CN107937803B - One kind having low-temperature impact toughness wear-resisting steel plate and preparation method thereof - Google Patents
One kind having low-temperature impact toughness wear-resisting steel plate and preparation method thereof Download PDFInfo
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- CN107937803B CN107937803B CN201711058288.8A CN201711058288A CN107937803B CN 107937803 B CN107937803 B CN 107937803B CN 201711058288 A CN201711058288 A CN 201711058288A CN 107937803 B CN107937803 B CN 107937803B
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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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- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/44—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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with 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
- C22C38/40—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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- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses one kind to have favorable low-temperature impact toughness wear-resisting steel plate and preparation method thereof, the wear-resisting steel chemical composition and its weight percentage are C 0.13~0.20%, Si 0.25~0.60%, Mn 0.4~0.8%, Ni0.15~0.35%, Mo 0.1~0.3%, Cr 0.25~0.60%, Ti 0.010~0.035%, P≤0.015%, S≤0.003%, B 0.0013~0.0030%, Al 0.010~0.050%, H≤0.0002%, N≤0.0035%, surplus is Fe and inevitable field trash, and Cr and Ni element meets 1.807C+1.077Si+0.797 Mn+7.727B >=Cr+Ni >=0.933C+0.45Si+0.121Mn+0.41B.The wear-resisting steel plate excellent combination property that the present invention obtains, preparation method are simple and practical.
Description
Technical field
The invention belongs to steel plate preparation technical fields, in particular it relates to which a kind of have favorable low-temperature impact toughness
And preparation method thereof.
Background technique
Abrasion-resistant stee is widely used in the wear-resistant material of various wear working conditions, and with the progress of production technology, new is resistance to
Mill steel steel grade emerges one after another, and smelts, casts, being heat-treated and process for machining is continuously improved, the comprehensive mechanical property of abrasion-resistant stee,
Wear-resisting property and service life are all stepping up, and application field increasingly expands.Engineering machinery, mining machinery, coal is often made
The machine components such as mine machinery, crusher are widely used in each department such as metallurgy, mine, building materials, electric power, railway and military affairs
In, such as bull-dozer, loading machine, excavator, dumper and various mining machineries, grab bucket, stacker-reclaimer, conveying warp architecture, break
Broken machine jaw, crushing wall, rolled mortar wall, tractor shoe, fan mill shock plate and railway switch etc..
Abrasion-resistant stee production usually requires that austenite is changed into martensitic structure to reach required intensity by quenching
And hardness, then lonneal processing is carried out to achieve the purpose that eliminate residual stress, it is finally reached tempered martensite's form,
But the abrasion-resistant stee of tempered martensite just directly results in the low-temperature impact of steel often due to reached higher intensity and hardness
Toughness is poor, thus brings inevitable mass defect to the use of product.
It the following is the progress in the prior art about low-temperature abrasion-resistant steel plate.
A kind of " low-alloy high-strength of 101775545 A Baoshan Iron & Steel Co., Ltd of China Patent Publication No. CN application
Spend high-flexibility wear-resistant steel plate and its manufacturing method ", the Nb cost that chemical component 0.01~0.04% is added in the steel is higher than this hair
Bright, room temperature impact function is greater than 80J, but it does not have -40 DEG C of low-temperature impact works in the effect of 50J.
China Patent Publication No. is " the high-ductility ultrahigh-strength wear-resisting steel plate " of 101638755 A Northeastern University of CN application
Steel Mn content easily forms center segregation in continuous casting process slab for 1.0~1.6%, Mn content height, seriously affects product
Performance uniformity, while quality gap of cracking can be caused, the welding performance of steel can be also reduced, while the product is smelted without LF
External refining, foreign substance in molten steel content not can guarantee, it will bring a negative impact to the impact flexibility of product.
A kind of " high-toughness wear-resistant of 101775539 A Baoshan Iron & Steel Co., Ltd of China Patent Publication No. CN application
Steel plate and its manufacturing method " the steel C content is 0.04~0.11wt%, it is known that carbon is to the harden ability for improving abrasion-resistant stee and quenches
Rigid effect and its obvious, has certain effect by reducing the toughness that carbon content improves steel, but can directly result in the through hardening of steel
Property reduce, performance thickness direction uniformity not can guarantee.It and is the important of measurement product service life for wear-resisting steel hardenability
Index, and harden ability is poor.
102666897 A Sumitomo Metal Industries, Ltd of China Patent Publication No. CN application " high-flexibility wear-resistant steel and
Its manufacturing method " invention steel grade is added to 0.005~0.03% Nb alloying element, higher cost.
