CN106544591B - Ultrahigh-intensity high-toughness carbides-free bainite wear resistant steel plate and preparation method thereof - Google Patents
Ultrahigh-intensity high-toughness carbides-free bainite wear resistant steel plate and preparation method thereof Download PDFInfo
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Abstract
A kind of ultrahigh-intensity high-toughness non-carbide bainitic steel, chemical composition mass percent wt% are：C：0.4~0.5, Si：1.8~2.2, Mn：1.8~2.2, Cr：1.0~1.5, W：0.1~0.3, V：0.001~0.003, Al：0.1~0.3, Re：0.001~0.003, Ca：0.001~0.003, B：0.0001~0.0003, N：0.002~0.005, Mg：0.001~0.005, remaining is Fe and a small amount of impurity element；The preparation method of above-mentioned bainitic steel is mainly：Continuous casting steel billet → de-scaling → rolling → stress relief annealing；The heat treatment of steel plate：900~950 DEG C of austenitizing 1~3h of isothermal are heated to, 400 DEG C, 2~5min of isothermal are cooled to 80~100 DEG C/min, Ms temperature 2~5min of isothermal are cooled down with 5~10 DEG C/min, room temperature is then cooled to 10~20 DEG C/min.Bainitic steel tensile strength prepared by the present invention is more than 2300MPa, and room temperature impact toughness is more than 35J/cm2, hardness is more than HRC58, with excellent wear-resisting property.
Description
Technical field
The invention belongs to Materials Science and Engineering field, more particularly to a kind of wear-resisting steel plate and preparation method thereof.
Background technology
In recent decades, quickly, this kind of steel is in low-alloy high-strength for the exploitation of high-strength abrasion-proof steel plate and application development
On the basis of grow up, wear-resisting property is good, service life up to traditional structure steel plate several times, also, its production technology compared with
Simply, general fiery using rear direct quenching add-back is rolled, or strengthened by controlled rolling, the cold technique of control, become abrasion-resistant stee of new generation
Representative.Currently, the wear-resisting steel plate trade mark is more in the world, there have been the series production of oneself in some iron companies of developed country
Product and standard.As the Hardox of Sweden's Losec Longde is serial, Thyssen Krupp Xar is serial, Japan JFE Everhard
Series etc..These enterprises produce wear-resisting steel plate since the 50-60 ages in 20th century, can stablize at present supply thickness 6~
Each rank wear-resisting steel plate product of 100mm, HB300~600.Sweden's Losec Longde in 2007 is proposed maximum intensity in the world
Hardox Extreme wear-resisting steel plates, reach HB700 intensity ranks.China start to walk in terms of the exploitation of high-strength abrasion-proof steel compared with
Evening, nearly 10 years China pass through foreign the relevant technologies, the equal energy of the Heavy Plate Plants such as Wuhan Iron and Steel Plant, Anshan iron and steel plant, Baosteel, Wuyang, Taiyuan Iron and Steel Co., new steel
Enough to stablize supply HB400 intensity ranks wear-resisting steel plate below, part of the manufacturer can produce the wear-resisting steel plate of HB500 intensity ranks.
