CN110306116A - A kind of plus ferro-silicon nitride HRB600 high-strength hot rolled ribbed steel bar and its manufacturing method - Google Patents

A kind of plus ferro-silicon nitride HRB600 high-strength hot rolled ribbed steel bar and its manufacturing method Download PDF

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Publication number
CN110306116A
CN110306116A CN201910709677.5A CN201910709677A CN110306116A CN 110306116 A CN110306116 A CN 110306116A CN 201910709677 A CN201910709677 A CN 201910709677A CN 110306116 A CN110306116 A CN 110306116A
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ferro
silicon nitride
temperature
hot rolled
hrb600
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杨文博
姜明芳
王小燕
李相付
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Wuhan Iron and Steel Group Echeng Iron and Steel Co Ltd
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Wuhan Iron and Steel Group Echeng Iron and Steel Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/08Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/04Making ferrous alloys by melting
    • C22C33/06Making ferrous alloys by melting using master alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/001Ferrous alloys, e.g. steel alloys containing N
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/005Ferrite
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/009Pearlite

Abstract

The present invention discloses a kind of plus ferro-silicon nitride HRB600 high-strength hot rolled ribbed steel bar and its manufacturing method, wherein, the component of the reinforcing bar includes C, Si, Mn, P, S, Nb, the Fe and impurity of V and surplus, and said components constituent content meets carbon equivalent Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15≤0.58% simultaneously, manufacturing method is by carrying out alloying in argon station processing addition ferro-silicon nitride, the ferro-silicon nitride of addition is greater than the affinity of V and C due to the affinity of V and N, VN is more easily formed in conjunction with the N in steel, after adding ferro-silicon nitride, a large amount of V is precipitated to form VN, VC alloy, to increase the precipitation enhancement and Grain refinement of V;Hot rolled ribbed bars provided by the invention, by adding ferro-silicon nitride in molten steel, part, which substitutes VN alloy, reduces the use of VN alloy, saves great amount of cost, production process is simple, is easy to be produced in batches.

Description

A kind of plus ferro-silicon nitride HRB600 high-strength hot rolled ribbed steel bar and its manufacturing method
Technical field
The present invention relates to the manufacturing technology field of steel, in particular to a kind of plus ferro-silicon nitride the high-strength hot-rolled band of HRB600 Rib reinforcement and its manufacturing method.
Background technique
Hot rolled ribbed bars are the main reinforcing materials of reinforced concrete buildings, carry drawing in the structure, pressure is answered Power and strain, reinforcing bar are reprocessed the various load such as effect (welding, mechanical connection, bending or straightening), are widely used.With height Layer, large span, antidetonation, low temperature resistant, fire-resistive construction structure appearance, user do not require nothing more than reinforcing bar intensity with higher, and Also require its toughness with higher and good welding performance.
With economic sustainable and stable development, a large amount of armored concrete hot-rolled strip rib steels of production and consumption are required every year Muscle, regular reinforcement is largely using being HRB400 at present, and HRB500 reinforcing bar, compared to above-mentioned regular reinforcement, HRB600 is hot-rolled ribbed Reinforced steel bar strength is high, good extending performance, saves rolled steel dosage.
Just like a kind of Chinese patent " production method of HRB600 hot rolled ribbed bars " number of patent application CN201210009634.4, including the reinforcing of converter smelting, steel billet, ar blowing refining, casting, steel billet inspection, heating stove heating, control Processes, the features such as cold, finished product detection, scale packaging, product warehousing are slightly controlled after rolling, rolling to be had: 1. converter smelting is tapped Process is using double Slag Retaining Process;2. steel billet, which strengthens process, uses Cr, Nb, VN microalloy complex intensifying;3. ar blowing refining technology;④ Process is poured to be poured using full guard;5. controlled rolling process, microalloy element prevents the recrystallization process of austenite, controls micro- The precipitation enhancement of alloying element achievees the purpose that improve reinforced steel bar strength;6. rolling rear microcontroller cooling process, austenite is prevented Crystal grain is grown up again, it is ensured that reinforcing bar comprehensive performance.Using this method, straight carbon steel can also produce HRB600 hot rolled ribbed bars;Steel Muscle even tissue, comprehensive performance are improved.But compared with hot rolled ribbed bars of the present invention, it is this molten ferro-silicon nitride is not mentioned Agent.
