CN106521314A - Completely-hardened high-toughness ultra-thick wear-resistant steel plate which is easy to weld, and production method thereof - Google Patents
Completely-hardened high-toughness ultra-thick wear-resistant steel plate which is easy to weld, and production method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
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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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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Abstract
The invention relates to a steel plate. Fe is taken as the base element of the steel plate; and the steel plate comprises, by mass, 0.11 to 0.15% if C, 0.20 to 0.40% of Si, 0.9 to 1.3% of Mn, P<=0.010%, S<=0.002%, 0.4 to 0.8% of Cr, 0.4 to 0.7% of Mo, 1.0 to 2.6% of Ni, 0.2 to 0.5% of Cu, 0.06 to 0.1% of Al, 0.03 to 0.06% of V, Nb<=0.04%, N<=0.006%, 0.001 to 0.002% of B, 0.0005 to 0.005 of Ca, Ca/S>=1, and Al>=(Mn/C)*(%N). A production method comprises following steps: KR molten iron pretreatment, converter steel making, LF refining, RH refining, continuous casting, covered slow cooling, control rolling, straightening, slow cooling, quenching, and tempering. The thickness of the obtained steel plate ranges from 110 to 180mm, carbon equivalent CEV is equal to or lower than 0.75%, Brinell hardness of the thickness cross section of the steel plate ranges from HBW320 to HBW400, and Charpy impact energy of the parts at 1/4 thickness and 1/2 thickness is larger than 60J at -40 DEG C.
Description
Technical field
The invention belongs to extraordinary iron and steel technical field, and in particular to a kind of wear-resisting steel plate of entire body hardening and its manufacturer
Method.
Background technology
Engineering and mining machine are frequently with the NM360's and HBW400 that surface Brinell hardness is HBW360 or so or so
NM400 steel plates carry out the wear-resisting part of manufacture requirements.China Patent Publication No. be CN104451409A, CN102747280B,
CN103014543A、CN103233171A、CN105002430A、CN101775543A、CN101880831A、CN103194674A
Invention disclose similar wear-resisting steel plate and manufacture method.But, the steel plate thickness of these invention manufactures is less（≤60mm）, no
Some heavy constructions and mining machine can be met to big thickness（≥80mm）The requirement of wear-resisting steel plate.China Patent Publication No. is
The invention of CN105603323A discloses surface of steel plate Brinell hardness for HBW320～HBW410,1/4 thickness of steel plate when -40 DEG C
Place's ballistic work>The wear-resisting steel plate and its manufacture method of 20J, the steel plate thickness for manufacturing accordingly is up to 120mm.But, with engineering
With the continuous increase of mining machine size and power, the high-ductility of " the entire body hardening " of the firmer and abrasion performance of bigger thickness is needed
Property easy-welding and wear-resistant steel plate is manufacturing matching wear parts（Such as sword plate）.That is, not only will expire in surface of steel plate
Sufficient hardness requirement and requirement must be also met on whole thickness section, that is, meet the requirement of " entire body hardening ".But, only
" entire body hardening " by steel plate does not ensure that the use longevity for making that part has firm, abrasion performance and length under complex working condition
Life, it be also required to steel plate on whole thickness section have high toughness combine could meet as require, i.e., in steel plate
1/4 and 1/2 thickness at all should have high impact flexibility.Contrast, the invention of CN105603323A relates only to steel plate
Case hardness but the hardness being not related on whole thickness section, that is, it is not related to " entire body hardening " performance；Relate only to steel plate
Impact flexibility at 1/4 thickness is not related to the impact flexibility at 1/2 thickness；It is only capable of manufacturing steel plate of the maximum gauge for 120mm
The steel plate of bigger thickness can not be manufactured；These factors limit it in the especially big Thickness Engineering of high tenacity for requiring " entire body hardening "
With mining machine wear parts（Such as sword plate）In use.
The content of the invention
It is an object of the invention to overcome above-mentioned deficiency, there is provided a kind of high tenacity of entire body hardening easily welds special thickness abrasion-resistant stee
Plate and its manufacture method, the manufacture thickness of steel plate is 110～180mm.
