CN107099727A - A kind of ultrafast cold press quenching production Thin Specs abrasion-resistant stee NM400 method - Google Patents

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

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CN107099727A
CN107099727A CN201710204540.5A CN201710204540A CN107099727A CN 107099727 A CN107099727 A CN 107099727A CN 201710204540 A CN201710204540 A CN 201710204540A CN 107099727 A CN107099727 A CN 107099727A
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steel
temperature
slag
continuous casting
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CN107099727B (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 a kind of ultrafast cold press quenching production Thin Specs abrasion-resistant stee NM400 method, including step：Blast-melted, molten iron pretreatment, converter smelting, the refining of RH stoves, the refining of F stoves, conventional plate blank continuous casting, it is cooled to that room temperature, slab inspection, casting billet surface are stripped off the skin, heating furnace, water under high pressure dephosphorization, roughing, water under high pressure dephosphorization, finish rolling, ultra-rapid cooling are quenched, batched, holding pit insulation, opens flat, finishing, inspection.The present invention carries out microalloying by rational Alloying Design from micro Cu, Mo, Cr, Nb, Ti, B alloy, passes through ultra-rapid cooling quenching control microstructure after controlled rolling, give full play to the hydrodynamics effect of alloy, the addition of alloy and the usage amount of precious alloy are reduced, technique is simplified, compared with traditional handicraft, reduce energy consumption, technological process is shortened, alloy addition is reduced, the tough proportioning of steel is improved, social resources are saved, production cost is reduced.

Description

A kind of ultrafast cold press quenching production Thin Specs abrasion-resistant stee NM400 method
Technical field
The invention belongs to wear-resisting steel plate manufacturing technology field.More particularly to the ultrafast cold press quenching production Thin Specs of one kind are resistance to The method for grinding steel NM400.
Background technology
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 flow of wear-resisting steel plate is：Electric furnace（Converter）Smelting → refining → continuous casting → heating → roughing → Middle base → finish rolling → heat treatment → inspection storage, current country's main manufacturer has Wugang, Wuhan Iron and Steel Plant, Baosteel, Nangang, uses Heavy and medium plate mill or continuous hot-rolling mill are produced compared with think gauge product, and Thin Specs production is difficult, and production cost is high, and plate shape is difficult to protect Card, the production cycle is long, and delivery date is difficult to ensure that, because the yield of domestic Thin Specs wear-resisting steel plate is seldom, it is difficult to meet domestic city The need for, advantage of the external product in quality, and part project with foreign funds machine-building unit are added to abrasion-resistant stee material Be distinctly claimed, cause external the wear-resisting steel plate more occupancy volume in market and the higher market price at home.City of the current country The wear-resisting steel plate of field Thin Specs is mainly Sweden HARDAX, Japan JFE, Germany XAR and the product of Luo Qi steel mills of Finland, and the country is opened Send superior in quality Thin Specs wearing plate and be obviously promoted effect to improving the performance of enterprises and the domestic steel industry structure of adjustment.
The content of the invention
It is an object of the present invention to provide a kind of ultrafast cold press quenching production Thin Specs abrasion-resistant stee NM400 method, using biography System hot continuous rolling production line obtains more excellent finer and closely woven microstructure with reference to ultrafast cold technique, and with high anti-wear performance, weldering Performance and corrosion resistance are connect, and can manufacture the good Thin Specs abrasion-resistant stee of plate shape, production cost is reduced, shortens friendship The goods cycle.
