CN104018075B - Rel >=600MPa hot rolled ribbed bars and the production method of yield tensile ratio≤0.8 - Google Patents
Rel >=600MPa hot rolled ribbed bars and the production method of yield tensile ratio≤0.8 Download PDFInfo
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Abstract
Rel >=600MPa hot rolled ribbed bars of yield tensile ratio≤0.8, its component and weight percent content are: chemical composition is by weight: C:0.18～0.22%, Si:0.4～0.8%, Mn:1.2～1.4%, P≤0.015%, S≤0.015%, V:0.065～0.08%, Nb:0.020～0.030%, N:0.009～0.015%; Production stage: conventional smelting and strand; Cooling and to room temperature to casting blank stacking; To heating steel billet; Roughing; Finish rolling; Natural air cooling is stand-by to room temperature. Yield strength >=630MPa of the present invention, tensile strength >=800MPa, percentage elongation A >=25%, Agt/% >=12.5%, and good anti-seismic performance, be yield tensile ratio <0.8, welding performance is good, and under various welding procedures, after stretching, fracture position all occurs on mother metal, bending is up to the standards, the accident of changing the original sentence to or the quality problems that do not cause because of strand macro defect.
Description
Technical field
The present invention relates to a kind of building bar and production method thereof, belong to particularly a kind of Rel of yield tensile ratio≤0.8 >=600MPa hot rolled ribbed bars and production method.
Background technology
Due to taking place frequently of the disasters such as earthquake, particularly after 5.12 Wenchuan earthquakes, the anti-seismic performance index of steel for building tradeObtain extensive concern, the anti-seismic steel bar of high strength, low yield strength ratio will become main flow gradually.
In existing production, be all by adding too much alloy and nitrogen pick-up to improve the mechanical property of anti-seismic steel bar, butToo much not only can strengthen manufacturing cost adding of alloy, and cause carbon equivalent too high and make welding performance variation; Nitrogen pick-up is too muchCan cause that strand produces the macro defects such as shrinkage cavity, bubble, loose, crackle and increases and cause steel rolling performance inconsistency lattice.
Through retrieval, the patent documentation that Chinese Patent Application No. is CN201110354368.4, it discloses a kind of containing chromium nitrogenMicroalloying HRB500E reinforcing bar and production method thereof, the present invention makes full use of invigoration effect and the antisepsis of chromium to reinforcing bar, portionDivide and replace solution strengthening element manganese and silicon, partly or entirely replace micro alloying element vanadium or niobium, utilize cheap nitrogen unit simultaneouslyElement carries out microalloy treatment to reinforcing bar, and performance trace nitrogen precipitation strength effect can be produced HRB500 grade reinforcing steel by the methodIts Rel is between 520-580MPa, and Rm is between 640-730MPa, and percentage elongation A is between 22-32%, and Rm/Rel is at 1.30-Between 1.40, clod wash qualification rate is 100%, welding carbon equivalent≤0.50, integrated cost compared with conventional method reduce 40-100 unit/Ton, three months timeliness Rel and Rm value undulating value are less than 10MPa, and welding performance is good, has good anti-corrosion property. Molten steelIn various element mass percentage content targets as follows: 0.90%≤Mn≤1.3%, 0.40%≤Si≤0.80%, 0.60%≤ Cr≤0.85%, 0.17%≤C≤0.25%, 0.012%≤N≤0.020%; While not containing Nb containing V in molten steel, meet0.045%≤V≤0.080%, meets 0.045%≤Nb≤0.080% in molten steel containing Nb while not containing V, full during simultaneously containing V and NbFoot, 0.040%≤V+Nb≤0.075%; The dendritic segregation that its shortcoming Cr element easily produces in process of setting, thus produceBanded structure, and banded structure makes the mechanical property of steel produce directionality, and the horizontal plastic property of steel and toughness index are reduced, andIts yield strength does not reach 600MPa.
