CN107099729B - The method of the ultrafast cold technique production thin gauge abrasion-resistant stee NM450 of hot continuous rolling - Google Patents

The method of the ultrafast cold technique production thin gauge abrasion-resistant stee NM450 of hot continuous rolling Download PDF

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CN107099729B
CN107099729B CN201710204563.6A CN201710204563A CN107099729B CN 107099729 B CN107099729 B CN 107099729B CN 201710204563 A CN201710204563 A CN 201710204563A CN 107099729 B CN107099729 B CN 107099729B
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steel
temperature
furnace
slag
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CN107099729A (en
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周峰
李烈军
高吉祥
彭政务
孙海波
戴杰涛
鲁艳军
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South China University of Technology SCUT
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • 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
    • 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
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • C—CHEMISTRY; METALLURGY
    • 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
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese

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  • Physics & Mathematics (AREA)
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  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention discloses the method for the ultrafast cold technique production thin gauge abrasion-resistant stee NM450 of hot continuous rolling a kind of, comprising steps of blast-melted, KR take off S, converter smelting, the refining of RH furnace, the refining of LF furnace, conventional plate blank continuous casting, be cooled to room temperature, slab inspection, casting billet surface strip off the skin, heating furnace, high pressure water dephosphorization, roughing, high pressure water dephosphorization, finish rolling, ultra-rapid cooling, batch, open flat, heating, quenching, tempering, finishing, inspection.The present invention selects micro Cu, Mo, Cr, Nb, Ti, B alloy to carry out microalloying by reasonable Alloying Design, passes through ultra-rapid cooling quenching control microstructure after controlled rolling, give full play to the hydrodynamics effect of alloy, the additional amount of alloy and the usage amount of precious alloy are reduced, and simplifies technique, compared with traditional handicraft, reduce energy consumption, process flow is shortened, alloy addition is reduced, improves the tough proportion of steel, social resources are saved, production cost is reduced.

Description

The method of the ultrafast cold technique production thin gauge abrasion-resistant stee NM450 of hot continuous rolling
Technical field
The invention belongs to the ultrafast cold techniques of wear-resisting steel plate manufacturing technology field more particularly to a kind of hot continuous rolling to produce thin gauge The manufacturing method of abrasion-resistant stee NM450.
Background technique
Abrasion-resistant stee is resistant to the steel of abrasive wear, is widely used in each industrial or agricultural such as metallurgy, mine, building materials and military affairs Antiwear place is needed in production.Wherein wear-resisting steel plate is most widely used, the use of industry is construction machinery production industry, finally Purposes is the industries such as metallurgy, coal, cement, electric power, glass, mine, building materials, ceramics, brick and tile, agricultural.
The traditional processing technology process of wear-resisting steel plate are as follows: electric furnace (converter) smelting → refining → continuous casting → heating → roughing → Intermediate base → finish rolling → heat treatment → inspection storage, country's main manufacturer has Wugang, Wuhan Iron and Steel Plant, Baosteel, Nangang at present, uses Heavy and medium plate mill or continuous hot-rolling mill are produced compared with think gauge product, and thin gauge production is difficult, and high production cost, plate shape is difficult to protect Card, the production cycle is long, and delivery date is difficult to ensure, since the yield of domestic thin gauge wear-resisting steel plate is seldom, it is difficult to meet domestic city The needs of field, in addition advantage and part project with foreign funds machine-building unit of the external product in quality are to wear-resisting steel material Be distinctly claimed, lead to external the wear-resisting steel plate more occupancy volume in market and the higher market price at home.City, the country at present The wear-resisting steel plate of field thin gauge is mainly the product of Sweden HARDAX, Japan JFE, Germany XAR and Luo Qi steel mill, Finland, and the country opens It issues superior in quality thin gauge wearing plate and effect is obviously promoted to the raising performance of enterprises and the domestic steel industry structure of adjustment.
Summary of the invention
It is an object of the present invention to provide the methods of the ultrafast cold technique production thin gauge abrasion-resistant stee NM450 of hot continuous rolling a kind of, use Traditional hot continuous rolling production line combines ultrafast cold technique to obtain more excellent finer and closely woven microstructure, and have high wear-resisting property, Welding performance and corrosion resistance, and can manufacture the good thin gauge abrasion-resistant stee of plate shape, production cost is reduced, is shortened Delivery cycle.
