CN106521349B - A kind of economical high-strength finish rolling deformed bar and production method - Google Patents
A kind of economical high-strength finish rolling deformed bar and production method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- 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
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Abstract
A kind of economical high-strength finish rolling deformed bar and its production method.The ingredient of steel alloy is in percentage by weight：C：0.37%~0.45%, Si：1.6%~2.2%, Mn：0.6~0.9%, Cr：0.3%~0.6%, Mo：0.1%~0.5%, B：0.0005%~0.0015%, P<0.035%, S<0.035%；On the basis of above-mentioned basis, while adding Nb：0.01%~0.055%, V：0.02%~0.15%, Ti：One or more of 0.001%~0.05% is used as microalloy element；Surplus is Fe and inevitable impurity element；Using above-mentioned steel alloy by rolling rear air-cooled acquisition diameter>50mm PSB930 rank finish rolling deformed bars；Diameter is obtained by being heat-treated after rolling using above-mentioned steel alloy>50mm PSB1080 rank finish rolling deformed bars；The present invention ensure that refinement and the homogenization of steel whole cross section microstructure, toughness plasticity improved while ensureing the intensity of finish rolling deformed bar, have good mechanical property by establishing new alloy system and heat treatment process.
Description
Technical field
The invention belongs to finish rolling deformed bar technical fields, are specifically related to the economical and its high intensity (PSB930 of one kind
Rank and PSB1080 ranks；Diameter>50mm) the production method and finish rolling deformed bar of finish rolling deformed bar.
Background technology
Spiral for prestressed concrete is widely used in large-scale water conservancy work as an important kind of construction(al)steel
Continuous beam in journey, industry and civil buildings and large-scale frame structure, highway, railway big-and-middle bridge beam, nuclear power station and earth anchor etc.
Engineering.It has connection, anchoring easy, and adhesion strength is strong, and stretch-draw anchor is safe and reliable, it is easy for construction the advantages that, and save steel
Muscle reduces component area and weight.In addition to GB/T 20065-2006《Spiral for prestressed concrete》Specified in finish rolling
Outside nominal diameter 18mm~50mm of spiral, the fining twisted steel of a diameter of 63.5mm and 75mm has also been produced in the current country
Muscle, but both super large-scale steel are because production difficulty directly affects greatly its performance, yield and engineer application.Therefore in order to
Meet the needs of China's architectural engineering is to super-large diameter finish rolling deformed bar, an urgent demand under the conditions of existing production equipment,
Develop a kind of new super-large diameter finish rolling deformed bar kind：Proof strength and plasticity simultaneously.
At present production super large-scale (>Φ 50mm) on high intensity (yield strength >=930MPa) finish rolling deformed bar, at
Divide and production technology cost height, control difficulty are big, unstable product quality limits China's large-size high-strength finish rolling reinforcing bar
Development, therefore there is an urgent need for finding more economical ingredient and controllable production technology, ensure high strength and large specification finish rolling deformed bar
The market demand.In terms of the production of high-strength finish rolling deformed bar, current technology route includes mainly：
(1) online Heat Treatment technique improves the intensity of finish rolling deformed bar；
(2) alloying elements such as Cr, Mo are added in medium carbon steel, obtaining abnormal bainite tissue by temper improves by force
Degree；
(3) elements are air-cooled by adding B etc. in mild steel obtains bainite structure；
(4) coordinate tempering heat treatment process by carrying high Mn content, improve intensity；
(4) Cr, Mo, Ni, B is added simultaneously in mild steel, adds microalloy element Nb, V, Ti, improved by being heat-treated
Toughness is improved while intensity.
In the aspect of performance for improving finish rolling deformed bar, domestic patented technology is as follows:
CN1103673A discloses a kind of air-cooled transformed and treatment process, ingredient C%0.28
~0.36, Mn%0.80~1.20, Cr%0.70~1.10, Si%0.60~1.20, Mo%0.20~0.40, V%0.10~
0.15, remaining is Fe, and limitation S, P content are respectively smaller than 0.03%；Finishing temperature control at 880~900 DEG C, waste heat 200~
300 DEG C of sections are air-cooled after being tempered 2~3 hours, are organized as abnormal bainite.Although the material intensity produced using the Composition And Process
It is higher, but big specification spiral cannot be produced.
