CN107099727B - A kind of method of ultrafast cold press quenching production thin gauge abrasion-resistant stee NM400 - Google Patents

A kind of method of ultrafast cold press quenching production thin gauge abrasion-resistant stee NM400 Download PDF

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CN107099727B
CN107099727B CN201710204540.5A CN201710204540A CN107099727B CN 107099727 B CN107099727 B CN 107099727B CN 201710204540 A CN201710204540 A CN 201710204540A CN 107099727 B CN107099727 B CN 107099727B
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steel
temperature
continuous casting
slag
furnace
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CN107099727A (en
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李烈军
周峰
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

Abstract

The invention discloses the method for ultrafast cold press quenching production thin gauge abrasion-resistant stee NM400 a kind of, comprising steps of blast-melted, molten iron pretreatment, converter smelting, the refining of RH furnace, the refining of F furnace, conventional plate blank continuous casting, be cooled to room temperature, slab inspection, casting billet surface strips off the skin, heating furnace, high pressure water dephosphorization, roughing, high pressure water dephosphorization, finish rolling, ultra-rapid cooling is quenched, batched, holding pit keeps the temperature, opens flat, 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, technique is simplified, 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

A kind of method of ultrafast cold press quenching production thin gauge abrasion-resistant stee NM400
Technical field
The invention belongs to wear-resisting steel plate manufacturing technology fields.More particularly to the ultrafast cold press quenching production thin gauge of one kind is resistance to The method for grinding steel NM400.
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 of 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 of 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 ultrafast cold press quenching production thin gauge abrasion-resistant stee NM400 a kind of, using biography System hot continuous rolling production line combines ultrafast cold technique to obtain more excellent finer and closely woven microstructure, and has high wear-resisting property, weldering Performance and corrosion resistance are connect, and can manufacture the good thin gauge abrasion-resistant stee of plate shape, production cost is reduced, shortens friendship The goods period.
To achieve the above object, the technical solution adopted by the present invention is that:
A kind of method of ultrafast cold press quenching production thin gauge abrasion-resistant stee NM400, comprising steps of
(1) molten iron of temperature > 1250 DEG C, [S]≤0.020% are subjected to KR and take off S, then carry out dry slag and the place that sufficiently skims Reason, molten iron drossing to molten iron light area >=90% reduce and return S, molten iron terminal [S]≤0.0020% in converter；
(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≤4kg per ton, whens double slags steel≤5.5kg 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≤45mm, 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, 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 ~ 30 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, 1200 ~ 1280 DEG C of heating temperature, slab goes out to add Hot stove temperature >=1150 DEG C, are rolled using two-stage control, and recrystallization zone is rolled, and rolling is reduced under equipment enabled condition Passage improves rolling pass reduction rate, and the residence time after bundle is appropriately extended, to increase the recrystallization quantity of deformed austenite, Make microstructure homogenization；
(8) go out the laggard horizontal high voltage water dephosphorization of heating furnace, dephosphorization pressure >=12MPa；
(9) 5 ~ 9 passage roughing are carried out after dephosphorization；
(10) roughing it is complete to steel temperature drop to 900~950 °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；
(11) rolled piece is quenched after going out milling train using ultra-fast cooling device, and cooling rate is 30 ~ 80 DEG C/s, and quenching final temperature is 300~400℃；
(12) coiling machine batches, and holding pit is sent to keep the temperature 6 ~ 10 hours；
(13) flat, finishing is carried out out in skin pass mill group, is examined.
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: casting The chemical component and its content of base are as follows: C is 0.16~0.25wt%, and Si is 0.2~0.4wt%, and Mn is 1.5~2.0wt%, and Cu is 0.2~0.40wt%, Mo are 0.25~0.40wt%, and Cr is 0.30~0.50wt%, and Nb is 0.03~0.06wt%, Ti 0.01 ~0.03wt%, B are 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 (10), milling train 6 ~ 12mm of 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.It specifically includes: blast-melted → molten iron pretreatment → converter smelting → RH furnace refining → LF furnace refining → conventional plate Base continuous casting → be cooled to room temperature → slab inspection → casting billet surface strips off the skin → heating furnace → high pressure water dephosphorization → roughing → high pressure water Dephosphorization → finish rolling → ultra-rapid cooling quenches → batches → holding pit is kept the temperature → and opens flat → finishing → inspection.
