CN110512147A - A kind of rare earth NM400 Wide and Heavy Plates and its production method - Google Patents
A kind of rare earth NM400 Wide and Heavy Plates and its production method Download PDFInfo
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- CN110512147A CN110512147A CN201910880523.2A CN201910880523A CN110512147A CN 110512147 A CN110512147 A CN 110512147A CN 201910880523 A CN201910880523 A CN 201910880523A CN 110512147 A CN110512147 A CN 110512147A
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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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
-
- 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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
-
- 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
- C21D2211/008—Martensite
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a kind of rare earth NM400 Wide and Heavy Plates, component comprising following weight percent: C:0.14~0.17%, Ti:0.008~0.016%, Als:0.017~0.032%, B:0.0006~0.0020%, Ca:0.0010~0.0025%, rare earth Re:0.0009~0.0020%.The invention also discloses the production methods of rare earth NM400 Wide and Heavy Plates.Rare earth NM400 Wide and Heavy Plates of the invention and its production method have high intensity, high tenacity, high-ductility, high-wear resistance by the content of optimization each component and rare earth Re, and the Wide and Heavy Plates that optimization process obtains；There is no the defect in terms of the quality such as handling ease cracking, wide market is conducive to the needs for meeting social development.
Description
Technical field
The present invention relates to metallurgical plate technical field more particularly to a kind of rare earth NM400 Wide and Heavy Plates and its production method.
Background technique
High-performance abrasion-proof steel is mainly used in mining machinery, coal mining machinery, environmental protection machinery, engineering machinery and conveying
Machinery etc. wears the critical component at larger position and the more complex heavy heavy construction of applying working condition, it is desirable that has high-intensitive, height
The stringent technical characterstics such as toughness, high-ductility, high abrasion, big thickness.
Abrasion-resistant stee disclosed in the prior art includes that patent CN106498295A discloses " high-strength abrasion-proof steel and its manufacturer
Method ", ingredient percent are as follows: C:0.22~0.25%, Si:0.21~0.26%, Mn:1.11~1.14%, B:0.0014
~0.0018%, Ni:0.008~0.011%, Cr:0.16~0.19%, Cu:0.018~0.032%, Mo:0.002~
0.006%, Nb:0.018~0.022%, P≤0.014%, S≤0.002%, remaining is Fe and inevitable impurity.This is specially
Abrasion-resistant stee disclosed in benefit belongs to hot continuous rolling roll bending, using quenching+lonneal process；Patent CN108220806A invention
It discloses " a kind of ultra-high-strength/tenacity abrasion-resistant stee and preparation method thereof ", the chemical component of steel is wt%:C:0.25~0.55, Si:
1.50~2.50, Mn:1.50~2.20, Cr:0.3~1.0, Mo:0.2~0.8, Re:0.01~0.1, S < 0.01, P <
0.01, remaining is Fe.Production method is refined through electric arc furnaces or intermediate frequency furnace melting, then through VOD, LF, and continuous casting billet or ingot casting roll
System or forging and molding, then through special thermal treatment quenching+average tempering；Patent CN105568165A disclosure of the invention is " a kind of high-strength
Tenacity, low-alloy abrasion-resistant stee and preparation method thereof ", high-obdurability low-alloy abrasion-resistant stee, the mass percent of ingredient are as follows: C:
0.40-0.60%, Si:0.60-1.2%, Mn:0.30-1.0%, Cr:0.25-0.35%, Mo:0.15-0.25%, Cu:
0.40-0.60%, Re:0.10-0.15%, P:0-0.025%, S:0-0.025%, remaining is Fe and inevitable impurity.
Heat treatment process in preparation method is that liquid is quenched with warm same temperature hardening heat treatment technique, includes: that 1) will cast resulting casting
It is heated to 820-860 DEG C of progress austenitizing；2) casting is put into hardening media and quenches；3) it is cooled to cast(ing) surface temperature
It is taken out at 200-320 DEG C；4) casting belts temperature is transferred to progress bainite isothermal transformation in 260-330 DEG C of holding furnace, transformation immediately
Time 1-2h then takes out air-cooled.
