CN106987760A - A kind of high Ti abrasion-resistant stees NM400 of press quenching production Thin Specs method - Google Patents

A kind of high Ti abrasion-resistant stees NM400 of press quenching production Thin Specs method Download PDF

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CN106987760A
CN106987760A CN201710204530.1A CN201710204530A CN106987760A CN 106987760 A CN106987760 A CN 106987760A CN 201710204530 A CN201710204530 A CN 201710204530A CN 106987760 A CN106987760 A CN 106987760A
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steel
slag
molten steel
argon
temperature
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CN106987760B (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
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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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  • Metallurgy (AREA)
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Abstract

The invention discloses a kind of high Ti abrasion-resistant stees NM400 of press quenching production Thin Specs method, including step:Blast-melted, molten iron pretreatment, converter smelting, the refining of LF stoves, the refining of RH stoves, sheet blank continuous casting, heating furnace, water under high pressure dephosphorization, hot tandem, ultra-rapid cooling are quenched, batched, holding pit insulation, open flat, finishing, inspection.The present invention passes through rational Alloying Design, microalloying is carried out from micro Mo, Cr, Nb, Ti, B alloy, pass through ultra-rapid cooling quenching control microstructure after controlled rolling, give full play to the hydrodynamics effect of alloy, reduce alloy addition and precious alloy usage amount, simplify progress out-line quenching+tempering process after traditional abrasion-resistant stee hot rolling, shorten technological process, reduce alloy addition, the quenching degree for rolling steel plate after rear directly ultra-rapid cooling increases 1.4 ~ 1.5 times than tradition reheating quenching technical, the tough proportioning of steel is improved, production cost is reduced.

Description

A kind of high Ti abrasion-resistant stees NM400 of press quenching production Thin Specs method
Technical field
The invention belongs to wear-resisting steel plate manufacturing technology field.More particularly to a kind of high Ti of press quenching production Thin Specs is wear-resisting Steel NM400 method.
Background technology
Wearproof heat-resistant steel part is widely used in high temperature oxidation stability atmosphere and the operating mode of abrasive wear, the performance of these parts The normal operation of whole equipment is directly affected, material is not required nothing more than has high elevated temperature strength and certain wearability, also to have Good inoxidizability, could meet the requirement of its performance.Good and long lifespan the parts of performance, both can be significantly Reduce material consumption and reduce production cost, safety in production is ensured that with good economic benefit, improve equipment operating efficiency, Maintenance of equipment work amount is reduced simultaneously, labor intensity is reduced, and improves workman's working condition, with good social benefit.Its is wide It is general to be applied to：（1）Mining machinery：Various crusher components such as cover plate, wearing plate etc., vibratory sieve, mine car truck goods slot liner plate, material Struggle against liner, conveying Pot Lining etc..（2）Power industry：Fan blade, coal pulverizer part, cement output tank, air treatment system and transport Machine etc..（3）Cement industry：Mill liner, sheath, impact disc, pipeline, pump case crush machine part, powder classifier blade, various tanks Lining, various chassis, vibratory sieve etc..（4）Coal processing industry-Vertical Mill liner plate, feeding groove, hopper, broken machine part and liner plate, defeated coal Pipeline, pump housing etc..（5）It is other：Hopper, skip bucket etc. excessively of metallurgy industry, loading machine, scratch board conveyor of harbour machinery etc. are built Build excavator, bull-dozer bucket and knife plate, dump truck, asphalt mixer, hydraulic fill pipeline, sand washer, flotation device of industry etc.. Country's main manufacturer has Wugang, Wuhan Iron and Steel Plant, Baosteel, Nangang at present, all using heavy and medium plate mill or hot continuous rolling and is given birth to Production, Thin Specs production is difficult, and production cost is high, and plate shape is difficult to ensure that the production cycle is long, and delivery date is difficult to ensure that.Using thin plate Continuous-casting tandem-rolling line production Thin Specs abrasion-resistant stee can be shortened within 24 hours from smelting molten steel to the product export time, and is closed Golden cost is low, and Thin Specs plate shape is good, and properties of product are uniform and stable.
The content of the invention
It is an object of the present invention to provide a kind of high Ti abrasion-resistant stees NM400 of press quenching production Thin Specs method, it is set relatively to pass Hot rolling+out-line quenching of system+tempering abrasion-resistant stee production technology obtains more excellent finer and closely woven microcosmic group using lesser amount of alloy Knit, and with high anti-wear performance, welding performance and corrosion resistance, and it is wear-resisting to can manufacture the good Thin Specs of plate shape Steel, reduces production cost, shortens the delivery cycle.