The present invention the adopted technical scheme that solves the above problems is：A kind of high tenacity of entire body hardening easily welds special thick resistance to
Mill steel plate, it is characterised in that：Steel plate element based on Fe, and the also chemical composition comprising following mass percent：C：
0.11～0.15%, Si：0.20～0.40%, Mn：0.9～1.3%, P：≤ 0.010%, S：≤ 0.002%, Cr：0.4～0.8%,
Mo：0.4～0.7%, Ni：1.0～2.6%, Cu：0.2～0.5%, Al：0.06～0.1%, V：0.03～0.06%, Nb：≤
0.04%, N：≤ 0.006%, B：0.001～0.002%, Ca：0.0005～0.005, and Ca/S >=1, Al >=(Mn/C) × (%
N), and inevitable impurity element；Carbon equivalent ce V（= C + Mn/6 + (Cr + Mo + V)/5 + (Cu + Ni)/
15）≤0.75%.
Steel plate thickness of the present invention be 110～180mm, carbon equivalent ce V≤0.75%, using continuous casting billet manufacture.Steel plate is whole
Brinell hardness on thickness x cross sectional is HBW320～HBW400, and -40 DEG C of Charpy-V impact power is equal at the steel plate 1/4 and 1/2 thickness>
60J。
Hereinafter the effect of contained component and consumption in the present invention are selected to illustrate：
C：Element necessary to steel plate wearability is to ensure that, the carbon content improved in steel will increase its martensite transfor mation energy
Power, so as to improve its hardness and intensity, and then improves wearability.But too high C contents are unfavorable to the toughness of steel, can also drop
Low welding performance.In addition, too high C contents also result in serious center C segregations so as to affect the core toughness of steel plate.This
Invention controls its content for 0.11～0.15%.
Si：It is the deoxidant element in steel, and the hardness and intensity of steel is improved with solution strengthening form.It reduces C in ferrum element
Diffusion velocity in body make the carbide separated out during tempering be difficult aggregation, increase steel belt roof bolt stability, make wear-resisting steel plate compared with
The internal stress that low temperature can be reduced in material when being tempered also makes the high hardness of its holding.In addition, during Si reduction frictional heatings
Oxidation and the flow harden rate of steel is improved so as to improving the wearability of material.But, when Si contents are higher, steel plate is tough
Property and welding performance reduce.The present invention controls Si contents for 0.20～0.40%.
Mn：It is the element for improving steel hardenability, and plays solution strengthening effect to make up in steel because C contents reduce what is caused
Hardness and loss of strength.When in steel, Mn contents are less than 0.8%, it is impossible to which give full play to hardness and intensity guarantees effect.But it is too high
Mn contents can then increase the carbon equivalent of steel and grain coarsening is made so as to damage its welding performance, also and to increase temper brittleness sensitive
The tendency of property.Additionally, center segregation and crackle occurs in higher Mn in being easily caused strand, the toughness of steel plate core is reduced.This
Invention Mn contents are controlled to 0.9～1.3%.
Ni：It is the element for improving the quenching degree of steel plate and significantly improving its low-temperature flexibility, On Impact Toughness and ductile-brittle transiton
Temperature has desirable influence.But during Ni too high levels, surface of steel plate easily generates the higher iron scale of stickiness, it is difficult to remove, shadow
Ring the surface quality of steel plate.In addition, Ni is also precious metal, too high levels can increase cost.The present invention controls its content and exists
1.0～2.6%, be conducive to the cost performance being optimal.
Cr：It is to improve quenching degree, increase temper resistance and contribute to the element that the hardness of steel, intensity are improved.Contain in C
In the case that amount is relatively low, adds appropriate Cr and can ensure that steel plate reaches required hardness and intensity.Cr can also be significantly improved
The antioxidation and decay resistance of steel, reduces mining machine and contains Cl in colliery, iron mine environmental work-Ionic liquid and slurry
Corrosion, extends its service life.If but excessive addition, the toughness of steel is reduced while also reducing the welding performance of steel, this
Invention controls its content 0.4～0.8%.
Mo：The quenching degree of steel is significantly improved so that steel easily forms martensite in quenching.Steel after quenching is in lower temperature
When scope is tempered, Mo is mainly present in steel with solution, plays solid solution strengthening effect.Add in low-alloy steel a certain amount of
Mo can improve its hardness and intensity without deteriorating its low temperature impact properties, but Mo is precious metal, and too high levels can increase
Cost also reduces the welding performance of material simultaneously.In the present invention, the content of Mo is controlled 0.4～0.7%.
Cu：The quenching degree and atmospheric corrosion resistance of steel plate can be improved, the hydrogen induced cracking sensitivity of steel is reduced.But it is too high
Cu contents are unfavorable for the welding performance of steel plate, and are also easy to produce copper brittleness phenomenon, deteriorate the surface property of steel plate.Present invention control
Its content is made for 0.2～0.5%.