101880831 A Northeastern University of China Patent Publication No. CN, Nanjing Steel stock Co., Ltd apply " a kind of
High-strength-and-toughness low alloy wear resistant and its manufacturing method " the invention steel grade Mn content is that 1.2~1.6%, Mn content height exists
Continuous casting process slab easily forms center segregation, seriously affects the performance uniformity of product, while can cause quality gap of cracking,
Also the welding performance of steel can be reduced, while the product is smelted without LF external refining, foreign substance in molten steel content not can guarantee, will
The impact flexibility of product can be brought a negative impact.Meanwhile the invention can only guarantee that -20 DEG C of impact flexibility, can not in 60J or more
Guarantee -40 DEG C of impact flexibility.
A kind of " rare earth of 102337455 A NeiMenggu BaoGang GangLian Co., Ltd of China Patent Publication No. CN application
The high-flexibility wear-resistant steel plate of processing " the invention steel grade is added to rare earth element (RE) 0.01~0.30%, higher cost, and the hair
Bright steel grade only can guarantee -20 DEG C of low-temperature impact work 50J or more, not can guarantee -40 DEG C of low-temperature impact works, i.e., ice box is wanted
The abrasion-resistant stee for -40 DEG C of low-temperature impact requirements asked is unable to get guarantee on the basis of low-cost design.
A kind of " high rigidity high-ductility of 102747282 A Baoshan Iron & Steel Co., Ltd of China Patent Publication No. CN application
Property wear-resisting steel plate and its manufacturing method " the steel C content is 0.36~0.45wt%, it is known that carbon content is higher, will directly dislike
Change the welding performance of steel, while the steel is added to 0.010~0.040% Nb, higher cost.
Based on above for the analysis of the prior art, applicant thinks to provide a kind of with low temperature resistant wear-resisting steel plate and low
The method that cost prepares it is still very necessary.
Summary of the invention
In view of the deficiencies of the prior art, it is an object of the present invention to provide a kind of low residual stress wear-resisting steel plate,
On the basis of meeting surface Brinell hardness HBW340~HBW440, steel plate be not required to carry out tempering, realize low residual stress,
Short route, low cost production and tissue morphology are that integrative organization's performance indicator of martensite needs.
In order to achieve the above objectives, the present invention provides one kind have favorable low-temperature impact toughness wear-resisting steel plate, chemistry at
Point and its weight percentage are as follows: C 0.13~0.20%, Si 0.25~0.60%, Mn 0.4~0.8%, Ni 0.15~
0.35%, Mo 0.1~0.3%, Cr 0.25~0.60%, Ti 0.010~0.035%, P≤0.015%, S≤0.003%,
B 0.0013~0.0030%, Al 0.010~0.050%, H≤0.0002%, N≤0.0035%, surplus are Fe and can not keep away
The field trash exempted from, and Cr and Ni element meets 1.807C+1.077Si+0.797Mn+7.727B >=Cr+Ni >=0.933C+
0.45Si+0.121Mn+0.41B。
As a kind of better choice of above-mentioned wear-resisting steel plate, the ratio of retained austenite is 5-8% in the wear-resisting steel plate.
Wherein, the effect of various elements is as follows in the present invention:
C: is affected to armor plate strength, hardness, toughness and its harden ability, higher C content will increase steel intensity,
Hardness and harden ability, but deterioration effect is generated to toughness.Therefore, in the present invention, range of the C content control 0.13~0.20%
It is interior.
Si: silicon is dissolved in ferrite and austenite in steel, can significantly improve the intensity and hardness of steel.In addition, silicon can be molten
In Fe3C keeps cementite unstable, hinders the precipitation and aggregation of cementite, therefore silicon has the analysis of strong inhibition carbide in steel
Effect out guarantees the stability of retained austenite, needs in steel to guarantee that carbon can be distributed from martensite to retained austenite
A certain amount of silicon is added, in martensite wear resistant steel, when silicone content is very little, cannot effectively inhibit the precipitation of carbide；When too high, hold
It is also easy to produce temper brittleness.In addition, oxidation when silicon can reduce frictional heating, the flow harden rate of steel and wear-resisting is mentioned
Property, it is therefore preferred that the control of Si content is in the range of 0.25~0.60%.
Mn: the toughness of steel, intensity, hardness can be increased, and improve the harden ability of steel, improve the hot-working character of steel；
But manganese segregation with higher tendency, therefore manganese content is not easy excessively high, while manganese content is excessively high can also weaken the anticorrosive of steel
Ability reduces welding performance.It is therefore preferred that the control of Mn content is in the range of 0.4~0.8%.
