CN106906411A - A kind of public steel structure earthquake-resistant hot rolled angle steel of Q345FRD fire resistings for building and preparation method thereof - Google Patents

A kind of public steel structure earthquake-resistant hot rolled angle steel of Q345FRD fire resistings for building and preparation method thereof Download PDF

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CN106906411A
CN106906411A CN201710187058.5A CN201710187058A CN106906411A CN 106906411 A CN106906411 A CN 106906411A CN 201710187058 A CN201710187058 A CN 201710187058A CN 106906411 A CN106906411 A CN 106906411A
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steel
molten
remaining
amount
building
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CN106906411B (en
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邓家木
陈伟
张卫强
周宇含
汪涛
张志波
文玉兵
王文锋
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Wuhan Iron and Steel Group Kunming Iron and Steel Co Ltd
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Wuhan Iron and Steel Group Kunming Iron and Steel Co Ltd
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    • 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
    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
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    • C21C1/025—Agents used for dephosphorising or 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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/35—Blowing from above and through the bath
    • 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
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • 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
    • C21C7/072—Treatment with gases
    • 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
    • C21C7/076—Use of slags or fluxes as treating agents
    • 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
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C22/00—Alloys based on manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
    • C22C27/02—Alloys based on vanadium, niobium, or tantalum
    • C22C27/025—Alloys based on vanadium, niobium, or tantalum alloys based on vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
    • C22C27/04—Alloys based on tungsten or molybdenum
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/10—Cast-iron alloys containing aluminium or 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract

The invention discloses a kind of public steel structure earthquake-resistant hot rolled angle steel of Q345FRD fire resistings for building and preparation method thereof, the preparation method of the earthquake-resistant hot rolled angle steel of described fire resisting is comprised the following steps：A, molten iron pretreatment desulfurizing；B, smelting molten steel；C, deoxidation alloying；D, the refining of molten steel LF stoves；E, molten steel casting；F, heating steel billet；G, steel billet high-pressure water tank de-scaling；H, big mill are preforming；I, universal mill tandem rolling；The online appearance and size detection of J, angle steel；K, finishing.The present invention is by Alternative integrated innovation, microalloy element precipitation strength and refined crystalline strengthening mechanism are given full play to, produce that poker dimensional accuracy is high, stable mechanical property, 345MPa grades of No. 14 No. 18 hot-rolled angle steels with excellent fire resisting shock resistance and low-temperature impact toughness, meet public steel building（Such as automobile yard, train waiting hall, motor-car platform）Fire resisting antidetonation use requirement.

Description

A kind of public steel structure earthquake-resistant hot rolled angle steel of Q345FRD fire resistings for building and its preparation Method
Technical field
The invention belongs to metal material and ferrous metal pressure processing technology field, and in particular to a kind of public steel builds to be built With earthquake-resistant hot rolled angle steel of Q345FRD fire resistings and preparation method thereof, further, it is related to a kind of for public steel building（Such as vapour Station, train Waiting Lounge, motor-car platform）With No. 14-No. 18 hot-rolled angle steels of fire resisting Q345FRD and preparation method thereof.
Background technology
Current China infrastructure is still relatively backward, and capital construction will be the field of state key investment construction.With intercity The propulsion that motor-car, expressway construction, comprehensive passenger transport hub, coastal port harbour, urban transit bus yard are built, matches somebody with somebody therewith The public steel of set builds and builds（Such as waiting hall, yard）In a large amount of newly-built or reorganization and expansion.In view of communal facility construction timber and disappearing The strict and lifting of anti-standard, in the urgent need to the high-quality steel new material for developing supporting is adapted therewith.Public steel construction is built Build generally using hot rolled H-shaped, big-and-middle-sized hot-rolled angle steel etc., country is existing at present《Fire resisting is hot rolled H-shaped》Standard, but without fire resisting With other section bars of feature（Angle steel, channel-section steel）Standards and norms, a roof structure of an essay is arranged and uses Q235, Q345 hot-rolled angle steel mostly. The production technology equipment of the medium-sized hot-rolled angle steel of current No. 14 and the above differs, mostly using the open-train mill of low cost or half Continuous rolling process bar and shape mill is produced, and product poker size and Mechanical Fluctuation be larger, is unfavorable for next procedure punching, at anti-corrosion Reason and Fast Installation.
, generally using hot rolled H-shaped, big-and-middle-sized hot-rolled angle steel etc., country is existing at present for public steel building《It is resistance to burning hot Roll H profile steel》Standard, but other section bars without fire resisting feature（Angle steel, channel-section steel）Standards and norms, a roof structure of an essay is arranged and adopted mostly With Q235, Q345 hot-rolled angle steel.The production technology equipment of the medium-sized hot-rolled angle steel of current No. 14 and the above differs, mostly using low Open-train mill or semi-tandem rolling technique the bar and shape mill production of cost, product poker size and Mechanical Fluctuation are larger, unfavorable In next procedure punching, preservative treatment and Fast Installation.
It is main in domestic prior art at present to be produced using bar mill or small sectionproduction line, and product is small-size angle iron （Less than No. 10）, it is mainly used in steel tower and manufactures, product does not have fire resistance.Yet there are no the document of the earthquake-resistant hot rolled angle steel of fire resisting And relevant report.
The content of the invention
The first object of the present invention is to provide a kind of public steel structure earthquake-resistant hot rolled angle steel of Q345FRD fire resistings for building, this Second purpose of invention is to provide a kind of preparation method of the public steel structure earthquake-resistant hot rolled angle steel of Q345FRD fire resistings for building.
The first object of the present invention is achieved in that described fire resisting hot-rolled angle steel is pre-processed by molten iron by molten iron Desulfurization, smelting molten steel, deoxidation alloying, the refining of molten steel LF stoves, molten steel casting, heating steel billet, the de-scaling of steel billet high-pressure water tank, cogging Milling train is preforming, the online appearance and size detection of universal mill tandem rolling, angle steel, finishing are prepared, with following weight percent The chemical composition of ratio：C 0.16~0.21 wt%, Si 0.23~0.33 wt%, Mn 0.85~1.05 wt%, V 0.017~ 0.015~0.030wt% of 0.032wt%, Ti, 0.080~0.100wt% of Mo, S≤0.015wt%, P≤0.020 wt%, remaining It is Fe and inevitable impurity.