CN104018059A discloses the bainite finish rolling deformed bar of yield strength >=930MPa, ingredient：C0.10~
0.20%, Si0.20~0.50%, Mn1.80~2.3%, P≤0.035%, S≤0.035%, B0.0010~0.0030%,
Metallographic structure is mainly other entity；Production stage：It is conventional to smelt and strand, it is cooling and to room temperature that stacking is carried out to strand；To casting
Base heating, roughing, finish rolling, natural air cooling to room temperature and alternative.Although this technique improves intensity using tissue inter-variable, without into
Row heat treatment, cost reduction, but this method can only produce the following specification finish rolling deformed bar products of Φ 50mm.
CN104046907A discloses a kind of yield strength >=960MPa finish rolling deformed bars, and ingredient is 0.235~
0.33%, Si0.45~0.7%, Mn2.2~2.4%, P≤0.025%, S≤0.025%, Cr0.1~0.3%, Ti0.015
~0.03%, V0.04~0.06%, Als0.006~0.01%, natural air cooling, tissue predominantly bainite, yield strength >=
960MPa, but Mn contents are high, are susceptible to segregation, is susceptible to coarse martensite in tissue, and production product specification≤
50mm。
CN104212961A discloses the temper tempering heat treatment method of the high-strength finish rolling deformed bar of Mn systems, the chemical composition of reinforcing bar
For：C 0.27~0.31, Si 0.70~1.00%, Mn 2.20~2.70%, P≤0.035%, S≤0.035%, V0.040
~0.080%, Cr 0.03~1.00%, Ti 0.01~0.03%, remaining is Fe and inevitable impurity, passes through 3~6
Hour is warming up to 200~600 DEG C, keeps the temperature 3~6 hours, and furnace cooling obtains PSB830, PSB930, PSB1080 grades of fining twisted steels
Muscle, shortcoming：Heat treatment time is too long, results in waste of resources, and a large amount of Mn is added in steel and be easy to cause microstructure segregation, only
It can not be improved completely by temper, can not ensure the toughness plasticity of material, therefore this method can only produce small dimension, big specification
The structural homogenity of total cross-section is cannot be satisfied, ensures toughness plasticity.
CN201510920984.X is disclosed, ingredient C：0.21%~0.26%, Si：1.5%~2.0%, Mn：1.2~
1.8%, Cr：1.2%~1.8%, Ni：0.1%~0.4%, Mo：0.15%~0.4%, B：0.0005%~0.003%, P<
0.035%, S<0.035%；On the basis of above-mentioned basis, while adding Nb：0.01%~0.055%, V：0.02%
~0.10%, Ti：One or more of 0.001%~0.05% is used as microalloy element；Pass through quenching and tempering treatment technique
Produce big specification (diameter>50mm) the finish rolling deformed bar of high intensity (>=785MPa), but this method need Si, Mn to be added,
Cr, Ni content are higher, while also needing to carry out complicated heat treatment process, of high cost.
Invention content
In order to solve the above-mentioned technical problem, while cost is reduced, the bright purpose of we is to provide a kind of economical high intensity
Finish rolling deformed bar (diameter>Φ 50mm, high intensity PSB930, PSB1080 rank) production method and finish rolling deformed bar.
Technical scheme is as follows：
A kind of steel alloy, the steel alloy include following component by weight percentage：C：0.37%~0.45%,
Si：1.6%~2.2%, Mn：0.6~0.9%, Cr：0.3%~0.6%, Mo：0.1%~0.5%, B：0.0005%~
0.0015%, P<0.035%, S<0.035%；On the basis of above-mentioned basis, while adding Nb：0.01%~
0.055%, V：0.02%~0.15%, Ti：One or more of 0.001%~0.05% is used as microalloy element；Surplus
For Fe and inevitable impurity element.
Further, the steel alloy includes following component by weight percentage：By weight percentage, C：
0.37%~0.45%, Si：1.6%~1.8%, Mn：0.75~0.85%, Cr：0.3%~0.5%, Mo：0.2%~
0.4%, B：0.0008%~0.0012%, P<0.035%, S<0.035%；On the basis of above-mentioned basis, add simultaneously
Add Nb：0.02%~0.04%, V：0.02%~0.15%, Ti：One or more of 0.01%~0.05% is used as micro- conjunction
Gold element；Surplus is Fe and inevitable impurity element.
