CN102383042A - Microalloy HRB400E steel bar containing chrome and nitrogen and production method thereof - Google Patents
Microalloy HRB400E steel bar containing chrome and nitrogen and production method thereof Download PDFInfo
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Abstract
The invention discloses a microalloy HRB400E steel bar containing chrome and nitrogen and a production method thereof. By fully utilizing the strengthening effect and the corrosion-proof effect of chrome on the steel bar, solid solution strengthening elements, namely manganese and silicon, are partially substituted, and a microalloy element, namely vanadium or columbium is partially or fully substituted; a cheap nitrogen element is used for performing microalloy treatment on the steel bar, so that the micro nitrogen separating strengthening effect is achieved; by the production method, the HRB400E steel bar can be produced; Rel of the steel bar is 430 to 490MPa, Rm of the steel bar is 570 to 650 MPa, A is 24 to 35 percent, Rm/Rel is 1.30 to 1.40, the cold bending qualified rate is 100 percent, the welding carbon equivalent weight is less than or equal to 0.45, and the comprehensive cost of one ton of the steel bar is 20 to 80 yuan lower than that of one ton the steel bar produced by the conventional method; during aging of three months, the fluctuations of the Rm value and the Rel value are less than 10MPa; the welding performance is excellent; and the steel bar has good corrosion-proof property.
Description
Technical field
The present invention relates to a kind of chromium nitrogen microalloying reinforcing bar and production technique thereof of containing, relate in particular to a kind of HRB400E reinforcing bar and production technique thereof that contains chromium and the processing of nitrogen microalloying.
Background technology
At present, other reinforcing bar of HRB400MPa level has the three major types production technique.One type is mainly to design as the carbon manganese steel set member of basic ingredient with 20MnSi, and adopting manganese system and silicon is that iron alloy carries out manganese and alloying with silicon, carries out vanadium micro-alloying with vanadium iron or VN alloy; Or utilize ferrocolumbium to carry out Nb-microalloying, and its staple control [Mn] is between 1.2-1.6%, and [Si] is between 0.40-0.60%; [C] between 0.17-0.25%, [V] is controlled between the 0.04-0.12% or [Nb] is controlled between the 0.03-0.08%, ys (Rel) >=400MPa; Tensile strength >=550MPa, relative reduction in area (A) >=16% mainly relies on carbon, manganese and silicon solution strengthening and vanadium or niobium with the carbonitride precipitation strength; This method is the most traditional and the most sophisticated method for producing steel bar; Its constant product quality, use properties is good, and shock resistance is good.But there is following problem in this method: 1. silicomanganese and carbon content are higher, and cost of alloy raises; 2. solidify with process of cooling in be easy to generate element segregation; 3. the higher welding property of carbon equivalent is relatively poor, and vanadium or content of niobium are high, and cost of alloy is high; 4. the not obvious and mixed crystal phenomenon of surrender appears easily.Second type is that composition is controlled by lower limit, and vanadium or niobium usage quantity reduce significantly, adopts the low temperature aximal deformation value rolling, produces Ultrafine Grained Steel, and alloying constituent can reduce, with grain refining as the main means that improve reinforced steel bar strength.This method also is in commerical test at present and promotes the stage, and this method exists shortcoming to be simultaneously: 1. need increase considerably mill capacity, increase considerably facility investment and bring investment in fixed assets to increase considerably with the old milling train of transformation; 2. the reinforcing bar of producing can not adopt conventional welding, otherwise the welding zone causes reinforced steel bar strength to descend significantly because of grain growth; 3. the reinforcing bar strong flexor ratio reduces, and shock resistance reduces.The 3rd type be with Composition Control at lower limit, and seldom use vanadium or niobium, adopt and wear water after rolling and force cooling; Alloying constituent also can reduce significantly; This method is used at present comparatively general, conflicts but have like the weave construction aspect in some aspects with national standard, and there is disadvantageous effect in the reinforcing bar use properties; There is following defective simultaneously: 1. need increase and wear wetting system, increase investment; 2. the reinforcement property fluctuation is big, and aging phenomenon is serious; 3. welding property is poor; 4. the easy corrosion of reinforcing bar, the shock resistance extreme difference; 5. rebar surface and core are organized inconsistently, and tempered martensite and tempered sorbite very easily appear in the surface, exceed the national standard reinforcing bar and are organized as ferritic+pearlitic basic demand.
