CN110205557A - A kind of 350-380HBW hardness level thick-specification high-tenacity wear-resisting steel plate and preparation method - Google Patents
A kind of 350-380HBW hardness level thick-specification high-tenacity wear-resisting steel plate and preparation method Download PDFInfo
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- CN110205557A CN110205557A CN201910644684.1A CN201910644684A CN110205557A CN 110205557 A CN110205557 A CN 110205557A CN 201910644684 A CN201910644684 A CN 201910644684A CN 110205557 A CN110205557 A CN 110205557A
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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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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Abstract
The present invention relates to wear-resisting steel plate preparation technical fields, more particularly to a kind of 350-380HBW hardness level thick-specification high-tenacity wear-resisting steel plate and preparation method, the chemical component of steel plate is C:0.15%-0.19%, Si:0.20%-0.60%, Mn:1.10%-1.50%, Nb:0.01%-0.05%, Ni:0%-0.80%, Cr:0.30%-0.50%, Mo:0.30%-0.50%, V:0.015%-0.030%, P≤0.015%, S≤0.002%, Alt:0.050%-0.070%, remaining is Fe and trace impurity；Method is the following steps are included: smelting, continuous casting billet heating, formation rolling, steel plate slow cooling, out-line quenching, tempering heat treatment.This method is small to finished steel plate restrictive condition, and steel plate thickness specification is big, -40 DEG C of low-temperature impact toughness height.
Description
Technical field
The present invention relates to wear-resisting steel plate preparation technical fields, and in particular to a kind of 350-380HBW hardness level think gauge is high
Tough wear-resistant hard steel plate and preparation method.
Background technique
Wear-resisting steel plate is the pass of the equipment manufacturings such as coal mine machinery, engineering machinery, harbour machinery, mining equiment, self-dumping car
Key material.In recent years, equipment enlarging and heavy-duty feature are increasingly prominent, and Service Environment is increasingly harsh, to steel plate service performance
It is required that improving year by year.Usual impact flexibility is lower and unstable in production for existing low-alloy wear-resistant steel, so as to cause complexity
The problem of impact condition lower steel plate of multiplicity wears no resistance, and easy fracture fails.Therefore, for some big machinery abrasion-resistant stees
Plate, design department propose wear-resisting steel plate while guaranteeing hardness requirement, and the thickness and low-temperature flexibility to steel plate are made
Clear stipulaties are gone out.
Currently, the production of low-alloy wear-resistant steel, which generallys use continuous casting billet, heats → is rolled into target thickness and width → offline
The process flow of heating quenching heat treatment → tempering heat treatment, obtained microscopic structure are tempered martensite.This horse
Family name's body tissue can guarantee that steel plate has good hardness and wearability, but very unfavorable to low-temperature flexibility.When the thickness of steel plate
When degree increases to 60mm or more, the low-temperature flexibility of steel plate is even more to deteriorate rapidly, and impact flexibility is in 20J or less.It is this high rigidity, low
The low alloy wear resistance steel plate of toughness is difficult to adapt to the requirement of current complex working condition, and the equipment being produced from it is in operational process
In there are huge security risks.
Summary of the invention
For the above-mentioned deficiency of the prior art, it is resistance to that the present invention provides a kind of 350-380HBW hardness level thick-specification high-tenacity
Steel plate and preparation method are ground, this preparation method can be produced to a thickness of the continuous casting billet milling of 250-300mm with a thickness of 60-100mm
Wear-resisting steel plate, simple process, after rolling be not necessarily to on-line cooling；The steel plate thickness specification prepared by this method is big, and -40 DEG C low
Warm impact flexibility height, stable mechanical property, are very suitable for for manufacturing heavy mechanical equipment wear parts.
In a first aspect, the present invention provides a kind of 350-380HBW hardness level thick-specification high-tenacity wear-resisting steel plate, the steel
Plate includes the chemical component of following weight percent,
C:0.15%-0.19%, Si:0.20%-0.60%, Mn:1.10%-1.50%, Nb:0.01%-0.05%,
Ni:0%-0.80%, Cr:0.30%-0.50%, Mo:0.30%-0.50%, V:0.015%-0.030%, P≤0.015%,
S≤0.002%, Alt:0.050%-0.070%, remaining is Fe and trace impurity.