However, China's wear-resisting steel plate product strength rank, performance also have larger gap, HB450 or more intensity compared with external product
Rank abrasion-resistant stee still relies primarily on import.In recent years, researcher has invented some wear-resisting steel plate steel and its manufacture in succession
Technology.Such as：Chinese patent " a kind of process for preparing bainite antiwear steel plate CN200510025978.4 ", the chemical composition of steel plate
(wt%) it is：C0.18-0.40, Si0.4-1.2, Mn1.5-2.5, Mo≤0.8, Cr≤1.0, alterant 0.05-0.2.Pass through
The ingredient and multicomponent microalloying of reasonable design are handled.Rolling mill practice is：Breaking down temperature is 1050-1150 DEG C, and finishing temperature is
840-920 DEG C, it is cold to roll rear air-cooled or heap.It can obtain that metallographic structure is uniform, wear-resisting property is good and has by rolling deformation
The rolling state air-colled bainite steel plate of good solderability, increases substantially the service life of blade board.Japanese United States Patent (USP)
" high-flexibility wear-resistant steel US6,899,774 ", the chemical composition (wt%) of steel plate：C0.21-0.80、Al0.5-2.0、Ni0.5-
4.0, and contain Si, Mn, Cr, Mo, W, V, Ti, Cu and B element, control the content of P, S, N and O element.Chinese patent " high-ductility
Property ultrahigh-strength wear-resistant steel plate and its production method CN200910013285.1 ", the chemical composition (wt%) of wear-resisting steel plate are：
C0.15-0.26、Si0.20-0.55、Mn1.0-1.60、Mo0.0-0.6、Ni 0.0-0.5、Cr0.2-1.0、Ti 0.01-
0.05、Als 0.02-0.04、B 0.0005-0.004.Production method includes：High Clean Steel Melts smelting-desulfurizing iron-converter top
Bottom top-bottom blowing-vacuum processing-strand, especially heating of plate blank-roughing-finish rolling, the control of heat treatment process parameter.In
State's patent " a kind of carbides-free bainite wear resistant steel plate and its production technology CN200810021697.5 ", wear-resisting steel plate composition
(wt%) it is：C0.15-0.25、Mn1.5-2.0、Si1.3-2.0、Al0.2-0.6、Cr0.6-1.0、Mo：0.25-0.50、
Nb0.01-0.035.Production technology is：Continuous casting plate is heated；Continuous casting steel billet after heating is subjected to controlled rolling and controlled cooling rolling；Rolling
Lonneal is handled in being carried out to rolled plate after complete.Carbides-free bainite wear resistant steel can be produced by the above process
Plate can not only simplify production process without carrying out online or offline Tempering and Quenching, but also can enhance product performance and product matter
Amount, obtains the Bainite wear-resisting steel of high-intensity and high-tenacity.Chinese patent " a kind of manufacturing method and heat of hot rolling high-strength wearable steel plate
Roll high-strength wearable steel plate CN201510031599.X ", Plate Production technological process：Continuous casting steel billet → de-scaling → roughing → finish rolling →
Section cooling, 300 DEG C -500 DEG C of slab charging temperature, heating of plate blank section temperature are 1270 DEG C -1290 DEG C, and soaking zone temperature is
1290 DEG C -1300 DEG C, tapping temperature is 1290 DEG C -1300 DEG C, heating time 180min-240min；R1 a time roll and
R1 a time de-scalings, five passes of R2 and R2 a time de-scalings, R2 outlet temperatures are 1090 DEG C -1130 DEG C, and wherein R1 is indicated
First roughing mill, R2 indicate the second roughing mill；Use that coiled sheet case batches and intermediate base head and tail temperature difference is 20 DEG C -50 DEG C；Using 7 machines
Frame continuous rolling, and finishing temperature is 890 DEG C -930 DEG C；Section cooling uses leading portion refrigerating mode；Coiling temperature be 530 DEG C-