The second object of the present invention is achieved in that and comprises the following steps：
A, molten iron pretreatment desulfurizing：The blast-melted KR methods molten iron preprocessing unit that is transported to is carried out into desulfurization process, stirring-head insertion Severity control is 2500 ~ 2800mm, by the amount of 10.0~12.0 kg/t steel, adds CaO matter desulfurizing agent to carry out desulfurization process, is stirred Time control is mixed for 6 minutes；Stirring terminate after carry out taking off rear slag operation, it is ensured that in ladle molten iron face it is exposed >=3/4, scratch clean desulfurization Slag, obtains pretreated molten iron；
B, smelting molten steel：By in the pretreated molten iron of step A, high-quality steel scrap and the pig iron 120 tons of LD converters of addition, top bottom is carried out Top-bottom blowing, respectively by 30.0~33.0kg/t steel, 22.0~26.0kg/t steel, 2.0~4.0kg/t steel addition, add Lime, light dolomite, magnesite ball slag making, control endpoint carbon content >=0.08wt%, tapping temperature≤1650 DEG C；Tapping before to Ladle bottom adds lime and refining slag carries out wash heat, and lime adding amount is 2.0kg/t steel, and refining slag addition is 1.0kg/t Steel；Using whole bottom argon blowing technology during tapping, argon flow amount is controlled to 20~40NL/min；
C, deoxidation alloying：Step B is smelted the molten steel tapping for finishing, when the molten steel amount in ladle is more than 1/4, by following de- Oxygen alloyization is sequentially：Ferro-aluminum → Si-Ca-Ba → silicomangan → molybdenum-iron → VN alloy, successively to adding following alloy in ladle： By the amount of 0.8~1.5kg/t steel, ferro-aluminum is added；By the amount of 1.0kg/t steel, Si-Ca-Ba is added；By 11.5~15.7kg/t steel Amount, adds silicomangan；By the amount of 1.4~1.7kg/t steel, molybdenum-iron is added；By the amount of 0.18~0.38 kg/t steel, vanadium is added Nitrogen alloy；Above-mentioned alloy is added when ladle molten steel amount reaches 3/4；After tapping is finished, molten steel is hung and delivers to LF stove refining procedures；
D, the refining of molten steel LF stoves：Step C tapping is finished into molten steel it is hung to LF stoves refining station and connect argon gas band, opens argon gas and use 15~25NL/min Argons 2 minutes, then bottom electrode is using 7~9 grades of sluggings of gear；After being powered 3 minutes, in lift electrode observation stove Slugging situation, afterwards thermometric determine oxygen and sampling；Aluminum shot 0.5~0.8kg/t steel is added, molten steel oxygen activity≤10ppm is controlled, afterwards By the amount of 0.7~1.3kg/t steel, the ferrotianium of following mass ratio is added：Ti 32.5wt%, remaining be Fe and inevitably it is impure Thing；At the same time, residue adjustment is carried out according to slag condition, if slag condition is diluter, adds lime 4.0~6.0kg/t steel, add calcium carbide 1.0 Kg/t steel residue adjustments, it is 5.0~6.0 to control basicity of slag；Carried out at line feeding after liquid steel temperature is heated into 1570~1580 DEG C afterwards Reason, silicon-calcium wire of the feeding with following mass ratio：Si 53.5wt%, Ca 28.2wt%, remaining be Fe and inevitably it is impure Thing, wire-feeding velocity is 3.0m/s, and line feeding amount is 100m；It is the small argon gas amount of 15~25NL/min to steel that line feeding terminates to use flow Water carries out soft blow argon, and soft blow time >=6 minute add molten steel covering agent afterwards, and addition is controlled to 1.0 kg/t steel, then will Molten steel is hung to casting station；
E, molten steel casting：It it is 1560~1570 DEG C in tundish temperature, pulling rate is 1.2~1.4m/min, and Water Rate for Secondary Cooling Water is 0.5 ~0.6L/kg, M-EMS Current intensity be 350A, running frequency be 2.5HZ under conditions of, using the straight arcs of R12m The molten steel whole process protection of D steps is cast into the stream bloom casting machine of 5 machine of continuous straightening 5 steel billet of section 200mm × 200mm；
F, heating steel billet：The steel billet of E steps is added through rollgang feeding side inlet side outlet walking beam double-regenerative heating furnace Heat, blast furnace gas and air preheating temperature are all higher than 1000 DEG C, and burner hearth is adopted as micro-pressure operation, and pressure is 10 ~ 15Pa；Heating Stove soaking zone temperature control is 1170 ~ 1200 DEG C, and the heat time is 80 ~ 100 minutes, and steel billet temperature is controlled to 1120 ~ 1150 DEG C；
G, steel billet high-pressure water tank de-scaling：F-step steel billet is delivered to the water under high pressure that length is 1.2m from after heating furnace tapping through roller-way Case removes removing iron scale, and the steel billet speed of service is controlled to 1.0m/s, and nozzle hydraulic pressure is 16-18MPa；After high-pressure water descaling, steel Base temperature is down to 1020 ~ 1050 DEG C；
H, big mill are preforming：G steps steel billet feeding two-roller reversible big mill is preforming, and start rolling temperature is controlled to 1020 ~ 1050 DEG C, mill speed is controlled to 3.8 ~ 4.0m/s, and rolling pass is 7 roads, and pass schedule uses the pre- knifing pass system of butterfly, Obtain preforming rolled piece；
I, universal mill tandem rolling：The preforming rolled piece of H steps is sent into 10 frame universal mill tandem rollings, rolled piece enters Continuous mill train Temperature control is 920 ~ 950 DEG C, and total rolling pass is 10 roads, and per the road of frame 1, universal mill is adjusted to two roller die formulas, rolling speed Degree is controlled to 4.5 ~ 4.8m/s；Finishing temperature control be 860 ~ 890 DEG C, finished frame outlet rolling speed control be 4.5 ~ 4.8m/s；
The online appearance and size detection of J, angle steel：The rolled piece that I steps are obtained delivers to Zaser contourgraph and carries out profile chi through runout table Very little accuracy detection, after after online shaping blades flying shear upper cold bed；
K, finishing：J step process finish after angle steel through the roller-way upper cold bed of conveying, rolled piece naturally cooled on cold bed 80 DEG C with Under；On-line straightening afterwards, aligning speed control is 4.6 ~ 4.9m/s；After angle steel is through aligning, carry out scale sawing, collection, stacking, Automatic bundling, mark, obtain final product.
Beneficial effects of the present invention：
1st, the present invention pre-processed by molten iron, the refining of converter smelting, deoxidation alloying, LF stoves, bloom whole process protection continuous casting, Bloom heating, preforming steel billet cogging, tandem rolling controlled rolling, finishing etc. carry out Alternative integrated innovation, have given full play to micro- Alloying element precipitation strength and refined crystalline strengthening mechanism, produce that poker dimensional accuracy is high, stable mechanical property, with excellent fire resisting 345MPa grades of No. 14-No. 18 hot-rolled angle steels of shock resistance and low-temperature impact toughness, the hot-rolled angle steel performance inconsistency for being produced is small, tool There is good fire resisting shock resistance and excellent low-temperature impact toughness, meet public steel building（As automobile yard, train are waited Car hall, motor-car platform）Fire resisting antidetonation use requirement.
2nd, steel making working procedure of the invention uses combined microalloying technique, adds VN alloy, ferrotianium, molybdenum-iron etc. micro- in steel Alloy strengthening element, steel rolling process controls relatively low finishing temperature and mill speed, promotes the microalloy carbon of small and dispersed The formation and precipitation of the second phase of (nitrogen) compound, plasticity and toughness are significantly improved while improving hardness of steel；Steel rolling process uses section The generous blank of 200mm × 200mm, is controlled rolling, the angle for being produced by preforming+10 frame universal mill of two roller coggings Steel dimensions high precision, mechanical performance stabilization, the lower yield strength R under 600 DEG C of high temperaturep0.2>=280MPa, 600 DEG C of surrenders are strong Degree and normal temperature condition yield strength ratio >=0.75, strong flexor ratio Rm/ReL >=1.35, -20 DEG C of Impact energy Ak v >=70J, steel tool There is excellent fire resisting shock resistance and low-temperature impact toughness, meet public steel and build the fire resistant requirements built to steel.
Specific embodiment
With reference to embodiment, the present invention is further illustrated, but the present invention is any limitation as never in any form, Based on present invention teach that any conversion or replacement made, belong to protection scope of the present invention.
Public steel structure fire resisting hot-rolled angle steel for building of the present invention, is by molten iron pretreatment desulfurizing, steel by molten iron Hydrometallurgy refining, deoxidation alloying, the refining of molten steel LF stoves, molten steel casting, heating steel billet, the de-scaling of steel billet high-pressure water tank, big mill are pre- Shaping, universal mill tandem rolling, the online appearance and size detection of angle steel, finishing are prepared, the change with following weight percents Study point：C 0.16~0.21 wt%, Si 0.23~0.33 wt%, Mn 0.85~1.05 wt%, V 0.017~ 0.015~0.030wt% of 0.032wt%, Ti, 0.080~0.100wt% of Mo, S≤0.015wt%, P≤0.020 wt%, remaining It is Fe and inevitable impurity.