P and S: it is the harmful element in steel, the brittleness of steel can be influenced.Sulphur can form plastic occluded foreignsubstance vulcanization in steel with manganese
Manganese, horizontal plastic property and toughness to steel plate have larger impact；Phosphorus also seriously affects the plasticity and toughness of steel plate simultaneously.Change speech
It, for the present invention, the lower the content of p and s the better, but in the actual production process, p and s are inevitable,
It is therefore preferred that P content≤0.015%, S content≤0.003%.
Mo: molybdenum is present in solid solution phase in steel, can effectively improve harden ability；When molybdenum content is lower, with iron and carbon
Compound cementite is formed, when content is higher, then forms oneself special carbide；Generally speaking, molybdenum can improve the through hardening of steel
Property, improve heat resistance, prevent temper brittleness, in order to further increase the intensity and wearability of steel, take molybdenum content be Mo 0.1~
0.3%.
Ni: it can be improved the toughness of steel, can especially improve the low-temperature flexibility of steel.It is therefore preferred that the control of Ni content exists
In 0.15~0.35%.
Ti: can form tiny containing titaniferous compound with carbon, nitrogen, and austenite grain is thick during continuous casting billet can be hindered to reheat
Change and then refine crystal grain, the welding performance of steel plate can be improved, while Ti is also ferritizing strengthening element, can be solid-solution in ferrite
Ferritic intensity is improved, invigoration effect is higher than Al, Mn, Ni and Mo etc..It is therefore preferred that the control of Ti content exists
In the range of 0.010~0.035%.
Cr: chromium is one of main alloy element of wear-resistant material, is partially soluble in solid solution, improves the harden ability of steel, is strengthened
Matrix can greatly improve the harden ability of steel when especially cooperating with silicon, manganese.Since solubility of the chromium in austenite is larger, quench
Largely be dissolved in martensite after fire, and chromium containing carbide can be precipitated in subsequent drawing process, can be improved steel intensity and
Hardness.Increase its anticorrosive energy since solution strengthening matrix, thinning microstructure are remarkably improved the oxidation resistance of steel again simultaneously
Power.Therefore, Cr content is preferably controlled in the range of 0.25~0.60%.
B: can improve the compactness and hot rolling performance of steel plate, improve steel plate harden ability, improve intensity.In the present invention, B contains
Amount control is in the range of 0.0013~0.0030%.
Al: main function be deoxidation, crystal grain can be refined in steel, improves the impact flexibility of steel plate.But aluminium content
The excessively high oxide that will lead to aluminium is mingled with increase, reduces the degree of purity of steel, while having an effect on the hot-working character of steel, weldability
Energy.Therefore, Al content of the invention controls in the range of 0.010~0.050%.
H: the hydrogen embrittlement as caused by hydrogen and white point are the common deficiencies of medium-thick plate, be easy to cause the intensity of steel, especially steel
Plasticity and toughness be remarkably decreased, so that steel is become fragile and be easy to crack, hydrogen be also in steel white point generate basic reason.Therefore, this hair
It is bright to require hydrogen content≤0.0002%.
N: nitrogen is very important intensified element in steel, and crystallization and recrystal grain can mutually be hindered by being solid-solution in matrix in steel
Grow up, play the role of refined crystalline strengthening；It can also be mentioned with the other alloying elements or microalloy element formation nitride in steel
The intensity and wearability of Gao Gang.Excessive nitrogen is very unfavorable to the performance especially welding performance of steel in steel, but is controlled
Sternly it will increase dramatically production cost, therefore, the present invention claims nitrogen contents≤0.0035%.
As a kind of better choice of above-mentioned wear-resisting steel plate, the ratio of retained austenite is 5-8% in the wear-resisting steel plate.
It is another object of the present invention to provide a kind of preparation method with favorable low-temperature impact toughness wear-resisting steel plate,
Method provided by the invention the following steps are included:
1) it smelts: molten steel is vacuum-treated through desulfurization, pneumatic steelmaking, LF refining, vacuum degassing furnace；
2) cast: by step 1) treated molten steel send conticaster, continuous casting is using whole argon gas protective casting；
3) it heating of plate blank: is rolled after being heated to 1180 DEG C~1240 DEG C；
4) it rolls: completing finish rolling, roughing two-phase control rolling using wide and heavy plate mill, roll rear water cooling；
5) slow cooling: steel plate, which enters, cheats slow cooling, and slow cooling temperature is not less than 300 DEG C；
6) it is heat-treated: being quenched after being heated to complete austenitizing through quenching press, then carry out tempering.
As a kind of better choice of the above method, the step 1) smelting procedure is by molten steel through desulfurization, pneumatic steelmaking
Bottom blowing whole process blowing argon gas, LF refining, vacuum degassing furnace are vacuum-treated, and LF refining finishing slag basicity is controlled 2.3~3.5.
