CN110079728A - A kind of good high-strength deformed steel bar muscle of weldability and its manufacturing method - Google Patents
A kind of good high-strength deformed steel bar muscle of weldability and its manufacturing method Download PDFInfo
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- CN110079728A CN110079728A CN201910279830.5A CN201910279830A CN110079728A CN 110079728 A CN110079728 A CN 110079728A CN 201910279830 A CN201910279830 A CN 201910279830A CN 110079728 A CN110079728 A CN 110079728A
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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
- 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
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
-
- 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
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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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
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
Abstract
A kind of good high-strength deformed steel bar muscle of weldability and its manufacturing method, belong to spiral production field.The mass fraction of chemical component and each chemical component that the reinforcing bar includes are as follows: C0.16~0.22%, Si0.1~0.5%, Mn1.0~1.4%, P0.01~0.035%, S0.01~0.035%, Ti0.01~0.025%, RE0.002~0.015%, O0.004~0.015%, N0.004~0.015%, surplus are Fe and inevitable impurity；Its carbon equivalent Ceq meets 0.35%≤Ceq≤0.45%.Its preparation method are as follows: smelt and continuous casting, continuous casting billet heating, hot-rolled reinforced bar, control cool down, this method is designed using low-carbon-equivalent ingredient, in conjunction with the improvement of smelting technique and rolling cooling technique, utilize the microscopic structure after Ti-RE-Mn oxysulfide refinement rolled and welding, improve reinforced steel bar strength and welding performance, alloying element addition is reduced, realizes the production of spiral low-cost and high-quality.
Description
Technical field
The invention belongs to spiral production technical field, in particular to a kind of good high-strength deformed steel bar muscle of weldability
And its manufacturing method.
Background technique
Spiral has a wide range of applications in fields such as infrastructure construction, engineering and buildings.China was at 2018 11
Come into effect new spiral standard GB/T/T 1499.2-2018 from month 1 day, to reinforcing bar production technology, metallographic structure and
Intensity rank proposes new demand.It is mainly realized by way of increase alloying element content currently, improving reinforced steel bar strength, this
The increase of reinforcing bar production cost and consuming excessively for alloy resource are caused, the sustainable development of economy and society is unfavorable for.Separately
On the one hand, in order to guarantee the service performance of reinforcing bar, it is desirable that have preferable welding performance.In this context, it is badly in need of developing
New Products & New Technology, while improving steel bar quality, realization subtracts alloy, low cost, greenization manufacture.
Patent CN102899558A discloses a kind of 500MPa grades of anti-seismic steel bar for building, using v n micro alloying, together
Shi Tigao intensity and toughness meet requirement of the Seismic Design of Building to reinforcement property.But it is required that V content reach 0.07~
0.12%, it causes V alloy resource consumption and production cost dramatically increases.
Patent CN102400044A discloses a kind of niobium-titanium composite micro-alloyed hotrolled deformed bar and its production method, adopts
Microalloy additional amount is reduced with Nb-Ti combined microalloying technique, reaches HRB400 intensity rank.Due to HRB400 rank steel
Muscle output is big, and Nb is a kind of precious alloy resource, therefore the extensive application in reinforcing bar is unfavorable for the saving of precious resource.
Patent CN107447164A discloses a kind of anti-seismic steel bar and its production technology, passes through and Ti and controlled rolling work is added
Skill reduces the additional amount of V, improves reinforced steel bar strength.The compound addition of Ti and V is unfavorable for the reduction of cost, and controlled rolling
Technique is unfavorable for the raising of production efficiency using lower rolling temperature.
Patent CN103924037A discloses a kind of HRB400 hot-rolled reinforced bar production technology, and molten steel feeds titanium nitride in refining station
Line carries out titanium microalloying processing, improves reinforced steel bar strength using the precipitation strength effect of Ti.Molten steel feeds titanium nitride Wiring technology cannot
Effective oxysulfide is obtained, intensity is improved using cooling controlling and rolling controlling process, is unfavorable for the raising of Rolling Production efficiency.
Patent CN1718770A discloses a kind of post rolling fast cooling-production technology of high strength ribbed reinforced bar, after rolling
Ultra-rapid cooling ferrite/pearlitic structrure for making the austenite structure of reinforcing bar be changed into 11-12 grades of grain size rapidly, improve
Reinforced steel bar strength.Due to requiring that reinforcing bar is cooled to 480~720 DEG C eventually in 1 second with the cooling rate greater than 700 DEG C/sec, this is right
The out tape of technology is come difficult.
