CN101275197A - High-strength rebar and manufacturing process thereof - Google Patents
High-strength rebar and manufacturing process thereof Download PDFInfo
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- CN101275197A CN101275197A CNA2007101192954A CN200710119295A CN101275197A CN 101275197 A CN101275197 A CN 101275197A CN A2007101192954 A CNA2007101192954 A CN A2007101192954A CN 200710119295 A CN200710119295 A CN 200710119295A CN 101275197 A CN101275197 A CN 101275197A
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Abstract
A high intensity deformed steel bar and a manufacturing procedure thereof are disclosed, belonging to the field of steel metallurgy and suitable for the deformed steel bar with 12mm to 40mm production standard. The high intensity deformed steel bar of the invention comprises the ingredients: C: 0.12-0.25%; Si; 0.12-0.80%; Mn: 0.30-1.55%, P: 0.01-0.035%, S: 0.01-0.040%, equivalent weight of carbon: 0.19-0.51% the rests are Fe. The procedure flow of the invention comprises the steps of: squaring billet, heating, roughly and intermediately rolling, precisely rolling, performing QTB water penetration, placing on a cooling bed (cooling naturally), scaling, checking and putting into storage. The invention has the advantage that: chemical ingredients are designed diversely according to the diverse production standards of the deformed steel bar, the after-rolling remaining heat treatment procedure is used to keep the steel bar in a good plasticity and toughness.
Description
Technical background
The invention belongs to technical field of ferrous metallurgy, a kind of high-strength deformed steel bar muscle and preparation technology thereof particularly are provided.
Background technology
The Steel Concrete hot rolled ribbed steel bar is widely used a kind of critical material in the domestic and international all kinds of construction work, also is the mass-produced a kind of critical product of each steel mill of China's metallurgy industry.Fast development along with building trade, this product has been proposed higher quality standard, require its performance not only to have high strength but also have indexs such as good plasticity-, weldability, antifatigue and cohesiveness, can satisfy the needs of Highrise buildings, large span, antidetonation, high-grade construction work such as low temperature resistant, also can reach the saving steel simultaneously, the purpose that reduces cost.
Domestic most enterprise adopts micro-alloyed hot-rolled explained hereafter, and overseas enterprise adopts the Heat Treatment explained hereafter mostly, product performance can both reach standard-required substantially, but because the product user mode difference of building code approval both at home and abroad, make domestic enterprise adopt Heat Treatment explained hereafter high strength cast iron not form specification series, and have the bigger phenomenon of reinforcement property index fluctuation.
Tianjin Iron﹠Steel Co., Ltd. is at the existing novel two roller short stress path rolling mills of Italian the 5th generation of DANIELI of introducing, LTR (low temperature rolling) and QTB (quenching, self-tempering treatment process) wear on the basis of cooling process (promptly rolling the back Heat Treatment) technical superiority, fully excavate the potential of its equipment, to economize on resources to greatest extent, reduce manufacturing cost, take to come designing chemical composition, come the guaranteed performance index uniform and stable according to the product specification difference.
To be reinforcing bar finish through milling train when rolling the principle of rolling back Heat Treatment technology, has very high temperature, its metallographic structure is an austenite structure, enter refrigerating unit immediately, directly water cooling realizes quenching fast, make reinforcing bar obtain martensitic stucture on the top layer, heart portion still keeps austenitic state to leave refrigerating unit, heart portion austenite structure is in temperature-fall period subsequently, form perlite and add ferritic structure, transmission makes top layer martensite generation tempering and heart portion heat is to the surface, obtains tempered martensite, forms sorbite between heart portion and textura epidermoidea, perlite, transition tissues such as ferrite.
Back Heat Treatment technology is rolled in employing makes the top layer of reinforcing bar with heart portion different phase transformations take place, obtain the higher tempered martensite through hardening layer of intensity on the surface of reinforcing bar, obtain plasticity equilibrium state tissue preferably in heart portion, thereby keeping reinforcing bar to have good moulds, toughness when increasing substantially reinforced steel bar strength.