Further, the steel plate thickness is 60-100mm.
Further, the steel plate thickness is 60-80mm, and steel plate includes the chemical component of following weight percent,
C:0.17%-0.19%, Si:0.40%-0.60%, Mn:1.10%-1.30%, Nb:0.01%-0.03%,
Cr:0.30%-0.40%, Mo:0.30%-0.40%, V:0.015%-0.020%, P≤0.015%, S≤0.002%,
Alt:0.05%-0.06%, remaining is Fe and trace impurity.
Further, the steel plate thickness is 60-80mm, and Mn, Cr, Mo, Nb, V element are compound addition.
Further, the steel plate thickness is 80 < -100mm, and steel plate includes the chemical component of following weight percent,
C:0.15%- < 0.17%, Si:0.20%- < 0.40%, Mn:1.30% < -1.50%, Nb:0.03% < -
0.05%, Ni:0.60% < -0.80%, Cr:0.40% < -0.50%, Mo:0.40% < -0.50%, V:0.020% < -
0.030%, P≤0.015%, S≤0.002%, Alt:0.060% < -0.070%, remaining is Fe and trace impurity.
Wherein, 80 < -100mm indicates that the thickness of steel plate is greater than the case where 80mm is less than or equal to 100mm simultaneously.
Further, the steel plate thickness is 80 < -100mm, and Ni, Mn, Cr, Mo, Nb, V element are compound addition.
Further, the Brinell hardness of the surface of steel plate is 350-380, -40 DEG C of ballistic works at 1/4 steel plate thickness >=
60J。
Wherein, the effect of various elements is as follows in wear-resisting steel plate:
C:C is the main alloying element in steel, is affected to armor plate strength, hardness, toughness and its harden ability, higher
C content will increase the intensity, hardness and harden ability of steel, but deterioration effect can be generated to toughness.Therefore, in the present invention, C content
Control is in 0.15%-0.19%.
Si:Si is dissolved in ferrite and austenite in steel, can significantly improve the intensity and hardness of steel.However, Si is too high
When, it is easy to produce temper brittleness, reduces the toughness of steel.Therefore, Si content of the present invention should control the range in 0.20%-0.60%
It is interior.
Mn:Mn can increase toughness, intensity, hardness and the harden ability for improving steel of steel, improve the hot-working character of steel.
Mn content of the invention controls within the scope of 1.10%-1.50%.
P, S:P and S is the harmful element in steel, can influence the brittleness of steel.S can form plastic occluded foreignsubstance with manganese in steel
MnS, horizontal plastic property and toughness to steel plate have larger impact；P also seriously affects the plasticity and toughness of steel plate simultaneously.For this
For invention, the lower the content of P and S the better, but in the actual production process, P and S are inevitable, therefore, in the present invention
P content control below 0.015%, S content control below 0.002%.
Steel belt roof bolt stability, harden ability can be improved in Mo:Mo, prevents temper brittleness, in order to further increase the strong of steel
Degree and wearability, Mo content control of the present invention is in 0.30%-0.50%.
Cr, Ni:Ni element are the main alloying elements for improving the low-temperature flexibility of steel.It, can when Cr, Ni elements compounding are added
To increase exponentially the harden ability of steel, it is ensured that martensitic structure is obtained inside thick steel plates, to guarantee that it is sufficiently high that steel plate has
Hardness.Ni content is controlled in the present invention and is controlled in 0.50%-0.80%, Cr content in 0.30%-0.50%
Al:Al is most strong one of deoxidier, can effectively remove the O in steel.In addition, to be also important crystal grain thin by Al
Change element, there is positive effect to steel plate impact flexibility is improved.In view of the thickness specification the present invention relates to steel plate is larger and tough
Property it is more demanding, by Al content control in the range of 0.050%~0.070%.