Chinese Patent Application No. is the patent documentation of CN201110350194.4, discloses a kind of 600MPa level high containing vanadiumThe production method of strong hot-rolled reinforced bar, comprises steel making working procedure and rolling process, it is characterized in that the basis of steel making working procedure at 20MnSiUpper increase vanadium and nitrogen, comprise following processing step: 1. increase vanadium: converter and refining adopt vanadium slag alloying to increase vanadium and adopt vanadium ironIncrease vanadium with ferrovanadium nitride, composition coarse adjustment is carried out in converter, and trimming is carried out in refining; 2. nitrogen pick-up fixed nitrogen: converter and refining adopt nitrogenChange manganese, silicon nitride, nitriding silicon-manganese alloy and ferrovanadium nitride nitrogen pick-up fixed nitrogen, omnidistance soft blow N Gas Alloying; By above-mentioned steps, controlIn steel, the mass percent of each composition is: 0.21～0.25%C, and 0.35～0.60%Si, 1.35～1.55%Mn, 0.08～0.12%V, 0.005～0.04%N ,≤0.040%S ,≤0.040%P, all the other are Fe and inevitable impurity; RollingOperation: when rolling, steel billet start rolling temperature is by 970～1150 DEG C of scope controls, and while ensureing strand heating, vanadium is uniformly distributed, and finish rolling is pressed850～970 DEG C of scope controls and overall reduction >=50%. Its shortcoming is that nitrogen pick-up technique is by nitrogen blowing mode, in practical operationControl difficulty is large, and N too high levels, easily causes that strand macrostructure Level increases, and has carried out before going up cold bed simultaneouslyWear water, reduced the percentage elongation of steel when gaining in strength, anti-seismic performance index Agt can not meet.
Chinese Patent Application No. is the patent documentation of CN201210252106.1, discloses a kind of 600MPa level antidetonation spiral shellLine reinforcing bar and manufacture method thereof. This spiral comprises following component: basis: C0.21～0.26%, and Si0.61～0.80%, Mn1.30～1.60%, V0.15～0.21%; Optional member: Nb0.001～0.050%, Ti0.001～0.050%, Cr0.10～0.50%, B0.0001～0.0050%, any one in Mo0.001～0.010% or twoCombination more than kind; All the other are Fe and inevitable impurity. The manufacture method of this spiral adopts " converter or electric furnace smelting+ continuous small-billet casting tandem rolling+cold bed is cooling " abbreviated system. The spiral tensile strength that adopts mentioned component and method to produce> 730MPa, yield strength > 600MPa, elongation after fracture > 14%, maximum, force percentage of total elongation > 9%, strong flexor ratio > 1.25.Its shortcoming is that V content exceedes more than 0.15%, and is mainly to utilize the solution strengthening of vanadium to improve intensity, do not make full use of vanadiumPrecipitation strength improves intensity, and vanadium to propose high-intensity effect be that precipitation strength is greater than solution strengthening; Its carbon equivalent is all 0.5 simultaneouslyAbove, welding performance can be not very good.
Summary of the invention
The present invention is directed to the deficiency that above-mentioned prior art exists, provide a kind of and ensureing, under the prerequisite of mechanical property, to make welderingConnect performance better, make strand macro defect rank be down to 0～0.5 grade by 1.5～2.5 grades by the content of controlling nitrogen, withTime crystal grain rank be greater than 9.5 grades, the hot-rolled ribbed anti-seismic steel bar of 600MPa and the production method of yield tensile ratio≤0.8.
The application to achieve these goals, on realize the application object play impact or the alloy unit of key effectElement and technique conduct in-depth research: even under the prerequisite of guaranteed performance, can also realize described in the application significantlyReduce strand macro defect rank, make its rank be down to 0～0.5 grade by 1.5～2.5 grades; Crystal grain rank is greater than 9.5 grades of orders simultaneously, therefore proposed to adopt is mainly to have adopted raising V, Nb constituent content aspect composition, in niobium, vanadium and the steel that makes to addCarbon, nitrogen-atoms form tiny carbide and carbonitride, these carbide and carbonitride are converted into iron element at austeniteIn body and pearlitic process and after changing, separate out gradually, play the effect of the room temperature texture of refinement reinforcing bar, and hinder in latticeDislocation motion, produce the effect of precipitation strength, finally reach the obdurability that improves steel; V, Nb stack thinning microstructure and precipitation are strongThe effect of changing makes strengthening effect more remarkable; Secondly also adopted the content of strict restriction N element, can further reach maximum strongChange effect, and can not make elemental gas too much cause slab quality problem; The optimization of composition, also needs the technique of coupling,Therefore, after deliberation, process aspect is mainly that to have taked zerolling be that roughing start rolling temperature exists to the application: 1000～1100DEG C, finish rolling finishing temperature is not higher than the measure of 880 DEG C, and zerolling is that heating steel billet is arrived lower than conventional heating temperature, temperatureToo low, the one, make micro alloying element solid solution thoroughly need to not extend the heat time, the 2nd, when rolling, milling train needs to roll more greatlyPower processed and reduce the active time of equipment; Temperature is too up to the object of the rolling less than low temperature; Finishing temperature more approaches phase alternating temperatureDegree, the original austenite grains of steel billet is less, and the austenite crystal that corresponding rolling is ended by rolling deformation is also less, because ofAnd make crystal grain obtain refinement, performance improves, so finishing temperature is not higher than 880 DEG C.
