CN104831183A - 1080MPa high-strength corrosion-resistance twisted steel for prestressed structure and preparation method of 1080MPa high-strength corrosion-resistance twisted steel - Google Patents
1080MPa high-strength corrosion-resistance twisted steel for prestressed structure and preparation method of 1080MPa high-strength corrosion-resistance twisted steel Download PDFInfo
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Abstract
The invention discloses 1080MPa high-strength corrosion-resistance twisted steel for a prestressed structure and a preparation method of the 1080MPa high-strength corrosion-resistance twisted steel. The 1080MPa high-strength corrosion-resistance twisted steel for the prestressed structure is characterized by being composed of 0.50-0.60wt% of C, 1.25-1.50wt% of Si, 1.20-1.40wt% of Mn, 0.40-0.60wt% of Cr, 0.040-0.070wt% of Mo, 0.040-0.070wt% of Ti, 0.15-0.30wt% of Ni, at most 0.010wt% of S, at most 0.015wt% of P and the rest of Fe and unavoidable impurities. The preparation method includes billet preparation, rolling, aftertreatment and the like, control of amount, size and distribution of the impurities is realized, and cracking of billets is avoided due to hot delivery of casting blanks. Due to addition of Cr, Ni and Mo alloy elements to the steel, hardenability and corrosion resistance are improved, and crack initiation is prevented. Owing to controlled rolling and cooling, grain refinement of rebar structures is realized, and ferrite network structures of core portions are reduced. The twisted steel has the advantages of high toughness, high corrosion resistance and excellent prestressing looseness and is capable of keeping stable performances in various atmospheric environments for a long term to guarantee stability in long-term use of anchored objects.
Description
Technical field
The invention belongs to metal material processing technical field, be specifically related to corrosion-resistant prestressed structure Twisted Steel of a kind of 1080MPa grade high-strength and preparation method thereof.
Background technology
Prestressed structure high-strength finish rolling deformed bar is called for short finish rolling deformed bar, and it is high that it has intensity, and connection, stretch-draw, anchoring are convenient and reliable, during construction without the need to carry out cold drawn with weld, the advantages such as easy construction.Fining twisted steel is widely used in large-scale water conservancy, the through beam of industry and covil construction and large-scale skeleton construction, the big-and-middle bridge beam of highway, railway, the engineerings such as prestressed concrete scholar structure and ground anchorage such as Nuclear power plants.
Finish rolling deformed bar chemical composition is domestic does not at present have unified component requirements, and each steel mill adopts V, Ti, Nb V-N steel technology to carry out Composition Control.Because design mix, processing units and production and processing technology are different, to produce prestress Twisted Steel surface structure be tempered sorbite, easily there is ferrite reticulattion in heart portion, cause top layer fast to centre hardness change, product causes performance inconsistency large, the deformed bar of 785MPa, 830 MPa, 930 MPa levels can only be produced, be difficult to produce mechanical property and stress relaxation ability excellent and there is the 1080MPa grade high-strength prestress Twisted Steel of corrosion resistance nature.
Summary of the invention
The first object of the present invention is to provide a kind of 1080MPa grade high-strength corrosion-resistant prestressed structure Twisted Steel; Second object is the preparation method providing the corrosion-resistant prestressed structure Twisted Steel of described 1080MPa grade high-strength.
The first object of the present invention realizes like this, comprise weight percent C:0.50 ~ 0.60 wt%, Si:1.25 ~ 1.50 wt%, Mn:1.20 ~ 1.40wt%, Cr:0.40 ~ 0.60wt%, Mo:0.040 ~ 0.070 wt%, Ti:0.040 ~ 0.070 wt%, Ni:0.15 ~ 0.30 wt%, S :≤0.010wt%, P :≤0.015wt%, all the other are Fe and inevitable impurity.
The preparation method of the corrosion-resistant prestressed structure Twisted Steel of 1080MPa grade high-strength of the present invention, comprise molten iron converter smelting, deoxidation of molten steel alloying, the refining of LF stove, VD vacuum refinement, molten steel casting, heating steel billet, steel billet controlled rolling and controlled cooling, steel post-processing step, specifically comprise:
A molten iron converter smelting: by the amount of 1060 kg/t steel, add the low-sulfur ferrophosphorus water of following masses ratio to LD converter: C 4.5 ~ 5.0wt%, Si 0.30 ~ 0.50wt%, Mn 0.25 ~ 0.50wt%, P 0.060 ~ 0.090wt%, S≤0.015wt%, all the other are Fe and inevitable impurity; By the amount of 45kg/t steel, add the smart steel scrap of following masses ratio to LD converter: C 0.17 ~ 0.25wt%, Si 0.30 ~ 0.55wt%, Mn 1.15 ~ 1.50wt%, P 0.020 ~ 0.040wt%, S 0.015 ~ 0.030wt%, all the other are Fe and inevitable impurity; By the amount of 1.30 ~ 2.80 kg/t steel, add the Rhometal of following masses ratio to LD converter: Ni 99.3wt%, all the other are Fe and inevitable impurity; After low-sulfur ferrophosphorus water, smart steel scrap, ferronickel add LD converter, carry out conventional top bottom blowing, add conventional lime, rhombspar, the slag making of magnesite ball, lime adding amount is 45 ~ 55kg/t steel, rhombspar add-on is 10 ~ 20kg/t steel, magnesite ball add-on is 5.0 ~ 7.0kg/t steel, and control endpoint carbon content >=0.12wt%, tapping temperature is 1625 ~ 1645 DEG C; Tapping forward direction ladle bottom adds quickened lime and refining slag carries out wash heat, and lime adding amount is 3.0kg/t steel, and refining slag add-on is 1.0kg/t steel, and tapping process adopts omnidistance bottom argon blowing technology, and it is 30 ~ 50NL/min that argon flow amount controls.
B deoxidation of molten steel alloying: step A molten steel is tapped, when the molten steel amount in ladle is greater than 1/5, in ladle, add following material successively: by the amount of 20.10 ~ 24.20kg/t steel, add the ferrosilicon of following masses ratio: Si 73.5wt%, all the other are Fe and inevitable impurity; By the amount of 15.50 ~ 18.50kg/t steel, add the high carbon ferromanganese alloy of following masses ratio: Mn 75.8wt%, C 7.2wt%, all the other are Fe and inevitable impurity; By the amount of 6.70 ~ 10.30kg/t steel, add the high carbon ferro-chrome of following masses ratio: Cr 57.5 wt%, C 7.6 wt%, all the other are Fe and inevitable impurity; By the amount of 0.50 ~ 0.95kg/t steel, add the ferro-molybdenum of following masses ratio: Mo 72.5wt%, Si 1.5wt%, all the other are Fe and inevitable impurity; By 2.60 ~ 3.30kg/t
steelamount, add the carburelant of following masses ratio: C 92.35wt%, S 0.085wt%, ash 4.15wt%, fugitive constituent 1.64wt%, moisture content 0.75wt%, all the other are inevitable impurity; Above-mentioned alloy and carburelant is added when ladle molten steel amount reaches 4/5; After tapping, molten steel is hung and delivers to refining station and carry out LF stove refining treatment and VD vacuum refinement process.