As a kind of better choice of the above method, the step 2) casting process is that treated that molten steel is sent by step 1)
Conticaster, continuous casting is using whole argon gas protective casting.
As a kind of better choice of the above method, step 3) slab processing sequence be heating of plate blank to 1180 DEG C~
It is rolled after 1240 DEG C.
As a kind of better choice of the above method, the step 4) rolling process is to complete essence using wide and heavy plate mill
It rolls, roughing two-phase control rolling, finishing temperature is 870 DEG C~980 DEG C, rear water cooling rolled, opens 770~850 DEG C of cold temperature, cooling rate 8~
18 DEG C/s, 380~550 DEG C of final cooling temperature.
As a kind of better choice of the above method, the step 5) slow cooling operation is that steel plate enters burial pit progress slow cooling,
Slow cooling start temperature is not less than 300 DEG C, and slow cooling time is 36~48 hours, and steel plate is kept the temperature after entering hole using asbestos.
As a kind of better choice of the above method, the step 6) heat treatment procedure is after being heated to complete austenitizing
The machine of being quenched is quenched, then carries out tempering.Steel plate quenching temperature is 860~910 DEG C, time inside furnace 1.5~
3.5hmin/mm, h are steel plate thickness；Tempering temperature is 150~250 DEG C, and time inside furnace 2.5~4.0hmin/mm, h are that steel plate is thick
Degree, it is air-cooled after tempering.Wherein, 1 line of quenching press high pressure section, 3 lines, 4 lines, 6 lines, 7 lines, 9 lines, 10 lines, 12 line waters be 30~
50m3/h；2 line of quenching press high pressure section, 5 lines, 8 lines, 11 line waters are 520~640m3/h；13 line water of quenching press high pressure section is
330~380m3/h；14 line water of quenching press high pressure section is 420~490m3/h。
Carbon and alloying element content are devised due to scientific and reasonable in the present invention, the refinement for passing through microalloy element is strengthened
The heat treatment process of the refinement strengthening effect of effect and controlled rolling and controlled cooling process, the distribution of reasonable carbon and science, so that steel
Plate obtains optimal retained austenite and tempered martensite complex tissue form, have both while with high rigidity it is excellent-
40 DEG C of low-temperature impact toughness.
As a kind of better choice of above-mentioned wear-resisting steel plate, the ratio of retained austenite is 5-8% in the wear-resisting steel plate.
Design principle of the invention is: the presence of retained austenite can increase crack growth resistance in abrasion-resistant stee, improve
Its overall flexibility.Control abrasion-resistant stee rolls rear temperature and is in complete austenitizing in process of production, and subsequent rapid quenching to Ms~
380~550 DEG C of temperature between Mf form it into martensite and the retained austenite of certain volume score, then pass through offline heat
Treatment furnace is heated in initial hardening heat, is kept the temperature, then is quenched to room temperature.It is distributed in insulating process according to the technique carbon, martensite
In carbon atom will be spread to retained austenite due to the difference of carbon potential, retained austenite can stablize due to rich carbon to room
Temperature finally obtains the line and staff control of high carbon martensite, low-carbon martensite and retained austenite, and wherein retained austenite phase accounting exists
5%~8%.Martensite and alloying element solution strengthening effect make it have higher in organizing after production technology processing of the present invention
Hardness；The reduction of carbon content and the increase of residual austenite content make it have higher plasticity and toughness, therefore this hair in martensite
Open-birth production. art realizes the cooperation of higher hardness and toughness.Therefore compared with general martensite wear resistant steel, the present invention can
Superior comprehensive performance is obtained, -40 DEG C of low-temperature impact toughness are more preferably when especially showing Brinell hardness HBW360~HBW460.
In order to better meet user to the requirement of 30-60mm wear-resisting steel plate, while meeting good hardness and -40 DEG C
Low-temperature impact toughness requirement, the invention discloses one kind to have favorable low-temperature impact toughness wear-resisting steel plate, the product and production skill
The wear-resisting steel plate that art meets HBW360~HBW460 hardness section has -40 DEG C of low-temperature impact works and reaches the long-acting of 50J or more
Requirement.
The present invention utilizes 4300mm Wide and Thick Slab double stand reversing two-phase control rolling technology, rolls rear water cooling and heat preservation slow cooling,
It is effectively controlled carbon distribution, using high-precision quenching heat treatment technology, obtains high carbon martensite, low-carbon martensite and remnants
30~60mm of line and staff control's form of austenite have favorable low-temperature impact toughness wear-resisting steel plate, hardness be HBW360~
HBW460, -40 DEG C of low-temperature impact works reach 50J or more, excellent combination property, and preparation method is simple and practical.
