CN105839003A - Normalized-condition delivered 180-200mm-thick EH36 steel plate and preparation method thereof - Google Patents
Normalized-condition delivered 180-200mm-thick EH36 steel plate and preparation method thereof Download PDFInfo
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- CN105839003A CN105839003A CN201610374131.5A CN201610374131A CN105839003A CN 105839003 A CN105839003 A CN 105839003A CN 201610374131 A CN201610374131 A CN 201610374131A CN 105839003 A CN105839003 A CN 105839003A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- 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
- C21D1/28—Normalising
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- 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
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- 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
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- 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
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- 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
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Abstract
The invention relates to a normalized-condition delivered 180-200mm-thick EH36 steel plate and a preparation method thereof. Chemical components of the steel plate are based on the national standards GB712 or the classification society rule, wherein Al is utilized to substitute an element Ti while V with relatively high content is added. The preparation method comprises the following steps: electric furnace smelting, LF refining, VD refining, die casting, steel ingot heating, break-down rolling, controlled slow cooling, steel billet heating, rolling, normalizing treatment and the like, which are sequentially carried out. The obtained steel plate does not have an obvious gradient structure in a thickness direction, and the structure of the steel plate is mainly a mixed mixture which comprises ferrite pearlite supplemented by little bainite. A microscopic structure is fine and uniform, an average crystal size is 8-12 mum, yield strength ranges from 380 MPa to 430 MPa, tensile strength ranges from 550 MPa to 600 MPa, and ductility is proper. The steel plate has an impact toughness value greater than or equal to 60 J at a temperature of 40 DEG C at a 1/4 part and a 1/2 part, and has excellent comprehensive mechanical property.
Description
Technical field
The invention belongs to field of steel metallurgy, be specifically related to the special thick 180～200mm EH36 steel of a kind of normalizing state delivery
And production method.
Background technology
At present, relating to the safety that ocean is run, Hai Gong enterprise is for the 180～200mm such key positions of EH36
Special heavy plate is still taked based on external introduction.Main cause be domestic possess produce 180～200mm super-thick steel plates enterprise extremely
Minority.For the EH36 steel plate for ocean engineering of high-level normalizing state delivery, domestic technique under-reserve.
At present, the production of ocean engineering high strength special heavy plate is primarily present two big difficult points: one, weld and low for meeting
The requirement of temperature toughness, it is necessary to ensure that the composition design of low-carbon-equivalent, it is therefore necessary to the super thick slab of supporting high homogenizing or steel ingot
Deng.Improve compression ratio, it is ensured that armor plate strength.Two, the product of more than 150mm thickness can be followed without applicable codes and standards.The whole world
In general nine classification societies of state eight state's specifications specify the maximum gauge of involved steel plate be 100mm, Norske Veritas (DNV) is the thickest is
150mm, the maximum gauge of standard GB/T 712～2011 correspondence is 150mm.In nine classification society rule of state and national standards
In GB712, for the production of EH36 grade of steel mainly with conditions of delivery such as controlled rolling, TMCP, hot rolling, normalizing rolling, normalizings.Currently,
Sea work ship enterprise still designs based on the composition being applicable to 6～100mm or 6～150mm product specification and requires to produce 180
～the EH36 steel plate of 200mm, i.e. on the premise of not changing alloying component (guarantee low-carbon-equivalent) and the condition of delivery, buying spy
The high-strength homogeneous steel plate of thick series.
It is an object of the invention to the most additionally increasing precious alloy, still using low-carbon-equivalent chemical composition to ensure welded steel
On the premise of performance, still take normalizing to produce, for the EH36 steel plate of greater thicknesses, redesign Plate Production technique, it is ensured that
The structural homogenity of the special heavy plate produced.
Summary of the invention
It is an object of the invention to provide 180～200mm spy's thickness EH36 of the delivery of a kind of normalizing state for above-mentioned prior art
The preparation method of steel plate.The steel ingot that selection >=900mm is thick, steel ingot rolls into intermediate blank through cogging, the thickness of intermediate blank and finished steel
Compression ratio be 2.0～2.5, intermediate blank is rolled to finished product thickness through controlled rolling again, uses the mode of production of steel ingot cogging+controlled rolling, phase
When in blank has been carried out twice austenite recrystallization, it is ensured that final big thickness steel plate end properties is in a thickness direction
Homogeneity, has specifically ensured that the performance at 1/2 thickness.The present invention is from blank to finished steel, and compression ratio >=4.5, the method is real
Show and be applicable to the standard analysis of general thickness EH36 and stand good the present invention.