To achieve the above object, the technical solution adopted by the present invention is：
A kind of ultrafast cold press quenching production Thin Specs abrasion-resistant stee NM400 method, including step：
（1）By temperature>1250 DEG C, the molten iron progress de- S of KR of [S]≤0.020%, then carry out dry slag and fully take off Slag treatment, iron Water is skimmed to bright area >=90% of molten iron, reduces and S, molten iron terminal [S]≤0.0020% are returned in converter；
（2）Converter smelting is carried out, makees cooling agent with pellet, pellet and iron scale must be added on request；Fluorite answers root Added on a small quantity in batches according to slag situation in stove, steel addition≤4kg per ton, 2min before steel≤5.5kg per ton, blowing end point during double slags Forbid to add fluorite, double slag-stopping tappings, slag thickness≤45mm, converter tapping ferrosilicon or silicon are carried out using slag retaining cone, floating plug Manganese alloy carries out component controlling, and must not carry out deoxidation and alloying using material containing Al；
（3）RH stoves are refined, to after RH, determine and record [O] content in steel with quick Determining oxygen probe, and 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 carries out RH and gently handles：Very Reciprocal of duty cycle≤500Pa, processing time 15-20 minute, sequentially adds corresponding alloy and carries out alloying, open Pyatyi vavuum pump, enter The processing of row vacuum cycle；
（4）Handle and entered back into the refining of LF stoves, fed aluminum steel and titanium wire or Ti alloys before LF refining is outbound successively, adjusted AlSWith Ti composition, finally carries out B microalloying；
（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 alkalescence of cladding lid, Using special middle carbon abrasion resistant steel crystallizer protecting residue, degree of superheat control is at 15 ~ 30 DEG C, and casting process input crystallizer electromagnetism is stirred Mix, in fan-shaped section using dynamic Continuous Casting Soft Reduction technique, 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 are checked, one layer of continuous casting billet surface epidermis is taken off；
（7）Feeding stove heat, heat time >=240min in heating furnace, 1200 ~ 1280 DEG C of heating-up temperature, slab goes out heating furnace Temperature >=1150 DEG C, are rolled using two-stage control, are rolled for recrystallization zone, and rolling road is reduced under equipment enabled condition It is secondary, the residence time after rolling pass reduction ratio, and proper extension bundle is improved, to increase the recrystallization quantity of deformed austenite, is made 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 is complete to treat steel temperature drop to 900~950 °C or so, carries out the non-recrystallization zone rolling of austenite, it is ensured that non-recrystallization The total reduction in area is more than 45%, suitably increases 3 percentage pass reductions before reduction in pass, particularly finish rolling by rolling power and to the greatest extent may be used Can be larger, it is that subsequent austenite creates favorable conditions to ferritic phase deformed nucleus, increases nucleation sites, to reach refinement iron The purpose of ferritic crystal grain, finishing temperature is controlled close to Ar3 phase transition temperatures as far as possible, final pass reduction ratio≤12%, to ensure Thickness is accurate and plate shape is good；
（11）Rolled piece go out after milling train using ultra-fast cooling device quench, cooldown rate be 30 ~ 80 DEG C/s, quenching final temperature be 300 ~ 400℃；
（12）Coiling machine is batched, and send holding pit to be incubated 6 ~ 10 hours；
（13）Carry out opening flat in skin pass mill group, finishing is examined.
Further, step（5）The middle chemical composition of strand and its content that obtained after conventional plate blank continuous casting are：Casting The chemical composition and its content of base be：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%, and Ti is 0.01 ~0.03wt%, B are 0.0006~0.0015wt%, P<0.015wt%, S<0.010wt%, remaining is Fe and impurity.
Further, step（2）In, before the new blow-on of converter 8 stoves and it is big mend after preceding 3 stove must not smelt identical steel grade.
Further, step（10）In, milling train 6 ~ 12mm of exit thickness, 860~920 DEG C of exit temperature at finishing.
The present invention carries out continuous casting after refining molten iron and steel scrap through pneumatic steelmaking and RH+LF stoves, hot rolling, press quenching is protected The insulation of temperature hole.Specifically include：Blast-melted → molten iron pretreatment → converter smelting → RH stoves refining → LF stoves refining → conventional plate Base continuous casting → be cooled to room temperature → slab inspection → casting billet surface strips off the skin → heating furnace → water under high pressure dephosphorization → roughing → water under high pressure Dephosphorization → finish rolling → ultra-rapid cooling is quenched → batches → holding pit is incubated → and opens flat → finishing → inspection.
The present invention carries out microalloy by rational Alloying Design from micro Cu, Mo, Cr, Nb, Ti, B alloy Change, by ultra-rapid cooling quenching control microstructure after controlled rolling, give full play to the hydrodynamics effect of alloy, reduce and close The addition of gold and the usage amount of precious alloy, and simplify after traditional abrasion-resistant stee hot rolling progress out-line quenching+tempering process, Using the method compared with traditional handicraft, energy consumption is reduced, technological process is shortened, alloy addition is reduced, improved The tough proportioning of steel, saves social resources, reduces production cost.