From the point of view of the above-mentioned prior art, single vanadium is replaced using combined microalloying or more cheap titanium microalloying
Microalloying can reduce reinforcing bar production cost.But current high-strength hot-rolled spiral alloying component usually have compared with
High carbon equivalent, has adverse effect welding performance, and used micro-alloying technology is mostly used for improving rolled
Intensity, and it is unobvious to the improvement result of welding performance.In addition, controlled cooling technique can significantly improve steel performance, still
It also needs to combine with controlled rolling technique at present, affects Technique Popularizing application.Therefore, it is necessary to develop to improve simultaneously
Reinforced steel bar strength and welding performance simultaneously effectively can produce work in conjunction with the high-strength deformed steel bar muscle of the low-alloy cost of controlled cooling technique
Skill and product.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of good high-strength deformed steel bar muscle of weldability and its manufacturer
Method solves in the production of current reinforcing bar carbon equivalent compared with high, precious alloy additive amount is more, welding performance is bad, controlled rolling and control
The problems such as cooling technique production difficulty processed is big, in the condition for reducing carbon equivalent, reducing cost of alloy, simplifying rolling and cooling technique
Down while improving reinforced steel bar strength and welding performance.This method is designed using low-carbon-equivalent ingredient, by smelting technique and is rolled cold
But the improvement and cooperation of technique improves reinforcing bar using the microscopic structure after Ti-RE-Mn oxysulfide refinement rolled and welding
Intensity and welding performance reduce alloying element addition, realize the production of spiral low-cost and high-quality.
The present invention adopts the following technical scheme that:
A kind of good high-strength deformed steel bar muscle of weldability of the invention, it includes chemical component and each chemical component
Mass fraction are as follows: C:0.16~0.22%, Si:0.1~0.5%, Mn:1.0~1.4%, P:0.01~0.035%, S:
0.01~0.035%, Ti:0.01~0.025%, RE:0.002~0.015%, O:0.004~0.015%, N:0.004~
0.015%, surplus is Fe and inevitable impurity；
The carbon equivalent Ceq of the good high-strength deformed steel bar muscle of the weldability meets 0.35%≤Ceq≤0.45%,
In, Ceq=C+Mn/6+ (Cr+V+Mo)/5+ (Cu+Ni)/15, unit %；In formula: C, Mn, Cr, Mo, V, Ni, Cu are welding
The mass fraction of the element in the good high-strength deformed steel bar muscle of property.
In the good high-strength deformed steel bar muscle of the weldability, equivalent diameter is 0.05~2 μm, draw ratio is 1~3
The quantity of the oxysulfide of Ti-RE-Mn is 1000~3000/mm2。
The good high-strength deformed steel bar muscle of the weldability, yield strength are 400~650MPa, strong flexor ratio 1.25
~1.45, elongation after fracture is 18~35%.
The good high-strength deformed steel bar muscle of the weldability, reinforcing bar tunneling boring microscopic structure are ferritic-pearlitic group
It knits, reinforcing bar rolls state and the ferrite grain size of postwelding is graded >=10 grades.
A kind of manufacturing method of the good high-strength deformed steel bar muscle of weldability of the invention, comprising the following steps:
Step 1: smelting molten steel and continuous casting
Molten iron and/or steel scrap are smelted into molten steel, when meeting condition: temperature is 1630~1690 DEG C, carbon mass fraction
For 0.05~0.15%, oxygen mass fraction be 0.03~0.08%, sulfur nutrient is < 0.035%, phosphorus mass fraction is <
When 0.035%, silicon and manganese are added during tap 1/3~3/4, obtains water containing silico-manganese steel for tapping；
After the completion of tapping, the mass fraction of the adjustment dissolution oxygen of water containing silico-manganese steel is 0.002~0.015%, total oxygen quality point
Ti and RE is added into molten steel for number 0.01~0.05%, when steel oxygen in water mass fraction reaches 0.0001~0.002%,
Total oxygen mass fraction 0.004~0.015%, Ti mass fraction 0.01~0.025%, RE mass fraction 0.002~0.015%,
It obtains molten steel composition and field trash meets the molten steel of the good high-strength deformed steel bar muscle requirement of weldability；
While preparation meets the molten steel of the good high-strength deformed steel bar muscle requirement of weldability or later, it can be connected
Casting, obtains continuous casting billet；
Step 2: continuous casting billet heating
Continuous casting billet is heated, heating temperature is 1100~1200 DEG C, 20~100min of heating time, after obtaining heating
Continuous casting billet；
Step 3: hot-rolled reinforced bar
To after heating continuous casting billet carry out continuous rolling, 1080~1200 DEG C of start rolling temperature, finishing temperature 980~1120
DEG C, obtain hot-rolled ribbed bars；
Step 4: control cooling
Control cooling is carried out to hot-rolled ribbed bars, is cooled to 650~750 DEG C with the cooling rate acceleration of 1.5~15 DEG C/s, so
It cools down in air afterwards, obtains the good high-strength deformed steel bar muscle of weldability.
