CN107747061A - A kind of 630MPa levels high-strength tenacity hot rolled ribbed bars and its production method - Google Patents
A kind of 630MPa levels high-strength tenacity hot rolled ribbed bars and its 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
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- 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
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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Abstract
The invention discloses a kind of 630MPa levels high-strength tenacity hot rolled ribbed bars and its production method, the Ribbed Bar chemical composition composition and weight/mass percentage composition are：C：0.20~0.25%, Mn：1.50~1.60%, Si：0.60~0.75%, V：0.08~0.15%, Cr：0.30~0.35%, N：0.012~0.025%, P：0.005 0.025%, S：0.005 0.025%, remaining is Fe and inevitable impurity；Method for producing steel bar with rib includes smelting, refining, continuous casting, heating and rolling process.The present invention utilizes cheap alloying element, substitutes the expensive alloying element such as nickel, niobium, molybdenum, reduces the cost of hot rolled ribbed bars, while improve the practicality and security of building to a certain extent；Using the smelting process and rolling mill practice of simplicity, the large-scale production of low cost is advantageously implemented.
Description
Technical field
The invention belongs to metallurgical technology field, and in particular to a kind of 630MPa levels high-strength tenacity hot rolled ribbed bars and its life
Production method.
Background technology
Hot rolled ribbed bars are the maximum a kind of ferrous materials of current dosage, and it has certain ductility, and high intensity is good
Good anti-seismic performance and welding performance.The developed countries such as Europe have been widely used 500MPa level hot rolled ribbed bars, 600MPa levels
It there has also been certain application.China has newly increased 600MPa levels band rib steel in the standard GB/T 1499.2-2013 of revision
Muscle, this kind of steel have the advantages that strength grade is high, saving dosage, are particularly suitable for the high-rise and big building of span, can also solve
Certainly the problems such as " fat beams and columns ".Further carry out the R＆D work of 630MPa level hot rolled ribbed bars, for adjusting China's steel
The production capacity problem that industry falls behind, the Implement of sustainable development have important strategic importance.
The patent that Chinese Patent Application No. is 201110350194.4 discloses a kind of " high-strength hot-rolled steel of 600MPa levels aluminiferous
Muscle and its production method ", specific composition are：C：0.21~0.25%, Si：0.35~0.60%, Mn：1.35~1.55%, V：0.08
~0.12%, N：0.005~0.040%, S≤0.040%, P≤0.040%, remaining is iron and inevitable impurity.Manufacturer
Method is " to be taken in smelting process and increase vanadium, nitrogen pick-up and fixed nitrogen technique, the operation of rolling, which is taken, reduces start rolling temperature and final rolling temperature comes
Ensure the big pressure of low temperature, realize fine grain, solid solution and precipitation hardening to improve intensity ".Have the following disadvantages：1. reduce open rolling
Temperature and final rolling temperature ensure the big pressure of low temperature, realize and improve intensity, and the requirement to milling train is high, are not suitable for carrying out extensive use.
2. nitrogen content some too high, too high elongation percentage for influenceing reinforcing bar of nitrogen content so that reinforcing bar, which has, to become fragile between 0.005-0.040%
Tendency；Whole nitrogen blowing nitrogen pick-up, easily causing bubble excessively influences the quality of product.
The patent that China Patent No. is 201310444163.4 discloses " a kind of 630MPa levels high-strength hot-rolled steel bar and its life
Production. art ", specific composition are：C：0.38~0.43%, Cr：0.8~1.1%, Mn：0.75~1.0%, Mo：0.15~0.25%,
Si：0.15~0.3%, P≤0.035%, S≤0.035%S, N≤0.035%, remaining is Fe.Concrete technology is：Reinforcing bar is sent into and added
Hot stove is heated to 1000-1200 DEG C, and reinforcing bar then is cooled into 610-630 DEG C through online first refrigerating work procedure, then quenched
Quench within 12-14 seconds when the interior water of device or quenching liquid enter behavior, being then heated to 550-560 DEG C by tempering heating furnace returns
Fire, then normal temperature is cooled to by the second cooling technique.The deficiency of this technique is：1. the intensity of reinforcing bar is lifted by improving phosphorus content
Elongation percentage is have lost, and is unfavorable for welding performance.2. the Technology for Heating Processing of reinforcing bar is complicated, the cost of product is added.3. chromium
Too high levels are unfavorable to elongation percentage.4. carbon equivalent is too high, welding performance is poor, constructional difficulties.