Further, the steel alloy includes following component by weight percentage：C：0.39-0.42%, Si：
1.95%~2.0%, Mn：0.78~0.81%, Cr：0.45%~0.5%, Mo：0.35%~0.42%, B：0.0008%~
0.001%, P<0.035%, S<0.035%；On the basis of above-mentioned basis, while adding Nb：0.015%~
0.035%, V：0.09%~0.1%, Ti：One or more of 0.035%~0.04% is used as microalloy element；Surplus is
Fe and inevitable impurity element.
Further, a kind of method producing high-strength finish rolling deformed bar using above-mentioned steel alloy is provided, it is described
Spiral is PSB930 grades of finish rolling deformed bars, diameter>50mm；The production method of the finish rolling deformed bar is specifically such as
Under：First, using it is conventional smelt, be casting continuously to form 220mm × 300m rectangular billet casters, to continuous casting billet carry out stacking be cooled to room temperature；
Then PSB930 rank finish rolling deformed bars, are obtained by following technique；Concrete technology is as follows：(1) rectangular billet CC is heated,
Control heating temperature：1200~1250 DEG C；Heating time 120min~240min；(2) rolling mill practice key point：Roughing open rolling temperature
The cumulative deformation of 1050~1150 DEG C of degree, finish rolling stage is more than 63%, and finishing temperature control is at 790 DEG C~890 DEG C, sky after rolling
It is cold, spiral is made.
Further, a kind of method producing high-strength finish rolling deformed bar using above-mentioned steel alloy is provided, it is described
Spiral is PSB1080 grades of finish rolling deformed bars, diameter>50mm；The production method of the finish rolling deformed bar is specifically such as
Under：First, using it is conventional smelt, be casting continuously to form 220mm × 300m rectangular billet casters, to continuous casting billet carry out stacking be cooled to room temperature；
Then PSB1080 rank finish rolling deformed bars, are obtained by following technique；Concrete technology is as follows：(1) rectangular billet CC is added
Heat controls heating temperature：1200~1250 DEG C；Heating time 120min~240min；(2) rolling mill practice key point：Roughing is opened
1050~1150 DEG C of temperature is rolled, the cumulative deformation in finish rolling stage is more than 63%, and finishing temperature control is rolled at 790 DEG C~890 DEG C
It is air-cooled afterwards, spiral is made；(3) following heat treatment process is carried out：It quenches after 3 hours in 900~950 DEG C of warm area range inside holdings
Fire is air-cooled to room temperature after 270 DEG C~320 DEG C, tempering in 2 hours.
Further, a kind of method producing high-strength finish rolling deformed bar using above-mentioned steel alloy is provided, it is described
The production method of finish rolling deformed bar is specific as follows：First, using it is conventional smelt, be casting continuously to form 220mm × 300m rectangular billet casters,
Stacking is carried out to continuous casting billet to be cooled to room temperature；Then PSB930 rank finish rolling deformed bars, are obtained by following technique；Specific work
Skill is as follows：(1) rectangular billet CC is heated, controls heating temperature：1245℃；Heating time 180min；(2) rolling mill practice is crucial
Point：1100 DEG C of roughing start rolling temperature, the cumulative deformation 70% in finish rolling stage, finishing temperature control at 815 DEG C, roll it is rear air-cooled,
Spiral is made.
Further, a kind of method producing high-strength finish rolling deformed bar using above-mentioned steel alloy is provided, it is described
The production method of finish rolling deformed bar is specific as follows：First, using it is conventional smelt, be casting continuously to form 220mm × 300m rectangular billet casters,
Stacking is carried out to continuous casting billet to be cooled to room temperature；Then PSB1080 rank finish rolling deformed bars, are obtained by following technique；Specifically
Technique is as follows：(1) rectangular billet CC is heated, controls heating temperature：1210℃；Heating time 200min；(2) rolling mill practice closes
Key point：1125 DEG C of roughing start rolling temperature, the cumulative deformation 80% in finish rolling stage, finishing temperature control is at 800 DEG C, sky after rolling
It is cold, spiral is made；(3) following heat treatment process is carried out：It quenches after keeping the temperature 3 hours at 920 DEG C, at 300 DEG C, returns within 2 hours
Room temperature is air-cooled to after fire.
