CN110106443A - A kind of superhigh intensity bolt round-bar pass method - Google Patents
A kind of superhigh intensity bolt round-bar pass method Download PDFInfo
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- CN110106443A CN110106443A CN201910465068.XA CN201910465068A CN110106443A CN 110106443 A CN110106443 A CN 110106443A CN 201910465068 A CN201910465068 A CN 201910465068A CN 110106443 A CN110106443 A CN 110106443A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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- 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
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- 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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- 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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a kind of superhigh intensity bolt round-bar pass methods, include the following steps: (1) using molten iron and steel scrap as raw material, it is smelted using ultra high power eccentric-bottom type electric furnace, (2) material is refined using LF refining furnace, (3) it is deaerated using VD vacuum drying oven, and feed core-spun yarn, (4) continuous casting processing is carried out using circular-arc type continuous casting machine, (5) steel rolling, (6) cogging, (7) pusher-type furnace carries out heating steel billet, (8) stacking slow cooling, (9) heat treatment.The present invention uses more optimal heat treatment process, and the mechanical property of product is made to play the more prominent high intensity and the requirement of high tenacity for meeting product.
Description
Technical field
The present invention relates to round-bar pass technical field more particularly to a kind of superhigh intensity bolt round-bar pass methods.
Background technique
In recent years, with the high speed development of the various industries such as China's automobile, wind-powered electricity generation, machinery, building, light industry, to manufacture
More stringent requirements are proposed for the material that the parts such as all kinds of fasteners (such as bolt, nut) use.Desired strength is higher, impacts tough
Property is more preferable.Current 10.9 grade bolt generally uses, but the requirement that tensile strength is only 1000MPa is no longer satisfied portion
The automobile industry and wind-powered electricity generation industry of branch trade, especially light-weight design.The product of higher intensity, such as tension are needed thus
Intensity requirement > 1400MPa.But it is not related to producing tensile strength requirement > 1400MPa in the prior art, is used in
Round steel on 14.9 grade super strength bolts.
Therefore, a kind of new superhigh intensity bolt round-bar pass method is developed, not only there is urgent researching value, also have
There are good economic benefit and commercial application potentiality, where this power exactly of the invention being accomplished and basis
Summary of the invention
In order to overcome the defect of the prior art as indicated above, the present inventor has made intensive studies this, is paying
After a large amount of creative works, so as to complete the present invention.
Specifically, the technical problems to be solved by the present invention are: providing a kind of superhigh intensity bolt round-bar pass side
Method, with performances, the especially performances such as the tensile strength of round steel after Overheating Treatment such as the tensile strength that improves round steel.
In order to solve the above technical problems, the technical scheme is that
A kind of superhigh intensity bolt round-bar pass method includes the following steps: (1) using molten iron and steel scrap as former
Material, is smelted using ultra high power eccentric-bottom type electric furnace, and (2) refine material using LF refining furnace, and (3) are true using VD
Empty furnace degassing, and core-spun yarn is fed, (4) carry out continuous casting processing, (5) steel rolling, (6) cogging, (7) steel-pushing type using circular-arc type continuous casting machine
Heating furnace carries out heating steel billet, (8) stacking slow cooling, (9) heat treatment.
In the present invention, as a kind of perferred technical scheme, step (1) specifically comprises the processes of: adopted during electric furnace smelting
Groped to carry out electric furnace smelting with 50%~70% molten iron+steel scrap raw material proportioning, tapping controls C content wt >=0.06%, out
Steel P content wt≤0.010%；Add SiCaBaAl 1.0kg/t, the strong deoxidation of steel-core-aluminium 2.0kg/t, ferroalloy when 15~20t of tapping
Material, (phosphorus content > 90wt%'s) carburant, slag charge are then added in packet, and the tapping later period carries out argon gas using 0.3~0.4MPa
Strong mixing, with uniform temperature and ingredient, and deoxidation products is promoted to float.