Summary of the invention
The object of the present invention is to provide a kind of low cost prodn high intensity levels, steady quality and receive market to hold the HRB400E high intensity levels reinforcing bar and the working method thereof of welcoming.
For realizing above-mentioned purpose, the technical scheme that the present invention adopts is:
A kind of working method that contains chromium nitrogen microalloying HRB400E reinforcing bar is with blast-melted, and one or both in perhaps blast-melted and steel scrap or the pig join oxygen blast melting in the converter, perhaps join in the electric furnace oxygen blast and send electric smelting, and the adding slag former; May further comprise the steps:
1) when Converter Oxigen Blowing is smelted 3-12min, or electric furnace adds reductibility chromic oxide pelletizing, perhaps the mixture of reductibility chromic oxide pelletizing and reductibility manganese oxide pelletizing when adding the pig iron or steel scrap;
2) before converter tapping in the 3-8min, add in reductibility vanadium oxide pelletizing and the reductibility niobium oxides pelletizing one or both; Or in ladle, add in reductibility vanadium oxide pelletizing and the reductibility niobium oxides pelletizing one or both during electric furnace steel tapping;
3) 30-100 in second behind converter tapping; Add one or more the combination in Mn series alloy, the manganese metal according to the Mn content target in the smelting endpoint molten steel, add one or more the combination in Si system alloy, Pure Silicon Metal, the silit according to the Si content target in the smelting endpoint molten steel; According to the carbon content in the smelting endpoint molten steel and consider that other alloys bring carbon content into and add carburelant;
Or according to the content of electric furnace molten steel through silicon and manganese in the molten steel after the LF refining; In the LF refining furnace, add one or more the combination in Si system alloy, Pure Silicon Metal, the silit; Finely tune the content of silicon and manganese with one or more the combination in Mn series alloy, the manganese metal, make that the quality percentage composition ratio of silicon and manganese reaches target in the molten steel, and according to the carbon content of LF stove molten steel with consider that alloy brings carbon content into; Add carburelant, make that the mass percentage content of carbon reaches target in the molten steel;
Described Mn series alloy comprises that manganeseirom, silicomanganese, manganess carbide etc. contain the alloy of manganese metal;
Described Si system alloy comprises that ferro-silicon, silicomanganese etc. contain the alloy of silicon;
4) in the converter tapping process with molten steel air blowing stirring station; Under the microwave field condition; Molten steel nitrogen blowing in ladle or add one or more the combination in silicon nitrogen alloy (alloy that promptly contains silicon nitrogen), vanadium nitride, silicon nitride, nitrogenize silicomanganese, nitrogenized manganese, the chromium nitride makes that nitrogen content reaches target in the molten steel;
Perhaps in the LF of electric furnace refining station, under the microwave field condition, the molten steel nitrogen blowing in ladle or add one or more the combination in silicon nitrogen alloy, vanadium nitride, silicon nitride, nitrogenize silicomanganese, nitrogenized manganese, the chromium nitride makes that nitrogen content reaches target in the molten steel;
Through after the above-mentioned steps; Various element mass percentage content targets are following in the final control molten steel: 0.60wt%≤Mn≤1.0wt%, 0.25wt%≤Si≤0.50wt%, 0.30wt%≤Gr＜0.60wt%; 0.17wt%≤C≤0.25wt%, 0.007wt%≤N＜0.0120wt%;
Contain in the molten steel and satisfy 0.010wt%≤V＜0.045wt% when V does not contain Nb,
Contain in the molten steel and satisfy 0.010wt%≤Nb＜0.045wt% when Nb does not contain V,
Satisfy 0.010wt%≤V+Nb＜0.040wt% when containing V and Nb simultaneously;
5) pouring molten steel becomes steel billet, through process furnace heating, rolling cooling.