China Patent No. be 20161086739.9 patent disclose " a kind of 630MPa high-strength hot-rolled steel bars steel and its
Preparation method ", specific composition are：C：0.22~0.28%, Si：0.40~0.80%, Mn：1.40~1.60%, Nb：0.02~
0.04%, V：0.05~0.07%, Cr：0.02~0.40%, N：0.008~0.012%, P≤0.035%, S≤0.035%, remaining is
Fe and inevitable impurity element.Specifically technique is：Smelted in converter, electric arc furnaces or other smelting furnaces；The outer ladle of stove
Ar blowing refining；140 or 150 continuous small-billet castings；Bar is rolled using thermal mechanical rolling technique；Cooling.Though this technique is simple, close
Golden composition employs expensive metallic element niobium, adds the manufacturing cost of reinforcing bar；The precipitation of niobium is by cooling velocity simultaneously
Had a great influence with hot rolling deformation rate, large gauge ribbed bar performance inconsistency is larger, and material overall performance stability is poor.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of 630MPa levels high-strength tenacity hot rolled ribbed bars；This hair simultaneously
It is bright to additionally provide a kind of production method of 630MPa levels high-strength tenacity hot rolled ribbed bars.The present invention is by the excellent of alloying component
Change and the rolling mill practice of simplicity, obtain a kind of 630MPa level high-strength tenacity reinforcing bars for being adapted to produce and apply extensively.
In order to solve the above technical problems, the present invention adopts the technical scheme that：A kind of 630MPa levels high-strength tenacity hot-rolled strip
Rib reinforcement, the Ribbed Bar chemical composition composition and its weight/mass percentage composition are：C：0.20~0.25%, Mn：1.50~
1.60%, Si：0.60~0.75%, V：0.08~0.15%, Cr：0.30~0.35%, N：0.012~0.025%, P：0.005-
0.025%, S：0.005-0.025%, remaining is Fe and inevitable impurity.
Vanadium nitrogen is than controlling 4~7 in Ribbed Bar chemical composition of the present invention；The a diameter of 10- of Ribbed Bar
32mm。
Ribbed Bar microscopic structure of the present invention is pearlite+ferrite, and grain size is 11-12 levels.
Ribbed Bar mechanical property of the present invention is：Yield strength >=630MPa, tensile strength >=760MPa, has no progeny and stretches
Long rate >=15%, strong flexor ratio >=1.25.
Present invention also offers a kind of production method of 630MPa levels high-strength tenacity hot rolled ribbed bars, the production method
Including smelting, refining, continuous casting, heating and rolling process.
Smelting procedure of the present invention, the melting progress composition coarse adjustment in converter, electric arc furnaces or other smelting furnaces.
Refining procedure of the present invention, argon gas is passed through outside ladle, refining carries out trimming, and vanadium iron is added at Argon station
And nitrogenized manganese, consider yield of alloy, its active ingredient vanadium nitrogen added is than being 3 in mass ratio:1-6:1.
Continuous casting working procedure of the present invention, baking of tundish temperature are 1050-1100 DEG C, and crystallizer is protected to arc using whole process
Shield cast；It is casting continuously to form section 150mm × 150mm small billet.
Heating process of the present invention, 1100-1200 DEG C of billet heating temperature, it is incubated 1-2h.