The specification of described public steel structure fire resisting hot-rolled angle steel for building（Length of side mm × length of side mm × side thickness mm) be：140 ×140×(12-16)mm、160×160×(12-16)mm、180×180×(12-16)mm。
The preparation method of public steel structure fire resisting hot-rolled angle steel for building of the present invention, comprises the following steps：
A, molten iron pretreatment desulfurizing：The blast-melted KR methods molten iron preprocessing unit that is transported to is carried out into desulfurization process, stirring-head insertion Severity control is 2500 ~ 2800mm, by the amount of 10.0~12.0 kg/t steel, adds CaO matter desulfurizing agent to carry out desulfurization process, is stirred Time control is mixed for 6 minutes；Stirring terminate after carry out taking off rear slag operation, it is ensured that in ladle molten iron face it is exposed >=3/4, scratch clean desulfurization Slag, obtains pretreated molten iron；
B, smelting molten steel：By in the pretreated molten iron of step A, high-quality steel scrap and the pig iron 120 tons of LD converters of addition, top bottom is carried out Top-bottom blowing, respectively by 30.0~33.0kg/t steel, 22.0~26.0kg/t steel, 2.0~4.0kg/t steel addition, add Lime, light dolomite, magnesite ball slag making, control endpoint carbon content >=0.08wt%, tapping temperature≤1650 DEG C；Tapping before to Ladle bottom adds lime and refining slag carries out wash heat, and lime adding amount is 2.0kg/t steel, and refining slag addition is 1.0kg/t Steel；Using whole bottom argon blowing technology during tapping, argon flow amount is controlled to 20~40NL/min；
C, deoxidation alloying：Step B is smelted the molten steel tapping for finishing, when the molten steel amount in ladle is more than 1/4, by following de- Oxygen alloyization is sequentially：Ferro-aluminum → Si-Ca-Ba → silicomangan → molybdenum-iron → VN alloy, successively to adding following alloy in ladle： By the amount of 0.8~1.5kg/t steel, ferro-aluminum is added；By the amount of 1.0kg/t steel, Si-Ca-Ba is added；By 11.5~15.7kg/t steel Amount, adds silicomangan；By the amount of 1.4~1.7kg/t steel, molybdenum-iron is added；By the amount of 0.18~0.38 kg/t steel, vanadium is added Nitrogen alloy；Above-mentioned alloy is added when ladle molten steel amount reaches 3/4；After tapping is finished, molten steel is hung and delivers to LF stove refining procedures；
D, the refining of molten steel LF stoves：Step C tapping is finished into molten steel it is hung to LF stoves refining station and connect argon gas band, opens argon gas and use 15~25NL/min Argons 2 minutes, then bottom electrode is using 7~9 grades of sluggings of gear；After being powered 3 minutes, in lift electrode observation stove Slugging situation, afterwards thermometric determine oxygen and sampling；Aluminum shot 0.5~0.8kg/t steel is added, molten steel oxygen activity≤10ppm is controlled, afterwards By the amount of 0.7~1.3kg/t steel, the ferrotianium of following mass ratio is added：Ti 32.5wt%, remaining be Fe and inevitably it is impure Thing；At the same time, residue adjustment is carried out according to slag condition, if slag condition is diluter, adds lime 4.0~6.0kg/t steel, add calcium carbide 1.0 Kg/t steel residue adjustments, it is 5.0~6.0 to control basicity of slag；Carried out at line feeding after liquid steel temperature is heated into 1570~1580 DEG C afterwards Reason, silicon-calcium wire of the feeding with following mass ratio：Si 53.5wt%, Ca 28.2wt%, remaining be Fe and inevitably it is impure Thing, wire-feeding velocity is 3.0m/s, and line feeding amount is 100m；It is the small argon gas amount of 15~25NL/min to steel that line feeding terminates to use flow Water carries out soft blow argon, and soft blow time >=6 minute add molten steel covering agent afterwards, and addition is controlled to 1.0 kg/t steel, then will Molten steel is hung to casting station；
E, molten steel casting：It it is 1560~1570 DEG C in tundish temperature, pulling rate is 1.2~1.4m/min, and Water Rate for Secondary Cooling Water is 0.5 ~0.6L/kg, M-EMS Current intensity be 350A, running frequency be 2.5HZ under conditions of, using the straight arcs of R12m The molten steel whole process protection of D steps is cast into the stream bloom casting machine of 5 machine of continuous straightening 5 steel billet of section 200mm × 200mm；
F, heating steel billet：The steel billet of E steps is added through rollgang feeding side inlet side outlet walking beam double-regenerative heating furnace Heat, blast furnace gas and air preheating temperature are all higher than 1000 DEG C, and burner hearth is adopted as micro-pressure operation, and pressure is 10 ~ 15Pa；Heating Stove soaking zone temperature control is 1170 ~ 1200 DEG C, and the heat time is 80 ~ 100 minutes, and steel billet temperature is controlled to 1120 ~ 1150 DEG C；
G, steel billet high-pressure water tank de-scaling：F-step steel billet is delivered to the water under high pressure that length is 1.2m from after heating furnace tapping through roller-way Case removes removing iron scale, and the steel billet speed of service is controlled to 1.0m/s, and nozzle hydraulic pressure is 16 ~ 18MPa；After high-pressure water descaling, steel Base temperature is down to 1020 ~ 1050 DEG C；
H, big mill are preforming：G steps steel billet feeding two-roller reversible big mill is preforming, and start rolling temperature is controlled to 1020 ~ 1050 DEG C, mill speed is controlled to 3.8 ~ 4.0m/s, and rolling pass is 7 roads, and pass schedule uses the pre- knifing pass system of butterfly, Obtain preforming rolled piece；Different rolling specs control different preforming rolled piece leg side thickness and rolled piece overall breadth dimensions；
I, universal mill tandem rolling：The preforming rolled piece of H steps is sent into 10 frame universal mill tandem rollings, rolled piece enters Continuous mill train Temperature control is 920 ~ 950 DEG C, and total rolling pass is 10 roads, and per the road of frame 1, universal mill is adjusted to two roller die formulas, rolling speed Degree is controlled to 4.5 ~ 4.8m/s；Finishing temperature control be 860 ~ 890 DEG C, finished frame outlet rolling speed control be 4.5 ~ 4.8m/s；The operation of rolling follows that " rolled piece temperature is high, appropriate to reduce tandem rolling speed；Rolled piece temperature is low, properly increases tandem rolling speed " Principle；
The online appearance and size detection of J, angle steel：The rolled piece that I steps are obtained delivers to Zaser contourgraph and carries out profile chi through runout table Very little accuracy detection, after after online shaping blades flying shear upper cold bed；
K, finishing：J step process finish after angle steel through the roller-way upper cold bed of conveying, rolled piece naturally cooled on cold bed 80 DEG C with Under；On-line straightening afterwards, aligning speed control is 4.6 ~ 4.9m/s；After angle steel is through aligning, carry out scale sawing, collection, stacking, Automatic bundling, mark, obtain final product.
Blast-melted chemical composition described in step A is 4.2 ~ 4.8wt% of C, 0.30 ~ 0.55wt% of Si, Mn 0.50 ~ 0.70wt%, 0.090 ~ 0.110wt% of P, S≤0.030wt%, remaining is Fe and inevitable impurity.
The chemical composition of the pretreated molten iron described in step A is：C 4.2~4.8wt%、Si 0.30~0.55wt%、 0.50 ~ 0.70wt% of Mn, 0.090 ~ 0.110wt% of P, S≤0.008wt%, remaining is Fe and inevitable impurity.