In the present invention, as a kind of perferred technical scheme, step (2) specifically comprises the processes of: refining furnace calcium carbide early period
It with silicon carbide diffusive deoxidation, is formed stablize white slag as early as possible, the dual alkalinity R control of white slag is 4.0~6.0, Design of Chemical Composition
Target: C, Si content wt press the control of 0.39~0.43%, 0.23~0.27% lower limit respectively；Mn, Cr, Mo, V content wt are pressed
0.62%, 1.02%, 0.54%, 0.58% target value controls；P, S content wt :≤0.015%；Al content wt :≤0.015%；
LF refining finishing slag dual alkalinity R2 >=4.5, the chemical composition wt% of LF refining finishing slag are as follows: CaO 50~65%,
SiO27~15%, MgO 0.4~1.2%, Al2O325~30%, S 0.3~0.5%, FeO≤0.50%.
In the present invention, as a kind of perferred technical scheme, step (3) specifically comprises the processes of: in 1650 ± 10 DEG C, vacuum
Degree, which is less than under 67Pa, keeps 15min or more to carry out VD Fruit storage, and after treatment feeds 1.5~2.5m/t steel CaSi packet
Core wire, 8~15min of the soft stirring of argon gas before bull ladle.
The chemical Composition Control target wt% of step (3) material are as follows: 0.41%C, 0.25%Si, 0.62%Mn, 1.02%
Cr, 0.54%Mo, 0.28%V, S≤0.015%, P≤0.015%, Al≤0.015%.
In the present invention, as a kind of perferred technical scheme, step (4) specifically comprises the processes of: big packet long nozzle uses Ar
Seal apparatus flows whole blowing argon to big Baogang, and the degree of superheat selects carbon in 150mm × 150mm rectangular bloom dedicated at 20~45 DEG C
Covering slag, 1.50 ± 0.15m/min of pulling rate, conticaster use M-EMS 3Hz/480A.
In the present invention, as a kind of perferred technical scheme, step (5) specifically comprises the processes of: steel rolling using 150mm ×
150mm square type base combined type phosphorus removing method is aided with installation cuneate lespedeza de-scaling on rollgang using 18-22MPa high-pressure water descaling
Device.
In the present invention, as a kind of perferred technical scheme, step (6) specifically comprises the processes of: steel rolling with 150mm ×
150mm square type base is raw material base, after the intermediate square billet using 88 × 88mm of Φ 550mm blooming mill production, is rolled into 31~Φ of Φ
40mm steel；After the intermediate square billet for producing 68 × 68mm using Φ 550mm blooming mill, it is rolled into Φ 16~Φ 30mm steel.
In the present invention, as a kind of perferred technical scheme, step (7) specifically comprises the processes of: when heating steel billet uses long
Between elevated heating processes, 150mm × 150mm uses pusher-type furnace, using heating I section of temperature control at 1050-1070 DEG C,
The control of II section of temperature is heated at 1190-1210 DEG C, soaking section temperature is controlled at 1200-1220 DEG C, heat in total 160 minutes plus
The uniform diffusion of thermal process guarantee steel.
In the present invention, as a kind of perferred technical scheme, step (8) specifically comprises the processes of: adopted after steel rolling
Stacking slow cooling mode is concentrated with 350 DEG C of lees of >, further goes de-stress.
In the present invention, as a kind of perferred technical scheme, step (9) specifically comprises the processes of: with 900 DEG C of heating and thermal insulations,
After the quick bright quenching oil hardening of LT18A, using 500 DEG C and 600 DEG C of two limiting temperatures tempering.
Compared with prior art, the present invention having following obvious advantage:
The present invention be inventor be in long-term practice, by largely repeatedly test, paid creative work and touched
What rope obtained, the harden ability and impact flexibility of round steel design after optimizing when emphasis of the present invention have been directed to smelting, design
Product can satisfy tensile strength >=1400MPa by the heat treatment process after optimization, and yield strength >=1300MPa is had no progeny and stretched
Long rate >=10%, the contraction percentage of area >=43%, -20 DEG C of AKV >=27J (average value).
In the present invention, strictly screened the element species added in round steel, and to the various elements weight ratio in round steel into
Go stringent control, wherein Cr element belongs to the element for reducing austenite phase field, can dramatically increase the harden ability of steel, but
It is that Cr element can increase steel belt roof bolt brittleness tendency, requires supplementation with make up its brittleness tendency using other alloying elements thus.?