570℃.Chinese patent " a kind of ultrahigh-strength wear-resistant steel plate and its production method CN201410505809.X ", the chemistry of steel plate at
Point (wt%) is：C0.35-0.40、Si0.4-0.6、Mn0.4-1.0、Cr0.8-1.8、Mo0.2-0.6、Nb0.01-0.03、
Ni0.0-0.6、Cu0.0-0.6、B0.0005-0.0022、Ti0.025-0.04、Als0.025-0.045.Impurity element therein
Control：[N]≤0.0080%, [O]≤0.0020%, and Ti/N >=3.4.The maximum gauge of wear-resisting steel plate is up to 120mm；It is not required to
Tempering heat treatment；- 40 DEG C of low-temperature flexibilities are more than 20J.Chinese patent " a kind of novel wear resistant steel plate and its production method
The ingredient (wt%) of CN201510905348.X ", steel plate is：C0.03-0.20、Si0.2-0.4、Mn3.5-6.0、Ti0.002-
0.020, Mo≤0.20%, Al≤0.055%.Production technology includes：Smelting process, continuous casting process, heating process, rolling, heat
Treatment process.It produces with high low-temperature flexibility and high rigidity, the wear-resisting steel plate with good wearability and long-life.In
State's patent " a kind of production method CN201510227326.2 of high-strength high-toughness wear-resistant steel plate ", the chemical composition of wear-resisting steel plate
Mass percent is：C0.15-0.26、Si0.20-0.55、Mn1.0-1.6、Mo0.0-0.6、Ni0.0-0.5、Cr0.2-1.0、
Ti0.01-0.05、Als0.02-0.04、B0.0005-0.004.The technological process of production：High Clean Steel Melts smelting-desulfurizing iron-
Converter top bottom blowing-vacuum processing-strand.Chinese patent " a kind of high-performance Economical wear-resistant steel plate and its preparation side
The chemical composition (wt%) of method CN201510068137.5 ", wear-resisting steel plate is：C0.2-0.3、Si1.6-1.8、Mn0.3-0.6、
Ti0.0-0.03、Cr0.2-0.5、Ni：0.0-0.3、Mo：0.05-0.20、B：0.001-0.003.Preparation method include smelt,
Casting, slab shove charge, heating of plate blank, rolling and heat treatment procedure.This wear-resisting steel plate product hardness reaches HBW430-480
Rank.Chinese patent " bainite-martensite-austenite multi-phase wear-resistant steel plate and manufacturing method CN201410743570.X ", steel
The chemical composition (wt%) of plate is：C0.2-0.4、Mn0.3-1.5、Si0.8-1.2、Cr0.6-1.0、Ni0.2-0.6、Mo0.2-
0.4、Cu0.2-0.5；B0.0005-0.003.Manufacturing method is：Converter or electric furnace smelting, casting, are heated, are rolled at external refining
System, cooling, heat treatment.Bainite-martensite-retained austenite heterogeneous structure, retained austenite volume fraction can be obtained in stocking
5-15%, the hardness HB420-500 of steel plate, abrasive wear wearability reach 1.3 times of Hardox450 or more, weak acid environment
Reach 1.5 times or more of Hardox450 under operating mode.All contain precious metal substantially in the chemical composition of the steel of these patent achievements
Nickel causes the cost of raw material of wear-resisting steel plate higher；Importantly, the hardness of these wear-resisting steel plates is substantially below HB500,
HB600 levels are not reached.
Invention content
The ultrahigh-intensity high-toughness carbides-free that the purpose of the present invention is to provide a kind of wear-resisting properties is good, manufacturing cost is low
Bainite antiwear steel plate and preparation method thereof.
The ultrahigh-intensity high-toughness non-carbide bainitic steel of the present invention is that a kind of ultra-fine carbides-free continuously changed is multiple
Bainite structure is closed, wherein upper bainite accounting is 20~25%, lower bainite accounting 60~65%, and retained austenite accounting is
10~15%, chemical composition mass percent wt% are：C：0.4~0.5, Si：1.8~2.2, Mn：1.8~2.2, Cr：1.0
~1.5, W：0.1~0.3, V：0.001~0.003, Al：0.1~0.3, Re：0.001~0.003, Ca：0.001~0.003,
B：0.0001~0.0003, N：0.002~0.005, Mg：0.001~0.005, remaining is Fe and a small amount of impurity element.