Can also make steel chromium in the water, vanadium and content of niobium according to converter smelting endpoint in the above-mentioned production process; During tapping in adding ferro-vanadium, VN alloy, vanadium metal, ferrocolumbium, metal niobium, ferro-chromium, chromium metal, chromium carbide, the chromium nitride one or more; Chromium, vanadium and content of niobium in the fine setting molten steel make above-mentioned each element quality percentage composition than all reaching target; Or according to electric furnace steel tapping after chromium, vanadium and content of niobium in the molten steel after the refining of LF stove; In adding ferro-vanadium, VN alloy, vanadium metal, ferrocolumbium, metal niobium, ferro-chromium, chromium metal, chromium carbide, the chromium nitride one or more; Chromium, vanadium and content of niobium in the fine setting molten steel make above-mentioned each element all reach the quality percentage composition and compare target.
Described reductibility manganese oxide pelletizing is to form through low-temperature sintering after joining carbon in the manganese oxide ore, and reductibility chromic oxide pelletizing is to form through low-temperature sintering after joining carbon in the oxidation chrome ore, and reductibility vanadium oxide pelletizing is V
2O
5Low-temperature sintering forms after joining carbon in the process, and reductibility niobium oxides pelletizing is Nb
2O
5Joining the carbon low-temperature sintering in the process forms.
The combination of one or more in described carburelant type of being graphite, refinery coke, carbon dust, silit, the carbide of calcium.
Said molten iron is in the molten iron of 0.10-0.50% one or both of general common molten iron and chrome content.
Nitrogen blowing intensity described in the step 4) is 0.02-0.3m
3/ min.t steel, the nitrogen blowing time is controlled at 3-10min.
Molten steel pours into steel billet through continuous caster in the step 5), and through the process furnace heating, Heating temperature is between 900-1200 ℃; Start rolling temperature is between 850-1120 ℃; Finishing temperature is rolled laggard line space cooling between 850-1050 ℃, or rolls back reinforcing bar employing and wear water cooling; Controlled chilling discharge and pressure make that the cold bed tempering temperature is controlled between 780-850 ℃ on the reinforcing bar.
It is a kind of that to contain chromium nitrogen microalloying HRB400E reinforcing bar be that the molten steel that contains the various elements of following mass content is prepared from: 0.60wt%≤Mn≤1.0wt%; 0.25wt%≤Si≤0.50wt%; 0.30wt%≤Gr＜0.60wt%; 0.17wt%≤C≤0.25wt%, 0.007wt%≤N＜0.0120wt%;
Contain in the molten steel and satisfy 0.010wt%≤V＜0.045wt% when V does not contain Nb,
Contain in the molten steel and satisfy 0.010wt%≤Nb＜0.045wt% when Nb does not contain V,
Satisfy 0.010wt%≤V+Nb＜0.040wt% when containing V and Nb simultaneously.
Performance satisfies: Rel is between 430-490MPa, and Rm is between 570-650MPa, and A is between 24-35%, and Rm/Rel is between 1.30-1.40, and the clod wash qualification rate is 100%, welding carbon equivalent≤0.45.
The present invention makes full use of strengthening effect and the preservative activity of chromium to reinforcing bar; Part replaces solution strengthening element manganese and silicon; Utilizing cheap nitrogen element that reinforcing bar is carried out microalloying simultaneously handles; Bring into play trace nitrogen precipitation strength effect, reduce the consumption of strategic noble metal element such as vanadium, niobium etc. significantly, realize low cost prodn high intensity levels, steady quality and receive market to hold the HRB400E high intensity levels reinforcing bar of welcoming.Produce under the equipment condition at existing reinforcing bar,, adopt direct alloy alloying of reductibility acid pellet and the smelting technology that adopts iron alloy fine setting composition with carbon manganese set member system; Utilize microwave field ionized nitrogen molecule, through bottom blowing nitrogen or add the nitrogen pick-up alloy molten steel is carried out the nitrogen microalloying, its Rel of HRB400E grade reinforcing steel that produces with this method is between 430-490MPa; Rm is between 570-650MPa; A is between 24-35%, and Rm/Rel is between 1.30-1.40, and the clod wash qualification rate is 100%; Three months timeliness, Rel and Rm value undulating quantity are less than 10MPa, and welding property is good; Comprehensive cost reduces 20-80 unit/ton than traditional method; Utilize the existing weaponry and equipment condition, need not carry out new equipment input.