Further, fining twisted steel made from a kind of method of above-mentioned production high-strength finish rolling deformed bar is provided
Muscle.
In the steel alloy of the present invention, effect of each element in steel alloy is as follows：
C：Carbon is strong gap solution strengthening element, be improve the more economical element of the strength of materials, but cannot mainly according to
Intensity is improved by it, and when content is less than 0.37%, can not ensure the strength of materials, by adding a large amount of alloying elements, without
Ji had both been unfavorable for the forming core of bainite and had grown up, and can not ensure the toughness plasticity of material, C of the present invention when content is higher than 0.45%
It should control 0.37%~0.45%.
Si：Silicon is used typically as solution strengthening element.Silicon is often to deposit element in steel, mainly with solid solution in steel
State exists, and the silicon of solid solution will generate apparent solution strengthening effect.Si is to expand the element of ferrite area, but Si is added in steel,
Is obtained by carbide-free Bainite and plays rush for stable residual austenite in the precipitation that can kinetically postpone carbides in austenite
Into effect.Addition, which is more than 1.8% Si, can not ensure the toughness plasticity of material.Therefore, the composition range 1.6%~1.8% of Si.
Mn：Manganese is important Strengthening and Toughening element, mainly plays solution strengthening effect, in certain content range, the intensity of steel
It is improved with the increase of manganese content.Mn is combined with B, and the incubation period of high temperature transformation is made to be considerably longer than middle temperature transformation, advantageous in this way
In within the scope of wider cooling rate, complete bainite structure is obtained.The effect of manganese also landing low transformation temperature, can prevent phase
Crystal grain is grown up after change, helps to realize the refinement of bainite Effective grain size.But it is too high to work as Mn contents, is susceptible to serious inclined
Analysis, especially on big specification continuous casting billet and material, segregation is even more apparent, reacts in nonuniform organization, massive martensite occurs, because
Ranging from the 0.75~0.85% of Mn in this present invention.
P：Phosphorous segregation is in austenite grain boundary, to reduce grain-boundary strength.Therefore, P content is low as much as possible, the upper limit
It should be 0.035%.
S：Sulphur is combined to form field trash MnS with manganese.When being stretched because of rolling, under longitudinal toughness is due to the influence of MnS
Drop.Therefore, it is necessary to keep S contents low as much as possible, it is limited to 0.035% thereon.
Cr：Although reducing austenitic area element, it can postpone pro-eutectoid ferrite transformation, reduce bainite and form temperature
Degree, therefore, in order to form bainite within the scope of wider cooling rate, but the cost of Cr is higher, thus in the present invention Cr at
Divide ranging from 0.3%~0.5%
B：The boron of micro (0.001%) can exponentially increase the quenching degree of steel, and boron is as raising quenching degree, control group
The trace element for knitting structure, there play the role of in the development of bainitic steel to be very special, boron quite significantly segregation on crystal boundary show
It writes postponement ferrite and adds pearlitic transformation.Segregation of the boron on crystal boundary is to inhibiting ferritic precipitation to play prodigious effect.Add B
When less than 0.0005%, quenching degree requirement cannot be satisfied to large-diameter material, and add B ultrasound mistake in the composition range of the present invention
This effect is just saturated when 0.0015%.Therefore plus B amounts are in the range of 0.0005%~0.0015%.
Mo：Molybdenum can reduce Bs transition temperatures, and the collective effect of Mo and B can make ferrite that line be precipitated obviously to move to right, by force
Strong postponement ferritic transformation, to which complete bainite structure can be accessed within the scope of wider cooling velocity.Improve steel
In Mo contents, the intensity of steel significantly improves, and still, as Mo contents are when increasing to 0.4% or more, the toughness of steel is significantly disliked
Change.Therefore, the control of upper limit Mo contents is 0.4%.
Ti：It must be added to titanium in boron steel, nitrogen can be effectively fixed, titanium is combined with nitrogen to be play a part of to protect B.Ti, N shape
At TiN, the roughening of austenite grain when can effectively prevent to be heated at high temperature.
V：Vanadium has the function of improving intensity by precipitation strength.But it is more than 0.10% toughness plasticity to be made to deteriorate to add V.Cause
This adds the range of V to be no more than 0.10%.To obtain the effect for adequately improving intensity, the V in 0.02% is preferably added.