Rolling process of the present invention, using Bar Wire Product hot mill rolling, start rolling temperature is controlled at 1050~1150 DEG C, often
Reduction in pass is controlled 7~30%；At 850~1050 DEG C, draught per pass is controlled 10~35% for final rolling temperature control；Eventually
Temperature is rolled for 800-1000 DEG C；Room temperature is naturally cooled to after rolling on cold bed.
Effect of the trace alloying element of the present invention in steel is as follows：
Vanadium is considered as to improve one of most suitable element of low-carbon hardness of steel.First, vanadium is strong carbon compound element, prevents Ovshinsky
The effect that body crystal grain is grown up is very notable, plays a part of refined crystalline strengthening.Secondly, existence form of the vanadium in mild steel mainly has
It is dissolved state, VC, VN and V（C, N）, and the number of nitrogen content directly decides distribution of the vanadium in steel.When nitrogen content is very low, vanadium
Mainly it is solid-solubilized in steel, plays a part of solution strengthening.Appropriate nitrogen is added in steel, solid solution vanadium can be separated, shape
Into carbide or carbonitride disperse in steel, play a part of precipitation strength.And lifting of the precipitation strength for intensity is big
In solution strengthening.Nitrogen is the very strong element of solution strengthening effect, but the too high ductility that can seriously damage steel, therefore is controlled
System is suitable in below 190ppm.Vanadium nitrogen ratio is mainly fixed on a scope by the present invention so that VC, VN and V（C, N）Separate out
The relative increase of amount, and to separate out second mutually small, round, even is distributed in steel.
C, N, Si, Mn element added in steel is the element of solution strengthening common in steel.C, the effect of N solution strengthening is most
Greatly, but the increase of carbon content can cause welding performance and ductility to decline, so needing to control between 0.20~0.25%.Nitrogen
Element combination vanadium is mentioned in above-mentioned.As Si ＞ 1.1% or Mn ＞ 1.8%, the plasticity and toughness of steel will have it is larger under
Drop, does not damage its plasticity, therefore be defined to Si while it requires the lifting solution strengthening that silicon and manganese are tried one's best big：0.40~
0.95% and Mn：1.30~1.75%, it is preferred that the present invention takes Si：0.60~0.75% and Mn：1.50~1.60%.
The effect of Cr elements mainly has three：Solid solution, plays a part of solution strengthening in steel；Improve quenching degree；In iron
In carbon phase diagram S points are moved to left, obtain the alternate pearlitic structrure of more synusia, and then lift the intensity of steel.The gained reinforcing bar heart
Portion and edge are all the alternate tissue of ferrite and pearlite.
630MPa levels high-strength tenacity hot rolled ribbed bars product and method for testing performance of the present invention refer to GB/T1499.2-
2007 and GB/T 228.1-2010.
It is using beneficial effect caused by above-mentioned technical proposal：1st, the present invention is adjusted by the optimization to alloy content
Whole vanadium nitrogen ratio so that vanadium is separated out in the form of carbide, nitride, carbonitride, and the disperse of " small, round, even " will analyse in steel
The effect for going out reinforcing increases as far as possible, while adjusts the content of the elements such as C, Mn, Si, Cr so that this steel forms strong to separate out
The strengthening mechanism of master, refined crystalline strengthening and solution strengthening for auxiliary is turned to, is lifted on the premise of plasticity and welding performance is not influenceed
Yield strength.2nd, the present invention utilizes cheap alloying element, substitutes the expensive alloying element such as nickel, niobium, molybdenum, reduces hot-rolled strip
The cost of rib reinforcement.3rd, the yield strength of reinforcing bar is promoted to more than 630MPa by the present invention, greatly reduces the usage amount of reinforcing bar,
The practicality and security of building can be improved to a certain extent simultaneously.4th, the present invention is using easy smelting process and rolling work
Skill so that production is more prone to, and with more feasibility, is advantageously implemented the large-scale production of low cost.