Embodiment
With reference to embodiment, the invention will be further described, not limiting the scope of the invention.
Embodiment 1
A kind of ultrafast cold press quenching production Thin Specs abrasion-resistant stee NM400 method, including step：
(1) be 1255 DEG C by temperature, [S] be that 0.019% (S mass percent in molten iron) qualified molten iron first carries out KR and takes off S, take off S Carry out skimming processing after end, molten iron light area is 95%, molten iron terminal [S] (S quality percentage in molten iron for 0.0010% Than), whole process uses gon technics, finishing slag basicity 3.5；
(2) converter smelting is carried out, pellet is added and iron scale makees cooling agent；Steel addition per ton is added portionwise in fluorite 2min forbids to add fluorite before 3.1kg, blowing end point, and double slag-stopping tappings are carried out using slag retaining cone, floating plug, and slag thickness is 44mm, Converter tapping carries out component controlling with ferrosilicon；
(3) RH stoves are refined, to after RH, determine and record [O] (the O mass percent in steel) in steel with quick Determining oxygen probe Content, Steel ladle clearance 410mm, molten steel and top slag thickness 95mm, liquid steel temperature：1598 DEG C, first carry out RH and gently handle：Vacuum 498Pa, 15 minutes processing times, sequentially adds different alloys and carries out alloyings, such as ferrosilicon, ferromanganese, ferrochrome, molybdenum-iron, ferro-niobium, Ferrotianium and metal copper plate etc., open Pyatyi vavuum pump, carry out vacuum cycle processing；
(4) handled and entered back into the refining of LF stoves, fed aluminum steel and titanium wire or Ti alloys before LF refining is outbound successively, adjusted AlSWith Ti composition, finally carries out B microalloying；
(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 alkalescence of cladding lid, Using special middle carbon abrasion resistant steel crystallizer protecting residue, degree of superheat control is at 16 DEG C, and casting process puts into M-EMS, Fan-shaped section is controlled in 1.0m/min, thickness of strand 220mm using dynamic Continuous Casting Soft Reduction technique, pulling speed of continuous casting；
(6) slab is cooled to room temperature, and slab quality and surface are checked, takes one layer of continuous casting billet surface epidermis off；
(7) feeding stove heat, the heat time 300min in heating furnace, 1210 DEG C of heating-up temperature, slab goes out furnace temp 1190 DEG C, rolled using two-stage control, rolled for recrystallization zone, rolling pass is reduced under equipment enabled condition, improved Residence time after rolling pass reduction ratio, and proper extension bundle, to increase the recrystallization quantity of deformed austenite, make even tissue Change；
(8) the laggard horizontal high voltage water dephosphorization of heating furnace, dephosphorization pressure 14MPa are gone out；
(9) 5 passage roughing are carried out after dephosphorization；
(10) roughing is complete treats that steel temperature drop, to 900 °C or so, carries out finish rolling, 3 percentage pass reductions are respectively before finish rolling again after dephosphorization 42.1%, 32.5%, 31.2%, last 1 percentage pass reduction is 7.2%, and milling train exit thickness is 12mm.870 DEG C of exit temperature at finishing；
(11) rolled piece goes out using ultra-fast cooling device quenching after milling train, and cooldown rate is 30 DEG C/s, and quenching final temperature is 310 DEG C；
(12) coiling machine is batched, and send holding pit to be incubated 10 hours；
(13) carry out opening flat in skin pass mill group, finishing is examined.
In the present embodiment, step（5）The middle chemical composition of strand and its content that obtained after conventional plate blank continuous casting are： C is 0.16wt%, and Si is 0.25wt%, and Mn is 1.95wt%, and Cu is 0.25wt%, and Mo is 0.35wt%, and Cr is 0.32wt%, and Nb is 0.031wt%, Ti are 0.011wt%, and B is 0.0007wt%, and P is 0.010wt%, and S is 0.002wt%, and remaining is Fe and can not kept 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 its performance expires Sufficient NM400 standard GB/Ts/T24186-2009 technical conditions.
