using coverture, so as to realize in casting cycle isolating with air.
4. the production method of high cleanliness flat cold-rolled sheet austenitic stainless steel according to claim 3, it is characterised in that：
In the step A, as the C ＞ 2.5% in molten steel, AOD refining furnaces are changed into steel temperature control close to lower limit
Value, as C ＜ 2.5%, by the change steel temperature control of AOD refining furnaces in the value close to higher limit.
5. the production method of high cleanliness flat cold-rolled sheet austenitic stainless steel according to claim 3, it is characterised in that：
In the step B, ferrosilicon, fluorite put into the mixing time after terminating more than 8min in AOD refining furnace reduction periods.
6. the production method of the high cleanliness flat cold-rolled sheet austenitic stainless steel according to claim 3 to 4 any one,
It is characterized in that：In the step F, it is ensured that tundish temperature is 1485~1500 DEG C, the appropriate degree of superheat high is conducive to improving steel
Liquid mobility, inclusion floating kinetic energy is big.
7. the production method of the high cleanliness flat cold-rolled sheet austenitic stainless steel according to claim 3 to 4 any one,
It is characterized in that：In the step G, every 8 furnace slag discharge once, accelerates big bag and subcontracts rhythm, it is ensured that bag tonnage in handing-over stove, and then
Enable the field trash that more than 75% middle bag liquid level is effectively removed in molten steel.
8. the production method of high cleanliness flat cold-rolled sheet austenitic stainless steel according to claim 3, it is characterised in that：
In the step E, Dg values are the residual quantity percentage of its delta ferrite phase after austenitic stainless steel solidification, are drawn by following formula：
；
Md30 values be austenitic stainless steel when 30% stretcher strain is carried out, wherein have 50% structural transformation be martensite when temperature
Degree, is drawn by following formula：
。
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| CN117684080A (en) * | 2024-02-01 | 2024-03-12 | 浦项(张家港)不锈钢股份有限公司 | Cu 304-containing stainless steel surface band-shaped chromatic aberration improvement method |
| CN117684080B (en) * | 2024-02-01 | 2024-04-26 | 浦项(张家港)不锈钢股份有限公司 | Cu 304-containing stainless steel surface band-shaped chromatic aberration improvement method |
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