V：It is the element of crystal grain thinning, and makes V (C, N) disperse educts and significantly improve the unit of the hardness and intensity of steel
Element.If but adding too much, will reduce the toughness and welding performance of material, the present invention control its content 0.03～
0.06%。
Nb：It is the element for playing remarkable effect in a kind of operation of rolling to crystal grain refinement.In recrystallization rolling sequence, Nb passes through
Strain induced precipitate hinders the recovery and recrystallization of deformed austeaite so as to crystal grain thinning, and this is just being quenched, returned for big thickness steel plate
Fire still there is tiny tissue to provide the foundation after processing, and be conducive to improving its toughness.But limited and heating by C contents
The impact of temperature, too high Nb cannot solid solution, does not equally play effect and increase cost.Additionally, too high Nb contents pair
Welding performance has detrimental effect.The present invention controls its content≤0.04%.
Al：Act primarily as fixed nitrogen and deoxidation and the aging phenomenon of steel is reduced or eliminated.Al engage with N to form AlN can be with
Effectively crystal grain thinning, improves hardness, intensity and the toughness of steel, but too high levels then contains the field trash of Al（Such as aluminium oxide etc.）
Increase can damage the toughness of steel.Therefore, the present invention controls its content 0.06～0.1%.Additionally, in order to ensure element B in steel
Solid solution capacity so as to increase the quenching degree of steel, the content of Al must also meet the requirement of Al >=(Mn/C) × (%N).
B：It is to improve hardenability of steel element the most significant, the micro B of addition can suppress ferrite on austenite grain boundary
Forming core and significantly improve the quenching degree of steel, while having no significant effect to other performance.Succedaneum of the B as expensive alloying elements
The uniformity of steel plate thickness direction microscopic structure can be improved so as to improve " entire body hardening " performance of steel plate through-thickness.B contains
The too low raising for being unfavorable for quenching degree of amount, it is too high, brittle particle Fe can be promoted23(C, B)6Or the formation of FeB, while also increasing
Big welding crack sensibility causes the welding performance of steel plate to reduce.The present invention controls its content for 0.0010～0.0020%.
S、P：For the objectionable impurities elements in steel, the defect such as segregation is easily formed, is mingled with.Steel plate can be given as impurity element
Toughness (the particularly toughness of steel plate core) and the toughness of welding heat affected zone bring detrimental effect, should reduce which as far as possible and contain
Amount.Present invention control P≤0.010%, S≤0.002%.
Ca：To the rotten with remarkable effect of steel inclusion, make inclusion balling, be evenly distributed so as to reduce to toughness
Adverse effect, while the mobility for also improving molten steel improves nozzle blocking problem.Ca contents are controlled in the present invention for 0.0005
～0.005, and Ca/S >=1.
Carbon equivalent ce V（= C + Mn/6 + (Cr + Mo + V)/5 + (Cu + Ni)/15）：It is to evaluate welded steel
One important indicator of performance.The low welding performances for being conducive to steel of CEV but be unfavorable for quenching when formed high intensity geneva
Body is organized, though CEV height is conducive to the formation of martensitic structure, can deteriorate the welding performance of steel, therefore, present invention control
CEV≤0.75%。
It is this that a kind of high tenacity of entire body hardening as above is easily welded special thickness wear-resisting steel plate and manufactured by continuous casting billet
What sample was realized：
Raw materials for metallurgy is prepared by the chemical composition of the steel plate, the pretreatment of Jing KR molten iron, converter smelting, LF refining, RH are smart successively
Refining and continuous casting, produce high cleanliness molten steel and thickness >=370mm with low center segregation and loose, flawless and degree of purity
High continuous casting billet（Center segregation：It is parity with or superiority over 0.5 grade of C classes, center porosity：0.5 grade is parity with or superiority over, non-stop layer crackle,
Chink stricture of vagina and triangular area crack；Field trash：A, B, C class is slightly=0, D classes are slightly≤0.5；A classes are carefully≤0.5；B classes are thin
System≤0.5；C classes are carefully=0；D classes are carefully≤0.5；Ds class≤0.5）.H content palpus after Jing RH process in molten steel
≤0.0001%。
The hydrogen induced cracking (HIC) of steel plate is avoided to reduce H content therein to the slow cooling of continuous casting billet covering after the completion of continuous casting, even
Slab cooling goes out cover to 150～300 DEG C.After the completion of slow cooling to continuous casting billet surface band temperature clear up to guarantee its surface quality while
Ensure that continuous casting billet surface does not have crackle to produce during scafing.