Just like Chinese patent " a kind of niobium-titanium-boron microalloy HRB600 high-strength anti-seismic steel bar and its preparation " number of patent application CN201210340408.4 obtains the chemistry with following mass ratio by smelting molten steel, molten steel pouring, steel billet controlled rolling and controlled cooling The niobium-titanium-boron microalloy HRB600 high-strength anti-seismic steel bar of ingredient: C:0.14~0.18wt%, Si:0.30~0.50wt%, Mn: 0.50~0.75wt%, Cr:0.50~0.70wt%, Nb:0.030~0.050wt%, B:0.0015~0.0030wt%, Ti: 0.020~0.040wt%, S≤0.045wt%, P≤0.045wt%, remaining is Fe and inevitable impurity.The present invention has The features such as technique applicability and strong controlling, has good low strain dynamic timeliness, high-intensitive, high-plasticity, good welding Property, excellent shock resistance.But compared with hot rolled ribbed bars of the present invention, this solvent of ferro-silicon nitride is not mentioned.
Separately there is a Chinese patent " a kind of HRB600 reinforcing bar and its production method " number of patent application CN201210374334.6, the reinforcing bar consist of the following compositions by weight percentage: C:0.21 ~ 0.25%, Mn:1.40 ~ 1.80%, Si:0.65 ~ 0.85%, V:0.08 ~ 0.12%, S≤0.020%, P≤0.025%, N:0.016 ~ 0.024%;Remaining is Fe and can not The impurity avoided.Its production method includes smelting procedure, refining procedure, continuous casting working procedure and rolling process, in the smelting procedure It is middle to use v n micro alloying, and micro- nitrogen alloy is added into molten steel in the refining procedure and carries out nitrogen pick-up processing, so that HRB600 reinforcing bar contains 0.08 ~ 0.12% V and 0.016 ~ 0.024% N by weight percentage.The reinforcing bar has high yield strong Degree, high-tensile, high-elongation, and also the dosage of micro alloying element V is few.But do not have compared with hot rolled ribbed bars of the present invention Mention this solvent of ferro-silicon nitride.
Summary of the invention
The purpose of the present invention is to propose to a kind of plus ferro-silicon nitride HRB600 high-strength hot rolled ribbed steel bar and its manufacturers Method solves the problems, such as that the usage amount of existing high-strength hot rolled ribbed steel bar VN alloy is big, at high cost, the specification of the reinforcing bar is 6 ~ 16mm, eliminates heat treatment procedure in technique, room temperature lower yield strength >=640MPa, tensile strength >=860MPa, and elongation percentage >= 18%, there is excellent low-temperature flexibility and high intensity, suitable for building the steel construction of ship and ocean engineering.
To achieve the above object, the present invention proposes a kind of plus ferro-silicon nitride HRB600 high-strength hot rolled ribbed steel bar, Component and weight percent content include:
C:0.24~0.28%, Si:0.50~0.80%, Mn:1.40~1.60%, P≤0.018%, S≤0.016%, Nb:0.015 ~0.020%, V:0.130 ~ 0.170%, N:0.007 ~ 0.008%, and meet carbon equivalent Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15≤0.54%, remaining is Fe and inevitable impurity.
Preferably, yield strength >=640MPa under the hot rolled ribbed bars room temperature, tensile strength >=860MPa extend Rate >=18%.
Preferably, the diameter of the reinforcing bar is 6 ~ 16mm.
In addition, to achieve the above object, the present invention proposes a kind of plus ferro-silicon nitride the high-strength hot rolled ribbed steel of HRB600 The manufacturing method of muscle includes the following steps: that converter → Argon → refining → continuous casting → red send → blank examination → heating → rolling → cooling → packaging → inspection → storage, specifically:
(1) the converter step is in furnace bottom top top-bottom blowing;
(2) the Argon step carries out alloying in argon station processing addition ferro-silicon nitride, adds the alloy smeltings such as ferro-silicon nitride, really Alloy is protected to be sufficiently uniformly dissolved;
(3) refinement step finely tunes ingredient and temperature, strict control in smelting, C, Si, Mn, P, S, Nb, V in refining furnace Ingredient simultaneously guarantees Ceq in control range, while strict control molten steel out-station temperature keeps casting machine pulling rate constant;
(4) the heating stepses slab preheating temperature is 600 ~ 850 DEG C, and bringing-up section temperature is 1020 ~ 1180 DEG C, soaking zone temperature Degree is 1020 ~ 1200 DEG C;
(5) start rolling temperature of the milling step steel be 900~1020, into final rolling temperature be 830~900, finish rolling totally 14 ~ 27 Passage, and overall compression ratio 119 ~ 850;
(6) cooling step is cooling using temperature control, opens cooling blower and is rapidly cooled, laying temperature control 830 ~ 940 DEG C, then natural cooling or Slow cooling.