C molten steel LF stove refining: complete molten steel of step B being tapped winches to LF stove refining station and connects the BOTTOM ARGON BLOWING band of gas, opens argon gas and adopts little argon amount (10 ~ 20NL/min) Argon 2 minutes, make molten steel face be wriggling shape; Lower electrode adopts gear 6 ~ 8 grades to change slag afterwards, be energized after 3 minutes, lift electrode and observe stove internalization slag situation, thermometric, sampling afterwards, add lime 3.0 ~ 5.0kg/t steel, calcium carbide 0.4 ~ 0.8 kg/t steel, aluminum shot 0.2 ~ 0.6 kg/t steel carry out residue adjustment, control Oxygen Content in Liquid Steel≤0.0005wt%, by the amount of 1.60 ~ 2.90kg/t steel, add the ferrotianium of following masses ratio: Ti 31.5 wt%, all the other are Fe and inevitable impurity; Liquid steel temperature is heated to 1570 ~ 1590 DEG C by lower electrode, then adds quartz sand 180 ~ 250kg, and lower electrode is saturating by quartz sandization, and bits basicity controls by 0.8 ~ 1.2; Meanwhile, according to steel sample assay, add alloy synchronization control molten steel composition; Bitsization are good, after composition adjustment, liquid steel temperature is heated to 1600 ~ 1610 DEG C and carries out the process of soft blow argon, adopt flow to be that the little argon gas amount of 20 ~ 30NL/min was to molten steel soft blow argon 5 minutes.
D molten steel VD stove vacuum refinement: the molten steel after step C soft blow argon is hung in VD stove vacuum tank, connect Argon pipe, close vacuum container cover, carries out forvacuum 7 minutes; When vacuum is evacuated to 67Pa, starts to carry out Fruit storage, carry out BOTTOM ARGON BLOWING process simultaneously, flow control is 70 ~ 90NL/min, and time controling is 15 minutes; Close vacuum main valve, multiple pressure afterwards, promote cover, to liquid steel sampling, determine carbon, determine oxygen, determine hydrogen; Afterwards molten steel is carried out the process of soft blow argon, adopt flow to be that the little argon gas amount of 20 ~ 30NL/min was to molten steel soft blow argon 5 minutes; Carry out denaturing treatment to molten steel feeding silicon-calcium wire afterwards, feeding has the silicon-calcium wire of following masses ratio: Si 56.5wt%, Ca 29.5 wt%, all the other are Fe and inevitable impurity, and wire-feeding velocity is 3.0m/s, line feeding amount 100m; Add molten steel covering agent afterwards, it is 1.0 kg/t steel that add-on controls, and then molten steel is winched to casting station.
E molten steel casting: be 1485 ~ 1495 DEG C at molten steel temperature in tundish, pulling rate is 1.7 ~ 1.9m/min, and crystallizer cooling water flow is 115 ~ 125m
3/ h, two cold specific waters are 0.8 ~ 1.0L/kg, and M-EMS Current intensity is 300A, running frequency is under the condition of 2.5HZ, the molten steel casting of D step is become the steel billet of section 150mm × 150mm, and strand specified length is 11.8m.
F heating steel billet: E step gained steel billet heat is delivered to process furnace, steel billet charging temperature 500 ~ 600 DEG C, and process furnace preheating section furnace temperature 820 ~ 950 DEG C, is slowly warming up to 780 DEG C with the speed of 4 ~ 5 DEG C/min; Be rapidly heated to 880 DEG C with the speed of 10 DEG C/min afterwards, enter subsequently temperature be 1040 ~ 1160 DEG C force hot arc, with 8 DEG C/min by heating steel billet to 1040 DEG C; Steel billet enters the soaking zone soaking of 1180 ~ 1220 DEG C afterwards, and soaking time is 25 ~ 30min, rolling of coming out of the stove behind steel billet soaking to 1100 ~ 1120 DEG C.
G steel billet controlled rolling and controlled cooling: merchant bar mill rolling sent into by steel billet E step prepared, with 0.4 ~ 0.6m/s speed, first and second passage roughing de-scaling precooling is carried out to steel billet, after roughing de-scaling precooling, steel billet enters rear four-pass roughing with 1040 DEG C of temperature, roll speed 0.76 ~ 2.25m/s, roughing is rolling 6 passages altogether, rolling time 20s; Roll in carrying out with the roll speed of 2.74 ~ 5.12m/s again, rolling 8 passages, rolling time 20 ~ 22s; Afterwards by tank precooling, steel is chilled to 1000 ~ 1020 DEG C in advance from 1020 ~ 1050 DEG C, carries out finish rolling with the roll speed of 6.8 ~ 14.2m/s, rolling 2 ~ 4 passages, rolling time 32 ~ 36s, after finish rolling, temperature controls is 890 ~ 940 DEG C.
H steel aftertreatment: the finish rolling steel rolling of G step obtained, at the water yield 360 ~ 480m
3cool fast in the cooling tank of/h, cooling water pressure 1.4 ~ 1.8MPa, quick cooling time 1.5 ~ 2.1s.Given fast to cold bed by roller-way after cooling, the temperature of cold bed on steel is made to be 480 ~ 520 DEG C, reinforcing bar air cooling after upper cold bed, be cooled to 350 ~ 380 DEG C to shear, collect, bundling, bundled reinforcing bar is stacked in steel tank, Simple heat insulation is used to cover in 340 ~ 360 DEG C of insulations after 24 hours, steel is hung out outside stay-warm case, naturally cool to room temperature, namely the corrosion-resistant prestressed structure Twisted Steel of a kind of 1080MPa grade high-strength is obtained, the chemical composition of this reinforcing bar is: C:0.50 ~ 0.60 wt%, Si:1.25 ~ 1.50 wt%, Mn:1.20 ~ 1.40wt%, , Cr:0.40 ~ 0.60wt%, Mo:0.040 ~ 0.070 wt%, Ti:0.040 ~ 0.070 wt%, Ni:0.15 ~ 0.30 wt%, S :≤0.010wt%, P :≤0.015wt%, all the other are Fe and inevitable impurity, its technologic mechanics performance is shown in Table 1.
Table 1 1080MPa grade high-strength corrosion-resistant prestressed structure Twisted Steel technologic mechanics performance
Under the prerequisite that patent of the present invention C content in steel is higher, by adding tiny alloying element Ti, adopt lower final rolling temperature and cooling control after rolling technique, add the motivating force of microalloy carbide TiC Precipitation, low temperature ferrite area matrix, crystal boundary and dislocation line have been separated out the second-phase of a large amount of small and dispersed, precipitation strength and Grain refinement significantly improve, and the intensity of steel significantly improves; By adding appropriate alloying elements cr, Ni, Mo of improving hardening capacity in steel, adopt suitable heating cycle, ensure that the fully solid solution in heating austenitization of alloy strengthening element, adopt the austenitic grain-size before and after Controlled Rolling And Controlled Cooling control phase in version and form, suppress dynamic recrystallization and Static Recrystallization process, fining austenite grains.By fining austenite grains, make steel organize Grain Refinement Effect significantly to strengthen, decrease the ferrite network tissue of steel core.Cr, Ni, Mo add, prestressed structure Twisted Steel of the present invention is made to have good corrosion resistance nature, according to GB/10124 " Uniform Corrosion Method of Laboratory Immersion Test method " detection method, at standard sulfuric acid concentration 20%, corrosion temperature is that under 25 DEG C of conditions, corrosion rate is less than 0.98mm/a.
The 1080MPa grade high-strength corrosion-resistant prestressed structure Twisted Steel that patent of the present invention is produced has that intensity is high, plasticity and toughness are excellent, changes in hardness is slow, and mechanical property, Relaxation of prestressing excellent performance are well corrosion-resistant, the series of advantages such as long service life.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated, but limited the present invention never in any form, and any conversion done based on training centre of the present invention or replacement, all belong to protection scope of the present invention.