The present invention solves the technical scheme that the problems referred to above are used: 180～200mm thickness EH36 of a kind of normalizing state delivery
Steel plate, the chemical composition of this steel plate is based on standard GB/T 712 or classification society rule, utilizes Al to substitute micro element Ti to prevent
Ti is compound with other element such as Nb, O, N to be separated out；Addition element V is beneficial to special heavy plate and expands hydrogen control, by weight percentage chemistry
Composition is: C:0.11～0.18%, Si:0.15～0.50%, Mn:1.30～1.60%, P :≤0.0070%, S :≤0.0030%,
Nb:0.010～0.050%, V:0.030～0.080%, Al:0.050～0.070%, Ni:0.10～0.40%, Cr:0.10～
0.20%, surplus is Fe and inevitable impurity element.
Preferably, the chemical composition of steel plate is C:0.17% by weight percentage, Si:0.25%, Mn:1.55%, P :≤
0.0060%, S :≤0.0020%, Nb:0.035%, V:0.065%, Al:0.060%, Ni:0.30%, Cr:0.15%, surplus is Fe
And inevitable impurity element.
There is not obvious gradient structure at thickness direction in steel plate, it is main a small amount of shellfish that steel plate is organized as ferritic-pearlitic
Family name's body is auxiliary mixing tissue, and average grain size is 8～12 μm.Yield strength transverse tensile property is 380～430MPa, anti-
Tensile strength 550～600MPa, elongation percentage >=21%, the steel plate-40 DEG C of notched bar impact strength >=60 at 1/4 thickness, at 1/2 thickness
J。
The design principle of composition of steel of the present invention is:
The addition of C can increase the quenching degree of steel, particularly Heavy Plate Production, can significantly improve the intensity of normalized steel, but C
Content is too much unfavorable for the ultralow temperature impact performance of steel, low temperature strain-aging performance, welding performance and corrosion resisting property, so this
In invention, carbon content control is low-carbon (LC) control, between 0.11～0.18%.
Si is mainly used in deoxidation, though to determine its addition according to different smelting modes, but to obtain good steel
Plate performance, it is necessary to more than 0.15%, if but the segregation of heart portion can be caused again more than more than 0.50% and destroy welding performance, so
Specify that its upper limit is 0.50%.
Mn has the postponement austenite effect to ferritic transformation in described steel, to fining ferrite, improve intensity and
Toughness is favourable.When the content of manganese is relatively low, above-mentioned effect is notable, and armor plate strength and toughness are on the low side etc..Too high, can cause again even
Strand segregation, poor toughness and solderability reduce, and classification society rule requires that the Fe content upper limit is 1.60% etc. simultaneously, therefore in the present invention
Comprehensive addition in view of alloy, it is stipulated that Fe content addition is in the range of 1.30～1.60%.
The solute effect of dragging of Nb and the Nb (C, the N) pinning effect to austenite grain boundary, all suppression deformed austeaite is again
Crystallization, expands between the non-recrystallization zone of austenite, reduces special heavy plate and produces time of staying temperature.And form precipitation when cooling or tempering
Thing, so that intensity and toughness are all improved, it is also possible to improve the corrosion resisting property of steel.When addition is less than 0.020%, effect is not
Substantially, during more than 0.050%, toughness reduces, and causes continuous casting billet to produce face crack.Therefore, present invention provide that content of niobium should be between
In the range of 0.020～0.050%.
V is the excellent deoxidizer of steel, is effective crystal grain thinning element, improves intensity and the toughness of steel.In normalized steel,
V belongs to precipitation strength element, is of value to slab simultaneously and expands hydrogen in annealing process.When addition is more than 0.080%, toughness reduces,
The center segregation of slab is notable.Therefore, present invention provide that content of niobium should be in the range of 0.030～0.080%.