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 ultrafast cold press quenching production thin gauge abrasion-resistant stee NM400, comprising steps of
It (1) is 1255 DEG C by temperature, that [S] is that the qualified molten iron of 0.019% (mass percent of S in molten iron) first carries out KR is de- It carries out taking off Slag treatment after S, de- S, molten iron light area is 95%, molten iron terminal [the S] (quality of S in molten iron that is 0.0010% Percentage), whole process uses gon technics, finishing slag basicity 3.5；
(2) converter smelting is carried out, pellet is added and iron scale makees coolant；Steel additional amount per ton is added portionwise in fluorite 3.1kg, 2min forbids that fluorite is added before blowing end point, carries out double slag-stopping tappings using slag retaining cone, floating plug, and slag thickness is 44mm, Converter tapping carries out component controlling with ferrosilicon；
(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, liquid steel temperature: Steel ladle clearance 410mm, molten steel and top slag thickness 95mm 1598 DEG C, first carry out RH and gently handle: vacuum degree 498Pa is handled the time 15 minutes, is sequentially added different alloy and is carried out alloying, as ferrosilicon, manganese iron, ferrochrome, molybdenum-iron, ferro-niobium, Ferrotianium and metal copper plate etc. open 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 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 1.0m/min, thickness of strand 220mm；
(6) slab is cooled to room temperature, checks slab quality and surface, takes one layer of continuous casting billet surface epidermis off；
(7) it is sent into stove heating, in heating furnace heating time 300min, 1210 DEG C of heating temperature, slab goes out to heat furnace temperature 1190 DEG C of degree, is rolled using two-stage control, and 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 14MPa；
(9) 5 passage roughing are carried out after dephosphorization；
(10) roughing it is complete to steel temperature drop to 900 °C or so, finish rolling is carried out after dephosphorization again, 3 percentage pass reductions point before finish rolling Not Wei 42.1%, 32.5%, 31.2%, last 1 percentage pass reduction be 7.2%, milling train exit thickness be 12mm.Exit temperature at finishing 870℃；
(11) rolled piece is quenched after going out milling train using ultra-fast cooling device, and cooling rate is 30 DEG C/s, and quenching final temperature is 310 ℃；
(12) coiling machine batches, and holding pit is sent to keep the temperature 10 hours；
(13) flat, finishing is carried out out in skin pass mill group, is 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 0.16wt%, and Si 0.25wt%, Mn 1.95wt%, Cu 0.25wt%, Mo 0.35wt%, Cr 0.32wt%, Nb are 0.031wt%, Ti 0.011wt%, B 0.0007wt%, P 0.010wt%, S 0.002wt%, remaining is Fe and can not keep away The impurity exempted from.Through examining, the yield strength of products obtained therefrom shown in this is 1110MPa, tensile strength 1295MPa, A50Elongation percentage 13.5%, surface Brinell hardness 411HBW, under the conditions of -20 DEG C, Charpy V-arrangement ballistic work is respectively 74J, 65J, 68J, and performance is full Sufficient NM400 standard GB/T/T24186-2009 technical conditions.
Embodiment 2
A kind of method of ultrafast cold press quenching production thin gauge abrasion-resistant stee NM400, comprising steps of
It (1) is that the qualified molten iron of 0.012% (mass percent of S in molten iron) first carries out the de- S of KR by 1255 DEG C of temperature, [S], It carries out taking off Slag treatment after de- S, molten iron light area is 94%, molten iron terminal [the S] (quality hundred of S in molten iron that is 0.0010% Divide ratio), using whole gon technics, finishing slag basicity 3.0；
(2) pellet is added and iron scale makees coolant, steel additional amount 3.0kg per ton is added portionwise in fluorite, and blowing is eventually 2min forbids that fluorite is added before point, carries out double slag-stopping tappings using slag retaining cone, floating plug, slag thickness is 40mm, converter tapping silicon Iron carries out component controlling；
(3) RH furnace refines, and to after RH, measures and record [O] (quality hundred of O in steel in steel with quick Determining oxygen probe Divide ratio) content, liquid steel temperature: Steel ladle clearance 490mm, molten steel and top slag thickness 85mm 1610 DEG C, first carry out RH and gently handle: vacuum 495Pa is spent, is handled the time 20 minutes, different alloys is sequentially added and carries out alloying, such as ferrosilicon, manganese iron, ferrochrome, molybdenum-iron, niobium Iron, ferrotianium and metal copper plate etc. open 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 28 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 280min, 1270 DEG C of heating temperature, slab goes out to heat furnace temperature 1250 DEG C of degree, is rolled using two-stage control, and 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 14MPa；
(9) 7 passage roughing are carried out after dephosphorization；
(10) roughing it is complete to steel temperature drop to 950 °C or so, finish rolling is carried out after dephosphorization again, 3 percentage pass reductions point before finish rolling Not Wei 39.1%, 34.5%, 30.2%, last 1 percentage pass reduction be 6.8%, milling train exit thickness be 10mm.Exit temperature at finishing 900℃；
(11) rolled piece is quenched after going out milling train using ultra-fast cooling device, and cooling rate is 45 DEG C/s, and quenching final temperature is 350 ℃；
(12) coiling machine batches, and holding pit is sent to keep the temperature 8 hours；
(13) flat, finishing is carried out out in skin pass mill group, is 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 0.24wt%, and Si 0.25wt%, Mn 1.55wt%, Cu 0.20wt%, Mo 0.30wt%, Cr 0.48wt%, Nb are 0.035wt%, Ti 0.018wt%, B 0.0009wt%, P 0.010wt%, S 0.002wt%, remaining is Fe and can not keep away The impurity exempted from.