In step (2), Mo content is had adjusted, Mo element belongs to the element for reducing austenite phase field, for the harden ability element for increasing steel, together
The heat resistance of Shi Tigao product, prevents temper brittleness.Vanadium is carbide, has similar characteristic with chromium, vanadium
It is little to add content, generally all below 0.50%；And crystal grain can be refined, the vanadium carbide nitride being precipitated in higher temperature tempering
In addition to it can further improve steel ingot intensity, due also to vanadium carbide nitride have stronger trap energy, can paved set hydrogen make it equably
It is dispersed in transgranular, inhibits the diffusion of hydrogen, so as to improve the resistance for delayed fracture of steel.Al element belongs to strong deoxidier, plays de-
Oxygen determines the effect of nitrogen, and can refine crystal grain.But aluminium element can fight for the nitrogen content in steel with vanadium, it is therefore desirable to stringent control
Al content in steel processed.It is calculated according to the solubility of Al, if the Al in steel all and when the combination of oxygen, content of the Al in steel
It is up to 0.015%, therefore is up to 0.015% to the content requirement of Al in ingredient design process, is guaranteeing the same of deoxidation
When reduce AlN precipitation, reduce Al and V contention steel in nitrogen.Also, in step (2), spread using top of the slag Al de-
Oxygen, to substitute the Al of electric furnace steel tapping addition, the Al content that can have both reduced in steel also ensures deoxidation effect.Step (3) is appropriate
Ti line has been fed, Ti element is properly added, can play the role of enhancing hydrogen trap.
In short, round steel provided by the invention, carries out the essential elements such as C, Si, Mn, Cr, Mo, V to strengthen harden ability design,
Control is in more usual narrower range, and steel uniformity is good and properties of product fluctuation range reduces.The present invention is stayed using electric furnace
Steel remaining slag operation, refining furnace make high basicity slag, realize low P and low S control.And it is poured using VD vacuum outgas and argon gas protection
Note, controls the impurity contents such as H, O, N, to reduce the quantity of nonmetallic inclusionsin steel, makes its fine dispersion, change
The low temperature ductile-brittle transition temperature of kind steel.The present invention uses the continuous casting billet of continuous casting process production, has using electromagnetic agitating technology
Effect improves steel consistency and component segregation.The invention reside in reduce the AlN in steel using control Al content enhancing carbon is precipitated
Vanadium nitride generates, and not only meets the requirement of refinement crystal grain, while improving hydrogen trap, the work of less hydrogen induced cracking and delayed fracture
With.The invention reside in more optimal heat treatment process is used, so that the mechanical property of product is played more protrusion and meet product
High-intensitive and high tenacity requirement.
Detailed description of the invention
Fig. 1 is 900 DEG C of heating and thermal insulation oil quenchings of steel (JNCGQLS) that the embodiment of the present invention 2 produces, 500 DEG C of heating and thermal insulation water
The metallographic structure schematic diagram of cold 500 times of amplification；
Fig. 2 is 900 DEG C of heating and thermal insulation oil quenchings of steel (JNCGQLS) that the embodiment of the present invention 2 produces, 600 DEG C of heating and thermal insulation water
The metallographic structure schematic diagram of cold 500 times of amplification；
Fig. 3 is 880 DEG C of heating and thermal insulation oil quenchings of traditional steel (42CrMoA), and 500 DEG C of heating and thermal insulation water coolings amplify 500 times of gold
Phase constitution schematic diagram；
Fig. 4 is 880 DEG C of heating and thermal insulation oil quenchings of traditional steel (42CrMoA), and 600 DEG C of heating and thermal insulation water coolings amplify 500 times of gold
Phase constitution schematic diagram.
Specific embodiment
Below with reference to specific embodiment, the present invention is further described.But the purposes and mesh of these exemplary embodiments
Be only used to enumerate the present invention, any type of any restriction not is constituted to real protection scope of the invention, it is more non-to incite somebody to action this
The protection scope of invention is confined to this.
A kind of superhigh intensity bolt round-bar pass method includes the following steps: (1) using molten iron and steel scrap as former
Material, is smelted using ultra high power eccentric-bottom type electric furnace, and (2) refine material using LF refining furnace, and (3) are true using VD
Empty furnace degassing, and core-spun yarn is fed, (4) carry out continuous casting processing, (5) steel rolling, (6) cogging, (7) steel-pushing type using circular-arc type continuous casting machine
Heating furnace carries out heating steel billet, (8) stacking slow cooling, (9) heat treatment.
