CN110527929A - A kind of boronated stainless steel slab and preparation method thereof that plasticity and toughness are excellent - Google Patents
A kind of boronated stainless steel slab and preparation method thereof that plasticity and toughness are excellent Download PDFInfo
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- CN110527929A CN110527929A CN201910773871.XA CN201910773871A CN110527929A CN 110527929 A CN110527929 A CN 110527929A CN 201910773871 A CN201910773871 A CN 201910773871A CN 110527929 A CN110527929 A CN 110527929A
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- C—CHEMISTRY; METALLURGY
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- 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
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- 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
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- 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
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Abstract
A kind of boronated stainless steel slab and preparation method thereof that plasticity and toughness are excellent, ingredient contain Cr 18.0~20.0%, Ni 12.0~15.0% by mass percentage, Mn 0.2~2.0%, B 0.5~1.5%, Si < 0.5%, C < 0.02%, remaining is Fe；20~80mm of thickness, tensile strength >=550MPa, room temperature elongation percentage >=18%, room temperature impact toughness >=200KJ/m2；Method are as follows: (1) smelting molten steel；(2) roughing after slab soaking heat preservation；(3) roughed bloom opens up double V-groove and monomer is made；Multiple monomers are stacked, vacuum welding；(4) common carbon steel board is welded in composite billet rear and front end；(5) after being heated to 1100~1150 DEG C of heat preservations, multistage hot deformation；(6) solution treatment will be carried out after straight carbon steel end cut, is air-cooled to room temperature.The method of the invention realizes the homogenization of boride, imperceptibility control, the templates and side for improving boronated stainless steel slab in production board to split degree；Technique production procedure is compact, is easy to implement mechanization and automation.
Description
Technical field
The invention belongs to metallurgical material technical field, in particular to a kind of boronated stainless steel slab that plasticity and toughness are excellent and its
Preparation method.
Background technique
As a kind of electric energy of carbon zero-emission, nuclear power developing is obtaining the attention of world community；The storage of spentnuclear fuel, fortune
Defeated process, it is necessary to reduce its reactivity using thermal neutron shielding material, prevent from returning to core critical.In natural boron element10The same position B
Element can effectively absorb thermal neutron, only generate soft γ photon and easy absorbed α particle later.Boron element is added to stainless steel
In, prepared mechanics and all more excellent boronated stainless steel of corrosion resisting property have relatively broad application in nuclear power field.Its
In, the different Service Environments such as spentnuclear fuel post-processing, storage and transport and condition, to the boron content of boronated stainless steel, slab and property
Can there be different requirements.
After adding boron element in stainless steel, a large amount of hard crisp cocrystallizing type boride can be precipitated in steel, and in austenite week
Enclose it is continuously distributed, not only deteriorate blank hot-working character, but also cause production board room-temperature mechanical property especially plasticity and
Toughness sharply declines.If prepared slab thickness increases, the size of solidified structure and the inhomogeneities of distribution can significantly add
It is acute.In the subsequent operation of rolling, the uneven transmitting of the roll-force on rolled piece surface to center portion region leads to production board through thickness
Direction crystal grain, ingredient are extremely difficult to higher uniformity, and the mechanical property of final finished plate is difficult to meet nuclear power field military service
It is required that.
As the main method for preparing high-boron stainless steel plate at present, powder metallurgic method has preparing boronated stainless steel thin plate
Unique technical advantage, but for boronated stainless steel slab, since the difficulty of sinter molding is larger, lumber recovery is lower, and
Long preparation period, preparation cost is costly.
Summary of the invention
The above problem existing for performance characteristic and technology of preparing for boracic steel thick plate, the present invention provides a kind of modeling is tough
Property excellent boronated stainless steel slab and preparation method thereof, pass through the method for introducing composite rolling, improve boronated stainless steel slab
Accumulation compression ratio, obtain even tissue, tiny, the excellent boronated stainless steel slab of room-temperature mechanical property.
The ingredient of the excellent boronated stainless steel slab of plasticity and toughness of the invention contain by mass percentage Cr 18.0~
20.0%, Ni 12.0~15.0%, Mn 0.2~2.0%, B 0.5~1.5%, Si < 0.5%, C < 0.02%, remaining is
Fe and inevitable impurity element；20~80mm of its thickness, tensile strength >=550MPa, room temperature elongation percentage >=18%, room temperature
Impact flexibility >=200 KJ/m2。
In the excellent boronated stainless steel slab of above-mentioned plasticity and toughness, the boride of partial size≤3.0 μm accounts for whole boron in tissue
20% or more compound gross mass, the boride of partial size >=15.0 μm account for whole 5% or less boride gross masses.