In the step 1, Ti and RE is added by the way of Ti ferroalloy and RE ferroalloy or Ti-RE ferroalloy
Mode be added.
In the step 1, Ti and RE are added by the way of alloy block or alloy claded wire.
In the step 1, in the ferroalloy total amount of the Ti and RE that are added, the mass fraction of Ti is 20~40%, RE
Mass fraction be 5~20%, Si mass fraction is 0~45%, surplus be iron and inevitable impurity.
In the step 1, the coal addition position of Ti and RE are ladle, tundish or crystallizer.
In the step 1, field trash meets the good high-strength deformed steel bar muscle requirement of weldability are as follows: weldability is good
In high-strength deformed steel bar muscle, the quantity of the oxysulfide for the Ti-RE-Mn that equivalent diameter is 0.05~2 μm, draw ratio is 1~3 is
1000~3000/mm2。
In the step 2, heating is carried out to continuous casting billet and is reheated using hot delivery and hot charging or cold base.
In the step 4, the cooling mode of the acceleration is that air cooling, air-cooled, water cooling or aerosol are cold.
In the step 4, accelerating cooling can be that cooling or intermittent acceleration is continuously accelerated to cool down, and accelerate when for interval
Cooling, cooling interval is 1~30s.
In the manufacturing method of the good high-strength deformed steel bar muscle of the weldability, during smelting molten steel, in continuous casting
Before can be refined, method of refining LF, RH or VD refining one of, 5~30min of refining time.
The design of a kind of good high-strength deformed steel bar muscle of weldability of the invention and its manufacturing method, technical solution is thought
Think are as follows:
The design philosophy of technical solution of the present invention raising reinforcement welding performance are as follows: firstly, being set using lower carbon equivalent Ceq
Meter reduces the sexual orientation of hardening of reinforcing bar in welding process, avoids welding cold cracking；Secondly, using effective field trash grain
Carefulization welds tissue, improves welding performance；Meanwhile niobium, vanadium microalloy Carbonitride Precipitation are reduced, it reduces to welding performance
Adverse effect.In terms of improving reinforced steel bar strength, since present invention employs the design of lower carbon equivalent, the solid solutions such as carbon, silicon, manganese are strong
Change constituent content is lower, and reduces the precipitation strength effect of niobium, vanadium microalloy carbonitride, and therefore, the present invention mainly adopts
Reinforced steel bar strength is improved with oxysulfide induction refined crystalline strengthening mode, at this moment should properly increase the content of oxysulfide formation element.
Common refined crystalline strengthening reinforcing bar uses low temperature rolling technique, is unfavorable for the progress of production, and the water cooling work generallyd use
Skill is easy to produce abnormal microscopic structure.The present invention is directed to the deficiency of common process, completes under the higher temperature being easily deformed
Rolling, and control cooling is implemented according to ferrite induced transformation dynamic conditions, obtain the crystal grain refinement for meeting standard requirements
Microscopic structure.
The present invention pass through the study found that controlled in the reinforcing bar composition range carbon equivalent Ceq (%) 0.35~
When 0.45, the welding performance of reinforcing bar is improved, and the Ti-RE-Mn oxysulfide of specific dimensions and quantity is distributed in steel
When, reinforcement welding performance further increases.Ti-RE-Mn oxysulfide is capable of growing up and inducing Intragranular Acicular Ferrite for pinning crystal grain
Phase transformation plays Grain Refinement Effect in the welding process.Ti-RE-Mn oxysulfide can also refine the aobvious of reinforcing bar after hot rolling simultaneously
Micro-assembly robot by pinning crystal boundary and induces transgranular phase transformation to promote fine grained texture's transformation, therefore, suitably under high temperature rolling technique
The tissue after reinforcing bar rolls state and welds and performance can be improved simultaneously by improving Ti-RE-Mn oxysulfide quantity.But present invention research
It was found that in the composition range, the formation of Ti-RE-Mn oxysulfide induction fine ferrite grain tissue in hot-rolled reinforced bar
Transition kinetics condition appropriate is needed, when using post-rolling control cooling process described in this programme, can steadily be obtained
Ferritic-pearlitic fine grained texture, avoids the appearance of abnormal structure, to meet standard requirements.
