CN103805847A - Optical round wire rod reinforcement bar for producing prestressed concrete steel rod and processing method - Google Patents
Optical round wire rod reinforcement bar for producing prestressed concrete steel rod and processing method Download PDFInfo
- Publication number
- CN103805847A CN103805847A CN201410082260.8A CN201410082260A CN103805847A CN 103805847 A CN103805847 A CN 103805847A CN 201410082260 A CN201410082260 A CN 201410082260A CN 103805847 A CN103805847 A CN 103805847A
- Authority
- CN
- China
- Prior art keywords
- steel
- amount
- add
- prestressed concrete
- reinforcing bar
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses an optical round wire rod reinforcement bar for producing a prestressed concrete steel rod and a processing method. A steel blank comprises in percentage by weight: 0.25-0.30% of C, 0.90-1.10% of Si, 0.50-0.70% of Mn, 0.015-0.030% of Nb, 0.0020-0.0040% of B, no more than 0.020% of S, no more than 0.020% of P and the balance of Fe and inevitable impurities; the optical round wire rod reinforcement bar with the nominal diameter of 8.0-14.0mm is produced by heating and performing controlled rolling and controlled cooling to the steel blank, and has the following characteristics that the tensile strength (Rm) is 630-660MPa, the percentage reduction of area is more than or equal to 65%, and the ferrite grain size is 10.0-11.5 level. Through integration and creation of converter melting, LF melting, steel blank heading and multiple technology of standard and delay type controlled rolling and controlling cooling and the like, the invention provides a production method of the optical round wire rod reinforcement bar for producing the prestressed concrete steel rod, and the product is high in hardenability, and uniform in microscopic structure. The method has the advantages of excellent quality, low production cost, good processability, strong popularization and the like.
Description
Technical field
The invention belongs to metal material processing and field shaping technique, be specifically related to a kind of for making light coil rod reinforcing bar and the working method of prestressed concrete steel stick.
Background technology
Steel bar for prestressed concrete (also claiming PC rod iron) is a kind of efficient, energy-conservation New Building Materials, develop and promote the use of and see the earliest last century eight, the Japan of the nineties, it is take gren rod as raw material, adopt " drawing tube reducing → indentation → quenching → tempering " explained hereafter, product has high-strong toughness, underrelaxation, good weldability, good upsetting, the features such as good concrete binding, be widely used in the high pre-stress member of all kinds of construction works, as: the centrifugal pile tube of high-strength prestressed concrete, electric pole, overhead bridge pier, in railroad sleeper high pre-stress member.Due to the raising of intensity and performance, can significantly reduce steel usage quantity, improve steel service efficiency, be conducive to create conservation-minded society.Along with efficient, the energy-conservation advantage of steel bar for prestressed concrete product by domestic increasing construction work investor and design department cognition, use the construction work of steel bar for prestressed concrete more and more.
Along with the market demand of steel bar for prestressed concrete rises, the increasing of rod iron production line, the extraordinary light coil rod reinforcing bar of producing PC rod iron more and more becomes a restrictive key link, due to the quality problems of extraordinary light coil rod reinforcing bar, cause producing, use steel bar for prestressed concrete to occur a series of problem, as: steel are frequently fracture in drawing tube reducing process, rod iron strength fluctuation is large, elongation is on the low side, and delayed fracture etc. in use occurs rod iron.The generation of these problems, the one, affect the construction speed that uses the construction work of steel bar for prestressed concrete, affect the enthusiasm of construction investment side's use novel high-efficiency and energy-saving material, cause applying of steel bar for prestressed concrete to be subject to prolonging resistance; The 2nd, the enthusiasm of rod iron manufacturing enterprise is affected, economic interests incur loss.Therefore the heat calendering coil rod reinforcing bar of, researching and developing a kind of steady quality and meeting steel bar for prestressed concrete processing request is that building trade is popularized this key efficient, energy saving material of application steel bar for prestressed concrete in an all-round way.
Summary of the invention
The object of the present invention is to provide a kind of for making light coil rod reinforcing bar and the working method of prestressed concrete steel stick.