Nb：Micro Nb can inhibit the deformation and recrystallization behavior of high temperature austenite, improve recrystallization temperature, and expansion is non-to tie again
Crystalline region.Since Nb, B mutually promote so that compound addition ratio is individually added into Nb or B, can more play a role.Generate a large amount of disperses point
The carbonitride Nb (C, N) of the infusibility of cloth, the pinning dislocation in drawing process so that dislocation is not easy to restore and disappear, and ensures
The intensity of matrix.The compound addition of Nb and B etc., reduces the transition temperature of bainite, and further thinning microstructure improves position in matrix
Dislocation density.
The elements such as suitable Mn, Cr, B are added by using high Si in medium carbon steel in the present invention, controlled rolling technique it is same
When, according to the method for intensity rank adjusting process, a kind of high-strength alloy system of economy is developed, there is energy conservation and environmental protection instantly
Realistic meaning.The alloy system and technique ensure that refinement and the homogenization of steel whole cross section microstructure, ensure essence
While rolling the intensity of spiral, toughness plasticity is improved, that is, there is good mechanical property.Finish rolling spiral shell produced by the invention
The product specification of line reinforcing bar is Φ 63.5mm, Φ 75mm, and performance indicator is as follows：PSB930：It is more than 930MPa for yield strength, resists
Tensile strength is more than 1080MPa, and uniform elongation is more than 6%；PSB1080：It is more than 1080MPa for yield strength, tensile strength is big
In 1230MPa, uniform elongation is more than 6%.
Specific implementation mode
Production method and finish rolling with reference to specific embodiment to the steel alloy and its finish rolling deformed bar of the present invention
Spiral is described in detail, and the steel product ingredient of each embodiment is shown in Table 1.
The ingredient (weight percent, wt%) of the steel alloy of 1 each embodiment of table
| Number | C | Si | Mn | Cr | Mo | B | Nb | V | Ti | Technique |
| 1 | 0.37 | 1.7 | 0.6 | 0.5 | 0.4 | 0.0008 | 0.055 | - | 0.04 | Embodiment 1 |
| 2 | 0.42 | 1.9 | 0.8 | 0.3 | 0.5 | 0.0015 | 0.01 | - | 0.001 | Embodiment 2 |
| 3 | 0.45 | 1.6 | 0.9 | 0.6 | 0.3 | 0.0013 | 0.03 | - | 0.05 | Embodiment 3 |
| 4 | 0.43 | 2.2 | 0.6 | 0.4 | 0.2 | 0.0005 | 0.01 | - | 0.02 | Embodiment 4 |
| 5 | 0.38 | 2.0 | 0.9 | 0.5 | 0.2 | 0.0007 | - | 0.15 | 0.02 | Embodiment 5 |
| 6 | 0.45 | 1.9 | 0.6 | 0.6 | 0.3 | 0.0013 | - | 0.02 | 0.05 | Embodiment 6 |
| 7 | 0.37 | 2.0 | 0.7 | 0.4 | 0.3 | 0.0015 | - | - | 0.04 | Embodiment 7 |
| 8 | 0.39 | 1.7 | 0.8 | 0.3 | 0.5 | 0.0009 | - | - | 0.02 | Embodiment 8 |
| 9 | 0.41 | 1.7 | 0.6 | 0.5 | 0.2 | 0.0008 | - | 0.15 | - | Embodiment 9 |
| 10 | 0.44 | 1.8 | 0.7 | 0.3 | 0.4 | 0.003 | - | 0.12 | - | Embodiment 10 |
| 11 | 0.40 | 2.1 | 0.6 | 0.3 | 0.3 | 0.001 | 0.04 | - | Embodiment 11 | |
| 12 | 0.41 | 2.2 | 0.6 | 0.5 | 0.15 | 0.0015 | 0.03 | - | - | Embodiment 12 |
Remarks：Surplus is Fe and inevitable impurity element.
PSB930 grades of finish rolling deformed bar techniques are as follows：
Embodiment 1：Trade mark PSB930 format diameter Φ 75mm
The following concrete technologies of use of the material of present invention number 1：It rolls rear air-cooled.Tensile strength Rm=1130MPa, surrender
Intensity Rel=963MPa, elongation after fracture 14.0% meet PSB930 performance requirements.
