CN108277428A - Ultralow-carbon cold-rolled steel plate for gas nitrocarburizing and manufacturing method thereof - Google Patents
Ultralow-carbon cold-rolled steel plate for gas nitrocarburizing and manufacturing method thereof Download PDFInfo
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- CN108277428A CN108277428A CN201710005921.0A CN201710005921A CN108277428A CN 108277428 A CN108277428 A CN 108277428A CN 201710005921 A CN201710005921 A CN 201710005921A CN 108277428 A CN108277428 A CN 108277428A
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 25
- 239000010960 cold rolled steel Substances 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 51
- 239000010959 steel Substances 0.000 claims abstract description 51
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 17
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 13
- 239000012535 impurity Substances 0.000 claims abstract description 12
- 229910052802 copper Inorganic materials 0.000 claims abstract description 11
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 11
- 229910052742 iron Inorganic materials 0.000 claims abstract description 10
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 238000005096 rolling process Methods 0.000 claims description 12
- 238000005097 cold rolling Methods 0.000 claims description 11
- 238000003723 Smelting Methods 0.000 claims description 10
- 238000000137 annealing Methods 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 238000009749 continuous casting Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 235000013399 edible fruits Nutrition 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 229910001562 pearlite Inorganic materials 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 2
- 229910000859 α-Fe Inorganic materials 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 abstract description 15
- 238000005260 corrosion Methods 0.000 abstract description 15
- 238000005121 nitriding Methods 0.000 abstract description 13
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 230000036541 health Effects 0.000 abstract description 5
- 150000004767 nitrides Chemical class 0.000 abstract description 4
- 239000011573 trace mineral Substances 0.000 abstract description 2
- 235000013619 trace mineral Nutrition 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 15
- 239000011572 manganese Substances 0.000 description 13
- 239000010949 copper Substances 0.000 description 10
- 239000004411 aluminium Substances 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000004080 punching Methods 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 5
- 238000000465 moulding Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- -1 aluminum nitride compound Chemical class 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 210000000653 nervous system Anatomy 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 235000012054 meals Nutrition 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Classifications
-
- 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
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
-
- 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
-
- 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
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
An ultra-low carbon cold-rolled steel sheet for gas nitrocarburizing comprises the following chemical components in percentage by weight: 0.002 to 0.020 percent of C, 0.016 to 0.030 percent of Si, 0.08 to 0.16 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.012 percent of S, 0.030 to 0.30 percent of Al, 0.01 to 0.10 percent of Cu, and the balance of Fe and inevitable impurities. Compared with the prior art, the invention has the beneficial effects that: an ultra-low carbon cold-rolled steel sheet for gas nitrocarburizing and a manufacturing method thereof. The steel plate has excellent stamping and forming performances, and a formed workpiece can form a nitride film layer with a certain thickness, high hardness, compactness and excellent corrosion resistance on the surface of the steel plate through gas nitrocarburizing or gas nitriding. Meanwhile, impurities harmful to health are removed from the steel plate, and trace elements beneficial to health are added, so that the method is particularly suitable for manufacturing iron cookers.
Description
Technical field
The present invention relates to Ferrous Metallurgy, pressure processing and heat treatment more particularly to a kind of gas nitrocarburizing Ultra-low carbons
Cold-rolled steel sheet and its manufacturing method.
Background technology
Ultralow carbon cold-rolled steel plate has the characteristics that the low ductility of hardness is excellent, is widely used in various need to stamp into
The field of type, especially ultra-deep punching.In recent years, with the improvement of living standards, people are to traditional iron pan and existing do not glue
Pot etc., which is cooked a meal, is provided with higher requirement, and traditional iron pan is not glued because inevitably containing the harmful elements such as Mn, Pb in smelting process
The teflon coatings of pot are recognized due to potential carcinogenic risk by people extensively.
In the recent period, a kind of pure iron cooker that is environmentally protective, being harmless to the health just is gradually replacing existing traditional cooker, such as：
The poles the Ji Chuan pot of Japan.
