CN109207850A - High-service-strength enamel steel plate and manufacturing method thereof - Google Patents
High-service-strength enamel steel plate and manufacturing method thereof Download PDFInfo
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- CN109207850A CN109207850A CN201811128237.2A CN201811128237A CN109207850A CN 109207850 A CN109207850 A CN 109207850A CN 201811128237 A CN201811128237 A CN 201811128237A CN 109207850 A CN109207850 A CN 109207850A
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- 210000003298 dental enamel Anatomy 0.000 title claims abstract description 178
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 98
- 239000010959 steel Substances 0.000 title claims abstract description 98
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000010304 firing Methods 0.000 claims abstract description 79
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 59
- 229910052742 iron Inorganic materials 0.000 claims abstract description 29
- 239000000126 substance Substances 0.000 claims abstract description 25
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 22
- 238000005096 rolling process Methods 0.000 claims abstract description 21
- 238000007670 refining Methods 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 8
- 238000009628 steelmaking Methods 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 6
- 229910001563 bainite Inorganic materials 0.000 claims description 22
- 229910052799 carbon Inorganic materials 0.000 claims description 18
- 229910000859 α-Fe Inorganic materials 0.000 claims description 16
- 238000009749 continuous casting Methods 0.000 claims description 14
- 229910001562 pearlite Inorganic materials 0.000 claims description 8
- 239000002244 precipitate Substances 0.000 claims description 8
- 238000005098 hot rolling Methods 0.000 claims description 7
- 239000011159 matrix material Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 238000003860 storage Methods 0.000 abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 238000005266 casting Methods 0.000 abstract 4
- 238000004534 enameling Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 36
- 229910052573 porcelain Inorganic materials 0.000 description 11
- 238000001556 precipitation Methods 0.000 description 10
- 241000251468 Actinopterygii Species 0.000 description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 7
- 239000011572 manganese Substances 0.000 description 7
- 239000002320 enamel (paints) Substances 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 206010000269 abscess Diseases 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 235000015170 shellfish Nutrition 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 description 1
- 230000007704 transition Effects 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C21D2211/002—Bainite
-
- 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
- C21D2211/004—Dispersions; Precipitations
-
- 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)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a high-service-strength enamel steel plate and a manufacturing method thereof, wherein the steel plate comprises the following chemical components in percentage by weight: 0.1-0.15%, Si: 0.3 to 0.5%, Mn: 1 to 1.8% of P<0.013％，S<0.005%, Alt: 0.020-0.050%, V: 0.04-0.07%, N: 0.011-0.015% and the balance of iron and impurities; the manufacturing method comprises the following steps: 1) pretreating molten iron, steelmaking in a converter and refining to obtain casting blank molten iron; 2) continuously casting molten iron to prepare a casting blank; 3) heating a casting blank; 4) carrying out multi-pass rough rolling and finish rolling to obtain a finish rolled plate; 5) after laminar cooling, coiling to obtain a finished product; the yield strength of the steel plate is 460-550 MPa; after enameling and firing, the yield strength is 400 to 460MPa, and can be used for manufacturing 9000m of water storage capacity3The lower layer of the enamel split tank wall is arranged above the tank.
Description
Technical field
The present invention relates to a kind of enamel sheet and its manufacturing method, in particular to a kind of Steel for enamel of high military service intensity
Plate and its manufacturing method.
Background technique
Large-scale water processing establishments such as water tank, sewage treatment pot some now etc. are all made of enamel assembling tank, enamel assembling
The main component of tank is enamelled pressed steel, and for the dedicated hot rolled steel plate enamel coating of enamel and enamel firing forms.Because of tank body, lower layer is born
Hydraulic pressure upper layer it is big, the lower layer of tank body generally uses thick steel plates, and upper layer uses thin specification steel plate.After steel plate enamel firing
Yield strength is steel plate military service intensity, and tank body moisture storage capacity is bigger, and tank body lower layer is more partial in position, then steel plate military service intensity is required to get over
Height, i.e. yield strength after steel plate enamel firing are higher.
Thick steel plates obtain that high military service intensity difficulty is bigger, and thick steel plates are in warm first compared with thin specification steel plate
Drafts is small when rolling, and it is more difficult to obtain high rolled intensity, secondly uniform in order to grill thoroughly when thick steel plates enamel firing, when enamel firing
Between it is longer than thin specification steel plate, intensity decline is more after thick steel plates enamel firing.