By examining, the yield strength of the product of the present embodiment is 1120MPa, tensile strength 1305MPa, A50Elongation percentage 12.5%, surface Brinell hardness 401HBW, under the conditions of -20 DEG C, Charpy V-arrangement ballistic work is respectively 71J, 62J, 65J, and performance is full Sufficient NM400 standard GB/T/T24186-2009 technical conditions.
Embodiment 3
A kind of method of ultrafast cold press quenching production thin gauge abrasion-resistant stee NM400, comprising steps of
It (1) is 1295 DEG C by temperature, [S] is that 0.017% (mass percent of S in molten iron) molten iron first carries out the de- S of KR, de- S After take off Slag treatment, molten iron light area is 95%, molten iron terminal [S] (the quality percentage of S in molten iron that is 0.0010% Than), using whole gon technics, finishing slag basicity 4.0；
(2) pellet is added and iron scale makees coolant；Steel additional amount 4.0kg per ton is added portionwise in fluorite, and blowing is eventually 2min forbids that fluorite is added before point, carries out double slag-stopping tappings using slag retaining cone, floating plug, slag thickness is 35mm, converter tapping silicon Iron carries out component controlling；
(3) RH furnace refines, and to after RH, measures and record [O] (quality hundred of O in steel in steel with quick Determining oxygen probe Divide ratio) content, liquid steel temperature: Steel ladle clearance 580mm, molten steel and top slag thickness 75mm 1625 DEG C, first carry out RH and gently handle: vacuum 495Pa is spent, is handled the time 20 minutes, different alloys is sequentially added and carries out alloying, such as ferrosilicon, manganese iron, ferrochrome, molybdenum-iron, niobium Iron, ferrotianium and metal copper plate etc. open 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 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 280min, 1250 DEG C of heating temperature, slab goes out to heat furnace temperature 1220 DEG C of degree, is rolled using two-stage control, and 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 14MPa；
(9) 9 passage roughing are carried out after dephosphorization；
(10) roughing it is complete to steel temperature drop to 920 °C or so, finish rolling is carried out after dephosphorization again, 3 percentage pass reductions point before finish rolling Not Wei 31.1%, 28.5%, 27.2%, last 1 percentage pass reduction be 5.8%, milling train exit thickness be 6mm, exit temperature at finishing 920 ℃；
(11) rolled piece is quenched after going out milling train using ultra-fast cooling device, and cooling rate is 75 DEG C/s, and quenching final temperature is 400 ℃；
(12) coiling machine batches, and holding pit is sent to keep the temperature 6 hours；
(13) flat, finishing is carried out out in skin pass mill group, is 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: The chemical component and its content of slab are: C 0.20wt%, Si 0.38wt%, Mn 1.70wt%, Cu 0.38wt%, Mo are 0.38wt%, Cr 0.40wt%, Nb 0.055wt%, Ti 0.028wt%, B 0.0012wt%, P 0.010wt%, S are 0.001wt%, remaining is Fe and inevitable impurity.
By examining, the product yield strength of the present embodiment is 1140MPa, tensile strength 1325MPa, A50Elongation percentage 11.5%, surface Brinell hardness 422HBW, under the conditions of -20 DEG C, Charpy V-arrangement ballistic work is respectively 68J, 73J, 65J, and performance is full Sufficient NM400 standard GB/T/T24186-2009 technical conditions.