Embodiment 2
A kind of ultrafast cold press quenching production Thin Specs abrasion-resistant stee NM400 method, including step：
(1) it is that 0.012% (S mass percent in molten iron) qualified molten iron first carries out the de- S of KR by 1255 DEG C of temperature, [S], takes off S knots Processing of skimming is carried out after beam, molten iron light area is 94%, and molten iron terminal [S] is 0.0010% (S mass percent in molten iron), Using whole gon technics, finishing slag basicity 3.0；
(2) add pellet and iron scale makees cooling agent, fluorite is added portionwise before steel addition 3.0kg per ton, blowing end point 2min forbids to add fluorite, and double slag-stopping tappings are carried out using slag retaining cone, floating plug, and slag thickness is 40mm, and converter tapping is entered with ferrosilicon Row component controlling；
(3) RH stoves are refined, to after RH, determine and record [O] (the O mass percent in steel) in steel with quick Determining oxygen probe Content, Steel ladle clearance 490mm, molten steel and top slag thickness 85mm, liquid steel temperature：1610 DEG C, first carry out RH and gently handle：Vacuum 495Pa, 20 minutes processing times, sequentially adds different alloys and carries out alloyings, such as ferrosilicon, ferromanganese, ferrochrome, molybdenum-iron, ferro-niobium, Ferrotianium and metal copper plate etc., open Pyatyi vavuum pump, carry out vacuum cycle processing；
(4) handled and entered back into the refining of LF stoves, fed aluminum steel and titanium wire or Ti alloys before LF refining is outbound successively, adjusted AlSWith Ti composition, finally carries out B microalloying；
(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 alkalescence of cladding lid, Using special middle carbon abrasion resistant steel crystallizer protecting residue, degree of superheat control is at 28 DEG C, and casting process puts into M-EMS, Fan-shaped section is controlled in 1.2m/min, thickness of strand 220mm using dynamic Continuous Casting Soft Reduction technique, pulling speed of continuous casting；
(6) slab is cooled to room temperature, slab quality and surface is checked, take one layer of continuous casting billet surface epidermis off；
(7) feeding stove heat, the heat time 280min in heating furnace, 1270 DEG C of heating-up temperature, slab goes out furnace temp 1250 DEG C, rolled using two-stage control, rolled for recrystallization zone, rolling pass is reduced under equipment enabled condition, improved Residence time after rolling pass reduction ratio, and proper extension bundle, to increase the recrystallization quantity of deformed austenite, make even tissue Change；
(8) the laggard horizontal high voltage water dephosphorization of heating furnace, dephosphorization pressure 14MPa are gone out；
(9) 7 passage roughing are carried out after dephosphorization；
(10) roughing is complete treats that steel temperature drop, to 950 °C or so, carries out finish rolling, 3 percentage pass reductions are respectively before finish rolling again after dephosphorization 39.1%, 34.5%, 30.2%, last 1 percentage pass reduction is 6.8%, and milling train exit thickness is 10mm.900 DEG C of exit temperature at finishing；
(11) rolled piece goes out using ultra-fast cooling device quenching after milling train, and cooldown rate is 45 DEG C/s, and quenching final temperature is 350 DEG C；
(12) coiling machine is batched, and send holding pit to be incubated 8 hours；
(13) carry out opening flat in skin pass mill group, finishing is examined.
In the present embodiment, step（5）The middle chemical composition of strand and its content that obtained after conventional plate blank continuous casting are： C is 0.24wt%, and Si is 0.25wt%, and Mn is 1.55wt%, and Cu is 0.20wt%, and Mo is 0.30wt%, and Cr is 0.48wt%, and Nb is 0.035wt%, Ti are 0.018wt%, and B is 0.0009wt%, and P is 0.010wt%, and S is 0.002wt%, and remaining is Fe and can not kept 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 its performance expires Sufficient NM400 standard GB/Ts/T24186-2009 technical conditions.