To achieve the above object, the technical solution adopted by the present invention is：
A kind of high Ti abrasion-resistant stees NM400 of press quenching production Thin Specs method, including step:
(1) by temperature>1250 DEG C, the qualified molten iron of [S]≤0.020% first carry out processing of skimming, according to the temperature of supplied materials molten iron Degree, weight and the requirement of desulfurization final sulfur content, determine that the injection amount of passivated magnesium, injection carry out dry slag and the place that fully skims after terminating Reason, molten iron terminal [S]≤0.0020%；
(2) converter smelting is carried out, makees cooling agent with pellet, pellet and iron scale must be added by relevant regulations；Fluorite Should on a small quantity it be added in batches according to slag situation in stove, steel addition≤4kg per ton, during double slags before steel≤5.5kg per ton, blowing end point 2min forbids to add fluorite, and double slag-stopping tappings, slag thickness≤50mm, in converter tapping process are carried out using slag retaining cone, floating plug Deoxidation is carried out using substep deoxidization technique；
(3) molten steel feeding LF refining station, molten steel enters after refining station, and 1 is stirred with 300~800NL/min argon flow amounts to molten steel ~2min, so as to slugging；Graphite electrode is inserted in molten steel, power supply heating, while the Argon into molten steel, argon blowing rate is maintained at 100~400NL/min, 4~10min of Argon；Argon blowing rate is 100~450NL/min, 4~10min of Argon during molten steel desulfurizing Argon blowing rate is 100~400NL/min when thermometric, sampling；Argon 1.2~1.8MPa of pressure, during liquid steel refining, Xiang Gang Slag material slag making is added in water, desulfurizing and refining is carried out and goes to be mingled with processing, by dual alkalinity R (CaO/Si0 in slag2) control to exist 1.3~2.8 scopes, and make Fe0+Mn0 in slag<2.0%, outbound molten steel [S]≤0.008%；
(4) RH stoves are refined, to after RH, and ladle reaches pending position, measurement Steel ladle clearance height, slag thickness and temperature, Steel ladle clearance Control is in 300~700mm, and molten steel and top slag thickness should be less than 100mm, liquid steel temperature：1615℃-1630℃；According to Steel ladle clearance Height and the thick jacking ladle of slag, it is ensured that insertion tube insertion molten steel depth is not less than 600mm, according to temperature, oxygen content and steel sample into Divide and carry out alloying ingredients accurate adjustment, alloying order：First plus AL alloys；Then SiFe, MnFe, CrFe, MoFe, NbFe are added Circulated 3 minutes under final vacuum after being added Deng, alloy, thermometric, sampling, determine oxygen；[O] oxygen amount control is required in steel after alloying System is fed aluminum steel and titanium wire or Ti alloys at 1590-1600 DEG C, adjusted successively in below 3ppm, temperature control before RH refinings are outbound Whole AlS and Ti composition, finally carry out B microalloying；
(5) sheet blank continuous casting is carried out, to middle Baogang's water surface using double-deck coverture, lower floor adds enough alkaline covering agents, and Upper strata adds the acid coverture of low-carbon, and tundish is operated using constant weight；Molten steel is from big bag to tundish using long nozzle cast, argon gas Protection, using special middle carbon abrasion resistant steel crystallizer protecting residue, degree of superheat control is in 15 ~ 30 DEG C, casting process input crystallizer electricity Magnetic is stirred, and Continuous Casting Soft Reduction technique is used in fan-shaped section, and pulling speed of continuous casting is controlled in 3.0 ~ 3.5m/min, and thickness of strand 55 ~ The chemical composition and its content of the strand obtained after 70mm, sheet blank continuous casting be：C be 0.12~0.20wt%, Si be 0.2~ 0.4wt%, Mn be 1.2~1.8wt%, Mo be 0.15~0.30wt%, Cr be 0.20~0.50wt%, Nb be 0.03~ 0.06wt%, Ti are 0.1~0.15wt%, and B is 0.0006~0.0015wt%, P<0.015wt%, S<0.010wt%, remaining is Fe and inevitable impurity；
(6) stove heat is sent into, continuous casting billet enters furnace temp >=850 DEG C, and slab goes out furnace temp >=1000 DEG C；
(7) the laggard horizontal high voltage water dephosphorization of heating furnace, dephosphorization pressure >=16MPa are gone out；
(8) the frame mm finishing mill unit of hot continuous rolling 5 ~ 7, preceding 2 passage finish rolling reduction ratio >=50%, final pass reduction ratio are entered after dephosphorization ≤ 15%, 840 ~ 880 DEG C of exit temperature at finishing；
(9) rolled piece go out after milling train using ultra-fast cooling device quench, cooldown rate be 40 ~ 80 DEG C/s, quenching final temperature be 300 ~ 400℃；
(10) coiling machine is batched, and send holding pit to be incubated 6 ~ 10 hours；
(11) carry out opening flat in skin pass mill group, finishing is examined.
Further, in step (6), heat time >=60min in heating furnace, 1050 ~ 1150 DEG C of heating-up temperature.
Further, in step (8), 3.0 ~ 8.0mm of the milling train exit thickness, 860 ~ 920 DEG C of exit temperature at finishing.
Further, substep deoxidization technique includes described in step (2)：First add and be combined into ladle in converter tapping Deoxidier and metal aluminum blocks, to molten steel progress just deoxidation, the addition of double deoxidizer and metal aluminum blocks need to be according to molten steel terminal Targeted oxygen content is determined after dissolved oxygen and first deoxidation；Then low-carbon ferromanganese, ferrosilicon, molybdenum-iron and ferrochrome are added into ladle；To steel Molten steel carries out measurement liquid steel temperature after whole Argon, 3 ~ 8min of Argon, determine oxygen, samples in bag, according to Oxygen Content in Liquid Steel to molten steel In feed aluminum steel and carry out molten steel final deoxidizing and aluminium alloying, and keep 2~10min of Argon.