It is a kind of for making the light coil rod reinforcing bar of prestressed concrete steel stick that the first object of the present invention is to provide, the advantage such as there is few, the easy processing of oxide skin, mould loss is low, hardening capacity is high, microstructure is even, the prestressed concrete steel stick that this product is produced has intensity easy-regulating, without delayed fracture, without cold-upsetting cracks, recovery rate of iron advantages of higher, realized the economic production of prestressed concrete steel stick and promoted the use of; The second object is to provide a kind of smelting, rolling this for making the working method of light coil rod reinforcing bar of prestressed concrete steel stick.
The first object of the present invention is to realize like this, described steel billet forms C:0.25～0.30wt% by weight percentage, Si:0.90～1.10 wt%, Mn:0.50～0.70 wt%, Nb:0.015～0.030 wt%, B:0.0020～0.0040 wt%, S≤0.020 wt%, P≤0.020wt%, all the other are Fe and inevitable impurity; Described steel billet makes by heating, controlled rolling and controlled cooling operation the light coil rod reinforcing bar that nominal diameter is 8.0～14.0mm.
The second object of the present invention is achieved in that and comprises smelting molten steel and deoxidation alloying, the refining of molten steel LF stove, molten steel casting, heating steel billet, controlled rolling and controlled cooling operation, it is characterized in that: specifically comprise following process:
A, smelting molten steel and deoxidation alloying: by molten iron (chemical composition C 4.0-5.5wt%, Si 0.30-0.80wt%, Mn 0.25-0.70wt%, P 0.110-0.170wt%, S≤0.015wt%, all the other are Fe and inevitable impurity), steel scrap (chemical composition C 0.20-0.35wt%, Si 0.25-0.55 wt%, Mn 0.30-1.00 wt%, P 0.030-0.055wt%, S 0.020-0.040wt%, all the other are Fe and inevitable impurity) and the pig iron (chemical composition C 3.2-4.0 wt%, Si 0.40-0.70 wt%, Mn 0.25-0.60 wt%, P 0.070-0.110wt%, S 0.010-0.020wt%, all the other are Fe and inevitable impurity) add in LD converter, carry out conventional top bottom blowing, amount adds lime routinely, rhombspar, the slag making of magnesite ball, controlling endpoint carbon content is 0.06～0.10 wt%, tapping temperature is 1655～1675 ℃, tapping forward direction ladle bottom adds lime to carry out wash heat, lime adding amount is: 4.0kg/t steel, tapping process adopts omnidistance bottom argon blowing technology, argon flow amount control is 15～30NL/min, in the time that the molten steel amount in ladle is greater than 1/4, in ladle, add following material successively: by the amount of 6.1～9.0kg/t steel, add the high carbon ferromanganese of following mass ratio: Mn 75.6wt%, C 16.7wt%, all the other are Fe and inevitable impurity, by the amount of 14.5～17.5kg/t steel, add the ferro-silicon of following mass ratio: Si 73.5wt%, all the other are Fe and inevitable impurity, by the amount of 0.25～0.50 kg/t steel, add the ferro-niobium of following mass ratio: Nb 64.5wt%, all the other are Fe and inevitable impurity, by the amount of 1.5～1.9kg/t steel, add the carburelant of following mass ratio: C 92.53wt%, S 0.085wt%, ash 4.15wt%, fugitive constituent 1.64wt%, moisture content 0.75wt%, all the other are inevitable impurity, reach at 3/4 o'clock in ladle molten steel amount and add above-mentioned alloy and carburelant, after tapping, molten steel is hung and delivers to LF stove refining station,
B, the refining of molten steel LF stove: molten steel is winched to LF stove refining station and connect argon gas band, open argon gas and adopt little argon amount (15～25NL/min) Argon 2 minutes, then lower electrode adopts 7～9 grades of gears to change slag; Switch on after 3 minutes, lift electrode and observe stove internalization slag situation, thermometric, sampling afterwards; If slag condition is rarer, add lime 2.0～4.0kg/t steel, then add calcium carbide 0.5 kg/t steel residue adjustment, controlling basicity of slag is 5.0～7.0; Press the amount of 0.3kg/t steel, add the ferro-boron of following mass ratio: B 16.5wt%, all the other are Fe and inevitable impurity; After afterwards liquid steel temperature being heated to 1580～1595 ℃, carry out wire feeding process, feeding has the silicon-calcium wire of following mass 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 150m; It is that the little argon gas amount of 20～30NL/min is carried out soft blow argon to molten steel that line feeding finishes to adopt flow, and the soft blow time is 10 minutes, adds afterwards molten steel covering agent, and add-on control is 1.0 kg/t steel, then molten steel is winched to casting station;