Second aspect, the present invention provide a kind of preparation side of 350-380HBW hardness level thick-specification high-tenacity wear-resisting steel plate
Method, method the following steps are included:
Step (a) is smelted: molten iron passes through KR pretreatment, top and bottom combined blown converter smelting, LF ladle furnace refining, RH vacuum outgas
Continuous casting billet is made in refining and slab caster；
The heating of step (b) continuous casting billet: continuous casting billet uses band temperature shove charge to heat, and the temperature of continuous casting billet is 100- before shove charge
300 DEG C, continuous blank heating temperature is controlled at 1200-1220 DEG C；
Step (c) formation rolling: the rolling of austenite recrystallization area and austenite non-recrystallization are carried out to the continuous casting billet of heating
Area's rolling, extreme trace time finishing temperature >=1050 DEG C in austenite recrystallization area, austenite Unhydrated cement start rolling temperature is 965-
990 DEG C, ratio >=3 between thickness of strand and finished steel plate thickness；
Step (d) steel plate slow cooling: stacking slow cooling is quickly carried out after steel plate rolling forming, starts slow cooling temperature >=500 DEG C, is delayed
Cool time >=36 hour；
Step (e) out-line quenching: the steel plate after slow cooling is heated to 900-920 DEG C of complete austenitizing offline, quenching is protected
The warm time is 20-25min, carries out being quenched to room temperature by quenching press；
Step (f) tempering heat treatment: 280-400 DEG C of tempering heat treatment, tempering insulation time 30-40min are carried out.
Further, when steel plate thickness is 60-80mm, the preparation method of steel plate the following steps are included:
Step (a) is smelted: molten iron passes through KR pretreatment, top and bottom combined blown converter smelting, LF ladle furnace refining, RH vacuum outgas
Refining and slab caster continuous casting billet；
The heating of step (b) continuous casting billet: continuous casting billet uses band temperature shove charge to heat, and the temperature of continuous casting billet is 100- before shove charge
300 DEG C, continuous blank heating temperature is controlled at 1200-1220 DEG C；
Step (c) formation rolling: the rolling of austenite recrystallization area and austenite non-recrystallization are carried out to the continuous casting billet of heating
Area's rolling, extreme trace time finishing temperature >=1050 DEG C in austenite recrystallization area, austenite Unhydrated cement start rolling temperature is 975-
990 DEG C, ratio >=3 between thickness of strand and finished steel plate thickness；
Step (d) steel plate slow cooling: steel plate stacking slow cooling start temperature >=500 DEG C, slow cooling time >=36 hour after rolling；
Step (e) out-line quenching: the steel plate after slow cooling is heated to 900-910 DEG C of complete austenitizing offline, keeps the temperature 20-
Water quenching is to room temperature after 25min；
Step (f) tempering heat treatment: 320-400 DEG C of tempering heat treatment, tempering insulation time 30-40min are carried out.
Further, when steel plate thickness is 80 < -100mm, the preparation method of steel plate the following steps are included:
Step (a) is smelted: molten iron passes through KR pretreatment, top and bottom combined blown converter smelting, LF ladle furnace refining, RH vacuum outgas
Continuous casting billet is made in refining and slab caster；
The heating of step (b) continuous casting billet: continuous casting billet uses band temperature shove charge to heat, and the temperature of continuous casting billet is 100- before shove charge
300 DEG C, continuous blank heating temperature is controlled at 1200-1220 DEG C；
Step (c) formation rolling: the rolling of austenite recrystallization area and austenite non-recrystallization are carried out to the continuous casting billet of heating
Area's rolling, the extreme trace in austenite recrystallization area time finishing temperature>=1050 DEG C, austenite Unhydrated cement start rolling temperature be 965-<
975 DEG C, ratio >=3 between thickness of strand and finished steel plate thickness；
Step (d) steel plate slow cooling: steel plate stacking slow cooling start temperature >=550 DEG C, slow cooling time >=48 hour after rolling；
Step (e) out-line quenching: being heated to 910 < -920 DEG C of complete austenitizings for the steel plate after slow cooling offline, heat preservation
Water quenching is to room temperature after 20-25min；
Step (f) tempering heat treatment: 280- < 320 DEG C tempering heat treatment, tempering insulation time 30-40min are carried out.