The chemical composition of the steel scrap described in step B is C 0.20-0.25wt%, Si 0.30-0.55wt%, Mn 1.15- 1.35wt%, P 0.020-0.037wt%, S 0.022-0.036wt%, remaining is Fe and inevitable impurity；Described The chemical composition of the pig iron be 3.0 ~ 3.3wt% of C, the 0.40 ~ 0.60wt% of wt%, Mn of Si 0.30 ~ 0.50, P 0.060 ~ 0.015 ~ 0.025wt% of 0.085wt%, S, remaining is Fe and inevitable impurity.
The chemical composition of the ferro-aluminum described in step C is Al 60.0wt%, and remaining is Fe and inevitable impurity.
The chemical composition of the Si-Ca-Ba described in step C is Si 52.4wt%, Ca 11.5wt%, Ba 13.5wt%, Al 4.2wt%, remaining is Fe and inevitable impurity.
The chemical composition of the silicomangan described in step C is Mn 65.7wt%, Si 17.2wt%, and remaining is Fe and can not The impurity for avoiding.
The chemical composition of the molybdenum-iron described in step C is Mo 57.2wt%, and remaining is Fe and inevitable impurity.
The chemical composition of the VN alloy described in step C is V 77.8wt%, N 15.8wt%, C 3.6wt%, and remaining is Fe and inevitable impurity.
No. 14-No. 18 hot-rolled angle steel chemical compositions (mass fraction) of fire resisting Q345FRB and technologic mechanicses that the present invention is provided Performance (is shown in Table 1~table 2).
The public steel structure Q345FRD fire resistings hot-rolled angle steel chemical composition for building of the invention of table 1
The public steel structure Q345FRD fire resistings for building hot-rolled angle steel technologic mechanicses performance of the invention of table 2
Embodiment 1
A, molten iron pretreatment desulfurizing：By blast-melted (chemical composition C 4.2wt%, Si 0.30wt%, Mn 0.50wt%, P 0.110wt%, S0.030wt%, remaining is Fe and inevitable impurity) it is transported to KR methods molten iron preprocessing unit and carries out desulfurization Treatment, stirring-head insertion depth is controlled to 2500mm, by 10.0 kg/tSteelAmount, add routine CaO matter desulfurizing agent carry out desulfurization Treatment, mixing time is controlled to 6 minutes；Stirring terminate after carry out taking off rear slag operation, it is ensured that in ladle molten iron face it is exposed >=3/4, Scratch clean desulfurization slag；Hot metal composition is controlled to after pretreatment：C 4.2wt%、Si 0.30wt%、Mn 0.50wt% 、P 0.110wt%、 S 0.008wt%, remaining is Fe and inevitable impurity.
B, smelting molten steel：By the pretreated molten iron of step A (C 4.2wt%, Si 0.30wt%, Mn 0.50wt%, P 0.110wt%, S 0.008wt%, remaining is Fe and inevitable impurity), high-quality steel scrap (chemical composition C 0.25wt%, Si 0.55wt%, Mn 1.35wt%, P 0.037wt%, S 0.036wt%, remaining is Fe and inevitable impurity) and the pig iron (chemical composition C 3.3wt%, Si 0.50 wt%, Mn 0.60wt%, P 0.085wt%, S 0.025wt%, remaining is for Fe and not Evitable impurity) add 120 tons of LD converters in, conventional top bottom blowing is carried out, respectively by 30.0kg/tSteel、22.0kg/ tSteel、2.0kg/tSteelAddition, add lime, light dolomite, magnesite ball slag making, control endpoint carbon content 0.08wt%, tapping 1640 DEG C of temperature；Wash heat is carried out to ladle bottom addition lime and refining slag before tapping, lime adding amount is：2.0kg/tSteel, essence Refining slag addition is：1.0kg/tSteel；Using whole bottom argon blowing technology during tapping, argon flow amount is controlled to 20NL/min.
C, deoxidation alloying：Step B is smelted the molten steel tapping for finishing, when the molten steel amount in ladle is more than 1/4, is pressed Row deoxidation alloying is sequentially：Ferro-aluminum → Si-Ca-Ba → silicomangan → molybdenum-iron → VN alloy, it is following to being added in ladle successively Material：By 0.8kg/tSteelAmount, add following mass ratio ferro-aluminum：Al 60.0wt%, remaining be Fe and inevitably it is impure Thing；By 1.0kg/tSteelAmount, add following mass ratio calsibar alloy：Si 52.4wt%, Ca 11.5wt%, Ba 13.5wt%, Al 4.2wt%, remaining is Fe and inevitable impurity；By 11.5kg/tSteelAmount, add following mass ratio Silicomangan：Mn 65.7wt%, Si 17.2wt%, remaining is Fe and inevitable impurity；By 1.4kg/tSteelAmount, add The molybdenum-iron of following mass ratio：Mo 57.2wt%, remaining is Fe and inevitable impurity；By 0.18 kg/tSteelAmount, add The VN alloy of following mass ratio：V 77.8wt%, N 15.8wt%, C 3.6wt%, remaining is Fe and inevitable impurity； Above-mentioned alloy is added when ladle molten steel amount reaches 3/4；After tapping is finished, molten steel is hung and delivers to LF stove refining procedures.
D, the refining of molten steel LF stoves：Step C tapping is finished into molten steel it is hung to LF stoves refining station and connect argon gas band, opens argon gas Using small argon amount (15NL/min) Argon 2 minutes, then bottom electrode used 7~9 grades of sluggings of gear；After being powered 3 minutes, lift electrode Slugging situation in stove is observed, thermometric determines oxygen and sampling afterwards；Add aluminum shot 0.5kg/tSteel, molten steel oxygen activity 10ppm is controlled, afterwards By 0.7kg/tSteelAmount, add following mass ratio ferrotianium：Ti 32.5wt%, remaining is Fe and inevitable impurity；With This carries out residue adjustment according to slag condition simultaneously, if slag condition is diluter, adds lime 4.0kg/tSteel, add the kg/t of calcium carbide 1.0SteelResidue adjustment, control Basicity of slag processed is 5.0；Wire feeding process, silicon of the feeding with following mass ratio are carried out after liquid steel temperature is heated into 1580 DEG C afterwards Calcium line：Si 53.5wt%, Ca 28.2wt%, remaining be Fe and inevitable impurity, wire-feeding velocity is 3.0m/s, line feeding It is 100m to measure；Line feeding terminates to use the flow carry out soft blow argon to molten steel for the small argon gas amount of 15NL/min, 6 minutes soft blow time, Molten steel covering agent is added afterwards, and addition is controlled to 1.0 kg/t steel, molten steel then is hung into casting station.
E, molten steel casting：It is 1570 DEG C in tundish temperature, pulling rate is 1.4m/min, and Water Rate for Secondary Cooling Water is 0.6L/kg, knot Brilliant device electromagnetic agitation current strength be 350A, running frequency be 2.5HZ under conditions of, using the straight machines 5 of arc continuous straightening 5 of R12m The whole process protection of D steps is cast into stream bloom casting machine the steel billet of section 230mm × 230mm.
F, heating steel billet：The steel billet of E steps is entered through rollgang feeding side inlet side outlet walking beam double-regenerative heating furnace Row heating.Blast furnace gas and air preheating temperature are all higher than 1000 DEG C, and burner hearth is adopted as micro-pressure operation, and pressure is 10Pa；Plus Hot stove soaking zone temperature control is 1200 DEG C, and the heat time is 100 minutes, and steel billet temperature is controlled to 1150 DEG C.