Embodiment 4
A kind of method of ultrafast cold press quenching production thin gauge abrasion-resistant stee NM400, comprising steps of
It (1) is 1295 DEG C by temperature, [S] is that 0.017% (mass percent of S in molten iron) molten iron first carries out the de- S of KR, takes off S After take off Slag treatment, molten iron light area is 95%, molten iron terminal [S] (the quality percentage of S in molten iron that is 0.0010% Than), using whole gon technics, finishing slag basicity 4.0；
(2) pellet is added and iron scale makees coolant；Steel additional amount 4.0kg per ton is added portionwise in fluorite, using gear Slag cone, floating plug carry out double slag-stopping tappings, and slag thickness is 35mm, and converter tapping carries out component controlling with ferrosilicon
(3) RH furnace refines, and to after RH, measures and record [O] (quality hundred of O in steel in steel with quick Determining oxygen probe Divide ratio) content, liquid steel temperature: Steel ladle clearance 580mm, molten steel and top slag thickness 75mm 1625 DEG C, first carry out RH and gently handle: vacuum 495Pa is spent, is handled the time 20 minutes, different alloys is sequentially added and carries out alloying, such as ferrosilicon, manganese iron, ferrochrome, molybdenum-iron, niobium Iron, ferrotianium and metal copper plate etc. open 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 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 320min, 1250 DEG C of heating temperature, slab goes out to heat furnace temperature 1220 DEG C of degree, is rolled using two-stage control, and 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 °C or so, finish rolling is carried out after dephosphorization again, 3 percentage pass reductions point before finish rolling Not Wei 38.1%, 35.5%, 27.2%, last 1 percentage pass reduction be 7.8%, milling train exit thickness be 8mm.Exit temperature at finishing 910 ℃；
(11) rolled piece is quenched after going out milling train using ultra-fast cooling device, and cooling rate is 55 DEG C/s, and quenching final temperature is 350 ℃；
(12) coiling machine batches, and holding pit is sent to keep the temperature 8 hours；
(13) flat, finishing is carried out out in skin pass mill group, is 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: The chemical component and its content of slab are: C 0.20wt%, Si 0.38wt%, Mn 1.70wt%, Cu 0.38wt%, Mo are 0.38wt%, Cr 0.40wt%, Nb 0.055wt%, Ti 0.028wt%, B 0.0012wt%, P 0.010wt%, S are 0.001wt%, remaining is Fe and inevitable impurity.
Through detecting, its yield strength of the product of the present embodiment is 1175MPa, tensile strength 1305MPa, A50Elongation percentage 10.5%, surface Brinell hardness 402HBW, under the conditions of -20 DEG C, Charpy V-arrangement ballistic work is respectively 58J, 63J, 55J, and performance is full Sufficient 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 ultrafast cold press quenching production thin gauge abrasion-resistant stee NM400, 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 >=90%, is reduced and is returned S, molten iron terminal [S]≤0.0020% in converter；
(2) converter smelting is carried out, whole process uses gon technics, and finishing slag basicity 3.0-4.0 makees 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≤4kg per ton, Steel≤5.5kg per ton when double slags, 2min forbids that fluorite is added before blowing end point, carries out double pushing off the slag using slag retaining cone, floating plug and goes out Steel, slag thickness≤45mm, converter tapping ferrosilicon or silicomangan carry out component controlling, and must not using material containing Al into Row deoxidation and alloying；
(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 ~ 30 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, 1200 ~ 1280 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, rolling pass reduction rate is improved, and the residence time after bundle is appropriately extended；
(8) go out the laggard horizontal high voltage water dephosphorization of heating furnace, dephosphorization pressure >=12MPa；
(9) 5 ~ 9 passage roughing are carried out after dephosphorization；
(10) roughing it is complete to steel temperature drop to 900~950 °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 is controlled as far as possible in close-Ar3Phase transition temperature, final pass reduction ratio≤12%, to guarantee thickness Accurate and plate shape is good；
(11) rolled piece is gone out after milling train and is quenched using ultra-fast cooling device, and cooling rate is 30 ~ 80 DEG C/s, and quenching final temperature is 300 ~ 400℃；
(12) coiling machine batches, and holding pit is sent to keep the temperature 6 ~ 10 hours；
(13) flat, finishing is carried out out in skin pass mill group, is examined.
2. the method according to claim 1, wherein carrying out the casting obtained after conventional plate blank continuous casting in step (5) The chemical component and its content of base are as follows: the chemical component and its content of slab are as follows: C be 0.16~0.25wt%, Si be 0.2~ 0.4wt%, Mn are 1.5~2.0wt%, and Cu is 0.2~0.40wt%, and Mo is 0.25~0.40wt%, and Cr is 0.30~0.50wt%, Nb be 0.03~0.06wt%, Ti be 0.01~0.03wt%, B be 0.0006~0.0015wt%, P < 0.015wt%, S < 0.010wt%, remaining is Fe and impurity.
3. 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.
4. according to the method described in claim 1, it is characterized by: milling train 6 ~ 12mm of exit thickness, finish rolling goes out in step (10) 860~920 DEG C of temperature of mouth.
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