Summary of the invention
The object of the present invention is to provide a kind of high-strength deformed steel bar muscle and preparation technology thereof, keep reinforcing bar to have when increasing substantially reinforced steel bar strength good moulding, toughness.
The composition of high-strength deformed steel bar muscle of the present invention (%):
C:0.12～0.25, Si:0.12～0.80, Mn:0.30～1.55, P:0.01～0.035, S:0.01～0.040, carbon equivalent: 0.19～0.51, surplus is Fe.
The production specification of Twisted Steel of the present invention is 12mm～40mm, and the preferable range of different size reinforcing bar chemical ingredients sees the following form:
| Specification (mm) | C％ | Si％ | Mn％ | P％ | S％ | Carbon equivalent % |
| 12 | 0.12～0.22 | 0.12～0.30 | 0.30～0.65 | 0.01～0.035 | 0.01～0.040 | 0.19～0.33 |
| 14～20 | 0.17～0.23 | 0.12～0.30 | 0.50～0.75 | 0.01～0.035 | 0.01～0.040 | 0.25～0.36 |
| 22～25 | 0.17～0.25 | 0.40～0.80 | 1.20～1.55 | 0.01～0.035 | 0.01～0.040 | 0.37～0.51 |
| 30～40 | 0.17～0.25 | 0.20～0.60 | 1.0～1.40 | 0.01～0.035 | 0.01～.0040 | 0.34～0.49 |
The composition of reinforcing bar is identical with the composition of raw material continuous casting square billet, and the square billet composition is custom-designed for rolling high-strength degree Twisted Steel, is smelted by Tianjin Iron And Steel Company, smelts by traditional technology.
The small dimension that is easy to undergo phase transition is suitably reduced alloying element Si, Mn component content, and the difficult big specification that undergoes phase transition suitably improves alloying element Si, Mn component content.
Technical process of the present invention: square billet → heating → thick, in roll → finish rolling → QTB wears water → go up cold bed (naturally cooling) → scale → check → warehouse-in.
Processing step and parameter are as follows:
(1) raw material: 150 * 150 * 12000mm continuous casting square billet.
(2) heating process: square billet is carried out three sections heat treated, and wherein the preheating section temperature is: 800～1000 ℃; The heating zone temperature is: 1100～1170 ℃; The soaking zone temperature is: 1070～1140 ℃.Heating total time is 90～120 minutes.To rolling sequence controlled temperature (being start rolling temperature) be: 980～1060 ℃.The present invention adopts side to advance side to go out the heat accumulating type walking beam reheating furnace, and fuel is blast furnace gas.
(3) rolling technology: be divided into roughing, in roll and finish rolling.
Rolling employing 18 rolling mills do not have turns round full continuous rolling, and flat-grade separation is for arranging, the 16th, 18 rolling mills adopt flat upright convertible milling train, can convert flat or vertical mill arbitrarily to.
Roughing technology: totally 6 of roughing units, it is rolling that employing parts power a little.The 6th went out the lipstick base and is of a size of 76mm * 76mm, gap values between rollers 10mm when the Twisted Steel except that specification is 32mm, 40mm was rolling; Specification be the Twisted Steel of 32mm, 40mm when rolling the 6th go out the lipstick base and be of a size of 77.3mm * 76mm, gap values between rollers 11.3mm.
Middle roll process: totally 8 of middle milling train groups, adopt the kink control techniques, non-tension rolling.The red base size of each sortie is carried out by rolling schedule (the standard rolling schedule that milling train was equipped with).