The corrosion-resistant prestressed structure Twisted Steel of 1080MPa grade high-strength of the present invention, comprise following weight percents: C:0.50 ~ 0.60 wt%, Si:1.25 ~ 1.50 wt%, Mn:1.20 ~ 1.40wt%, Cr:0.40 ~ 0.60wt%, Mo:0.040 ~ 0.070 wt%, Ti:0.040 ~ 0.070 wt%, Ni:0.15 ~ 0.30 wt%, S :≤0.010wt%, P :≤0.015wt%, all the other are Fe and inevitable impurity.
The preparation method of the corrosion-resistant prestressed structure Twisted Steel of 1080MPa grade high-strength of the present invention, comprise molten iron converter smelting, deoxidation of molten steel alloying, the refining of molten steel LF stove, molten steel VD vacuum refinement, molten steel casting, heating steel billet, steel billet controlled rolling and controlled cooling, steel post-processing step, specifically comprise:
A molten iron converter smelting: by the amount of 1060 kg/t steel, add the low-sulfur ferrophosphorus water of following masses ratio to LD converter: C 4.5 ~ 5.0wt%, Si 0.30 ~ 0.50wt%, Mn 0.25 ~ 0.50wt%, P 0.060 ~ 0.090wt%, S≤0.015wt%, all the other are Fe and inevitable impurity; By the amount of 45kg/t steel, add the smart steel scrap of following masses ratio to LD converter: C 0.17-0.25wt%, Si 0.30-0.55wt%, Mn 1.15-1.50wt%, P 0.020 ~ 0.040wt%, S 0.015 ~ 0.030wt%, all the other are Fe and inevitable impurity; By the amount of 1.30 ~ 2.80 kg/t steel, add the Rhometal of following masses ratio to LD converter: Ni 99.3wt%, all the other are Fe and inevitable impurity; After low-sulfur ferrophosphorus water, smart steel scrap, ferronickel add LD converter, carry out conventional top bottom blowing, add lime, rhombspar, the slag making of magnesite ball, lime adding amount is 45 ~ 55kg/t steel, rhombspar add-on is 10 ~ 20kg/t steel, magnesite ball add-on is 5.0 ~ 7.0kg/t steel, and control endpoint carbon content >=0.12wt%, tapping temperature is 1625 ~ 1645 DEG C; Tapping forward direction ladle bottom adds quickened lime and refining slag carries out wash heat, and lime adding amount is 3.0kg/t steel, and refining slag add-on is 1.0kg/t steel, and tapping process adopts omnidistance bottom argon blowing technology, and it is 30 ~ 50NL/min that argon flow amount controls.
B deoxidation of molten steel alloying: step A molten steel is tapped, when the molten steel amount in ladle is greater than 1/5, in ladle, add following material successively: by the amount of 20.10 ~ 24.20kg/t steel, add the ferrosilicon of following masses ratio: Si 73.5wt%, all the other are Fe and inevitable impurity; By the amount of 15.50 ~ 18.50kg/t steel, add the high carbon ferromanganese alloy of following masses ratio: Mn 75.8wt%, C 7.2wt%, all the other are Fe and inevitable impurity; By the amount of 6.70 ~ 10.30kg/t steel, add the high carbon ferro-chrome of following masses ratio: Cr 57.5 wt%, C 7.6 wt%, all the other are Fe and inevitable impurity; By the amount of 0.50 ~ 0.95kg/t steel, add the ferro-molybdenum of following masses ratio: Mo 72.5wt%, Si 1.5wt%, all the other are Fe and inevitable impurity; By the amount of 2.60 ~ 3.30kg/t steel, add the carburelant of following masses ratio: C 92.35wt%, S 0.085wt%, ash 4.15wt%, fugitive constituent 1.64wt%, moisture content 0.75wt%, all the other are inevitable impurity; Above-mentioned alloy and carburelant is added when ladle molten steel amount reaches 4/5; After tapping, molten steel is hung and delivers to refining station and carry out LF stove refining treatment and VD vacuum refinement process.
C molten steel LF stove refining: complete molten steel of step B being tapped winches to LF stove refining station and connects the BOTTOM ARGON BLOWING band of gas, opens argon gas and adopts little argon amount (10 ~ 20NL/min) Argon 2 minutes, make molten steel face be wriggling shape; Lower electrode adopts gear 6 ~ 8 grades to change slag afterwards, be energized after 3 minutes, lift electrode and observe stove internalization slag situation, thermometric, sampling afterwards, add lime 3.0 ~ 5.0kg/t steel, calcium carbide 0.4 ~ 0.8 kg/t steel, aluminum shot 0.2 ~ 0.6 kg/t steel carry out residue adjustment, control Oxygen Content in Liquid Steel≤0.0005wt%, by the amount of 1.60 ~ 2.90kg/t steel, add the ferrotianium of following masses ratio: Ti 31.5 wt%, all the other are Fe and inevitable impurity; Liquid steel temperature is heated to 1570 ~ 1590 DEG C by lower electrode, then adds quartz sand 180 ~ 250kg, and lower electrode is saturating by quartz sandization, and bits basicity controls by 0.8 ~ 1.2; Meanwhile, according to steel sample assay, add alloy synchronization control molten steel composition; Bitsization are good, after composition adjustment, liquid steel temperature is heated to 1600 ~ 1610 DEG C and carries out the process of soft blow argon, adopt flow to be that the little argon gas amount of 20 ~ 30NL/min was to molten steel soft blow argon 5 minutes.
D molten steel VD stove vacuum refinement: the molten steel after step C soft blow argon is hung in VD stove vacuum tank, connect Argon pipe, close vacuum container cover, carries out forvacuum 7 minutes; When vacuum is evacuated to 67Pa, starts to carry out Fruit storage, carry out BOTTOM ARGON BLOWING process simultaneously, flow control is 70 ~ 90NL/min, and time controling is 15 minutes; Close vacuum main valve, multiple pressure afterwards, promote cover, to liquid steel sampling, determine carbon, determine oxygen, determine hydrogen; Afterwards molten steel is carried out the process of soft blow argon, adopt flow to be that the little argon gas amount of 20 ~ 30NL/min was to molten steel soft blow argon 5 minutes; Carry out denaturing treatment to molten steel feeding silicon-calcium wire afterwards, feeding has the silicon-calcium wire of following masses ratio: Si 56.5wt%, Ca 29.5 wt%, all the other are Fe and inevitable impurity, and wire-feeding velocity is 3.0m/s, line feeding amount 100m; Add molten steel covering agent afterwards, it is 1.0 kg/t steel that add-on controls, and then molten steel is winched to casting station.
E molten steel casting: be 1485 ~ 1495 DEG C at molten steel temperature in tundish, pulling rate is 1.7 ~ 1.9m/min, and crystallizer cooling water flow is 115 ~ 125m
3/ h, two cold specific waters are 0.8 ~ 1.0L/kg, and M-EMS Current intensity is 300A, running frequency is under the condition of 2.5HZ, the molten steel casting of D step is become the steel billet of section 150mm × 150mm, and strand specified length is 11.8m.
F heating steel billet: E step gained steel billet heat is delivered to process furnace, steel billet charging temperature 500 ~ 600 DEG C, and process furnace preheating section furnace temperature 820 ~ 950 DEG C, is slowly warming up to 780 DEG C with the speed of 4 ~ 5 DEG C/min; Be rapidly heated to 880 DEG C with the speed of 10 DEG C/min afterwards, enter subsequently temperature be 1040 ~ 1160 DEG C force hot arc, with 8 DEG C/min heating steel billet to 1040 DEG C; After temperature, steel billet enters the soaking zone soaking of 1180 ~ 1220 DEG C, and soaking time is 25 ~ 30min, rolling of coming out of the stove after steel billet soaking 1100 ~ 1120 DEG C.