In technical solution of the present invention, rolling and cooling technique principle and main technologic parameters control reason for this is that:
Controlled rolling and controlled cooling basic technology principle exactly combines steel thermal deformation with phase transformation, can increase substantially the comprehensive of steel Close mechanical property.Using cooling controlling and rolling controlling process, pass through rolling temperature control, deflection, cooling temperature, cooling velocity, to steel Working hardening and phase transformation strengthening are carried out, screw thread hardness of steel can be improved and improve screw-thread steel plasticity and toughness, in course of hot rolling In to billet heating temperature, start rolling temperature, deflection carry out rationally control into final rolling temperature and spinning cooling temperature, can refine Ferritic difficult to understand, ferrite crystal grain improve screw thread steel mechanical property by strengthening mechanism.Controlling cold free-revving engine is exactly to pass through cooling, In the intensity for not reducing toughness of material and further increasing steel, the steel after rolling are in Ovshinsky topic recrystallization state, mechanical property Can be lower, therefore there is still a need for control coolings after rolling further to control tissue.
Technical solution provided by the invention, by carrying out alloying, refining furnace fine tuning in argon station processing addition ferro-silicon nitride Ingredient and temperature, slab hot sending in time after continuous casting, the ferro-silicon nitride of addition since the affinity of V and N is greater than the affinity of V and C, VN is more easily formed in conjunction with the N in steel, is not added V in the steel of nitride and is largely solid-solution in ferrite matrix, it is big in steel The microalloy element of amount does not play the role of precipitation strength and crystal grain is inhibited to grow up, and causes V waste big, thus, addition nitridation After ferrosilicon, a large amount of V is precipitated to form VN, VC alloy, to increase the precipitation enhancement and Grain refinement of V.
The HRB600 high-strength hot rolled ribbed steel bar of described plus ferro-silicon nitride of the invention has the advantages that
(1) present invention carries out microalloy treatment to reinforcing bar using nitrogen using addition ferro-silicon nitride in terms of composition design, leads to Addition ferro-silicon nitride microalloying is crossed, the grain size after VN alloy optimization is more tiny more than the grain size after V alloy change Even, rank more meets the requirements.
(2) microscopic structure of the hot rolled ribbed bars is ferrite and pearlite, after joined ferro-silicon nitride, N in steel Content increases, hence it is evident that has refined crystal grain, has improved the obdurability of HRB600.
(3) the high intensity HRB600 hot rolled ribbed bars, diameter are 6 ~ 16mm, have high intensity, stable mechanical property Feature.Wherein yield strength >=640MPa, tensile strength >=860MPa, elongation percentage >=18% meet user to hot-rolled strip rib steel Muscle high-yield strength, high-tensile, the requirement of high-elongation.
(4) hot rolled ribbed bars of the present invention substitute VN alloy, reduce by adding ferro-silicon nitride, part in molten steel Great amount of cost is saved in the use of VN alloy, and production process is simple, is easy to be produced in batches.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is a kind of metallographic structure figure for the HRB600 high-strength hot rolled ribbed steel bar for adding ferro-silicon nitride of the present invention;
Fig. 2 is a kind of stream of one embodiment of manufacturing method for the HRB600 high-strength hot rolled ribbed steel bar for adding ferro-silicon nitride of the present invention Journey schematic diagram.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row His property includes, so that the process, method, article or the system that include a series of elements not only include those elements, and And further include other elements that are not explicitly listed, or further include for this process, method, article or system institute it is intrinsic Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do There is also other identical elements in the process, method of element, article or system.
Following serial numbers of the embodiment of the present invention are for illustration only, do not represent the advantages or disadvantages of the embodiments.
Herein, the use of word first, second, and third does not indicate any sequence.It can be by these word solutions It is interpreted as title.