G, steel billet high-pressure water tank de-scaling：By F-step steel billet from after heating furnace tapping, it is 1.2m's to be delivered to length through roller-way High-pressure water tank removes removing iron scale, and the steel billet speed of service is controlled to 1.0m/s, and nozzle hydraulic pressure is 16MPa；After through high-pressure water descaling, Steel billet temperature is down to 1050 DEG C.
H, big mill are preforming：G steps steel billet feeding two-roller reversible big mill is preforming, and start rolling temperature is controlled to 1050 DEG C, mill speed is controlled to 4.0m/s, and rolling pass is 7 roads, and pass schedule uses the pre- knifing pass system of butterfly, preformation Type rolled piece leg side thickness and rolled piece beam overall are strictly controlled by code.
I, universal mill tandem rolling：H steps rolled piece is sent into 10 frame universal mill tandem rollings.Using butterfly hole type system, roll The temperature control that part enters Continuous mill train is 950 DEG C, and total rolling pass is 10 roads (per the road of frame 1), and universal mill is adjusted to two Roller die formula, mill speed is controlled to 4.8m/s；Finishing temperature control is 890 DEG C, and mill speed (finished frame outlet) is controlled to 4.6m/s.The operation of rolling follows that " rolled piece temperature is high, appropriate to reduce tandem rolling speed；Rolled piece temperature is low, properly increases tandem rolling speed " Principle.
The online appearance and size detection of J, angle steel：The rolled piece of I steps delivers to Zaser contourgraph and carries out profile chi through runout table Very little accuracy detection, after after online shaping blades flying shear upper cold bed.
K, finishing：Angle steel after the detection of I steps appearance and size is finished through the roller-way upper cold bed of conveying, rolled piece on cold bed from So it is cooled to 76 DEG C；On-line straightening afterwards, aligning speed control is 4.9m/s；After angle steel is through aligning, carries out scale sawing, receive Collection, stacking, automatic bundling, mark, that is, obtaining has 345MPa grades 14 of good anti-corrosion weatherability and superior low temperature impact flexibility Number hot-rolled angle steel, the specification (length of side × length of side × side is thick) of steel is 140mm × 140mm × 12mm, with following weight percents Chemical composition：C 0.16 wt%、Si 0.23wt%、Mn 0.85wt%、V 0.017wt%、Ti 0.015wt%、Mo The wt% of 0.080wt%, S 0.015wt%, P 0.020, remaining is Fe and inevitable impurity.
345MPa grades of No. 14 hot-rolled angle steels with excellent fire resisting shock resistance and low-temperature impact toughness that the present embodiment is provided With following process mechanical property (being shown in Table 3)；
The public steel that the present embodiment of table 3 is provided builds and builds Q345FRD fire resistings antidetonation with No. 14 hot-rolled angle steel technologic mechanicses performances
Embodiment 2
A, molten iron pretreatment desulfurizing：By blast-melted (chemical composition C 4.6wt%, Si 0.42wt%, Mn 0.60wt%, P 0.100wt%, S0.025wt%, remaining is Fe and inevitable impurity) it is transported to KR methods molten iron preprocessing unit and carries out desulfurization Treatment, stirring-head insertion depth is controlled to 2700mm, by 11.0 kg/tSteelAmount, add routine CaO matter desulfurizing agent carry out desulfurization Treatment, mixing time is controlled to 6 minutes；Stirring terminate after carry out taking off rear slag operation, it is ensured that in ladle molten iron face it is exposed >=3/4, Scratch clean desulfurization slag；Hot metal composition is controlled to after pretreatment：Chemical composition C 4.6wt%, Si 0.42wt%, Mn 0.60wt%, P 0.100wt%, S0.005wt%, remaining is Fe and inevitable impurity.
B, smelting molten steel：By the pretreated molten iron of step A (chemical composition C 4.6wt%, Si 0.42wt%, Mn 0.60wt%, P 0.100wt%, S0.005wt%, remaining is Fe and inevitable impurity), high-quality steel scrap (chemical composition C 0.22wt%, Si 0.42wt%, Mn 1.25wt%, P 0.029wt%, S 0.029wt%, remaining be Fe and inevitably it is impure Thing) and the pig iron (chemical composition C 3.1wt%, Si 0.40 wt%, Mn 0.50wt%, P 0.072wt%, S 0.020wt%, remaining Be Fe and inevitable impurity) add 120 tons of LD converters in, conventional top bottom blowing is carried out, respectively by 32.0kg/ tSteel、24.0kg/tSteel、3.0kg/tSteelAddition, add lime, light dolomite, magnesite ball slag making, control endpoint carbon content 0.10wt%, 1646 DEG C of tapping temperature；Wash heat is carried out to ladle bottom addition lime and refining slag before tapping, lime adding amount is： 2.0kg/tSteel, refining slag addition is：1.0kg/tSteel；Using whole bottom argon blowing technology during tapping, argon flow amount is controlled to 30NL/ min。
C, deoxidation alloying：Step B is smelted the molten steel tapping for finishing, when the molten steel amount in ladle is more than 1/4, is pressed Row deoxidation alloying is sequentially：Ferro-aluminum → Si-Ca-Ba → silicomangan → molybdenum-iron → VN alloy, it is following to being added in ladle successively Material：By 1.2kg/tSteelAmount, add following mass ratio ferro-aluminum：Al 60.0wt%, remaining be Fe and inevitably it is impure Thing；By 1.0kg/tSteelAmount, add following mass ratio calsibar alloy：Si 52.4wt%, Ca 11.5wt%, Ba 13.5wt%, Al 4.2wt%, remaining is Fe and inevitable impurity；By 13.6kg/tSteelAmount, add following mass ratio Silicomangan：Mn 65.7wt%, Si 17.2wt%, remaining is Fe and inevitable impurity；By 1.6kg/tSteelAmount, add The molybdenum-iron of following mass ratio：Mo 57.2wt%, remaining is Fe and inevitable impurity；By 0.29 kg/tSteelAmount, add The VN alloy of following mass ratio：V 77.8wt%, N 15.8wt%, C 3.6wt%, remaining is Fe and inevitable impurity； Above-mentioned alloy is added when ladle molten steel amount reaches 3/4；After tapping is finished, molten steel is hung and delivers to LF stove refining procedures.
D, the refining of molten steel LF stoves：Step C tapping is finished into molten steel it is hung to LF stoves refining station and connect argon gas band, opens argon gas Using small argon amount (20NL/min) Argon 2 minutes, then bottom electrode used 7~9 grades of sluggings of gear；After being powered 3 minutes, lift electrode Slugging situation in stove is observed, thermometric determines oxygen and sampling afterwards；Add aluminum shot 0.6kg/tSteel, molten steel oxygen activity 8ppm is controlled, afterwards By 1.0kg/tSteelAmount, add following mass ratio ferrotianium：Ti 32.5wt%, remaining is Fe and inevitable impurity；With This carries out residue adjustment according to slag condition simultaneously, if slag condition is diluter, adds lime 5.0kg/tSteel, add the kg/t of calcium carbide 1.0SteelResidue adjustment, control Basicity of slag processed is 5.5；Wire feeding process, silicon of the feeding with following mass ratio are carried out after liquid steel temperature is heated into 1575 DEG C afterwards Calcium line：Si 53.5wt%, Ca 28.2wt%, remaining be Fe and inevitable impurity, wire-feeding velocity is 3.0m/s, line feeding It is 100m to measure；Line feeding terminates to use the flow soft blow argon, 7 points of soft blow time are carried out to molten steel for the small argon gas amount of 15~25NL/min Clock, adds molten steel covering agent afterwards, and addition is controlled to 1.0 kg/t steel, molten steel then is hung into casting station.