Although in terms of pure iron has the advantages that advantage on ingredient and easy punch forming, steel plate after molding due to
Mainly based on ferritic structure, quality is softer, though using common heat treatment process also be difficult to reach satisfied hardness and
Intensity, while its poor corrosion resistance, easy get rusty also affect its effect used.A kind of special nitriding work must be used
Skill will also improve its corrosion resistance while steel plate hardness and strength after increasing molding.
Traditional gas nitriding or nitrogen-carbon cocementing process mainly for medium carbon steel product, such as：Gear etc. requires resistance to
Mill, corrosion resistant part, the nitriding of ultra-low-carbon steel or nitrocarburizing or a newer field are suitble to the ultralow of nitrocarburizing
Carbon steel on the basis of meeting intensity and hardness requirement in composition design in terms of corrosion resistance in addition to will will also be ground
System.A kind of mouldabilities of CN96190898.X [Co., Ltd. of Nippon Steel] and the excellent nitrided steel and its punch forming system of nitriding characteristics
Product, it contains (based on weight)：C：0.0002~0.08% or less, Si：0.005~1.00%, Mn：0.010~
3.00%, P：0.001~0.150%, N：0.0002~0.0100%, Cr：0.15 or more~5.00%, Al：0.060 or more~
2.00% (when C content be 0.0002-0.0100% or less when, Al become 0.10 or more~2.00% range in selectivity member
Element) and selected from Ti：0.010~1.00% and V：1 kind in 0.010~1.00% or 2 kinds of elements, remaining is Fe and can not keep away
The impurity exempted from, although some belongs to ultra-low-carbon steel in composition design, there are bright in the design of the corrosion-resistant factor (copper)
Aobvious deficiency, the anchoring effect of nitrogen, which easily leads to generate in forming process, stretches band, and secondly manganese content is higher, and discomfort shares
It is manufactured in cooker.
Therefore it provides a kind of gas nitrocarburizing ultralow carbon cold-rolled steel plate and its manufacturing method are for solving current cooker
It is had a very important significance with steel, while also there is the extensive market demand.
Invention content
A kind of gas nitrocarburizing ultralow carbon cold-rolled steel plate and its manufacturing method.The steel plate have excellent punching press, at
Type performance, and workpiece after molding can form certain thickness height by gas nitrocarburizing or gas nitriding in surface of steel plate
Hardness, fine and close corrosion-resistant layer of nitride film are particularly suitable for manufacture iron cooker.
To achieve the above object, the present invention is realized using following technical scheme：
A kind of gas nitrocarburizing ultralow carbon cold-rolled steel plate, the chemical component weight percentage of cold-rolled steel sheet are：C
0.002%~0.020%, Si 0.016%~0.030%, Mn 0.08%~0.16%, P≤0.015%, S≤0.012%,
Al 0.030%~0.30%, Cu 0.01%~0.10%, remaining is Fe and inevitable impurity.
Each element effect is as follows：
C：It is the main intensified element of steel, the height of carbon content directly affects the intensity and ductility of steel plate, carbon content
It reduces, intensity declines, and punching press and processability are better.Meanwhile carbon content is in a certain range, it is more high more be conducive to nitriding shape
At high rigidity, fine and close compound film layer, therefore, two aspect performances, the weight percent control of C content of the invention are considered
Ranging from 0.002%~0.020% (wt), preferably：0.010%~0.018% (wt).
Si：As reducing agent and deoxidier, while Si has stronger solid solution ability in steel, can increase the intensity of steel
With hardness, but the increase of Si contents also increases the brittleness of steel, influences its elongation percentage.Therefore, the present invention uses low silicon scheme, Si's
Weight percent control range is 0.016~0.030% (wt).
Mn：Its main function is solution strengthening, can enhance steel toughness and ductility, improves the processability of steel.
But manganese itself is the element to human health, has the function of destroying the nervous system of people, but manganese is more difficult in smelting process
Removal, therefore, the comprehensive factor present invention above is by the scope control of Mn in 0.08~0.16% (wt).