Continuous casting steel billet through above-mentioned process is heated to into 1180～1280 DEG C, 2～4 hours is incubated, in making steel
The abundant solid solution of alloying element, plays its Strengthening and Toughening and acts on, it is ensured that the composition and performance of final products.After the completion of insulation, height is carried out
The de-scaling of pressure water is processed, and then carries out two-phase control rolling：First stage rolling for roughing, start rolling temperature at 1050～1150 DEG C,
Total draught >=40%, using lower rolling is suppressed, maximum single pass reduction ratio >=17% is abundant to ensure continuous casting billet heart defect
Make up so that big performance of the thickness steel plate at 1/2 thickness is guaranteed.For finish rolling, start rolling temperature exists for second stage rolling
870～930 DEG C, total draught >=20% is rolled to finished product thickness, by steel plate air cooling and aligning after the completion of rolling.
Steel plate after aligning 600～650 DEG C are air cooled on cold bed after covering heap slow cooling, the time：>=72 hours, to enter
So as to the performance being further ensured that at 1/2 thickness of finished steel plate, steel plate goes out H content after one step is reduced or removal is rolled in steel plate
Room temperature is air cooled to after cover.
The steel plate that slow cooling is completed carries out quenching+and temper obtains finished steel plate.Quenching Treatment uses continuous oven
Heating, heating-up temperature：890～920 DEG C, time inside furnace：1.7～2.0min/mm, using quenching press water quenching；Quenching press
Roller table speed≤3.5m/min, discharge >=8500m3/ h, during quenching must by steel plate water quenching to surface temperature≤～100 DEG C after
It is air cooled to room temperature.The technique of temper is：Temperature：200～220 DEG C, temperature retention time：（2.5～3.5min/mm）×
Steel plate thickness（mm）, after coming out of the stove, it is air cooled to room temperature.
The present invention is directed to the wear parts of heavy construction and mining machine（Such as sword plate）It is easy to the high tenacity of " entire body hardening "
The demand of especially big thickness wear-resisting steel plate is welded, is given birth to using the continuous casting process of the chemical composition of optimization, high Molten Steel Cleanliness, optimization
The high-quality of product（Low center segregation and loose, flawless）, high cleanliness continuous casting steel billet directly as blank, take control
The method of rolling+quenching+lonneal produces the steel plate of the especially big thickness for meeting this requirement.The thickness of steel plate is
110～180mm, final metallographic structure are tempering lath martensite（Near surface of steel plate）With tempering lath martensite+tempering
Lower bainite（Near steel plate core）.
Compared with prior art, main advantages of the present invention are：
The characteristics of wear-resisting steel plate of present invention manufacture has entire body hardening, high tenacity, easy welding, especially big thickness.In the whole of steel plate
On individual thickness x cross sectional, Brinell hardness is HBW320～HBW400, and -40 DEG C of Charpy-V impact power is equal at the steel plate 1/4 and 1/2 thickness>
60J, carbon equivalent ce V≤0.75%, the thickness of steel plate is 110～180mm, is manufactured using continuous casting billet.
Spy's thickness wear-resisting steel plate of present invention manufacture is manufactured as blank using continuous casting billet, relatively uses static ingot as base
Expect to manufacture the cogging course of processing eliminated in the operation of rolling, simplify production technology, meanwhile, also improve becoming a useful person for steel plate
Rate, reduces the manufacturing cost of steel plate, has the obvious production advantage in industrialized production.
Description of the drawings
Fig. 1,2 are respectively steel plate near surface involved by the embodiment of the present invention 1 and the microscopic structure at 1/2 thickness；
Fig. 3,4 are respectively steel plate near surface involved by the embodiment of the present invention 2 and the microscopic structure at 1/2 thickness；
Fig. 5,6 are respectively steel plate near surface involved by the embodiment of the present invention 3 and the microscopic structure at 1/2 thickness；
Fig. 7,8 are respectively steel plate near surface involved by the embodiment of the present invention 4 and the microscopic structure at 1/2 thickness；
Changes of the Fig. 9 for steel plate Brinell hardness along thickness x cross sectional involved by embodiment of the present invention 1-4.
