CN103409683B - 600MPa hot rolled ribbed steel bar and production method thereof - Google Patents
600MPa hot rolled ribbed steel bar and production method thereof Download PDFInfo
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Abstract
The invention discloses a 600MPa hot rolled ribbed steel bar and a production method thereof. The 600MPa hot rolled ribbed steel bar comprises the following components in percentage by weight: 0.17-0.25% of C, 0.4-0.8% of Si, 1.2-1.6% of Mn, less than or equal to 0.045% of P, less than or equal to 0.045% of S, 0.12-0.15% of V, 0.003-0.015% of N and 0.025-0.045% of Nb. The production method comprises the following steps of molten iron desulphurization; converter top and bottom blowing; LF (Low Frequency) furnace refining; continuous casting; stacking and cooling to the room temperature; casting blank heating; rough rolling and fine rolling; and naturally cooling to the room temperature. Compared with the prior art in which a vanadium-niobium and vanadium-nitrogen micro-alloying technology is adopted, the 600MPa hot rolled ribbed steel bar has the yield strength of over 600MPa in a hot rolled state, the elongation A of larger than or equal to 19% and favorable welding performance on the premise that the cost is greatly reduced. The 600MPa hot rolled ribbed steel bar is prohibited from water cooling or water touching.
Description
Technical field
The present invention relates to a kind of reinforcing bar and production method thereof, belong to a kind of Ribbed Bar and production method thereof particularly, be particularly useful for the 600MPa level hot rolled ribbed steel bar and the production method thereof that are improved intensity by vanadium niobium micro-alloy intensifying technology.
Background technology
Along with the development rapidly of building industry, the requirement of the complex construction such as large public building, Highrise buildings to reinforcing bar supporting capacity is more and more higher, requires that reinforcing bar has the over-all propertieies such as higher intensity, toughness and good weldability.HRB600 High Strength Steel Bar is as the hot rolled ribbed steel bar of highest level in current GB, compared with HRB335, HRB400, HRB500 level reinforcing bar mainly used at present, Saving steel amount 73.3%, 44.4% and 19.5% can be distinguished, there is the realistic meaning of energy-saving and emission-reduction, on the other hand, the problem of fat beams and columns in building structure can be solved, increase building usable floor area, make structure design more flexible, improve building using function, alleviate steel mill simultaneously and blindly to devote exclusive attention to output the problems such as the environmental pollution that brings.
The 600MPa hot rolled ribbed steel bar produced at present, as Chinese Patent Application No. be CN201210252106.1 patent document discloses a kind of 600MPa level antidetonation Twisted Steel and manufacture method thereof.This Twisted Steel comprises following component: basal component: C 0.21 ~ 0.26%, Si 0.61 ~ 0.80%, Mn 1.30 ~ 1.60%, V 0.15 ~ 0.21%; Any one or two or more combinations in optional component: Nb 0.001 ~ 0.050%, Ti 0.001 ~ 0.050%, Cr 0.10 ~ 0.50%, B 0.0001 ~ 0.0050%, Mo 0.001 ~ 0.010%; All the other are Fe and inevitable impurity.The manufacture method of this Twisted Steel adopts " converter or electrosmelting+continuous small-billet casting tandem rolling+cold bed cooling " abbreviated system.Adopt the Twisted Steel tensile strength > 730MPa that mentioned component and method are produced, yield strength > 600MPa, elongation after fracture > 14%, maximum, force percentage of total elongation > 9%, strong flexor ratio > 1.25.Its deficiency existed is: the increase of carbon content makes the carbon equivalent of steel increase, and causes the deterioration of the welding property of reinforcing bar, and welding property is deteriorated; Country carries out the policy of High Strength Steel Bar energetically, and cause the vanadium needed for the HRB600 of conveniently explained hereafter, Chrome metal powder price unprecedentedly soaring, production cost is too high, has tied up the space of enterprise completely, has been unfavorable for that enterprise enhances competitiveness; If publication number is 102383033A, patent name is " a kind of 600MPa level is containing vanadium high-strength hot-rolled steel bar and production method thereof " patent documentation, provide a kind of 600MPa level high-strength hot-rolled steel bar preparation method: adopt converter+LF refining, omnidistance nitrogen blowing in smelting process, and add the nitrogen-containing alloy such as VN, silicon nitride and carry out nitrogen pick-up fixed nitrogen, adopt low temperature heavy reduction rolling in finishing stands.Disclosed in it, reinforcing bar composition is: C:0.21 ~ 0.25%, Si 0.35 ~ 0.60%, Mn 1.30 ~ 1.55%, V 0.08 ~ 0.12%, N0.05 ~ 0.04%, S :≤0.040%, P :≤0.040%.Its Shortcomings is: finish rolling adopts low temperature heavy reduction rolling, higher to the performance requriements of milling train, is unsuitable for old-fashioned milling train, is difficult to widely apply in present stage; VN alloy is a kind of composite alloy, and it prepares complexity, and expensive, production cost is high, and enterprise produces and is short of power, and output cannot mass-producing; The too high blank subsurface bubble that easily causes of N content is too much, affects final product quality.