The preparation method of the excellent boronated stainless steel slab of plasticity and toughness of the invention sequentially includes the following steps:
(1) then boronated stainless steel slab is made by molding or continuous casting in molten steel by smelting molten steel；Boronated stainless steel slab
With a thickness of 100~250mm, ingredient contains Cr 18.0~20.0% by mass percentage, Ni 12.0~15.0%, Mn 0.2~
2.0%, B 0.5~1.5%, Si≤0.5%, C≤0.02%, remaining is Fe and inevitable impurity element；
(2) boronated stainless steel slab is put into heating furnace and is warming up to soaking temperature T with furnace, and keep the temperature 90~150min, so
Multi-pass roughing is carried out afterwards, and roughing finishing temperature is 900~1000 DEG C, draught per pass △ h1Meet 10mm≤△ h1≤
H1Mm obtains thickness 30~80mm roughed bloom；
Formula based on calculating soaking temperature T is pressed:
T=(1155-1450 × b) DEG C (1)；
Calculate H1Based on formula press:
H1=0.065 × Th- 1500 × b-20 (2)；
In formula (1) and (2), ThFor start rolling temperature per pass, unit DEG C；B is boron element in boronated stainless steel slab
Mass percent, unit %；
(3) by after roughed bloom milling, the double V-groove for welding is opened up in the outer of top surface and/or bottom surface, then through oil removing
After drying process, composite billet monomer is made；By the identical composite billet monomer stacked on top of 2~3 sizes and it is aligned, adjacent two
The double V-groove opened up on a composite billet monomer is opposite, is subsequently placed under vacuum degree≤2.0Pa vacuum condition, at double V-groove
Two neighboring composite billet monomer is welded, composite billet is made；
(4) end face on the end face of the rear and front end of composite billet respectively with a common carbon steel board is welded and fixed together,
The width of common carbon steel board and composite billet it is of same size, the thickness of common carbon steel board and the thickness of composite billet are identical, and composite slab is made
Material；
(5) 60~150min is kept the temperature after combination blank being heated to 1100~1150 DEG C, then carries out multistage hot deformation, eventually
900~1000 DEG C of temperature are rolled, draught per pass △ h2Meet 12mm≤△ h2≤H2Mm obtains the hot rolling of 20~80mm of thickness
Plate；
Calculate H2Based on formula press:
H2=0.07 × Th- 1500 × b-25 (3)；
In formula (3), ThFor start rolling temperature per pass, unit DEG C；B is that boron element quality contains in boronated stainless steel slab
Amount, unit %；
(6) then hot rolled plate rear and front end is consolidated because the straight carbon steel end cut that welding common carbon steel board is formed removes
Molten processing, is made that plasticity and toughness are excellent to be contained by 950~1100 DEG C of solid solution temperature, 60~150min of time, then be air-cooled to room temperature
Boron stainless steel thick plate.
In above-mentioned step (2), compression ratio >=2 of roughing；Compression ratio calculation formula is Hp/Hb, wherein HpIt is stainless for boracic
The thickness of steel slab, HbFor the thickness of roughed bloom.
In above-mentioned step (3), milling to surface roughness Ra≤0.8 μm.
In above-mentioned step (3), double V-groove 3~5mm of depth, 30~45 ° of angle.
In above-mentioned step (3), width-thickness ratio >=1.2 of composite billet.
In above-mentioned step (4), the length of common carbon steel board is 3~5 times of thickness.
In above-mentioned step (4), the straight carbon steel of mass percent < 0.25% of the selection C of straight carbon steel.
In above-mentioned step (5), compression ratio >=6+200 × b is accumulated；Accumulation compression ratio calculation formula is Hp×n/Hf, wherein
HbFor the thickness of boronated stainless steel slab, n is the number of plies (number 2~3 of the composite billet monomer used) of composite billet, HfFor heat
Roll the thickness of plate；B is boron element mass content in boronated stainless steel slab, unit %.