The difference of the present invention and the prior art is mainly reflected in following several respects:
It is chemically seen on ingredient, the chemical component of abrasion-resistant stee of the present invention is in addition to the elements such as C, Si, Mn, Cr, B, no
The microalloy elements element such as expensive Nb, V is added, has the characteristics that cost of alloy is cheap；
From tissue morphology, wear-resisting steel plate of the present invention obtains high carbon martensite, low-carbon martensite and remnants
Line and staff control's form of austenite, the intensity and hardness of martensite steel depend on martensitic matrix, and its plasticity depends on horse
The deformability of family name's body matrix and the volume fraction of retained austenite.It is difficult to understand by the martensite and remnants that form certain volume score
Family name's body both ensure that the intensity and hardness of steel, and also ensure good low-temperature impact toughness；
From properties of product, abrasion-resistant stee due to its hardness in HBW330 or more tensile strength in 1000MPa or more, it is existing
Technological means can substantially meet -20 DEG C of low-temperature impact toughness requirements, -40 DEG C of low-temperature impacts requirement required for ice box
Abrasion-resistant stee guarantee is unable to get on the basis of low-cost design.And wear-resisting steel plate of the present invention by creative and
The high-intensitive, high rigidity that innovative ingredient and technological design has has both -40 DEG C of excellent ballistic works greater than 50J；
It is of the present invention that there is obvious advantage with favorable low-temperature impact toughness wear-resisting steel plate.Research and development low cost,
The inexorable trend that mechanical property is good, simple process abrasion-resistant stee is social economy and development of iron & steel industry.
Specific embodiment
Following embodiment is described in further detail the contents of the present invention, and protection scope of the present invention includes but unlimited
In following embodiments.
Embodiment 1
1, one kind has favorable low-temperature impact toughness wear-resisting steel plate and preparation method thereof, wherein the chemical component quality hundred of steel
Divide and compare content are as follows: C 0.15%, Si 0.35%, Mn 0.60%, P 0.013%, S 0.002%, Ti 0.015%, Ni
0.23%, Cr 0.40%, Mo 0.12%, B 0.0020%, Al 0.015%, N 0.0020%, H 0.0001%, remaining contains
Amount is Fe and inevitable field trash.
2, above-mentioned that there is favorable low-temperature impact toughness wear-resisting steel plate and preparation method thereof, it successively include smelting, casting, slab
Heating, roughing, finish rolling, heat treatment procedure:
(1) smelting procedure: molten iron needs desulfurization process before entering converter, and converter smelting mode is added using whole nitrogen flushing, alloy
It adds the complete LF refining furnace that is re-fed into refine, refining finishing slag basicity is 2.5, and refining finishes at feeding vacuum drying oven progress vacuum outgas
Reason.
(2) casting process: carrying out continuous casting using conticaster, true using soft reduction technique using whole argon gas protective casting
Protect Inner Quality of Billet.
(3) heating of plate blank process: heating of plate blank is rolled to 1220 DEG C.
(4) rolling process: two-phase control rolling is completed using 4300mm wide and heavy plate mill, finish rolling start rolling temperature is 970 DEG C, eventually
Roll 900 DEG C of temperature, roll rear water cooling, open cold temperature be 840 DEG C, cooling rate be 16 DEG C/s, 540 DEG C of final cooling temperature.
(5) slow cooling: steel plate enters burial pit and carries out slow cooling, and slow cooling start temperature is 380 DEG C, and slow cooling time is 46 hours, steel
Plate is kept the temperature after entering hole using asbestos；
(6) heat treatment procedure: 870 DEG C of hardening heat, time inside furnace 51min；Tempering temperature is 160 DEG C, time inside furnace
78min, steel plate are air-cooled after coming out of the stove.1 line of quenching press high pressure section, 3 lines, 4 lines, 6 lines, 7 lines, 9 lines, 10 lines, 12 line waters are 30m3/
h；2 line of quenching press high pressure section, 5 lines, 8 lines, 11 line waters are 530m3/h；13 line water of quenching press high pressure section is 340m3/h；Quenching
14 line water of machine high pressure section is 430m3/h。
3, through above-mentioned operation, 30mm thickness wear-resisting steel plate is obtained, the surface Brinell hardness of the wear-resisting steel plate is 375HB, -40
DEG C low-temperature impact work is 76J.
Embodiment 2
1, one kind has favorable low-temperature impact toughness wear-resisting steel plate and preparation method thereof, wherein the chemical component quality hundred of steel
Divide and compare content are as follows: C 0.20%, Si 0.39%, Mn 0.70%, P 0.012%, S 0.001%, Ti 0.020%, Ni
0.30%, Cr 0.55%, Mo 0.22%, B 0.0025%, Al 0.018%, N 0.0022%, H 0.0001%, remaining contains
Amount is Fe and inevitable field trash.