E, molten steel casting：It is 1565 DEG C in tundish temperature, pulling rate is 1.3m/min, and Water Rate for Secondary Cooling Water is 0.55L/kg, M-EMS Current intensity be 350A, running frequency be 2.5HZ under conditions of, using the straight arc continuous straightenings 5 of R12m The whole process protection of D steps is cast into the stream bloom casting machine of machine 5 steel billet of section 230mm × 230mm.
F, heating steel billet：The steel billet of E steps is entered through rollgang feeding side inlet side outlet walking beam double-regenerative heating furnace Row heating.Blast furnace gas and air preheating temperature are all higher than 1000 DEG C, and burner hearth is adopted as micro-pressure operation, and pressure is 13Pa；Plus Hot stove soaking zone temperature control is 1185 DEG C, and the heat time is 90 minutes, and steel billet temperature is controlled to 1135 DEG C.
G, steel billet high-pressure water tank de-scaling：By F-step steel billet from after heating furnace tapping, it is 1.2m's to be delivered to length through roller-way High-pressure water tank removes removing iron scale, and the steel billet speed of service is controlled to 1.0m/s, and nozzle hydraulic pressure is 17MPa；After through high-pressure water descaling, Steel billet temperature is down to 1035 DEG C.
H, big mill are preforming：G steps steel billet feeding two-roller reversible big mill is preforming, and start rolling temperature is controlled to 1035 DEG C, mill speed is controlled to 3.9m/s, and rolling pass is 7 roads, and pass schedule uses the pre- knifing pass system of butterfly, preformation Type rolled piece controls leg side thickness and rolled piece overall width.
I, universal mill tandem rolling：H steps rolled piece is sent into 10 frame universal mill tandem rollings.Using butterfly hole type system, roll The temperature control that part enters Continuous mill train is 935 DEG C, and total rolling pass is 10 roads (per the road of frame 1), and universal mill is adjusted to two Roller die formula, mill speed is controlled to 4.6m/s；Finishing temperature control is 875 DEG C, and mill speed (finished frame outlet) is controlled to 4.7m/s.Because material molded breadth is flat, rapid heat dissipation, the operation of rolling follows that " rolled piece temperature is high, appropriate to reduce tandem rolling speed；Rolled piece temperature Low, properly increase tandem rolling speed " principle.
The online appearance and size detection of J, angle steel：The rolled piece of I steps is delivered into Zaser contourgraph through runout table carries out profile Dimensional accuracy detects, after after online shaping blades flying shear upper cold bed.
K, finishing：Angle steel after the detection of J steps appearance and size is finished through the roller-way upper cold bed of conveying, rolled piece on cold bed from So it is cooled to 72 DEG C；On-line straightening afterwards, aligning speed control is 4.7m/s；After angle steel is through aligning, carries out scale sawing, receive Collection, stacking, automatic bundling, mark, that is, obtaining has 345MPa grades 16 of good anti-corrosion weatherability and superior low temperature impact flexibility Number hot-rolled angle steel, the specification (length of side × length of side × side is thick) of steel is 160mm × 160mm × 14mm, with following weight percents Chemical composition：C 0.18 wt%、Si 0.28wt%、Mn 0.95 wt%、V 0.025wt%、Ti 0.022wt%、Mo 0.090wt%, S0.012wt%, P0.017 wt%, remaining is Fe and inevitable impurity.
345MPa grades of No. 16 hot-rolled angle steels with excellent fire resisting shock resistance and low-temperature impact toughness that the present embodiment is provided With following process mechanical property (being shown in Table 4)；
The public steel that the present embodiment of table 4 is provided builds and builds Q345FRD fire resistings, No. 16 hot-rolled angle steel technologic mechanicses performances of antidetonation
Embodiment 3
A, molten iron pretreatment desulfurizing：By blast-melted (chemical composition C 4.8wt%, Si 0.55wt%, Mn 0.70wt%, P 0.090wt%, S0.020wt%, remaining is Fe and inevitable impurity) it is transported to KR methods molten iron preprocessing unit and carries out desulfurization Treatment, stirring-head insertion depth is controlled to 2800mm, by 12.0 kg/tSteelAmount, add routine CaO matter desulfurizing agent carry out desulfurization Treatment, mixing time is controlled to 6 minutes；Stirring terminate after carry out taking off rear slag operation, it is ensured that in ladle molten iron face it is exposed >=3/4, Scratch clean desulfurization slag；Hot metal composition is controlled to after pretreatment：C 4.8wt%、Si 0.55wt%、Mn 0.70wt% 、P 0.090wt%、 S0.003wt%, remaining is Fe and inevitable impurity.
B, smelting molten steel：By the pretreated molten iron of step A (C 4.8wt%, Si 0.55wt%, Mn 0.70wt%, P 0.090wt%, S0.003wt%, remaining is Fe and inevitable impurity), high-quality steel scrap (chemical composition C 0.20wt%, Si 0.30wt%, Mn 1.15wt%, P 0.020wt%, S 0.022wt%, remaining is Fe and inevitable impurity) and the pig iron (chemical composition C 3.0wt%, Si 0.30 wt%, Mn 0.40wt%, P 0.060wt%, S 0.015wt%, remaining is for Fe and not Evitable impurity) add 120 tons of LD converters in, conventional top bottom blowing is carried out, respectively by 33.0kg/tSteel、26.0kg/ tSteel、4.0kg/tSteelAddition, add lime, light dolomite, magnesite ball slag making, control endpoint carbon content 0.12wt%, tapping 1650 DEG C of temperature；Wash heat is carried out to ladle bottom addition lime and refining slag before tapping, lime adding amount is：2.0kg/tSteel, essence Refining slag addition is：1.0kg/tSteel；Using whole bottom argon blowing technology during tapping, argon flow amount is controlled to 40NL/min.
C, deoxidation alloying：Step B is smelted the molten steel tapping for finishing, when the molten steel amount in ladle is more than 1/4, is pressed Row deoxidation alloying is sequentially：Ferro-aluminum → Si-Ca-Ba → silicomangan → molybdenum-iron → VN alloy, it is following to being added in ladle successively Material：By 1.5kg/tSteelAmount, add following mass ratio ferro-aluminum：Al 60.0wt%, remaining be Fe and inevitably it is impure Thing；By 1.0kg/tSteelAmount, add following mass ratio calsibar alloy：Si 52.4wt%, Ca 11.5wt%, Ba 13.5wt%, Al 4.2wt%, remaining is Fe and inevitable impurity；By 15.7kg/tSteelAmount, add following mass ratio Silicomangan：Mn 65.7wt%, Si 17.2wt%, remaining is Fe and inevitable impurity；By 1.7kg/tSteelAmount, add The molybdenum-iron of following mass ratio：Mo 57.2wt%, remaining is Fe and inevitable impurity；By 0.38 kg/tSteelAmount, add The VN alloy of following mass ratio：V 77.8wt%, N 15.8wt%, C 3.6wt%, remaining is Fe and inevitable impurity； Above-mentioned alloy is added when ladle molten steel amount reaches 3/4；After tapping is finished, molten steel is hung and delivers to LF stove refining procedures.