The principle of the invention lies in: in order to avoid forming complicated carbon boride in slab, to boronated stainless steel into
The control of row Ultra-low carbon；In order to eliminate the casting stress of slab, reduces and be segregated and guarantee going on smoothly for roughing, needed before slab roughing
It carries out for a long time；And since the solidus temperature of stainless steel is mainly related with boron content, burning in order to prevent, different boracics
Stainless steel casting blank should be kept the temperature in different temperatures；It is split to guarantee that side does not occur for the blank after rolling, draught per pass is full
The specific formula of foot, and control finishing temperature；Vacuum welding is carried out under conditions of vacuum degree≤2.0Pa, forms uninterrupted weldering
Seam, can prevent composite billet monomer combination interface from aoxidizing in welding, heating and the operation of rolling；Straight carbon steel is welded at both ends, is prevented
Only composite blank is during the rolling process since the inhomogeneous deformation of thickness direction causes to be layered；In order to guarantee that composite blank can have
Effect, which combines and side will not occur, to be split, and controls hot rolling per pass；Solution treatment can eliminate the residual stress of compound hot rolled plate, simultaneously
Guarantee that its room temperature texture is more uniform, stablizes.
In addition, control roughing compression ratio is to further make boride homogenization and imperceptibility in slab；To its carry out
Surface finish work later cleans finishing rear surface, deoils, guarantee contact surface to surface roughness Ra≤0.8 μm
Flatness and cleanliness, so that boronated stainless steel composite blank can effectively combine in subsequent course of hot rolling；In order to protect
Weld strength is demonstrate,proved, the double V-groove size of processing is selected；The straight carbon steel of welding is too short, and blank rolling is easy to fall off when biting, and loses
Restriction effect, too long it will cause the wastes of raw material, it is therefore desirable to control the slenderness ratio of straight carbon steel；In order to guarantee in composite blank
Boride is sufficiently made fine and homogenizes distribution, and compression ratio is accumulated in control hot rolling.
Boronated stainless steel slab provided by the present invention not only realizes effective combination of layers of material: three-point bending, drawing
It stretches and impacts etc. in deformation processes, the situations such as layering, cracking do not occur for combination interface；And realize boride distribution uniformity
With the control of size dispersion.Uniformly tiny boride not only increases the homogeneous deformation ability of production board, and sufficiently sends out
The dispersion-strengthened action of second phase particles is waved, final prepared boronated stainless steel slab has excellent plasticity and toughness.
Compared with prior art, present invention process is realized by the accumulation compression ratio of raising boronated stainless steel slab
The homogenization of boride, imperceptibility control, effectively improve the performance of boronated stainless steel slab in product plate；By effectively controlling knot
The technological parameter for closing the processes such as interface finishing, vacuum welding, roughing and composite rolling, ensure that each layer boronated stainless steel plate energy
It effectively combines, and improves the template of boronated stainless steel slab and degree is split on side, effectively increase boronated stainless steel slab
Lumber recovery；In addition, present invention process production procedure is compact, it is easy to implement mechanization and automation, production energy can be significantly reduced
Consumption and cost.
Detailed description of the invention
Fig. 1 be step (3) in the preparation method embodiment 1 of the excellent boronated stainless steel slab of plasticity and toughness of the invention~
(5) part flow diagram；In figure, 1, roughed bloom, 2, groove, 3, weld seam, 4, common carbon steel board, 5, hot-rolling mill roll；
Fig. 2 is outer after the excellent boronated stainless steel slab three point bending test of the plasticity and toughness of the embodiment of the present invention 1 fails
See pattern photo figure；In figure, 1, crackle, 2, combination interface region；
Fig. 3 is outer after the excellent boronated stainless steel slab three point bending test of the plasticity and toughness of the embodiment of the present invention 2 fails
See pattern photo figure；In figure, 1, crackle, 2, combination interface region；
Fig. 4 is the boronated stainless steel hot rolling blank appearance photo figure of comparative example 2 of the present invention.
Specific embodiment
Roughed bloom prepared by the present invention is flawless roughed bloom.
Hot rolled plate prepared by the present invention is flawless hot rolled plate.
Hot rolled plate rear and front end of the invention refers to the both ends on hot rolled plate length direction.