Embodiment
Below in conjunction with embodiment the present invention is made further detailed description, and can not limit the present invention.
The present invention can adopt oxygen coverter smelting-continuous casting-rolling technology, also can adopt electrosmelting-continuous casting-rolling technology.The present invention adopts oxygen coverter smelting-continuous casting-rolling technology to implement.
Embodiment 1
With blast-melted, join in the converter oxygen blast melting respectively with steel scrap or pig; And add slag making materials such as lime, when Converter Oxigen Blowing is smelted 8min, add the mixture of reductibility chromic oxide pelletizing and reductibility manganese oxide pelletizing; Top blast oxygen 5min, bottom blowing 5min simultaneously makes in the smelting endpoint molten steel between [C]=0.12-0.20%; [Mn] between 0.15-0.25%, [Gr] is between 0.15-0.25%;
Before converter tapping, in the 3min, add reductibility vanadium oxide pelletizing; Oxygen blast gas 3min, bottom blowing gas 3min simultaneously, between 0.005-0.01%, other compositions such as molten steel sulphur content are less than 0.040% to make in the molten steel [V], and phosphorus content satisfies standard-required less than 0.040% grade, and temperature satisfies the continuous casting process requirement condition under taps;
In back 30 seconds of tapping, add manganeseirom according to the Mn content in the smelting endpoint molten steel, make in the molten steel manganese content between 0.60-0.70%; Add Pure Silicon Metal according to the Si content in the smelting endpoint molten steel; Make in the molten steel silicone content between 0.20-0.30%, according to aim carbon content and consider that other alloys bring carbon content into, add a carburelant carbon dust and a type graphite; Make in the molten steel [C] between 0.20-0.25%
In tapping process and molten steel air blowing whipping process, through microwave field nitrogen blowing in ladle molten steel, make [N] content in the molten steel between 0.007-0.008%, nitrogen blowing intensity is 0.03m
3/ min.t steel, the nitrogen blowing time is controlled at 10min; Add vanadium iron mid-term in tapping [V] in the molten steel finely tuned, make [V] in the molten steel between 0.010-0.0150%.
According to the Gr content in the smelting endpoint molten steel, add ferro-chromium during tapping, make in the molten steel chromium content between 0.30-0.40%; Pouring molten steel becomes steel billet, and steel billet is rolled into the steel of different size model then through the process furnace heating; Heating temperature is between 1000-1100 ℃, and start rolling temperature is between 950-1050 ℃, and finishing temperature is between 950-1000 ℃; Wear water cooling after rolling; Controlled chilling discharge and pressure make that the cold bed tempering temperature is controlled between 780-800 ℃ on the reinforcing bar, according to customer requirements cutting to length packing warehouse-in.
This reinforcing bar chemical ingredients is: C=0.24%, Mn=0.63%, Gr=0.33%, Si=0.27%, N=0.0076%, V=0.013%.Performance index are following; Rel=460MPa, Rm=615MPa, A=28.5%, Rm/Rel=1.339, clod wash is qualified, and the welding carbon equivalent is less than 0.40.Comprehensive cost reduces by 76.7 yuan/ton.
Embodiment 2
With blast-melted, join respectively in the converter with steel scrap or pig, the oxygen blast melting, and add slag making materials such as lime,, Converter Oxigen Blowing adds the mixture of reductibility chromic oxide pelletizing and reductibility manganese oxide pelletizing when smelting 11min; Between 0.08-0.15%, [Mn] between 0.30-0.40%, [Gr] is between 0.30-0.40% to make in the smelting endpoint molten steel [C];
Before converter tapping, in the 8min, add reductibility vanadium oxide pelletizing and reductibility niobium oxides pelletizing; Oxygen blast gas 8min, the gas of bottom blowing simultaneously 8min makes [V] in the molten steel+[Nb] between 0.025-0.035%, and other compositions satisfy the standard-required tapping;
Less than 0.040%, phosphorus content is less than 0.040% in the converter molten steel sulphur content, and temperature satisfies tapping under the continuous casting process requirement condition.In back 60 seconds of tapping; Add silicomanganese according to the Mn content in the smelting endpoint molten steel; Make in the steel manganese content between 0.90-1.00%, add ferro-silicon, make in the steel silicone content at 0.40-0.50% according to the Si content in the smelting endpoint molten steel; According to aim carbon content and consider that other alloys bring carbon content into and add carburelant silit, make in the steel carbon content between 0.21-0.25%;
In tapping process and molten steel air blowing whipping process, add nitrogenize silicomanganese and chromium nitride alloy, make in the molten steel nitrogen content between 0.0110-0.0120%;
According to chromium, vanadium and content of niobium in the converter smelting endpoint steel-making water, add chromium, vanadium and content of niobium in ferrochrome, vanadium iron, the ferrocolumbium fine setting molten steel during tapping, make that chromium content is between 0.50-0.60% in the molten steel, V+Nb content is between 0.030-0.040%.