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
Proposed by the present invention a kind of plus ferro-silicon nitride HRB600 high-strength hot rolled ribbed steel bar, component and weight percent Include: than content
C:0.24~0.28%, Si:0.50~0.80%, Mn:1.40~1.60%, P≤0.018%, S≤0.016%, Nb:0.015 ~0.020%, V:0.130 ~ 0.170%, N:0.007 ~ 0.008%, and meet carbon equivalent Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15≤0.54%, remaining is Fe and inevitable impurity.
The effect and control of each component have the feature that in the present invention
C: carbon influences the intensity, toughness of steel, welding performance and smelting cost very big.Carbon mainly plays solution strengthening work in steel With, be for strengthening the most suitable element of steel, if but carbon content it is excessively high, the plasticity and toughness of steel will be reduced, especially damaged The welding performance of steel.To reach yield strength in the best match of the intensity and plasticity of 620MPa or more, the reasonable model of C of the present invention It is trapped among 0.24~0.28%.
The affinity of Si and carbon is very weak, the not carburet in steel, but can dissolve in ferrite, generates solution strengthening effect, So that ferritic intensity and hardness improve, but plasticity and toughness are declined.When Si too high levels, rolling process oxygen is caused Change iron sheet to be difficult to eliminate, influences surface quality of steel, the scope control of Si of the present invention is 0.50~0.80%.
Mn:Mn can reduce γ → α phase transition temperature, and the reduction of γ → α phase transition temperature has carefully ferrite grain size Change effect.In addition, the element of Mn or stronger solution strengthening, often by as the main alloy element for improving steel strength And it is widely used.Therefore select Mn as one of main intensified element of high strength cast iron, content is between 1.40~1.60%.
Nb: niobium can significantly improve the austenite recrystallization temperature of steel, expand Unhydrated cement range, be easy to implement high temperature Rolling.Niobium can also inhibit Austenite Grain Growth, have significant ground refined crystalline strengthening and precipitation strength effect, be conducive to improve tough Property.But the limit value and heating temperature by C content are influenced, and excessively high Nb can not be dissolved, and deteriorate welding performance.The present invention Nb control content 0.015~0.020%.
The compound of V:V is only precipitated in γ/α phase transition process or after phase transformation, and precipitate is very tiny, has very significant Precipitating reinforcing effect.If but adding too much, the toughness and welding performance of material can be reduced, the present invention controls content and exists 0.13~0.170%。
P and S: belonging to steel grade nocuousness tramp element, easily forms the defects of being mingled with, being segregated, and influences steel elongation percentage, welding Property.The present invention controls P≤0.045%, S≤0.045%.
N: control N:0.007 ~ 0.008% utilizes shape in some ordinary low-alloy steels containing Al, V, Nb and containing N Make ferrite in matrix strengthening at special nitride and refine crystal grain, the intensity and toughness of steel can significantly improve.
Ceq: carbon equivalent Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15 is one for evaluating welded steel performance Important indicator.The low welding performance for being conducive to steel of Ceq, the present invention control Ceq≤0.54%.
According to the high-strength hot-rolled band of HRB600 for adding ferro-silicon nitride described in said components and weight percent content manufacture Rib reinforcement, by carrying out alloying in argon station processing addition ferro-silicon nitride, refining furnace is finely tuned ingredient and temperature, is cast in time after continuous casting Base hot sending, affinity of the ferro-silicon nitride of addition due to the affinity of V and N greater than V and C, it is easier to be formed in conjunction with the N in steel VN does not add V in the steel of nitride and is largely solid-solution in ferrite matrix, and a large amount of microalloy element does not play heavy in steel Form sediment and strengthen and inhibit the effect grown up of crystal grain, cause V waste big, thus, after adding ferro-silicon nitride, a large amount of V be precipitated to be formed VN, VC alloy, to increase the precipitation enhancement and Grain refinement of V.Fig. 1, which is that the present invention is a kind of, adds ferro-silicon nitride The metallographic structure figure of HRB600 high-strength hot rolled ribbed steel bar.Described plus ferro-silicon nitride the high-strength hot rolled ribbed steel of HRB600 Muscle, diameter 6,10,16mm have high intensity, stable mechanical property feature.Wherein yield strength >=640MPa, tensile strength >=860MPa, elongation percentage >=18% meet user to hot rolled ribbed bars high-yield strength, high-tensile, high-elongation It is required that.