Currently, the critical component of domestic above-mentioned heavy large-scale engineering machinery uses NM### series steel plate, generally existing low temperature punching
Hit the defect that poor toughness, center portion wearability are poor, and handling ease cracks；And coal machine and mining machinery steel using amount it is big, for a long time according to
Rely import, the defect of industrial chain higher cost；Also, the production method of abrasion-resistant stee in the prior art disclosed above is returned using high temperature
Fire, the thermal treatment production process method of quenching+tempering, generally existing complex process, process flow is long, defect at high cost.Cause
This, to Optimal Development novel wear resistant steel plate, improve plate quality and optimize wear-resisting steel plate production method there is an urgent need.
Therefore, those skilled in the art is dedicated to developing a kind of rare earth NM400 Wide and Heavy Plates and its production method.
Summary of the invention
In view of the drawbacks described above of the prior art, it is raw that the technical problem to be solved by the present invention is to wear-resisting steel plates in the prior art
Production. art is complicated, and process flow is long, at high cost, and that there are low-temperature impact toughness is poor for obtained wear-resisting steel plate, center portion wearability is poor,
Defect problem in terms of the quality such as handling ease cracking.
To achieve the above object, the present invention provides a kind of rare earth NM400 Wide and Heavy Plates, it includes following weight percent
Component: C:0.14~0.17%, Ti:0.008~0.016%, Als:0.017~0.032%, B:0.0006~
0.0020%, Ca:0.0010~0.0025%, rare earth Re:0.0009~0.0020%.
Further, the Wide and Heavy Plates, it includes the components of following weight percent: C:0.14~0.17%, Si:
0.20~0.30%, Mn:1.20~1.45%, P≤0.008%, S≤0.005%, Nb:0.015~0.025%, Ti:
0.008~0.016%, Cr:0.45~0.85%, Mo:0.15~0.45%, Als:0.017~0.032%, B:0.0006~
0.0020%, Ca:0.0010~0.0025%, rare earth Re:0.0009~0.0020%；
In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of C is 0.14%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of C is 0.15%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of C is 0.17%；
In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Si is 0.2%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Si is 0.25%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Si is 0.3%；
In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Mn is 1.2%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Mn is 1.25%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Mn is 1.45%；
In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of P is 0.008%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of P is 0.007%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of P is 0.005%；
In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of S is 0.001%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of S is 0.004%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of S is 0.005%；
In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Nb is 0.015%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Nb is 0.022%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Nb is 0.025%；
In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Ti is 0.008%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Ti is 0.012%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Ti is 0.016%；
In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Cr is 0.45%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Cr is 0.67%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Cr is 0.85%；
In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Mo is 0.15%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Mo is 0.40%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Mo is 0.45%；
In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Als is 0.017%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Als is
0.025%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Als is
0.030%；
In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of B is 0.0006%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of B is 0.0011%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of B is 0.0020%；
In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Ca is 0.0010%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Ca is
0.0018%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of Ca is
0.0025%；
In better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of rare earth Re is
0.0009%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of rare earth Re is
0.0016%；
In another better embodiment of the invention, the Wide and Heavy Plates include that the weight percent of rare earth Re is
0.0020%；
Another aspect of the present invention provides a kind of production method of rare earth NM400 Wide and Heavy Plates, comprising the following steps:
Step 1, using Jing Guo KR desulfurization pretreatment molten iron and high-quality steel scrap as raw material, carry out converter smelting, then
It carries out LF refining and RH application of vacuum obtains molten steel；