Embodiment 1
With the Φ 31mm stocking that 150mm × 150mm section rectangular billet CC produces, performance entirely reaches technical requirements.Tool
Body technology method is as follows:
(1) it is smelted using ultra high power eccentric-bottom type electric furnace: electric furnace smelting using 45t molten iron and steel scrap as raw material
Molten iron+steel scrap raw material proportioning during refining using 50% gropes to carry out electric furnace smelting, and the control C content wt that taps >=
0.06%, P content wt≤0.010% of tapping；Add SiCaBaAl 1.0kg/t, the strong deoxidation of steel-core-aluminium 1.5kg/t when tapping 15t,
Iron alloy material, carburant, slag charge are then added in packet, and the tapping later period uses argon gas strong mixing, with uniform temperature and ingredient, and promote
It floats into deoxidation products；
(2) material is refined using LF refining furnace；Refining furnace calcium carbide early period and silicon carbide diffusive deoxidation, as early as possible shape
At white slag is stablized, the dual alkalinity R control of white slag is 4.0, and Design of Chemical Composition target: C, Si, Mn, Cr, Mo, V content wt divide
Not An 0.39~0.43%, 0.23~0.27%, 0.60~0.65%, 1.00~1.05%, 0.53~0.55%, 0.27~
The control of 0.30% target value；P, S content wt :≤0.015%；Al content wt :≤0.015%；LF refining finishing slag dual alkalinity R2
It is 4.5, the chemical composition wt% of LF refining finishing slag are as follows: CaO 50~65%, SiO27~15%, MgO 0.4~1.2%,
Al2O325~30%, S 0.3~0.5%, FeO≤0.50%；Final melting finished product ingredient controls situation respectively is:
(3) deaerated using VD vacuum drying oven, and feed core-spun yarn: kept in the case where 1630 DEG C, vacuum degree are less than 67Pa 15min with
Upper progress VD Fruit storage, after treatment feed 1.5m/t steel CaSi core-spun yarn, the soft stirring 10min of argon gas before bull ladle.
(4) carry out continuous casting processing using circular-arc type continuous casting machine: big packet long nozzle uses Ar seal apparatus, blows big Baogang stream whole process
Argon protection, the degree of superheat select carbon mould flux in 150mm × 150mm rectangular bloom, pulling rate 1.35m/min, conticaster at 20 DEG C
Using M-EMS 3Hz/480A；
(5) steel rolling: steel rolling uses 150mm × 150mm square type base combined type phosphorus removing method, using 18MPa high-pressure water descaling,
It is aided with installation cuneate lespedeza de-scaling device on rollgang；
(6) cogging, steel rolling using 150mm × 150mm square type base as raw material base, using Φ 550mm blooming mill production 88 ×
After the intermediate square billet of 88mm, it is rolled into Φ 31mm steel；
(7) pusher-type furnace carry out heating steel billet: heating steel billet use long-time elevated heating processes, 150mm ×
150mm uses pusher-type furnace, using I section of temperature control of heating at 950 DEG C, heats II section of temperature control at 1180 DEG C,
Hot arc temperature is controlled at 1200 DEG C, and the heating process heated in total 180 minutes guarantees the uniform diffusion of steel；
(8) stacking slow cooling: stacking slow cooling mode is concentrated using 355 DEG C of lees after steel rolling, is further removed
Stress；
(9) be heat-treated: use 900 DEG C of heating and thermal insulations, after the quick bright quenching oil hardening of LT18A, using 500 DEG C with