The preparation method of above-mentioned ultrahigh-intensity high-toughness non-carbide bainitic steel：
(1) by the continuous casting steel billet of mentioned component 1400~1500 DEG C of temperature range cooling velocities be 350~450 DEG C/
min；After 950~1000 DEG C of temperature ranges keep the temperature 4~6h, de-scaling processing is carried out to slab；
(2) by the Rolled From Continuous Casting Slab steel plate of step (1), breaking down temperature is 1150~1200 DEG C, finishing temperature is 860~
920℃；It rolls rear air-cooled；It is heated to 600~650 DEG C of 4~6h of heat preservation and carries out stress relief annealing process；
(3) steel plate of step (2) is heated to 900~950 DEG C of austenitizings and keeps the temperature 1~3h, it is cold with 80~100 DEG C/min
But speed is cooled to 400 DEG C, 2~5min of isothermal, is cooled to Ms temperature 2~5min of isothermal with 5~10 DEG C/min cooling velocities, so
Room temperature is cooled to 10~20 DEG C/min afterwards；After being heated to 100~120 DEG C of 0.5~1.0h of isothermal, continue to be heated to 260~
290 DEG C of 2~3h of isothermal carry out tempering and stabilization of austenite processing.
The present invention has the following advantages that compared with needing technology：
The ultrahigh-intensity high-toughness bainitic steel tensile strength of preparation is more than 2300MPa, and room temperature impact toughness is more than 35J/
cm2, hardness reaches HB600 or more, and with excellent wear-resisting property, wear-resisting property is more than international foremost wear-resisting steel plate product
Board Hardox600 wear-resisting steel plates are horizontal, however its cost is only the one third of Hardox600.
Description of the drawings
Fig. 1 is the electron microscope of wear-resisting steel plate prepared by the embodiment of the present invention 1.
Fig. 2 is the electron microscope of wear-resisting steel plate prepared by the embodiment of the present invention 3.
Specific implementation mode
Embodiment 1
A kind of ultrahigh-intensity high-toughness non-carbide bainitic steel, it is multiple with a kind of ultra-fine carbides-free continuously changed
Bainite structure is closed, chemical composition mass percent wt% is：C：0.41、Si：2.2、Mn：1.8、Cr：1.5、W：0.10、V：
0.003、Al：0.29、Re：0.001、Ca：0.003、B：0.0003、N：0.002、Mg：0.001, remaining is Fe and a small amount of impurity
Element.The preparation method of this ultrahigh-intensity high-toughness non-carbide bainitic steel plate is that the continuous casting steel billet of mentioned component exists
1400~1500 DEG C of temperature range cooling velocities, 355 DEG C/min；Slab is carried out at de-scaling in 960 DEG C of temperature range heat preservation 6h
Reason；By continuous casting billet milling at steel plate, breaking down temperature is 1150 DEG C, is completed by 4 passes, and finishing temperature is 920 DEG C；It rolls
It is air-cooled afterwards；It is heated to 650 DEG C of heat preservation 4h and carries out stress relief annealing.The heat treatment process of wear-resisting steel plate is to be heated to 900 DEG C of Austria
Family name body isothermal 3h is cooled to 400 DEG C, isothermal 2min with 100 DEG C/min cooling velocities, and Ms is cooled down with 5 DEG C/min cooling velocities
Temperature isothermal 5min, is then cooled to room temperature with 10 DEG C/min.100 DEG C of isothermal 1.0h are heated to, continue to be heated to 290 DEG C etc.
Warm 2h carries out tempering and stabilization of austenite processing.
As shown in Figure 1, ultrahigh-intensity high-toughness non-carbide bainitic steel obtained is the ultra-fine Non-carbonized continuously changed
The compound bainite structure of object, wherein upper bainite accounting is 20%, lower bainite accounting 65%, and retained austenite accounting is
15%.This ultrahigh-intensity high-toughness bainitic steel tensile strength 2320MPa, room temperature impact toughness 41J/cm2, hardness HRC58,
With excellent wear-resisting property.