The beneficial effects of the present invention are,
The present invention provides a kind of 350-380HBW hardness level thick-specification high-tenacity wear-resisting steel plate and preparation method,
This preparation method can be processed to a thickness of the continuous casting billet of 250-300mm, and to the restrictive condition of finished steel plate
It is small, 60-100mm think gauge low-temperature-resistance high-toughness abrasion-resistant stee can be produced；Steel plate does not need to accelerate cooling online after roll forming
And timely high-temperature long-time stacking slow cooling after rolling, the structural stress and thermal stress inside steel plate are reduced, is reduced
The risk of cracking of think gauge abrasion-resistant stee during gas flame cuttiug.
The mechanical property of steel plate of 60-100mm thickness as made from this preparation method is excellent, -40 DEG C of low temperature at 1/4 thickness
Impact flexibility is 350-380HBW in 60J or more, surface of steel plate hardness, and thickness direction uniformity of hardness is preferable, hard inside steel plate
Degree is not less than the 80% of surface hardness, is very suitable for for manufacturing heavy mechanical equipment wear parts.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention below will be implemented the present invention
Technical solution in example is clearly and completely described, it is clear that described embodiment is only that present invention a part is implemented
Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creativeness
Every other embodiment obtained, should fall within the scope of the present invention under the premise of labour.
The low-temperature-resistance high-toughness wear-resisting steel plate of embodiment 1 60mm thickness
The chemical component weight percentage content of wear-resisting steel plate is C:0.18%, Si:0.45%, Mn:1.22%, Nb:
0.024%, Cr:0.33%, Mo:0.35%, V:0.018%, P:0.012%, S:0.001%, Alt:0.055%, remaining is
Fe and trace impurity, wherein Mn, Cr, Mo, Nb, V element be compound addition, wear-resisting iron plate with a thickness of 60mm；
Wear-resisting steel plate the preparation method is as follows:
Step (a) is smelted: molten iron passes through KR pretreatment, top and bottom combined blown converter smelting, LF ladle furnace refining, RH vacuum outgas
The continuous casting billet that cross dimensions is 250mm (thickness) × 2200mm (width) is made in refining and slab caster；
The heating of step (b) continuous casting billet: continuous casting billet uses band temperature shove charge to heat, and the temperature of continuous casting billet is 180 DEG C before shove charge,
Continuous blank heating temperature is 1205 DEG C；
Step (c) formation rolling: being rolled into steel plate using 4300mm Stand Mill, carries out austenite again to the continuous casting billet of heating
The extreme trace time finishing temperature of crystal region rolling and the rolling of austenite Unhydrated cement, austenite recrystallization area is 1100 DEG C, Ovshinsky
Body Unhydrated cement start rolling temperature is 988 DEG C, and the open rolling of austenite Unhydrated cement is with a thickness of 180mm, thickness of strand and finished product
Ratio=4.17 between steel plate thickness；
Step (d) steel plate slow cooling: steel plate stacking slow cooling start temperature is 506 DEG C after rolling, and slow cooling time is 36 hours；
Step (e) out-line quenching: the steel plate after slow cooling is heated to be 910 DEG C offline, soaking time 20min, water quenching is extremely
Room temperature；
Step (f) tempering heat treatment: 387 DEG C of tempering heat treatments, tempering insulation time 40min are carried out.
It is 375HBW by the 60mm thickness wear-resisting steel plate surface Brinell hardness that above-mentioned technique obtains, steel plate inner hardness is
311-322HBW, -40 DEG C of low-temperature impact works at 1/4 steel plate thickness are 70J.