To achieve the above object, the technical solution adopted by the present invention is that:
A kind of method of the ultrafast cold technique production thin gauge abrasion-resistant stee NM450 of hot continuous rolling, comprising steps of
It (1) is > 1250 DEG C by temperature, the molten iron of [S]≤0.020% carries out KR and takes off S, then carries out dry slag and sufficiently skims Processing, molten iron drossing to molten iron light area >=93% reduce and return S in converter, molten iron terminal [S]≤0.0020%,；
(2) converter smelting is carried out, makees coolant with pellet, pellet and iron scale must be added as required；Fluorite Should be added on a small quantity in batches according to slag situation in furnace, steel additional amount≤3.5kg per ton, whens double slags steel≤5.0kg per ton, blowing end point Preceding 2min forbids that fluorite is added, and carries out double slag-stopping tappings, slag thickness≤42mm, converter tapping ferrosilicon using slag retaining cone, floating plug Or silicomangan carries out component controlling, and must not carry out deoxidation and alloying using material containing Al；
(3) RH furnace refines, and to after RH, measures and record [O] content in steel, Steel ladle clearance control with quick Determining oxygen probe In 400~600mm, molten steel and top slag thickness should be less than 100mm, and liquid steel temperature is 1595 DEG C -1630 DEG C, first carries out RH and gently handles: Vacuum degree≤500Pa is handled time 15-20 minutes, is sequentially added corresponding alloy and is carried out alloying, opens Pyatyi vacuum pump, Carry out vacuum cycle processing；
(4) it has handled and has entered back into the refining of LF furnace, aluminum steel and titanium wire or Ti alloy, adjustment are successively fed before LF refining is outbound AlSWith the ingredient of Ti, the microalloying of B is finally carried out；
(5) conventional plate blank continuous casting is carried out, continuous casting is sealed using long nozzle protective casting and Ar, is wrapped in the middle carbon-free alkalinity of cladding lid Slag, using dedicated middle carbon abrasion resistant steel crystallizer protecting residue, at 15~25 DEG C, continuous casting process puts into crystallizer electromagnetism for degree of superheat control Stirring uses dynamic Continuous Casting Soft Reduction technique in fan-shaped section, and pulling speed of continuous casting is controlled in 1.0~1.2m/min, thickness of strand 220mm；
(6) slab is cooled to room temperature, slab quality and surface is checked, take one layer of continuous casting billet surface epidermis off；
(7) it is sent into stove heating, in heating furnace heating time >=240min, 1180~1260 DEG C of heating temperature, slab goes out Furnace temp >=1150 DEG C are rolled using two-stage control, and recrystallization zone is rolled, reduces and rolls under equipment enabled condition Passage processed improves rolling pass reduction rate；And the residence time after bundle is appropriately extended, to increase the recrystallization number of deformed austenite Amount, makes microstructure homogenization；
(8) go out the laggard horizontal high voltage water dephosphorization of heating furnace, dephosphorization pressure >=16MPa；
(9) 5 ~ 9 passage roughing are carried out after dephosphorization；
(10) roughing it is complete to steel temperature drop to 900~950 DEG C or so, carry out the rolling of austenite non-recrystallization zone, guarantee it is non-again The total reduction of crystal region is greater than 45%, suitably increases 3 percentage pass reductions before reduction in pass, especially finish rolling by rolling power It is more as big as possible, it creates favorable conditions for subsequent austenite to ferritic phase deformed nucleus, increases nucleation sites, to reach thin Change the purpose of ferrite crystal grain, finishing temperature is controlled as far as possible close to Ar3 phase transition temperature, final pass reduction ratio≤12%, with Guarantee that thickness is accurate and plate shape is good, milling train 6 ~ 12mm of exit thickness, 860~920 DEG C of exit temperature at finishing；
(11) rolled piece goes out after milling train using ultra-fast cooling device cooling, and cooling rate is 15 ~ 30 DEG C/s, and quenching final temperature is 550~650℃；
(12) coiling machine batches, and it is cooling to carry out stacking；
(13) it send crosscutting heat treatment department to carry out out flat, opens usually steel roll temperature≤60 DEG C, open and steel plate is thrown after putting down Ball processing removal scale on surface；
(14) steel plate upper and lower surface pellet, heat-treatment furnace heating temperature 900~950 are cleaned out before entering heat-treatment furnace DEG C, 1.5~2h is kept the temperature, is quenched；
(15) tempering is carried out when temperature is down to 300~400 DEG C；
(16) finishing, inspection are carried out in Precise asymptotics.
Further, the chemical component and its content of the slab obtained after conventional plate blank continuous casting are carried out in step (5) are as follows: C For 0.20~0.30wt%, Si is 0.2~0.4wt%, and Mn is 1.5~2.0wt%, and Cu is 0.3~0.50wt%, Mo is 0.35~ 0.55wt%, Cr be 0.75~1.20wt%, Nb be 0.03~0.06wt%, Ti be 0.02~0.05wt%, B be 0.0006~ 0.0015wt%, P < 0.015wt%, S < 0.010wt%, remaining is Fe and impurity.
Further, in step (2), before the new blow-on of converter 8 furnaces and it is big mend after preceding 3 furnace must not smelt identical steel grade.
Further, in step (13), shot blasting velocity≤2 ~ 4m/min, steel plate roughness is 25-55 μm after ball blast.