Pouring molten steel becomes steel billet, and steel billet is rolled into the steel of different size model then through the process furnace heating; Heating temperature is between 900-1000 ℃, and start rolling temperature is between 850-950 ℃, and finishing temperature is between 850-900 ℃; It is cold to roll laggard line space, according to customer requirements cutting to length packing warehouse-in.
This reinforcing bar chemical ingredients is: C=0.24%, Mn=0.97%, Gr=0.57%, Si=0.47%, N=0.0116%, V+Nb=0.038%.Performance index are following; Rel=465MPa, Rm=620MPa, A=32.5%, Rm/Rel=1.33, clod wash is qualified, and the welding carbon equivalent is less than 0.45.Comprehensive cost reduces by 28.1 yuan/ton
Embodiment 3
With blast-melted, join in the converter oxygen blast melting respectively with steel scrap or pig; And add slag making materials such as lime, when Converter Oxigen Blowing is smelted 3min, add the mixture of reductibility chromic oxide pelletizing and reductibility manganese oxide pelletizing; Top blast oxygen 6min, bottom blowing 6min simultaneously makes in the smelting endpoint molten steel between [C]=0.10-0.15%; [Mn] between 0.30-0.40%, [Gr] is between 0.25-0.35%;
Before converter tapping, in the 5min, add reductibility niobium oxides pelletizing; Oxygen blast gas 5min, bottom blowing gas 5min simultaneously, between 0.020-0.030%, other compositions such as molten steel sulphur content are less than 0.040% to make in the molten steel [Nb], and phosphorus content satisfies standard-required less than 0.040% grade, and temperature satisfies the continuous casting process requirement condition under taps;
In back 60 seconds of tapping; Add silicomanganese according to the Mn content in the smelting endpoint molten steel, make that manganese content adds ferro-silicon according to the Si content in the smelting endpoint molten steel in the molten steel between 0.80-0.90%; Make in the molten steel silicone content between 0.35-0.45%; According to aim carbon content and consider that other alloys bring carbon content into and add carburelant carbide of calcium and coke, make in the molten steel [C] between 0.18-0.25%
In tapping process and molten steel air blowing whipping process, through microwave field nitrogen blowing in ladle molten steel, make [N] content in the molten steel between 0.008-0.010%, nitrogen blowing intensity is the 0.3m3/min.t steel, the nitrogen blowing time is controlled at 3min; Add ferro-niobium mid-term in tapping and make that [Nb] finely tunes in the molten steel, make [Nb] in the molten steel between 0.0350-0.0450%.
According to the Gr content in the smelting endpoint molten steel, during tapping, add chromium alloy and make chromium content between 0.40-0.50%;
According to institute's steel rolling muscle diameter and scale requirement, pouring molten steel is become the steel billet of different section size, steel billet to send through heat or cools off the back to get into the process furnace heating; Heating temperature is between 1150-1250 ℃, and start rolling temperature is between 1100-1150 ℃, and finishing temperature is between 1050-1100 ℃; Roll the back air cooling; Set the rolling load of each passage according to strand size and bar gauge, reinforcing bar cuts into the scale of regulation by customer need through cooling off after, and test package is put in storage.