Yield strength is not high after the thick specification hot-rolled enamel firing of domestic assembled tank lower layer at present, generally below 300MPa,
It is only applicable to production moisture storage capacity 5000m3And tank body below, lack high-intensitive required for the production bigger tank body of moisture storage capacity ward off
Porcelain steel plate.
This is the deficiencies in the prior art place.
Summary of the invention
In view of the deficiencies of the prior art, the technical problem to be solved in the present invention is to provide a kind of enamel of high military service intensity use
Steel plate and its manufacturing method, it is suitable for making larger assembled tank lower layer thick steel plates.
The present invention provides a kind of enamel sheets of high military service intensity, and the chemical component of the steel plate is by weight percentage
For C:0.1~0.15%, Si:0.3~0.5%, Mn:1~1.8%, P < 0.013%, S < 0.005%, Alt:0.020~
0.050%, V:0.04~0.07%, N:0.011~0.015%, remaining is iron and inevitable impurity.
The steel plate thickness is 10~14mm；Its yield strength is 460~550MPa, and tensile strength is 620~710MPa,
Elongation after fracture A50mmIt is 28~40%.
After the steel plate enamel firing, yield strength is 400~460MPa, and tensile strength is 560~650MPa, extension of having no progeny
Rate is 28~41%.
The steel plate microstructure is ferrite+pearlite+bainite, and bainite volume is greater than 30%, ferrite and shellfish
The average grain size of family name's body less than 10 μm, in matrix Dispersed precipitate VN, V (C, N), VC precipitated phase, 90% or more precipitation
The size of phase is less than 50nm.
Steel plate after ground coat enamel enamel firing, yield strength are 400~460MPa, and the intensity decline after ground coat enamel enamel firing is less, former
Because being to organize the analysis still for ferrite+pearlite+bainite, crystallite dimension slightly growth but still less than 10 μm after ground coat enamel enamel firing
Object size slightly increases out, and VC, VC size has been precipitated still less than 50nm in 80% or more precipitation size during enamel firing
Less than 10nm, build up and precipitation strength ensure that the high intensity after ground coat enamel enamel firing.Steel plate after ground coat enamel enamel firing is warded off through overglaze
After burning, yield strength is 400~460MPa, applies after overglaze steel plate after apply ground coat enamel compared with steel plate, yield strength it is slightly higher or
Quite, reason is to organize after overglaze enamel firing still for ferrite+pearlite+bainite, crystallite dimension slightly increase but still less than
10 μm, precipitation size slightly increases, and 70% or more precipitation size continues to be precipitated still less than 50nm, and during enamel firing
VC, so that applying steel plate after overglaze, after apply ground coat enamel compared with steel plate, yield strength is slightly higher or suitable.
The present invention also provides a kind of manufacturing methods of above-mentioned enamel sheet, include the following steps:
(1) molten iron obtains the molten iron of the composition proportion of enamel sheet by pretreatment, pneumatic steelmaking and refining；Wherein,
The chemical component of enamel sheet is by weight percentage are as follows: and C:0.1~0.15%, Si:0.3~0.5%, Mn:1~1.8%, P <
0.013%, S < 0.005%, Alt:0.020~0.050%, V:0.04~0.07%, N:0.011~0.015%, remaining is iron
With inevitable impurity；
(2) continuous casting: the molten iron after refining carries out continuous casting, and slab is made；
(3) slab is heated；
(4) two stages hot rolling: roughing is first carried out, then carries out finish rolling；
(5) it batches: by finish rolling plate by batching after section cooling, enamel sheet is made.
It further, is 1190~1250 DEG C to the temperature of slab heating.
Further, the finishing temperature of the finish rolling is 800~880 DEG C.
Further, the coiling temperature is 510~590 DEG C.
Further, the roughing is 5~7 passages, and the finish rolling is 6~7 passages.
Enamel sheet of the invention, compared with the enamel sheet used in the assembled tank of existing production, beneficial skill
Art effect is:
(1) the armor plate strength rank is high, has high-intensitive, the steel plate after high temperature enamel firing twice especially after enamel firing,
Yield strength >=400MPa can be used for making moisture storage capacity 9000m3Or more enamel assembling tank lower layer's tank skin.