Specific embodiment
It is for a more detailed description to technical scheme below in conjunction with presently preferred embodiments of the present invention.But this etc. is implemented
Example is only the description to better embodiment of the present invention, and can not produce any restriction to the scope of the present invention.
Embodiment 1
The present embodiment be related to thickness be 180mm entire body harden high tenacity easy-welding and wear-resistant steel plate, comprising composition and matter
Measuring percent is：C：0.12%, Si：0.28%, Mn：1.06%, P：0.004%, S：0.0006%, Cr：0.70%, Mo：0.50%, Ni：
2.49%, Cu：0.26%, Al：0.069%, V：0.035%, Nb：0.02%, N：0.0032%, B：0.0014%, Ca：0.0017%, it is remaining
Measure as ferrum and inevitable impurity element, carbon equivalent ce V (=C+Mn/6+(Cr+Mo+V)/5+(Cu+
Ni)/15)=0.73%, H=0.00007% Jing after RH process in molten steel.
The production technology of the high tenacity easy-welding and wear-resistant steel plate of the entire body hardening is as follows：
KR molten iron pretreatment converter smelting LF refine RH are carried out successively by above-mentioned chemical composition configuration raw materials for metallurgy
Refine continuous casting (thickness of strand：450mm) continuous casting billet covering slow cooling continuous casting billet cleaning heating (isothermal holding)
Covering heap slow cooling Q-tempering is aligned in high-pressure water descaling controlled rolling.
Further say, above-mentioned heating, controlled rolling, the concrete technology of cooling stage are：By the continuous casting billet of production（Center is inclined
Analysis：0.5 grade of C classes, center porosity：0.5 grade, non-stop layer crackle, chink stricture of vagina and triangular area crack, field trash：A, B, C, D class is thick
System=0；A, B, D class is carefully=0.5；C classes are carefully=0, Ds class=0）It is heated to 1240 DEG C and is incubated 3.5 hours, after comes out of the stove
Two-phase control rolling is carried out Jing after high-pressure water descaling process.The start rolling temperature of first stage rolling (i.e. roughing) is 1110 DEG C, middle
Base thickness 235mm, total draught=47.8%, maximum single pass reduction ratio=17.6%；Second stage rolls opening for (i.e. finish rolling)
It is 880 DEG C to roll temperature, final thickness of slab 180mm, total draught=23.4%.Align after rolling, the steel plate after aligning is in cold bed overhead
Be cooled to～640 DEG C at the slow cooling of cold bed covering heap go out cover after 96 hours and be air cooled to room temperature.
Steel plate after slow cooling enters continuous oven Quench heating, heating-up temperature：900 DEG C, time inside furnace：1.7min/mm, in roller
Road speed is 1.6m/min, discharge is 9000m3In the case of/h using quenching press water quenching steel plate to surface temperature～60 DEG C
It is air cooled to room temperature.Steel plate after Quenching Treatment carries out lonneal process, heating-up temperature：220 DEG C, temperature retention time：3.5min/mm
× steel plate thickness（mm）, after coming out of the stove, it is air cooled to room temperature.
The metallographic structure of the finished steel plate through-thickness of the above-mentioned technique manufactures of Jing is tempering lath martensite（Near steel plate
Surface）With tempering lath martensite+tempering lower bainite（Near steel plate core）, as depicted in figs. 1 and 2；Along steel plate thickness
, as shown in table 1 and Fig. 9, impact property is as shown in table 1 for the Brinell hardness in direction.It has high low-temperature flexibility（In steel when -40 DEG C
Charpy-V impact power at plate 1/4 and 1/2 thickness is equal>60J）With high uniformity of hardness（I.e. high entire body hardening capacity）.In steel
The difference of the Brinell hardness at plate surface and 1/2 thickness is only 4.4%.
Embodiment 2
The present embodiment be related to thickness be 125mm entire body harden high tenacity easy-welding and wear-resistant steel plate, comprising composition and matter
Amount percent and carbon equivalent ce V are same as Example 1.The manufacturing process of the embodiment is essentially identical with embodiment 1, main poor
It is not to roll and subsequent heat treatment, it is specific as follows：
By the continuous casting billet of production（Thickness：450mm, center segregation：0.5 grade of C classes, center porosity：0.5 grade, non-stop layer crackle, angle
Crackle and triangular area crack, field trash：A, B, C, D class is slightly=0；A, B, D class is carefully=0.5；C classes are carefully=0, Ds classes
= 0）Be heated to 1260 DEG C and be incubated 3.5 hours, after coming out of the stove, two-phase control rolling is carried out Jing after high-pressure water descaling process.First stage rolls
The start rolling temperature of system (i.e. roughing) is 1120 DEG C, middle base thickness 200mm, total draught=55.6%, maximum single pass reduction ratio
= 19.9%；The start rolling temperature of second stage rolling (i.e. finish rolling) is 900 DEG C, final thickness of slab 125mm, total draught=37.5%.