G steel billet controlled rolling and controlled cooling: merchant bar mill rolling sent into by steel billet E step prepared, with 0.4 ~ 0.6m/s speed, first and second passage roughing de-scaling precooling is carried out to steel billet, after roughing de-scaling precooling, steel billet enters rear four-pass roughing with 1040 DEG C of temperature, roll speed 0.76 ~ 2.25m/s, roughing is rolling 6 passages altogether, rolling time 20s; Roll in carrying out with the roll speed of 2.74 ~ 5.12m/s again, rolling 6 passages, rolling time 20 ~ 22s; Afterwards by tank precooling, steel is chilled to 1000 ~ 1020 DEG C in advance from 1020 ~ 1050 DEG C, carries out finish rolling with the roll speed of 6.8 ~ 14.2m/s, rolling 2 ~ 4 passages, rolling time 32 ~ 36s, after finish rolling, temperature controls is 890 ~ 940 DEG C.
H steel aftertreatment: the finish rolling steel rolling of G step obtained, at the water yield 360 ~ 480m
3/ h, cool fast in the cooling tank of cooling water pressure 1.4 ~ 1.8MPa, cooling time 1.5 ~ 2.1s, given fast to cold bed by roller-way after cooling, the temperature using roller-way is 480 ~ 520 DEG C, be cooled to 350 ~ 380 DEG C after upper cold bed to shear, collect, bundling, bundled reinforcing bar is stacked in steel tank, Simple heat insulation is used to cover in 340 ~ 360 DEG C of insulations after 24 hours, steel is hung out outside stay-warm case, naturally cool to room temperature, namely the corrosion-resistant prestressed structure Twisted Steel of a kind of 1080MPa grade high-strength is obtained, the chemical composition of this reinforcing bar is: C:0.50 ~ 0.60 wt%, Si:1.25 ~ 1.50 wt%, Mn:1.20 ~ 1.40wt%, Cr:0.40 ~ 0.60wt%, Mo:0.040 ~ 0.070 wt%, Ti:0.040 ~ 0.070 wt%, Ni:0.15 ~ 0.30 wt%, S :≤0.010wt%, P :≤0.015wt%, all the other are Fe and inevitable impurity, its technologic mechanics performance is shown in Table 1,
Table 1 1080MPa grade high-strength corrosion-resistant prestressed structure Twisted Steel technologic mechanics performance
embodiment 1
A molten iron converter smelting: by the amount of 1060 kg/t steel, adds the low-sulfur ferrophosphorus water of following masses ratio: C 4.5wt%, Si 0.30wt%, Mn 0.25wt%, P 0.060wt%, S 0.010wt% to LD converter, all the other are Fe and inevitable impurity; By the amount of 45kg/t steel, add the smart steel scrap of following masses ratio to LD converter: C 0.17wt%, Si 0.30wt%, Mn 1.15wt%, P 0.020wt%, S 0.015wt%, all the other are Fe and inevitable impurity; By the amount of 1.30kg/t steel, add the Rhometal of following masses ratio to LD converter: Ni 99.3wt%, all the other are Fe and inevitable impurity; After low-sulfur ferrophosphorus water, smart steel scrap, ferronickel add LD converter, carry out conventional top bottom blowing, add conventional lime, rhombspar, the slag making of magnesite ball, lime adding amount is 45kg/t steel, rhombspar add-on is 10kg/t steel, magnesite ball add-on is 5.0kg/t steel, and control endpoint carbon content 0.12wt%, tapping temperature is 1625 DEG C; Tapping forward direction ladle bottom adds quickened lime and refining slag carries out wash heat, and lime adding amount is 3.0kg/t steel, and refining slag add-on is 1.0kg/t steel, and tapping process adopts omnidistance bottom argon blowing technology, and argon flow amount controls as 30NL/min.
B deoxidation of molten steel alloying: step A molten steel is tapped, when the molten steel amount in ladle is greater than 1/5, in ladle, add following material successively: by the amount of 20.10kg/t steel, add the ferrosilicon of following masses ratio: Si 73.5wt%, all the other are Fe and inevitable impurity; By the amount of 15.50kg/t steel, add the high carbon ferromanganese alloy of following masses ratio: Mn 75.8wt%, C 7.2wt%, all the other are Fe and inevitable impurity; By the amount of 6.70kg/t steel, add the high carbon ferro-chrome of following masses ratio: Cr 57.5 wt%, C 7.6 wt%, all the other are Fe and inevitable impurity; By the amount of 0.50kg/t steel, add the ferro-molybdenum of following masses ratio: Mo 72.5wt%, Si 1.5wt%, all the other are Fe and inevitable impurity; By 2.60kg/t
steelamount, add the carburelant of following masses ratio: C 92.35wt%, S 0.085wt%, ash 4.15wt%, fugitive constituent 1.64wt%, moisture content 0.75wt%, all the other are inevitable impurity; Above-mentioned alloy and carburelant is added when ladle molten steel amount reaches 4/5; After tapping, molten steel is hung and delivers to refining station and carry out LF stove refining treatment and VD vacuum refinement process.
C molten steel LF stove refining: complete molten steel of step B being tapped winches to LF stove refining station and connects the BOTTOM ARGON BLOWING band of gas, opens argon gas and adopts little argon amount (10NL/min) Argon 2 minutes, make molten steel face be wriggling shape; Lower electrode adopts gear 6 ~ 8 grades to change slag afterwards, be energized after 3 minutes, lift electrode and observe stove internalization slag situation, thermometric, sampling afterwards, add lime 3.0kg/t steel, calcium carbide 0.4kg/t steel, aluminum shot 0.2kg/t steel carry out residue adjustment, control Oxygen Content in Liquid Steel 0.0005wt%, by the amount of 1.60kg/t steel, add the ferrotianium of following masses ratio: Ti 31.5 wt%, all the other are Fe and inevitable impurity; Liquid steel temperature is heated to 1590 DEG C by lower electrode, then adds quartz sand 180kg, and lower electrode is saturating by quartz sandization, and bits basicity controls by 0.8; Meanwhile, according to steel sample assay, add alloy synchronization control molten steel composition; Bitsization are good, after composition adjustment, liquid steel temperature is heated to 1610 DEG C and carries out the process of soft blow argon, adopt flow to be that the little argon gas amount of 20NL/min was to molten steel soft blow argon 5 minutes.
D molten steel VD stove vacuum refinement: the molten steel after step C soft blow argon is hung in VD stove vacuum tank, connect Argon pipe, close vacuum container cover, carries out forvacuum 7 minutes; When vacuum is evacuated to 67Pa, starts to carry out Fruit storage, carry out BOTTOM ARGON BLOWING process simultaneously, flow control is 70NL/min, and time controling is 15 minutes; Close vacuum main valve, multiple pressure afterwards, promote cover, to liquid steel sampling, determine carbon, determine oxygen, determine hydrogen; Afterwards molten steel is carried out the process of soft blow argon, adopt flow to be that the little argon gas amount of 20NL/min was to molten steel soft blow argon 5 minutes; Carry out denaturing treatment to molten steel feeding silicon-calcium wire afterwards, feeding has the silicon-calcium wire of following masses ratio: Si 56.5wt%, Ca 29.5 wt%, all the other are Fe and inevitable impurity, and wire-feeding velocity is 3.0m/s, line feeding amount 100m; Add molten steel covering agent afterwards, it is 1.0 kg/t steel that add-on controls, and then molten steel is winched to casting station.
E molten steel casting: be 1495 DEG C at molten steel temperature in tundish, pulling rate is 1.9m/min, and crystallizer cooling water flow is 125m
3/ h, two cold specific waters are 1.0L/kg, and M-EMS Current intensity is 300A, running frequency is under the condition of 2.5HZ, the molten steel casting of D step is become the steel billet of section 150mm × 150mm, and strand specified length is 11.8m.