The present invention also proposes the manufacturing method of a kind of plus ferro-silicon nitride HRB600 high-strength hot rolled ribbed steel bar, and Fig. 2 is A kind of flow diagram of one embodiment of manufacturing method for the HRB600 high-strength hot rolled ribbed steel bar for adding ferro-silicon nitride of the present invention, Include the following steps:
In addition, to achieve the above object, the present invention proposes a kind of plus ferro-silicon nitride HRB600 high-strength hot rolled ribbed steel bar Manufacturing method includes the following steps: that converter → Argon → refining → continuous casting → red send → blank examination → heating → rolling → cold But → packaging → inspection → storage, specifically:
S10, the converter step is in furnace bottom top top-bottom blowing;
S20, the Argon step carry out alloying in argon station processing addition ferro-silicon nitride, add the alloy smeltings such as ferro-silicon nitride, Ensure that alloy is sufficiently uniformly dissolved;
S30, the refinement step finely tune ingredient and temperature in refining furnace, in smelting strict control C, Si, Mn, P, S, Nb, V at Divide and guarantee Ceq in control range, while strict control molten steel out-station temperature keeps casting machine pulling rate constant;
S40, the heating stepses slab preheating temperature are 600 ~ 850 DEG C, and bringing-up section temperature is 1020 ~ 1180 DEG C, soaking zone temperature Degree is 1020 ~ 1200 DEG C;
S50, the start rolling temperature of the milling step steel are 900~1020, and final rolling temperature is 830~900, finish rolling totally 14 ~ 27 Passage, and overall compression ratio 119 ~ 850;
S60, the cooling step is cooling using temperature control, opens cooling blower and is rapidly cooled, laying temperature control 830 ~ 940 DEG C, then natural cooling or Slow cooling.
Add the HRB600 of ferro-silicon nitride high-intensitive using described in above-mentioned elemental constituent content and the manufacture of processing technology step Hot rolled ribbed bars, diameter 6,10,16mm have high intensity, stable mechanical property feature.Wherein yield strength >= 640MPa, tensile strength >=860MPa, elongation percentage >=18% meet user to hot rolled ribbed bars high-yield strength, high tensile Intensity, the requirement of high-elongation.
Technical solution of the present invention is described in further detail below in conjunction with specific embodiments and the drawings, it should be understood that Following embodiment is only used to explain the present invention, is not used in the restriction present invention.
The component and its weight percent content of described a kind of plus ferro-silicon nitride HRB600 high-strength hot rolled ribbed steel bar Are as follows:
C:0.24~0.28%, Si:0.50~0.80%, Mn:1.40~1.60%, P≤0.018%, S≤0.016%, Nb:0.015 ~0.020%, V:0.130 ~ 0.170%, N:0.007 ~ 0.008%, and meet carbon equivalent Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15≤0.54%, remaining is Fe and inevitable impurity.
The step of manufacturing method of described a kind of plus ferro-silicon nitride HRB600 high-strength hot rolled ribbed steel bar are as follows:
A kind of manufacturing method of the HRB600 high-strength hot rolled ribbed steel bar of plus ferro-silicon nitride includes the following steps: converter → blow Argon → refining → continuous casting → red send → blank examination → heating → rolling → cooling → packaging → inspection → storage, specifically:
S10, the converter step is in furnace bottom top top-bottom blowing;
S20, the Argon step carry out alloying in argon station processing addition ferro-silicon nitride, add the alloy smeltings such as ferro-silicon nitride, Ensure that alloy is sufficiently uniformly dissolved;
S30, the refinement step finely tune ingredient and temperature in refining furnace, strict control in smelting, C, Si, Mn, P, S, Nb, V ingredient simultaneously guarantees Ceq in control range, while strict control molten steel out-station temperature keeps casting machine pulling rate constant;
S40, the heating stepses slab preheating temperature are 600 ~ 850 DEG C, and bringing-up section temperature is 1020 ~ 1180 DEG C, soaking zone temperature Degree is 1020 ~ 1200 DEG C;
S50, the start rolling temperature of the milling step steel are 900~1020, are 830~900 into final rolling temperature, finish rolling totally 14 ~ 27 A passage, and overall compression ratio 119 ~ 850;
S60, the cooling step is cooling using temperature control, opens cooling blower and is rapidly cooled, laying temperature control 830 ~ 940 DEG C, then natural cooling or Slow cooling.
In practical applications, different according to reinforcing bar production specification and batch, in control range different component content, Concrete technology control condition and corresponding mechanical performance index, in order to be better described and explain the present invention, table 1,2 and of table By component, process conditions and the mechanical property sieve of example (steel grade of the present invention) and comparative example (existing steel grade) in table 3 It lists and compares.