Further, the slag material described in step (3) includes lime, synthetic slag, pre- molten slag or slag adjusting agent.
The present invention carries out microalloying by rational Alloying Design from micro Mo, Cr, Nb, Ti, B alloy, leads to Ultra-rapid cooling quenching control microstructure after controlled rolling is crossed, the hydrodynamics effect of alloy is given full play to, reduces alloy The usage amount of addition and precious alloy, and progress out-line quenching+tempering process after traditional abrasion-resistant stee hot rolling is simplified, use The method reduces energy consumption compared with traditional handicraft, shortens technological process, reduces alloy addition, directly super after rolling The quenching degree of steel plate reheats quenching technical than tradition and increases 1.4 ~ 1.5 times after quick cooling, improves the tough proportioning of steel, Social resources are saved, production cost is reduced.
Embodiment
With reference to embodiment, the invention will be further described, not limiting the scope of the invention.
Embodiment 1
A kind of high Ti abrasion-resistant stees NM400 of press quenching production Thin Specs method, including step:
(1) by temperature>1250 DEG C, the qualified molten iron of [S]≤0.020% (S mass percent in molten iron) first carry out the place that skims Reason, is required according to the temperature of supplied materials molten iron, weight and desulfurization final sulfur content, after determining that the injection amount of passivated magnesium, injection terminate Carry out dry slag and fully take off Slag treatment, molten iron terminal [S] is 0.0020%；
(2) converter smelting is carried out, makees cooling agent with pellet, pellet and iron scale must be added by relevant regulations；Fluorite Should on a small quantity it be added in batches according to slag situation in stove, steel addition 3.8kg per ton, 2min forbids to add fluorite before blowing end point, adopts Double slag-stopping tappings are carried out with slag retaining cone, floating plug, slag thickness 48mm is taken off in converter tapping process using substep deoxidization technique Oxygen, the substep deoxidization technique includes：Double deoxidizer and metal aluminum blocks are first added into ladle in converter tapping, to molten steel Carry out just deoxidation；Then low-carbon ferromanganese, ferrosilicon, molybdenum-iron and ferrochrome are added into ladle；Whole Argon is carried out to molten steel in ladle, After Argon 8min measure liquid steel temperature, determine oxygen, sampling, according to Oxygen Content in Liquid Steel into molten steel feed aluminum steel progress molten steel final deoxidizing and Aluminium alloying, and keep Argon 10min；
(3) molten steel feeding LF refining station, molten steel enters after refining station, and 2min is stirred with 800NL/min argon flow amounts to molten steel, So as to slugging；Graphite electrode is inserted in molten steel, power supply heating, while the Argon into molten steel, argon blowing rate is maintained at 400NL/ Min, Argon 10min；Argon blowing rate is 450NL/min during molten steel desulfurizing, and argon blowing rate is when Argon 10min thermometrics, sampling 400NL/min；Argon pressure 1.2MPa, during liquid steel refining, slag material slag making, described slag material are added into molten steel Including lime, synthetic slag, pre- molten slag or slag adjusting agent, carry out desulfurizing and refining and go to be mingled with processing, by dual alkalinity R (CaO/ in slag Si02) control 2.5, and make Fe0+Mn0 in slag<2.0%, outbound molten steel [S] is 0.003%；
(4) RH stoves are refined, to after RH, and ladle reaches pending position, measurement Steel ladle clearance height, slag thickness and temperature, Steel ladle clearance Control is in 700mm, molten steel and top slag thickness 95mm, 1630 DEG C of liquid steel temperature；Insertion tube inserts molten steel depth 660mm, according to temperature Degree, oxygen content and steel sample ingredient carry out alloying ingredients accurate adjustment, alloying order：First plus AL alloys；Then add SiFe, MnFe, CrFe, MoFe, NbFe etc., alloy are circulated 3 minutes after adding under final vacuum, thermometric, sampling, determine oxygen；Alloying After require in steel [O] oxygen content control in 2ppm, temperature control fed successively at 1600 DEG C, before RH refinings are outbound aluminum steel and titanium wire or Ti alloys, adjust AlS and Ti composition, finally carry out B microalloying；
(5) sheet blank continuous casting is carried out, to middle Baogang's water surface using double-deck coverture, lower floor adds enough alkaline covering agents, and Upper strata adds the acid coverture of low-carbon, and tundish is operated using constant weight；Molten steel is from big bag to tundish using long nozzle cast, argon gas Protection, using special middle carbon abrasion resistant steel crystallizer protecting residue, degree of superheat control is at 30 DEG C, and casting process input crystallizer electromagnetism is stirred Mix, Continuous Casting Soft Reduction technique is used in fan-shaped section, pulling speed of continuous casting control connects in 3.0m/min, thickness of strand 70mm, sheet billet The chemical composition and its content of the strand obtained after casting be：C is 0.15wt%, and Si is 0.25wt%, and Mn is 1.25wt%, and Mo is 0.28wt%, Cr are 0.22wt%, and Nb is 0.031wt%, and Ti is 0.11wt%, and B is 0.0007wt%, and P is 0.010wt%, and S is 0.002wt%, remaining is Fe and inevitable impurity；
(6) stove heat is sent into, continuous casting billet enters furnace temp >=850 DEG C, the heat time 90min in heating furnace, heating temperature 1150 DEG C of degree, slab goes out furnace temp >=1000 DEG C；
(7) the laggard horizontal high voltage water dephosphorization of heating furnace, dephosphorization pressure 16MPa are gone out；
(8) the frame mm finishing mill unit of hot continuous rolling 7 is entered after dephosphorization, preceding 2 passage finish rolling reduction ratio is respectively 55.20%, 53.40%, most Percentage pass reduction is 11.3%, the milling train exit thickness 8.0mm, 860 DEG C of exit temperature at finishing afterwards；
(9) rolled piece goes out using ultra-fast cooling device quenching after milling train, and cooldown rate is 40 DEG C/s, and quenching final temperature is 300 DEG C；
(10) coiling machine is batched, and send holding pit to be incubated 6 hours；
(11) carry out opening flat in skin pass mill group, finishing is examined.