Embodiment 3
A kind of ultrafast cold press quenching production Thin Specs abrasion-resistant stee NM400 method, including step：
(1) be 1295 DEG C by temperature, [S] be that 0.017% (S mass percent in molten iron) molten iron first carries out KR and takes off S, de- S terminates Processing of skimming is carried out afterwards, and molten iron light area is 95%, and molten iron terminal [S] is 0.0010% (S mass percent in molten iron), is adopted Use whole gon technics, finishing slag basicity 4.0；
(2) add pellet and iron scale makees cooling agent；Fluorite is added portionwise before steel addition 4.0kg per ton, blowing end point 2min forbids to add fluorite, and double slag-stopping tappings are carried out using slag retaining cone, floating plug, and slag thickness is 35mm, and converter tapping is entered with ferrosilicon Row component controlling；
(3) RH stoves are refined, to after RH, determine and record [O] (the O mass percent in steel) in steel with quick Determining oxygen probe Content, Steel ladle clearance 580mm, molten steel and top slag thickness 75mm, liquid steel temperature：1625 DEG C, first carry out RH and gently handle：Vacuum 495Pa, 20 minutes processing times, sequentially adds different alloys and carries out alloyings, such as ferrosilicon, ferromanganese, ferrochrome, molybdenum-iron, ferro-niobium, Ferrotianium and metal copper plate etc., open Pyatyi vavuum pump, carry out vacuum cycle processing；
(4) handled and entered back into the refining of LF stoves, fed aluminum steel and titanium wire or Ti alloys before LF refining is outbound successively, adjusted AlSWith Ti composition, finally carries out B microalloying；
(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 alkalescence of cladding lid, Using special middle carbon abrasion resistant steel crystallizer protecting residue, degree of superheat control is at 20 DEG C, and casting process puts into M-EMS, Fan-shaped section is controlled in 1.1m/min, thickness of strand 220mm using dynamic Continuous Casting Soft Reduction technique, pulling speed of continuous casting；
(6) slab is cooled to room temperature, slab quality and surface is checked, take one layer of continuous casting billet surface epidermis off；
(7) feeding stove heat, the heat time 280min in heating furnace, 1250 DEG C of heating-up temperature, slab goes out furnace temp 1220 DEG C, rolled using two-stage control, rolled for recrystallization zone, rolling pass is reduced under equipment enabled condition, improved Residence time after rolling pass reduction ratio, and proper extension bundle, to increase the recrystallization quantity of deformed austenite, make even tissue Change；
(8) the laggard horizontal high voltage water dephosphorization of heating furnace, dephosphorization pressure 14MPa are gone out；
(9) 9 passage roughing are carried out after dephosphorization；
(10) roughing is complete treats that steel temperature drop, to 920 °C or so, carries out finish rolling, 3 percentage pass reductions are respectively before finish rolling again after dephosphorization 31.1%, 28.5%, 27.2%, last 1 percentage pass reduction is 5.8%, and milling train exit thickness is 6mm, 920 DEG C of exit temperature at finishing；
(11) rolled piece goes out using ultra-fast cooling device quenching after milling train, and cooldown rate is 75 DEG C/s, and quenching final temperature is 400 DEG C；
(12) coiling machine is batched, and send holding pit to be incubated 6 hours；
(13) carry out opening flat in skin pass mill group, finishing is examined.
In the present embodiment, step（5）The middle chemical composition of strand and its content that obtained after conventional plate blank continuous casting are： The chemical composition and its content of strand be：C is 0.20wt%, and Si is 0.38wt%, and Mn is 1.70wt%, and Cu is 0.38wt%, and Mo is 0.38wt%, Cr are 0.40wt%, and Nb is 0.055wt%, and Ti is 0.028wt%, and B is 0.0012wt%, and P is 0.010wt%, and S is 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 its performance expires Sufficient NM400 standard GB/Ts/T24186-2009 technical conditions.