This reinforcing bar chemical ingredients is: C=0.21%, Mn=0.86%, Gr=0.48%, Si=0.41%, N=0.0085%, Nb=0.041%.Performance index are following; Rel=455MPa, Rm=615MPa, A=24.5%, Rm/Rel=1.35, clod wash is qualified, and the welding carbon equivalent is less than 0.45.Comprehensive cost reduces by 42.3 yuan/ton.
Embodiment 4
With blast-melted, join respectively in the converter with steel scrap or pig, oxygen blast or energising melting, and add slag making materials such as lime,, Converter Oxigen Blowing adds the mixture of reductibility chromic oxide pelletizing and reductibility manganese oxide pelletizing when smelting 8min; Between 0.10-0.15%, [Mn] between 0.40-0.50%, [Gr] is between 0.40-0.50% to make in the smelting endpoint molten steel [C];
Before converter tapping, in the 5min, add reductibility niobium oxides pelletizing; Oxygen blast gas 5min, bottom blowing gas 5min simultaneously, between 0.005-0.010%, other compositions satisfy the standard-required tapping to make in the molten steel [Nb];
Less than 0.040%, phosphorus content is less than 0.040% in the converter molten steel sulphur content, and temperature satisfies tapping under the continuous casting process requirement condition.In back 90 seconds of tapping; Add silicomanganese according to the Mn content in the smelting endpoint molten steel; Make in the steel manganese content between 0.90-1.00%, add ferro-silicon, make in the steel silicone content at 0.30-0.40% according to the Si content in the smelting endpoint molten steel; According to aim carbon content and consider that other alloys bring carbon content into and add a carburelant silit and a type graphite, make in the steel carbon content between 0.20-0.25%;
In tapping process and molten steel air blowing whipping process, add chromium nitride, ferro-silicon nitride, make in the molten steel nitrogen content between 0.0110-0.0120%;
According to chromium, content of niobium in the converter smelting endpoint steel-making water, add chromium and content of niobium in ferrochrome, the ferrocolumbium fine setting molten steel during tapping, make that chromium content is between 0.50-0.60% in the molten steel, Nb content is between 0.010-0.015%.
Pouring molten steel becomes steel billet, and steel billet is rolled into the steel of different size model then through the process furnace heating; Heating temperature is between 1050-1150 ℃, and start rolling temperature is between 1050-1100 ℃, and finishing temperature is between 1000-1050 ℃; Wear water cooling after rolling; Controlled chilling discharge and pressure make that the cold bed tempering temperature is controlled between 800-850 ℃ on the reinforcing bar, according to customer requirements cutting to length packing warehouse-in.
This reinforcing bar chemical ingredients is: C=0.24%, Mn=0.92%, Gr=0.52%, Si=0.33%, N=0.0112%, Nb=0.012%.Performance index are following; Rel=450MPa, Rm=610MPa, A=27.5%, Rm/Rel=1.36, clod wash is qualified, and the welding carbon equivalent is less than 0.45.Comprehensive cost reduces by 68.3 yuan/ton
Embodiment 5
With blast-melted, steel scrap and pig join the interior oxygen blast of electric furnace and send electric smelting, and add slag former;
When electric furnace adds the pig iron or steel scrap, add the mixture of reductibility chromic oxide pelletizing and reductibility manganese oxide pelletizing;
In ladle, add reductibility vanadium oxide pelletizing during electric furnace steel tapping;
Content according to silicon and manganese in the molten steel after the electric furnace molten steel process LF refining; In the LF refining furnace, add silit and manganese metal and finely tune the content of silicon and manganese; Make that the quality percentage composition ratio of silicon and manganese reaches target in the molten steel; And according to the carbon content of LF stove molten steel with consider that alloy brings carbon content into, add the carburelant carbon dust, make that the mass percentage content of carbon reaches target in the molten steel;
In the LF of electric furnace refining station, add vanadium nitride, silicon nitride, make that nitrogen content reaches the target control area requirement in the molten steel;
At last according to institute's steel rolling muscle diameter and scale requirement, pouring molten steel is become the steel billet of different section size, steel billet send through heat or cools off the back and gets into the process furnace heating; Heating temperature is between 950-1000 ℃, and start rolling temperature is between 950-1000 ℃, and finishing temperature is between 900-950 ℃; Roll the back air cooling; Set the rolling load of each passage according to strand size and bar gauge, reinforcing bar cuts into the scale of regulation by customer need through cooling off after, and test package is put in storage.