Further, in step (10), 6 ~ 12mm of the milling train exit thickness, 860~920 DEG C of exit temperature at finishing.
Molten iron and steel scrap are carried out continuous casting, hot rolling after pneumatic steelmaking and the refining of RH+LF furnace by the present invention, and press quenching is protected The heat preservation of temperature hole.Specifically include: blast-melted → KR takes off S → converter smelting → RH furnace refining → LF furnace refining → conventional plate blank and connects Room temperature → slab inspection → casting billet surface is cast → is cooled to strip off the skin → heating furnace → high pressure water dephosphorization → roughing → high pressure water dephosphorization → finish rolling → ultra-rapid cooling → is batched → is opened flat → heating → quenching → tempering → finishing → inspection → mark → and determines → enter Library.
The present invention selects micro Cu, Mo, Cr, Nb, Ti, B alloy to carry out microalloy by reasonable Alloying Design Change, by ultra-rapid cooling quenching control microstructure after controlled rolling, gives full play to the hydrodynamics effect of alloy, reduce and close The additional amount of gold and the usage amount of precious alloy, and out-line quenching+tempering process is carried out after simplifying traditional abrasion-resistant stee hot rolling, Using the method compared with traditional handicraft, energy consumption is reduced, shortens process flow, reduces alloy addition, is improved The tough proportion of steel saves social resources, reduces production cost.
Specific embodiment
The invention will be further described With reference to embodiment, and it is not intended to limit the protection scope of the present invention.
Embodiment 1
A kind of method of the ultrafast cold technique production thin gauge abrasion-resistant stee NM450 of hot continuous rolling, comprising steps of
(1) molten iron that be 1300 DEG C by temperature, [S] is 0.010% (mass percent of S in molten iron) carries out KR and takes off S, so It sufficiently skims afterwards, molten iron drossing to molten iron light area 95% reduces and returns S in converter, and molten iron terminal [S] is 0.0010% (molten iron The mass percent of middle S)；
(2) carry out converter smelting, before the new blow-on of converter 8 furnaces and it is big mend after preceding 3 furnace must not smelt this steel grade, made with pellet Coolant, pellet and iron scale must be added as required；Fluorite should be added on a small quantity in batches according to slag situation in furnace, steel per ton Additional amount 3.0kg, whens double slags steel≤4.8kg per ton, 2min forbids that fluorite is added before blowing end point, using slag retaining cone, floating plug Double slag-stopping tappings, slag thickness 38mm are carried out, converter tapping ferrosilicon or silicomangan carry out component controlling, must not use and contain Al material carries out deoxidation and alloying；
(3) RH furnace refines, and to after RH, measures and record [O] (quality percentage of O in steel in steel with quick Determining oxygen probe Than) content, Steel ladle clearance control is in 420mm, molten steel and top slag thickness 86mm, and 1600 DEG C of liquid steel temperature, first progress RH is gently handled: true Reciprocal of duty cycle 425Pa is handled the time 15 minutes, is sequentially added corresponding alloy and is carried out alloying, as ferrosilicon, manganese iron, ferrochrome, molybdenum-iron, Ferro-niobium, ferrotianium and metal copper plate etc..Pyatyi vacuum pump is opened, reach capacity vacuum degree, carries out vacuum cycle processing；
(4) it has handled and has entered back into the refining of LF furnace, aluminum steel and titanium wire or Ti alloy, adjustment are successively fed before LF refining is outbound AlSWith the ingredient of Ti, the microalloying of B is finally carried out；
(5) conventional plate blank continuous casting is carried out, continuous casting is sealed using long nozzle protective casting and Ar, is wrapped in the middle carbon-free alkalinity of cladding lid Slag, using dedicated middle carbon abrasion resistant steel crystallizer protecting residue, at 16 DEG C, continuous casting process investment crystallizer electromagnetism is stirred for degree of superheat control It mixes, uses dynamic Continuous Casting Soft Reduction technique in fan-shaped section, pulling speed of continuous casting is controlled in 1m/min, thickness of strand 220mm；
(6) slab is cooled to room temperature, slab quality and surface is checked, take one layer of continuous casting billet surface epidermis off；
(7) it is sent into stove heating, in heating furnace heating time 300min, 1180 DEG C of heating temperature, slab goes out to heat furnace temperature 1150 DEG C of degree, is rolled using two-stage control.Recrystallization zone is rolled, rolling pass is reduced under equipment enabled condition, mentions High rolling pass reduction rate；And the residence time to increase the recrystallization quantity of deformed austenite keeps tissue equal after bundle is appropriately extended It homogenizes；
(8) go out the laggard horizontal high voltage water dephosphorization of heating furnace, dephosphorization pressure 16MPa；
(9) 5 passage roughing are carried out after dephosphorization；
(10) roughing it is complete to steel temperature drop to 900 DEG C or so, finish rolling final pass reduction ratio 7.8%, with guarantee thickness it is accurate and Plate shape is good, milling train exit thickness 12mm, and 860 DEG C of exit temperature at finishing；
(11) rolled piece goes out after milling train using ultra-fast cooling device cooling, and cooling rate is 15 DEG C/s, and quenching final temperature is 550 ℃；
(12) coiling machine batches, and it is cooling to carry out stacking；
(13) it send crosscutting heat treatment department to carry out out flat, opens usually 25 DEG C of steel roll temperature, open and ball blast is carried out to steel plate after putting down Processing removal scale on surface, shot blasting velocity≤2m/min, steel plate roughness is 25 μm after ball blast；
(14) steel plate upper and lower surface pellet is cleaned out before entering heat-treatment furnace, 900 DEG C of heat-treatment furnace heating temperature, is kept the temperature 2h is quenched；
(15) tempering is carried out when temperature is down to 300 DEG C；
(16) finishing is carried out in Precise asymptotics, examined.