The chemical constituent table (wt%) of 1 the embodiment of the present invention of table and comparative example
The process control parameter list of 2 embodiment of the present invention of table and comparative example
The mechanical property list of 3 embodiment of the present invention of table and comparative example
From table 1, into table 3, for data it is found that the present invention is by carrying out alloying in argon station processing addition ferro-silicon nitride, refining furnace is micro- It is tuned into point and temperature, slab hot sending in time after continuous casting, the ferro-silicon nitride of addition is affine greater than V and C due to the affinity of V and N Power, it is easier to form VN in conjunction with the N in steel, not add V in the steel of nitride and be largely solid-solution in ferrite matrix, in steel A large amount of microalloy element does not play the role of precipitation strength and crystal grain is inhibited to grow up, and causes V waste big, thus, add nitrogen After SiClx iron, a large amount of V is precipitated to form VN, VC alloy, to increase the precipitation enhancement and Grain refinement of V.Add After ferro-silicon nitride, V content reduces by 0.010%, presses 300,000 yuan/ton of VN alloy, 10,000 yuan/ton of ferro-silicon nitride calculating, ton steel drops About 20 yuan of low-alloy cost.Described plus ferro-silicon nitride HRB600 high-strength hot rolled ribbed steel bar, diameter are 6 ~ 16mm, have height Intensity, stable mechanical property feature.Wherein yield strength >=640MPa, tensile strength >=860MPa, elongation percentage >=18% meet User is to hot rolled ribbed bars high-yield strength, high-tensile, the requirement of high-elongation.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all at this Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly It is included in other related technical areas in scope of patent protection of the invention.

Claims (4)

1. a kind of HRB600 high-strength hot rolled ribbed steel bar of plus ferro-silicon nitride, it is characterised in that: the component of the reinforcing bar and again Amount degree includes: C:0.24~0.28%, Si:0.50~0.80%, Mn:1.40~1.60%, and P≤0.018%, S≤ 0.016%, Nb:0.015~0.020%, V:0.130 ~ 0.170%, N:0.007 ~ 0.008%, and meet carbon equivalent Ceq=C+ Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15≤0.54%, remaining is Fe and inevitable impurity.
2. according to claim 1 a kind of plus ferro-silicon nitride HRB600 high-strength hot rolled ribbed steel bar, it is characterised in that: Yield strength >=640MPa under the hot rolled ribbed bars room temperature, tensile strength >=860MPa, elongation percentage >=18%.
3. according to claim 1 a kind of plus ferro-silicon nitride HRB600 high-strength hot rolled ribbed steel bar, it is characterised in that: The diameter of the reinforcing bar is 6 ~ 16mm.
4. the system of a kind of described in claims 1 to 3 any one plus ferro-silicon nitride HRB600 high-strength hot rolled ribbed steel bar Make method, characterized by the following steps: converter → Argon → refining → continuous casting → red send → blank examination → heating → Rolling → cooling → packaging → inspection → storage, specifically:
(1) the converter step is in furnace bottom top top-bottom blowing;
(2) the Argon step carries out alloying in argon station processing addition ferro-silicon nitride, adds the alloy smeltings such as ferro-silicon nitride, really Alloy is protected to be sufficiently uniformly dissolved;
(3) refinement step finely tunes ingredient and temperature, strict control in smelting, C, Si, Mn, P, S, Nb, V in refining furnace Ingredient simultaneously guarantees Ceq in control range, while strict control molten steel out-station temperature keeps casting machine pulling rate constant;
(4) the heating stepses slab preheating temperature is 600 ~ 850 DEG C, and bringing-up section temperature is 1020 ~ 1180 DEG C, soaking zone temperature Degree is 1020 ~ 1200 DEG C;
(5) start rolling temperature of the milling step steel is 900~1020, and final rolling temperature is 830~900, finish rolling totally 14 ~ 27 roads It is secondary, and overall compression ratio 119 ~ 850;
(6) cooling step is cooling using temperature control, opens cooling blower and is rapidly cooled, laying temperature control 830 ~ 940 DEG C, then natural cooling or Slow cooling.
CN201910709677.5A 2019-08-02 2019-08-02 A kind of plus ferro-silicon nitride HRB600 high-strength hot rolled ribbed steel bar and its manufacturing method Pending CN110306116A (en)

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