F heating steel billet: E step gained steel billet heat is delivered to process furnace, steel billet charging temperature 500 DEG C, and process furnace preheating section furnace temperature 820 ~ 950 DEG C, is slowly warming up to 780 DEG C with the speed of 5 DEG C/min; Be rapidly heated to 880 DEG C with the speed of 10 DEG C/min afterwards, enter subsequently temperature be 1040 ~ 1160 DEG C force hot arc, with 8 DEG C/min by heating steel billet to 1040 DEG C; Steel billet enters the soaking zone soaking of 1180 ~ 1220 DEG C afterwards, and soaking time is 25min, rolling of coming out of the stove after steel billet soaking to 1100 DEG C.
G steel billet controlled rolling and controlled cooling: merchant bar mill rolling sent into by steel billet E step prepared, with 0.4 ~ 0.6m/s speed, first and second passage roughing de-scaling precooling is carried out to steel billet, after roughing de-scaling precooling, steel billet enters rear four-pass roughing with 1040 DEG C of temperature, roll speed 0.76 ~ 2.25m/s, roughing is rolling 6 passages altogether, rolling time 20s; Roll in carrying out with the roll speed of 2.74 ~ 5.011m/s again, rolling 6 passages, rolling time 22s; Afterwards by tank precooling, steel is chilled to 1000 DEG C in advance from 1020 DEG C, carries out finish rolling with the roll speed of 6.8 ~ 14.2m/s, rolling 4 passages, rolling time 36s, completely roll temperature 890 DEG C.
H steel aftertreatment: the finish rolling steel rolling of G step obtained, at water yield 360m
3cool fast in the cooling tank of/h, cooling water pressure 1.4MPa, quick cooling time 1.5s.Given fast to cold bed by roller-way after cooling, the temperature of cold bed on steel is made to be 480 DEG C, reinforcing bar natural air cooling after upper cold bed, be cooled to 350 DEG C carry out shearing, collect, bundling, bundled reinforcing bar is stacked in steel tank, uses Simple heat insulation to cover in 340 DEG C of insulations after 24 hours, steel is hung out outside stay-warm case, naturally cool to room temperature, namely obtain the corrosion-resistant prestressed structure Twisted Steel of a kind of 1080MPa grade high-strength, the chemical composition of this reinforcing bar is:
C:0.50wt%, Si:1.25 wt%, Mn:1.20wt%, Cr:0.40wt%, Mo:0.040 wt%, Ti:0.040 wt%, Ni:0.15wt%, S:0.006wt%, P:0.009wt%, all the other are Fe and inevitable impurity.
The 1080MPa grade high-strength corrosion-resistant prestressed structure Twisted Steel technologic mechanics performance that embodiment 1 provides is shown in Table 2.
Table 2 1080MPa grade high-strength corrosion-resistant prestressed structure Twisted Steel technologic mechanics performance
embodiment 2
A molten iron converter smelting: by the amount of 1060 kg/t steel, adds the low-sulfur ferrophosphorus water of following masses ratio: C 4.8wt%, Si 0.40wt%, Mn 0.38wt%, P 0.075wt%, S 0.012wt% to LD converter, all the other are Fe and inevitable impurity; By the amount of 45kg/t steel, add the smart steel scrap of following masses ratio to LD converter: C 0.21wt%, Si 0.42wt%, Mn 1.30wt%, P 0.030wt%, S 0.028wt%, all the other are Fe and inevitable impurity; By the amount of 2.10 kg/t steel, add the Rhometal of following masses ratio to LD converter: Ni 99.3wt%, all the other are Fe and inevitable impurity; After low-sulfur ferrophosphorus water, smart steel scrap, ferronickel add LD converter, carry out conventional top bottom blowing, add conventional lime, rhombspar, the slag making of magnesite ball, lime adding amount is 50kg/t steel, rhombspar add-on is 15kg/t steel, magnesite ball add-on is 6.0kg/t steel, and control endpoint carbon content 0.13wt%, tapping temperature is 1635 DEG C; Tapping forward direction ladle bottom adds quickened lime and refining slag carries out wash heat, and lime adding amount is 3.0kg/t steel, and refining slag add-on is 1.0kg/t steel, and tapping process adopts omnidistance bottom argon blowing technology, and argon flow amount controls as 45NL/min.
B deoxidation of molten steel alloying: step A molten steel is tapped, when the molten steel amount in ladle is greater than 1/5, in ladle, add following material successively: by the amount of 22.60kg/t steel, add the ferrosilicon of following masses ratio: Si 73.5wt%, all the other are Fe and inevitable impurity; By the amount of 17.00kg/t steel, add the high carbon ferromanganese alloy of following masses ratio: Mn 75.8wt%, C 7.2wt%, all the other are Fe and inevitable impurity; By the amount of 8.50kg/t steel, add the high carbon ferro-chrome of following masses ratio: Cr 57.5 wt%, C 7.6 wt%, all the other are Fe and inevitable impurity; By the amount of 0.75kg/t steel, add the ferro-molybdenum of following masses ratio: Mo 72.5wt%, Si 1.5wt%, all the other are Fe and inevitable impurity; By 3.00kg/t
steelamount, add the carburelant of following masses ratio: C 92.35wt%, S 0.085wt%, ash 4.15wt%, fugitive constituent 1.64wt%, moisture content 0.75wt%, all the other are inevitable impurity; Above-mentioned alloy and carburelant is added when ladle molten steel amount reaches 4/5; After tapping, molten steel is hung and delivers to refining station and carry out LF stove refining treatment and VD vacuum refinement process.
C molten steel LF stove refining: complete molten steel of step B being tapped winches to LF stove refining station and connects the BOTTOM ARGON BLOWING band of gas, opens argon gas and adopts little argon amount (10 ~ 20NL/min) Argon 2 minutes, make molten steel face be wriggling shape; Lower electrode adopts gear 6 ~ 8 grades to change slag afterwards, be energized after 3 minutes, lift electrode and observe stove internalization slag situation, thermometric, sampling afterwards, add lime 4.0kg/t steel, calcium carbide 0.6 kg/t steel, aluminum shot 0.4 kg/t steel carry out residue adjustment, control Oxygen Content in Liquid Steel 0.0003wt%, by the amount of 2.20kg/t steel, add the ferrotianium of following masses ratio: Ti 31.5 wt%, all the other are Fe and inevitable impurity; Liquid steel temperature is heated to 1580 DEG C by lower electrode, then adds quartz sand 210kg, and lower electrode is saturating by quartz sandization, and bits basicity controls by 1.0; Meanwhile, according to steel sample assay, add alloy synchronization control molten steel composition; Bitsization are good, after composition adjustment, liquid steel temperature is heated to 1605 DEG C and carries out the process of soft blow argon, adopt flow to be that the little argon gas amount of 25NL/min was to molten steel soft blow argon 5 minutes.
D molten steel VD stove vacuum refinement: the molten steel after step C soft blow argon is hung in VD stove vacuum tank, connect Argon pipe, close vacuum container cover, carries out forvacuum 7 minutes; When vacuum is evacuated to 67Pa, starts to carry out Fruit storage, carry out BOTTOM ARGON BLOWING process simultaneously, flow control is 80NL/min, and time controling is 15 minutes; Close vacuum main valve, multiple pressure afterwards, promote cover, to liquid steel sampling, determine carbon, determine oxygen, determine hydrogen; Afterwards molten steel is carried out the process of soft blow argon, adopt flow to be that the little argon gas amount of 25NL/min was to molten steel soft blow argon 5 minutes; Carry out denaturing treatment to molten steel feeding silicon-calcium wire afterwards, feeding has the silicon-calcium wire of following masses ratio: Si 56.5wt%, Ca 29.5 wt%, all the other are Fe and inevitable impurity, and wire-feeding velocity is 3.0m/s, line feeding amount 100m; Add molten steel covering agent afterwards, it is 1.0 kg/t steel that add-on controls, and then molten steel is winched to casting station.