Finish-rolling process: totally 4 of finishing train, adopt the kink control techniques, non-tension rolling, finish to gauge speed is 4.98～18m/s.Wherein specification be the Twisted Steel of 12mm and 14mm with square billet three splitting rollings, finish to gauge speed is 13.1～13.5m/s; The Twisted Steel of 16mm～20mm adopts two splitting rollings, and finish to gauge speed is 9.95～15m/s; The Twisted Steel of 20mm～40mm adopts one-strand roller, and finish to gauge speed is 4.98～18m/s; The Twisted Steel of 20mm can adopt two splitting rollings and one-strand roller.
Back 4 rolling mills are crossed when the steel tonnage reaches specified tonnage and should be changed hole slot; Pre-cutting import guide and guard, cutting import guide and guard and cutting outlet guide are not only wanted accurate centering groove, and the medullary ray of guide and guard will guarantee with the roll medullary ray perpendicular; Owing to the fluctuation of steel temperature, the variation of milling train draught etc., should in time adjust the speed of each rolling mill, make to keep parting a little the rolling and non-tension rolling of power between frame.
(4) QTB wears water (i.e. quenching, self-tempering technology): be divided into quenching, self-tempering and finally cool off three phases.Correlation parameter is: start rolling temperature is: 980～1060 ℃; Cooling water pressure is: 1.2～1.4MPa; Water cooler uses number to be: 5～15; The water coolant total flux is: 550～975m
3/ h; Be cooling time: 0.51～4.14s; Self tempering temperature is: 560～620 ℃.
According to the difference of rolled piece specification, concrete processing parameter sees the following form:
| Specification (mm) | Start rolling temperature (℃) | The water cooler number | Total flux (m 3/h) | Cooling time (s) | Self tempering temperature (℃) |
| 12～14 | 1000～1060 | 5～7 | 550～630 | 0.51～0.71 | 600～620 |
| 16～20 | 1000～1060 | 9～10 | 680～840 | 0.83～1.38 | 580～600 |
| 22～25 | 980～1030 | 15 | 830～975 | 1.25～1.62 | 560～580 |
| 30～40 | 980～1030 | 14～15 | 750～975 | 2.48～4.14 | 560～580 |
Totally two in QTB water tank, one is two cuttings and three splitting rolling common tank, one is the one-strand roller water tank.
(5) go up cold bed: naturally cooling.
The present invention adopts Italian DANIELI company continous way production line of bar, mainly comprises novel two roller short stress path rolling mills of the 5th generation of DANIELI, QTB control cold water storage cistern (rolling back Heat Treatment technology).
Advantage of the present invention: according to the different chemical ingredients of Twisted Steel specification different designs, back Heat Treatment technology is rolled in employing makes the top layer of reinforcing bar with heart portion different phase transformations take place, obtain the higher tempered martensite through hardening layer of intensity on the surface of reinforcing bar, obtain plasticity equilibrium state tissue preferably in heart portion, thereby keeping reinforcing bar to have good moulds, toughness when increasing substantially reinforced steel bar strength.Twisted Steel yield strength, tensile strength and the strong flexor ratio of each specification all is better than English mark standard, stable mechanical property.
Embodiment
Embodiment 1
Specification is the 12mm Twisted Steel: composition is: C:0.14%, and Si:0.21%, Mn:0.45%, P:0.017%, S:0.012%, carbon equivalent: 0.22%, surplus is Fe.
(1) raw material: 150 * 150 * 12000mm continuous casting square billet.
(2) heating process: square billet is carried out three sections heat treated, and wherein the preheating section temperature is: 880～930 ℃; The heating zone temperature is: 1130～1160 ℃; The soaking zone temperature is: 1100～1130 ℃.Heating total time is 95 minutes.To rolling sequence controlled temperature scope be: 1010～1040 ℃.
(3) rolling process:
Roughing technology: it is rolling that the employing of roughing unit parts power a little, and the 6th rolling mill goes out the lipstick base and is of a size of 76mm * 76mm, gap values between rollers 10mm.
Middle roll process: middle milling train group adopts kink control non-tension rolling, and the 14th rolling mill goes out the lipstick base and is of a size of 43.5mm * 18mm, gap values between rollers 6mm.