This reinforcing bar chemical ingredients is: C=0.21%, Mn=1.0%, Gr=0.58%, Si=0.45%, N=0.011%, V=0.035%.Performance index are following; Rel=485MPa, Rm=630MPa, A=25%, Rm/Rel=1.35, clod wash is qualified, and the welding carbon equivalent is less than 0.45.Comprehensive cost reduces by 48.8 yuan/ton.
Claims (9)
1. working method that contains chromium nitrogen microalloying HRB400E reinforcing bar; Be with blast-melted; In perhaps blast-melted and steel scrap or the pig one or both join oxygen blast melting in the converter, and perhaps join in the electric furnace oxygen blast and send electric smelting, and the adding slag former; It is characterized in that, may further comprise the steps:
1) smelt 3-12min in Converter Oxigen Blowing, or electric furnace adds reductibility chromic oxide pelletizing, perhaps the mixture of reductibility chromic oxide pelletizing and reductibility manganese oxide pelletizing when adding the pig iron or steel scrap;
2) before converter tapping in the 3-8min, add in reductibility vanadium oxide pelletizing and the reductibility niobium oxides pelletizing one or both; Or in ladle, add in reductibility vanadium oxide pelletizing and the reductibility niobium oxides pelletizing one or both during electric furnace steel tapping;
3) 30-100 in second behind converter tapping; Add one or more the combination in Mn series alloy, the manganese metal according to the Mn content target in the smelting endpoint molten steel, add one or more the combination in Si system alloy, Pure Silicon Metal, the silit according to the Si content target in the smelting endpoint molten steel; According to the carbon content in the smelting endpoint molten steel and consider that other alloys bring carbon content into and add carburelant;
Or according to the content of electric furnace molten steel through silicon and manganese in the molten steel after the LF refining; In the LF refining furnace, add one or more the combination in Si system alloy, Pure Silicon Metal, the silit; Finely tune the content of silicon and manganese with one or more the combination in Mn series alloy, the manganese metal, make that the quality percentage composition ratio of silicon and manganese reaches target in the molten steel, and according to the carbon content of LF stove molten steel with consider that alloy brings carbon content into; Add carburelant, make that the mass percentage content of carbon reaches target in the molten steel;
4) in the converter tapping process with molten steel air blowing stirring station; Under the microwave field condition; Molten steel nitrogen blowing in ladle or add one or more the combination in silicon nitrogen alloy, vanadium nitride, silicon nitride, nitrogenize silicomanganese, nitrogenized manganese, the chromium nitride makes that nitrogen content reaches target in the molten steel;
Perhaps in the LF of electric furnace refining station, under the microwave field condition, the molten steel nitrogen blowing in ladle or add one or more the combination in silicon nitrogen alloy, vanadium nitride, silicon nitride, nitrogenize silicomanganese, nitrogenized manganese, the chromium nitride makes that nitrogen content reaches target in the molten steel;
Through after the above-mentioned steps; Various element mass percentage content targets are following in the final control molten steel: 0.60wt%≤Mn≤1.0wt%, 0.25wt%≤Si≤0.50wt%, 0.30wt%≤Gr＜0.60wt%; 0.17wt%≤C≤0.25wt%, 0.007wt%≤N＜0.0120wt%;
Contain in the molten steel and satisfy 0.010wt%≤V＜0.045wt% when V does not contain Nb,
Contain in the molten steel and satisfy 0.010wt%≤Nb＜0.045wt% when Nb does not contain V,
Satisfy 0.010wt%≤V+Nb＜0.040wt% when containing V and Nb simultaneously;
5) pouring molten steel becomes steel billet, through process furnace heating, rolling cooling.