Al is used to the nitrogen element in fixing steel, is the addition utilizing Ti that Al refinement substitutes micro element, with prevent Ti with
Other element such as Nb, O, N are compound to be separated out, and forms the hard Large Inclusions etc. of prismatic, causes impact property unstable.Meanwhile,
Al too high levels, is easily caused the blocking of crystallizer rising head, the large-scale formation containing Al oxide.In the present invention, it is stipulated that aluminum content is situated between
In 0.050～0.070%.
Ni is the element improving steel hardenability, is also the most frequently used element of the low-temperature flexibility being effectively improved steel.Additionally, and steel
Middle remaining Cr, P compound action, it will help the corrosion resistance of raising steel, but classification society rule's set upper limit 0.40%, in order to
Specify without departing from classification society rule.Therefore in the present invention, it is stipulated that nickel content is between 0.15～0.40%.
Cr is the element improving steel hardenability, it is possible to suppression polygonal ferrite and the formation of pearlite, promotes low temperature group
Knit the transformation of bainite or martensite, improve the intensity of steel.But Cr too high levels will affect the toughness of steel, and cause Temper brittleness
Property, classification society rule requires less than 0.20%.Therefore chromium content controls 0.10～0.20% in the present invention.
Though P can improve corrosion resistance, but can reduce low-temperature flexibility and hinder solderability, it is unsuitable to structural steel, this
Bright because being ingot smelting, it is stipulated that it controls below 0.0070%.
S forms MnS field trash, also results in center segregation, also has harmful effect to corrosion resistance, present invention provide that and controls at it
System is below 0.0030%.
The preparation method of 180～200mm thickness EH36 steel plates of above-mentioned normalizing state delivery, including following operation,
(1) smelting process:
Selecting high duty pig iron and steel scrap as raw materials for metallurgy, select high-quality steel-making supplementary material, raw material is successively through electric furnace smelting, LF essence
Refining, VD refine, molding, five big harmful residual control of elements: S≤0.0030%, P≤0.0070%, H≤0.00015%, O≤
0.0015%, N≤0.0050%；Guarantee that the field trash total rank of A, B, C, D class in steel plate finished product is below 3.0 grades；
In order to suppress steel ingot internal defect, segregation, the molten steel casting degree of superheat is 25～40 DEG C, and casting cycle uses omnidistance argon to protect
Protect, be cast into >=thick for 900mm cast slab；
After steel ingot is raised one's hat, band mould enters the slow cooling expansion hydrogen that burial pit is carried out 48～72 hours；
Carrying out removing surface after slow cooling, cleaning rear cutout is except Steel ingot feeder head；
(2) steel ingot cogging technique:
Steel ingot is heated in soaking pit 1230～1260 DEG C, and steel ingot temperature retention time is 10～15min/cm, through height after coming out of the stove
Setting-out de-scaling, then split rolling method becomes intermediate blank, the thickness of intermediate blank meet its compression ratio with finished product thickness between 2.0～
2.5；Intermediate blank after cogging rolls off the production line covering slow cooling more than 48 hours；
(3) rolling mill practice:
Intermediate blank is heated to 1180～1250 DEG C, and intermediate blank heat time heating time is 11～14min/cm, makes the alloying element in steel
Fully solid solution is to ensure composition and the uniformity of performance of final products.Steel billet come out of the stove after through high-pressure water descaling, then carry out thick
Roll+finish rolling two-stage control rolling: the start rolling temperature of roughing is 1050～1100 DEG C, use heavy reduction rolling, during rolling not
Carry out turning steel rolling, keep full axial rolling, to ensure that each passage is set reduction ratio by rolling maximum capacity as far as possible.After roughing
Three road single pass reduction ratios are 10～15%；The start rolling temperature of finish rolling is 850～920 DEG C, is rolled to finished product thickness, after finish rolling completes
Carrying out ACC and accelerate cooling, cooling red temperature is 630～700 DEG C；
(4) normalizing heat treatment technique:
After rolling, normalizing heat treatment made by steel plate, and normalizing temperature is 880～920 DEG C, and temperature retention time is 1.5～2.2min/mm.Specifically
Ground, using continuous oven is 880～920 DEG C to steel plate normalizing heat treatment, the normalizing temperature of continuous oven, and entering stove to the time of coming out of the stove is
1.6～2.2min/mm；Or use soaking pit to be 880-920 DEG C to steel plate normalizing heat treatment, soaking pit normalizing temperature, insulation
Time is 1.5～2.1min/mm.