2 70mm thickness low-temperature-resistance high-toughness wear-resisting steel plate of embodiment
The chemical component weight percentage content of wear-resisting steel plate is C:0.18%, Si:0.45%, Mn:1.27%, Nb:
0.024%, Cr:0.31%, Mo:0.32%, V:0.017%, P:0.010%, S:0.002%, Alt:0.057%, remaining is
Fe and trace impurity, wherein Mn, Cr, Mo, Nb, V element be compound addition, wear-resisting iron plate with a thickness of 70mm；
Wear-resisting steel plate the preparation method is as follows:
Step (a) is smelted: molten iron passes through KR pretreatment, top and bottom combined blown converter smelting, LF ladle furnace refining, RH vacuum outgas
The continuous casting billet that cross dimensions is 250mm (thickness) × 2200mm (width) is made in refining and slab caster；
The heating of step (b) continuous casting billet: continuous casting billet uses band temperature shove charge to heat, and the temperature of continuous casting billet is 192 DEG C before shove charge,
Continuous blank heating temperature is 1210 DEG C；
Step (c) formation rolling: being rolled into steel plate using 4300mm Stand Mill, carries out austenite again to the continuous casting billet of heating
The extreme trace time finishing temperature of crystal region rolling and the rolling of austenite Unhydrated cement, austenite recrystallization area is 1150 DEG C, Ovshinsky
Body Unhydrated cement start rolling temperature is 980 DEG C, and the open rolling of austenite Unhydrated cement is with a thickness of 161mm, thickness of strand and finished product
Ratio=3.57 between steel plate thickness；
Step (d) steel plate slow cooling: steel plate stacking slow cooling start temperature is 525 DEG C after rolling, and slow cooling time is 42.5 hours；
Step (e) out-line quenching: the steel plate after slow cooling is heated to be 905 DEG C offline, soaking time 24min, water quenching is extremely
Room temperature；
Step (f) tempering heat treatment: 366 DEG C of tempering heat treatments, tempering insulation time 36min are carried out.
It is 369HBW by the 70mm thickness wear-resisting steel plate surface Brinell hardness that above-mentioned technique obtains, steel plate inner hardness is
310-320HBW, -40 DEG C of low-temperature impact works at 1/4 steel plate thickness are 63J.
3 80mm thickness low-temperature-resistance high-toughness wear-resisting steel plate of embodiment
The chemical component weight percentage content of wear-resisting steel plate is C:0.18%, Si:0.42%, Mn:1.25%, Nb:
0.021%, Cr:0.34%, Mo:0.36%, V:0.015%, P:0.009%, S:0.001%, Alt:0.052%, remaining is
Fe and trace impurity, wherein Mn, Cr, Mo, Nb, V element be compound addition, wear-resisting iron plate with a thickness of 80mm；
Wear-resisting steel plate the preparation method is as follows:
Step (a) is smelted: molten iron passes through KR pretreatment, top and bottom combined blown converter smelting, LF ladle furnace refining, RH vacuum outgas
The continuous casting billet that cross dimensions is 300mm (thickness) × 2200mm (width) is made in refining and slab caster；
The heating of step (b) continuous casting billet: continuous casting billet uses band temperature shove charge to heat, and the temperature of continuous casting billet is 167 DEG C before shove charge,
Continuous blank heating temperature is 1209 DEG C；
Step (c) formation rolling: being rolled into steel plate using 4300mm Stand Mill, carries out austenite again to the continuous casting billet of heating
The extreme trace time finishing temperature of crystal region rolling and the rolling of austenite Unhydrated cement, austenite recrystallization area is 1070 DEG C, Ovshinsky
Body Unhydrated cement start rolling temperature is 978 DEG C, and the open rolling of austenite Unhydrated cement is with a thickness of 168mm, thickness of strand and finished product
Ratio=3.75 between steel plate thickness；
Step (d) steel plate slow cooling: steel plate stacking slow cooling start temperature is 551 DEG C after rolling, and slow cooling time is 48 hours；
Step (e) out-line quenching: the steel plate after slow cooling is heated to be 910 DEG C offline, soaking time 25min, water quenching is extremely
Room temperature；
Step (f) tempering heat treatment: 333 DEG C of tempering heat treatments, tempering insulation time 38min are carried out.
It is 377HBW by the 80mm thickness wear-resisting steel plate surface Brinell hardness that above-mentioned technique obtains, steel plate inner hardness is
315-330HBW, -40 DEG C of low-temperature impact works at 1/4 steel plate thickness are 69J.