C, molten steel casting: be 1520～1535 ℃ at tundish temperature, pulling rate is 1.8～2.0m/min, two cold specific waters are 1.4～1.6L/kg, M-EMS Current intensity is under 250A, the running frequency condition that is 2.5HZ, adopts little square billet casting machine the continuous casting of molten steel of B step to be become to the steel billet of section 150mm × 150mm;
D, heating steel billet: it is in the process furnace of 1100～1150 ℃ that steel billet is sent into soaking zone furnace temperature, heat 60～80 minutes, steel billet tapping temperature is 980～1020 ℃, go out squama by high pressure water, the 5 base positions that push to before inlet of rolling mill treat that warm area carries out the naturally cooling of 3～5 minutes, finally enter mill milling with the start rolling temperature of 910～930 ℃;
E, controlled rolling and controlled cooling: the steel billet after heating is sent into high-speed rod-rolling mill and be rolled, entering final rolling temperature control is 820～840 ℃, and laying temperature control is 825～835 ℃; After weaving silk, enter stelmo line air-cooled line and carry out " standard+delay " type control cooling (fast cooling+Slow cooling).When rolling, blower fan is opened first 1～3, opens corresponding blower fan top insulation cover, air quantity 100%, good clever 3 grades simultaneously; All the other blower fan Close Alls are closed corresponding blower fan top insulation cover simultaneously, and the control of first and last section roller table speed is 0.30～0.40m/s; After the air-cooled end of stelmor, collecting the control of volume temperature is 450～550 ℃, then will coil natural air cooling to room temperature, obtains a kind of for making the light coil rod reinforcing bar of prestressed concrete steel stick.
The present invention is by Alternative integrated innovations such as converter smelting, the refining of LF stove, heating steel billet and the control of high line " standard+delay " type are cold, provide a kind of for making the light coil rod reinforcing bar of prestressed concrete steel stick, the advantage such as there is few, the easy processing of oxide skin, mould loss is low, hardening capacity is high, microstructure is even, the prestressed concrete steel stick that this product is produced has intensity easy-regulating, without delayed fracture, without cold-upsetting cracks, recovery rate of iron advantages of higher, realized the economic production of prestressed concrete steel stick and promoted the use of.Adopt this explained hereafter for making the light coil rod reinforcing bar of prestressed concrete steel stick, its tensile strength (Rm): 630～660MPa, relative reduction in area >=65%, 10.0～11.5 grades of ferrite grain sizes.The advantage such as the inventive method has that good quality, production cost are low, good processability, generalization are strong.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated, but never in any form the present invention is limited, and any change or the improvement done based on training centre of the present invention, all belong to protection scope of the present invention.
Described steel billet composition is C:0.25～0.30wt% by weight percentage, Si:0.90～1.10 wt%, Mn:0.50～0.70 wt%, Nb:0.015～0.030 wt%, B:0.0020～0.0040 wt%, S≤0.020 wt%, P≤0.020wt%, all the other are Fe and inevitable impurity; Described steel billet makes by heating, controlled rolling and controlled cooling operation the light coil rod reinforcing bar that nominal diameter is 8.0～14.0mm.
Described light coil rod reinforcing bar has following characteristic: tensile strength (Rm): 630～660MPa, relative reduction in area >=65%, 10.0～11.5 grades of ferrite grain sizes.