Align after rolling, the steel plate after aligning is air cooled on cold bed～610 DEG C after the slow cooling of lower cold bed covering heap go out cover air cooling after 72 hours
To room temperature.
Steel plate after slow cooling enters continuous oven Quench heating, heating-up temperature：910 DEG C, time inside furnace：1.8min/mm, in roller
Road speed is 2.7m/min, discharge is 9000m3In the case of/h using quenching press water quenching steel plate to surface temperature～50 DEG C
It is air cooled to room temperature.Steel plate after Quenching Treatment carries out lonneal process, heating-up temperature：220 DEG C, temperature retention time：3.1min/mm
× steel plate thickness（mm）, after coming out of the stove, it is air cooled to room temperature.
The metallographic structure of the finished steel plate through-thickness of the above-mentioned technique manufactures of Jing is tempering lath martensite（Near steel plate
Surface）With tempering lath martensite+tempering lower bainite（Near steel plate core）, as shown in Figure 3 and Figure 4；Along steel plate thickness
, as shown in table 1 and Fig. 9, impact property is as shown in table 1 for the Brinell hardness in direction.It has high low-temperature flexibility（In steel when -40 DEG C
Charpy-V impact power at plate 1/4 and 1/2 thickness is equal>100J）With high uniformity of hardness（I.e. high entire body hardening capacity）, in steel
The difference of the Brinell hardness at plate surface and 1/2 thickness is 11.4%.
Embodiment 3
The present embodiment be related to a kind of thickness be 115mm entire body harden high tenacity easy-welding and wear-resistant steel plate, comprising composition
And mass percent is：C：0.14%, Si：0.26%, Mn：1.05%, P：0.003%, S：0.0012%, Cr：0.66%, Mo：
0.51%, Ni：1.39%, Cu：0.26%, Al：0.063%, V：0.034%, Nb：0.0032%, N：0.0034%, B：0.0018%, Ca：
0.0021%, balance of ferrum and inevitable impurity element, carbon equivalent ce V (=C+Mn/6+(Cr+Mo+V)/5
+ (Cu+Ni)/15)=0.67%, H=0.00006% Jing after RH process in molten steel.
KR molten iron pretreatment converter smelting LF refines are carried out successively by above-mentioned chemical composition configuration raw materials for metallurgy
RH refine continuous casting (thickness of strand：370mm) continuous casting billet covering slow cooling continuous casting billet cleaning heating is (at insulation
Reason) high-pressure water descaling controlled rolling aligning covering heap slow cooling Q-tempering.
Further say, above-mentioned heating, controlled rolling, the concrete technology of cooling stage are：By continuous casting billet（Center segregation：C classes
0.5 grade, center porosity：0.5 grade, non-stop layer crackle, chink stricture of vagina and triangular area crack, field trash：A, B, C, D class is slightly=0；
A, B, D class is carefully=0.5；C classes are carefully=0, Ds class=0）It is heated to 1250 DEG C and is incubated 2.5 hours, then Jing high-pressure water descalings
After carry out two-phase control rolling, the start rolling temperature of first stage rolling (i.e. roughing) is 1090 DEG C, middle base thickness 200mm, total compression
Rate=45.9%, maximum single pass reduction ratio=18.7%；The start rolling temperature of second stage rolling (i.e. finish rolling) is 920 DEG C, most
Soleplate thickness 115mm, total draught=42.5%.After rolling align, steel plate is cooled on cold bed～630 DEG C at cold bed covering heap
Slow cooling goes out cover after 72 hours and is air cooled to room temperature.
Steel plate after slow cooling enters continuous oven Quench heating, heating-up temperature：920 DEG C, time inside furnace：1.9min/mm, in roller
Road speed is 2.0m/min, discharge is 9000m3In the case of/h using quenching press water quenching steel plate to surface temperature～50 DEG C
It is air cooled to room temperature.Steel plate after Quenching Treatment carries out lonneal process, heating-up temperature：200 DEG C, temperature retention time：2.8min/mm
× steel plate thickness（mm）, after coming out of the stove, it is air cooled to room temperature.