A kind of good high-strength deformed steel bar muscle of weldability of the invention and its manufacturing method, advantage and beneficial effect
It is:
1, useless field trash is transformed into beneficial structure refinement particle by ingredient and technology controlling and process by the present invention, makes to lead to
It is considered the oxygen of impurity element in normal situation, sulphur becomes the beneficial element for being conducive to steel performance raising；Reduce Nb, V element
Addition, reduce the consumption of precious alloy resource, and by add microly the Ti for having the price of abundant reserves less expensive,
RE element improves reinforcement property, reduces production cost；
2, the present invention by refined crystalline strengthening mode improves reinforced steel bar strength, than other reinforcings such as the precipitation strengths that generallys use
Mode can more improve the comprehensive performance of steel；The present invention can significantly improve welding performance while improving reinforced steel bar strength, can
Meet different welding methods, the service performance of product is improved；
3, the present invention does not use low temperature rolling, and preferential recommendation uses high temperature rolling, simplifies reinforcing bar rolling work
Skill reduces production operation difficulty, improves production efficiency；The Controlled cooling process that the present invention uses is in conjunction with the ingredient and folder
Sundries distribution, the ferritic-pearlitic tissue of available standard requirements avoid the generation of abnormal structure, and can effectively improve strong
Degree.
Detailed description of the invention
Fig. 1 is that the optical microstructure of the good high-strength deformed steel bar muscle of 1 weldability of the embodiment of the present invention schemes.
Fig. 2 schemes for optical microstructure after the welding of the good high-strength deformed steel bar muscle of 1 weldability of the embodiment of the present invention.
Fig. 3 is the inclusion distribution scanning electron microscope tissue of the good high-strength deformed steel bar muscle of 1 weldability of the embodiment of the present invention
Figure.
Fig. 4 is Ti-RE (Ce)-Mn oxysulfide energy of the good high-strength deformed steel bar muscle of 1 weldability of the embodiment of the present invention
Spectrum.
Specific embodiment
The specific embodiment of the present invention program is discussed in detail below by embodiment, but protection scope of the present invention not office
It is limited to embodiment.
Embodiment 1
A kind of good high-strength deformed steel bar muscle of weldability, it includes chemical component and each chemical component quality point
Number is shown in Table 1.The carbon equivalent Ceq of the good high-strength deformed steel bar muscle of the weldability is shown in Table 1.The good height of the weldability
In intensity spiral, the quantity of the oxysulfide for the Ti-RE-Mn that equivalent diameter is 0.05~2 μm, draw ratio is 1~3 is shown in Table
2。
In the present embodiment, RE uses Ce.
A kind of manufacturing method of the good high-strength deformed steel bar muscle of weldability, comprising the following steps:
Step 1: smelting molten steel and continuous casting
Molten iron is smelted into molten steel, 1635 DEG C of tapping temperature, carbon mass fraction 0.15%, oxygen mass fraction in converter
0.06%, sulfur nutrient 0.02% when phosphorus mass fraction is 0.03%, is added silicomanganese, obtains during tapping 1/3~3/4
Water containing silico-manganese steel；Water constituent containing silico-manganese steel is adjusted after tapping；When water containing silico-manganese steel reaches dissolved oxygen mass fraction 0.003%, complete
When oxygen mass fraction 0.03%, ferro-titanium block and cerium-iron alloy block is added, further adjusts molten steel dissolved oxygen mass fraction
0.002%, total oxygen mass fraction 0.012%, Ti mass fraction 0.016%, Ce mass fraction 0.005% obtain molten steel composition
Meet the molten steel of the good high-strength deformed steel bar muscle requirement of weldability with field trash；The good high-intensitive screw thread of weldability will be met
The molten steel continuous casting that reinforcing bar requires obtains continuous casting billet；
Step 2: continuous casting billet heating
Continuous casting billet is heated to 1200 DEG C, heating time 25min using hot delivery and hot charging, the continuous casting billet after being heated；
Step 3: hot-rolled reinforced bar
To after heating continuous casting billet carry out continuous rolling, 1180 DEG C of start rolling temperature, 1120 DEG C of finishing temperature, bar diameter
28mm obtains hot-rolled ribbed bars；
Step 4: control cooling
700 DEG C are cooled to using water-cooling pattern to hot-rolled ribbed bars, average 12 DEG C/s of cooling rate is then cold in air
But, the good high-strength deformed steel bar muscle of 1 weldability of embodiment is obtained.