The inventive method comprises smelting molten steel and deoxidation alloying, the refining of molten steel LF stove, molten steel casting, heating steel billet, controlled rolling and controlled cooling operation, it is characterized in that: specifically comprise following process:
Described smelting molten steel and deoxidation alloying are by molten iron (chemical composition C 4.0-5.5wt%, Si 0.30-0.80wt%, Mn 0.25-0.70wt%, P 0.110-0.170wt%, S≤0.015wt%, all the other are Fe and inevitable impurity), steel scrap (chemical composition C 0.20-0.35wt%, Si 0.25-0.55 wt%, Mn 0.30-1.00 wt%, P 0.030-0.055wt%, S 0.020-0.040wt%, all the other are Fe and inevitable impurity) and the pig iron (chemical composition C 3.2-4.0 wt%, Si 0.40-0.70 wt%, Mn 0.25-0.60 wt%, P 0.070-0.110wt%, S 0.010-0.020wt%, all the other are Fe and inevitable impurity) add in LD converter, carry out conventional top bottom blowing, amount adds lime routinely, rhombspar, the slag making of magnesite ball, controlling endpoint carbon content is 0.06～0.10 wt%, tapping temperature is 1655～1675 ℃, tapping forward direction ladle bottom adds lime to carry out wash heat, lime adding amount is: 4.0kg/t steel, tapping process adopts omnidistance bottom argon blowing technology, argon flow amount control is 15～30NL/min, in the time that the molten steel amount in ladle is greater than 1/4, in ladle, add following material successively: by the amount of 6.1～9.0kg/t steel, add the high carbon ferromanganese of following mass ratio: Mn 75.6wt%, C 16.7wt%, all the other are Fe and inevitable impurity, by the amount of 14.5～17.5kg/t steel, add the ferro-silicon of following mass ratio: Si 73.5wt%, all the other are Fe and inevitable impurity, by the amount of 0.25～0.50 kg/t steel, add the ferro-niobium of following mass ratio: Nb 64.5wt%, all the other are Fe and inevitable impurity, by the amount of 1.5～1.9kg/t steel, add the carburelant of following mass ratio: C 92.53wt%, S 0.085wt%, ash 4.15wt%, fugitive constituent 1.64wt%, moisture content 0.75wt%, all the other are inevitable impurity, reach at 3/4 o'clock in ladle molten steel amount and add above-mentioned alloy and carburelant, after tapping, molten steel is hung and delivers to LF stove refining station,
Described molten steel LF stove refining is molten steel to be winched to LF stove refining station connect argon gas band, opens argon gas and adopts little argon amount (15～25NL/min) Argon 2 minutes, and then lower electrode adopts 7～9 grades of gears to change slag; Switch on after 3 minutes, lift electrode and observe stove internalization slag situation, thermometric, sampling afterwards; If slag condition is rarer, add lime 2.0～4.0kg/t steel, then add calcium carbide 0.5 kg/t steel residue adjustment, controlling basicity of slag is 5.0～7.0; Press the amount of 0.3kg/t steel, add the ferro-boron of following mass ratio: B 16.5wt%, all the other are Fe and inevitable impurity; After afterwards liquid steel temperature being heated to 1580～1595 ℃, carry out wire feeding process, feeding has the silicon-calcium wire of following mass 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 150m; It is that the little argon gas amount of 20～30NL/min is carried out soft blow argon to molten steel that line feeding finishes to adopt flow, and the soft blow time is 10 minutes, adds afterwards molten steel covering agent, and add-on control is 1.0 kg/t steel, then molten steel is winched to casting station;
Described molten steel casting is to be 1520～1535 ℃ at tundish temperature, pulling rate is 1.8～2.0m/min, two cold specific waters are 1.4～1.6L/kg, M-EMS Current intensity is under 250A, the running frequency condition that is 2.5HZ, adopts little square billet casting machine the continuous casting of molten steel of B step to be become to the steel billet of section 150mm × 150mm;