Embodiment 2
A kind of ultrahigh-intensity high-toughness non-carbide bainitic steel, it is mixed with a kind of ultra-fine carbides-free continuously changed
Bainite structure is closed, chemical composition mass percent wt% is：C：0.49、Si：2.0、Mn：2.2、Cr：1.0、W：0.17、V：
0.001、Al：0.1、Re：0.003、Ca：0.001、B：0.0001、N：0.0045、Mg：0.002, remaining is Fe and a small amount of impurity
Element.The preparation method of this ultrahigh-intensity high-toughness carbide-free Bainite slab is that the continuous casting steel billet of mentioned component exists
1400~1500 DEG C of temperature range cooling velocities, 450 DEG C/min；Slab is carried out at de-scaling in 1000 DEG C of temperature range heat preservation 4h
Reason；By Rolled From Continuous Casting Slab at steel plate, breaking down temperature is 1180 DEG C, is completed by 4 passes, and finishing temperature is 860 DEG C；
It rolls rear air-cooled；It is heated to 600 DEG C of heat preservation 6h stress relief annealings.The heat treatment process of wear-resisting steel plate is to be heated to 950 DEG C of Ovshinskies
Body isothermal 1.5h is cooled to 400 DEG C, isothermal 4min with 80 DEG C/min cooling velocities, and Ms is cooled down with 10 DEG C/min cooling velocities
Temperature isothermal 3min, is then cooled to room temperature with 15 DEG C/min.120 DEG C of isothermal 0.5h are heated to, continue to be heated to 260 DEG C etc.
Warm 3h carries out tempering and stabilization of austenite processing.
Ultrahigh-intensity high-toughness non-carbide bainitic steel obtained is the compound bayesian of ultra-fine carbides-free continuously changed
Body tissue, wherein upper bainite accounting is 25%, lower bainite accounting 65%, and retained austenite accounting is 10%.This superelevation
Strength high toughness bainitic steel tensile strength is more than 2420MPa, room temperature impact toughness 36J/cm2, hardness HRC60, with excellent
Wear-resisting property.
Embodiment 3
A kind of ultrahigh-intensity high-toughness non-carbide bainitic steel, it is mixed with a kind of ultra-fine carbides-free continuously changed
Bainite structure is closed, chemical composition mass percent wt% is：C：0.5、Si：1.9、Mn：2.1、Cr：1.2、W：0.21、V：
0.002、Al：0.22、Re：0.0025、Ca：0.0019、B：0.00019、N：0.005、Mg：0.005, remaining is Fe and a small amount of miscellaneous
Prime element.The preparation method of this ultrahigh-intensity high-toughness non-carbide bainitic steel plate is, by the continuous casting steel billet of mentioned component
In 1400~1500 DEG C of temperature range cooling velocities, 350 DEG C/min；Slab is carried out at de-scaling in 980 DEG C of temperature range heat preservation 5h
Reason；By Rolled From Continuous Casting Slab at steel plate, breaking down temperature is 1180 DEG C, is completed by 4 passes, and finishing temperature is 900 DEG C；
It rolls rear air-cooled；It is heated to 630 DEG C of heat preservation 5h stress relief annealings.The heat treatment process of wear-resisting steel plate is to be heated to 920 DEG C of Ovshinskies
Body isothermal 2h is cooled to 400 DEG C, isothermal 3min with 90 DEG C/min cooling velocities, and Ms temperature is cooled down with 8 DEG C/min cooling velocities
Then isothermal 4min is cooled to room temperature with 15 DEG C/min.110 DEG C of isothermal 0.8h are heated to, continue to be heated to 280 DEG C of isothermals
2.5h carries out tempering and stabilization of austenite processing.
As shown in Fig. 2, ultrahigh-intensity high-toughness non-carbide bainitic steel obtained is the ultra-fine Non-carbonized continuously changed
The compound bainite structure of object, wherein upper bainite accounting are 25%, lower bainite accounting 60%, and retained austenite accounting is
15%.This ultrahigh-intensity high-toughness bainitic steel tensile strength 2450MPa, room temperature impact toughness 38J/cm2, hardness HRC59,
With excellent wear-resisting property.