Summary of the invention
The present invention is directed to that prior art exists because adding the too high and welding property compromises that brings of carbon equivalent that too much alloy causes, and nitrogen pick-up too much causes strand macro defect to increase the deficiency of performance inconsistency lattice when bringing steel rolling, there is provided a kind of As rolled yield strength at more than 630MPa, unit elongation A >=19%, the hot rolled ribbed steel bar that welding property is excellent and production method thereof.
Realize the measure of above-mentioned purpose:
A kind of 600Mpa hot rolled ribbed steel bar and production method thereof, its component and weight percent content are: C:0.17 ~ 0.25%, Si:0.4 ~ 0.8%, Mn:1.2 ~ 1.6%, P≤0.045%, S≤0.045%, V:0.12 ~ 0.15%, N:0.003 ~ 0.015%, Nb:0.025 ~ 0.045%, and all the other are Fe and impurity element; Format diameter is 12 ~ 40mm;
Wherein: when diameter is at 12 ~ 16mm, component and weight percent content are: C:0.17 ~ 0.25%, Si:0.4 ~ 0.8%, Mn:1.2 ~ 1.6%, P≤0.045%, S≤0.045%, V:0.12 ~ 0.133%, N:0.003 ~ 0.009%, Nb:0.025 ~ 0.035%;
When diameter is greater than 16mm to 25mm, component and weight percent content are: C 0.19 ~ 0.25%, Si 0.5 ~ 0.8%, Mn 1.3 ~ 1.5%, P≤0.045%, S≤0.045%, V 0.134 ~ 0.14%, Nb 0.030 ~ 0.040%, N 0.008 ~ 0.012%;
When diameter is greater than 25mm to 40mm, component and weight percent content are: C 0.22 ~ 0.25%, Si 0.4 ~ 0.8%, Mn 1.2 ~ 1.5%%, P≤0.045%, S≤0.045%, V 0.14 ~ 0.15%, Nb 0.035 ~ 0.045%, N 0.011 ~ 0.015%.
Produce the method for the hot rolled ribbed steel bar of a kind of 600MPa, its step:
1) desulfurizing iron is carried out: adopt spray magnesium powder sulfur removal technology, and control molten steel sulfur content [S]≤0.010%, desulfurization slag taken off totally;
2) converter top bottom blowing is carried out, when tap to molten steel total amount 1/4 time, ferro-silico-manganese is added according to 21 ~ 23 kgs/tonne of steel in molten steel, silicon carbide is added according to 1.4 ~ 1.6 kgs/tonne of steel, and then add vanadium iron according to 1.8 ~ 2.5 kgs/tonne of steel, add ferro-niobium according to 0.6 ~ 1 kg/tonne of steel, and add carbon dust according to being no more than 0.3 kg/tonne of steel; When molten steel measure to molten steel total amount 3/4 time, the alloy that add and carburelant must all add;
3) carry out trimming at argon station, and be blown into argon gas, it is 0.5 ~ 0.6MPa that control argon gas is blown into pressure, and flow is at 7 ~ 10Nm
3/ minute, blowing time control is 3 ~ 6 minutes;
4) carry out the refining of LF stove, and in stove, be blown into that pressure is 0.5 ~ 0.6MPa, flow is 7.0 ~ 10.0Nm
3/ minute nitrogen, the nitrogen flushing time is not less than 20 minutes; In stove, heat-up time is not less than 10 minutes;
5) continuous casting is carried out: adopt large tank long nozzle and crystallizer submersed nozzle to carry out molding casting; Middle bag covering slag adopts basic powder, and crystallizer protecting residue adopts low-carbon steel protecting slag; Middle Baogang water temp controls at 1530 ~ 1545 DEG C; Casting speed controls at 1.6 ~ 1.8 ms/min;
6) carry out stacking cooling, be cooled to room temperature;
7) to strand heating, control soaking zone temperature at 1150 ~ 1300 DEG C, be not less than 100 minutes heat-up time;
8) roughing and finish rolling is carried out: control roughing start rolling temperature at 1050 ~ 1150 DEG C; Control finish rolling finishing temperature and be no more than 1100 DEG C;
9) room temperature is naturally cooled to.
The effect of each element and master operation in the present invention
C: as the economical strengthening element of one, be dissolved in matrix, about can solution strengthening being played, therefore can not be too low, so select the scope of C 0.17 ~ 0.25%.