The fewer P≤0.015%, the impurity element in steel the better.
The fewer S≤0.012%, the impurity in steel the better.
Al：Aluminium preferentially can form aluminum nitride compound in nitriding process with N, and dispersion-strengthened action is played in steel,
Aluminium is also improved the effect of corrosion resistance in steel simultaneously while crystal grain thinning, the weight percent control of aluminium in the present invention
Range 0.03%~0.30% (wt), preferably：0.09%~0.20% (wt).
Cu：Copper has the function of improving corrosion resistance, while copper or the micro member beneficial to human body in steel
Element, therefore the control range of its weight percent is 0.01%~0.10% (wt) in the present invention, preferably：0.03%~
0.08% (wt).
A kind of manufacturing method of gas nitrocarburizing ultralow carbon cold-rolled steel plate, the process route of preparation are：Molten iron is located in advance
Reason-converter smelting-refining treatment-continuous casting-hot continuous rolling-section cooling-cold rolling acid rolls-bell-type annealing-skin pass mill group-rewinding unit
Or cross shearing unit-finished product packing；
1) smelting and continuous casting：When smelting, using Fruit storage, nitrogen in steel content is reduced, when continuous casting, 10 DEG C≤molten steel
The degree of superheat≤30 DEG C, Casting speed≤1.3m/min, pulling rate match with the degree of superheat, and core is to control the stabilization of pulling rate, is avoided
It is mingled with and size fluctuation；
2) hot continuous rolling：1230~1270 DEG C of heating furnace bringing-up section temperature, 1060~1100 DEG C of finish rolling start rolling temperature, finish to gauge temperature
860~900 DEG C of degree, avoids two-phase section from rolling, and promotes even tissue refinement, reduces banded structure, and it is iron element to obtain microscopic structure
Body adds the hot-rolled sheet coil of pearlite, plate thickness to be 3.5~5.0mm；
3) cold rolling post-batch-annealing：400 DEG C~680 DEG C, 6-8 hours of annealing temperature；680 DEG C~730 DEG C, 5-7 hours；
730 DEG C keep the temperature 8-9 hours；730 DEG C~700 DEG C, 2-3 hours；700 DEG C~640 DEG C, 3-3.5 hours.
Compared with prior art, the beneficial effects of the invention are as follows：
A kind of gas nitrocarburizing ultralow carbon cold-rolled steel plate and its manufacturing method.The steel plate have excellent punching press, at
Type performance, and workpiece after molding can form certain thickness height by gas nitrocarburizing or gas nitriding in surface of steel plate
Hardness, fine and close, the layer of nitride film with excellent corrosion resistance.Meanwhile the impurity of insalubrity is eliminated in steel plate,
And it is added to wholesome trace element, it is particularly suitable for manufacture iron cooker.
Description of the drawings
Fig. 1 is cold rolling hood type annealing process figure in the present invention.
Specific implementation mode
Embodiments of the present invention are further illustrated with reference to specific embodiment：
A kind of gas nitrocarburizing ultralow carbon cold-rolled steel plate, the chemical component weight percentage of cold-rolled steel sheet are：C
0.002%~0.020%, Si 0.016%~0.030%, Mn 0.08%~0.16%, P≤0.015%, S≤0.012%,
Al 0.030%~0.30%, Cu 0.01%~0.10%, remaining is Fe and inevitable impurity.
Each element effect is as follows：
C：It is the main intensified element of steel, the height of carbon content directly affects the intensity and ductility of steel plate, carbon content
It reduces, intensity declines, and punching press and processability are better.Meanwhile carbon content is in a certain range, it is more high more be conducive to nitriding shape
At high rigidity, fine and close compound film layer, therefore, two aspect performances, the weight percent control of C content of the invention are considered
Ranging from 0.002%~0.020% (wt), preferably：0.010%~0.018% (wt).