2, above-mentioned that there is favorable low-temperature impact toughness wear-resisting steel plate and preparation method thereof, it successively include smelting, casting, slab
Heating, roughing, finish rolling, heat treatment procedure:
(1) smelting procedure: molten iron needs desulfurization process before entering converter, and converter smelting mode is added using whole nitrogen flushing, alloy
It adds the complete LF refining furnace that is re-fed into refine, refining finishing slag basicity is 2.8, and refining finishes at feeding vacuum drying oven progress vacuum outgas
Reason.
(2) casting process: carrying out continuous casting using conticaster, true using soft reduction technique using whole argon gas protective casting
Protect Inner Quality of Billet.
(3) heating of plate blank process: heating of plate blank is rolled to 1210 DEG C.
(4) rolling process: two-phase control rolling is completed using 4300mm wide and heavy plate mill, finish rolling start rolling temperature is 920 DEG C, eventually
Roll 910 DEG C of temperature, roll rear water cooling, open cold temperature be 850 DEG C, cooling rate be 8 DEG C/s, 400 DEG C of final cooling temperature.
(5) slow cooling: steel plate enters burial pit and carries out slow cooling, and slow cooling start temperature is 350 DEG C, and slow cooling time is 40 hours, steel
Plate is kept the temperature after entering hole using asbestos；
(6) heat treatment procedure: 910 DEG C of hardening heat, time inside furnace 192min；Tempering temperature is 200 DEG C, time inside furnace
228min, steel plate are air-cooled after coming out of the stove.1 line of quenching press high pressure section, 3 lines, 4 lines, 6 lines, 7 lines, 9 lines, 10 lines, 12 line waters are
40m3/h；2 line of quenching press high pressure section, 5 lines, 8 lines, 11 line waters are 620m3/h；13 line water of quenching press high pressure section is 370m3/
h；14 line water of quenching press high pressure section is 475m3/h。
3, through above-mentioned operation, 60mm thickness wear-resisting steel plate is obtained, the surface Brinell hardness of the wear-resisting steel plate is 455HB, -40
DEG C low-temperature impact work is 55J.
Embodiment 3
1, one kind has favorable low-temperature impact toughness wear-resisting steel plate and preparation method thereof, wherein the chemical component quality hundred of steel
Divide and compare content are as follows: C 0.19%, Si 0.42%, Mn 0.65%, P 0.014%, S 0.003%, Ti 0.022%, Ni
0.28%, Cr 0.50%, Mo 0.20%, B 0.0023%, Al 0.020%, N 0.0030%, H 0.00015%, remaining
Content is Fe and inevitable field trash.
2, above-mentioned that there is favorable low-temperature impact toughness wear-resisting steel plate and preparation method thereof, it successively include smelting, casting, slab
Heating, roughing, finish rolling, heat treatment procedure:
(1) smelting procedure: molten iron needs desulfurization process before entering converter, and converter smelting mode is added using whole nitrogen flushing, alloy
It adds the complete LF refining furnace that is re-fed into refine, refining finishing slag basicity is 3.0, and refining finishes at feeding vacuum drying oven progress vacuum outgas
Reason.
(2) casting process: carrying out continuous casting using conticaster, true using soft reduction technique using whole argon gas protective casting
Protect Inner Quality of Billet.
(3) heating of plate blank process: heating of plate blank is rolled to 1180 DEG C.
(4) rolling process: two-phase control rolling is completed using 4300mm wide and heavy plate mill, finish rolling start rolling temperature is 940 DEG C, eventually
Roll 920 DEG C of temperature, roll rear water cooling, open cold temperature be 860 DEG C, cooling rate be 10 DEG C/s, 425 DEG C of final cooling temperature.
(5) slow cooling: steel plate enters burial pit and carries out slow cooling, and slow cooling start temperature is 366 DEG C, and slow cooling time is 36 hours, steel
Plate is kept the temperature after entering hole using asbestos；
(6) heat treatment procedure: 900 DEG C of hardening heat, time inside furnace 120min；Tempering temperature is 220 DEG C, time inside furnace
150min, steel plate are air-cooled after coming out of the stove.1 line of quenching press high pressure section, 3 lines, 4 lines, 6 lines, 7 lines, 9 lines, 10 lines, 12 line waters are
45m3/h；2 line of quenching press high pressure section, 5 lines, 8 lines, 11 line waters are 580m3/h；13 line water of quenching press high pressure section is 350m3/
h；14 line water of quenching press high pressure section is 450m3/h。
3, through above-mentioned operation, 50mm thickness wear-resisting steel plate is obtained, the surface Brinell hardness of the wear-resisting steel plate is 430HB, -40
DEG C low-temperature impact work is 61J.