The chemical component and its content that the slab obtained after conventional plate blank continuous casting is carried out in the present embodiment, in step (5) are: C is 0.21wt%, and Si 0.25wt%, Mn 1.55wt%, Cu 0.35wt%, Mo 0.40wt%, Cr 1.10wt%, Nb are 0.03wt%, Ti 0.03wt%, B 0.0010wt%, P 0.010wt%, S 0.002wt%, remaining is for Fe and unavoidably Impurity, through examining, the present embodiment production its yield strength of abrasion-resistant stee be 1150MPa, tensile strength 1325MPa, A50Extend Rate 11.5%, surface Brinell hardness 456HBW, under the conditions of -20 DEG C, Charpy V-arrangement ballistic work is respectively 61J, 63J, 65J, performance Meet NM400 standard GB/T/T24186-2009 technical conditions.
Embodiment 2
A kind of method of the ultrafast cold technique production thin gauge abrasion-resistant stee NM450 of hot continuous rolling, comprising steps of
It (1) is 1295 DEG C by temperature, [S] is that the molten iron of 0.018% (mass percent of S in molten iron) carries out the de- S of KR, so Dry slag is carried out afterwards and sufficiently takes off Slag treatment, and molten iron drossing to molten iron light area 96% reduces and returns S, molten iron terminal [S] in converter For 0.0010% (mass percent of S in molten iron)；
(2) before the new blow-on of converter 8 furnaces and it is big mend after preceding 3 furnace must not smelt this steel grade, make coolant, pellet with pellet It must be added as required with iron scale；Fluorite should be added on a small quantity in batches according to slag situation in furnace, steel additional amount 3.5kg per ton, Steel 5.0kg per ton when double slags, 2min forbids that fluorite is added before blowing end point, carries out double slag-stopping tappings using slag retaining cone, floating plug, Slag thickness 41mm, converter tapping ferrosilicon or silicomangan carry out component controlling.Deoxidation must not be carried out using material containing Al With alloying；
(3) RH furnace refines, and to after RH, measures and record [O] (quality percentage of O in steel in steel with quick Determining oxygen probe Than) content, Steel ladle clearance control is in 600mm, and molten steel and top slag thickness 95mm, liquid steel temperature: 1628 DEG C, first progress RH is gently handled: Vacuum degree 420Pa is handled the time 20 minutes, is sequentially added corresponding alloy and is carried out alloying, such as ferrosilicon, manganese iron, ferrochrome, molybdenum Iron, ferro-niobium, ferrotianium and metal copper plate etc..Pyatyi vacuum pump is opened, reach capacity vacuum degree, carries out vacuum cycle processing；
(4) it has handled and has entered back into the refining of LF furnace, aluminum steel and titanium wire or Ti alloy, adjustment are successively fed before LF refining is outbound AlSWith the ingredient of Ti, the microalloying of B is finally carried out；
(5) conventional plate blank continuous casting is carried out, continuous casting is sealed using long nozzle protective casting and Ar, is wrapped in the middle carbon-free alkalinity of cladding lid Slag, using dedicated middle carbon abrasion resistant steel crystallizer protecting residue, at 25 DEG C, continuous casting process investment crystallizer electromagnetism is stirred for degree of superheat control It mixes, uses dynamic Continuous Casting Soft Reduction technique in fan-shaped section, pulling speed of continuous casting is controlled in 1.2m/min, thickness of strand 220mm；
(6) slab is cooled to room temperature, slab quality and surface is checked, take one layer of continuous casting billet surface epidermis off；
(7) it is sent into stove heating, in heating furnace heating time 360min, 1260 DEG C of heating temperature, slab goes out to heat furnace temperature 1230 DEG C of degree, is rolled using two-stage control.Recrystallization zone is rolled, rolling pass is reduced under equipment enabled condition, mentions High rolling pass reduction rate；And the residence time to increase the recrystallization quantity of deformed austenite keeps tissue equal after bundle is appropriately extended It homogenizes；
(8) go out the laggard horizontal high voltage water dephosphorization of heating furnace, dephosphorization pressure 18MPa；
(9) 9 passage roughing are carried out after dephosphorization；
(10) roughing it is complete to steel temperature drop to 950 DEG C or so, finish rolling final pass reduction ratio 6.8%, with guarantee thickness it is accurate and Plate shape is good, milling train exit thickness 6mm, and 920 DEG C of exit temperature at finishing；
(11) rolled piece goes out after milling train using ultra-fast cooling device cooling, and cooling rate is 30 DEG C/s, and quenching final temperature is 650 ℃；
(12) coiling machine batches, and it is cooling to carry out stacking；
(13) it send crosscutting heat treatment department to carry out out flat, opens usually 55 DEG C of steel roll temperature, open and ball blast is carried out to steel plate after putting down Processing removal scale on surface, shot blasting velocity 4m/min, steel plate roughness is 50 μm after ball blast；
(14) steel plate upper and lower surface pellet is cleaned out before entering heat-treatment furnace, 950 DEG C of heat-treatment furnace heating temperature, is kept the temperature 1.5h is quenched；
(15) tempering is carried out when temperature is down to 3400 DEG C；
(16) finishing, sampling are carried out in Precise asymptotics.