4 90mm thickness low-temperature-resistance high-toughness wear-resisting steel plate of embodiment
The chemical component weight percentage content of wear-resisting steel plate are as follows: C:0.16%, Si:0.32%, Mn:1.35%, Nb:
0.033%, Ni:0.63%, Cr:0.44%, Mo:0.46%, V:0.025%, P:0.007%, S:0.001%, Alt:
0.065%, remaining is Fe and trace impurity, and wherein Ni, Mn, Cr, Mo, Nb, V element are compound addition, the thickness of wear-resisting iron plate
For 90mm；
Wear-resisting steel plate the preparation method is as follows:
Step (a) is smelted: molten iron passes through KR pretreatment, top and bottom combined blown converter smelting, LF ladle furnace refining, RH vacuum outgas
The continuous casting billet that cross dimensions is 300mm (thickness) × 2200mm (width) is made in refining and slab caster；
The heating of step (b) continuous casting billet: continuous casting billet uses band temperature shove charge to heat, and the temperature of continuous casting billet is 280 DEG C before shove charge,
Continuous blank heating temperature is 1215 DEG C；
Step (c) formation rolling: being rolled into steel plate using 4300mm Stand Mill, carries out austenite again to the continuous casting billet of heating
The extreme trace time finishing temperature of crystal region rolling and the rolling of austenite Unhydrated cement, austenite recrystallization area is 1075 DEG C, Ovshinsky
Body Unhydrated cement start rolling temperature is 972 DEG C, and the open rolling of austenite Unhydrated cement is with a thickness of 168mm, thickness of strand and finished product
Ratio=3.33 between steel plate thickness；
Step (d) steel plate slow cooling: steel plate stacking slow cooling start temperature is 555 DEG C after rolling, and slow cooling time is 48 hours；
Step (e) out-line quenching: the steel plate after slow cooling is heated to be 913 DEG C offline, soaking time 25min, water quenching is extremely
Room temperature；
Step (f) tempering heat treatment: 299 DEG C of tempering heat treatments, tempering insulation time 38min are carried out.
It is 360HBW by the 90mm thickness wear-resisting steel plate surface Brinell hardness that above-mentioned technique obtains, steel plate inner hardness is
311-321HBW, -40 DEG C of low-temperature impact works at 1/4 steel plate thickness are 65J.
5 100mm thickness low-temperature-resistance high-toughness wear-resisting steel plate of embodiment
The chemical component weight percentage content of wear-resisting steel plate are as follows: C:0.15%, Si:0.31%, Mn:1.45%, Nb:
0.037%, Ni:0.75%, Cr:0.48%, Mo:0.43%, V:0.026%, P:0.007%, S:0.002%, Alt:
0.06%, remaining be Fe and trace impurity, wherein Ni, Mn, Cr, Mo, Nb, V element be compound addition, wear-resisting iron plate with a thickness of
100mm；
Wear-resisting steel plate the preparation method is as follows:
Step (a) is smelted: molten iron passes through KR pretreatment, top and bottom combined blown converter smelting, LF ladle furnace refining, RH vacuum outgas
The continuous casting billet that cross dimensions is 300mm (thickness) × 2200mm (width) is made in refining and slab caster；
The heating of step (b) continuous casting billet: continuous casting billet uses band temperature shove charge to heat, and the temperature of continuous casting billet is 275 DEG C before shove charge,
Continuous blank heating temperature is 1216 DEG C；
Step (c) formation rolling: being rolled into steel plate using 4300mm Stand Mill, carries out austenite again to the continuous casting billet of heating
The extreme trace time finishing temperature of crystal region rolling and the rolling of austenite Unhydrated cement, austenite recrystallization area is 1113 DEG C, Ovshinsky
Body Unhydrated cement start rolling temperature is 966 DEG C, and the open rolling of austenite Unhydrated cement is with a thickness of 150mm, thickness of strand and finished product
Ratio=3 between steel plate thickness；
Step (d) steel plate slow cooling: steel plate stacking slow cooling start temperature is 565 DEG C after rolling, and slow cooling time is 60 hours；
Step (e) out-line quenching: the steel plate after slow cooling is heated to be 920 DEG C offline, soaking time 23min, water quenching is extremely
Room temperature；
Step (f) tempering heat treatment: 310 DEG C of tempering heat treatments, tempering insulation time 40min are carried out.