The metallographic structure of the finished steel plate through-thickness of the above-mentioned technique manufactures of Jing is tempering lath martensite（Near steel plate
Surface）With tempering lath martensite+tempering lower bainite（Near steel plate core）, as shown in Figure 5 and Figure 6；Along steel plate thickness
, as shown in table 1 and Fig. 9, impact property is as shown in table 1 for the Brinell hardness in direction.It has high low-temperature flexibility（In steel when -40 DEG C
Charpy-V impact power at plate 1/4 and 1/2 thickness is equal>100J）With high uniformity of hardness（I.e. high entire body hardening capacity）, in steel
The difference of the Brinell hardness at plate surface and 1/2 thickness is 10.4%.
Embodiment 4
The present embodiment be related to a kind of thickness be 110mm entire body harden high tenacity easy-welding and wear-resistant steel plate, comprising composition
And mass percent is：C：0.14%, Si：0.28%, Mn：1.06%, P：0.004%, S：0.0009%, Cr：0.50%, Mo：
0.48%, Ni：1.39%, Cu：0.24%, Al：0.064%, V：0.038%, Nb：0.004%, N：0.0019%, B：0.0016%, Ca：
0.0015%, balance of ferrum and inevitable impurity element, carbon equivalent ce V (=C+Mn/6+(Cr+Mo+V)/5
+ (Cu+Ni)/15)=0.63%, H=0.00009% Jing after RH process in molten steel.
The manufacturing process of the embodiment is essentially identical with embodiment 3, main difference is that rolling and subsequent heat treatment
Aspect, it is specific as follows：
By continuous casting billet（370mm is thick, center segregation：0.5 grade of C classes, center porosity：0.5 grade, non-stop layer crackle, chink stricture of vagina and three
Angular region crackle, field trash：A, B, C, D class is slightly=0；A, B, D class is carefully=0.5；C classes are carefully=0, Ds class=0.5）Plus
Heat is incubated 2.8 hours to 1220 DEG C, then two-phase control rolling is carried out Jing after high-pressure water descaling, and the first stage rolls opening for (i.e. roughing)
It is 1100 DEG C to roll temperature, middle base thickness 195mm, total draught=47.3%, maximum single pass reduction ratio=19.2%；Second-order
The start rolling temperature of section rolling (i.e. finish rolling) is 920 DEG C, final thickness of slab 110mm, total draught=43.6%.Align after rolling, cold
Steel plate is cooled on bed～650 DEG C at the slow cooling of cold bed covering heap go out cover after 72 hours and be air cooled to room temperature.
Steel plate after slow cooling enters continuous oven Quench heating, heating-up temperature：910 DEG C, time inside furnace：2.0min/mm, in roller
Road speed is 2.0m/min, discharge is 9000m3In the case of/h using quenching press water quenching steel plate to surface temperature～50 DEG C
It is air cooled to room temperature.Steel plate after Quenching Treatment carries out lonneal process, heating-up temperature：200 DEG C, temperature retention time：2.5min/mm
× steel plate thickness（mm）, after coming out of the stove, it is air cooled to room temperature.
The metallographic structure of the finished steel plate through-thickness of the above-mentioned technique manufactures of Jing is tempering lath martensite（Near steel plate
Surface）With tempering lath martensite+tempering lower bainite（Near steel plate core）, as shown in Figure 7 and Figure 8；Along steel plate thickness
, as shown in table 1 and Fig. 9, impact property is as shown in table 1 for the Brinell hardness in direction.It has high low-temperature flexibility（In steel when -40 DEG C
Charpy-V impact power at plate 1/4 and 1/2 thickness is equal>100J）With high uniformity of hardness（I.e. high entire body hardening capacity）, in steel
The difference of the Brinell hardness at plate surface and 1/2 thickness is 16.2%.
The impact property and Brinell hardness of the steel plate of 1 embodiment of table manufacture
Claims (5)
1. a kind of high tenacity of entire body hardening easily welds special thickness wear-resisting steel plate, it is characterised in that：Steel plate element based on Fe,
And also include the chemical composition of following mass percent：C：0.11～0.15%, Si：0.20～0.40%, Mn：0.9～1.3%,
P：≤ 0.010%, S：≤ 0.002%, Cr：0.4～0.8%, Mo：0.4～0.7%, Ni：1.0～2.6%, Cu：0.2～0.5%, Al：
0.06～0.1%, V：0.03～0.06%, Nb：≤ 0.04%, N：≤ 0.006%, B：0.001～0.002%, Ca：0.0005～
0.005, and Ca/S >=1, Al >=(Mn/C) × (%N), and inevitably impurity element；Carbon equivalent ce V（= C + Mn/6 +
(Cr + Mo + V)/5 + (Cu + Ni)/15）≤0.75%.