Described heating steel billet is that steel billet is sent into soaking zone furnace temperature is in the process furnace of 1100～1150 ℃, heat 60～80 minutes, steel billet tapping temperature is 980～1020 ℃, go out squama by high pressure water, the 5 base positions that push to before inlet of rolling mill treat that warm area carries out the naturally cooling of 3～5 minutes, finally enter mill milling with the start rolling temperature of 910～930 ℃;
Described controlled rolling and controlled cooling is the steel billet after heating to be sent into high-speed rod-rolling mill be rolled, and entering final rolling temperature control is 820～840 ℃, and laying temperature control is 825～835 ℃; After weaving silk, enter stelmo line air-cooled line and carry out " standard+delay " type control cooling (fast cooling+Slow cooling).When rolling, blower fan is opened first 1～3, opens corresponding blower fan top insulation cover, air quantity 100%, good clever 3 grades simultaneously; All the other blower fan Close Alls are closed corresponding blower fan top insulation cover simultaneously, and the control of first and last section roller table speed is 0.30～0.40m/s; After the air-cooled end of stelmor, collecting the control of volume temperature is 450～550 ℃, then will coil natural air cooling to room temperature, obtains a kind of for making the light coil rod reinforcing bar of prestressed concrete steel stick.
Described little square billet casting machine is R9m, and 5 machines 5 flow.
Described heating steel billet completes by side inlet side outlet walking beam double heat storage type process furnace.
The length of described de-scaling high-pressure water tank is 1.1 ~ 1.5m.
Described stelmo line air-cooled line total length 93m, along rolling direction 12 Fans of evenly arranging.
Described steel billet temperature control, blower fan and insulation cover opened number, roller table speed requires concrete definite depending on different size.
Described high-speed rod-rolling mill arranges 28 frames.
embodiment 1
The described chemical composition for making the light coil rod reinforcing bar of prestressed concrete steel stick with following weight percent: C 0.25wt%, Si 0.90wt%, Mn 0.50wt%, Nb 0.015wt%, B 0.0020 wt%, P 0.020 wt%, S 0.020 wt%, all the other are Fe and inevitable impurity.Through following operation processing, the light coil rod reinforcing bar that acquisition diameter is 8.0mm:
Described smelting molten steel and deoxidation alloying are by molten iron (chemical composition C 4.0wt%, Si 0.30wt%, Mn 0.25wt%, P 0.170wt%, S 0.015wt%, all the other are Fe and inevitable impurity), steel scrap (chemical composition C 0.20wt%, Si 0.25 wt%, Mn 0.30 wt%, P 0.055 wt%, S 0.040 wt%, all the other are Fe and inevitable impurity) and the pig iron (chemical composition C 3.2 wt%, Si 0.40 wt%, Mn 0.25 wt%, P 0.110wt%, S 0.020wt%, all the other are Fe and inevitable impurity) add in LD converter, carry out conventional top bottom blowing, amount adds lime routinely, rhombspar, the slag making of magnesite ball, controlling endpoint carbon content is 0.06 wt%, tapping temperature is 1675 ℃, tapping forward direction ladle bottom adds lime to carry out wash heat, lime adding amount is: 4.0kg/t steel, tapping process adopts omnidistance bottom argon blowing technology, argon flow amount control is 15NL/min, in the time that the molten steel amount in ladle is greater than 1/4, in ladle, add following material successively: by the amount of 6.1kg/t steel, add the high carbon ferromanganese of following mass ratio: Mn 75.6wt%, C 16.7wt%, all