After testing, the high Ti press quenchings Thin Specs abrasion-resistant stee NM400 of the present embodiment production yield strength is 1045MPa, tensile strength 1265MPa, A50Elongation percentage 11.5%, surface Brinell hardness 401HBW, under the conditions of -20 DEG C, Charpy V-arrangement Ballistic work is respectively 62J, 55J, 52J, and its performance meets NM400 standard GB/Ts/T24186-2009 technical conditions.
Embodiment 2
A kind of high Ti abrasion-resistant stees NM400 of press quenching production Thin Specs method, including step:
(1) by temperature>1250 DEG C, the qualified molten iron of [S]≤0.020% (S mass percent in molten iron) first carry out the place that skims Reason, is required according to the temperature of supplied materials molten iron, weight and desulfurization final sulfur content, after determining that the injection amount of passivated magnesium, injection terminate Carry out dry slag and fully take off Slag treatment, molten iron terminal [S] is 0.0020%；
(2) converter smelting is carried out, makees cooling agent with pellet, pellet and iron scale must be added by relevant regulations；Fluorite Should on a small quantity it be added in batches according to slag situation in stove, steel addition 3.2kg per ton, 2min forbids to add fluorite before blowing end point, adopts Double slag-stopping tappings are carried out with slag retaining cone, floating plug, slag thickness 40mm is taken off in converter tapping process using substep deoxidization technique Oxygen, described substep deoxidization technique includes：Double deoxidizer and metal aluminum blocks are first added into ladle in converter tapping, to steel Water carries out just deoxidation；Then low-carbon ferromanganese, ferrosilicon, molybdenum-iron and ferrochrome are added into ladle；Whole process is carried out to molten steel in ladle to blow Liquid steel temperature is measured after argon, Argon 3min, oxygen, sampling is determined, hello aluminum steel progress molten steel is de- eventually into molten steel according to Oxygen Content in Liquid Steel Oxygen and aluminium alloying, and keep Argon 2min；
(3) molten steel feeding LF refining station, molten steel enters after refining station, and 2min is stirred with 300NL/min argon flow amounts to molten steel, So as to slugging；Graphite electrode is inserted in molten steel, power supply heating, while the Argon into molten steel, argon blowing rate is maintained at 100NL/ Min, Argon 4min；Argon blowing rate is 450NL/min during molten steel desulfurizing, and argon blowing rate is when Argon 4min thermometrics, sampling 100NL/min；Argon pressure 1.8MPa, during liquid steel refining, synthetic slag slag making is added into molten steel, desulfurizing and refining is carried out Go to be mingled with processing, by dual alkalinity R (CaO/Si0 in slag2) control 1.3, and make Fe0+Mn0 in slag<2.0%, outbound molten steel [S] is 0.003%；
(4) RH stoves are refined, to after RH, and ladle reaches pending position, measurement Steel ladle clearance height, slag thickness and temperature, Steel ladle clearance Control is in 300mm, molten steel and top slag thickness 80mm, liquid steel temperature：1615℃；Insertion tube insertion molten steel depth is not less than 620mm, Alloying ingredients accurate adjustment, alloying order are carried out according to temperature, oxygen content and steel sample ingredient：First plus AL alloys；Then add SiFe, MnFe, CrFe, MoFe, NbFe etc., alloy are circulated 3 minutes after adding under final vacuum, thermometric, sampling, determine oxygen； [O] oxygen content control is required in steel after alloying in 2ppm, and temperature control feeds aluminum steel and titanium successively at 1600 DEG C before RH refinings are outbound Line or Ti alloys, adjust AlS and Ti composition, finally carry out B microalloying；
(5) sheet blank continuous casting is carried out, to middle Baogang's water surface using double-deck coverture, lower floor adds enough alkaline covering agents, and Upper strata adds the acid coverture of low-carbon, and tundish is operated using constant weight；Molten steel is from big bag to tundish using long nozzle cast, argon gas Protection, using special middle carbon abrasion resistant steel crystallizer protecting residue, degree of superheat control is at 20 DEG C, and casting process input crystallizer electromagnetism is stirred Mix, Continuous Casting Soft Reduction technique is used in fan-shaped section, pulling speed of continuous casting control connects in 3.5m/min, thickness of strand 55mm, sheet billet The chemical composition and its content of the strand obtained after casting be：C is 0.13wt%, and Si is 0.38wt%, and Mn is 1.3wt%, and Mo is 0.16wt%, Cr are 0.25wt%, and Nb is 0.035wt%, and Ti is 0.15wt%, and B is 0.0010wt%, and P is 0.010wt%, and S is 0.002wt%, remaining is Fe and inevitable impurity；
(6) stove heat is sent into, continuous casting billet enters 920 DEG C of furnace temp, the heat time 96min in heating furnace, heating-up temperature 1150 DEG C, slab goes out 1150 DEG C of furnace temp；