Embodiment 4
A kind of ultrafast cold press quenching production Thin Specs abrasion-resistant stee NM400 method, including step：
(1) it is 1295 DEG C by temperature, [S] is that 0.017% (S mass percent in molten iron) molten iron first carries out the de- S of KR, and de- S terminates Processing of skimming is carried out afterwards, and molten iron light area is 95%, and molten iron terminal [S] is 0.0010% (S mass percent in molten iron), is adopted Use whole gon technics, finishing slag basicity 4.0；
(2) add pellet and iron scale makees cooling agent；Steel addition 4.0kg per ton is added portionwise in fluorite, using slag retaining cone, Floating plug carries out double slag-stopping tappings, and slag thickness is 35mm, and converter tapping carries out component controlling with ferrosilicon
(3) RH stoves are refined, to after RH, determine and record [O] (the O mass percent in steel) in steel with quick Determining oxygen probe Content, Steel ladle clearance 580mm, molten steel and top slag thickness 75mm, liquid steel temperature：1625 DEG C, first carry out RH and gently handle：Vacuum 495Pa, 20 minutes processing times, sequentially adds different alloys and carries out alloyings, such as ferrosilicon, ferromanganese, ferrochrome, molybdenum-iron, ferro-niobium, Ferrotianium and metal copper plate etc., open Pyatyi vavuum pump, carry out vacuum cycle processing；
(4) handled and entered back into the refining of LF stoves, fed aluminum steel and titanium wire or Ti alloys before LF refining is outbound successively, adjusted AlSWith Ti composition, finally carries out B microalloying；
(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 alkalescence of cladding lid, Using special middle carbon abrasion resistant steel crystallizer protecting residue, degree of superheat control is at 20 DEG C, and casting process puts into M-EMS, Fan-shaped section is controlled in 1.1m/min, thickness of strand 220mm using dynamic Continuous Casting Soft Reduction technique, pulling speed of continuous casting；
(6) slab is cooled to room temperature, slab quality and surface is checked, take one layer of continuous casting billet surface epidermis off；
(7) feeding stove heat, the heat time 320min in heating furnace, 1250 DEG C of heating-up temperature, slab goes out furnace temp 1220 DEG C, rolled using two-stage control, rolled for recrystallization zone, rolling pass is reduced under equipment enabled condition, improved Residence time after rolling pass reduction ratio, and proper extension bundle, to increase the recrystallization quantity of deformed austenite, make even tissue Change；
(8) the laggard horizontal high voltage water dephosphorization of heating furnace, dephosphorization pressure 18MPa are gone out；
(9) 7 passage roughing are carried out after dephosphorization；
(10) roughing is complete treats that steel temperature drop, to 930 °C or so, carries out finish rolling, 3 percentage pass reductions are respectively before finish rolling again after dephosphorization 38.1%, 35.5%, 27.2%, last 1 percentage pass reduction is 7.8%, and milling train exit thickness is 8mm.910 DEG C of exit temperature at finishing；
(11) rolled piece goes out using ultra-fast cooling device quenching after milling train, and cooldown rate is 55 DEG C/s, and quenching final temperature is 350 DEG C；
(12) coiling machine is batched, and send holding pit to be incubated 8 hours；
(13) carry out opening flat in skin pass mill group, finishing is examined.
In the present embodiment, step（5）The middle chemical composition of strand and its content that obtained after conventional plate blank continuous casting are： The chemical composition and its content of strand be：C is 0.20wt%, and Si is 0.38wt%, and Mn is 1.70wt%, and Cu is 0.38wt%, and Mo is 0.38wt%, Cr are 0.40wt%, and Nb is 0.055wt%, and Ti is 0.028wt%, and B is 0.0012wt%, and P is 0.010wt%, and S is 0.001wt%, remaining is Fe and inevitable impurity.
After testing, 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 its performance expires Sufficient NM400 standard GB/Ts/T24186-2009 technical conditions.
The above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not to the present invention Embodiment restriction.For those of ordinary skill in the field, it can also make on the basis of the above description Other various forms of changes or variation.There is no necessity and possibility to exhaust all the enbodiments.It is all the present invention Any modifications, equivalent substitutions and improvements made within spirit and principle etc., should be included in the protection of the claims in the present invention Within the scope of.