Si: the displacement strengthening element being a kind of cheapness, can significantly improve the intensity of steel, but Si too high levels can affect the welding property of steel, so select the scope of Si 0.4 ~ 0.8%.
Mn: the transformation temperature significantly reducing steel, by controlled rolling process, crystal grain thinning, the comprehensive over-all properties improving steel, but the too high meeting of Mn causes the hot deterioration of weldability and welded heat affecting zone, so select the scope of Mn 1.2 ~ 1.5%;
P: as harmful element, requires that its content is more low better in theory, but considers situ production cost reason, only otherwise have an impact to the performance of reinforcing bar, so by GB scope control, select the model of P enclose≤0.045%.
S: as harmful element, requires that its content is more low better in theory, but considers situ production cost reason, only otherwise have an impact to the performance of reinforcing bar, so by GB scope control, select the model of S enclose≤0.045%.
V: be microalloyed steel the most frequently used be also one of the most effective strengthening element.The effect of vanadium is the structure and properties affecting steel by forming VN, V (CN), and it is Precipitation in the ferrite of austenite grain boundary mainly, fining ferrite grains, increases the intensity of steel.After adding vanadium in steel, intensity can increase by 150 more than MPa.This effect of vanadium, the steel for hot rolling delivery seem particularly important.In the present invention, if the content of vanadium is lower than 0.12%, intensity can be produced and do not reach 600MPa rank, if higher than 0.15%, then reinforcing bar surplus capacity can be made excessive and cause alloy to waste, therefore being controlled 0.12 ~ 0.15%.
N: separate out required element as VN, in order to ensure certain amount of precipitation, therefore, its content has minimum content, but N content is higher than 0.015%, can affect internal soundness in steel, so select the scope of N 0.003 ~ 0.015%;
Nb: as crystal grain thinning and precipitation-strengthening element, can improve the intensity of steel, but time its content exceedes a certain amount of, its result no longer increases, so select the scope of Nb 0.025 ~ 0.045%;
The control reason of main technique:
The present invention adopts at argon station and is blown into argon gas, adopting nitrogen, its objective is to make uniform composition when argon station trimming, and the nitrogen of cheapness can substitute the alloy of nitrogen thus reducing costs at LF stove.
Compared with the present invention adds vanadium niobium, V-n Microalloying Technology with prior art, under the prerequisite that cost significantly reduces, its As rolled yield strength reaches more than 600MPa, unit elongation A >=19%, and welding property is excellent.The present invention forbids water-cooled or get wet.
Accompanying drawing explanation
Accompanying drawing is metallographic structure figure of the present invention.
Embodiment
Below the present invention is described in detail:
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:
Its step:
1) desulfurizing iron is carried out: adopt spray magnesium powder sulfur removal technology, and control molten steel sulfur content [S]≤0.010%, desulfurization slag taken off totally;
2) converter top bottom blowing is carried out, when tap to molten steel total amount 1/4 time, ferro-silico-manganese is added according to 21 ~ 23 kgs/tonne of steel in molten steel, silicon carbide is added according to 1.4 ~ 1.6 kgs/tonne of steel, and then add vanadium iron according to 1.8 ~ 2.5 kgs/tonne of steel, add ferro-niobium according to 0.6 ~ 1 kg/tonne of steel, and add carbon dust according to being no more than 0.3 kg/tonne of steel; When molten steel measure to molten steel total amount 3/4 time, the alloy that add and carburelant must all add;
3) carry out trimming at argon station, and be blown into argon gas, it is 0.5 ~ 0.6MPa that control argon gas is blown into pressure, and flow is at 7 ~ 10Nm
3/ minute, blowing time control is 3 ~ 6 minutes;
4) carry out the refining of LF stove, and in stove, be blown into that pressure is 0.5 ~ 0.6MPa, flow is 7.0 ~ 10.0Nm
3/ minute nitrogen, the nitrogen flushing time is not less than 20 minutes; In stove, heat-up time is not less than 10 minutes;
5) continuous casting is carried out: adopt large tank long nozzle and crystallizer submersed nozzle to carry out molding casting; Middle bag covering slag adopts basic powder, and crystallizer protecting residue adopts low-carbon steel protecting slag; Middle Baogang water temp controls at 1530 ~ 1545 DEG C; Casting speed controls at 1.6 ~ 1.8 ms/min;
6) carry out stacking cooling, be cooled to room temperature;
7) to strand heating, control soaking zone temperature at 1150 ~ 1300 DEG C, be not less than 100 minutes heat-up time;
8) roughing and finish rolling is carried out: control roughing start rolling temperature at 1050 ~ 1150 DEG C; Control finish rolling finishing temperature and be no more than 1100 DEG C;
9) room temperature is naturally cooled to.