Finish-rolling process: finishing train adopts no tension force three splitting rollings of kink control, finish to gauge speed 13.5m/s.
(4) QTB wears water:
Cooling water pressure is: 1.30～1.32MPa; Water cooler uses number to be: 6; The water coolant total flux is: 560～570m
3/ h; Be cooling time: 0.61s; Self tempering temperature is: 600～620 ℃.
(5) go up cold bed: naturally cooling.
Embodiment 2
Specification is the 16mm Twisted Steel: composition is: C:0.17%, and Si:0.22%, Mn:0.66%, P:0.013%, S:0.015%, carbon equivalent: 0.28%, surplus is Fe.
(1) raw material: 150 * 150 * 12000mm continuous casting square billet.
(2) heating process: square billet is carried out three sections heat treated, and wherein the preheating section temperature is: 890～940 ℃; The heating zone temperature is: 1130～1160 ℃; The soaking zone temperature is: 1110～1140 ℃.Heating total time is 95 minutes.To rolling sequence controlled temperature scope be: 1020～1050 ℃.
(3) rolling process:
Roughing technology: it is rolling that the employing of roughing unit parts power a little, and the 6th rolling mill goes out the lipstick base and is of a size of 76mm * 76mm, gap values between rollers 10mm.
Middle roll process: middle milling train group adopts kink control non-tension rolling, and the 14th rolling mill goes out the lipstick base and is of a size of 35.5mm * 22.3mm, gap values between rollers 5mm.
Finish-rolling process: finishing train adopts no tension force two splitting rollings of kink control, finish to gauge speed 15m/s.
(4) QTB wears water:
Cooling water pressure is: 1.35～1.37MPa; Water cooler uses number to be: 9; The water coolant total flux is: 727～737m
3/ h; Be cooling time: 0.83s; Self tempering temperature is: 580～600 ℃.
(5) go up cold bed: naturally cooling
Embodiment 3
Specification is the 22mm Twisted Steel: composition is: C:0.22%, and Si:0.58%, Mn:1.32%, P:0.016%, S:0.019%, carbon equivalent: 0.44%, surplus is Fe.
(1) raw material: 150 * 150 * 12000mm continuous casting square billet.
(2) heating process: square billet is carried out three sections heat treated, and wherein the preheating section temperature is: 830～880 ℃; The heating zone temperature is: 1110～1140 ℃; The soaking zone temperature is: 1080～1110 ℃.Heating total time is 100 minutes.To rolling sequence controlled temperature scope be: 990～1020 ℃.
(3) rolling process:
Roughing technology: it is rolling that the employing of roughing unit parts power a little, and the 6th rolling mill goes out the lipstick base and is of a size of 76mm * 76mm, gap values between rollers 10mm.
Middle roll process: middle milling train group adopts kink control non-tension rolling, and the 12nd rolling mill goes out the lipstick base and is of a size of 32.4mm * 32.4mm, gap values between rollers 4.5mm.
Finish-rolling process: finishing train adopts the no tension force one-strand roller of kink control, finish to gauge speed 16.45m/s.
(4) QTB wears water:
Cooling water pressure is: 1.35～1.37MPa; Water cooler uses number to be: 15; The water coolant total flux is: 800～810m
3/ h; Be cooling time: 1.25s; Self tempering temperature is: 560～580 ℃.
(5) go up cold bed: naturally cooling.
Embodiment 4
Specification is the 40mm Twisted Steel: composition is: C:0.20%, and Si:0.54%, Mn:1.27%, P:0.016%, S:0.018%, carbon equivalent: 0.41%, surplus is Fe.
(1) raw material: 150 * 150 * 12000mm continuous casting square billet.
(2) heating process: square billet is carried out three sections heat treated, and wherein the preheating section temperature is: 890～940 ℃; The heating zone temperature is: 1110～1140 ℃; The soaking zone temperature is: 1080～1110 ℃.Heating total time is 100 minutes.To rolling sequence controlled temperature scope be: 990～1020 ℃.