Optical microstructure's figure of the good high-strength deformed steel bar muscle of weldability manufactured in the present embodiment is shown in Fig. 1, welding
Optical microstructure's figure is shown in that Fig. 2, inclusion distribution scanning electron microscope organization chart are shown in Fig. 3, the good high-intensitive screw thread of weldability afterwards
Ti-RE (Ce)-Mn oxysulfide power spectrum of reinforcing bar is shown in Fig. 4, it can be seen from the figure that Ti-RE-Mn oxysulfide Dispersed precipitate in
In rebar matrix, it is capable of growing up and inducing Intragranular Acicular Ferrite phase transformation for pinning crystal grain, rebar matrix obtains fine grain ferrite pearl
Body of light tissue improves reinforced steel bar strength, and fine grained texture is obtained after welding, improves reinforcement welding performance.
Embodiment 2
A kind of good high-strength deformed steel bar muscle of weldability, it includes chemical component and each chemical component quality point
Number is shown in Table 1.The carbon equivalent Ceq of the good high-strength deformed steel bar muscle of the weldability is shown in Table 1.The good height of the weldability
In intensity spiral, the quantity of the oxysulfide for the Ti-RE-Mn that equivalent diameter is 0.05~2 μm, draw ratio is 1~3 is shown in Table
2。
In the present embodiment, RE uses Y.
A kind of manufacturing method of the good high-strength deformed steel bar muscle of weldability, comprising the following steps:
Step 1: smelting molten steel and continuous casting
Molten iron and steel scrap (mass ratio, molten iron: steel scrap 4:1) are smelted into molten steel in converter, 1670 DEG C of tapping temperature,
Carbon mass fraction 0.08%, oxygen mass fraction 0.06%, sulfur nutrient 0.03%, when phosphorus mass fraction is 0.02%, tapping
Silicomanganese is added during 1/3~3/4, obtains water containing silico-manganese steel；Water constituent containing silico-manganese steel is adjusted after tapping；When water containing silico-manganese steel reaches
When to dissolved oxygen mass fraction 0.002%, total oxygen mass fraction 0.02%, ferrotianium core-spun yarn and yttrium iron alloy claded wire is added,
Molten steel titanium mass fraction is further adjusted to 0.012%, dissolved oxygen mass fraction 0.001%, total oxygen mass fraction 0.006%, Y
Mass fraction 0.002%, obtains ingredient and field trash meets the molten steel of the good high-strength deformed steel bar muscle requirement of weldability；It will expire
The molten steel continuous casting that the sufficient good high-strength deformed steel bar muscle of weldability requires obtains continuous casting billet；
Step 2: continuous casting billet heating
Continuous casting billet is heated to 1200 DEG C, heating time 30min using cold base, the continuous casting billet after being heated；
Step 3: hot-rolled reinforced bar
To after heating continuous casting billet carry out continuous rolling, 1120 DEG C of start rolling temperature, 1050 DEG C of finishing temperature, bar diameter
20mm obtains hot-rolled ribbed bars；
Step 4: control cooling
680 DEG C are cooled to using air cooling way to hot-rolled ribbed bars, then average 5 DEG C/s of cooling rate is cooled down in air,
Obtain the good high-strength deformed steel bar muscle of 2 weldability of embodiment.
Embodiment 3
A kind of good high-strength deformed steel bar muscle of weldability, it includes chemical component and each chemical component quality point
Number is shown in Table 1.The carbon equivalent Ceq of the good high-strength deformed steel bar muscle of the weldability is shown in Table 1.The good height of the weldability
In intensity spiral, the quantity of the oxysulfide for the Ti-RE-Mn that equivalent diameter is 0.05~2 μm, draw ratio is 1~3 is shown in Table
2。
In the present embodiment, RE uses Ce.
A kind of manufacturing method of the good high-strength deformed steel bar muscle of weldability, comprising the following steps:
Step 1: smelting molten steel and continuous casting
Molten iron and steel scrap (are smelted into molten steel, 1650 DEG C of tapping temperature, carbonaceous amount point in mass ratio for 3:1) in converter
Number 0.1%, oxygen mass fraction 0.05%, sulfur nutrient 0.03%, when phosphorus mass fraction is 0.02%, 1/3~3/4 mistake of tapping
Silicomanganese is added in journey, obtains water containing silico-manganese steel；
Water constituent containing silico-manganese steel is adjusted after tapping；Carry out LF refining 20min；Molten steel reaches dissolved oxygen mass fraction
0.002%, titanium cerium-iron alloy core-spun yarn is added when total oxygen mass fraction 0.01%, further adjusts molten steel titanium mass fraction extremely
0.01%, dissolved oxygen mass fraction 0.001%, total oxygen mass fraction 0.005%, Ce mass fraction 0.004%, obtain ingredient and
Field trash meets the molten steel of the good high-strength deformed steel bar muscle requirement of weldability；The good high-strength deformed steel bar of weldability will be met
The molten steel continuous casting that muscle requires obtains continuous casting billet；In the titanium cerium-iron alloy core-spun yarn of addition, titanium mass fraction is 25%, cerium quality point
Number is 8%, Si mass fraction is 12%, and surplus is iron and inevitable impurity.