D, the refining of molten steel LF stoves：Step C tapping is finished into molten steel it is hung to LF stoves refining station and connect argon gas band, opens argon gas Using small argon amount (25NL/min) Argon 2 minutes, then bottom electrode used 7~9 grades of sluggings of gear；After being powered 3 minutes, lift electrode Slugging situation in stove is observed, thermometric determines oxygen and sampling afterwards；Add aluminum shot 0.8kg/tSteel, molten steel oxygen activity 6ppm is controlled, afterwards By 1.3kg/tSteelAmount, add following mass ratio ferrotianium：Ti 32.5wt%, remaining is Fe and inevitable impurity；With This carries out residue adjustment according to slag condition simultaneously, if slag condition is diluter, adds lime 6.0kg/tSteel, add the kg/t of calcium carbide 1.0SteelResidue adjustment, control Basicity of slag processed is 6.0；Wire feeding process, silicon of the feeding with following mass ratio are carried out after liquid steel temperature is heated into 1570 DEG C afterwards Calcium line：Si 53.5wt%, Ca 28.2wt%, remaining be Fe and inevitable impurity, wire-feeding velocity is 3.0m/s, line feeding It is 100m to measure；Line feeding terminates to use the flow carry out soft blow argon to molten steel for the small argon gas amount of 25NL/min, 8 minutes soft blow time, Molten steel covering agent is added afterwards, and addition is controlled to 1.0 kg/t steel, molten steel then is hung into casting station.
E, molten steel casting：It is 1560 DEG C in tundish temperature, pulling rate is 1.2m/min, and Water Rate for Secondary Cooling Water is 0.5L/kg, knot Brilliant device electromagnetic agitation current strength be 350A, running frequency be 2.5HZ under conditions of, using the straight machines 5 of arc continuous straightening 5 of R12m The whole process protection of D steps is cast into stream bloom casting machine the steel billet of section 230mm × 230mm；
F, heating steel billet：The steel billet of E steps is added through rollgang feeding side inlet side outlet walking beam double-regenerative heating furnace Heat.Blast furnace gas and air preheating temperature are all higher than 1000 DEG C, and burner hearth is adopted as micro-pressure operation, and pressure is 15Pa；Heating furnace Soaking zone temperature control is 1170 DEG C, and the heat time is 80 minutes, and steel billet temperature is controlled to 1120 DEG C.
G, steel billet high-pressure water tank de-scaling：By F-step steel billet from after heating furnace tapping, it is 1.2m's to be delivered to length through roller-way High-pressure water tank removes removing iron scale, and the steel billet speed of service is controlled to 1.0m/s, and nozzle hydraulic pressure is 18MPa；After through high-pressure water descaling, Steel billet temperature is down to 1020 DEG C.
H, big mill are preforming：G steps steel billet feeding two-roller reversible big mill is preforming, and start rolling temperature is controlled to 1020 DEG C, mill speed is controlled to 3.8m/s, and rolling pass is 7 roads, and pass schedule uses the pre- knifing pass system of butterfly, preformation The good leg side thickness of type rolled piece priority control and rolled piece beam overall.
I, universal mill tandem rolling：H steps rolled piece is sent into 10 frame universal mill tandem rollings.Using butterfly hole type system, roll The temperature control that part enters Continuous mill train is 920 DEG C, and total rolling pass is 8 roads (two frame F9, F10 are empty after wherein crosses), omnipotent to roll Machine is adjusted to two roller die formulas, and mill speed is controlled to 4.5m/s；Finishing temperature control is 860 DEG C, and (finished frame goes out mill speed Mouthful) it is controlled to 4.8m/s；Because material molded breadth is flat, rapid heat dissipation, the operation of rolling follows that " rolled piece temperature is high, appropriate to reduce tandem rolling speed； Rolled piece temperature is low, properly increases tandem rolling speed " principle.
The online appearance and size detection of J, angle steel：The rolled piece of I steps is delivered into Zaser contourgraph through runout table carries out profile Dimensional accuracy detects, after after online shaping blades flying shear upper cold bed.
K, finishing：Angle steel after the detection of J steps appearance and size is finished through the roller-way upper cold bed of conveying, rolled piece on cold bed from So it is cooled to 65 DEG C；On-line straightening afterwards, aligning speed control is 4.6m/s；After angle steel is through aligning, carries out scale sawing, receive Collection, stacking, automatic bundling, mark, that is, obtaining has 345MPa grades 18 of good anti-corrosion weatherability and superior low temperature impact flexibility Number hot-rolled angle steel, the specification (length of side × length of side × side is thick) of steel is 180mm × 180mm × 16mm, with following weight percents Chemical composition：C 0.21 wt%、Si 0.33 wt%、Mn 1.05 wt%、V 0.032wt%、Ti 0.030wt%、Mo The wt% of 0.100wt%, S 0.010wt%, P 0.014, remaining is Fe and inevitable impurity.
345MPa grades of No. 18 hot-rolled angle steels with excellent fire resisting shock resistance and low-temperature impact toughness that the present embodiment is provided With following process mechanical property (being shown in Table 5)；
The public steel that the present embodiment of table 5 is provided builds and builds Q345FRD fire resistings, No. 18 hot-rolled angle steel technologic mechanicses performances of antidetonation

Claims (10)

1. a kind of public steel structure earthquake-resistant hot rolled angle steel of Q345FRD fire resistings for building, it is characterised in that described fire resisting is earthquake-resistant hot rolled Angle steel is by molten iron pretreatment desulfurizing, smelting molten steel, deoxidation alloying, the refining of molten steel LF stoves, molten steel casting, steel billet by molten iron Heating, the de-scaling of steel billet high-pressure water tank, preforming big mill, universal mill tandem rolling, the online appearance and size detection of angle steel, finishing system For what is obtained, the chemical composition with following weight percents：C 0.16~0.21 wt%, Si 0.23~0.33 wt%, Mn 0.85~1.05 0.017~0.032wt% of wt%, V, 0.015~0.030wt% of Ti, 0.080~0.100wt% of Mo, S≤ 0.015wt%, P≤0.020 wt%, remaining is Fe and inevitable impurity.