Embodiment 4
1, one kind has favorable low-temperature impact toughness wear-resisting steel plate and preparation method thereof, wherein the chemical component quality hundred of steel
Divide and compare content are as follows: C 0.17%, Si 0.30%, Mn 0.51%, P 0.010%, S 0.001%, Ti 0.032%, Ni
0.33%, Cr 0.40%, Mo 0.13%, B 0.0026%, Al 0.022%, N 0.0028%, H 0.0001%, remaining contains
Amount is Fe and inevitable field trash.
2, above-mentioned that there is favorable low-temperature impact toughness wear-resisting steel plate and preparation method thereof, it successively include smelting, casting, slab
Heating, roughing, finish rolling, heat treatment procedure:
(1) smelting procedure: molten iron needs desulfurization process before entering converter, and converter smelting mode is added using whole nitrogen flushing, alloy
It adds the complete LF refining furnace that is re-fed into refine, refining finishing slag basicity is 3.2, and refining finishes at feeding vacuum drying oven progress vacuum outgas
Reason.
(2) casting process: carrying out continuous casting using conticaster, true using soft reduction technique using whole argon gas protective casting
Protect Inner Quality of Billet.
(3) heating of plate blank process: heating of plate blank is rolled to 1235 DEG C.
(4) rolling process: two-phase control rolling is completed using 4300mm wide and heavy plate mill, finish rolling start rolling temperature is 960 DEG C, eventually
Roll 910 DEG C of temperature, roll rear water cooling, open cold temperature be 820 DEG C, cooling rate be 14 DEG C/s, 540 DEG C of final cooling temperature.
(5) slow cooling: steel plate enters burial pit and carries out slow cooling, and slow cooling start temperature is 416 DEG C, and slow cooling time is 30 hours, steel
Plate is kept the temperature after entering hole using asbestos；
(6) heat treatment procedure: 880 DEG C of hardening heat, time inside furnace 124min；Tempering temperature is 170 DEG C, time inside furnace
152min, steel plate are air-cooled after coming out of the stove.1 line of quenching press high pressure section, 3 lines, 4 lines, 6 lines, 7 lines, 9 lines, 10 lines, 12 line waters are
35m3/h；2 line of quenching press high pressure section, 5 lines, 8 lines, 11 line waters are 560m3/h；13 line water of quenching press high pressure section is 345m3/
h；14 line water of quenching press high pressure section is 446m3/h。
3, through above-mentioned operation, 40mm thickness wear-resisting steel plate is obtained, the surface Brinell hardness of the wear-resisting steel plate is 410HB, -40
DEG C low-temperature impact work is 80J.
It can be seen that by embodiment 1-4 and corresponding testing result according to present component design, rolling mill practice, water cooling
Technique and heat treatment process require wear-resisting steel plate produced, and between HBW360-460, -40 DEG C of low-temperature impact works are hardness
50J or more realizes the manufacture that 30~60mm has favorable low-temperature impact toughness wear-resisting steel plate, and production technology is advanced, preparation side
Method is simple and practical, better meets user using expectation, has filled up the country using product manufactured by production technology of the invention
Blank, therefore, wear-resisting steel plate of the invention have obvious advantage.
Technological parameter (such as temperature, time) section bound value of the invention and interval value can realize this law,
Embodiment numerous to list herein.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, it will be apparent to an ordinarily skilled person in the art that technical side of the invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Scope of the claims in.
Claims (9)
1. one kind has low-temperature impact toughness wear-resisting steel plate, which is characterized in that the chemical component and weight percent of the steel plate contain
Measuring is C 0.13~0.20%, Si 0.25~0.60%, Mn 0.4~0.8%, Ni 0.15~0.35%, Mo 0.1~
0.3%, 0.25~0.60% Cr, Ti 0.010~0.035%, P≤0.015%, S≤0.003%, B 0.0013~
0.0030%, Al 0.010~0.050%, H≤0.0002%, N≤0.0035%, surplus are Fe and are inevitably mingled with
Object, and Cr and Ni element meets 1.807C+1.077Si+0.797Mn+7.727B >=Cr+Ni >=0.933C+0.45Si+
0.121Mn+0.41B；Brinell hardness HBW360~HBW460, -40 DEG C of ballistic works are 50J or more, and tissue morphology is residual austenite
Body+tempered martensite；
The preparation method of the steel plate includes slow cooling operation and heat treatment procedure:
The slow cooling operation is that the steel plate after rolling enters burial pit and carries out slow cooling, and slow cooling start temperature is not less than 300 DEG C, when slow cooling
Between be 36~48 hours, steel plate enter hole after kept the temperature using asbestos；
The heat treatment procedure is to be quenched after being heated to complete austenitizing through quenching press, then carry out tempering；
The ratio of retained austenite is 5-8% in the wear-resisting steel plate.