The chemical component and its content of the slab obtained after conventional plate blank continuous casting are carried out in the present embodiment, in step (5) are as follows: C is 0.28wt%, and Si 0.38wt%, Mn 1.95wt%, Cu 0.45wt%, Mo 0.38wt%, Cr 0.8wt%, Nb are 0.04wt%, Ti 0.04wt%, B 0.0013wt%, P 0.010wt%, S 0.002wt%, remaining is for Fe and unavoidably Impurity.Through examining, the yield strength of the abrasion-resistant stee of the present embodiment production is 1210MPa, tensile strength 1375MPa, A50Extend Rate 10.5%, surface Brinell hardness 459HBW, under the conditions of -20 DEG C, Charpy V-arrangement ballistic work is respectively 70J, 61J, 65J, performance Meet NM400 standard GB/T/T24186-2009 technical conditions.
Embodiment 3
A kind of method of the ultrafast cold technique production thin gauge abrasion-resistant stee NM450 of hot continuous rolling, comprising steps of
It (1) is 1290 DEG C by temperature, [S] is that the molten iron of 0.018% (mass percent of S in molten iron) carries out the de- S of KR, so Dry slag is carried out afterwards and sufficiently takes off Slag treatment, and molten iron drossing to molten iron light area 96% reduces and returns S, molten iron terminal [S] in converter For 0.0010% (mass percent of S in molten iron), using whole gon technics, finishing slag basicity 3.2；
(2) before the new blow-on of converter 8 furnaces and it is big mend after preceding 3 furnace must not smelt this steel grade, make coolant, pellet with pellet It must be added as required with iron scale；Fluorite should be added on a small quantity in batches according to slag situation in furnace, steel additional amount 3.2kg per ton, Steel 4.5kg per ton when double slags, 2min forbids that fluorite is added before blowing end point, carries out double slag-stopping tappings using slag retaining cone, floating plug, Slag thickness 41mm, converter tapping ferrosilicon or silicomangan carry out component controlling, must not carry out deoxidation using material containing Al With alloying；
(3) RH furnace refines, and to after RH, measures and record [O] (quality percentage of O in steel in steel with quick Determining oxygen probe Than) content, Steel ladle clearance control is in 500mm, and molten steel and top slag thickness 80mm, liquid steel temperature: 1615 DEG C, first progress RH is gently handled: Vacuum degree 425Pa is handled the time 16 minutes, is sequentially added corresponding alloy and is carried out alloying, such as ferrosilicon, manganese iron, ferrochrome, molybdenum Iron, ferro-niobium, ferrotianium and metal copper plate etc..Pyatyi vacuum pump is opened, reach capacity vacuum degree, carries out vacuum cycle processing；
(4) it has handled and has entered back into the refining of LF furnace, aluminum steel and titanium wire or Ti alloy, adjustment are successively fed before LF refining is outbound AlSWith the ingredient of Ti, the microalloying of B is finally carried out；
(5) conventional plate blank continuous casting is carried out, continuous casting is sealed using long nozzle protective casting and Ar, is wrapped in the middle carbon-free alkalinity of cladding lid Slag, using dedicated middle carbon abrasion resistant steel crystallizer protecting residue, at 25 DEG C, continuous casting process investment crystallizer electromagnetism is stirred for degree of superheat control It mixes, uses dynamic Continuous Casting Soft Reduction technique in fan-shaped section, pulling speed of continuous casting is controlled in 1.1m/min, thickness of strand 220mm；
(6) slab is cooled to room temperature, slab quality and surface is checked, take one layer of continuous casting billet surface epidermis off；
(7) it is sent into stove heating, in heating furnace heating time 280min, 1240 DEG C of heating temperature, slab goes out to heat furnace temperature 1210 DEG C of degree, is rolled using two-stage control.Recrystallization zone is rolled, rolling pass is reduced under equipment enabled condition, mentions High rolling pass reduction rate；And the residence time to increase the recrystallization quantity of deformed austenite keeps tissue equal after bundle is appropriately extended It homogenizes；