The molten steel of step 1 is obtained heavy slab by continuous casting working procedure by step 2；
Step 3, the heavy slab for obtaining step 2 heat in heating furnace, 1190 DEG C~1250 DEG C of slab heating temperature, add
The hot time is 220~300min, and soaking time is greater than 40min；
Slab after step 3 heating is carried out two-phase control rolling and cooling by step 4；
Step 5 obtains the rare earth NM400 Wide and Heavy Plates using same temperature hardening heat treatment step 4 steel board after cooling:
Further, the production method of the Wide and Heavy Plates, in the step 1, when the RH application of vacuum, terminate it is true
Sky carries out first 3~5 minutes addition Rare Earth Lanthanum cerium alloys of multiple pressure；
Further, the production method of the Wide and Heavy Plates, step 1 specific steps are as follows: using pre- by KR desulfurization
The molten iron of processing and high-quality steel scrap are as raw material, and bottom-blowing of converter is using whole Argon mode, terminal hit at first time, to reduce because mending
Blowing leads to molten steel nitrogen pick-up；The further deoxidation of LF ladle refining furnace, desulfurization, removal be mingled with, adjusting component and temperature, strict control
Argon intensity formulates Argon curve according to the principle that early period is strong, mid-term is weak compared with strong, later period, is guaranteeing deoxidation, deep desulfurization, alloy
While change, secondary oxidation and the nitrogen pick-up of refining process are reduced；RH process is guaranteeing liquid steel temperature using deep degasification technique is recycled
The gas contents such as hydrogen, oxygen, nitrogen are greatly reduced under the premise of stabilization, reduce adverse effect of the pernicious gas to steel, Rare Earth Lanthanum cerium
Alloy is added for 3-5 minutes before being vacuum-treated the multiple pressure of end by vacuum chute；Finally obtain the quality percentage of molten steel ingredient
Than for C:0.14~0.17%, Si:0.20~0.30%, Mn:1.20~1.45%, P≤0.008%, S≤0.005%, Nb:
0.015~0.025%, Ti:0.008~0.016%, Cr:0.45~0.85%, Mo:0.15~0.45%, Als:0.017~
0.032%, B:0.0006~0.0020%, Ca:0.0010~0.0025%, rare earth Re:0.0009~0.0020%, surplus
For Fe and inevitable impurity；
Further, the production method of the Wide and Heavy Plates, in the step 2, when the continuous casting, permanent pulling rate is 0.8~
1.1m/min；Low overheat cast temperature is 15~25 DEG C；
Further, the production method of the Wide and Heavy Plates, in the step 2, continuous casting heavy slab with a thickness of 250mm or
300mm；
Further, the production method of the Wide and Heavy Plates, step 2 specific steps are as follows: conticaster is straight arc company
Casting machine, using great Bao, middle water-coating port blowing argon, solidification end dynamic soft-reduction, 380A high current electromagnetic agitation and optimization
Dynamic secondary cooling technology, by constant temperature, permanent pulling rate technique (0.8~1.1m/min), low overheat is cast (15~25 DEG C), is subtracted
The defects of light continuous casting billet center segregation, center porosity, crackle, oscillation mark, production obtains the high-quality plate of thickness 250mm and 300mm
Base；
Further, the production method of the Wide and Heavy Plates, in the step 4, the two-phase control rolling, the first stage rolls
Start rolling temperature processed is 1170~1250 DEG C；It is≤920 DEG C, 790~840 DEG C of finishing temperature that second stage, which rolls start rolling temperature,；
Further, the production method of the Wide and Heavy Plates, in the step 4, cooling temperature is 670~720 DEG C；
Further, the production method of the Wide and Heavy Plates, in the step 5, the isothermal hardening hardening heat is
890 DEG C~920 DEG C, isothermal hardening time inside furnace is 1.5t+10min, and t is steel plate thickness (unit mm)；
In better embodiment of the invention, the production method of the Wide and Heavy Plates, in the step 3, the slab
1190 DEG C of heating temperature；
In another better embodiment of the invention, the production method of the Wide and Heavy Plates is described in the step 3
1250 DEG C of slab heating temperature；
In another better embodiment of the invention, the production method of the Wide and Heavy Plates is described in the step 3
1210 DEG C of slab heating temperature；
In better embodiment of the invention, the production method of the Wide and Heavy Plates, in the step 3, the slab
Heating time is 289min；
In another better embodiment of the invention, the production method of the Wide and Heavy Plates is described in the step 3
Slab heating time is 293min；
In another better embodiment of the invention, the production method of the Wide and Heavy Plates is described in the step 3
Slab heating time is 239min；
In better embodiment of the invention, the production method of the Wide and Heavy Plates, in the step 4, two rank
Section rolling, it is 1240 DEG C that the first stage, which rolls start rolling temperature,；
In another better embodiment of the invention, the production method of the Wide and Heavy Plates is described in the step 4