Claims (4)

1. a kind of ultrafast cold press quenching production Thin Specs abrasion-resistant stee NM400 method, it is characterised in that including step：
(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 fully takes off Slag treatment, iron Water is skimmed to bright area >=90% of molten iron, reduces and S, molten iron terminal [S]≤0.0020% are returned in converter；
(2) converter smelting is carried out, whole process uses gon technics, and finishing slag basicity 3.0-4.0 makees cooling agent, pellet with pellet It must be added on request with iron scale；Fluorite should on a small quantity be added in batches according to slag situation in stove, steel addition≤4kg per ton, 2min forbids to add fluorite before steel≤5.5kg per ton, blowing end point during double slags, and carrying out double pushing off the slag using slag retaining cone, floating plug goes out Steel, slag thickness≤45mm, converter tapping carries out component controlling with ferrosilicon or silicomangan, and must not be entered using material containing Al Row deoxidation and alloying；
(3) RH stoves are refined, to after RH, determine and record [O] content in steel with quick Determining oxygen probe, and 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 carries out RH and gently handles：Very Reciprocal of duty cycle≤500Pa, processing time 15-20 minute, sequentially adds corresponding alloy and carries out alloying, open Pyatyi vavuum pump, enter The processing of row vacuum cycle；
(4) handled and entered back into the refining of LF stoves, fed aluminum steel and titanium wire or Ti alloys before LF refining is outbound successively, adjusted AlSWith Ti composition, finally carries out B microalloying；
(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 alkalescence of cladding lid, Using special middle carbon abrasion resistant steel crystallizer protecting residue, degree of superheat control is at 15 ~ 30 DEG C, and casting process input crystallizer electromagnetism is stirred Mix, in fan-shaped section using dynamic Continuous Casting Soft Reduction technique, 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) feeding stove heat, heat time >=240min in heating furnace, 1200 ~ 1280 DEG C of heating-up temperature, slab goes out heating furnace Temperature >=1150 DEG C, are rolled using two-stage control, are rolled for recrystallization zone, and rolling road is reduced under equipment enabled condition It is secondary, improve the residence time after rolling pass reduction ratio, and proper extension bundle；
(8) the laggard horizontal high voltage water dephosphorization of heating furnace, dephosphorization pressure >=12MPa are gone out；
(9) 5 ~ 9 passage roughing are carried out after dephosphorization；
(10) roughing is complete treats steel temperature drop to 900~950 °C or so, carries out the non-recrystallization zone rolling of austenite, it is ensured that non-recrystallization The total reduction in area is more than 45%, suitably increases 3 percentage pass reductions before reduction in pass, particularly finish rolling by rolling power and to the greatest extent may be used Can be larger, finishing temperature is controlled close to Ar3 phase transition temperatures as far as possible, final pass reduction ratio≤12%, to ensure thickness essence True and plate shape is good；
(11) rolled piece go out after milling train using ultra-fast cooling device quench, cooldown rate be 30 ~ 80 DEG C/s, quenching final temperature be 300 ~ 400℃；
(12) coiling machine is batched, and send holding pit to be incubated 6 ~ 10 hours；
(13) carry out opening flat in skin pass mill group, finishing is examined.
2. according to the method described in claim 1, it is characterised in that the casting obtained after conventional plate blank continuous casting is carried out in step (5) The chemical composition and its content of base be：The chemical composition and its content of strand be：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 is 0.03~0.06wt%, and Ti is 0.01~0.03wt%, and B is 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 characterised in that：In step (2), before the new blow-on of converter 8 stoves and it is big mend after preceding 3 Stove must not smelt identical steel grade.
4. according to the method described in claim 1, it is characterised in that：In step (10), milling train 6 ~ 12mm of exit thickness, finish rolling goes out 860~920 DEG C of temperature of mouth.
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110238210A (en) * 2019-06-28 2019-09-17 昆明理工大学 A method of removing hot rolling titanium plate titanium oxide surface skin
CN110643883A (en) * 2019-10-10 2020-01-03 南京钢铁股份有限公司 Production method of one-steel multi-stage wear-resistant steel blank