The chemical composition (wt%) of table 1 various embodiments of the present invention and comparative example
Table 2 various embodiments of the present invention and comparative example technique significant parameter control list ()
Table 2 various embodiments of the present invention and comparative example controlled rolling process significant parameter control (two)
Table 3 various embodiments of the present invention and the list of comparative example mechanical properties test Comparative result
As can be seen from Table 3, of the present inventionly give full play to the precipitation strength effect of vanadium and the crystal grain thinning of Nb and precipitation strength, when reducing alloy addition level, As rolled yield strength is not less than 630MPa, and unit elongation is not less than 19%, after the natural aging of one month, surplus capacity also has very large, and drawn test, break on mother metal, illustrate that welding property is good.
The present invention forbids with water cooling or touches water.
Above-described embodiment is only the best and exemplifies, and is not the restriction to embodiments of the present invention.
Claims (1)
1. a production method for the hot rolled ribbed steel bar of 600MPa, its step:
1) desulfurizing iron is carried out: adopt spray magnesium powder sulfur removal technology, and control molten steel sulfur content [S]≤0.010%, desulfurization slag taken off totally;
2) converter top bottom blowing is carried out, when tap to molten steel total amount 1/4 time, ferro-silico-manganese is added according to 21 ~ 23 kgs/tonne of steel in molten steel, silicon carbide is added according to 1.4 ~ 1.6 kgs/tonne of steel, and then add vanadium iron according to 1.8 ~ 2.5 kgs/tonne of steel, add ferro-niobium according to 0.6 ~ 1 kg/tonne of steel, and add carbon dust according to being no more than 0.3 kg/tonne of steel; When molten steel measure to molten steel total amount 3/4 time, the alloy that add and carburelant must all add;
3) carry out trimming at argon station, and be blown into argon gas, it is 0.5 ~ 0.6MPa that control argon gas is blown into pressure, and flow is at 7 ~ 10Nm
3/ minute, blowing time control is 3 ~ 6 minutes;
4) carry out the refining of LF stove, and in stove, be blown into that pressure is 0.5 ~ 0.6MPa, flow is 7.0 ~ 10.0Nm
3/ minute nitrogen, the nitrogen flushing time is not less than 20 minutes; In stove, heat-up time is not less than 10 minutes;
5) continuous casting is carried out: adopt large tank long nozzle and crystallizer submersed nozzle to carry out molding casting; Middle bag covering slag adopts basic powder, and crystallizer protecting residue adopts low-carbon steel protecting slag; Middle Baogang water temp controls at 1530 ~ 1545 DEG C; Casting speed controls at 1.6 ~ 1.8 ms/min; Strand component and weight percent content are: C:0.17 ~ 0.25%, Si:0.4 ~ 0.8%, Mn:1.2 ~ 1.6%, P≤0.045%, S≤0.045%, V:0.12 ~ 0.15%, N:0.003 ~ 0.015%, Nb:0.025 ~ 0.045%, and all the other are Fe and impurity element; Format diameter is 12 ~ 40mm;
Wherein: when diameter is at 12 ~ 16mm, component and weight percent content are: C:0.17 ~ 0.25%, Si:0.4 ~ 0.8%, Mn:1.2 ~ 1.6%, P≤0.045%, S≤0.045%, V:0.12 ~ 0.133%, N:0.003 ~ 0.009%, Nb:0.025 ~ 0.035%;
When diameter is greater than 16mm to 25mm, component and weight percent content are: C 0.19 ~ 0.25%, Si 0.5 ~ 0.8%, Mn 1.3 ~ 1.5%, P≤0.045%, S≤0.045%, V 0.134 ~ 0.14%, Nb 0.030 ~ 0.040%, N 0.008 ~ 0.012%;
When diameter is greater than 25mm to 40mm, component and weight percent content are: C 0.22 ~ 0.25%, Si 0.4 ~ 0.8%, Mn 1.2 ~ 1.5%%, P≤0.045%, S≤0.045%, V 0.14 ~ 0.15%, Nb 0.035 ~ 0.045%, N 0.011 ~ 0.015%;
6) carry out stacking cooling, be cooled to room temperature;
7) to strand heating, control soaking zone temperature at 1150 ~ 1300 DEG C, be not less than 100 minutes heat-up time;
8) roughing and finish rolling is carried out: control roughing start rolling temperature at 1050 ~ 1150 DEG C; Control finish rolling finishing temperature and be no more than 1100 DEG C;
9) room temperature is naturally cooled to.
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| CN113897533A (en) * | 2021-10-13 | 2022-01-07 | 联峰钢铁（张家港）有限公司 | 600 MPa-level vanadium niobium titanium nitrogen composite reinforced steel bar and smelting method thereof |
| CN115198197A (en) * | 2022-08-22 | 2022-10-18 | 安徽吾兴新材料有限公司 | 640 MPa-grade high-strength anti-seismic reinforcing steel bar and preparation method thereof |
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