2. the high tenacity of entire body hardening according to claim 1 easily welds special thickness wear-resisting steel plate, it is characterised in that：Steel plate is thick
Spend for 110～180mm, metallographic structure is tempering lath martensite（Near surface of steel plate）With tempering lath martensite+tempering
Lower bainite（Near steel plate core）.
3. the high tenacity of entire body hardening according to claim 1 easily welds special thickness wear-resisting steel plate, it is characterised in that：Gained steel
Brinell hardness of the plate on whole thickness section is HBW320～HBW400, -40 DEG C of the Charpy at the steel plate 1/4 and 1/2 thickness
Ballistic work is equal>60J.
4. in a kind of manufacturing claims 1 to 3, the high tenacity of entire body hardening described in any claim easily welds special thickness abrasion-resistant stee
The method of plate, it is characterised in that：The pretreatment of Jing KR molten iron, converter smelting, LF refining, RH refines and continuous casting, produce height successively
The continuous casting steel billet with low center segregation and loose, flawless and high purity of degree of purity molten steel and thickness >=370mm, center
Segregation：It is parity with or superiority over 0.5 grade of C classes, center porosity：0.5 grade is parity with or superiority over, non-stop layer crackle, chink stricture of vagina and trigonum are split
Stricture of vagina；Field trash：A, B, C class is slightly=0, D classes are slightly≤0.5；A classes are carefully≤0.5；B classes are carefully≤0.5；C classes are carefully
= 0；D classes are carefully≤0.5；Ds class≤0.5）, H content palpus≤0.0001% after Jing RH process in molten steel；
The slow cooling of continuous casting billet covering goes out cover to 150～300 DEG C, and then continuous casting billet surface band temperature is cleared up；
Continuous casting billet is heated to into 1180～1280 DEG C, the de-scaling of 2～4 hours laggard horizontal high voltage water and two-phase control rolling is incubated；First
Stage rolling is roughing, and at 1050～1150 DEG C, total draught >=40% is adopted and suppresses lower rolling, maximum single pass start rolling temperature
Reduction ratio >=17%；Second stage rolling for finish rolling, start rolling temperature at 870～930 DEG C, total draught >=20%, after the completion of rolling
Implement air cooling and aligning；
Steel plate after aligning 600～650 DEG C are air cooled on cold bed after covering heap slow cooling, go out cover after >=72 hours and be air cooled to room
Temperature；
The steel plate of slow cooling to room temperature is carried out quenching+temper obtains finished steel plate.
5. the high tenacity that continuous casting billet according to claim 4 manufactures entire body hardening easily welds the side of special thickness wear-resisting steel plate
Method, it is characterised in that：The Quenching Treatment of the quenching+temper is carried out using continuous oven and quenching press, Quench heating temperature
Degree：890～920 DEG C, time inside furnace：1.7～2.0min/mm, using quenching press water quenching；Quenching press roller table speed≤3.5m/
Min, discharge >=8500m3/ h, during quenching must by steel plate water quenching to surface temperature≤～100 DEG C after be air cooled to room temperature；At tempering
Temperature during reason：200～220 DEG C, temperature retention time：（2.5～3.5min/mm）× steel plate thickness（mm）, it is air cooled to after coming out of the stove
Room temperature.
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| CN107130172A (en) * | 2017-05-27 | 2017-09-05 | 江阴兴澄特种钢铁有限公司 | The overall constrictive type high tenacity of 400HBW grades of Brinell hardness easily welds special thick wear-resisting steel plate and its manufacture method |
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| CN110846571A (en) * | 2019-10-28 | 2020-02-28 | 南京钢铁股份有限公司 | High-toughness low-alloy wear-resistant steel thick plate and manufacturing method thereof |
| WO2021017520A1 (en) | 2019-07-31 | 2021-02-04 | 江阴兴澄特种钢铁有限公司 | Wear-resistant steel with excellent surface quality and preparation method therefor |
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| CN113249643A (en) * | 2021-03-23 | 2021-08-13 | 江阴兴澄特种钢铁有限公司 | Mining high-strength carburized chain steel and preparation method thereof |
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