E molten steel casting: be 1490 DEG C at molten steel temperature in tundish, pulling rate is 1.8m/min, and crystallizer cooling water flow is 120m
3/ h, two cold specific waters are 0.9L/kg, and M-EMS Current intensity is 300A, running frequency is under the condition of 2.5HZ, the molten steel casting of D step is become the steel billet of section 150mm × 150mm, and strand specified length is 11.8m.
F heating steel billet: E step gained steel billet heat is delivered to process furnace, steel billet charging temperature 550 DEG C, and process furnace preheating section furnace temperature 820 ~ 950 DEG C, is slowly warming up to 780 DEG C with the speed of 4.5 DEG C/min; Be rapidly heated to 880 DEG C with the speed of 10 DEG C/min afterwards, enter subsequently temperature be 1040 ~ 1160 DEG C force hot arc, with 8 DEG C/min by heating steel billet to 1040 DEG C; Steel billet enters the soaking zone soaking of 1200 DEG C afterwards, and soaking time is 28min, rolling of coming out of the stove after steel billet soaking to 1110 DEG C.
G steel billet controlled rolling and controlled cooling: merchant bar mill rolling sent into by steel billet E step prepared, with 0.4 ~ 0.6m/s speed, first and second passage roughing de-scaling precooling is carried out to steel billet, after roughing de-scaling precooling, steel billet enters rear four-pass roughing with 1040 DEG C of temperature, roll speed 0.76 ~ 2.25m/s, roughing is rolling 6 passages altogether, rolling time 20s; Roll in carrying out with the roll speed of 2.75 ~ 4.94m/s again, rolling 6 passages, rolling time 21s; Afterwards by tank precooling, steel is chilled to 1000 DEG C in advance from 1030 DEG C, carries out finish rolling with the roll speed of 7.2 ~ 13.5m/s, rolling 4 passages, rolling time 34s, after finish rolling, temperature controls is 910 DEG C.
H steel aftertreatment: the finish rolling steel rolling of G step obtained, at water yield 410m
3cool fast in the cooling tank of/h, cooling water pressure 1.6MPa, quick cooling time 1.8s.Cold bed is delivered to fast by roller-way after cooling, the temperature of cold bed on steel is made to be 500 DEG C, reinforcing bar air cooling after upper cold bed, be cooled to 370 DEG C carry out shearing, collect, bundling, bundled reinforcing bar is stacked in steel tank, uses Simple heat insulation to cover in 350 DEG C of insulations after 24 hours, steel is hung out stay-warm case, naturally cool to room temperature, namely obtain the corrosion-resistant prestressed structure Twisted Steel of a kind of 1080MPa grade high-strength.The chemical composition of this reinforcing bar is:
C:0.55wt%, Si:1.42wt%, Mn:1.30wt%, Cr:0.50wt%, Mo:0.065 wt%, Ti:0.065wt%, Ni:0.22wt%, S:0.009wt%, P:0.012wt%, all the other are Fe and inevitable impurity.
The 1080MPa grade high-strength corrosion-resistant prestressed structure Twisted Steel technologic mechanics performance that embodiment 2 provides is shown in Table 3.
Table 3 1080MPa grade high-strength corrosion-resistant prestressed structure Twisted Steel technologic mechanics performance
embodiment 3
A molten iron converter smelting: by the amount of 1060 kg/t steel, adds the low-sulfur ferrophosphorus water of following masses ratio: C 5.0wt%, Si 0.50wt%, Mn 0.50wt%, P 0.090wt%, S 0.015wt% to LD converter, all the other are Fe and inevitable impurity; By the amount of 45kg/t steel, add the smart steel scrap of following masses ratio to LD converter: C 0.25wt%, Si 0.55wt%, Mn 1.50wt%, P 0.040wt%, S 0.030wt%, all the other are Fe and inevitable impurity; By the amount of 2.80 kg/t steel, add the Rhometal of following masses ratio to LD converter: Ni 99.3wt%, all the other are Fe and inevitable impurity; After low-sulfur ferrophosphorus water, smart steel scrap, ferronickel add LD converter, carry out conventional top bottom blowing, add conventional lime, rhombspar, the slag making of magnesite ball, lime adding amount is 55kg/t steel, rhombspar add-on is 20kg/t steel, magnesite ball add-on is 7.0kg/t steel, and control endpoint carbon content 0.15wt%, tapping temperature is 1625 DEG C; Tapping forward direction ladle bottom adds quickened lime and refining slag carries out wash heat, and lime adding amount is 3.0kg/t steel, and refining slag add-on is 1.0kg/t steel, and tapping process adopts omnidistance bottom argon blowing technology, and argon flow amount controls as 50NL/min.
B deoxidation of molten steel alloying: step A molten steel is tapped, when the molten steel amount in ladle is greater than 1/5, in ladle, add following material successively: by the amount of 24.20kg/t steel, add the ferrosilicon of following masses ratio: Si 73.5wt%, all the other are Fe and inevitable impurity; By the amount of 18.50kg/t steel, add the high carbon ferromanganese alloy of following masses ratio: Mn 75.8wt%, C 7.2wt%, all the other are Fe and inevitable impurity; By the amount of 10.30kg/t steel, add the high carbon ferro-chrome of following masses ratio: Cr 57.5 wt%, C 7.6 wt%, all the other are Fe and inevitable impurity; By the amount of 0.95kg/t steel, add the ferro-molybdenum of following masses ratio: Mo 72.5wt%, Si 1.5wt%, all the other are Fe and inevitable impurity; By 3.30kg/t
steelamount, add the carburelant of following masses ratio: C 92.35wt%, S 0.085wt%, ash 4.15wt%, fugitive constituent 1.64wt%, moisture content 0.75wt%, all the other are inevitable impurity; Above-mentioned alloy and carburelant is added when ladle molten steel amount reaches 4/5; After tapping, molten steel is hung and delivers to refining station and carry out LF stove refining treatment and VD vacuum refinement process.
C molten steel LF stove refining: complete molten steel of step B being tapped winches to LF stove refining station and connects the BOTTOM ARGON BLOWING band of gas, opens argon gas and adopts little argon amount (20NL/min) Argon 2 minutes, make molten steel face be wriggling shape; Lower electrode adopts gear 6 ~ 8 grades to change slag afterwards, be energized after 3 minutes, lift electrode and observe stove internalization slag situation, thermometric, sampling afterwards, add lime 5.0kg/t steel, calcium carbide 0.8 kg/t steel, aluminum shot 0.6 kg/t steel carry out residue adjustment, control Oxygen Content in Liquid Steel is 0.0002wt%, by the amount of 2.90kg/t steel, add the ferrotianium of following masses ratio: Ti 31.5 wt%, all the other are Fe and inevitable impurity; Liquid steel temperature is heated to 1570 DEG C by lower electrode, then adds quartz sand 250kg, and lower electrode is saturating by quartz sandization, and bits basicity controls by 1.2; Meanwhile, according to steel sample assay, add alloy synchronization control molten steel composition; Bitsization are good, after composition adjustment, liquid steel temperature is heated to 1600 DEG C and carries out the process of soft blow argon, adopt flow to be that the little argon gas amount of 30NL/min was to molten steel soft blow argon 5 minutes.