Step 2: continuous casting billet heating
Continuous casting billet is heated to 1150 DEG C, heating time 100min using cold base, the continuous casting billet after being heated；
Step 3: hot-rolled reinforced bar
To after heating continuous casting billet carry out continuous rolling, 1120 DEG C of start rolling temperature, 1050 DEG C of finishing temperature, bar diameter
36mm obtains hot-rolled ribbed bars；
Step 4: control cooling
670 DEG C are cooled to using water mist to hot-rolled ribbed bars, then average 10 DEG C/s of cooling rate is cooled down in air, obtained
To the good high-strength deformed steel bar muscle of 3 weldability of embodiment.
Embodiment 4
A kind of good high-strength deformed steel bar muscle of weldability, it includes chemical component and each chemical component quality point
Number is shown in Table 1.The carbon equivalent Ceq of the good high-strength deformed steel bar muscle of the weldability is shown in Table 1.The good height of the weldability
In intensity spiral, the quantity of the oxysulfide for the Ti-RE-Mn that equivalent diameter is 0.05~2 μm, draw ratio is 1~3 is shown in Table
2。
In the present embodiment, RE uses La.
A kind of manufacturing method of the good high-strength deformed steel bar muscle of weldability, comprising the following steps:
Step 1: smelting molten steel and continuous casting
Steel scrap is smelted into molten steel, 1660 DEG C of tapping temperature, carbon mass fraction 0.12%, oxygen mass fraction in electric furnace
0.04%, sulfur nutrient 0.02% when phosphorus mass fraction is 0.01%, is added silicomanganese, obtains during tapping 1/3~3/4
Water containing silico-manganese steel；Water constituent containing silico-manganese steel is adjusted after tapping；When water containing silico-manganese steel reaches dissolved oxygen mass fraction 0.002%, complete
It carries out continuous casting after oxygen mass fraction 0.025%, feeds titaniferous 24wt.%, the 8wt.% containing lanthanum in continuous casting process into tundish
Titanium lanthanum iron core-spun yarn, makes molten steel titanium mass fraction 0.017%, lanthanum mass fraction 0.012%, dissolved oxygen mass fraction
0.002%, total oxygen mass fraction 0.008%, obtain after continuous casting meeting the good high-strength deformed steel bar muscle of the weldability at
Divide the continuous casting billet required with field trash；
Step 2: continuous casting billet heating
Continuous casting billet is heated to 1160 DEG C, heating time 60min using hot delivery and hot charging, the continuous casting billet after being heated；
Step 3: hot-rolled reinforced bar
To after heating continuous casting billet carry out continuous rolling, 1120 DEG C of start rolling temperature, 1050 DEG C of finishing temperature, bar diameter
32mm obtains hot-rolled ribbed bars；
Step 4: control cooling
750 DEG C are cooled to using water-cooling pattern to hot-rolled ribbed bars, then average 8 DEG C/s of cooling rate is cooled down in air,
Obtain the good high-strength deformed steel bar muscle of 4 weldability of embodiment.
Embodiment 5
A kind of good high-strength deformed steel bar muscle of weldability, it includes chemical component and each chemical component quality point
Number is shown in Table 1.The carbon equivalent Ceq of the good high-strength deformed steel bar muscle of the weldability is shown in Table 1.The good height of the weldability
In intensity spiral, the quantity of the oxysulfide for the Ti-RE-Mn that equivalent diameter is 0.05~2 μm, draw ratio is 1~3 is shown in Table
2。
In the present embodiment, RE uses Ce.