(7) the laggard horizontal high voltage water dephosphorization of heating furnace, dephosphorization pressure 18MPa are gone out；
(8) the frame mm finishing mill unit of hot continuous rolling 7 is entered after dephosphorization, preceding 2 passage finish rolling reduction ratio is respectively 55.2%, 54.3%, finally Percentage pass reduction is 6.3%, milling train exit thickness 3.0mm, 880 DEG C of exit temperature at finishing；
(9) rolled piece goes out using ultra-fast cooling device quenching after milling train, and cooldown rate is 80 DEG C/s, and quenching final temperature is 400 DEG C；
(10) coiling machine is batched, and send holding pit to be incubated 10 hours；
(11) carry out opening flat in skin pass mill group, finishing is examined.
After testing, the high Ti press quenchings Thin Specs abrasion-resistant stee NM400 of the present embodiment production yield strength is 1155MPa, tensile strength 1285MPa, A50Elongation percentage 10.5%, surface Brinell hardness 410HBW, under the conditions of -20 DEG C, Charpy V-arrangement Ballistic work is respectively 55J, 60J, 58J, and its performance meets NM400 standard GB/Ts/T24186-2009 technical conditions.
Embodiment 3
A kind of high Ti abrasion-resistant stees NM400 of press quenching production Thin Specs method, including step:
(1) by temperature>1250 DEG C, the qualified molten iron of [S]≤0.020% (S mass percent in molten iron) first carry out the place that skims Reason, is required according to the temperature of supplied materials molten iron, weight and desulfurization final sulfur content, after determining that the injection amount of passivated magnesium, injection terminate Carry out dry slag and fully take off Slag treatment, molten iron terminal [S] is 0.0020% (S mass percent in molten iron)；
(2) converter smelting is carried out, makees cooling agent with pellet, pellet and iron scale must be added by relevant regulations；Fluorite Should on a small quantity it be added in batches according to slag situation in stove, steel addition 4kg per ton, 2min forbids to add fluorite before blowing end point, uses Slag retaining cone, floating plug carry out double slag-stopping tappings, and slag thickness 45mm is taken off in converter tapping process using substep deoxidization technique Oxygen, the substep deoxidization technique includes：Double deoxidizer and metal aluminum blocks are first added into ladle in converter tapping, to molten steel Carry out just deoxidation；Then low-carbon ferromanganese, ferrosilicon, molybdenum-iron and ferrochrome are added into ladle；Whole Argon is carried out to molten steel in ladle, After Argon 5min measure liquid steel temperature, determine oxygen, sampling, according to Oxygen Content in Liquid Steel into molten steel feed aluminum steel progress molten steel final deoxidizing and Aluminium alloying, and keep Argon 6min；
(3) molten steel feeding LF refining station, molten steel enters after refining station, and 2min is stirred with 500NL/min argon flow amounts to molten steel, So as to slugging；Graphite electrode is inserted in molten steel, power supply heating, while the Argon into molten steel, argon blowing rate is maintained at 200NL/ Min, Argon 5min；Argon blowing rate is 100NL/min during molten steel desulfurizing, and argon blowing rate is when Argon 5min thermometrics, sampling 200NL/min；Argon pressure 1.5MPa, during liquid steel refining, synthetic slag slag making is added into molten steel, desulfurizing and refining is carried out Go to be mingled with processing, by dual alkalinity R (CaO/Si0 in slag2) control 2.0, and make Fe0+Mn0 in slag<2.0%, outbound molten steel [S] is 0.003%；
(4) RH stoves are refined, to after RH, and ladle reaches pending position, measurement Steel ladle clearance height, slag thickness and temperature, Steel ladle clearance Control is in 500mm, molten steel and top slag thickness 80mm, liquid steel temperature：1615℃；Insertion tube insertion molten steel depth is 610mm, according to Temperature, oxygen content and steel sample ingredient carry out alloying ingredients accurate adjustment, alloying order：First plus AL alloys；Then add SiFe, MnFe, CrFe, MoFe, NbFe etc., alloy are circulated 3 minutes after adding under final vacuum, thermometric, sampling, determine oxygen；Alloying After require in steel [O] oxygen content control in 2ppm, temperature control fed successively at 1595 DEG C, before RH refinings are outbound aluminum steel and titanium wire or Ti alloys, adjust AlS and Ti composition, finally carry out B microalloying；