(2) most of enamel sheets intensity after enamel firing twice can decline 1/3 or more, and steel plate of the invention is strong after warding off
Degree decline is few, declines only tens megapascal, and while intensity after obtaining high enamel firing, intensity, that is, hot-rolled steel plate state is strong before enamel firing
It is not also too high for spending, and rushes the progress of bolt hole and curved arc process before being conducive to enamel firing, and reduce the abrasion of each workpiece.
(3) enamel sheet of the invention has good fish scaling resistance.
Detailed description of the invention
The metallographic structure of enamel sheet prepared by Fig. 1 the embodiment of the present invention 1.
The precipitate of enamel sheet prepared by Fig. 2 the embodiment of the present invention 1.
Specific embodiment
The design principle of each chemical element in the enamel sheet of invention are as follows:
C:0.1~0.15% in the chemical component of enamel sheet of the present invention, the carbide for being dissolved carbon and precipitation are
Steel plate provides intensity, and V (C, N), the VC of precipitation play the role of precipitation strength, and V (C, N), the VC particle of disperse educt can inhibit crystalline substance
Grain length is big, ensure that steel plate crystal grain is tiny, and small grains ensure that steel plate all has high intensity, especially enamel firing before and after enamel firing
The VC being precipitated in the process still has high intensity after having ensured steel plate enamel firing, while V (C, N), VC can be used as hydrogen trap, improve steel
The fish scaling resistance of plate.Carbon is too low, it cannot be guaranteed that the intensity of steel, carbon is too high, unfavorable to enamel process, and enamel process is caused to occur
Abscess defect, therefore C content control is 0.1~0.15%.
Si:0.3~0.5% in the chemical component of enamel sheet of the present invention, Si are as deoxidier for removing molten steel
In oxygen, Si too high levels can reduce enamel adherence, damage surface quality, therefore select the control of Si content 0.3~
0.5%.
Mn content in the chemical component of enamel sheet of the present invention selects that structure refinement can be made in 1~1.8%, Mn, and
Make that particle size is precipitated and particle average headway is precipitated to reduce.Manganese is solution strengthening element, can reduce austenite and be transformed into iron element
The phase transition temperature of body expands hot processing temperature region, is conducive to refining grain size, yield strength and the tension for improving steel are strong
Degree.Intensity is excessively high when manganese content is excessively high, is unfavorable for the punching and curved arc process of steel plate, therefore the selection of Mn content is 1~1.8%.
P < 0.013% in the chemical component of enamel sheet of the present invention, phosphorus are impurity element, are easy in crystal boundary segregation,
It will increase steel plate brittleness, damage the formability of steel plate, therefore by phosphorus control below 0.013%.
S < 0.005% in the chemical component of enamel sheet of the present invention, it is easy to form large-sized when sulfur content is higher
Manganese sulfide significantly reduces the plasticity of steel plate, is also easy to generate red brittleness when in addition sulfur content is higher, therefore sulfur content is not to be exceeded
0.005%.
Alt in the chemical component of enamel sheet of the present invention is selected 0.02~0.05%, and aluminium is strong deoxidier, can
Inhibit the generation of other oxides, aluminium is reacted with oxygen generates aluminium oxide, and the moulding of aluminium oxide is poor, and a large amount of alumina inclusion can damage
The processability of evil steel plate, therefore select a certain amount of aluminium to deoxidation, Alt is selected 0.02~0.05%.
V selection in the chemical component of enamel sheet of the present invention 0.04~0.07%, V and N, C formed VN, V (C,
N), VC, VN, V (C, N), the VC particle of disperse educt can inhibit crystal grain and grow up, ensure that steel plate crystal grain is tiny, provide for steel plate
Intensity, VN, V (C, N), VC have precipitation strength effect, the VC being especially precipitated during enamel firing, so that the steel plate after enamel firing
Higher intensity is kept, while VN, V (C, N), VC are good hydrogen trap, ensure the fish scaling resistance of glassed steel.
N:0.011~0.015% in the chemical component of enamel sheet of the present invention, using N and V-arrangement at small and dispersed point
VN, V (C, N) precipitate of cloth, provides intensity for steel plate, provides hydrogen trap, and N content is excessive, large scale VN easy to form or
AlN damages plate property, so N content control is 0.011~0.015%.