Embodiment 2：Trade mark PSB930 format diameter Φ 75mm
The following concrete technologies of use of the material of present invention number 2：It rolls rear air-cooled.Tensile strength Rm=1209MPa, surrender
Intensity Rel=991MPa, elongation after fracture 11.5% meet PSB930 performance requirements.
Embodiment 3：Trade mark PSB930 format diameter Φ 63.5mm
The following concrete technologies of use of the material of present invention number 3：It rolls rear air-cooled.Tensile strength Rm=1192MPa, surrender
Intensity Rel=984MPa, elongation after fracture 13.0% meet PSB930 performance requirements.
Embodiment 4：Trade mark PSB930 format diameter Φ 63.5mm
The following concrete technologies of use of the material of present invention number 4：It rolls rear air-cooled.Tensile strength Rm=1162MPa, surrender
Intensity Rel=978MPa, elongation after fracture 12.5% meet PSB930 performance requirements.
Embodiment 5：Trade mark PSB930 format diameter Φ 63.5mm
The following concrete technologies of use of the material of present invention number 5：It rolls rear air-cooled.Tensile strength Rm=1221MPa, surrender
Intensity Rel=984MPa, elongation after fracture 11.5% meet PSB930 performance requirements.
Embodiment 6：Trade mark PSB930 format diameter Φ 75mm
The following concrete technologies of use of the material of present invention number 4：It rolls rear air-cooled.Tensile strength Rm=1136MPa, surrender
Intensity Rel=956MPa, elongation after fracture 16.0% meet PSB930 performance requirements.
PSB1080 grades of finish rolling deformed bars use following heat treatment process：
Embodiment 7：Trade mark PSB1080 format diameter Φ 63.5mm
The heat treatment method of the material of present invention number 7 uses following concrete technologies：950 DEG C of heat preservations 3 of fining twisted steel are small
When quench, 320 DEG C heat preservation 2 hours tempers.Tensile strength Rm=1280MPa, yield strength Rel=1095MPa, has no progeny and stretches
Long rate 15.0% meets PSB1080 performance requirements.
Embodiment 8：Trade mark PSB1080 format diameter Φ 75mm
The heat treatment method of the material of present invention number 8 uses following concrete technologies：950 DEG C of heat preservations 3 of fining twisted steel are small
When quench, 270 DEG C heat preservation 2 hours tempers.The high-strength finish rolling deformed bar of gained：Tensile strength Rm=1352MPa, surrender are strong
Rel=1127MPa is spent, elongation after fracture 17.5% meets PSB1080 performance requirements.
Embodiment 9：Trade mark PSB1080 format diameter Φ 63.5mm
The heat treatment method of the material of present invention number 9 uses following concrete technologies：900 DEG C of heat preservations 3 of fining twisted steel are small
When quench, 320 DEG C heat preservation 2 hours tempers.The high-strength finish rolling deformed bar of gained：Tensile strength Rm=1324MPa, surrender are strong
Rel=1102MPa is spent, elongation after fracture 15.5% meets PSB1080 performance requirements.
Embodiment 10：Trade mark PSB1080 format diameter Φ 75mm
The heat treatment method of the material of present invention number 10 uses following concrete technologies：900 DEG C of heat preservations 3 of fining twisted steel are small
When quench, 270 DEG C heat preservation 2 hours tempers.The high-strength finish rolling deformed bar of gained：Tensile strength Rm=1506MPa, surrender are strong
Rel=1303MPa is spent, elongation after fracture 11.5% meets PSB1080 performance requirements.
Embodiment 11：Trade mark PSB1080 format diameter Φ 63.5mm
The heat treatment method of the material of present invention number 11 uses following concrete technologies：920 DEG C of heat preservations 3 of fining twisted steel are small
When quench, 280 DEG C heat preservation 2 hours tempers.The high-strength finish rolling deformed bar of gained：Tensile strength Rm=1354MPa, surrender are strong
Rel=1108MPa is spent, elongation after fracture 18.0% meets PSB1080 performance requirements.