(5) sheet blank continuous casting is carried out, to middle Baogang's water surface using double-deck coverture, lower floor adds enough alkaline covering agents, and Upper strata adds the acid coverture of low-carbon, and tundish is operated using constant weight；Molten steel is from big bag to tundish using long nozzle cast, argon gas Protection, using special middle carbon abrasion resistant steel crystallizer protecting residue, degree of superheat control is at 30 DEG C, and casting process input crystallizer electromagnetism is stirred Mix, Continuous Casting Soft Reduction technique is used in fan-shaped section, pulling speed of continuous casting control connects in 3.5m/min, thickness of strand 60mm, sheet billet The chemical composition and its content of the strand obtained after casting be：C is 0.18wt%, and Si is 0.22wt%, and Mn is 1.75wt%, and Mo is 0.20wt%, Cr are 0.49wt%, and Nb is 0.05wt%, and Ti is 0.15wt%, and B is 0.0012wt%, and P is 0.010wt%, and S is 0.002wt%, remaining is Fe and inevitable impurity；
(6) stove heat is sent into, continuous casting billet enters 920 DEG C of furnace temp, the heat time 96min in heating furnace, heating-up temperature 1150 DEG C, slab goes out 1150 DEG C of furnace temp；
(7) the laggard horizontal high voltage water dephosphorization of heating furnace is gone out, dephosphorization pressure is 18MPa；
(8) the frame mm finishing mill unit of hot continuous rolling 5 is entered after dephosphorization, preceding 2 passage finish rolling reduction ratio is respectively 53.2%, 52.3%, finally Percentage pass reduction is 7.2%, milling train exit thickness 6.0mm, 840 DEG C of exit temperature at finishing；
(9) rolled piece goes out using ultra-fast cooling device quenching after milling train, and cooldown rate is 60 DEG C/s, and quenching final temperature is 350 DEG C；
(10) coiling machine is batched, and send holding pit to be incubated 8 hours；
(11) carry out opening flat in skin pass mill group, finishing is examined.
After testing, the high Ti press quenchings Thin Specs abrasion-resistant stee NM400 of the present embodiment production yield strength is 1095MPa, tensile strength 1205MPa, A50Elongation percentage 12.5%, surface Brinell hardness 403HBW, under the conditions of -20 DEG C, Charpy V-arrangement Ballistic work is respectively 76J, 72J, 65J, and its performance meets NM400 standard GB/Ts/T24186-2009 technical conditions.
Embodiment 4
A kind of high Ti abrasion-resistant stees NM400 of press quenching production Thin Specs method, including step:
(1) by temperature>1250 DEG C, the qualified molten iron of [S]≤0.020% (S mass percent in molten iron) first carry out the place that skims Reason, is required according to the temperature of supplied materials molten iron, weight and desulfurization final sulfur content, after determining that the injection amount of passivated magnesium, injection terminate Carry out dry slag and fully take off Slag treatment, molten iron terminal [S] is 0.0020% (S mass percent in molten iron)；
(2) converter smelting is carried out, makees cooling agent with pellet, pellet and iron scale must be added by relevant regulations；Fluorite Should on a small quantity it be added in batches according to slag situation in stove, steel addition 3kg per ton, 2min forbids to add fluorite before blowing end point, uses Slag retaining cone, floating plug carry out double slag-stopping tappings, and slag thickness 42mm is taken off in converter tapping process using substep deoxidization technique Oxygen, the substep deoxidization technique includes：Double deoxidizer and metal aluminum blocks are first added into ladle in converter tapping, to molten steel Carry out just deoxidation；Then low-carbon ferromanganese, ferrosilicon, molybdenum-iron and ferrochrome are added into ladle；Whole Argon is carried out to molten steel in ladle, After Argon 3min measure liquid steel temperature, determine oxygen, sampling, according to Oxygen Content in Liquid Steel into molten steel feed aluminum steel progress molten steel final deoxidizing and Aluminium alloying, and keep Argon 4min；
(3) molten steel feeding LF refining station, molten steel enters after refining station, and 2min is stirred with 800NL/min argon flow amounts to molten steel, So as to slugging；Graphite electrode is inserted in molten steel, power supply heating, while the Argon into molten steel, argon blowing rate is maintained at 400NL/ Min, Argon 10min；Argon blowing rate is 450NL/min during molten steel desulfurizing, and argon blowing rate is when Argon 10min thermometrics, sampling 400NL/min；Argon pressure 1.8MPa, during liquid steel refining, synthetic slag slag making is added into molten steel, desulfurizing and refining is carried out Go to be mingled with processing, by dual alkalinity R (CaO/Si0 in slag2) control 2.8, and make Fe0+Mn0 in slag<2.0%, outbound molten steel [S] is 0.002%；
(4) RH stoves are refined, to after RH, and ladle reaches pending position, measurement Steel ladle clearance height, slag thickness and temperature, Steel ladle clearance Control is in 300mm, molten steel and top slag thickness 90mm, liquid steel temperature：1625℃；Insertion tube inserts molten steel depth 650mm, according to temperature Degree, oxygen content and steel sample ingredient carry out alloying ingredients accurate adjustment, alloying order：First plus AL alloys；Then add SiFe, MnFe, CrFe, MoFe, NbFe etc., alloy are circulated 3 minutes after adding under final vacuum, thermometric, sampling, determine oxygen；Alloying After require in steel [O] oxygen content control in 2ppm, temperature control fed successively at 1590 DEG C, before RH refinings are outbound aluminum steel and titanium wire or Ti alloys, adjust AlS and Ti composition, finally carry out B microalloying；