Realize the measure of above-mentioned purpose:
Rel >=600MPa hot rolled ribbed bars of yield tensile ratio≤0.8, its component and weight percent content are: chemistry becomesDivide and be by weight: C:0.18～0.22%, Si:0.4～0.8%, Mn:1.2～1.4%, P≤0.015%, S≤0.015%, V:0.065～0.08%, Nb:0.020～0.030%, N:0.009～0.015%, all the other are Fe and impurity element.
Preferably: when the diameter of reinforcing bar is when being greater than Φ 25mm to Φ 40mm specification, its following component is in this weight percentThan adding in scope: C0.20～0.22%, V0.07～0.08%, N0.012～0.015%.
The method of Rel >=600MPa hot rolled ribbed bars of production yield tensile ratio≤0.8, its step:
1) conventional smelting and strand: nitrogen pick-up adopts the conventional nitrogen-containing alloy mode of adding; Tapping temperature is at 1680～1700 DEG C;Casting speed is not higher than 1.8m/min;
2) strand is carried out to stacking cooling and to room temperature;
3), to heating steel billet, control soaking zone temperature is: 1050～1150 DEG C, soaking time is at 100 ~ 120min;
4) carry out roughing, and control its start rolling temperature and exist: 1000～1100 DEG C;
5) carry out finish rolling, control finish rolling start rolling temperature at 840～860 DEG C, finishing temperature is no more than 830 DEG C, total compressionThan being not less than 31, compression ratio becomes negative correlativing relation with bar diameter;
6) natural air cooling is stand-by to room temperature.
The effect of each element and master operation in the present invention
C:C improves steel strength the most effective element, but when its content is lower than 0.18% time, can cause mechanical propertyThereby not enough and increase alloy addition level and increased production cost, when its content is high by 0.22%, can produce plasticity and toughness to decline,Make welding performance defective, therefore, C of the present invention is chosen in 0.15 ~ 0.22%.
Si: be a kind of displacement intensified element of cheapness, can significantly improve the intensity of steel, but Si too high levels can affectThe welding performance of steel, so select the scope of Si 0.4～0.8%
Mn: significantly reduce the phase transition temperature of steel, by controlled rolling process, crystal grain thinning, comprehensively improves the comprehensive of steelCan, but the too high meeting of Mn causes the hot deterioration of solderability and welding heat affected zone, so select the scope of Mn 1.2～1.4%;
P, S: as harmful element, its content is more low better. S too high levels, can form a large amount of MnS and be mingled with, and reduces steelThe mechanical performance of material, therefore content is more low better, so select scope ≤0.015% of S; P, easily at cyrystal boundary segregation, increases steelThe fragility of muscle, therefore content is more low better, so select scope ≤0.015% of P.
Nb: be strong carbide section bar element, Austenite Grain Growth can suppress hot rolling time, thinning microstructure, improves reinforcing barComprehensive mechanical property, but Nb content easily makes higher than 0.030% time precipitated phase thick and weaken precipitating reinforcing effect, and can showWork increases cost, and Nb content is lower than 0.020% time, and thinning effect is not obvious, and steel performance reaches requirement, so select the model of NbBe trapped among 0.02～0.03%.
V: be micro alloyed steel the most frequently used be also one of the most effective intensified element. The effect of vanadium is by forming VN, V(CN) affect tissue and the performance of steel, it is mainly Precipitation in the ferrite of austenite grain boundary, refinement ferrite crystalline substanceGrain, can improve tensile strength significantly and yield strength increases not obviously, effectively reduces the yield tensile ratio of material. V is lower than 0.065%Time, precipitating reinforcing effect can not meet mechanical property requirements, and V is higher than 0.08% time, and precipitation strength makes intensity too high and cause toughProperty variation, so select the scope of V 0.065～0.08%.