CN111349759A (en) * 2020-03-30 2020-06-30 武汉钢铁有限公司 Production method of thin-specification wear-resistant steel for DQ (data-on-demand) process
CN111979478A (en) * 2020-07-08 2020-11-24 邯郸钢铁集团有限责任公司 Thin SAPH440 strip steel and production method thereof
CN112501501A (en) * 2020-10-30 2021-03-16 包头钢铁（集团）有限责任公司 TMCP (thermal mechanical control processing) on-line quenching high-strength wear-resistant steel NM450 coiled plate and production method thereof
CN113201682A (en) * 2021-04-15 2021-08-03 华南理工大学 Bainite weathering steel and production method thereof
CN113234988A (en) * 2021-04-15 2021-08-10 华南理工大学 Method for producing weathering steel with yield strength of 700MPa grade by online quenching and product thereof
CN114058816A (en) * 2021-11-25 2022-02-18 张家港宏昌钢板有限公司 Alternative method for reducing heat treatment process of NM400
CN114130818A (en) * 2021-11-26 2022-03-04 山东钢铁集团日照有限公司 Manufacturing method for improving thin-specification production stability of hot-rolled wear-resistant steel BH550MC
CN115896621A (en) * 2022-11-18 2023-04-04 江阴兴澄特种钢铁有限公司 Thin-specification high-quality plate-shaped NM400 steel plate produced by adopting online quenching process and manufacturing method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103233171A (en) * 2013-05-10 2013-08-07 武汉钢铁(集团)公司 NM400-level anti-crack high-strength wear-resistant steel and production method thereof
CN105755373A (en) * 2016-04-01 2016-07-13 华南理工大学 Method for producing steel NM400
CN105861939A (en) * 2016-04-01 2016-08-17 华南理工大学 NM360 steel production method
CN106011627A (en) * 2016-07-05 2016-10-12 南阳汉冶特钢有限公司 Quenched and tempered high-strength alloy steel 06Ni9DR steel plate used for ultralow-temperature pressure container and preparation method of quenched and tempered high-strength alloy steel 06Ni9DR steel plate
CN106399839A (en) * 2016-09-18 2017-02-15 舞阳钢铁有限责任公司 Large-thickness, high-strength and high-tenacity NM400 steel plate and production method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103233171A (en) * 2013-05-10 2013-08-07 武汉钢铁(集团)公司 NM400-level anti-crack high-strength wear-resistant steel and production method thereof
CN105755373A (en) * 2016-04-01 2016-07-13 华南理工大学 Method for producing steel NM400
CN105861939A (en) * 2016-04-01 2016-08-17 华南理工大学 NM360 steel production method
CN106011627A (en) * 2016-07-05 2016-10-12 南阳汉冶特钢有限公司 Quenched and tempered high-strength alloy steel 06Ni9DR steel plate used for ultralow-temperature pressure container and preparation method of quenched and tempered high-strength alloy steel 06Ni9DR steel plate
CN106399839A (en) * 2016-09-18 2017-02-15 舞阳钢铁有限责任公司 Large-thickness, high-strength and high-tenacity NM400 steel plate and production method

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
俞海明: "《转炉钢水的炉外精炼技术》", 31 August 2011, 北京：冶金工业出版社 *
曹艺: "NM400级低合金高强度耐磨钢的开发及其组织性能研究", 《中国博士学位论文全文数据库 工程科技Ⅰ辑》 *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110238210A (en) * 2019-06-28 2019-09-17 昆明理工大学 A method of removing hot rolling titanium plate titanium oxide surface skin
CN110643883A (en) * 2019-10-10 2020-01-03 南京钢铁股份有限公司 Production method of one-steel multi-stage wear-resistant steel blank
CN111349759A (en) * 2020-03-30 2020-06-30 武汉钢铁有限公司 Production method of thin-specification wear-resistant steel for DQ (data-on-demand) process
CN111349759B (en) * 2020-03-30 2021-09-28 武汉钢铁有限公司 Production method of thin-specification wear-resistant steel for DQ (data-on-demand) process
CN111979478A (en) * 2020-07-08 2020-11-24 邯郸钢铁集团有限责任公司 Thin SAPH440 strip steel and production method thereof
CN112501501A (en) * 2020-10-30 2021-03-16 包头钢铁（集团）有限责任公司 TMCP (thermal mechanical control processing) on-line quenching high-strength wear-resistant steel NM450 coiled plate and production method thereof
CN113234988A (en) * 2021-04-15 2021-08-10 华南理工大学 Method for producing weathering steel with yield strength of 700MPa grade by online quenching and product thereof
CN113201682A (en) * 2021-04-15 2021-08-03 华南理工大学 Bainite weathering steel and production method thereof
CN113201682B (en) * 2021-04-15 2022-05-24 华南理工大学 Bainite weathering steel and production method thereof
CN114058816A (en) * 2021-11-25 2022-02-18 张家港宏昌钢板有限公司 Alternative method for reducing heat treatment process of NM400
CN114130818A (en) * 2021-11-26 2022-03-04 山东钢铁集团日照有限公司 Manufacturing method for improving thin-specification production stability of hot-rolled wear-resistant steel BH550MC
CN114130818B (en) * 2021-11-26 2023-11-10 山东钢铁集团日照有限公司 Manufacturing method for improving production stability of BH550MC thin gauge hot-rolled wear-resistant steel
CN115896621A (en) * 2022-11-18 2023-04-04 江阴兴澄特种钢铁有限公司 Thin-specification high-quality plate-shaped NM400 steel plate produced by adopting online quenching process and manufacturing method thereof

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