A kind of manufacturing method of the good high-strength deformed steel bar muscle of weldability, comprising the following steps:
Step 1: smelting molten steel and continuous casting
Molten iron and steel scrap (mass ratio, molten iron: steel scrap 4:1) are smelted into molten steel in converter, 1670 DEG C of tapping temperature,
Carbon mass fraction 0.08%, oxygen mass fraction 0.06%, sulfur nutrient 0.034%, when phosphorus mass fraction is 0.03%, tapping
Silicomanganese is added during 1/3~3/4, obtains water containing silico-manganese steel；Water constituent containing silico-manganese steel is adjusted after tapping；Molten steel reaches dissolved oxygen
Continuous casting is carried out after mass fraction 0.002%, total oxygen mass fraction 0.015%, and titaniferous is fed into crystallizer in continuous casting process
The titanium ferrocerium core-spun yarn of 30wt.%, the 10wt.% containing cerium, make molten steel titanium mass fraction 0.024%, rare earth element mass fraction
0.005%, dissolved oxygen mass fraction 0.001%, total oxygen mass fraction 0.009% obtain after continuous casting meeting the weldability good
The continuous casting billet that the ingredient and field trash of good high-strength deformed steel bar muscle require；
Step 2: continuous casting billet heating
Continuous casting billet is heated to 1200 DEG C, heating time 30min using hot delivery and hot charging, the continuous casting billet after being heated；
Step 3: hot-rolled reinforced bar
To after heating continuous casting billet carry out continuous rolling, 1170 DEG C of start rolling temperature, 1100 DEG C of finishing temperature, bar diameter
18mm obtains hot-rolled ribbed bars；
Step 4: control cooling
720 DEG C are cooled to using batch water-cooling mode to hot-rolled ribbed bars, average 5 DEG C/s of cooling rate, then in air
Middle cooling obtains the good high-strength deformed steel bar muscle of 5 weldability of embodiment.
The chemical component and inclusion characteristic of the various embodiments described above reinforcing bar are as shown in Table 1 and Table 2, the power of each embodiment reinforcing bar
It is as shown in table 3 to learn performance.
The chemical component (mass fraction, %) of each embodiment reinforcing bar of table 1
| Embodiment | C | Si | Mn | P | S | Ti | RE | O | N | Ceq (%) |
| 1 | 0.16 | 0.15 | 1.28 | 0.03 | 0.02 | 0.016 | 0.005 | 0.012 | 0.005 | 0.37 |
| 2 | 0.20 | 0.32 | 1.36 | 0.02 | 0.03 | 0.012 | 0.002 | 0.006 | 0.006 | 0.43 |
| 3 | 0.22 | 0.50 | 1.40 | 0.02 | 0.03 | 0.010 | 0.004 | 0.005 | 0.012 | 0.45 |
| 4 | 0.19 | 0.36 | 1.22 | 0.01 | 0.02 | 0.017 | 0.012 | 0.008 | 0.011 | 0.39 |
| 5 | 0.20 | 0.34 | 1.16 | 0.03 | 0.01 | 0.024 | 0.005 | 0.009 | 0.007 | 0.39 |
Inclusion characteristic in each embodiment reinforcing bar of table 2
The mechanical property of each embodiment reinforcing bar of table 3
| Embodiment | Yield strength/MPa | Tensile strength/MPa | Elongation after fracture/% | Maximum, force breaking elongation/% | Strong flexor ratio |
| 1 | 445 | 615 | 28 | 13.3 | 1.38 |
| 2 | 550 | 740 | 22 | 11.5 | 1.35 |
| 3 | 640 | 810 | 21 | 11.2 | 1.26 |
| 4 | 540 | 720 | 24 | 12.4 | 1.33 |
| 5 | 565 | 705 | 21 | 12.1 | 1.25 |
。
Claims (11)
1. a kind of good high-strength deformed steel bar muscle of weldability, which is characterized in that the good high-strength deformed steel bar muscle of the weldability
The mass fraction of the chemical component and each chemical component that include are as follows: C:0.16~0.22%, Si:0.1~0.5%, Mn:1.0
~1.4%, P:0.01~0.035%, S:0.01~0.035%, Ti:0.01~0.025%, RE:0.002~0.015%, O:
0.004~0.015%, N:0.004~0.015%, surplus are Fe and inevitable impurity；
The carbon equivalent Ceq of the good high-strength deformed steel bar muscle of the weldability meets 0.35%≤Ceq≤0.45%, wherein
Ceq=C+Mn/6+ (Cr+V+Mo)/5+ (Cu+Ni)/15, unit %；In formula: C, Mn, Cr, Mo, V, Ni, Cu are that weldability is good
The mass fraction of the element in good high-strength deformed steel bar muscle.
2. the good high-strength deformed steel bar muscle of weldability as described in claim 1, which is characterized in that the weldability is good
High-strength deformed steel bar muscle in, the quantity of the oxysulfide for the Ti-RE-Mn that equivalent diameter is 0.05~2 μm, draw ratio is 1~3
For 1000~3000/mm2。
3. the good high-strength deformed steel bar muscle of weldability as described in claim 1, which is characterized in that the weldability is good
High-strength deformed steel bar muscle, yield strength be 400~650MPa, strong flexor ratio be 1.25~1.45, elongation after fracture be 18~
35%.