565~690MPa of tensile strength of the excellent boronated stainless steel slab of plasticity and toughness in the embodiment of the present invention, room temperature
Elongation percentage 19~42%, 220~530KJ/m of room temperature impact toughness2。
The boride of partial size≤3.0 μm accounts for whole boron in the excellent boronated stainless steel slab of plasticity and toughness in the embodiment of the present invention
Compound gross mass 22~31%, the boride of partial size >=15.0 μm account for whole boride gross masses 2.9~4.2%.
The equipment that observation microscopic structure uses in the embodiment of the present invention is Olympus BX53M type metallographic microscope and JEOL
JXA-8530F type electron probe；
Room temperature tensile specimen size and its performance measurement method are to be dependent on GB/T228-2002 in the embodiment of the present invention, institute
The equipment used is Instron4206-006 tensile testing machine.
Room temperature Charpy-V mouthfuls of impact specimen size and its performance measurement method are to be dependent on GB- in the embodiment of the present invention
T229-2007, used equipment are ZBC2452-B Charpy impact machine tester.
Room temperature Three Points Bending Specimen size and its performance measurement method are according to GB T 232- in the embodiment of the present invention
2010, used equipment is Instron4206-006 tensile testing machine.
Below with reference to embodiment, the present invention is described in further detail, embodiments of the present invention are not limited thereto.
The straight carbon steel of mass percent < 0.25% of the selection C of straight carbon steel in the embodiment of the present invention.
Embodiment 1
Then boronated stainless steel slab is made by molding or continuous casting in molten steel by smelting molten steel；Boronated stainless steel slab
With a thickness of 160mm, ingredient contains Cr 18.5%, Ni 14.6%, Mn 0.7%, B 1.25%, Si by mass percentage
0.011 % of 0.31%, C, remaining is Fe and inevitable impurity element；
Boronated stainless steel slab is put into heating furnace and is warming up to soaking temperature T with furnace, and keeps the temperature 120min, is then carried out more
Passage roughing, roughing finishing temperature are 940 DEG C, draught per pass △ h1Meet 10mm≤△ h1≤H1Mm obtains thickness 65mm
Roughed bloom；
T=(1155-1450 × 1.25%)=1137 DEG C；
H when the first passage roughing1=0.065 × 1137-1500 × 1.25%-20=74-39=35mm；
The compression ratio 160/65=2.46 of roughing；
After roughed bloom milling to surface roughness Ra≤0.8 μm, open up in the outer of top surface and/or bottom surface for welding
Double V-groove, then through oil removing and be dried after, composite billet monomer is made；By heap above and below the identical composite billet monomer of 2 sizes
It folds and is aligned, the double V-groove opened up on two neighboring composite billet monomer is opposite, is subsequently placed in vacuum degree≤2.0Pa vacuum item
Under part, two neighboring composite billet monomer is welded at double V-groove, composite billet is made；Wherein double V-groove depth 4mm, angle
45°；The width 175mm of composite billet, thickness 130mm, width-thickness ratio 1.35；
End face on the end face of the rear and front end of composite billet respectively with a common carbon steel board is welded and fixed together, general carbon
The width of steel plate and composite billet it is of same size, the thickness of common carbon steel board and the thickness of composite billet are identical, and combination blank is made；It is general
The length 450mm of carbon steel sheet is 3.46 times of thickness；
It is heated to combination blank to keep the temperature 120min after 1140 DEG C, then carries out multistage hot deformation, 930 DEG C of finishing temperature,
Draught per pass △ h2Meet 12mm≤△ h2≤H2Mm obtains the hot rolled plate of thickness 30mm；
H when the first passage hot rolling2=0.07 × 1140-1500 × 1.25%-25=79.8-18.8-25=36mm；
Accumulate 160 × 2/36=10.67 of compression ratio >=6+200 × 1.25%=8.5；
The process of above-mentioned part steps is as shown in Figure 1；
The straight carbon steel end cut removal that hot rolled plate rear and front end is formed by welding common carbon steel board, then carries out at solid solution
Reason, 1100 DEG C of solid solution temperature, time 90min, then it is air-cooled to room temperature, the excellent boronated stainless steel slab of plasticity and toughness is made,
Thickness 30mm, tensile strength 610MPa, room temperature elongation percentage 24%, room temperature impact toughness 290KJ/m2；