Two-phase control rolling, it is 1220 DEG C that the first stage, which rolls start rolling temperature,；
In another better embodiment of the invention, the production method of the Wide and Heavy Plates is described in the step 4
Two-phase control rolling, it is 1225 DEG C that the first stage, which rolls start rolling temperature,；
In better embodiment of the invention, the production method of the Wide and Heavy Plates, in the step 4, two rank
Section rolling, first stage rolling is 897 DEG C to temperature；
In another better embodiment of the invention, the production method of the Wide and Heavy Plates is described in the step 4
Two-phase control rolling, first stage rolling is 890 DEG C to temperature；
In another better embodiment of the invention, the production method of the Wide and Heavy Plates is described in the step 4
Two-phase control rolling, first stage rolling is 917 DEG C to temperature；
In better embodiment of the invention, the production method of the Wide and Heavy Plates, in the step 4, two rank
Section rolling, the finishing temperature of second stage rolling are 823 DEG C；
In another better embodiment of the invention, the production method of the Wide and Heavy Plates is described in the step 4
Two-phase control rolling, the finishing temperature of second stage rolling are 817 DEG C；
In another better embodiment of the invention, the production method of the Wide and Heavy Plates is described in the step 4
Two-phase control rolling, the finishing temperature of second stage rolling are 790 DEG C；
In better embodiment of the invention, the production method of the Wide and Heavy Plates, in the step 4, cooling temperature
It is 689 DEG C；
In another better embodiment of the invention, the production method of the Wide and Heavy Plates is cooling in the step 4
Temperature is 710 DEG C；
In another better embodiment of the invention, the production method of the Wide and Heavy Plates is cooling in the step 4
Temperature is 719 DEG C；
In better embodiment of the invention, the production method of the Wide and Heavy Plates, in the step 5, the isothermal
Quenching hardening heat is 899 DEG C；
In another better embodiment of the invention, the production method of the Wide and Heavy Plates is described in the step 5
Isothermal hardening hardening heat is 911 DEG C；
In another better embodiment of the invention, the production method of the Wide and Heavy Plates is described in the step 5
Isothermal hardening hardening heat is 902 DEG C；
Using above scheme, rare earth NM400 Wide and Heavy Plates and its production method disclosed by the invention have following technology effect
Fruit:
(1) rare earth NM400 Wide and Heavy Plates of the invention, compared with NM series wear-resisting steel plate in the prior art, the application is wide
Thick steel plate by the content of each component and rare earth Re in optimization Wide and Heavy Plates, and adds Ti, Als, Ca group of proper ratio
Point, obtained rare earth NM400 Wide and Heavy Plates have high intensity, high tenacity, high-ductility, high-wear resistance, effectively improve existing
The defect of wear-resisting steel plate handling ease cracking；
(2) production method of rare earth NM400 Wide and Heavy Plates of the invention, optimization production method use same temperature hardening heat treatment
Method avoids the thermal treatment production process method using quenching+tempering disclosed in the prior art, it is crisp to effectively prevent lonneal
Property, the sensibility of steel plate quenching stress cracking is reduced, simplifies and shortens process flow, reduces production cost；
(3) rare earth NM400 Wide and Heavy Plates production method of the invention, by optimize the temperature of production method, the time, etc. works
Skill parameter, obtained rare earth NM400 Wide and Heavy Plates metallographic structure are that crystal grain is tiny and uniform martensitic structure, are conducive to improve
The low-temperature impact toughness and center portion wearability of steel plate improve product quality；
(4) the obtained rare earth NM400 Wide and Heavy Plates product of the present invention can be widely used for mining machinery, coal mining it is mechanical,
Environmental protection machinery, engineering machinery and conveying machinery etc. wear the pass at larger position and the more complex heavy heavy construction of applying working condition
Key member etc. needs the preparation of wear parts, is conducive to promote and apply；
In conclusion rare earth NM400 Wide and Heavy Plates of the invention and its production method, pass through optimization each component and rare earth
The content of Re, and Ti, Als, Ca component of proper ratio are added, and the Wide and Heavy Plates that optimization process obtains are with high-strength
Degree, high tenacity, high-ductility, high-wear resistance；There is no the defect in terms of quality such as handling ease cracking, wide market,
Being conducive to the needs for meeting social development, the production method of Wide and Heavy Plates of the invention, process is simple, and it is at low cost, it is suitble to
Industrialized production.