600 DEG C of two limiting temperatures tempering.
Round steel (JNCGQLS) performance manufactured in the present embodiment is as follows:
Embodiment 2
The Φ 34mm stocking of 150mm × 150mm section rectangular billet CC production, performance entirely reach technical requirements.Specifically
Process is as follows:
(1) it uses the high-quality molten iron of 45t for main material, is smelted using ultra high power eccentric-bottom type electric furnace: electric furnace smelting
Electric furnace smelting is carried out using molten iron in the process, tapping control C content wt is 0.08%, P content wt≤0.010% of tapping；Tapping
Adding SiCaBaAl 1.2kg/t, steel-core-aluminium 2.0kg/t strong deoxidation when 18t, iron alloy material, carburant, slag charge are then added in packet,
The later period tap using argon gas strong mixing, with uniform temperature and ingredient, and deoxidation products is promoted to float；
(2) material is refined using LF refining furnace；Refining furnace calcium carbide early period and silicon carbide diffusive deoxidation, as early as possible shape
At white slag is stablized, guarantee the good basicity of refining slag and mobility, the dual alkalinity R control of white slag is 4.8, Design of Chemical Composition
Target: C, Si, Mn, Cr, Mo, V content wt press CaO 64.1%, SiO28.76%, MgO 0.64% respectively,
Al2O325.08%, S 0.47% the rest is TFe (Mn)；LF refining finishing slag dual alkalinity R2 is 4.5, the change of LF refining finishing slag
Learn composition wt% are as follows: CaO 58.02%, SiO212.89%, MgO 0.38%, Al2O330.72%, S 0.39% the rest is
TFe(Mn)；Refining tapping C, Si, Mn, Cr, V, Mo, Al, P, S press internal control specifications control, and final melting finished product ingredient controls respectively
Situation is:
(3) deaerated using VD vacuum drying oven, and feed core-spun yarn: kept in the case where 1655 DEG C, vacuum degree are less than 67Pa 15min with
Upper progress VD Fruit storage, after treatment feeds 2m/t steel CaSi core-spun yarn, while charring rice husk is added and carries out molten steel
Protection covering, the soft stirring 15min of argon gas before bull ladle, 1560 DEG C of bull ladle temperature；
(4) carry out continuous casting processing using circular-arc type continuous casting machine: big packet long nozzle uses Ar seal apparatus, blows big Baogang stream whole process
Argon protection, the degree of superheat select carbon mould flux in 150mm × 150mm rectangular bloom, pulling rate 1.50m/min, conticaster at 35 DEG C
Using M-EMS 3Hz/480A, casting blank solidification segregation tendency is reduced；
(5) steel rolling: steel rolling uses 150mm × 150mm square type base combined type phosphorus removing method, using 20MPa high-pressure water descaling,
It is aided with installation cuneate lespedeza de-scaling device on rollgang；
(6) cogging, steel rolling using 150mm × 150mm square type base as raw material base, using Φ 550mm blooming mill production 88 ×
After the intermediate square billet of 88mm, it is rolled into Φ 34mm steel；
(7) pusher-type furnace carry out heating steel billet: heating steel billet use long-time elevated heating processes, 150mm ×
150mm uses pusher-type furnace, using I section of temperature control of heating at 1050 DEG C, heats II section of temperature control at 1200 DEG C,
Hot arc temperature is controlled at 1210 DEG C, and the heating process heated in total 180 minutes guarantees the uniform diffusion of steel；
(8) stacking slow cooling: stacking slow cooling mode is concentrated using 370 DEG C of lees after steel rolling, is further removed
Stress；
(9) be heat-treated: use 900 DEG C of heating and thermal insulations, after the quick bright quenching oil hardening of LT18A, using 500 DEG C with
600 DEG C of two limiting temperatures tempering.
Round steel (JNCGQLS) performance manufactured in the present embodiment is as follows:
Embodiment 3
With the Φ 38mm stocking that 150mm × 150mm section rectangular billet CC produces, performance entirely reaches technical requirements.Tool
Body technology method is as follows:
(1) it is smelted using ultra high power eccentric-bottom type electric furnace: electric furnace smelting mistake using molten iron and steel scrap as raw material
Molten iron+steel scrap raw material proportioning in journey using 70% gropes to carry out electric furnace smelting, and tapping controls C content wt >=0.06%, out
Steel P content wt≤0.010%；Add 1.0~1.5kg/t of SiCaBaAl, 1.5~2.5kg/t of steel-core-aluminium strong when 15~20t of tapping
Deoxidation, iron alloy material, carburant, slag charge be then added packet in, tapping the later period use argon gas strong mixing, with uniform temperature and at
Point, and deoxidation products is promoted to float；
(2) material is refined using LF refining furnace；Refining furnace calcium carbide early period and silicon carbide diffusive deoxidation, as early as possible shape
At white slag is stablized, the dual alkalinity R control of white slag is 6.0, and Design of Chemical Composition target: C, Si, Mn, Cr, Mo, V content wt divide
Not An 0.39~0.43%, 0.23~0.27%, 0.60~0.65%, 1.00~1.05%, 0.53~0.55%, 0.27~
The control of 0.30% target value；P, S content wt :≤0.015%；Al content wt :≤0.015%；LF refining finishing slag dual alkalinity R2
It is 5.0, the chemical composition wt% of LF refining finishing slag are as follows: CaO 50~65%, SiO27~15%, MgO 0.4~1.2%,
Al2O325~30%, S 0.3~0.5%, FeO≤0.50%；Final melting finished product ingredient controls situation respectively is:
(3) deaerated using VD vacuum drying oven, and feed core-spun yarn: kept in the case where 1670 DEG C, vacuum degree are less than 67Pa 15min with
Upper progress VD Fruit storage, after treatment feed 2.5m/t steel CaSi core-spun yarn, the soft stirring 25min of argon gas before bull ladle.