The present invention is described in further detail with example with reference to the accompanying drawing.
The chemical component of enamel sheet, wt.% in 1 Examples 1 to 5 of table
Embodiment 1
There is high-intensitive enamel sheet after a kind of enamel firing, chemical component is shown in Table 1 by weight percentage, with a thickness of
11mm。
The preparation method of above-mentioned enamel sheet, includes the following steps:
Step 1, molten iron obtains the molten iron of the composition proportion of enamel sheet by pretreatment, pneumatic steelmaking and refining,
In, the chemical component of enamel sheet is shown in Table 1 by weight percentage；
Step 2, continuous casting: the molten iron after refining carries out continuous casting, and slab is made；
Step 3, heat to slab: the temperature by computer heating control slab is 1220 DEG C；
Step 4, two stages hot rolling: first carrying out 6 passage roughing, then carries out 7 passage finish rolling, and finishing temperature is 860 DEG C；
Step 5, batch: by finish rolling plate by batching after section cooling, control coiling temperature is 540 DEG C, is made and wards off
Porcelain steel plate.
The metallographic structure that enamel sheet is made in the above method is as shown in Figure 1, it is seen that its microstructure is ferrite+pearly-lustre
Body+bainite, bainite volume is greater than 30%, and the average grain size of ferrite and bainite is less than 10 μm, disperse in matrix
It is dispersed with VN, V (C, N), VC precipitated phase, the size of 90% or more precipitated phase is less than 50nm, Second Phase Precipitation object transmission electron microscope
Figure is as shown in Figure 2.
Enamel sheet made from the above method, yield strength 498MPa, tensile strength 667MPa, extension of having no progeny
Rate A50mmIt is 35%.
To enamel sheet made from the above method, enamel coating is carried out, specific process parameter is as follows with result:
The two-sided application of slip twice and enamel firing, 890 DEG C of ground coat enamel enamel firing temperature, ground coat enamel enamel firing time 20min, ground coat enamel are carried out to steel plate
Steel plate after enamel firing, yield strength 431MPa, tensile strength 605MPa, elongation after fracture A50mmIt is 31%；
Steel plate after applying ground coat enamel enamel firing carries out applying overglaze and enamel firing, 790 DEG C of overglaze enamel firing temperature, overglaze enamel firing time again
18min, the steel plate after ground coat enamel overglaze twice enamel firing, yield strength 440MPa, tensile strength 607MPa, extension of having no progeny
Rate A50mmIt is 31.5%.
Enamelled pressed steel made from the above method, ground coat enamel and overglaze glaze layer overall thickness are 300 μm, and after standing 6 months, observation is warded off
The two-sided surface condition of steel plate after porcelain, two-sided no squama is quick-fried, has good fish scaling resistance.
Enamelled pressed steel made from the above method meets moisture storage capacity 9000m3Or more enamel assembling tank lower layer tank skin
Requirement.
Embodiment 2
There is high-intensitive enamel sheet after a kind of enamel firing, chemical component is shown in Table 1 by weight percentage, with a thickness of
13mm。
The preparation method of above-mentioned enamel sheet, includes the following steps:
Step 1, molten iron obtains the molten iron of the composition proportion of enamel sheet by pretreatment, pneumatic steelmaking and refining,
In, the chemical component of enamel sheet is shown in Table 1 by weight percentage；
Step 2, continuous casting: the molten iron after refining carries out continuous casting, and slab is made；
Step 3, heat to slab: the temperature by computer heating control slab is 1230 DEG C；
Step 4, two stages hot rolling: first carrying out 6 passage roughing, then carries out 7 passage finish rolling, and finishing temperature is 840 DEG C；
Step 5, batch: by finish rolling plate by batching after section cooling, control coiling temperature is 540 DEG C, is made and wards off
Porcelain steel plate.
The microstructure that enamel sheet is made in the above method is ferrite+pearlite+bainite, and bainite volume is greater than
30%, the average grain size of ferrite and bainite less than 10 μm, in matrix Dispersed precipitate VN, V (C, N), VC precipitated phase,
The size of 90% or more precipitated phase is less than 50nm.
Enamel sheet made from the above method, yield strength 471MPa, tensile strength 650MPa, extension of having no progeny
Rate A50mmIt is 33.5%.