2. method according to claim 1 is characterized in that,
According to chromium, vanadium and content of niobium in the converter smelting endpoint steel-making water; During tapping in adding ferro-vanadium, VN alloy, vanadium metal, ferrocolumbium, metal niobium, ferro-chromium, chromium metal, chromium carbide, the chromium nitride one or more; Chromium, vanadium and content of niobium in the fine setting molten steel make above-mentioned each element quality percentage composition than all reaching target; Or according to electric furnace steel tapping after chromium, vanadium and content of niobium in the molten steel after the refining of LF stove; In adding ferro-vanadium, VN alloy, vanadium metal, ferrocolumbium, metal niobium, ferro-chromium, chromium metal, chromium carbide, the chromium nitride one or more; Chromium, vanadium and content of niobium in the fine setting molten steel make above-mentioned each element all reach the quality percentage composition and compare target.
3. method according to claim 1 is characterized in that,
Described reductibility manganese oxide pelletizing is to form through low-temperature sintering after joining carbon in the manganese oxide ore, and reductibility chromic oxide pelletizing is to form through low-temperature sintering after joining carbon in the oxidation chrome ore, and reductibility vanadium oxide pelletizing is V
2O
5Low-temperature sintering forms after joining carbon in the process, and reductibility niobium oxides pelletizing is Nb
2O
5Joining the carbon low-temperature sintering in the process forms.
4. method according to claim 1 is characterized in that, the combination of one or more in described carburelant type of being graphite, refinery coke, carbon dust, silit, the carbide of calcium.
5. method according to claim 1 is characterized in that, said molten iron is in the molten iron of 0.10-0.50% one or both of general common molten iron and chrome content.
6. method according to claim 1 is characterized in that, the nitrogen blowing intensity described in the step 4) is 0.02-0.3m
3/ min.t steel, the nitrogen blowing time is controlled at 3-10min.
7. method according to claim 1 is characterized in that molten steel pours into steel billet through continuous caster in the step 5); Through the process furnace heating, Heating temperature is between 900-1250 ℃, and start rolling temperature is between 850-1150 ℃; Finishing temperature is rolled laggard line space cooling between 850-1100 ℃, or rolls back reinforcing bar employing and wear water cooling; Controlled chilling discharge and pressure make that the cold bed tempering temperature is controlled between 780-850 ℃ on the reinforcing bar.
8. one kind contains chromium nitrogen microalloying HRB400E reinforcing bar; It is characterized in that; Be that the molten steel that contains the various elements of following mass content is prepared from: 0.60wt%≤Mn≤1.0wt%, 0.25wt%≤Si≤0.50wt%, 0.30wt%≤Gr＜0.60wt%; 0.17wt%≤C≤0.25wt%, 0.007wt%≤N＜0.0120wt%;
Contain in the molten steel and satisfy 0.010wt%≤V＜0.045wt% when V does not contain Nb,
Contain in the molten steel and satisfy 0.010wt%≤Nb＜0.045wt% when Nb does not contain V,
Satisfy 0.010wt%≤V+Nb＜0.040wt% when containing V and Nb simultaneously.
9. the chromium nitrogen microalloying HRB400E reinforcing bar that contains according to claim 8; It is characterized in that performance satisfies: Rel is between 430-490MPa, and Rm is between 570-650MPa; A is between 24-35%; Rm/Rel is between 1.30-1.40, and the clod wash qualification rate is 100%, welding carbon equivalent≤0.45.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09177243A (en) * | 1995-12-22 | 1997-07-08 | Tokai Kogyo Kk | Reinforcing bar rod steel with high yielding point and its manufacture |
| CN101775538A (en) * | 2010-03-24 | 2010-07-14 | 中南大学 | Technique for producing 500MPa level high-strength quake-proof reinforcing steel bar |
-
2011
- 2011-11-10 CN CN 201110354367 patent/CN102383042B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09177243A (en) * | 1995-12-22 | 1997-07-08 | Tokai Kogyo Kk | Reinforcing bar rod steel with high yielding point and its manufacture |
| CN101775538A (en) * | 2010-03-24 | 2010-07-14 | 中南大学 | Technique for producing 500MPa level high-strength quake-proof reinforcing steel bar |
Non-Patent Citations (1)
| Title |
|---|
| 许后昌等: "HRB400E抗震钢筋研制与开发", 《四川冶金》, vol. 33, no. 1, 28 February 2011 (2011-02-28) * |
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