(5) sheet blank continuous casting is carried out, to middle Baogang's water surface using double-deck coverture, lower floor adds enough alkaline covering agents, and Upper strata adds the acid coverture of low-carbon, and tundish is operated using constant weight；Molten steel is from big bag to tundish using long nozzle cast, argon gas Protection, using special middle carbon abrasion resistant steel crystallizer protecting residue, degree of superheat control is at 20 DEG C, and casting process input crystallizer electromagnetism is stirred Mix, Continuous Casting Soft Reduction technique is used in fan-shaped section, pulling speed of continuous casting control connects in 3.2m/min, thickness of strand 70mm, sheet billet The chemical composition and its content of the strand obtained after casting be：C is 0.15wt%, and Si is 0.25wt%, and Mn is 1.25wt%, and Mo is 0.28wt%, Cr are 0.45wt%, and Nb is 0.051wt%, and Ti is 0.10wt%, and B is 0.0007wt%, and P is 0.010wt%, and S is 0.002wt%, remaining is Fe and inevitable impurity；
(6) stove heat is sent into, continuous casting billet enters 920 DEG C of furnace temp, the heat time 120min in heating furnace, heating temperature 1150 DEG C of degree, slab goes out 1150 DEG C of furnace temp；
(7) the laggard horizontal high voltage water dephosphorization of heating furnace, dephosphorization pressure 18MPa are gone out；
(8) the frame mm finishing mill unit of hot continuous rolling 7 is entered after dephosphorization, preceding 2 passage finish rolling reduction ratio is respectively 53.2%, 52.8%, finally Percentage pass reduction is 8.5%, milling train exit thickness 4.0mm, 870 DEG C of exit temperature at finishing；
(9) rolled piece goes out using ultra-fast cooling device quenching after milling train, and cooldown rate is 80 DEG C/s, and quenching final temperature is 350 DEG C；
(10) coiling machine is batched, and send holding pit to be incubated 6 hours；
(11) carry out opening flat in skin pass mill group, finishing is examined.
After testing, the high Ti press quenchings Thin Specs abrasion-resistant stee NM400 of the present embodiment production yield strength is 1105MPa, tensile strength 1255MPa, A50Elongation percentage 11.5%, surface Brinell hardness 410HBW, under the conditions of -20 DEG C, Charpy V-arrangement Ballistic work is respectively 58J, 69J, 63J, and its performance meets 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 (5)

1. the high Ti abrasion-resistant stees NM400 of a kind of press quenching production Thin Specs method, it is characterised in that including step:
(1) by temperature>1250 DEG C, the qualified molten iron of [S]≤0.020% first carry out processing of skimming, according to the temperature of supplied materials molten iron Degree, weight and the requirement of desulfurization final sulfur content, determine that the injection amount of passivated magnesium, injection carry out dry slag and the place that fully skims after terminating Reason, molten iron terminal [S]≤0.0020%；
(2) converter smelting is carried out, makees cooling agent with pellet, pellet and iron scale must be added by relevant regulations；Fluorite Should on a small quantity it be added in batches according to slag situation in stove, steel addition≤4kg per ton, during double slags before steel≤5.5kg per ton, blowing end point 2min forbids to add fluorite, and double slag-stopping tappings, slag thickness≤50mm, in converter tapping process are carried out using slag retaining cone, floating plug Deoxidation is carried out using substep deoxidization technique；
(3) molten steel feeding LF refining station, molten steel enters after refining station, and 1 is stirred with 300~800NL/min argon flow amounts to molten steel ~2min, so as to slugging；Graphite electrode is inserted in molten steel, power supply heating, while the Argon into molten steel, argon blowing rate is maintained at 100~400NL/min, 4~10min of Argon；Argon blowing rate is 100~450NL/min, 4~10min of Argon during molten steel desulfurizing Argon blowing rate is 100~400NL/min when thermometric, sampling;Argon 1.2~1.8MPa of pressure, during liquid steel refining, Xiang Gang Slag material slag making is added in water, desulfurizing and refining is carried out and goes to be mingled with processing, by dual alkalinity R (CaO/Si0 in slag2) control to exist 1.3~2.8 scopes, and make Fe0+Mn0 in slag<2.0%, outbound molten steel [S]≤0.008%；