the other are Fe and inevitable impurity, press the amount of 14.5kg/t steel, add the ferro-silicon of following mass ratio: Si 73.5wt%, all the other are Fe and inevitable impurity, by the amount of 0.25 kg/t steel, add the ferro-niobium of following mass ratio: Nb 64.5wt%, all the other are Fe and inevitable impurity, press the amount of 1.5kg/t steel, add the carburelant of following mass ratio: C 92.53wt%, S 0.085wt%, ash 4.15wt%, fugitive constituent 1.64wt%, moisture content 0.75wt%, all the other are inevitable impurity, reach at 3/4 o'clock in ladle molten steel amount and add above-mentioned alloy and carburelant, after tapping, molten steel is hung and delivers to LF stove refining station,
Described molten steel LF stove refining is molten steel to be winched to LF stove refining station connect argon gas band, opens argon gas and adopts little argon amount (15NL/min) Argon 2 minutes, and then lower electrode adopts 7～9 grades of gears to change slag; Switch on after 3 minutes, lift electrode and observe stove internalization slag situation, thermometric, sampling afterwards; If slag condition is rarer, add lime 2.0kg/t steel, then add calcium carbide 0.5 kg/t steel residue adjustment, controlling basicity of slag is 5.0; Press the amount of 0.3kg/t steel, add the ferro-boron of following mass ratio: B 16.5wt%, all the other are Fe and inevitable impurity; After afterwards liquid steel temperature being heated to 1595 ℃, carry out wire feeding process, feeding has the silicon-calcium wire of following mass 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 150m; It is that the little argon gas amount of 20NL/min is carried out soft blow argon to molten steel that line feeding finishes to adopt flow, and the soft blow time is 10 minutes, adds afterwards molten steel covering agent, and add-on control is 1.0 kg/t steel, then molten steel is winched to casting station;
Described molten steel casting is to be 1535 ℃ at tundish temperature, pulling rate is 2.0m/min, two cold specific waters are 1.6L/kg, M-EMS Current intensity is under 250A, the running frequency condition that is 2.5HZ, adopts R9m 5 machines 5 to flow little square billet casting machine the continuous casting of molten steel of B step is become the steel billet of section 150mm × 150mm;
Described heating steel billet is that steel billet is sent into soaking zone furnace temperature is in the heat accumulating type walking beam reheating furnace of 1100 ℃, heat 80 minutes, steel billet tapping temperature is 980 ℃, go out squama by high pressure water, the 5 base positions that push to before inlet of rolling mill treat that warm area carries out the naturally cooling of 3 minutes, finally enter mill milling with the start rolling temperature of 910 ℃;
Described controlled rolling and controlled cooling is the steel billet after heating have been sent into 28 frame high-speed rod-rolling mills be rolled, and entering final rolling temperature control is 820 ℃, and laying temperature control is 825 ℃; When rolling, blower fan is opened First (1#) above, opens 1# blower fan top insulation cover, air quantity 100%, good clever 3 grades; All the other blower fan Close Alls are closed corresponding blower fan top insulation cover simultaneously, and the control of first and last section roller table speed is 0.30～0.40m/s; After the air-cooled end of stelmor, collecting the control of volume temperature is 450 ℃, then will coil natural air cooling to room temperature, obtains a kind of for making the nominal diameter 8.0mm light coil rod reinforcing bar of prestressed concrete steel stick.
Its tensile strength Rm is 660 MPa, relative reduction in area 70%, 11.5 grades of ferrite grain sizes.