The present invention has a characteristic that
The present invention is based on carbon manganese steel composition design principle, the most additionally increases the precious alloys such as Ni, Cu, saves cost of alloy.Carbon
Equivalent is low, still can mate the welding material of common EH36, welding procedure during welding.
The smelting molten steel method of the application has the advantage that residual elements are low, Cleanliness of Molten Steel is high, is applicable to other high
The production of standard spy's thickness steel grade.
The inventive method, is produced by steel ingot cogging+controlled rolling, relates at twice austenite recrystallization heat in the operation of rolling
Reason so that the original austenite grains in material is the most tiny.Cogging heating-up temperature has reached 1230-1260 DEG C, effectively
Improving the portion's segregation of the steel ingot heart, this is to ensure final special heavy plate finished product tissue, the important prerequisite of performance uniformity.Intermediate blank heats
Temperature is 1180-1250 DEG C, beneficially austenite recrystallization, meanwhile, when the reheating temperature of intermediate blank is unlike steel ingot cogging
Heating-up temperature is the highest, it is therefore an objective to be unlikely to roughening after guaranteeing austenite recrystallization.
Steel billet after rolling is processed by normalizing process, does not change the process program that classification society rule specifies to require, uses
Family is more easily accepted by.During the PROCESS FOR TREATMENT special heavy plates such as quenched, the NAC also overcoming prior art, on through-thickness, tissue gradient is relatively
Greatly, the shortcoming of poor performance etc..
The special thick EH36 ship steel produced under the conditions of the present invention has good obdurability, and steel plate does not exist bright at thickness direction
Aobvious gradient structure, steel plate tissue is main based on ferritic-pearlitic, and a small amount of bainite is auxiliary mixing tissue.Micro-group
Knitting fine uniform, being 8-12 μm with cut shot measuring steel plate average grain size.
Accompanying drawing explanation
Fig. 1 is the metallographic structure at the embodiment of the present invention 1 light plate 1/4 thickness, is main a small amount of shellfish for ferritic-pearlitic
Family name soma is auxiliary line and staff control；
Fig. 2 is the metallographic structure at the embodiment of the present invention 1 light plate 1/2 thickness, is main a small amount of bainite for ferritic-pearlitic
It is organized as auxiliary line and staff control.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
The preparation method of special thick EH36 steel:
(1) select high-quality steel scrap as raw materials for metallurgy, utilize high-quality steel-making supplementary material, smelt two stoves, 50 tons of every stove.Molten steel is successively
Through electric furnace smelting, LF refine, VD refine, stable state is cast into 4 steel ingots, and 25 tons of every steel ingot, the present invention uses 3 therein
Steel ingot is respectively as embodiment 1 to 3.Steel ingot section is more than 900mm, to ensure that the compression ratio with final products is more than 4.5.Control
The big harmful residual element of molten steel five: S≤0.0030%, P is 0.0070%, and H is 0.00012%, and O is 0.0010%, and N is 0.004%.
Fully float in view of field trash to be allowed and control steel ingot internal defect, the segregation requirement to the degree of superheat, in the 25-40 DEG C of degree of superheat
In the case of cast, casting uses omnidistance argon shield, is cast into >=thick for 900mm cast slab.After steel ingot is raised one's hat, band mould enters slow
Cold hole carries out slow cooling in 48-72 hour and expands hydrogen.Ingot conditioning surface after slow cooling, in the present embodiment, steel ingot is cleared up without band temperature, cleaning
Rear cutout removes Steel ingot feeder head.The smelting component of each embodiment correspondence steel ingot is as shown in table 1.