(4) RH stoves are refined, to after RH, and ladle reaches pending position, measurement Steel ladle clearance height, slag thickness and temperature, Steel ladle clearance Control is in 300~700mm, and molten steel and top slag thickness should be less than 100mm, liquid steel temperature：1615℃-1630℃；According to Steel ladle clearance Height and the thick jacking ladle of slag, it is ensured that insertion tube insertion molten steel depth is not less than 600mm, according to temperature, oxygen content and steel sample into Divide and carry out alloying ingredients accurate adjustment, alloying order：First plus AL alloys；Then SiFe, MnFe, CrFe, MoFe, NbFe are added, Alloy is circulated 3 minutes after adding under final vacuum, thermometric, sampling, determines oxygen；[O] oxygen content control is required in steel after alloying In below 3ppm, temperature control feeds aluminum steel and titanium wire or Ti alloys, adjustment successively at 1590-1600 DEG C before RH refinings are outbound AlS and Ti composition, finally carries out B microalloying；
(5) sheet blank continuous casting is carried out, to middle Baogang's water surface using double-deck coverture, lower floor adds enough alkaline covering agents, and Upper strata adds the acid coverture of low-carbon, and tundish is operated using constant weight；Molten steel is from big bag to tundish using long nozzle cast, argon gas Protection, using special middle carbon abrasion resistant steel crystallizer protecting residue, degree of superheat control is in 15 ~ 30 DEG C, casting process input crystallizer electricity Magnetic is stirred, and Continuous Casting Soft Reduction technique is used in fan-shaped section, and pulling speed of continuous casting is controlled in 3.0 ~ 3.5m/min, and thickness of strand 55 ~ The chemical composition and its content of the strand obtained after 70mm, sheet blank continuous casting be：C be 0.12~0.20wt%, Si be 0.2~ 0.4wt%, Mn be 1.2~1.8wt%, Mo be 0.15~0.30wt%, Cr be 0.20~0.50wt%, Nb be 0.03~ 0.06wt%, Ti are 0.1~0.15wt%, and B is 0.0006~0.0015wt%, P<0.015wt%, S<0.010wt%, remaining is Fe and inevitable impurity；
(6) stove heat is sent into, continuous casting billet enters furnace temp >=850 DEG C, and slab goes out furnace temp >=1000 DEG C；
(7) the laggard horizontal high voltage water dephosphorization of heating furnace, dephosphorization pressure >=16MPa are gone out；
(8) the frame mm finishing mill unit of hot continuous rolling 5 ~ 7, preceding 2 passage finish rolling reduction ratio >=50%, final pass reduction ratio are entered after dephosphorization ≤ 15%, 840 ~ 880 DEG C of exit temperature at finishing；
(9) rolled piece go out after milling train using ultra-fast cooling device quench, cooldown rate be 40 ~ 80 DEG C/s, quenching final temperature be 300 ~ 400℃；
(10) coiling machine is batched, and send holding pit to be incubated 6 ~ 10 hours；
(11) carry out opening flat in skin pass mill group, finishing is examined.
2. the high Ti abrasion-resistant stees NM400 of press quenching production Thin Specs according to claim 1 method, it is characterised in that： In step (6), heat time >=60min in heating furnace, 1050 ~ 1150 DEG C of heating-up temperature.
3. the high Ti abrasion-resistant stees NM400 of press quenching production Thin Specs according to claim 1 method, it is characterised in that： In step (8), 3.0 ~ 8.0mm of the milling train exit thickness, 860 ~ 920 DEG C of exit temperature at finishing.
4. the high Ti abrasion-resistant stees NM400 of press quenching production Thin Specs according to claim 1 method, it is characterised in that： Substep deoxidization technique includes described in step (2)：Double deoxidizer and metal aluminum blocks are first added into ladle in converter tapping, To molten steel progress just deoxidation, the addition of double deoxidizer and metal aluminum blocks need to be according to mesh after molten steel terminal dissolved oxygen and first deoxidation Oxygen content is marked to determine；Then low-carbon ferromanganese, ferrosilicon, molybdenum-iron and ferrochrome are added into ladle；Whole process is carried out to molten steel in ladle to blow Liquid steel temperature is measured after argon, 3 ~ 8min of Argon, oxygen, sampling is determined, feeding aluminum steel into molten steel according to Oxygen Content in Liquid Steel carries out molten steel end Deoxidation and aluminium alloying, and keep 2~10min of Argon.
5. the high Ti abrasion-resistant stees NM400 of press quenching production Thin Specs according to claim 1 method, it is characterised in that： Slag material described in step (3) includes lime, synthetic slag, pre- molten slag or slag adjusting agent.
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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
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CN114350894A (en) * 2022-01-07 2022-04-15 鞍钢股份有限公司 Precise titanium adjusting method for refining treatment of high-titanium wear-resistant steel in single LF furnace
CN114350894B (en) * 2022-01-07 2023-01-17 鞍钢股份有限公司 Precise titanium adjusting method for refining treatment of high-titanium wear-resistant steel in single LF furnace

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