embodiment 2
The described chemical composition for making the light coil rod reinforcing bar of prestressed concrete steel stick with following weight percent: C 0.28wt%, Si 1.00wt%, Mn 0.60wt%, Nb 0.023wt%, B 0.0030 wt%, P 0.017 wt%, S 0.016 wt%, all the other are Fe and inevitable impurity.Through following operation processing, the light coil rod reinforcing bar that acquisition diameter is 12.0mm:
Described smelting molten steel and deoxidation alloying are by molten iron (chemical composition C 5.0wt%, Si 0.60wt%, Mn 0.55wt%, P 0.145wt%, S 0.012wt%, all the other are Fe and inevitable impurity), steel scrap (chemical composition C 0.30wt%, Si 0.40wt%, Mn 0.65 wt%, P 0.045 wt%, S 0.030wt%, all the other are Fe and inevitable impurity) and the pig iron (chemical composition C 3.6 wt%, Si 0.55 wt%, Mn 0.45 wt%, P 0.090 wt%, S 0.016 wt%, all the other are Fe and inevitable impurity) add in LD converter, carry out conventional top bottom blowing, amount adds lime routinely, rhombspar, the slag making of magnesite ball, control endpoint carbon content is 0.08wt%, tapping temperature is 1660 ℃, tapping forward direction ladle bottom adds lime to carry out wash heat, lime adding amount is: 4.0kg/t steel, tapping process adopts omnidistance bottom argon blowing technology, argon flow amount control is 28NL/min, in the time that the molten steel amount in ladle is greater than 1/4, in ladle, add following material successively: by the amount of 8.0 kg/t steel, add the high carbon ferromanganese of following mass ratio: Mn 75.6wt%, C 16.7wt%, all the other are Fe and inevitable impurity, by the amount of 16.0 kg/t steel, add the ferro-silicon of following mass ratio: Si 73.5wt%, all the other are Fe and inevitable impurity, by the amount of 0.40 kg/t steel, add the ferro-niobium of following mass ratio: Nb 64.5wt%, all the other are Fe and inevitable impurity, by the amount of 1.7 kg/t steel, add the carburelant of following mass ratio: C 92.53wt%, S 0.085wt%, ash 4.15wt%, fugitive constituent 1.64wt%, moisture content 0.75wt%, all the other are inevitable impurity, reach at 3/4 o'clock in ladle molten steel amount and add above-mentioned alloy and carburelant, after tapping, molten steel is hung and delivers to LF stove refining station,
Described molten steel LF stove refining is complete tapping molten steel to be winched to LF stove refining station connect argon gas band, opens argon gas and adopts little argon amount (20NL/min) Argon 2 minutes, and then lower electrode adopts 7～9 grades of gears to change slag; Switch on after 3 minutes, lift electrode and observe stove internalization slag situation, thermometric, sampling afterwards; If slag condition is rarer, add lime 3.5kg/t steel, then add calcium carbide 0.5 kg/t steel residue adjustment, controlling basicity of slag is 6.0; Press the amount of 0.3kg/t steel, add the ferro-boron of following mass ratio: B 16.5wt%, all the other are Fe and inevitable impurity; After afterwards liquid steel temperature being heated to 1590 ℃, carry out wire feeding process, feeding has the silicon-calcium wire of following mass 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 150m; It is that the little argon gas amount of 25NL/min is carried out soft blow argon to molten steel that line feeding finishes to adopt flow, and the soft blow time is 10 minutes, adds afterwards molten steel covering agent, and add-on control is 1.0 kg/t steel, then molten steel is winched to casting station;
Described molten steel casting is to be 1530 ℃ at tundish temperature, pulling rate is 1.9m/min, two cold specific waters are 1.5L/kg, M-EMS Current intensity is under 250A, the running frequency condition that is 2.5HZ, adopts R9m 5 machines 5 to flow little square billet casting machine the continuous casting of molten steel of B step is become the steel billet of section 150mm × 150mm;
Described heating steel billet is that steel billet is sent into soaking zone furnace temperature is in the heat accumulating type walking beam reheating furnace of 1125 ℃, heat 70 minutes, steel billet tapping temperature is 1000 ℃, go out squama by high pressure water, the warm area for the treatment of that pushes to 5 base positions carries out the naturally cooling of 4 minutes, finally enters mill milling with the start rolling temperature of 920 ℃;
Described controlled rolling and controlled cooling is steel billet have been sent into 28 frame high-speed rod-rolling mills be rolled, and entering final rolling temperature control is 830 ℃, and laying temperature control is 830 ℃; When rolling, blower fan is opened two (1#, 2#) above, opens 1#, 2# blower fan top insulation cover, air quantity 100%, good clever 3 grades; All the other blower fan Close Alls are closed corresponding blower fan top insulation cover simultaneously, and the control of first and last section roller table speed is 0.30～0.40m/s; After the air-cooled end of stelmor, collecting the control of volume temperature is 490 ℃, then will coil natural air cooling to room temperature, obtains a kind of for making the nominal diameter 12.0mm light coil rod reinforcing bar of prestressed concrete steel stick.