(8) go out the laggard horizontal high voltage water dephosphorization of heating furnace, dephosphorization pressure 18MPa；
(9) 7 passage roughing are carried out after dephosphorization；
(10) roughing it is complete to steel temperature drop to 930 DEG C or so, finish rolling final pass reduction ratio 8.8%, with guarantee thickness it is accurate and Plate shape is good, milling train exit thickness 8mm, and 900 DEG C of exit temperature at finishing；
(11) rolled piece goes out after milling train using ultra-fast cooling device cooling, and cooling rate is 25 DEG C/s, and quenching final temperature is 600 ℃；
(12) coiling machine batches, and it is cooling to carry out stacking；
(13) it send crosscutting heat treatment department to carry out out flat, opens usually 25 DEG C of steel roll temperature, open and ball blast is carried out to steel plate after putting down Processing removal scale on surface, shot blasting velocity 3m/min, steel plate roughness is 35 μm after ball blast；
(14) steel plate upper and lower surface pellet is cleaned out before entering heat-treatment furnace, 920 DEG C of heat-treatment furnace heating temperature, is kept the temperature 1.8h is quenched；
(15) tempering is carried out when temperature is down to 350 DEG C；
(16) finishing, sampling are carried out in Precise asymptotics.
The chemical component and its content that the slab obtained after conventional plate blank continuous casting is carried out in the present embodiment, in step (5) are: C is 0.25wt%, and Si 0.30wt%, Mn 1.75wt%, Cu 0.41wt%, Mo 0.42wt%, Cr 0.92wt%, Nb are 0.06wt%, Ti 0.05wt%, B 0.0007wt%, P 0.010wt%, S 0.002wt%, remaining is for Fe and unavoidably Impurity.The yield strength of the abrasion-resistant stee of the present embodiment production is 1185MPa, tensile strength 1305MPa, A50Elongation percentage 12.5%, Surface Brinell hardness 449HBW, under the conditions of -20 DEG C, Charpy V-arrangement ballistic work is respectively 72J, 75J, 68J, and performance meets NM400 Standard GB/T/T24186-2009 technical conditions.
Embodiment 4
A kind of method of the ultrafast cold technique production thin gauge abrasion-resistant stee NM450 of hot continuous rolling, comprising steps of
It (1) is 1310 DEG C by temperature, [S] is that the molten iron of 0.018% (mass percent of S in molten iron) carries out the de- S of KR, so Dry slag is carried out afterwards and sufficiently takes off Slag treatment, and molten iron drossing to molten iron light area 96% reduces and returns S, molten iron terminal [S] in converter For 0.0010% (mass percent of S in molten iron), using whole gon technics, finishing slag basicity 3.2；
(2) carry out converter smelting, before the new blow-on of converter 8 furnaces and it is big mend after preceding 3 furnace must not smelt this steel grade, made with pellet Coolant, pellet and iron scale must be added as required；Fluorite should be added on a small quantity in batches according to slag situation in furnace, steel per ton Additional amount 3.2kg, whens double slags steel 4.5kg per ton, 2min forbids that fluorite is added before blowing end point, is filled in using slag retaining cone, pushing off the slag The double slag-stopping tappings of row, slag thickness 41mm, converter tapping ferrosilicon or silicomangan carry out component controlling.It must not be using containing Al Material carries out deoxidation and alloying；
(3) RH furnace refines, and to after RH, measures and record [O] (quality percentage of O in steel in steel with quick Determining oxygen probe Than) content, Steel ladle clearance control is in 480mm, and molten steel and top slag thickness 85mm, liquid steel temperature: 1625 DEG C, first progress RH is gently handled: Vacuum degree 445Pa is handled the time 18 minutes, is sequentially added corresponding alloy and is carried out alloying, such as ferrosilicon, manganese iron, ferrochrome, molybdenum Iron, ferro-niobium, ferrotianium and metal copper plate etc..Pyatyi vacuum pump is opened, reach capacity vacuum degree, carries out vacuum cycle processing；