Brief description of the drawings
Fig. 1 is the gained Ribbed Bar room temperature microstructure figure of embodiment 1；
Fig. 2 is the gained Ribbed Bar room temperature microstructure figure of embodiment 2；
Fig. 3 is the gained Ribbed Bar room temperature microstructure figure of embodiment 3；
Fig. 4 is the gained Ribbed Bar room temperature microstructure figure of embodiment 4.
Embodiment
The present invention is further detailed explanation with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
The a diameter of 16mm of the present embodiment 630MPa level high-strength tenacity hot rolled ribbed bars, the reinforcing bar chemical composition composition and its matter
Measuring percentage composition is：C：0.20%, Mn：1.51%, Si：0.70%, V：0.125%, Cr：0.30%, N：0.025%, P：0.010%, S：
0.006%, remaining is Fe and inevitable impurity；Vanadium nitrogen ratio is 5.
The present embodiment 630MPa level high-strength tenacities method for producing hot rolled ribbed include smelting, refining, continuous casting, heating and
Rolling process, concrete technology step are as described below：
（1）Smelting procedure：Melting carries out composition coarse adjustment in converter；
（2）Refining procedure：Argon gas is passed through outside ladle, refining carries out trimming, effective vanadium nitrogen mass ratio 4 is pressed at Argon station:1
Add vanadium iron and nitrogenized manganese；
（3）Continuous casting working procedure：Baking of tundish temperature is 1060 DEG C, and crystallizer is poured into a mould using whole process protection arc；It is casting continuously to form section
150mm × 150mm small billet；
（4）Heating process：1150 DEG C of billet heating temperature, it is incubated 1h；
（5）Rolling process：Diameter 16mm Ribbed Bar is rolled into using rod hot rolling machine, start rolling temperature control is 1060 DEG C,
Draught per pass control is 20%；Final rolling temperature control is 950 DEG C, and draught per pass control is 15%；Finishing temperature is 800
℃；Room temperature is naturally cooled to after rolling on cold bed.
The present embodiment 630MPa level high-strength tenacity hot rolled ribbed bars tensile strength：821MPa, yield strength：652MPa,
Maximum elongation percentage：21.12%, reinforcing bar to elongation percentage during maximum, force：12.82%, strong flexor ratio：1.26.
The present embodiment 630MPa level high-strength tenacity hot rolled ribbed bars are organized as pearlite+ferrite, room temperature microstructure
See Fig. 1；The mean intercept for measuring crystal grain is 5.858 μm, and grain size is 11.5 grades.
Embodiment 2
The a diameter of 20mm of the present embodiment 630MPa level high-strength tenacity hot rolled ribbed bars, the reinforcing bar chemical composition composition and its matter
Measuring percentage composition is：C：0.24%, Mn：1.58%, Si：0.75%, V：0.097%, Cr：0.34%, N：0.0185%, P：0.015%,
S：0.016%, remaining is Fe and inevitable impurity；Vanadium nitrogen ratio is 5.24.
The present embodiment 630MPa level high-strength tenacities method for producing hot rolled ribbed include smelting, refining, continuous casting, heating and
Rolling process, concrete technology step are as described below：
（1）Smelting procedure：Melting carries out composition coarse adjustment in converter；
（2）Refining procedure：Argon gas is passed through outside ladle, refining carries out trimming, effective vanadium nitrogen mass ratio is pressed at Argon station
4.5:1 ratio adds vanadium iron and nitrogenized manganese；
（3）Continuous casting working procedure：Baking of tundish temperature is 1080 DEG C, and crystallizer is poured into a mould using whole process protection arc；It is casting continuously to form section
150mm × 150mm small billet；
（4）Heating process：1200 DEG C of billet heating temperature, it is incubated 1h；
（5）Rolling process：Diameter 20mm Ribbed Bar is rolled into using rod hot rolling machine, start rolling temperature control is 1100 DEG C,
Draught per pass control is 25%；Final rolling temperature control is 950 DEG C, and draught per pass control is 25%；Finishing temperature is 950
℃；Room temperature is naturally cooled to after rolling on cold bed.