In the excellent boronated stainless steel slab of plasticity and toughness, the boride of partial size≤3.0 μm accounts for whole boride gross masses
24%, the boride of partial size >=15.0 μm accounts for whole boride gross masses 3.8%；
It takes in combination interface region and is detected with a thickness of the Three Points Bending Specimen of 5.0mm, the pattern after sample failure is such as
Shown in Fig. 2；In the deformation processes such as stretching and impact, the situations such as layering, cracking do not occur for combination interface region 2；Combination interface energy
It effectively combines, and bond strength is higher
Embodiment 2
With embodiment 1, difference is method:
(1) boronated stainless steel slab with a thickness of 220mm, ingredient contains Cr 18.2%, Ni 13.4% by mass percentage,
Mn 1.15%, B 0.65%, Si 0.23%, C 0.013%；
(2) boronated stainless steel slab is put into heating furnace and is warming up to soaking temperature T with furnace, and keep the temperature 120min, then into
Row multi-pass roughing, roughing finishing temperature are 925 DEG C, obtain thickness 60mm roughed bloom；
T=(1155-1450 × 0.65%)=1146 DEG C；
H when the first passage roughing1=0.065 × 1146-1500 × 0.65%-20=74.5-9.8-20=
44.7mm；
The compression ratio 3.67 of roughing；
(3) 3 composite billet monomers are stacked into vacuum welding and composite billet is made；Double V-groove depth 4mm, 40 ° of angle；It is compound
The width 360mm of base, thickness 180mm, width-thickness ratio 2；
(4) the length 550mm of common carbon steel board is 3.1 times of thickness；
(5) it is heated to combination blank to keep the temperature 120min after 1150 DEG C, then carries out multistage hot deformation, finishing temperature 955
DEG C, obtain the hot rolled plate of thickness 75mm；
H when the first passage hot rolling2=0.07 × Th- 1500 × b-25；
Accumulate compression ratio=220 × 3/75=8.8 >=6+200 × 0.65%=7.4；
(6) 1000 DEG C of solid solution temperature, time 120min；The excellent boronated stainless steel plank thickness 75mm of plasticity and toughness,
Tensile strength 565MPa, room temperature elongation percentage 42%, room temperature impact toughness 530KJ/m2, the boride of partial size≤3.0 μm accounts for whole
Boride gross mass 31%, the boride of partial size >=15.0 μm account for whole boride gross masses 2.9%；
It takes in combination interface region and is detected with a thickness of the Three Points Bending Specimen of 5.0mm, the pattern after sample failure is such as
Shown in Fig. 3, when sample buckling failure, layering, cracking do not occur for combination interface region 2, after illustrating boronated stainless steel plate hot rolling,
Combination interface can be combined effectively, and bond strength is higher.
Embodiment 3
With embodiment 1, difference is method:
(1) boronated stainless steel slab with a thickness of 110mm, ingredient contains Cr 19.4%, Ni by mass percentage
14.76%, Mn 0.61%, B 1.47%, Si 0.19%, C 0.009%；
(2) boronated stainless steel slab is put into heating furnace and is warming up to soaking temperature T with furnace, and keep the temperature 95min, then carried out
Multi-pass roughing, roughing finishing temperature are 935 DEG C, obtain thickness 50mm roughed bloom；
T=(1155-1450 × 1.47%)=1134 DEG C；
H when the first passage roughing1=0.065 × 1134-1500 × 1.47%-20=73.7-22.1-20=
31.6mm；
The compression ratio 2.2 of roughing；
(3) 2 composite billet monomers are stacked into vacuum welding and composite billet is made；Double V-groove depth 4.5mm, 45 ° of angle；It is multiple
Close the width 400mm of base, thickness 100mm, width-thickness ratio 4；
(4) the length 500mm of common carbon steel board is 5 times of thickness；
(5) it is heated to combination blank to keep the temperature 100min after 1130 DEG C, then carries out multistage hot deformation, finishing temperature 920
DEG C, obtain the hot rolled plate of thickness 20mm；
H when the first passage hot rolling2=0.07 × 1130-1500 × 1.47%-25=79.1-22.1-25=32mm；
Accumulate compression ratio=110 × 2/20=11 >=6+200 × 1.47%=8.9；
(6) 950 DEG C of solid solution temperature, time 90min；The excellent boronated stainless steel plank thickness 20mm of plasticity and toughness resists
Tensile strength 690MPa, room temperature elongation percentage 19%, room temperature impact toughness 220KJ/m2, the boride of partial size≤3.0 μm accounts for whole boron
Compound gross mass 22%, the boride of partial size >=15.0 μm account for whole boride gross masses 4.2%；
It takes in combination interface region and is detected with a thickness of the Three Points Bending Specimen of 5.0mm, when sample buckling failure, in conjunction with
Layering, cracking do not occur for interface zone.