To enamel sheet made from the above method, enamel coating is carried out, specific process parameter is as follows with result:
The two-sided application of slip twice and enamel firing, 890 DEG C of ground coat enamel enamel firing temperature, ground coat enamel enamel firing time 23min, ground coat enamel are carried out to steel plate
Steel plate after enamel firing, yield strength 407MPa, tensile strength 581MPa, elongation after fracture A50mmIt is 35.5%；
Steel plate after applying ground coat enamel enamel firing carries out applying overglaze and enamel firing, 790 DEG C of overglaze enamel firing temperature, overglaze enamel firing time again
21min, the steel plate after ground coat enamel overglaze twice enamel firing, yield strength 405MPa, tensile strength 588MPa, extension of having no progeny
Rate A50mmIt is 34%.
Enamelled pressed steel made from the above method, ground coat enamel and overglaze glaze layer overall thickness are 200 μm, and after standing 6 months, observation is warded off
The two-sided surface condition of steel plate after porcelain, two-sided no squama is quick-fried, has good fish scaling resistance.
Enamelled pressed steel made from the above method meets moisture storage capacity 9000m3Or more enamel assembling tank lower layer tank skin
Requirement.
Embodiment 3
There is high-intensitive enamel sheet after a kind of enamel firing, chemical component is shown in Table 1 by weight percentage, with a thickness of
14mm。
The preparation method of above-mentioned enamel sheet, includes the following steps:
Step 1, molten iron obtains the molten iron of the composition proportion of enamel sheet by pretreatment, pneumatic steelmaking and refining,
In, the chemical component of enamel sheet is shown in Table 1 by weight percentage；
Step 2, continuous casting: the molten iron after refining carries out continuous casting, and slab is made；
Step 3, heat to slab: the temperature by computer heating control slab is 1210 DEG C；
Step 4, two stages hot rolling: first carrying out 6 passage roughing, then carries out 7 passage finish rolling, and finishing temperature is 840 DEG C；
Step 5, batch: by finish rolling plate by batching after section cooling, control coiling temperature is 520 DEG C, is made and wards off
Porcelain steel plate.
The microstructure that enamel sheet is made in the above method is ferrite+pearlite+bainite, and bainite volume is greater than
30%, the average grain size of ferrite and bainite less than 10 μm, in matrix Dispersed precipitate VN, V (C, N), VC precipitated phase,
The size of 90% or more precipitated phase is less than 50nm.
Enamel sheet made from the above method, yield strength 461MPa, tensile strength 630MPa, extension of having no progeny
Rate A50mmIt is 38%.
To enamel sheet made from the above method, enamel coating is carried out, specific process parameter is as follows with result:
The two-sided application of slip twice and enamel firing, 890 DEG C of ground coat enamel enamel firing temperature, ground coat enamel enamel firing time 24min, ground coat enamel are carried out to steel plate
Steel plate after enamel firing, yield strength 404MPa, tensile strength 569MPa, elongation after fracture A50mmIt is 39.5%；
Steel plate after applying ground coat enamel enamel firing carries out applying overglaze and enamel firing, 790 DEG C of overglaze enamel firing temperature, overglaze enamel firing time again
22min, the steel plate after ground coat enamel overglaze twice enamel firing, yield strength 410MPa, tensile strength 571MPa, extension of having no progeny
Rate A50mmIt is 37%.
Enamelled pressed steel made from the above method, ground coat enamel and overglaze glaze layer overall thickness are 360 μm, and after standing 6 months, observation is warded off
The two-sided surface condition of steel plate after porcelain, two-sided no squama is quick-fried, has good fish scaling resistance.
Enamelled pressed steel made from the above method meets moisture storage capacity 9000m3Or more enamel assembling tank lower layer tank skin
Requirement.
Embodiment 4
There is high-intensitive enamel sheet after a kind of enamel firing, chemical component is shown in Table 1 by weight percentage, with a thickness of
10mm。
The preparation method of above-mentioned enamel sheet, includes the following steps:
Step 1, molten iron obtains the molten iron of the composition proportion of enamel sheet by pretreatment, pneumatic steelmaking and refining,
In, the chemical component of enamel sheet is shown in Table 1 by weight percentage；
Step 2, continuous casting: the molten iron after refining carries out continuous casting, and slab is made；
Step 3, heat to slab: the temperature by computer heating control slab is 1220 DEG C；
Step 4, two stages hot rolling: first carrying out 7 passage roughing, then carries out 6 passage finish rolling, and finishing temperature is 880 DEG C；
Step 5, batch: by finish rolling plate by batching after section cooling, control coiling temperature is 560 DEG C, is made and wards off
Porcelain steel plate.