It is 355HBW, steel plate inner hardness by the 100mm thickness wear-resisting steel plate surface Brinell hardness that above-mentioned technique obtains
For 305-314HBW, -40 DEG C of low-temperature impact works at 1/4 steel plate thickness are 73J.
Although the present invention is not limited thereto to the present invention have been described in detail by way of preferred embodiment.?
Under the premise of not departing from spirit and substance of the present invention, those of ordinary skill in the art can carry out the embodiment of the present invention each
Kind equivalent modifications or substitutions, and these modifications or substitutions all should in covering scope of the invention/any be familiar with this technology neck
The technical staff in domain in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all cover of the invention
Within protection scope.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. a kind of 350-380HBW hardness level thick-specification high-tenacity wear-resisting steel plate, which is characterized in that the steel plate chemistry at
Dividing weight percent content is C:0.15%-0.19%, Si:0.20%-0.60%, Mn:1.10%-1.50%, Nb:
0.01%-0.05%, Ni:0%-0.80%, Cr:0.30%-0.50%, Mo:0.30%-0.50%, V:0.015%-
0.030%, P≤0.015%, S≤0.002%, Alt:0.050%-0.070%, remaining is Fe and trace impurity.
2. a kind of 350-380HBW hardness level thick-specification high-tenacity wear-resisting steel plate as described in claim 1, which is characterized in that
The steel plate thickness is 60-100mm.
3. a kind of 350-380HBW hardness level thick-specification high-tenacity wear-resisting steel plate as claimed in claim 2, which is characterized in that
The steel plate thickness is 60-80mm, and steel plate includes the chemical component of following weight percent,
C:0.17%-0.19%, Si:0.40%-0.60%, Mn:1.10%-1.30%, Nb:0.01%-0.03%, Cr:
0.30%-0.40%, Mo:0.30%-0.40%, V:0.015%-0.020%, P≤0.015%, S≤0.002%, Alt:
0.05%-0.06%, remaining is Fe and trace impurity.
4. a kind of 350-380HBW hardness level thick-specification high-tenacity wear-resisting steel plate as claimed in claim 3, which is characterized in that
The Mn, Cr, Mo, Nb, V element are compound addition.
5. a kind of 350-380HBW hardness level thick-specification high-tenacity wear-resisting steel plate as claimed in claim 2, which is characterized in that
The steel plate thickness is 80 < -100mm, and steel plate includes the chemical component of following weight percent,
C:0.15%- < 0.17%, Si:0.20%- < 0.40%, Mn:1.30% < -1.50%, Nb:0.03% < -0.05%,
Ni:0.60% < -0.80%, Cr:0.40% < -0.50%, Mo:0.40% < -0.50%, V:0.020% < -0.030%, P≤
0.015%, S≤0.002%, Alt:0.060% < -0.070%, remaining is Fe and trace impurity.
6. a kind of 350-380HBW hardness level thick-specification high-tenacity wear-resisting steel plate as claimed in claim 5, which is characterized in that
The Ni, Mn, Cr, Mo, Nb, V element are compound addition.
7. a kind of 350-380HBW hardness level thick-specification high-tenacity wear-resisting steel plate as described in claim 1, which is characterized in that
The Brinell hardness of the surface of steel plate is 350-380, -40 DEG C of ballistic work >=60J at 1/4 steel plate thickness.