The table 1 embodiment ocean engineering chemical composition (wt%) of EH36 steel plate
| Embodiment | C | Si | Mn | P | S | Ni | Cr | Al | V | Nb |
| Embodiment 1,2 | 0.13 | 0.25 | 1.55 | 0.007 | 0.0020 | 0.35 | 0.15 | 0.055 | 0.065 | 0.035 |
| Embodiment 3 | 0.14 | 0.30 | 1.45 | 0.007 | 0.0015 | 0.30 | 0.10 | 0.065 | 0.070 | 0.044 |
(2) will after cleaning >=900mm steel ingot is heated to 1230-1260 DEG C in soaking pit, the Heating Steel Ingots time is 13min/
Cm, through high-pressure water descaling after coming out of the stove, then split rolling method becomes intermediate blank, it is ensured that workpiece thickness exists with the compression ratio of finished product thickness
2.0-2.5.After cogging, gained intermediate blank rolls off the production line, covering slow cooling about 48 hours, carries out under upper berth with the intermediate blank of other steel grade
Lid.
Intermediate blank being sent into walking beam furnace, is heated to 1180-1250 DEG C, intermediate blank heat time heating time is 11-14min/
Cm, makes the abundant solid solution of the alloying element in steel, it is ensured that the composition of final products and the uniformity of performance.Steel billet come out of the stove after through high pressure
Then water de-scaling carries out roughing+finish rolling two-stage control rolling: the start rolling temperature of roughing, between 1050-1100 DEG C, uses big pressure
Lower amount rolls, and does not carry out turning steel rolling, keep full axial rolling during rolling, it is ensured that each passage is carried out by rolling maximum capacity as much as possible
Set reduction ratio.The single pass reduction ratio in roughing Hou tri-road is 10-15%；Finish rolling start rolling temperature between 850-920 DEG C, finish rolling
To finished product thickness, sending ACC unit to be accelerated cooling, cooling red temperature is 630-700 DEG C.
(3) normalized treatment: selecting soaking pit to carry out normalized treatment, normalizing temperature controls as 890-910 DEG C, and temperature retention time is
2.0min/mm±5min。
Embodiment 1 to 3 is the special thick EH36 plate of 180-200mm, and the total rank of field trash A, B, C, D class controls 2.0.The most special
For slab, the performance of steel plate uniformity direct relation steel in a thickness direction, uniform tissue is that steel plate normally uses
And the safety assurance being on active service.
Performance at special thick EH36 plate 1/2 is detected by the present invention, and table 2, from the point of view of steel plate stretching performance, steel plate is surrendered
Intensity transverse tensile property is between 380～430MPa, and tensile strength is between 550～600MPa, and elongation percentage is moderate, all
More than GB712 requires.At steel plate 1/2 thickness, tensile property is slightly below at 1/4 thickness, but difference is little.Each embodiment steel plate
Low-temperature impact toughness as shown in table 3, notched bar impact strength >=60 J of at steel plate thickness 1/4, at 1/2-40 DEG C.
Table 2 various embodiments of the present invention tensile property
Table 3 various embodiments of the present invention impact property
In addition to the implementation, other embodiments, all employing equivalents or equivalence substitute mode have been present invention additionally comprises
The technical scheme formed, all should fall within the scope of the hereto appended claims.
Claims (6)
1. 180～200mm thickness EH36 steel plates of normalizing state delivery, it is characterised in that: the chemical composition of this steel plate be based on
Standard GB/T 712 or classification society rule, utilize Al to substitute micro element Ti to prevent the compound analysis of Ti and other element such as Nb, O, N
Go out；Addition element V is beneficial to special heavy plate and expands hydrogen control, and chemical composition by weight percentage is: C:0.11～0.18%, Si:
0.15～0.50%, Mn:1.30～1.60%, P :≤0.0070%, S :≤0.0030%, Nb:0.010～0.050%, V:0.030～
0.080%, Al:0.050～0.070%, Ni:0.10～0.40%, Cr:0.10～0.20%, surplus is Fe and the most miscellaneous
Prime element.
180～200mm thickness EH36 steel plates of normalizing state the most according to claim 1 delivery, it is characterised in that: this steel plate
Chemical composition is C:0.17% by weight percentage, Si:0.25%, Mn:1.55%, P :≤0.0060%, S :≤0.0020%, Nb:
0.035%, V:0.065%, Al:0.060%, Ni:0.30%, Cr:0.15%, surplus is Fe and inevitable impurity element.