The microstructure that enamel sheet is made in the above method is ferrite+pearlite+bainite, and bainite volume is greater than
30%, the average grain size of ferrite and bainite less than 10 μm, in matrix Dispersed precipitate VN, V (C, N), VC precipitated phase,
The size of 90% or more precipitated phase is less than 50nm.
Enamel sheet made from the above method, yield strength 523MPa, tensile strength 689MPa, extension of having no progeny
Rate A50mmIt is 32%.
To enamel sheet made from the above method, enamel coating is carried out, specific process parameter is as follows with result:
The two-sided application of slip twice and enamel firing, 890 DEG C of ground coat enamel enamel firing temperature, ground coat enamel enamel firing time 18min, ground coat enamel are carried out to steel plate
Steel plate after enamel firing, yield strength 451MPa, tensile strength 617MPa, elongation after fracture A50mmIt is 35%；
Steel plate after applying ground coat enamel enamel firing carries out applying overglaze and enamel firing, 790 DEG C of overglaze enamel firing temperature, overglaze enamel firing time again
17min, the steel plate after ground coat enamel overglaze twice enamel firing, yield strength 442MPa, tensile strength 610MPa, extension of having no progeny
Rate A50mmIt is 34%.
Enamelled pressed steel made from the above method, ground coat enamel and overglaze glaze layer overall thickness are 400 μm, and after standing 6 months, observation is warded off
The two-sided surface condition of steel plate after porcelain, two-sided no squama is quick-fried, has good fish scaling resistance.
Enamelled pressed steel made from the above method meets moisture storage capacity 9000m3Or more enamel assembling tank lower layer tank skin
Requirement.
Embodiment 5
There is high-intensitive enamel sheet after a kind of enamel firing, chemical component is shown in Table 1 by weight percentage, with a thickness of
11mm。
The preparation method of above-mentioned enamel sheet, includes the following steps:
Step 1, molten iron obtains the molten iron of the composition proportion of enamel sheet by pretreatment, pneumatic steelmaking and refining,
In, the chemical component of enamel sheet is shown in Table 1 by weight percentage；
Step 2, continuous casting: the molten iron after refining carries out continuous casting, and slab is made；
Step 3, heat to slab: the temperature by computer heating control slab is 1240 DEG C；
Step 4, two stages hot rolling: first carrying out 5 passage roughing, then carries out 7 passage finish rolling, and finishing temperature is 860 DEG C；
Step 5, batch: by finish rolling plate by batching after section cooling, control coiling temperature is 540 DEG C, is made and wards off
Porcelain steel plate.
The microstructure that enamel sheet is made in the above method is ferrite+pearlite+bainite, and bainite volume is greater than
30%, the average grain size of ferrite and bainite less than 10 μm, in matrix Dispersed precipitate VN, V (C, N), VC precipitated phase,
The size of 90% or more precipitated phase is less than 50nm.
Enamel sheet made from the above method, yield strength 480MPa, tensile strength 657MPa, extension of having no progeny
Rate A50mmIt is 36.5%.
To enamel sheet made from the above method, enamel coating is carried out, specific process parameter is as follows with result:
The two-sided application of slip twice and enamel firing, 890 DEG C of ground coat enamel enamel firing temperature, ground coat enamel enamel firing time 20min, ground coat enamel are carried out to steel plate
Steel plate after enamel firing, yield strength 425MPa, tensile strength 601MPa, elongation after fracture A50mmIt is 32%；
Steel plate after applying ground coat enamel enamel firing carries out applying overglaze and enamel firing, 790 DEG C of overglaze enamel firing temperature, overglaze enamel firing time again
18min, the steel plate after ground coat enamel overglaze twice enamel firing, yield strength 427MPa, tensile strength 609MPa, extension of having no progeny
Rate A50mmIt is 32.5%.
Enamelled pressed steel made from the above method, ground coat enamel and overglaze glaze layer overall thickness are 300 μm, and after standing 6 months, observation is warded off
The two-sided surface condition of steel plate after porcelain, two-sided no squama is quick-fried, has good fish scaling resistance.