D molten steel VD stove vacuum refinement: the molten steel after step C soft blow argon is hung in VD stove vacuum tank, connect Argon pipe, close vacuum container cover, carries out forvacuum 7 minutes; When vacuum is evacuated to 67Pa, starts to carry out Fruit storage, carry out BOTTOM ARGON BLOWING process simultaneously, flow control is 90NL/min, and time controling is 15 minutes; Close vacuum main valve, multiple pressure afterwards, promote cover, to liquid steel sampling, determine carbon, determine oxygen, determine hydrogen; Afterwards molten steel is carried out the process of soft blow argon, adopt flow to be that the little argon gas amount of 30NL/min was to molten steel soft blow argon 5 minutes; Carry out denaturing treatment to molten steel feeding silicon-calcium wire afterwards, feeding has the silicon-calcium wire of following masses ratio: Si 56.5wt%, Ca 29.5 wt%, all the other are Fe and inevitable impurity, and wire-feeding velocity is 3.0m/s, line feeding amount 100m; Add molten steel covering agent afterwards, it is 1.0 kg/t steel that add-on controls, and then molten steel is winched to casting station.
E molten steel casting: be 1485 DEG C at molten steel temperature in tundish, pulling rate is 1.7m/min, and crystallizer cooling water flow is 115m
3/ h, two cold specific waters are 0.8L/kg, and M-EMS Current intensity is 300A, running frequency is under the condition of 2.5HZ, the molten steel casting of D step is become the steel billet of section 150mm × 150mm, and strand specified length is 11.8m.
F heating steel billet: E step gained steel billet heat is delivered to process furnace, steel billet charging temperature 600 DEG C, and process furnace preheating section furnace temperature 820 ~ 950 DEG C, is slowly warming up to 780 DEG C with the speed of 4 DEG C/min; Be rapidly heated to 880 DEG C with the speed of 10 DEG C/min afterwards, enter subsequently temperature be 1160 DEG C force hot arc, with 8 DEG C/min heating steel billet to 1040 DEG C; After temperature, steel billet enters the soaking zone soaking of 1220 DEG C, and soaking time is 30min, rolling of coming out of the stove after steel billet soaking to 1120 DEG C.
G steel billet controlled rolling and controlled cooling: merchant bar mill rolling sent into by steel billet E step prepared, with 0.4 ~ 0.6m/s speed, first and second passage roughing de-scaling precooling is carried out to steel billet, after roughing de-scaling precooling, steel billet enters rear four-pass roughing with 1040 DEG C of temperature, roll speed 0.76 ~ 2.25m/s, roughing is rolling 6 passages altogether, rolling time 20s; Roll in carrying out with the roll speed of 2.74 ~ 5.06m/s again, rolling 6 passages, rolling time 22s; Afterwards by tank precooling, steel is chilled to 1010 DEG C in advance from 1050 DEG C, carries out finish rolling with the roll speed of 6.8 ~ 10.9m/s, rolling 2 passages, rolling time 32s, after finish rolling, temperature controls is 940 DEG C.
H steel aftertreatment: the finish rolling steel rolling of G step obtained, at water yield 480m
3cool fast in the cooling tank of/h, cooling water pressure 1.8MPa, quick cooling time 2.1s.Cold bed is delivered to fast by roller-way after cooling, the temperature of cold bed on steel is made to be 520 DEG C, reinforcing bar natural air cooling after upper cold bed, be cooled to that 380 DEG C are carried out shearing, collect, bundling, bundled reinforcing bar stack in steel tank, Simple heat insulation is used to cover in 360 DEG C of insulations after 24 hours, steel is hung out outside stay-warm case, naturally cool to room temperature, namely obtain the corrosion-resistant prestressed structure Twisted Steel of a kind of 1080MPa grade high-strength.The chemical composition of this reinforcing bar is:
C:0.60 wt%, Si:1.50 wt%, Mn:1.40wt%, Cr:0.60wt%, Mo:0.070 wt%, Ti:0.070 wt%, Ni:0.30 wt%, S:0.010wt%, P:0.015wt%, all the other are Fe and inevitable impurity.
The 1080MPa grade high-strength corrosion-resistant prestressed structure Twisted Steel technologic mechanics performance that embodiment 3 provides is shown in Table 4.
Table 4 1080MPa grade high-strength corrosion-resistant prestressed structure Twisted Steel technologic mechanics performance
Claims (2)
1. the corrosion-resistant prestressed structure Twisted Steel of 1080MPa grade high-strength, it is characterized in that comprising following weight percents: C:0.50 ~ 0.60 wt%, Si:1.25 ~ 1.50 wt%, Mn:1.20 ~ 1.40wt%, Cr:0.40 ~ 0.60wt%, Mo:0.040 ~ 0.070 wt%, Ti:0.040 ~ 0.070 wt%, Ni:0.15 ~ 0.30 wt%, S :≤0.010wt%, P :≤0.015wt%, all the other are Fe and inevitable impurity.
2. the preparation method of the corrosion-resistant prestressed structure Twisted Steel of 1080MPa grade high-strength according to claim 1, it is characterized in that comprising molten iron converter smelting, deoxidation of molten steel alloying, the refining of molten steel LF stove, molten steel VD vacuum refinement, molten steel casting, heating steel billet, steel billet controlled rolling and controlled cooling, steel post-processing step, specifically comprise:
A molten iron converter smelting: by the amount of 1060 kg/t steel, add the low-sulfur ferrophosphorus water of following masses ratio to LD converter: C 4.5 ~ 5.0wt%, Si 0.30 ~ 0.50wt%, Mn 0.25 ~ 0.50wt%, P 0.060 ~ 0.090wt%, S≤0.015wt%, all the other are Fe and inevitable impurity; By the amount of 45kg/t steel, add the smart steel scrap of following masses ratio to LD converter: C 0.17-0.25wt%, Si 0.30-0.55wt%, Mn 1.15-1.50wt%, P 0.020 ~ 0.040wt%, S 0.015 ~ 0.030wt%, all the other are Fe and inevitable impurity; By the amount of 1.30 ~ 2.80 kg/t steel, add the Rhometal of following masses ratio to LD converter: Ni 99.3wt%, all the other are Fe and inevitable impurity; After low-sulfur ferrophosphorus water, smart steel scrap, ferronickel add LD converter, carry out conventional top bottom blowing, add lime, rhombspar, the slag making of magnesite ball, lime adding amount is 45 ~ 55kg/t steel, rhombspar add-on is 10 ~ 20kg/t steel, magnesite ball add-on is 5.0 ~ 7.0kg/t steel, and control endpoint carbon content >=0.12wt%, tapping temperature is 1625 ~ 1645 DEG C; Tapping forward direction ladle bottom adds quickened lime and refining slag carries out wash heat, and lime adding amount is 3.0kg/t steel, and refining slag add-on is 1.0kg/t steel, and tapping process adopts omnidistance bottom argon blowing technology, and it is 30 ~ 50NL/min that argon flow amount controls;