Embodiment 12：Trade mark PSB1080 format diameter Φ 75mm
The heat treatment method of the material of present invention number 12 uses following concrete technologies：915 DEG C of heat preservations 3 of fining twisted steel are small
When quench, 315 DEG C heat preservation 2 hours tempers.The high-strength finish rolling deformed bar of gained：Tensile strength Rm=1402MPa, surrender are strong
Rel=1231MPa is spent, elongation after fracture 18.5% meets PSB1080 performance requirements.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.
Claims (9)
1. a kind of method producing high-strength finish rolling deformed bar using steel alloy, the spiral is PSB930 grades of finish rolling
Spiral, diameter>50mm；It is characterized in that, the production method of the finish rolling deformed bar is specific as follows：First, it uses
Routine smelts, is casting continuously to form 220mm × 300m rectangular billet casters, and carrying out stacking to continuous casting billet is cooled to room temperature；Then, by as follows
Technique obtains PSB930 rank finish rolling deformed bars；Concrete technology is as follows：(1) rectangular billet CC is heated, controls heating temperature：
1200~1250 DEG C；Heating time 120min~240min；(2) rolling mill practice key point：Roughing start rolling temperature 1050~1150
DEG C, the cumulative deformation in finish rolling stage is more than 63%, and finishing temperature control rolls rear air-cooled, obtained screw thread at 790 DEG C~890 DEG C
Reinforcing bar；
The steel alloy includes following component by weight percentage：C：0.37%~0.45%, Si：1.6%~2.2%,
Mn：0.6~0.9%, Cr：0.3%~0.6%, Mo：0.1%~0.5%, B：0.0005%~0.0015%, P<0.035%,
S<0.035%；On the basis of mentioned component, while adding Nb：0.01%~0.055%, V：0.02%~0.15%, Ti：
One or more of 0.001%~0.05% is used as microalloy element；Surplus is Fe and inevitable impurity element.
2. the method according to claim 1 for producing high-strength finish rolling deformed bar using steel alloy, which is characterized in that institute
The steel alloy stated includes following component by weight percentage：By weight percentage, C：0.37%~0.45%, Si：1.6%
~1.8%, Mn：0.75~0.85%, Cr：0.3%~0.5%, Mo：0.2%~0.4%, B：0.0008%~0.0012%,
P<0.035%, S<0.035%；On the basis of mentioned component, while adding Nb：0.02%~0.04%, V：0.02%~
0.15%, Ti：One or more of 0.01%~0.05% is used as microalloy element；Surplus is Fe and inevitable impurity
Element.
3. the method according to claim 1 for producing high-strength finish rolling deformed bar using steel alloy, which is characterized in that institute
The steel alloy stated includes following component by weight percentage：C：0.39-0.42%, Si：1.95%~2.0%, Mn：0.78~
0.81%, Cr：0.45%~0.5%, Mo：0.35%~0.42%, B：0.0008%~0.001%, P<0.035%, S<
0.035%；On the basis of mentioned component, while adding Nb：0.015%~0.035%, V：0.09%~0.1%, Ti：
One or more of 0.035%~0.04% is used as microalloy element；Surplus is Fe and inevitable impurity element.
4. a kind of method producing high-strength finish rolling deformed bar using steel alloy, the spiral is PSB1080 grades of essences
Roll spiral, diameter>50mm；It is characterized in that, the production method of the finish rolling deformed bar is specific as follows：First, it adopts
With conventional smelting, 220mm × 300m rectangular billet casters are casting continuously to form, carrying out stacking to continuous casting billet is cooled to room temperature；Then, by such as
Lower technique obtains PSB1080 rank finish rolling deformed bars；Concrete technology is as follows：(1) rectangular billet CC is heated, control heating temperature
Degree：1200~1250 DEG C；Heating time 120min~240min；(2) rolling mill practice key point：Roughing start rolling temperature 1050~
1150 DEG C, the cumulative deformation in finish rolling stage is more than 63%, and finishing temperature control rolls rear air-cooled at 790 DEG C~890 DEG C, is made
Spiral；(3) following heat treatment process is carried out：It is quenched after 3 hours in 900~950 DEG C of warm area range inside holdings, at 270 DEG C
~320 DEG C, room temperature is air-cooled to after tempering in 2 hours；
The steel alloy includes following component by weight percentage：C：0.37%~0.45%, Si：1.6%~2.2%,
Mn：0.6~0.9%, Cr：0.3%~0.6%, Mo：0.1%~0.5%, B：0.0005%~0.0015%, P<0.035%,
S<0.035%；On the basis of mentioned component, while adding Nb：0.01%~0.055%, V：0.02%~0.15%, Ti：
One or more of 0.001%~0.05% is used as microalloy element；Surplus is Fe and inevitable impurity element.