8. a kind of system of such as described in any item 350-380HBW hardness level thick-specification high-tenacity wear-resisting steel plates of claim 1-7
Preparation Method, which is characterized in that method the following steps are included:
Step (a) is smelted: molten iron passes through KR pretreatment, top and bottom combined blown converter smelting, LF ladle furnace refining, RH vacuum deaeration refining
And continuous casting billet is made in slab caster；
The heating of step (b) continuous casting billet: continuous casting billet uses band temperature shove charge to heat, and the temperature of continuous casting billet is 100-300 DEG C before shove charge,
Continuous blank heating temperature is controlled at 1200-1220 DEG C；
Step (c) formation rolling: the rolling of austenite recrystallization area is carried out to the continuous casting billet of heating and austenite Unhydrated cement rolls
System, extreme trace time finishing temperature >=1050 DEG C in austenite recrystallization area, austenite Unhydrated cement start rolling temperature is 965-990
DEG C, ratio >=3 between thickness of strand and finished steel plate thickness；
Step (d) steel plate slow cooling: quickly carrying out stacking slow cooling after steel plate rolling forming, starts slow cooling temperature >=500 DEG C, when slow cooling
Between >=36 hours；
Step (e) out-line quenching: being heated to 900-920 DEG C of complete austenitizing for the steel plate after slow cooling offline, when quenching and preserving heat
Between be 20-25min, carry out being quenched to room temperature by quenching press；
Step (f) tempering heat treatment: 280-400 DEG C of tempering heat treatment, tempering insulation time 30-40min are carried out.
9. a kind of preparation method of 350-380HBW hardness level thick-specification high-tenacity wear-resisting steel plate as claimed in claim 8,
It is characterized in that, when steel plate thickness is 60-80mm, the preparation method of steel plate the following steps are included:
Step (a) is smelted: molten iron passes through KR pretreatment, top and bottom combined blown converter smelting, LF ladle furnace refining, RH vacuum deaeration refining
And slab caster continuous casting billet；
The heating of step (b) continuous casting billet: continuous casting billet uses band temperature shove charge to heat, and the temperature of continuous casting billet is 100-300 DEG C before shove charge,
Continuous blank heating temperature is controlled at 1200-1220 DEG C；
Step (c) formation rolling: the rolling of austenite recrystallization area is carried out to the continuous casting billet of heating and austenite Unhydrated cement rolls
System, extreme trace time finishing temperature >=1050 DEG C in austenite recrystallization area, austenite Unhydrated cement start rolling temperature is 975-990
DEG C, ratio >=3 between thickness of strand and finished steel plate thickness；
Step (d) steel plate slow cooling: steel plate stacking slow cooling start temperature >=500 DEG C, slow cooling time >=36 hour after rolling；
Step (e) out-line quenching: the steel plate after slow cooling is heated to 900-910 DEG C of complete austenitizing offline, keeps the temperature 20-
Water quenching is to room temperature after 25min；
Step (f) tempering heat treatment: 320-400 DEG C of tempering heat treatment, tempering insulation time 30-40min are carried out.
10. a kind of preparation method of 350-380HBW hardness level thick-specification high-tenacity wear-resisting steel plate as claimed in claim 8,
It is characterized in that, when steel plate thickness is 80 < -100mm, the preparation method of steel plate the following steps are included:
Step (a) is smelted: molten iron passes through KR pretreatment, top and bottom combined blown converter smelting, LF ladle furnace refining, RH vacuum deaeration refining
And continuous casting billet is made in slab caster；
The heating of step (b) continuous casting billet: continuous casting billet uses band temperature shove charge to heat, and the temperature of continuous casting billet is 100-300 DEG C before shove charge,
Continuous blank heating temperature is controlled at 1200-1220 DEG C；
Step (c) formation rolling: the rolling of austenite recrystallization area is carried out to the continuous casting billet of heating and austenite Unhydrated cement rolls
System, extreme trace time finishing temperature>=1050 DEG C in austenite recrystallization area, austenite Unhydrated cement start rolling temperature is 965-<975
DEG C, ratio >=3 between thickness of strand and finished steel plate thickness；
Step (d) steel plate slow cooling: steel plate stacking slow cooling start temperature >=550 DEG C, slow cooling time >=48 hour after rolling；
Step (e) out-line quenching: the steel plate after slow cooling is heated to 910 < -920 DEG C of complete austenitizings offline, keeps the temperature 20-
Water quenching is to room temperature after 25min；
Step (f) tempering heat treatment: 280- < 320 DEG C tempering heat treatment, tempering insulation time 30-40min are carried out.
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