Enamelled pressed steel made from the above method meets moisture storage capacity 9000m3Or more enamel assembling tank lower layer tank skin
Requirement.
Claims (9)
1. a kind of enamel sheet of high military service intensity, which is characterized in that the chemical component of the steel plate is by weight percentage
C:0.1~0.15%, Si:0.3~0.5%, Mn:1~1.8%, P < 0.013%, S < 0.005%, Alt:0.020~
0.050%, V:0.04~0.07%, N:0.011~0.015%, remaining is iron and inevitable impurity.
2. enamel sheet as described in claim 1, which is characterized in that the steel plate thickness is 10~14mm；It surrenders strong
Degree is 460~550MPa, and tensile strength is 620~710MPa, elongation after fracture A50mmIt is 28~40%.
3. enamel sheet as described in claim 1, it is characterized in that: after the steel plate enamel firing, yield strength is 400~
460MPa, tensile strength are 560~650MPa, and elongation after fracture is 28~41%.
4. enamel sheet as described in claim 1, which is characterized in that the steel plate microstructure be ferrite+pearlite+
Bainite, bainite volume is greater than 30%, and the average grain size of ferrite and bainite is less than 10 μm, Dispersed precipitate in matrix
VN, V (C, N), VC precipitated phase, the size of 90% or more precipitated phase be less than 50nm.
5. a kind of manufacturing method of the enamel sheet of high military service intensity, which comprises the steps of:
(1) molten iron obtains the molten iron of the composition proportion of enamel sheet by pretreatment, pneumatic steelmaking and refining；Wherein, enamel
By weight percentage with the chemical component of steel plate are as follows: C:0.1~0.15%, Si:0.3~0.5%, Mn:1~1.8%, P <
0.013%, S < 0.005%, Alt:0.020~0.050%, V:0.04~0.07%, N:0.011~0.015%, remaining is iron
With inevitable impurity；
(2) continuous casting: the molten iron after refining carries out continuous casting, and slab is made；
(3) slab is heated；
(4) two stages hot rolling: roughing is first carried out, then carries out finish rolling；
(5) it batches: by finish rolling plate by batching after section cooling, enamel sheet is made.
6. manufacturing method as claimed in claim 5, which is characterized in that the temperature to slab heating is 1190~1250
℃。
7. manufacturing method as claimed in claim 5, which is characterized in that the finishing temperature of the finish rolling is 800~880 DEG C.
8. manufacturing method as claimed in claim 5, which is characterized in that the temperature batched is 510~590 DEG C.
9. manufacturing method as claimed in claim 5, which is characterized in that the roughing is 5~7 passages；The finish rolling is 6~7
Passage.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108048735A (en) * | 2017-11-23 | 2018-05-18 | 首钢集团有限公司 | Cold rolling enamel sheet and its production method |
| CN111519104A (en) * | 2020-05-12 | 2020-08-11 | 首钢集团有限公司 | Thin-gauge hot-rolled low-alloy high-strength steel and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102766822A (en) * | 2012-07-27 | 2012-11-07 | 宝山钢铁股份有限公司 | High-strength steel plate used for glass lining, and manufacturing method thereof |
| CN108396235A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | Hot-rolled thick steel plate for enamel matrix and manufacturing method thereof |
-
2018
- 2018-09-27 CN CN201811128237.2A patent/CN109207850B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102766822A (en) * | 2012-07-27 | 2012-11-07 | 宝山钢铁股份有限公司 | High-strength steel plate used for glass lining, and manufacturing method thereof |
| CN108396235A (en) * | 2017-02-05 | 2018-08-14 | 鞍钢股份有限公司 | Hot-rolled thick steel plate for enamel matrix and manufacturing method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108048735A (en) * | 2017-11-23 | 2018-05-18 | 首钢集团有限公司 | Cold rolling enamel sheet and its production method |
| CN111519104A (en) * | 2020-05-12 | 2020-08-11 | 首钢集团有限公司 | Thin-gauge hot-rolled low-alloy high-strength steel and preparation method thereof |
| CN111519104B (en) * | 2020-05-12 | 2021-06-15 | 首钢集团有限公司 | Thin-gauge hot-rolled low-alloy high-strength steel and preparation method thereof |
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