Make below with reference to technical effect of the specific embodiment to design of the invention, specific structure and generation further
Illustrate, to fully understand the purposes, features and effects of the present invention.
Specific embodiment
The preferred embodiment of the present invention introduced below keeps its technology contents more clear and is easy to understand.The present invention can be with
It is emerged from by many various forms of embodiments, protection scope of the present invention is not limited only to the implementation mentioned in text
Example.
The preparation of embodiment 1, rare earth NM400 Wide and Heavy Plates
The preparation of the present embodiment Wide and Heavy Plates uses following steps:
Raw material molten iron pass through Deep Desulphurization of Hot Metal, converter top and bottom blowing, ladle argon-blown, LF external refining, RH application of vacuum and
Continuous casting working procedure obtains 300mm heavy slab；Heavy slab is heated in heating furnace, 1250 DEG C of slab heating temperature, heating time
293min enters rolling process after keeping the temperature 50min；1240 DEG C of start rolling temperature of first stage rolling, using slab length direction
It is broadened, control is 20% or more with respect to more than reduction ratio at least two passages for single pass, when rolled piece is with a thickness of 161mm
(2.3 times of finished product thickness) then carries out second stage finish rolling rolling to temperature to 897 DEG C on roller-way, and finishing temperature is 823 DEG C,
Finished steel plate is with a thickness of 70mm；After rolling, steel plate enters cooling (ACC) equipment of acceleration, is cooled to the speed of 8 DEG C/s
689 DEG C, quick offline slow cooling；Carry out same temperature hardening heat treatment after ball blast, 899 DEG C of hardening heat, time inside furnace 115min, etc.
Surface of steel plate mean temperature is 100 DEG C after temperature quenching, obtains rare earth NM400 Wide and Heavy Plates；
The preparation of embodiment 2, rare earth NM400 Wide and Heavy Plates
The preparation of the present embodiment Wide and Heavy Plates uses following steps:
Smelting, continuous casting embodiment obtain 250mm heavy slab with embodiment 1；Heavy slab is heated in heating furnace, plate
1210 DEG C of base heating temperature, slab heating time 289min, enter rolling process after keeping the temperature 50min；First stage start rolling temperature
1220 DEG C, broadened using slab length direction, single pass with respect to it is more than reduction ratio at least two passages control 20% with
On, when rolled piece is with a thickness of 125mm (2.5 times of finished product thickness), to temperature to 890 DEG C on roller-way, then carry out second stage essence
Rolling, finishing temperature are 817 DEG C, and finished steel plate is with a thickness of 50mm；After rolling, steel plate enters acceleration cooling (ACC) and sets
It is standby, 710 DEG C are cooled to the speed of 8 DEG C/s, quick offline slow cooling；Same temperature hardening heat treatment, hardening heat 911 are carried out after ball blast
DEG C, time inside furnace 85min, surface of steel plate mean temperature is 180 DEG C after isothermal hardening, obtains rare earth NM400 Wide and Heavy Plates.
The preparation of embodiment 3, rare earth NM400 Wide and Heavy Plates
The preparation of the present embodiment Wide and Heavy Plates uses following steps:
Smelting, continuous casting embodiment obtain 250mm heavy slab with embodiment 1；Heavy slab is heated in heating furnace, plate
1190 DEG C of base heating temperature, slab heating time 239min, enter rolling process after keeping the temperature 50min；First stage start rolling temperature
1225 DEG C, single pass with respect to more than reduction ratio at least two passages control 20% or more, when (finished product is thick with a thickness of 60mm for rolled piece
3 times of degree) when, to temperature to 917 DEG C on roller-way, second stage finish rolling rolling is then carried out, finishing temperature is 790 DEG C, finished product
Steel plate thickness is 30mm；After rolling, steel plate enters cooling (ACC) equipment of acceleration, is cooled to 720 with the speed of 10 DEG C/s
DEG C, quick offline slow cooling；Same temperature hardening heat treatment is carried out after ball blast, 902 DEG C of hardening heat, time inside furnace 55min, isothermal is quenched
Surface of steel plate mean temperature is 300 DEG C after fire, obtains rare earth NM400 Wide and Heavy Plates.