(3) rolling process:
Roughing technology: it is rolling that the employing of roughing unit parts power a little, and the 6th rolling mill goes out the lipstick base and is of a size of 77.3mm * 76mm, gap values between rollers 11.3mm.
Middle roll process: middle milling train group adopts kink control non-tension rolling, and the 10th rolling mill goes out the lipstick base and is of a size of 52mm * 48mm, gap values between rollers 10.5mm.
Finish-rolling process: finishing train adopts the no tension force one-strand roller of kink control, finish to gauge speed 4.98m/s.
(4) QTB wears water:
Cooling water pressure is: 1.34～1.36MPa; Water cooler uses number to be: 14; The water coolant total flux is: 750～760m
3/ h; Be cooling time: 3.87s; Self tempering temperature is: 560～580 ℃.
(5) go up cold bed: naturally cooling.
Claims (10)
1. high-strength deformed steel bar muscle, it is characterized in that: composition is: C:0.12～0.25%, Si:0.12～0.80%, Mn:0.30～1.55%, P:0.01～0.035%, S:0.01～0.040%, carbon equivalent: 0.19～0.51%, surplus is Fe.
2. according to the described reinforcing bar of claim 1, it is characterized in that: the composition of different size reinforcing bar is:
Specification is the Twisted Steel of 12mm: the reinforcing bar composition is: C:0.12～0.22%, and Si:0.12～0.30%, Mn:0.30～0.65%, P:0.01～0.035%, S:0.01～0.040%, carbon equivalent: 0.19～0.33%, surplus is Fe;
Specification is the Twisted Steel of 14mm～20mm: the reinforcing bar composition is: C:0.17～0.23%, and Si:0.12～0.30%, Mn:0.50～0.75%, P:0.01～0.035%, S:0.01～0.040%, carbon equivalent: 0.25～0.36%, surplus is Fe;
Specification is the Twisted Steel of 22mm～25mm: the reinforcing bar composition is: C:0.17～0.25%, and Si:0.40～0.80%, Mn:1.20～1.55%, P:0.01～0.035%, S:0.01～0.040%, carbon equivalent: 0.37～0.51%, surplus is Fe;
Specification is the Twisted Steel of 30mm～40mm: the reinforcing bar composition is: C:0.17～0.25%, and Si:0.20～0.60%, Mn:1.0～1.40%, P:0.01～0.035%, S:0.01～0.040%, carbon equivalent: 0.34～0.49%, surplus is Fe.
3. technology for preparing the described Twisted Steel of claim 1, it is characterized in that: processing step is: the raw material continuous casting square billet is through heat treated, enter thick, in roll operation, enter the finish rolling operation again, carry out QTB then and wear water treatment, go up cold bed naturally cooling, scale, check, warehouse-in at last.
4. according to the described technology of claim 3, it is characterized in that: described continuous casting square billet is of a size of: 150 * 150 * 12000mm; The Twisted Steel specification is: 12mm～40mm; The continuous casting square billet composition is: C:0.12～0.25%, and Si:0.12～0.80%, Mn:0.30～1.55%, P:0.01～0.035%, S:0.01～0.040%, carbon equivalent: 0.19～0.51%, surplus is Fe.