Comparative example 1
With embodiment 1, difference is method:
Slab roughing finishing temperature is 985 DEG C, obtains the boundless roughed bloom split of 90mm, and roughing compression ratio (i.e. will for 1.78
Compression ratio reduces)；
Composite blank is heated to 1140 DEG C and keeps the temperature 120min, then carries out hot rolling, finishing temperature is 910 DEG C, per pass
Secondary drafts △ h2With embodiment 1, the thick boundless hot rolled plate split of 60mm is obtained, and accumulating compression ratio is 5.33 (accumulation compression ratios
It reduces)；
It takes in combination interface region and is detected with a thickness of the Three Points Bending Specimen of 5.0mm, since roughing compression is smaller,
Boride size is still more coarse in roughed bloom, and is unevenly distributed, and affects the combination effect of composite blank；Therefore, three
After point bend specimen failure, combination interface partial region is layered；In the deformation processes such as stretching and impact, combination interface part
The situations such as layering, cracking also occur for region；Since accumulation compression is relatively low, boride of the partial size less than 3.0 μm is accounted in production board
Than being only 17.5%, boride accounting of the partial size greater than 15.0 μm is 7.8%；Final prepared boronated stainless steel slab resists
Tensile strength is~640MPa, and room temperature elongation percentage is~16.7%, and room temperature impact toughness is~165KJ/m2。
Comparative example 2
With embodiment 1, difference is method:
Welding assembly is carried out under the vacuum condition of vacuum degree < 2.0Pa, obtains the two-layer compound blank that width is 175mm
Afterwards；Straight carbon steel is not respectively welded at the both ends of composite blank；
After composite blank heating, heat preservation, during hot rolling deformation, second passage just falls off when biting, and boracic is stainless
Steel hot rolling blank appearance as shown in figure 4, be layered, cannot effectively in conjunction with and continue to roll.
Comparative example 3
With embodiment 3, difference is method:
The ingredient of boronated stainless steel slab is by mass percentage are as follows: Cr 19.1%, Ni 13.5%, Mn 1.78%, B
1.61%, Si 0.13%, C 0.015%；Remaining is that Fe and inevitable impurity element (improve the boron in stainless steel
Content)；
It is 945 DEG C by slab roughing finishing temperature, draught per pass △ h1For 20mm, since boron content B% is excessively high, and
And draught per pass is excessive, obtained 50mm roughed bloom occurs obvious side and splits；Composite blank heating, heat preservation, hot rolling are become
After shape, the edge of the obtained compound hot rolled plate for being 11 with a thickness of 20mm, accumulation compression ratio slightly cracks；
After the solution treatment of 950 DEG C × 90min, boronated stainless steel slab is obtained；Since boron content B% is excessively high, slab
In boride not only quantity is more, but also size is more coarse；After roughing deforms the coarse boride accounting of size still compared with
Height affects the combination effect of composite blank, and therefore, after Three Points Bending Specimen failure, combination interface partial region is layered；
In the deformation processes such as stretching and impact, the situations such as layering, cracking also occur for combination interface partial region；Partial size is less than in production board
3.0 μm of boride accounting is 14.5%, and boride accounting of the partial size greater than 15.0 μm is 6.5%；Final prepared boracic
The tensile strength of stainless steel thick plate is~715MPa, and room temperature elongation percentage is~13.3%, and room temperature impact toughness is~153KJ/m2。
Claims (9)
1. a kind of boronated stainless steel slab that plasticity and toughness are excellent, it is characterised in that ingredient contain by mass percentage Cr 18.0~
20.0%, Ni 12.0~15.0%, Mn 0.2~2.0%, B 0.5~1.5%, Si < 0.5%, C < 0.02%, remaining is
Fe and inevitable impurity element；20~80mm of its thickness, tensile strength >=550MPa, room temperature elongation percentage >=18%, room temperature
Impact flexibility >=200KJ/m2。
2. a kind of excellent boronated stainless steel slab of plasticity and toughness according to claim 1, it is characterised in that grain in its tissue
The boride of diameter≤3.0 μm accounts for whole 20% or more boride gross masses, and the boride of partial size >=15.0 μm accounts for whole borides
Below gross mass 5%.