2. as described in claim 1 a kind of with low-temperature impact toughness wear-resisting steel plate, which is characterized in that the thickness of the steel plate
Specification is 30~60mm.
3. a kind of described in any item preparation methods with low-temperature impact toughness wear-resisting steel plate of claim 1-2, including it is following
Step:
1) it smelts: molten steel is vacuum-treated through desulfurization, pneumatic steelmaking, LF refining, vacuum degassing furnace；
2) cast: by step 1) treated molten steel send conticaster, continuous casting is using whole argon gas protective casting；
3) it heating of plate blank: is rolled after being heated to 1180 DEG C~1240 DEG C；
4) it rolls: completing finish rolling, roughing two-phase control rolling using wide and heavy plate mill, roll rear water cooling；
5) slow cooling: steel plate, which enters, cheats slow cooling, and slow cooling temperature is not less than 300 DEG C；Steel plate enters burial pit and carries out slow cooling, slow cooling start temperature
Not less than 300 DEG C, slow cooling time is 36~48 hours, and steel plate is kept the temperature after entering hole；
6) it is heat-treated: being quenched after being heated to complete austenitizing through quenching press, then carry out tempering；The steel plate quenching
Temperature is 860~910 DEG C, and time inside furnace 1.5~3.5hmin/mm, h are steel plate thickness；Tempering temperature is 150~250 DEG C,
The furnace time, 2.5~4.0hmin/mm, h were steel plate thickness, air-cooled after tempering.
4. preparation method as claimed in claim 3, which is characterized in that in the step 1), refining finishing slag basicity control is 2.3
~3.5.
5. preparation method as claimed in claim 3, which is characterized in that in the step 4), 870 DEG C of finish rolling finishing temperature~
980 DEG C, rear water cooling is rolled, opens 770~850 DEG C of cold temperature, 8~18 DEG C/s of cooling rate, 380~550 DEG C of final cooling temperature.
6. preparation method as claimed in claim 3, which is characterized in that in the step 6), 1 line of quenching press high pressure section, 3 lines, 4
Line, 6 lines, 7 lines, 9 lines, 10 lines, 12 line waters are 30~50m3/h。
7. preparation method as claimed in claim 3, which is characterized in that in the step 6), 2 line of quenching press high pressure section, 5 lines, 8
Line, 11 line waters are 520~640m3/h。
8. preparation method as claimed in claim 3, which is characterized in that in the step 6), 13 line water of quenching press high pressure section
For 330~380m3/h。
9. preparation method as claimed in claim 3, which is characterized in that in the step 6), 14 line water of quenching press high pressure section
For 420~490m3/h。
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| CN108486475A (en) * | 2018-05-23 | 2018-09-04 | 山东钢铁股份有限公司 | A kind of think gauge wear-resisting steel plate and preparation method thereof with good centre hardness |
| CN109609843A (en) * | 2018-12-11 | 2019-04-12 | 山东钢铁股份有限公司 | Think gauge wear-resisting steel plate and preparation method thereof in a kind of low residual stress |
| CN109811259A (en) * | 2019-01-25 | 2019-05-28 | 南京钢铁股份有限公司 | A kind of ultralow temperature wear-resisting steel plate and manufacturing method |
| CN109811260A (en) * | 2019-01-25 | 2019-05-28 | 南京钢铁股份有限公司 | A kind of extremely cold area wear-resisting steel plate and manufacturing method |
| CN110438407B (en) * | 2019-09-16 | 2020-11-03 | 益阳紫荆福利铸业有限公司 | Alloy steel and preparation method and application thereof |
| CN110863135B (en) * | 2019-10-30 | 2021-04-02 | 鞍钢股份有限公司 | High-nickel steel for low-temperature container and manufacturing method thereof |
| CN110952023B (en) * | 2019-11-07 | 2021-06-22 | 包头钢铁（集团）有限责任公司 | Rare earth treated high-toughness 1100 MPa-grade steel plate and preparation method thereof |
| CN111910125B (en) * | 2020-08-03 | 2021-05-28 | 鞍钢股份有限公司 | Non-heat-treatment wear-resistant steel bar for bar mill and manufacturing method thereof |
| CN112322976A (en) * | 2020-10-30 | 2021-02-05 | 包头钢铁（集团）有限责任公司 | Rare earth wear-resistant steel NM400 coiled plate with excellent low-temperature-resistant toughness and production method thereof |
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