(4) it has handled and has entered back into the refining of LF furnace, aluminum steel and titanium wire or Ti alloy, adjustment are successively fed before LF refining is outbound AlSWith the ingredient of Ti, the microalloying of B is finally carried out；
(5) conventional plate blank continuous casting is carried out, continuous casting is sealed using long nozzle protective casting and Ar, is wrapped in the middle carbon-free alkalinity of cladding lid Slag, using dedicated middle carbon abrasion resistant steel crystallizer protecting residue, at 20 DEG C, continuous casting process investment crystallizer electromagnetism is stirred for degree of superheat control It mixes, uses dynamic Continuous Casting Soft Reduction technique in fan-shaped section, pulling speed of continuous casting is controlled in 1.1m/min, thickness of strand 220mm；
(6) slab is cooled to room temperature, slab quality and surface is checked, take one layer of continuous casting billet surface epidermis off；
(7) it is sent into stove heating, in heating furnace heating time 290min, 1260 DEG C of heating temperature, slab goes out to heat furnace temperature 1220 DEG C of degree, is rolled using two-stage control.Recrystallization zone is rolled, rolling pass is reduced under equipment enabled condition, mentions High rolling pass reduction rate；And be appropriately extended and roll the rear residence time, to increase the recrystallization quantity of deformed austenite, keep tissue equal It homogenizes；
(8) go out the laggard horizontal high voltage water dephosphorization of heating furnace, dephosphorization pressure 18MPa；
(9) 7 passage roughing are carried out after dephosphorization；
(10) roughing it is complete to steel temperature drop to 930 DEG C or so, finish rolling final pass reduction ratio 6.5%, with guarantee thickness it is accurate and Plate shape is good, milling train exit thickness 10mm, and 900 DEG C of exit temperature at finishing；
(11) rolled piece goes out after milling train using ultra-fast cooling device cooling, and cooling rate is 20 DEG C/s, and quenching final temperature is 580 ℃；
(12) coiling machine batches, and it is cooling to carry out stacking；
(13) it send crosscutting heat treatment department to carry out out flat, opens usually 25 DEG C of steel roll temperature, open and ball blast is carried out to steel plate after putting down Processing removal scale on surface, shot blasting velocity 3m/min, steel plate roughness is 35 μm after ball blast；
(14) steel plate upper and lower surface pellet is cleaned out before entering heat-treatment furnace, 920 DEG C of heat-treatment furnace heating temperature, is kept the temperature 1.8h is quenched；
(15) tempering is carried out when temperature is down to 350 DEG C；
(16) finishing, sampling are carried out in Precise asymptotics.
The chemical component and its content that the slab obtained after conventional plate blank continuous casting is carried out in the present embodiment, in step (5) are: C is 0.20wt%, and Si 0.25wt%, Mn 1.75wt%, Cu 0.35wt%, Mo 0.40wt%, Cr 1.05wt%, Nb are 0.05wt%, Ti 0.04wt%, B 0.0007wt%, P 0.010wt%, S 0.002wt%, remaining is for Fe and unavoidably Impurity.The yield strength of the abrasion-resistant stee of the present embodiment production is 1195MPa, tensile strength 1315MPa, A50Elongation percentage 11.5%, Surface Brinell hardness 456HBW, under the conditions of -20 DEG C, Charpy V-arrangement ballistic work is respectively 60J, 67J, 61J, and performance meets NM400 Standard GB/T/T24186-2009 technical conditions.
The above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be to the present invention Embodiment restriction.For those of ordinary skill in the art, it can also make on the basis of the above description Other various forms of variations or variation.There is no necessity and possibility to exhaust all the enbodiments.It is all of the invention Made any modifications, equivalent replacements, and improvements etc., should be included in the protection of the claims in the present invention within spirit and principle Within the scope of.