5. according to the described technology of claim 3, it is characterized in that: the composition of producing the continuous casting square billet of different size reinforcing bar use is:
Specification is the Twisted Steel of 12mm: the continuous casting square billet composition is: C:0.12～0.22%, and Si:0.12～0.30%, Mn:0.30～0.65%, P:0.01～0.035%, S:0.01～0.040%, carbon equivalent: 0.19～0.33%, surplus is Fe;
Specification is the Twisted Steel of 14mm～20mm: the continuous casting square billet composition is: C:0.17～0.23%, and Si:0.12～0.30%, Mn:0.50～0.75%, P:0.01～0.035%, S:0.01～0.040%, carbon equivalent: 0.25～0.36%, surplus is Fe;
Specification is the Twisted Steel of 22mm～25mm: the continuous casting square billet composition is: C:0.17～0.25%, and Si:0.40～0.80%, Mn:1.20～1.55%, P:0.01～0.035%, S:0.01～0.040%, carbon equivalent: 0.37～0.51%, surplus is Fe;
Specification is the Twisted Steel of 30mm～40mm: the continuous casting square billet composition is: C:0.17～0.25%, Si:0.20～0.60%, Mn; 1.0～1.40%, P:0.01～0.035%, S:0.01～0.040%, carbon equivalent: 0.34～0.49%, surplus is Fe.
6. according to the described technology of claim 3, it is characterized in that: described heating process: the preheating section temperature is: 800～1000 ℃, the heating zone temperature is: 1100～1170 ℃, the soaking zone temperature is: 1070～1140 ℃; Heating total time is 90～120 minutes; Start rolling temperature is: 980～1060 ℃.
7. according to the described technology of claim 6, it is characterized in that: the start rolling temperature scope of rolling different size reinforcing bar is in the described heating process:
Rolling specs is the Twisted Steel of 12mm～20mm, start rolling temperature: 1000～1060 ℃;
Rolling specs is the Twisted Steel of 22mm～40mm, start rolling temperature: 980～1030 ℃.
8. according to the described technology of claim 3, it is characterized in that: described rolling technology be divided into roughing, in roll and finish rolling:
(1) roughing technology: totally 6 of roughing units, it is rolling that employing parts power a little; The 6th went out the lipstick base and is of a size of 76mm * 76mm, gap values between rollers 10mm when the Twisted Steel except that specification is 32mm, 40mm was rolling; Specification be the Twisted Steel of 32mm, 40mm when rolling the 6th go out the lipstick base and be of a size of 77.3mm * 76mm, gap values between rollers 11.3mm;
(2) roll process in: totally 8 of middle milling train groups, adopt the kink control techniques, non-tension rolling.The red base size of each sortie is pressed rolling schedule and is carried out.
(3) finish-rolling process: totally 4 of finishing train, adopt the kink control techniques, non-tension rolling, finish to gauge speed is 4.98～18m/s.
9. according to the described technology of claim 3, it is characterized in that: described QTB wears the water conservancy project skill: cooling water pressure is: 1.2～1.4MPa; Water cooler uses number to be: 5～15; The water coolant total flux is: 550～975m
3/ h; Be cooling time: 0.51～4.14s; Self tempering temperature is: 560～620 ℃.
10. according to the described technology of claim 9, it is characterized in that: described QTB wears water conservancy project skill and for the processing parameter of the reinforcing bar of producing different size is:
Specification is the Twisted Steel of 12mm～14mm: water cooler uses number to be: 5～7; The water coolant total flux is: 550～630m
3/ h; Be cooling time: 0.51～0.71s; Self tempering temperature is: 600～620 ℃;
Specification is the Twisted Steel of 16mm～20mm: water cooler uses number to be: 9～10; The water coolant total flux is: 680～840m
3/ h; Be cooling time: 0.83～1.38s; Self tempering temperature is: 580～600 ℃;
Specification is the Twisted Steel of 22mm～25mm: water cooler uses number to be: 15; The water coolant total flux is: 830～975m
3/ h; Be cooling time: 1.25～1.62s; Self tempering temperature is: 560～580 ℃;
Specification is the Twisted Steel of 30mm～40mm: water cooler uses number to be: 14～15; The water coolant total flux is: 750～975m
3/ h; Be cooling time: 2.48～4.14s; Self tempering temperature is: 560～580 ℃.
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2007
- 2007-07-19 CN CNB2007101192954A patent/CN100513614C/en not_active Expired - Fee Related
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