3. a kind of preparation method for the boronated stainless steel slab that plasticity and toughness are excellent, it is characterised in that sequentially include the following steps:
(1) then boronated stainless steel slab is made by molding or continuous casting in molten steel by smelting molten steel；The thickness of boronated stainless steel slab
Degree is 100~250mm, and ingredient contains Cr 18.0~20.0% by mass percentage, Ni 12.0~15.0%, Mn 0.2~
2.0%, B 0.5~1.5%, Si≤0.5%, C≤0.02%, remaining is Fe and inevitable impurity element；
(2) boronated stainless steel slab is put into heating furnace and is warming up to soaking temperature T with furnace, and keep the temperature 90~150min, then into
Row multi-pass roughing, roughing finishing temperature are 900~1000 DEG C, draught per pass △ h1Meet 10mm≤△ h1≤H1Mm is obtained
To thickness 30~80mm roughed bloom；
Formula based on calculating soaking temperature T is pressed:
T=(1155-1450 × b) DEG C (1)；
Calculate H1Based on formula press:
H1=0.065 × Th- 1500 × b-20 (2)；
In formula (1) and (2), ThFor start rolling temperature per pass, unit DEG C；B is boron element quality hundred in boronated stainless steel slab
Score, unit %；
(3) by after roughed bloom milling, the double V-groove for welding is opened up in the outer of top surface and/or bottom surface, then through oil removing and do
After dry processing, composite billet monomer is made；By the identical composite billet monomer stacked on top of 2~3 sizes and it is aligned, it is two neighboring multiple
It is opposite to close the double V-groove opened up on base monomer, is subsequently placed under vacuum degree≤2.0Pa vacuum condition, by phase at double V-groove
Adjacent two composite billet monomers welding, is made composite billet；
(4) end face on the end face of the rear and front end of composite billet respectively with a common carbon steel board is welded and fixed together, general carbon
The width of steel plate and composite billet it is of same size, the thickness of common carbon steel board and the thickness of composite billet are identical, and combination blank is made；
(5) 60~150min is kept the temperature after combination blank being heated to 1100~1150 DEG C, then carries out multistage hot deformation, finish to gauge temperature
900~1000 DEG C of degree, draught per pass △ h2Meet 12mm≤△ h2≤H2Mm obtains the hot rolled plate of 20~80mm of thickness；
Calculate H2Based on formula press:
H2=0.07 × Th- 1500 × b-25 (3)；
In formula (3), ThFor start rolling temperature per pass, unit DEG C；B is boron element mass content in boronated stainless steel slab, single
Position %；
(6) then hot rolled plate rear and front end is carried out at solid solution because the straight carbon steel end cut that welding common carbon steel board is formed removes
Reason, 950~1100 DEG C of solid solution temperature, 60~150min of time, then it is air-cooled to room temperature, the excellent boracic of plasticity and toughness is made not
Become rusty steel thick plate.
4. a kind of preparation method of the excellent boronated stainless steel slab of plasticity and toughness according to claim 3, it is characterised in that
In step (2), compression ratio >=2 of roughing.
5. a kind of preparation method of the excellent boronated stainless steel slab of plasticity and toughness according to claim 3, it is characterised in that
In step (3), milling to surface roughness Ra≤0.8 μm.
6. a kind of preparation method of the excellent boronated stainless steel slab of plasticity and toughness according to claim 3, it is characterised in that
In step (3), double V-groove 3~5mm of depth, 30~45 ° of angle.
7. a kind of preparation method of the excellent boronated stainless steel slab of plasticity and toughness according to claim 3, it is characterised in that
In step (3), width-thickness ratio >=1.2 of composite billet.
8. a kind of preparation method of the excellent boronated stainless steel slab of plasticity and toughness according to claim 3, it is characterised in that
In step (4), the length of common carbon steel board is 3~5 times of thickness.
9. a kind of preparation method of the excellent boronated stainless steel slab of plasticity and toughness according to claim 3, it is characterised in that
Accumulation compression ratio >=6+200 × b in step (5), after the completion of hot rolling.
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