The Wide and Heavy Plates constituent content that detection Examples 1 to 3 obtains, the results are shown in Table 1.
1 unit of table: %
| Embodiment | C | Si | Mn | Cr | Mo | Nb | Ti | P | S | Als | Ca | B | Re |
| 1 | 0.17 | 0.30 | 1.20 | 0.85 | 0.45 | 0.025 | 0.016 | 0.007 | 0.004 | 0.030 | 0.0025 | 0.0020 | 0.0009 |
| 2 | 0.15 | 0.25 | 1.25 | 0.67 | 0.40 | 0.022 | 0.012 | 0.005 | 0.001 | 0.025 | 0.0018 | 0.0011 | 0.0016 |
| 3 | 0.14 | 0.20 | 1.45 | 0.45 | 0.15 | 0.015 | 0.008 | 0.008 | 0.005 | 0.017 | 0.0010 | 0.0006 | 0.0020 |
From the data in table 1, it can be seen that carbon content is between 0.14~0.17% in the Wide and Heavy Plates that the present embodiment 1~3 obtains, Ti
Content is between 0.008~0.016%, and Als content is between 0.017~0.030%, and B content is 0.0006~0.0020%
Between, for Ca content between 0.0010~0.0025%, rare earth Re content is free of valuable gold between 0.0009~0.0020%
Belong to element Ni.
Conventional mechanical property, series impact, surface and center portion are carried out to the Wide and Heavy Plates that the embodiment of the present invention 1~3 obtains
Hardness and bending property are examined, and inspection result is shown in Table 2.
Table 2
From the data in table 2, it can be seen that the Wide and Heavy Plates obtained using the production of present invention method, room temperature tensile value are existed
Between 1310~1330Mpa, elongation percentage A50% between 25~27, -20 DEG C of impact of collision work value between 54~130J, on
It states several parameter values and is all larger than customer requirement standard figures, show the excellent performance with high intensity, high tenacity, high-ductility；
- 40 DEG C of maximum conditions, -60 DEG C of transverse and longitudinal work value are closer to, and show the transverse and longitudinal of -40 DEG C of maximum conditions, -60 DEG C
The uniformity of toughness is higher；
The average hardness of surface and center portion is between 400~430HBW, the especially centre hardness requirement that also reaches NM400
Between 409~417HBW, show that Wide and Heavy Plates through thickness wear-resisting property is preferable；Show the rare earth that the present embodiment obtains
The wear-resisting property of NM400 Wide and Heavy Plates is good；
45 ° of processing performances of clod wash are intact, show that Wide and Heavy Plates have the excellent performance that preferably processing is not easy to crack.
In conclusion the process process of the embodiment of the present invention 1~3 is short, at low cost, obtained rare earth NM400 is generous
Steel plate has the comprehensive performances such as high intensity, high tenacity, high-ductility, high abrasion, solves that low temperature existing for industry is easy to crack, table
The status that layer is wear-resisting, center portion is not wear-resisting, is conducive to the critical component for being widely used in large-scale mine and coal mine, completely desirable cost
The higher ad eundem inlet plate of lattice, greatly reduces the manufacturing cost of steel, coal machine and mine industry, has further pushed production
The high quality of industry chain develops.
Other technologies scheme of the present invention also has similar beneficial effect.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that the ordinary skill of this field is without wound
The property made labour, which according to the present invention can conceive, makes many modifications and variations.Therefore, all technician in the art
Pass through the available technology of logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Scheme, all should be within the scope of protection determined by the claims.
Claims (8)
1. a kind of rare earth NM400 Wide and Heavy Plates, which is characterized in that the component comprising following weight percent:
C:0.14~0.17%, Ti:0.008~0.016%, Als:0.017~0.032%, B:0.0006~0.0020%,
Ca:0.0010~0.0025%, rare earth Re:0.0009~0.0020%.
2. Wide and Heavy Plates as described in claim 1, which is characterized in that the Wide and Heavy Plates, it includes following weight percent
Component:
C:0.14~0.17%, Si:0.20~0.30%, Mn:1.20~1.45%, P≤0.008%, S≤0.005%, Nb:
0.015~0.025%, Ti:0.008~0.016%, Cr:0.45~0.85%, Mo:0.15~0.45%, Als:0.017~
0.032%, B:0.0006~0.0020%, Ca:0.0010~0.0025%, rare earth Re:0.0009~0.0020%.