(4) carry out continuous casting processing using circular-arc type continuous casting machine: big packet long nozzle uses Ar seal apparatus, blows big Baogang stream whole process
Argon protection, the degree of superheat select carbon mould flux in 150mm × 150mm rectangular bloom, pulling rate 1.65m/min, conticaster at 45 DEG C
Using M-EMS 3Hz/480A；
(5) steel rolling: steel rolling uses 150mm × 150mm square type base combined type phosphorus removing method, using 22MPa high-pressure water descaling,
It is aided with installation cuneate lespedeza de-scaling device on rollgang；
(6) cogging, steel rolling using 150mm × 150mm square type base as raw material base, using Φ 550mm blooming mill production 88 ×
After the intermediate square billet of 88mm, it is rolled into Φ 31~Φ 38mm steel；
(7) pusher-type furnace carry out heating steel billet: heating steel billet use long-time elevated heating processes, 150mm ×
150mm uses pusher-type furnace, using I section of temperature control of heating at 950 DEG C, heats II section of temperature control at 1240 DEG C,
Hot arc temperature is controlled at 1220 DEG C, and the heating process heated in total 200 minutes guarantees the uniform diffusion of steel；
(8) stacking slow cooling: stacking slow cooling mode is concentrated using 400 DEG C of lees after steel rolling, is further removed
Stress；
(9) be heat-treated: use 900 DEG C of heating and thermal insulations, after the quick bright quenching oil hardening of LT18A, using 500 DEG C with
600 DEG C of two limiting temperatures tempering.
Round steel (JNCGQLS) performance manufactured in the present embodiment is as follows:
After existing 42CrMoA steel is heat-treated, performance indicator is as follows:
From above-mentioned data can be seen that timely 42CrMoA tempering temperature be reduced to it is minimum, by the way of water quenching also without
Method reaches the requirement that tensile strength is greater than 1400MPa.
Contrast product chemical component
It can see by the metallographic structure of Fig. 1-Fig. 4, the tissue of JNCGQLS is tiny compared with 42CrMoA, and product is strong thus
Degree and toughness are better than 42CrMoA.
It should be appreciated that the purposes of these embodiments is merely to illustrate the present invention and is not intended to limit protection model of the invention
It encloses.In addition, it should also be understood that, after reading the technical contents of the present invention, those skilled in the art can make the present invention each
Kind change, modification and/or variation, all these equivalent forms equally fall within guarantor defined by the application the appended claims
Within the scope of shield.
Claims (10)
1. a kind of superhigh intensity bolt round-bar pass method, characterized by the following steps: (1) use molten iron and give up
Steel is smelted as raw material using ultra high power eccentric-bottom type electric furnace, and (2) refine material using LF refining furnace, (3)
It is deaerated using VD vacuum drying oven, and feeds core-spun yarn, (4) carry out continuous casting processing using circular-arc type continuous casting machine, (5) steel rolling, (6) cogging,
(7) pusher-type furnace carries out heating steel billet, (8) stacking slow cooling, (9) heat treatment.
2. a kind of superhigh intensity bolt round-bar pass method as described in claim 1, it is characterised in that: the tool of step (1)
Body technology are as follows: use 50%~70% molten iron+steel scrap raw material proportioning to grope to carry out electric furnace smelting during electric furnace smelting, out
Steel controls C content wt >=0.06%, P content wt≤0.010% of tapping；Add SiCaBaAl 1.0kg/t, steel when 15~20t of tapping
The strong deoxidation of core aluminium 2.0kg/t, iron alloy material, (phosphorus content > 90wt%'s) carburant, slag charge are then added in packet, tap the later period
Argon gas strong mixing is carried out using 0.3~0.4MPa, with uniform temperature and ingredient, and deoxidation products is promoted to float.