Si：As reducing agent and deoxidier, while Si has stronger solid solution ability in steel, can increase the intensity of steel
With hardness, but the increase of Si contents also increases the brittleness of steel, influences its elongation percentage.Therefore, the present invention uses low silicon scheme, Si's
Weight percent control range is 0.016~0.030% (wt).
Mn：Its main function is solution strengthening, can enhance steel toughness and ductility, improves the processability of steel.
But manganese itself is the element to human health, has the function of destroying the nervous system of people, but manganese is more difficult in smelting process
Removal, therefore, the comprehensive factor present invention above is by the scope control of Mn in 0.08~0.16% (wt).
The fewer P≤0.015%, the impurity element in steel the better.
The fewer S≤0.012%, the impurity in steel the better.
Al：Aluminium preferentially can form aluminum nitride compound in nitriding process with N, and dispersion-strengthened action is played in steel,
Aluminium is also improved the effect of corrosion resistance in steel simultaneously while crystal grain thinning, the weight percent control of aluminium in the present invention
Range 0.03%~0.30% (wt), preferably：0.09%~0.20% (wt).
Cu：Copper has the function of improving corrosion resistance, while copper or the micro member beneficial to human body in steel
Element, therefore the control range of its weight percent is 0.01%~0.10% (wt) in the present invention, preferably：0.03%~
0.08% (wt).
A kind of manufacturing method of gas nitrocarburizing ultralow carbon cold-rolled steel plate, the process route of preparation are：Molten iron is located in advance
Reason-converter smelting-refining treatment-continuous casting-hot continuous rolling-section cooling-cold rolling acid rolls-bell-type annealing-skin pass mill group-rewinding unit
Or cross shearing unit-finished product packing；
1) smelting and continuous casting：When smelting, using Fruit storage, nitrogen in steel content is reduced, when continuous casting, 10 DEG C≤molten steel
The degree of superheat≤30 DEG C, Casting speed≤1.3m/min, pulling rate should be stablized, and strand edge requires cleaning, deburring.Molten steel overheat is straight
Connect influence billet quality, the degree of superheat is too low to be easily introduced impurity, excessively high to cause to be segregated, it is also possible to cause bleedout accident to occur, because
This, molten steel overheat of the present invention controls >=10 DEG C ,≤30 DEG C, preferably 20 ± 5 DEG C；Pulling rate matches with the degree of superheat, and core is control
The stabilization of pulling rate processed, avoids being mingled with and size fluctuation；
2) hot continuous rolling：1230~1270 DEG C of heating furnace bringing-up section temperature, 1060~1100 DEG C of finish rolling start rolling temperature, finish to gauge temperature
860~900 DEG C of degree, avoids two-phase section from rolling, and promotes even tissue refinement, reduces banded structure, and it is iron element to obtain microscopic structure
Body adds the hot-rolled sheet coil of pearlite, plate thickness to be 3.5~5.0mm；
It is steel billet overheat, burning in order to prevent that bringing-up section temperature, which selects 1230~1270 DEG C,；Final rolling temperature selection 1060~
1100 DEG C mainly reduce unit load, and finishing temperature selection Ar3 or more can promote even tissue to refine, reduce band-like group
It knits.
3) cold rolling post-batch-annealing：400 DEG C~680 DEG C, 6-8 hours of annealing temperature；680 DEG C~730 DEG C, 5-7 hours；
730 DEG C keep the temperature 8-9 hours；730 DEG C~700 DEG C, 2-3 hours；700 DEG C~640 DEG C, 3-3.5 hours；Specific annealing process curve
See attached drawing 1.Annealing heat preservation uniformly refines more than recrystallization temperature first, being conducive to ferrite, reduces tissue intensity, is conducive to punching
Molded, the pinning effect with nitrogen content measure Collaborative Control nitrogen is reduced in smelting reduces the formation of luders band, improves
Finished surface quality；Second is that reducing the machining stress generated due to cold rolling, material hardness is reduced, standard is done for next step punch forming
It is standby.