3. a kind of production method of rare earth NM360, which is characterized in that the specific steps of the production method include:
Step 1, using Jing Guo KR desulfurization pretreatment molten iron and high-quality steel scrap as raw material, carry out converter smelting, then carry out
LF refining and RH application of vacuum obtain molten steel；
The molten steel of step 1 is obtained heavy slab by continuous casting working procedure by step 2；
Step 3, the heavy slab for obtaining step 2 heat in heating furnace, and 1190 DEG C~1250 DEG C of slab heating temperature, when heating
Between be 220~300min, soaking time be greater than 40min；
Slab after step 3 heating is carried out two-phase control rolling and cooling by step 4；
Step 5 obtains the rare earth NM400 Wide and Heavy Plates using same temperature hardening heat treatment step 4 steel board after cooling.
4. method as claimed in claim 3, which is characterized in that in the step 1,
When the RH application of vacuum, first 3~5 minutes addition Rare Earth Lanthanum cerium alloys of multiple pressure are carried out terminating vacuum.
5. method as claimed in claim 3, which is characterized in that in the step 2,
Permanent pulling rate when the continuous casting is 0.8~1.1m/min；Low overheat cast temperature when the continuous casting is 15~25 DEG C.
6. method as claimed in claim 3, which is characterized in that in the step 4,
The two-phase control rolling, it is 1170~1250 DEG C that the first stage, which rolls start rolling temperature, is 880~917 DEG C to temperature；The
It is≤920 DEG C, 790~840 DEG C of finishing temperature that two-stage, which rolls start rolling temperature,；The cooling temperature is 670~720 DEG C.
7. method as claimed in claim 3, which is characterized in that in the step 5,
The isothermal hardening hardening heat is 890 DEG C~920 DEG C, and isothermal hardening time inside furnace is 1.5t+10min, and t is that steel plate is thick
Degree.
8. the Wide and Heavy Plates that a kind of any one of claim 3~7 the method produces, which is characterized in that
The Wide and Heavy Plates include the component of following weight percent: C:0.14~0.17%, Si:0.20~0.30%, Mn:
1.20~1.45%, P≤0.008%, S≤0.005%, Nb:0.015~0.025%, Ti:0.008~0.016%, Cr:
0.45~0.85%, Mo:0.15~0.45%, Als:0.017~0.032%, B:0.0006~0.0020%, Ca:0.0010
~0.0025%, rare earth Re:0.0009~0.0020%；
The Wide and Heavy Plates room temperature tensile value is 1310~1330Mpa, and elongation percentage A50% is 25~27, surface and center portion it is flat
Equal hardness is 400~430HBW.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107227426A (en) * | 2013-03-28 | 2017-10-03 | 杰富意钢铁株式会社 | Wear-resisting steel plate and its manufacture method with low-temperature flexibility and resistance to hydrogen embrittlement |
| CN107354382A (en) * | 2013-03-28 | 2017-11-17 | 杰富意钢铁株式会社 | Wear-resisting steel plate and its manufacture method with low-temperature flexibility |
| CN108546873A (en) * | 2018-04-17 | 2018-09-18 | 包头钢铁（集团）有限责任公司 | The manufacturing method of high-wearing feature steel plate and high-wearing feature steel plate |
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2019
- 2019-09-18 CN CN201910880523.2A patent/CN110512147A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107227426A (en) * | 2013-03-28 | 2017-10-03 | 杰富意钢铁株式会社 | Wear-resisting steel plate and its manufacture method with low-temperature flexibility and resistance to hydrogen embrittlement |
| CN107354382A (en) * | 2013-03-28 | 2017-11-17 | 杰富意钢铁株式会社 | Wear-resisting steel plate and its manufacture method with low-temperature flexibility |
| CN108546873A (en) * | 2018-04-17 | 2018-09-18 | 包头钢铁（集团）有限责任公司 | The manufacturing method of high-wearing feature steel plate and high-wearing feature steel plate |
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