5. the method according to claim 4 for producing high-strength finish rolling deformed bar using steel alloy, which is characterized in that institute
The steel alloy stated includes following component by weight percentage：By weight percentage, C：0.37%~0.45%, Si：1.6%
~1.8%, Mn：0.75~0.85%, Cr：0.3%~0.5%, Mo：0.2%~0.4%, B：0.0008%~0.0012%,
P<0.035%, S<0.035%；On the basis of mentioned component, while adding Nb：0.02%~0.04%, V：0.02%~
0.15%, Ti：One or more of 0.01%~0.05% is used as microalloy element；Surplus is Fe and inevitable impurity
Element.
6. the method according to claim 4 for producing high-strength finish rolling deformed bar using steel alloy, which is characterized in that institute
The steel alloy stated includes following component by weight percentage：C：0.39-0.42%, Si：1.95%~2.0%, Mn：0.78~
0.81%, Cr：0.45%~0.5%, Mo：0.35%~0.42%, B：0.0008%~0.001%, P<0.035%, S<
0.035%；On the basis of mentioned component, while adding Nb：0.015%~0.035%, V：0.09%~0.1%, Ti：
One or more of 0.035%~0.04% is used as microalloy element；Surplus is Fe and inevitable impurity element.
7. the method according to claim 1 for producing high-strength finish rolling deformed bar using steel alloy, which is characterized in that institute
The production method for the finish rolling deformed bar stated is specific as follows：First, using it is conventional smelt, be casting continuously to form 220mm × 300m rectangular blooms
Continuous casting carries out stacking to continuous casting billet and is cooled to room temperature；Then PSB930 rank finish rolling deformed bars, are obtained by following technique；
Concrete technology is as follows：(1) rectangular billet CC is heated, controls heating temperature：1245℃；Heating time 180min；(2) work is rolled
Skill key point：1100 DEG C of roughing start rolling temperature, the cumulative deformation 70% in finish rolling stage, finishing temperature control is at 815 DEG C, after rolling
It is air-cooled, spiral is made.
8. as claimed in claim 4 using the method for steel alloy production high-strength finish rolling deformed bar, which is characterized in that described
Finish rolling deformed bar production method it is specific as follows：First, using it is conventional smelt, be casting continuously to form 220mm × 300m rectangular blooms connect
Casting carries out stacking to continuous casting billet and is cooled to room temperature；Then PSB1080 rank finish rolling deformed bars, are obtained by following technique；Tool
Body technology is as follows：(1) rectangular billet CC is heated, controls heating temperature：1210℃；Heating time 200min；(2) rolling mill practice
Key point：1125 DEG C of roughing start rolling temperature, the cumulative deformation 80% in finish rolling stage, finishing temperature control is at 800 DEG C, sky after rolling
It is cold, spiral is made；(3) following heat treatment process is carried out：It quenches after keeping the temperature 3 hours at 920 DEG C, at 300 DEG C, returns within 2 hours
Room temperature is air-cooled to after fire.
9. finish rolling spiral shell made from a kind of method as described in one of claim 1-8 using production high-strength finish rolling deformed bar
Line reinforcing bar.
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| CN113388781B (en) * | 2021-05-28 | 2022-03-04 | 广西柳钢华创科技研发有限公司 | Method for producing HRB600E threaded steel bar by high-speed bar and HRB600E threaded steel bar produced by high-speed bar |
| CN115595512A (en) * | 2022-10-19 | 2023-01-13 | 舞阳钢铁有限责任公司（Cn） | High-temperature-wear-resistant steel plate and production method thereof |
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| CN1103673A (en) * | 1993-12-06 | 1995-06-14 | 辽宁工学院 | Air-cooled transformed-bainite high-strength screw-thread steel and its processing technology |
| CN1234887C (en) * | 2002-04-28 | 2006-01-04 | 鞍钢集团新钢铁有限责任公司 | Continuous induction heat treatment process for high-strength finish-rolled spiral steel bar |
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