Embodiment 4
A kind of ultrahigh-intensity high-toughness non-carbide bainitic steel, it is mixed with a kind of ultra-fine carbides-free continuously changed
Bainite structure is closed, chemical composition mass percent wt% is：C：0.45、Si：1.8、Mn：1.9、Cr：1.1、W：0.3、V：
0.003、Al：0.2、Re：0.002、Ca：0.003、B：0.0001、N：0.003、Mg：0.002, remaining is Fe and a small amount of impurity member
Element.The preparation method of this ultrahigh-intensity high-toughness non-carbide bainitic steel plate is that the continuous casting steel billet of mentioned component exists
1400~1500 DEG C of temperature range cooling velocities, 380 DEG C/min；Slab is carried out at de-scaling in 970 DEG C of temperature range heat preservation 5.5h
Reason；By Rolled From Continuous Casting Slab steel plate, breaking down temperature is 1160 DEG C, is completed by 4 passes, and finishing temperature is 910 DEG C；It rolls
It is air-cooled afterwards；It is heated to 610 DEG C of heat preservation 6h stress relief annealings.The heat treatment process of wear-resisting steel plate is to be heated to 940 DEG C of austenites
Change isothermal 2.5h, 400 DEG C, isothermal 5min are cooled to 85 DEG C/min cooling velocities, Ms temperature is cooled down with 10 DEG C/min cooling velocities
Isothermal 3min is spent, room temperature is then cooled to 20 DEG C/min.120 DEG C of isothermal 0.6h are heated to, continue to be heated to 280 DEG C of isothermals
2.5h carries out tempering and stabilization of austenite processing.
Ultrahigh-intensity high-toughness non-carbide bainitic steel obtained is the compound bayesian of ultra-fine carbides-free continuously changed
Body tissue, wherein upper bainite accounting are 25%, lower bainite accounting 62%, and retained austenite accounting is 8~13%.It is this super
High-intensity and high-tenacity bainitic steel tensile strength 2400MPa, room temperature impact toughness 40J/cm2, hardness HRC60, with excellent
Wear-resisting property.
Claims (2)
1. a kind of ultrahigh-intensity high-toughness non-carbide bainitic steel, it is characterised in that：It is a kind of ultra-fine nothing continuously changed
The compound bainite structure of carbide, wherein upper bainite accounting are 20~25%, lower bainite accounting 60~65%, residual austenite
Body accounting is 10~15%, and chemical composition mass percent is：C：0.41~0.5, Si：2.0~2.2, Mn：1.8~2.2,
Cr：1.0~1.5, W：0.1~0.3, V：0.001~0.003, Al：0.1~0.3, Re：0.001~0.003, Ca：0.001~
0.003、B：0.0001~0.0003, N：0.002~0.005, Mg：0.001~0.005, remaining is Fe and a small amount of impurity element.
2. the preparation method of ultrahigh-intensity high-toughness non-carbide bainitic steel described in claim 1, it is characterised in that：
(1) it is 350~450 DEG C/min in 1400~1500 DEG C of temperature range cooling velocities by the continuous casting steel billet of mentioned component；
After 950~1000 DEG C of temperature ranges keep the temperature 4~6h, de-scaling processing is carried out to slab；
(2) by the Rolled From Continuous Casting Slab steel plate of step (1), breaking down temperature is 1150~1200 DEG C, and finishing temperature is 860~920
℃；It rolls rear air-cooled；It is heated to 600~650 DEG C of 4~6h of heat preservation and carries out stress relief annealing process；
(3) steel plate of step (2) is heated to 900~950 DEG C of austenitizings and keeps the temperature 1~3h, speed is cooled down with 80~100 DEG C/min
Degree be cooled to 400 DEG C, 2~5min of isothermal, Ms temperature 2~5min of isothermal are cooled to 5~10 DEG C/min cooling velocities, then with
10~20 DEG C/min is cooled to room temperature, after being heated to 100~120 DEG C of 0.5~1.0h of isothermal, continues to be heated to 260~290 DEG C
2~3h of isothermal carries out tempering and stabilization of austenite processing.
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| CN109628837B (en) * | 2019-01-02 | 2020-11-13 | 北京科技大学 | Superfine bainite type bridge cable steel and preparation method thereof |
| CN110527908A (en) * | 2019-09-06 | 2019-12-03 | 武汉科技大学 | A kind of middle carbon micro-nano structure bainitic steel and its heat treatment method |
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