2. a kind of preparation method of the public steel structure earthquake-resistant hot rolled angle steel of Q345FRD fire resistings for building according to claim 1, It is characterized in that comprising the following steps：
A, molten iron pretreatment desulfurizing：The blast-melted KR methods molten iron preprocessing unit that is transported to is carried out into desulfurization process, stirring-head insertion Severity control is 2500 ~ 2800mm, by the amount of 10.0~12.0 kg/t steel, adds CaO matter desulfurizing agent to carry out desulfurization process, is taken off Sulphur mixing time is controlled to 6 minutes；Stirring terminate after carry out taking off rear slag operation, it is ensured that in ladle molten iron face it is exposed >=3/4, scratch clean Desulfurization slag, obtains pretreated molten iron；
B, smelting molten steel：By in the pretreated molten iron of step A, high-quality steel scrap and the pig iron 120 tons of LD converters of addition, top bottom is carried out Top-bottom blowing, respectively by 30.0~33.0kg/t steel, 22.0~26.0kg/t steel, 2.0~4.0kg/t steel addition, add Lime, light dolomite, magnesite ball slag making, control endpoint carbon content >=0.08wt%, tapping temperature≤1650 DEG C；Tapping before to Ladle bottom adds lime and refining slag carries out wash heat, and lime adding amount is 2.0kg/t steel, and refining slag addition is 1.0kg/t Steel；Using whole bottom argon blowing technology during tapping, argon flow amount is controlled to 20~40NL/min；
C, deoxidation alloying：Step B is smelted the molten steel tapping for finishing, when the molten steel amount in ladle is more than 1/4, by following de- Oxygen alloyization is sequentially：Ferro-aluminum → Si-Ca-Ba → silicomangan → molybdenum-iron → VN alloy, successively to adding following alloy in ladle： By the amount of 0.8~1.5kg/t steel, ferro-aluminum is added；By the amount of 1.0kg/t steel, Si-Ca-Ba is added；By 11.5~15.7kg/t steel Amount, adds silicomangan；By the amount of 1.4~1.7kg/t steel, molybdenum-iron is added；By the amount of 0.18~0.38 kg/t steel, vanadium is added Nitrogen alloy；Above-mentioned alloy is added when ladle molten steel amount reaches 3/4；After tapping is finished, molten steel is hung and delivers to LF stove refining procedures；
D, the refining of molten steel LF stoves：Step C tapping is finished into molten steel it is hung to LF stoves refining station and connect argon gas band, opens argon gas and use 15~25NL/min Argons 2 minutes, then bottom electrode is using 7~9 grades of sluggings of gear；After being powered 3 minutes, in lift electrode observation stove Slugging situation, afterwards thermometric determine oxygen and sampling；Aluminum shot 0.5~0.8kg/t steel is added, molten steel oxygen activity≤10ppm is controlled, afterwards By the amount of 0.7~1.3kg/t steel, the ferrotianium of following mass ratio is added：Ti 32.5wt%, remaining be Fe and inevitably it is impure Thing；At the same time, residue adjustment is carried out according to slag condition, if slag condition is diluter, adds lime 4.0~6.0kg/t steel, add calcium carbide 1.0 Kg/t steel residue adjustments, it is 5.0~6.0 to control basicity of slag；Carried out at line feeding after liquid steel temperature is heated into 1570~1580 DEG C afterwards Reason, silicon-calcium wire of the feeding with following mass ratio：Si 53.5wt%, Ca 28.2wt%, remaining be Fe and inevitably it is impure Thing, wire-feeding velocity is 3.0m/s, and line feeding amount is 100m；It is the small argon gas amount of 15~25NL/min to steel that line feeding terminates to use flow Water carries out soft blow argon, and soft blow time >=6 minute add molten steel covering agent afterwards, and addition is controlled to 1.0 kg/t steel, then will Molten steel is hung to casting station；
E, molten steel casting：It it is 1560~1570 DEG C in tundish temperature, pulling rate is 1.2~1.4m/min, and Water Rate for Secondary Cooling Water is 0.5 ~0.6L/kg, M-EMS Current intensity be 350A, running frequency be 2.5HZ under conditions of, using the straight arcs of R12m The molten steel whole process protection of D steps is cast into the stream bloom casting machine of 5 machine of continuous straightening 5 steel billet of section 200mm × 200mm；
F, heating steel billet：The steel billet of E steps is added through rollgang feeding side inlet side outlet walking beam double-regenerative heating furnace Heat, blast furnace gas and air preheating temperature are all higher than 1000 DEG C, and burner hearth is adopted as micro-pressure operation, and pressure is 10 ~ 15Pa；Heating Stove soaking zone temperature control is 1170 ~ 1200 DEG C, and the heat time is 80 ~ 100 minutes, and steel billet temperature is controlled to 1120 ~ 1150 DEG C；
G, steel billet high-pressure water tank de-scaling：F-step steel billet is delivered to the water under high pressure that length is 1.2m from after heating furnace tapping through roller-way Case removes removing iron scale, and the steel billet speed of service is controlled to 1.0m/s, and nozzle hydraulic pressure is 16 ~ 18MPa；After high-pressure water descaling, steel Base temperature is down to 1020 ~ 1050 DEG C；
H, big mill are preforming：G steps steel billet feeding two-roller reversible big mill is preforming, and start rolling temperature is controlled to 1020 ~ 1050 DEG C, mill speed is controlled to 3.8 ~ 4.0m/s, and rolling pass is 7 roads, and pass schedule uses the pre- knifing pass system of butterfly, Obtain preforming rolled piece；
I, universal mill tandem rolling：The preforming rolled piece of H steps is sent into 10 frame universal mill tandem rollings, rolled piece enters Continuous mill train Temperature control is 920 ~ 950 DEG C, and total rolling pass is 10 roads, and per the road of frame 1, universal mill is adjusted to two roller die formulas, rolling speed Degree is controlled to 4.5 ~ 4.8m/s；Finishing temperature control be 860 ~ 890 DEG C, finished frame outlet rolling speed control be 4.5 ~ 4.8m/s；The operation of rolling follows that " rolled piece temperature is high, appropriate to reduce tandem rolling speed；Rolled piece temperature is low, properly increases tandem rolling speed " Principle；
The online appearance and size detection of J, angle steel：The rolled piece that I steps are obtained delivers to Zaser contourgraph and carries out profile chi through runout table Very little accuracy detection, after after online shaping blades flying shear upper cold bed；
K, finishing：J step process finish after angle steel through the roller-way upper cold bed of conveying, rolled piece naturally cooled on cold bed 80 DEG C with Under；On-line straightening afterwards, aligning speed control is 4.6 ~ 4.9m/s；After angle steel is through aligning, carry out scale sawing, collection, stacking, Automatic bundling, mark, obtain final product.
3. the preparation method of the public steel structure according to claim 2 earthquake-resistant hot rolled angle steel of Q345FRD fire resistings for building, it is special Levy be blast-melted chemical composition described in step A for 4.2 ~ 4.8wt% of C, 0.30 ~ 0.55wt% of Si, Mn 0.50 ~ 0.090 ~ 0.110wt% of 0.70wt%, P, S≤0.030wt%, remaining is Fe and inevitable impurity.
4. the preparation method of the public steel structure according to claim 2 earthquake-resistant hot rolled angle steel of Q345FRD fire resistings for building, it is special Levy is that the chemical composition of pretreated molten iron described in step A is：C 4.2~4.8wt%、Si 0.30~0.55wt%、Mn 0.50 ~ 0.70wt%, 0.090 ~ 0.110wt% of P, S≤0.008wt%, remaining is Fe and inevitable impurity.
5. the preparation method of the public steel structure according to claim 2 earthquake-resistant hot rolled angle steel of Q345FRD fire resistings for building, it is special Levy is that the chemical composition of steel scrap described in step B is C 0.20-0.25wt%, Si 0.30-0.55wt%, Mn 1.15- 1.35wt%, P 0.020-0.037wt%, S 0.022-0.036wt%, remaining is Fe and inevitable impurity；Described The chemical composition of the pig iron be 3.0 ~ 3.3wt% of C, the 0.40 ~ 0.60wt% of wt%, Mn of Si 0.30 ~ 0.50, P 0.060 ~ 0.015 ~ 0.025wt% of 0.085wt%, S, remaining is Fe and inevitable impurity.
6. the preparation method of the public steel structure according to claim 2 earthquake-resistant hot rolled angle steel of Q345FRD fire resistings for building, it is special It is that the chemical composition of ferro-aluminum described in step C is Al 60.0wt% to levy, and remaining is Fe and inevitable impurity.
7. the preparation method of the public steel structure according to claim 2 earthquake-resistant hot rolled angle steel of Q345FRD fire resistings for building, it is special Levy is that the chemical composition of Si-Ca-Ba described in step C is Si 52.4wt%, Ca 11.5wt%, Ba 13.5wt%, Al 4.2wt%, remaining is Fe and inevitable impurity.
8. the preparation method of the public steel structure according to claim 2 earthquake-resistant hot rolled angle steel of Q345FRD fire resistings for building, it is special It is that the chemical composition of silicomangan described in step C is Mn 65.7wt%, Si 17.2wt% to levy, and remaining is Fe and can not keep away The impurity exempted from.
9. the preparation method of the public steel structure according to claim 2 earthquake-resistant hot rolled angle steel of Q345FRD fire resistings for building, it is special It is that the chemical composition of molybdenum-iron described in step C is Mo 57.2wt% to levy, and remaining is Fe and inevitable impurity.
10. the preparation method of the public steel structure according to claim 2 earthquake-resistant hot rolled angle steel of Q345FRD fire resistings for building, its The chemical composition of the VN alloy being characterised by described in step C is V 77.8wt%, N 15.8wt%, C 3.6wt%, and remaining is Fe and inevitable impurity.
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