The present embodiment 630MPa level high-strength tenacity hot rolled ribbed bars tensile strength：850MPa, yield strength：659MPa,
Maximum elongation percentage：22.72%, reinforcing bar to elongation percentage during maximum, force：13.26%, strong flexor ratio：1.29.
The present embodiment 630MPa level high-strength tenacity hot rolled ribbed bars are organized as pearlite+ferrite, room temperature microstructure
See Fig. 2；The mean intercept for measuring crystal grain is 6.672 μm, and grain size is 11 grades.
Embodiment 3
The a diameter of 32mm of the present embodiment 630MPa level high-strength tenacity hot rolled ribbed bars, the reinforcing bar chemical composition composition and its matter
Measuring percentage composition is：C：0.25%, Mn：1.50%, Si：0.60%, V：0.15%, Cr：0.35%, N：0.021%, P：0.005%, S：
0.025%, remaining is Fe and inevitable impurity；Vanadium nitrogen ratio is 6.81.
The present embodiment 630MPa level high-strength tenacities method for producing hot rolled ribbed include smelting, refining, continuous casting, heating and
Rolling process, concrete technology step are as described below：
（1）Smelting procedure：Melting carries out composition coarse adjustment in converter；
（2）Refining procedure：Argon gas is passed through outside ladle, refining carries out trimming, effective vanadium nitrogen mass ratio 6 is pressed at Argon station:1
Add vanadium iron and nitrogenized manganese；
（3）Continuous casting working procedure：Baking of tundish temperature is 1050 DEG C, and crystallizer is poured into a mould using whole process protection arc；It is casting continuously to form section
150mm × 150mm small billet；
（4）Heating process：1100 DEG C of billet heating temperature, it is incubated 1.5h；
（5）Rolling process：Diameter 30mm Ribbed Bar is rolled into using rod hot rolling machine, start rolling temperature control is 1050 DEG C,
Draught per pass control is 7%；Final rolling temperature control is 850 DEG C, and draught per pass control is 10%；Finishing temperature is 870
℃；Room temperature is naturally cooled to after rolling on cold bed.
The present embodiment 630MPa level high-strength tenacity hot rolled ribbed bars tensile strength：842MPa, yield strength：648MPa,
Maximum elongation percentage：20.08%, reinforcing bar to elongation percentage during maximum, force：14.04%, strong flexor ratio：1.25.
The present embodiment 630MPa level high-strength tenacity hot rolled ribbed bars are organized as pearlite+ferrite, room temperature microstructure
See Fig. 3；The mean intercept for measuring crystal grain is 7.322 μm, and grain size is 11 grades.
Embodiment 4
The a diameter of 10mm of the present embodiment 630MPa level high-strength tenacity hot rolled ribbed bars, the reinforcing bar chemical composition composition and its matter
Measuring percentage composition is：C：0.25%, Mn：1.60%, Si：0.65%, V：0.08%, Cr：0.32%, N：0.012%, P：0.025%, S：
0.005%, remaining is Fe and inevitable impurity；Vanadium nitrogen ratio is 6.67.
The present embodiment 630MPa level high-strength tenacities method for producing hot rolled ribbed include smelting, refining, continuous casting, heating and
Rolling process, concrete technology step are as described below：
（1）Smelting procedure：Melting carries out composition coarse adjustment in converter；
（2）Refining procedure：Argon gas is passed through outside ladle, refining carries out trimming, effective vanadium nitrogen mass ratio 3 is pressed at Argon station:1
Add vanadium iron and nitrogenized manganese；
（3）Continuous casting working procedure：Baking of tundish temperature is 1100 DEG C, and crystallizer is poured into a mould using whole process protection arc；It is casting continuously to form section
150mm × 150mm small billet；
（4）Heating process：1200 DEG C of billet heating temperature, it is incubated 2h；
（5）Rolling process：Diameter 10mm Ribbed Bar is rolled into using Wire-rod hot-rolling mill, start rolling temperature control is 1150 DEG C,
Draught per pass control is 30%；Final rolling temperature control is 1050 DEG C, and draught per pass control is 35%；Finishing temperature is
1000℃；Room temperature is naturally cooled to after rolling on cold bed.