3. a preparation method for 180～200mm thickness EH36 steel plates of normalizing state delivery, its feature described in claim 1 or 2
It is: include following operation,
(1) smelting process:
Selecting high duty pig iron and steel scrap as raw materials for metallurgy, select high-quality steel-making supplementary material, raw material is successively through electric furnace smelting, LF essence
Refining, VD refine, molding, five big harmful residual control of elements: S≤0.0030%, P≤0.0060%, H≤0.00015%, O≤
0.0015%, N≤0.0050%；Guarantee that the field trash total rank of A, B, C, D class in steel plate finished product is below 3.0 grades；
In order to suppress steel ingot internal defect, segregation, the molten steel casting degree of superheat is 25～40 DEG C, and casting cycle uses omnidistance argon to protect
Protect, be cast into >=thick for 900mm cast slab；
After steel ingot is raised one's hat, band mould enters the slow cooling expansion hydrogen that burial pit is carried out 48～72 hours；
Carrying out removing surface after slow cooling, cleaning rear cutout is except Steel ingot feeder head；
(2) steel ingot cogging technique:
Steel ingot is heated in soaking pit 1230～1260 DEG C, and steel ingot temperature retention time is 10～15min/cm, through height after coming out of the stove
Setting-out de-scaling, then split rolling method becomes intermediate blank, the thickness of intermediate blank meet its compression ratio with finished product thickness between 2.0～
2.5；Intermediate blank after cogging rolls off the production line covering slow cooling more than 48 hours；
(3) rolling mill practice:
Intermediate blank is heated to 1180～1250 DEG C, and intermediate blank heat time heating time is 11～14min/cm, steel billet come out of the stove after through high pressure
Water de-scaling, then carries out roughing+finish rolling two-stage control rolling: the start rolling temperature of roughing is 1050～1100 DEG C, uses big pressure
Lower amount rolls, and does not carry out turning steel rolling, keep full axial rolling during rolling, and after roughing, three road single pass reduction ratios are 10～15%；Finish rolling
Start rolling temperature be 850～920 DEG C, be rolled to finished product thickness, finish rolling carry out after completing ACC accelerate cooling, cooling red temperature be
630～700 DEG C；
(4) normalizing heat treatment technique:
After rolling, normalizing heat treatment made by steel plate, and normalizing temperature is 880～920 DEG C, and temperature retention time is 1.5～2.2min/mm.
180～200mm thickness EH36 steel plates of normalizing state the most according to claim 1 and 2 delivery, it is characterised in that: steel plate
There is not obvious gradient structure at thickness direction, steel plate be organized as ferritic-pearlitic be main a small amount of bainite be auxiliary mixed
And tissue, average grain size is 8～12 μm.
180～200mm thickness EH36 steel plates of normalizing state the most according to claim 1 and 2 delivery, it is characterised in that: surrender
Intensity transverse tensile property is 380～430MPa, tensile strength 550～600MPa, and elongation percentage >=21%, steel plate is at 1/4 thickness
-40 DEG C of notched bar impact strength >=60 J at place, 1/2 thickness.
The preparation method of 180～200mm thickness EH36 steel plates of normalizing state the most according to claim 3 delivery, its feature exists
In: using continuous oven is 880～920 DEG C to steel plate normalizing heat treatment, the normalizing temperature of continuous oven, and entering stove to the time of coming out of the stove is
1.6～2.2min/mm；Or use soaking pit to be 880-920 DEG C to steel plate normalizing heat treatment, soaking pit normalizing temperature, insulation
Time is 1.5～2.1min/mm.
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| CN201610374131.5A CN105839003B (en) | 2016-05-31 | 2016-05-31 | A kind of 180~200mm thickness EH36 steel plates of normalizing state delivery and preparation method thereof |
| PCT/CN2016/102366 WO2017206418A1 (en) | 2016-05-31 | 2016-10-18 | Normalized-condition delivered 180-200 mm-thick eh36 steel plate and preparation method therefor |
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| CN201610374131.5A CN105839003B (en) | 2016-05-31 | 2016-05-31 | A kind of 180~200mm thickness EH36 steel plates of normalizing state delivery and preparation method thereof |
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