4. the good high-strength deformed steel bar muscle of weldability as described in claim 1, which is characterized in that the weldability is good
High-strength deformed steel bar muscle, reinforcing bar tunneling boring microscopic structure is ferritic-pearlitic tissue, and reinforcing bar rolls the ferrite of state and postwelding
Grain size is graded >=10 grades.
5. the manufacturing method of the good high-strength deformed steel bar muscle of weldability described in Claims 1 to 4 any one, feature exist
In, comprising the following steps:
Step 1: smelting molten steel and continuous casting
Molten iron and/or steel scrap are smelted into molten steel, when meeting condition: temperature is 1630~1690 DEG C, carbon mass fraction is
0.05~0.15%, oxygen mass fraction is 0.03~0.08%, sulfur nutrient is < 0.035%, phosphorus mass fraction is <
When 0.035%, silicon and manganese are added during tap 1/3~3/4, obtains water containing silico-manganese steel for tapping；
After the completion of tapping, the mass fraction of the adjustment dissolution oxygen of water containing silico-manganese steel is 0.002~0.015%, total oxygen mass fraction
0.01~0.05%, Ti and RE is added into molten steel, when steel oxygen in water mass fraction reaches 0.0001~0.002%, complete
Oxygen mass fraction 0.004~0.015%, Ti mass fraction 0.01~0.025%, RE mass fraction 0.002~0.015% obtain
Meet the molten steel of the good high-strength deformed steel bar muscle requirement of weldability to molten steel composition and field trash；
By while preparation meets the molten steel of the good high-strength deformed steel bar muscle requirement of weldability or later, continuous casting is carried out, is obtained
To continuous casting billet；
Step 2: continuous casting billet heating
Continuous casting billet is heated, heating temperature is 1100~1200 DEG C, 20~100min of heating time, the company after being heated
Slab；
Step 3: hot-rolled reinforced bar
Continuous rolling is carried out to the continuous casting billet after heating, 1080~1200 DEG C of start rolling temperature, 980~1120 DEG C of finishing temperature, is obtained
To hot-rolled ribbed bars；
Step 4: control cooling
Control cooling is carried out to hot-rolled ribbed bars, 650~750 DEG C is cooled to the cooling rate acceleration of 1.5~15 DEG C/s, then exists
It is cooling in air, obtain the good high-strength deformed steel bar muscle of weldability.
6. the manufacturing method of the good high-strength deformed steel bar muscle of weldability as claimed in claim 5, which is characterized in that described
In step 1, Ti and RE is added by the way of Ti ferroalloy and RE ferroalloy or the mode of Ti-RE ferroalloy is added；Ti and
RE is added by the way of alloy block or alloy claded wire；In the ferroalloy total amount of the Ti and RE that are added, the mass fraction of Ti
Mass fraction for 20~40%, RE is 5~20%, Si mass fraction is 0~45%, surplus be iron and inevitably it is miscellaneous
Matter.
7. the manufacturing method of the good high-strength deformed steel bar muscle of weldability as claimed in claim 5, which is characterized in that Ti and RE
Coal addition position be ladle, tundish or crystallizer.
8. the manufacturing method of the good high-strength deformed steel bar muscle of weldability as claimed in claim 5, which is characterized in that described
In step 1, field trash meets the good high-strength deformed steel bar muscle requirement of weldability are as follows: the good high-strength deformed steel bar muscle of weldability
In, the quantity of the oxysulfide for the Ti-RE-Mn that equivalent diameter is 0.05~2 μm, draw ratio is 1~3 is 1000~3000/
mm2。
9. the manufacturing method of the good high-strength deformed steel bar muscle of weldability as claimed in claim 5, which is characterized in that described
In step 2, heating is carried out to continuous casting billet and is reheated using hot delivery and hot charging or cold base.
10. the manufacturing method of the good high-strength deformed steel bar muscle of weldability as claimed in claim 5, which is characterized in that described
Step 4 in, the cooling mode of the described acceleration is that air cooling, air-cooled, water cooling or aerosol are cold；Acceleration is cooled to continuously accelerate cooling
Or intermittent acceleration cooling, when accelerating cooling for interval, cooling interval is 1~30s.
11. the manufacturing method of the good high-strength deformed steel bar muscle of weldability as claimed in claim 5, which is characterized in that described
The good high-strength deformed steel bar muscle of weldability manufacturing method in, during smelting molten steel, refined before continuous casting, essence
Smelting method is one of LF, RH or VD refining, 5~30min of refining time.
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| PCT/CN2019/084053 WO2020206744A1 (en) | 2019-04-09 | 2019-04-24 | High-strength ribbed reinforcing bar having good weldability, and manufacturing method therefor |
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| WO2020206744A1 (en) | 2020-10-15 |
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