The present embodiment 630MPa level high-strength tenacity hot rolled ribbed bars tensile strength：842MPa, yield strength：663MPa,
Maximum elongation percentage：20.08%, reinforcing bar to elongation percentage during maximum, force：12.1%, strong flexor ratio：1.27.
The present embodiment 630MPa level high-strength tenacity hot rolled ribbed bars are organized as pearlite+ferrite, room temperature microstructure
See Fig. 4；The mean intercept for measuring crystal grain is 5.598 μm, and grain size is 12 grades.
Above example is only to illustrative and not limiting technical scheme, although with reference to above-described embodiment to this hair
It is bright to be described in detail, it will be understood by those within the art that：Still the present invention can be modified or be waited
With replacing, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should cover the power in the present invention
Among sharp claimed range.
Claims (10)
- A kind of 1. 630MPa levels high-strength tenacity hot rolled ribbed bars, it is characterised in that Ribbed Bar chemical composition composition and Its weight/mass percentage composition is：C：0.20~0.25%, Mn：1.50~1.60%, Si：0.60~0.75%, V：0.08~0.15%, Cr：0.30~0.35%, N：0.012~0.025%, P：0.005-0.025%, S：0.005-0.025%, remaining is Fe and can not kept away The impurity exempted from.
- 2. a kind of 630MPa levels high-strength tenacity hot rolled ribbed bars according to claim 1, it is characterised in that described with ribbing Vanadium nitrogen is than controlling 4~7 in reinforcing bar chemical composition；The a diameter of 10-32mm of Ribbed Bar.
- 3. a kind of 630MPa levels high-strength tenacity hot rolled ribbed bars according to claim 1, it is characterised in that described with ribbing Reinforcing bar microscopic structure is pearlite+ferrite, and grain size is 11-12 levels.
- 4. a kind of 630MPa levels high-strength tenacity hot rolled ribbed bars according to claim 1, it is characterised in that described with ribbing Steel bar mechanics performance is：Yield strength >=630MPa, tensile strength >=760MPa, elongation after fracture >=15%, strong flexor ratio >= 1.25。
- 5. the producer based on a kind of 630MPa levels high-strength tenacity hot rolled ribbed bars described in claim 1-4 any one Method, it is characterised in that the production method includes smelting, refining, continuous casting, heating and rolling process.
- 6. a kind of production method of 630MPa levels high-strength tenacity hot rolled ribbed bars according to claim 5, its feature exist In, the smelting procedure, the melting progress composition coarse adjustment in converter, electric arc furnaces or other smelting furnaces.
- 7. a kind of production method of 630MPa levels high-strength tenacity hot rolled ribbed bars according to claim 5, its feature exist In, the refining procedure, argon gas is passed through outside ladle, refining carries out trimming, adds vanadium iron and nitrogenized manganese at Argon station, examines Consider yield of alloy, its active ingredient vanadium nitrogen added is than being 3 in mass ratio:1-6:1.
- A kind of 8. producer of 630MPa levels high-strength tenacity hot rolled ribbed bars according to claim 5-7 any one Method, it is characterised in that the continuous casting working procedure, baking of tundish temperature are 1050-1100 DEG C, and crystallizer is protected to arc using whole process Shield cast；It is casting continuously to form section 150mm × 150mm small billet.
- A kind of 9. producer of 630MPa levels high-strength tenacity hot rolled ribbed bars according to claim 5-7 any one Method, it is characterised in that the heating process, 1100-1200 DEG C of billet heating temperature, be incubated 1-2h.