Most afterwards after user's punching press, carry out nitrocarburizing processing, design parameter can according to user require workpiece strength with
Hardness determines hardening heat and cooling rate.
Below by embodiment, invention is further explained.It rolls rear model and carries out bell-type annealing processing, and respectively
The steel plate hardness number handled by defined nitrocarburizing after detection molding, HV hardness use more than 680 in the present invention
Preferred component formula HV hardness can reach 720 or more, have preferable hardness and film layer compactness after display element nitriding.Table 1- tables
3 be the component list, preparation treatment process table and performance table of embodiment respectively.
Table 1：Component list
2 process parameter table of table
Table 3：Performance table
Note：1. nitrogen-carbon cocementing process, 620 DEG C of adjusting atmosphere control nitrogen gesture, based on carburizing, 1 hour time, and then 580
DEG C improve ammonia ratio, carry out nitrocarburizing, 1.5 hours time, parameter can be finely adjusted in practical operation, with obtain not
Same properties of product.2. in the NaCl aqueous solutions that corrosion rate is 5%, 30 days test results of soaking at room temperature.
The compactness and hardness of nitriding layer are to influence the key factor of product corrosion resistance, and embodiment shows, with aluminium,
The increase of copper content, the Vickers hardness and corrosion resistance of steel plate have the raising of certain amplitude, and nitride thickness is substantially not
Become.
Claims (5)
1. a kind of gas nitrocarburizing ultralow carbon cold-rolled steel plate, which is characterized in that the chemical component weight percentage of cold-rolled steel sheet
Than for：C 0.002%~0.020%, Si 0.016%~0.030%, Mn 0.08%~0.16%, P≤0.015%, S≤
0.012%, Al 0.030%~0.30%, Cu 0.01%~0.10%, remaining is Fe and inevitable impurity.
2. a kind of gas nitrocarburizing ultralow carbon cold-rolled steel plate according to claim 1, which is characterized in that the cold rolling
The weight percent of C is preferably in steel plate：0.010%~0.018%.
3. a kind of gas nitrocarburizing ultralow carbon cold-rolled steel plate according to claim 1, which is characterized in that the cold rolling
The weight percent of Al is preferably in steel plate：0.09%~0.20%.
4. a kind of gas nitrocarburizing ultralow carbon cold-rolled steel plate according to claim 1, which is characterized in that the cold rolling
The weight percent of Cu is preferably in steel plate：0.03%~0.08%.
5. a kind of manufacturing method of gas nitrocarburizing ultralow carbon cold-rolled steel plate as described in claim 1, the technique of preparation
Route is：Molten iron pretreatment-converter smelting-refining treatment-continuous casting-hot continuous rolling-section cooling-cold rolling acid rolls-and bell-type annealing-is flat
Complete machine group-rewinding unit or cross shearing unit-finished product packing；It is characterized in that：
1) smelting and continuous casting：When smelting, using Fruit storage, nitrogen in steel content is reduced, when continuous casting, 10 DEG C≤molten steel overheat
≤ 30 DEG C of degree, Casting speed≤1.3m/min；
2) hot continuous rolling：1230~1270 DEG C of heating furnace bringing-up section temperature, 1060~1100 DEG C of finish rolling start rolling temperature, finishing temperature
860~900 DEG C, it is the hot-rolled sheet coil that ferrite adds pearlite to obtain microscopic structure, and plate thickness is 3.5~5.0mm；
3) cold rolling post-batch-annealing：400 DEG C~680 DEG C, 6-8 hours of annealing temperature；680 DEG C~730 DEG C, 5-7 hours；730℃
Heat preservation 8-9 hours；730 DEG C~700 DEG C, 2-3 hours；700 DEG C~640 DEG C, 3-3.5 hours.
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| CN115404324A (en) * | 2022-07-27 | 2022-11-29 | 江苏甬金金属科技有限公司 | Ultrathin stainless steel band for electronic device and preparation method thereof |
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