Claims (4)

1. a kind of method of the ultrafast cold technique production thin gauge abrasion-resistant stee NM450 of hot continuous rolling, which is characterized in that comprising steps of
(1) by temperature > 1250 DEG C, the molten iron of [S]≤0.020% carries out KR and takes off S, then carries out dry slag and sufficiently takes off Slag treatment, iron Water is skimmed to molten iron light area >=93%, is reduced and is returned S in converter, and molten iron terminal [S]≤0.0020%, whole process uses Argon work Skill, finishing slag basicity 3.0-3.5；
(2) converter smelting is carried out, makees coolant with pellet, pellet and iron scale must be added as required；Fluorite answers root Be added on a small quantity in batches according to slag situation in furnace, steel additional amount≤3.5kg per ton, whens double slags steel≤5.0kg per ton, before blowing end point 2min forbids that fluorite is added, and carries out double slag-stopping tappings using slag retaining cone, floating plug, slag thickness≤42mm, converter tapping ferrosilicon or Person's silicomangan carries out component controlling, and must not carry out deoxidation and alloying using material containing Al；
(3) RH furnace refines, and to after RH, measures and record [O] content in steel with quick Determining oxygen probe, Steel ladle clearance control exists 400~600mm, molten steel and top slag thickness should be less than 100mm, and liquid steel temperature is 1595 DEG C -1630 DEG C, first carry out RH and gently handle: is true Reciprocal of duty cycle≤500Pa is handled time 15-20 minutes, is sequentially added corresponding alloy and is carried out alloying, opens Pyatyi vacuum pump, into The processing of row vacuum cycle；
(4) it has handled and has entered back into the refining of LF furnace, aluminum steel and titanium wire or Ti alloy are successively fed before LF refining is outbound, adjusted AlSWith The ingredient of Ti finally carries out the microalloying of B；
(5) conventional plate blank continuous casting is carried out, continuous casting is sealed using long nozzle protective casting and Ar, cinder inclusion in the middle carbon-free alkalinity of cladding lid, Using dedicated middle carbon abrasion resistant steel crystallizer protecting residue, at 15 ~ 25 DEG C, continuous casting process investment crystallizer electromagnetism is stirred for degree of superheat control It mixes, uses dynamic Continuous Casting Soft Reduction technique in fan-shaped section, pulling speed of continuous casting is controlled in 1.0 ~ 1.2m/min, thickness of strand 220mm；
(6) slab is cooled to room temperature, slab quality and surface is checked, take one layer of continuous casting billet surface epidermis off；
(7) it is sent into stove heating, in heating furnace heating time >=240min, 1180 ~ 1260 DEG C of heating temperature, slab goes out heating furnace Temperature >=1150 DEG C are rolled using two-stage control, and recrystallization zone is rolled, and rolling road is reduced under equipment enabled condition It is secondary, improve rolling pass reduction rate；And the residence time after bundle is appropriately extended；
(8) go out the laggard horizontal high voltage water dephosphorization of heating furnace, dephosphorization pressure >=16MPa；
(9) 5 ~ 9 passage roughing are carried out after dephosphorization；
(10) roughing it is complete to steel temperature drop to 900~950 DEG C or so, carry out the rolling of austenite non-recrystallization zone, guarantee non-recrystallization The total reduction in area is greater than 45%, and 3 percentage pass reductions to the greatest extent may be used before suitably increasing reduction in pass, especially finish rolling by rolling power Can be larger, finishing temperature control as far as possible close to Ar3 phase transition temperature, final pass reduction ratio≤12%, to guarantee that thickness is smart Really and plate shape is good；
(11) rolled piece goes out cooling using ultra-fast cooling device after milling train, and cooling rate is 15 ~ 30 DEG C/s, and quenching final temperature is 550 ~ 650℃；
(12) coiling machine batches, and it is cooling to carry out stacking；
(13) it send crosscutting heat treatment department to carry out out flat, opens usually steel roll temperature≤60 DEG C, open and steel plate is carried out at ball blast after putting down Reason removal scale on surface；
(14) steel plate upper and lower surface pellet is cleaned out before entering heat-treatment furnace, 900~950 DEG C of heat-treatment furnace heating temperature, is protected 1.5~2h of temperature, is quenched；
(15) tempering is carried out when temperature is down to 300~400 DEG C；
(16) finishing, inspection are carried out in Precise asymptotics；
The chemical component and its content of the slab obtained after conventional plate blank continuous casting are carried out in step (5) are as follows: C is 0.20~ 0.30wt%, Si are 0.2~0.4wt%, and Mn is 1.5~2.0wt%, and Cu is 0.3~0.50wt%, and Mo is 0.35~0.55wt%, Cr For 0.75~1.20wt%, Nb is 0.03~0.06wt%, and Ti is 0.02~0.05wt%, and B is 0.0006~0.0015wt%, P < 0.015wt%, S < 0.010wt%, remaining is Fe and impurity.
2. according to the method described in claim 1, it is characterized by: in step (2), before the new blow-on of converter 8 furnaces and it is big mend after preceding 3 Furnace must not smelt identical steel grade.
3. according to the method described in claim 1, it is characterized by: in step (13), shot blasting velocity≤2 ~ 4m/min, after ball blast Steel plate roughness is 25-55 μm.
4. according to the method described in claim 1, it is characterized by: 6 ~ 12mm of the milling train exit thickness is smart in step (10) Roll 860~920 DEG C of outlet temperature.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105200337A (en) * 2014-06-23 2015-12-30 鞍钢股份有限公司 High-strength abrasion-resisting steel plate and production method thereof
CN106498295A (en) * 2016-11-17 2017-03-15 哈尔滨光霞金属材料有限公司 High-strength abrasion-proof steel and its manufacture method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4120253B2 (en) * 2002-04-03 2008-07-16 日立金属株式会社 Quenched alloy for nanocomposite magnet and method for producing the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105200337A (en) * 2014-06-23 2015-12-30 鞍钢股份有限公司 High-strength abrasion-resisting steel plate and production method thereof
CN106498295A (en) * 2016-11-17 2017-03-15 哈尔滨光霞金属材料有限公司 High-strength abrasion-proof steel and its manufacture method

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