- A kind of 10. producer of 630MPa levels high-strength tenacity hot rolled ribbed bars according to claim 5-7 any one Method, it is characterised in that the rolling process, using Bar Wire Product hot mill rolling, start rolling temperature is controlled at 1050~1150 DEG C, often Reduction in pass is controlled 7~30%；At 850~1050 DEG C, draught per pass is controlled 10~35% for final rolling temperature control；Eventually Temperature is rolled for 800-1000 DEG C；Room temperature is naturally cooled to after rolling on cold bed.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN109881118A (en) * | 2019-04-17 | 2019-06-14 | 魏滔锴 | A kind of 650MPa grades of high-strength explosion-proof fire resisting reinforcing bar steel and its thermal mechanical rolling technique |
| CN110541108A (en) * | 2019-07-26 | 2019-12-06 | 马鞍山钢铁股份有限公司 | nb and V composite 700MPa grade high-strength anti-seismic steel bar steel and production method thereof |
| CN111101079A (en) * | 2020-01-11 | 2020-05-05 | 武钢集团昆明钢铁股份有限公司 | Large-size fine-grain high-strength anti-seismic reinforcing steel bar and preparation method thereof |
| CN111575587A (en) * | 2020-06-03 | 2020-08-25 | 青海西钢特殊钢科技开发有限公司 | Method for producing HRB600 high-strength hot-rolled ribbed steel bar by vanadium-chromium microalloying |
| CN113755762A (en) * | 2021-09-18 | 2021-12-07 | 太原理工大学 | Low-V microalloyed ultra-fine dispersion precipitated phase high-strength steel and preparation method thereof |
| IT202000016153A1 (en) * | 2020-07-03 | 2022-01-03 | Danieli Off Mecc | PROCESS FOR THE PRODUCTION OF COMPACT COILS OF MARTENSITE-FREE AND ULTRA-FINE GRAIN STEEL BARS |
| CN114015939A (en) * | 2021-10-29 | 2022-02-08 | 山东钢铁股份有限公司 | Anti-seismic steel bar and preparation method thereof |
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| CN108977729A (en) * | 2018-07-10 | 2018-12-11 | 陕钢集团汉中钢铁有限责任公司 | A kind of high strength cast iron and its production method |
| CN109881118A (en) * | 2019-04-17 | 2019-06-14 | 魏滔锴 | A kind of 650MPa grades of high-strength explosion-proof fire resisting reinforcing bar steel and its thermal mechanical rolling technique |
| CN110541108A (en) * | 2019-07-26 | 2019-12-06 | 马鞍山钢铁股份有限公司 | nb and V composite 700MPa grade high-strength anti-seismic steel bar steel and production method thereof |
| CN111101079A (en) * | 2020-01-11 | 2020-05-05 | 武钢集团昆明钢铁股份有限公司 | Large-size fine-grain high-strength anti-seismic reinforcing steel bar and preparation method thereof |
| CN111101079B (en) * | 2020-01-11 | 2021-08-20 | 武钢集团昆明钢铁股份有限公司 | Large-specification phi 28-36mm HRB600 high-strength controlled rolling steel bar for hydropower station engineering and preparation method thereof |
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| IT202000016153A1 (en) * | 2020-07-03 | 2022-01-03 | Danieli Off Mecc | PROCESS FOR THE PRODUCTION OF COMPACT COILS OF MARTENSITE-FREE AND ULTRA-FINE GRAIN STEEL BARS |
| WO2022003194A1 (en) * | 2020-07-03 | 2022-01-06 | Danieli & C. Officine Meccaniche S.P.A. | A process for manufacturing compact coils of ultra-fine grained, martensite-free steel bars |
| CN113755762A (en) * | 2021-09-18 | 2021-12-07 | 太原理工大学 | Low-V microalloyed ultra-fine dispersion precipitated phase high-strength steel and preparation method thereof |
| CN114015939A (en) * | 2021-10-29 | 2022-02-08 | 山东钢铁股份有限公司 | Anti-seismic steel bar and preparation method thereof |
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