N: separate out essential element as VN, in order to ensure certain amount of separating out, therefore, its content has minimum content,Affect internal soundness in steel but N content is high with 0.018% meeting, so select the scope of N 0.009～0.018%.
Why adopting zerolling is that roughing start rolling temperature exists: 1000～1100 DEG C, and final rolling temperature is controlled at 840～860 DEG C, it is in order to reduce strand scaling loss, to reduce costs that finishing temperature is no more than the measure of 830 DEG C, reduces decarburized layer, improves intoThe surface quality of product, grain refinement, improves the effects such as properties of product.
The present invention compared with prior art, yield strength >=630MPa, tensile strength >=800MPa, percentage elongation A >=25%,Agt/%>=12.5%, and good anti-seismic performance, i.e. yield tensile ratio<0.8, welding performance is good, under various welding procedures, drawsStretch rear fracture position and all occur on mother metal, bending inspection is also qualified, the thing of changing the original sentence to not causing because of strand macro defectTherefore or quality problems.
Brief description of the drawings
Fig. 1 is metallographic structure figure of the present invention.
Detailed description of the invention
Below the present invention is described in detail:
The strand of embodiment 3 is of a size of outside 200 × 230mm, all adopts the square billet of 200 × 200mm
Table 1 is the value list of various embodiments of the present invention and comparative example;
Table 2 is the main technologic parameters list of various embodiments of the present invention and comparative example;
Table 3 is various embodiments of the present invention and the list of comparative example Performance Detection situation.
Various embodiments of the present invention are produced according to following steps:
1) conventional smelting and strand: nitrogen pick-up adopts the conventional nitrogen-containing alloy mode of adding; Tapping temperature is at 1680～1700 DEG C;Casting speed is not higher than 1.8m/min;
2) strand is carried out to stacking cooling and to room temperature; Forbid water-cooled;
3), to heating steel billet, control soaking zone temperature is: 1050～1150 DEG C, soaking time is at 100 ~ 120min;
4) carry out roughing, and control its start rolling temperature and exist: 1000～1100 DEG C;
5) carry out finish rolling, control finish rolling start rolling temperature at 840～860 DEG C, finishing temperature is no more than 830 DEG C, total compressionThan being not less than 31, compression ratio becomes negative correlativing relation with bar diameter; Forbid water-cooled;
6) natural air cooling is stand-by to room temperature.
The chemical composition list (wt%) of table 1 embodiment of the present invention and comparative example
The main technologic parameters list of table 2 various embodiments of the present invention and comparative example
Note: the reference liquidus temperature of steel grade of the present invention is 1507 DEG C.
The mechanical property contrast list of table 3 various embodiments of the present invention and comparative example
As can be seen from Table 3, intensity of the present invention is still suitable with the reinforcement property of current production, but plastic property is better,Crystal grain is more tiny, and anti-seismic performance meets.
Above-described embodiment only exemplifies for the best, and is not the restriction to embodiments of the present invention.
Claims (1)
1. the method for Rel >=600MPa hot rolled ribbed bars of production yield tensile ratio≤0.8, its step:
1) routine is smelted into component and weight percent content is: C:0.18～0.22%, Si:0.4～0.8%, Mn:1.2～1.4%, P≤0.015%, S≤0.015%, V:0.065～0.08%, Nb:0.020～0.030%, N:0.009～0.015%, itsRemaining is molten steel the strand of Fe and impurity element; Carbon equivalent is controlled at 0.41 ~ 0.45; Nitrogen pick-up adopts the conventional nitrogen-containing alloy side that addsFormula; Tapping temperature is at 1680～1700 DEG C; Casting speed is not higher than 1.8m/min;
2) strand is carried out to stacking cooling and to room temperature;
3), to heating steel billet, control soaking zone temperature is: 1050～1136 DEG C, soaking time is at 100 ~ 120min;
4) carry out roughing, and control its start rolling temperature and exist: 1000～1049 DEG C;
5) carry out finish rolling, control finish rolling start rolling temperature at 840～860 DEG C, finishing temperature is no more than 830 DEG C, and total compression ratio is notLower than 31, compression ratio becomes negative correlativing relation with bar diameter;
6) natural air cooling is stand-by to room temperature.
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