B deoxidation of molten steel alloying: step A molten steel is tapped, when the molten steel amount in ladle is greater than 1/5, in ladle, add following material successively: by the amount of 20.10 ~ 24.20kg/t steel, add the ferrosilicon of following masses ratio: Si 73.5wt%, all the other are Fe and inevitable impurity; By the amount of 15.50 ~ 18.50kg/t steel, add the high carbon ferromanganese alloy of following masses ratio: Mn 75.8wt%, C 7.2wt%, all the other are Fe and inevitable impurity; By the amount of 6.70 ~ 10.30kg/t steel, add the high carbon ferro-chrome of following masses ratio: Cr 57.5 wt%, C 7.6 wt%, all the other are Fe and inevitable impurity; By the amount of 0.50 ~ 0.95kg/t steel, add the ferro-molybdenum of following masses ratio: Mo 72.5wt%, Si 1.5wt%, all the other are Fe and inevitable impurity; By the amount of 2.60 ~ 3.30kg/t steel, add the carburelant of following masses ratio: C 92.35wt%, S 0.085wt%, ash 4.15wt%, fugitive constituent 1.64wt%, moisture content 0.75wt%, all the other are inevitable impurity; Above-mentioned alloy and carburelant is added when ladle molten steel amount reaches 4/5; After tapping, molten steel is hung and delivers to refining station and carry out LF stove refining treatment;
C molten steel LF stove refining: complete molten steel of step B being tapped winches to LF stove refining station and connects the BOTTOM ARGON BLOWING band of gas, opens argon gas and adopts little argon amount (10 ~ 20NL/min) Argon 2 minutes, make molten steel face be wriggling shape; Lower electrode adopts gear 6 ~ 8 grades to change slag afterwards, be energized after 3 minutes, lift electrode and observe stove internalization slag situation, thermometric, sampling afterwards, add lime 3.0 ~ 5.0kg/t steel, calcium carbide 0.4 ~ 0.8 kg/t steel, aluminum shot 0.2 ~ 0.6 kg/t steel carry out residue adjustment, control Oxygen Content in Liquid Steel≤0.0005wt%, by the amount of 1.60 ~ 2.90kg/t steel, add the ferrotianium of following masses ratio: Ti 31.5wt%, all the other are Fe and inevitable impurity; Liquid steel temperature is heated to 1570 ~ 1590 DEG C by lower electrode, then adds quartz sand 180 ~ 250kg, and lower electrode is saturating by quartz sandization, and bits basicity controls by 0.8 ~ 1.2; Meanwhile, according to steel sample assay, add alloy synchronization control molten steel composition; Bitsization are good, after composition adjustment, liquid steel temperature is heated to 1600 ~ 1610 DEG C and carries out the process of soft blow argon, adopt flow to be that the little argon gas amount of 20 ~ 30NL/min was to molten steel soft blow argon 5 minutes;
D molten steel VD stove vacuum refinement: the molten steel after step C soft blow argon is hung in VD stove vacuum tank, connect Argon pipe, close vacuum container cover, carries out forvacuum 7 minutes; When vacuum is evacuated to 67Pa, starts to carry out Fruit storage, carry out BOTTOM ARGON BLOWING process simultaneously, flow control is 70 ~ 90NL/min, and time controling is 15 minutes; Close vacuum main valve, multiple pressure afterwards, promote cover, to liquid steel sampling, determine carbon, determine oxygen, determine hydrogen; Afterwards molten steel is carried out the process of soft blow argon, adopt flow to be that the little argon gas amount of 20 ~ 30NL/min was to molten steel soft blow argon 5 minutes; Carry out denaturing treatment to molten steel feeding silicon-calcium wire afterwards, feeding has the silicon-calcium wire of following masses ratio: Si 56.5wt%, Ca 29.5 wt%, all the other are Fe and inevitable impurity, and wire-feeding velocity is 3.0m/s, line feeding amount 100m; Add molten steel covering agent afterwards, it is 1.0 kg/t steel that add-on controls, and then molten steel is winched to casting station;
E molten steel casting: be 1485 ~ 1495 DEG C at molten steel temperature in tundish, pulling rate is 1.7 ~ 1.9m/min, and crystallizer cooling water flow is 115 ~ 125m
3/ h, two cold specific waters are 0.8 ~ 1.0L/kg, and M-EMS Current intensity is 300A, running frequency is under the condition of 2.5HZ, the molten steel casting of D step is become the steel billet of section 150mm × 150mm, and strand specified length is 11.8m;
F heating steel billet: E step gained steel billet heat is delivered to process furnace, steel billet charging temperature 500 ~ 600 DEG C, and process furnace preheating section furnace temperature 820 ~ 950 DEG C, is slowly warming up to 780 DEG C with the speed of 4 ~ 5 DEG C/min; Be rapidly heated to 880 DEG C with the speed of 10 DEG C/min afterwards, enter subsequently temperature be 1040 ~ 1160 DEG C force hot arc, with 8 DEG C/min heating steel billet to 1040 DEG C; After temperature, steel billet enters the soaking zone soaking of 1180 ~ 1220 DEG C, and soaking time is 25 ~ 30min, rolling of coming out of the stove behind steel billet soaking to 1100 ~ 1120 DEG C;
G steel billet controlled rolling and controlled cooling: merchant bar mill rolling sent into by steel billet E step prepared, with 0.4 ~ 0.6m/s speed, first and second passage roughing de-scaling precooling is carried out to steel billet, after roughing de-scaling precooling, steel billet enters rear four-pass roughing with 1040 DEG C of temperature, roll speed 0.76 ~ 2.25m/s, roughing is rolling 6 passages altogether, rolling time 20s; Roll in carrying out with the roll speed of 2.74 ~ 5.12m/s again, rolling 6 passages, rolling time 20 ~ 22s; Afterwards by tank precooling, steel is chilled to 1000 ~ 1020 DEG C in advance from 1020 ~ 1050 DEG C, carries out finish rolling with the roll speed of 6.8 ~ 14.2m/s, rolling 2 ~ 4 passages, rolling time 32 ~ 36s, after finish rolling, temperature controls is 890 ~ 940 DEG C;
H steel aftertreatment: the finish rolling steel rolling of G step obtained, at the water yield 360 ~ 480m
3cool fast in the cooling tank of/h, cooling water pressure 1.4 ~ 1.8MPa, cooling time 1.5 ~ 2.1s, given fast to cold bed by roller-way after cooling, the temperature using roller-way is 480 ~ 520 DEG C, be cooled to after upper cold bed 350 ~ 380 DEG C carry out shearing, collect, bundling, bundled reinforcing bar is stacked in steel tank, Simple heat insulation is used to cover in 340 ~ 360 DEG C of insulations after 24 hours, steel is hung out outside stay-warm case, naturally cool to room temperature, namely obtain the corrosion-resistant prestressed structure Twisted Steel of a kind of 1080MPa grade high-strength, the chemical composition of this reinforcing bar is:
C:0.50 ~ 0.60 wt%, Si:1.25 ~ 1.50 wt%, Mn:1.20 ~ 1.40wt%, Cr:0.40 ~ 0.60wt%, Mo:0.040 ~ 0.070 wt%, Ti:0.040 ~ 0.070 wt%, Ni:0.15 ~ 0.30 wt%, S :≤0.010wt%, P :≤0.015wt%, all the other are Fe and inevitable impurity, and its technologic mechanics performance is shown in Table 1
Table 1 1080MPa grade high-strength corrosion-resistant prestressed structure Twisted Steel technologic mechanics performance
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| CN110257683A (en) * | 2019-07-11 | 2019-09-20 | 中国建筑第五工程局有限公司 | A kind of distortion-free joist spacer ferrule |
| CN110791714A (en) * | 2019-11-20 | 2020-02-14 | 盐城市联鑫钢铁有限公司 | 500MPa twisted steel with good welding performance and production method thereof |
| CN115125443A (en) * | 2022-06-17 | 2022-09-30 | 武汉钢铁有限公司 | High-toughness easy-welding steel and preparation method thereof |
| CN115491602A (en) * | 2022-09-19 | 2022-12-20 | 江苏省产品质量监督检验研究院 | Anti-corrosion fine-grain granulated hot-rolled steel bar and production method thereof |
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