3. a kind of superhigh intensity bolt round-bar pass method as described in claim 1, it is characterised in that: the tool of step (2)
Body technology are as follows: refining furnace calcium carbide early period and silicon carbide diffusive deoxidation form stablize white slag as early as possible, the dual alkalinity R control of white slag
System is 4.0~6.0, and Design of Chemical Composition target: C, Si content wt press 0.39~0.43%, 0.23~0.27% lower limit control respectively
System；Mn, Cr, Mo, V content wt are controlled by 0.62%, 1.02%, 0.54%, 0.58% target value；P, S content wt :≤
0.015%；Al content wt :≤0.015%；
LF refining finishing slag dual alkalinity R2 >=4.5, the chemical composition wt% of LF refining finishing slag are as follows: CaO 50~65%, SiO27~
15%, MgO 0.4~1.2%, Al2O325~30%, S 0.3~0.5%, FeO≤0.50%.
4. a kind of superhigh intensity bolt round-bar pass method as described in claim 1, it is characterised in that: the tool of step (3)
Body technology are as follows: 15min or more is kept to carry out VD Fruit storage, processing knot in the case where 1650 ± 10 DEG C, vacuum degree are less than 67Pa
1.5~2.5m/t steel CaSi core-spun yarn, 8~15min of the soft stirring of argon gas before bull ladle are fed after beam.
5. a kind of superhigh intensity bolt round-bar pass method as described in claim 1, it is characterised in that: the tool of step (4)
Body technology are as follows: big packet long nozzle uses Ar seal apparatus, flows whole blowing argon to big Baogang, the degree of superheat is selected at 20~45 DEG C
Carbon mould flux in 150mm × 150mm rectangular bloom, 1.50 ± 0.15m/min of pulling rate, conticaster use M-EMS
3Hz/480A。
6. a kind of superhigh intensity bolt round-bar pass method as described in claim 1, it is characterised in that: the tool of step (5)
Body technology are as follows: steel rolling is aided with using 150mm × 150mm square type base combined type phosphorus removing method using 18-22MPa high-pressure water descaling
Cuneate lespedeza de-scaling device is installed on rollgang.
7. a kind of superhigh intensity bolt round-bar pass method as described in claim 1, it is characterised in that: the tool of step (6)
Body technology are as follows: steel rolling produces the centre of 88 × 88mm using Φ 550mm blooming mill using 150mm × 150mm square type base as raw material base
After square billet, it is rolled into Φ 31~Φ 40mm steel；After the intermediate square billet for producing 68 × 68mm using Φ 550mm blooming mill, rolling
At Φ 16~Φ 30mm steel.
8. a kind of superhigh intensity bolt round-bar pass method as described in claim 1, it is characterised in that: the tool of step (7)
Body technology are as follows: heating steel billet uses long-time elevated heating processes, and 150mm × 150mm uses pusher-type furnace, using heating
I section of temperature control heats II section of temperature control at 1190-1210 DEG C, soaking section temperature is controlled in 1200- at 1050-1070 DEG C
1220 DEG C, the heating process heated in total 160 minutes guarantees the uniform diffusion of steel.
9. a kind of superhigh intensity bolt round-bar pass method as described in claim 1, it is characterised in that: the tool of step (8)
Body technology are as follows: concentrate stacking slow cooling mode using 350 DEG C of lees of > after steel rolling, further go de-stress.
10. a kind of superhigh intensity bolt round-bar pass method as described in claim 1, it is characterised in that: the tool of step (9)
Body technology are as follows: with 900 DEG C of heating and thermal insulations, after the quick bright quenching oil hardening of LT18A, using 500 DEG C and 600 DEG C of two poles
Limit temperature tempering.
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| CN113198989A (en) * | 2021-03-31 | 2021-08-03 | 邯郸钢铁集团有限责任公司 | Method for improving reduction of area of chromium-molybdenum steel high-strength bolt for automobile |
| CN114015832A (en) * | 2021-10-26 | 2022-02-08 | 山东寿光巨能特钢有限公司 | Production method of round steel for minus 40 ℃ impact-resistant high-strength bolt |
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| CN110106443B (en) | 2020-11-03 |
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