Its tensile strength Rm is 645 MPa, relative reduction in area 69%, 10.5 grades of ferrite grain sizes.
embodiment 3
The described chemical composition for making the light coil rod reinforcing bar of prestressed concrete steel stick with following weight percent: C 0.30wt%, Si 1.10wt%, Mn 0.70wt%, Nb 0.030wt%, B 0.0040 wt%, P 0.012wt%, S 0.013 wt%, all the other are Fe and inevitable impurity.Through following operation processing, the light coil rod reinforcing bar that acquisition diameter is 14.0mm:
Described smelting molten steel and deoxidation alloying are by molten iron (chemical composition C 5.5wt%, Si 0.80wt%, Mn 0.70wt%, P 0.110 wt%, S 0.010wt%, all the other are Fe and inevitable impurity), steel scrap (chemical composition C 0.35wt%, Si 0.55 wt%, Mn 1.00 wt%, P 0.030 wt%, S 0.020 wt%, all the other are Fe and inevitable impurity) and the pig iron (chemical composition C 3.6 wt%, Si 0.55 wt%, Mn 0.40 wt%, P 0.070 wt%, S 0.010wt%, all the other are Fe and inevitable impurity) add in LD converter, carry out conventional top bottom blowing, amount adds lime routinely, rhombspar, the slag making of magnesite ball, controlling endpoint carbon content is 0.10 wt%, tapping temperature is 1655 ℃, tapping forward direction ladle bottom adds lime to carry out wash heat, lime adding amount is: 4.0kg/t steel, tapping process adopts omnidistance bottom argon blowing technology, argon flow amount control is 30NL/min, in the time that the molten steel amount in ladle is greater than 1/4, in ladle, add following material successively: by the amount of 9.0kg/t steel, add the high carbon ferromanganese of following mass ratio: Mn 75.6wt%, C 16.7wt%, all the other are Fe and inevitable impurity, press the amount of 17.5kg/t steel, add the ferro-silicon of following mass ratio: Si 73.5wt%, all the other are Fe and inevitable impurity, by the amount of 0.50 kg/t steel, add the ferro-niobium of following mass ratio: Nb 64.5wt%, all the other are Fe and inevitable impurity, press the amount of 1.9kg/t steel, add the carburelant of following mass ratio: C 92.53wt%, S 0.085wt%, ash 4.15wt%, fugitive constituent 1.64wt%, moisture content 0.75wt%, all the other are inevitable impurity, reach at 3/4 o'clock in ladle molten steel amount and add above-mentioned alloy and carburelant, after tapping, molten steel is hung and delivers to LF stove refining station,
Described molten steel LF stove refining is complete tapping molten steel to be winched to LF stove refining station connect argon gas band, opens argon gas and adopts little argon amount (25NL/min) Argon 2 minutes, and then lower electrode adopts 7～9 grades of gears to change slag; Switch on after 3 minutes, lift electrode and observe stove internalization slag situation, thermometric, sampling afterwards; If slag condition is rarer, add lime 4.0kg/t steel, then add calcium carbide 0.5 kg/t steel residue adjustment, controlling basicity of slag is 7.0; Press the amount of 0.3kg/t steel, add the ferro-boron of following mass ratio: B 16.5wt%, all the other are Fe and inevitable impurity; After afterwards liquid steel temperature being heated to 1580 ℃, carry out wire feeding process, feeding has the silicon-calcium wire of following mass 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 150m; It is that the little argon gas amount of 20～30NL/min is carried out soft blow argon to molten steel that line feeding finishes to adopt flow, and the soft blow time is 10 minutes, adds afterwards molten steel covering agent, and add-on control is 1.0 kg/t steel, then molten steel is winched to casting station;
Described molten steel casting is to be 1520 ℃ at tundish temperature, pulling rate is 1.8m/min, two cold specific waters are 1.4L/kg, M-EMS Current intensity is under 250A, the running frequency condition that is 2.5HZ, adopts R9m 5 machines 5 to flow little square billet casting machine the continuous casting of molten steel of B step is become the steel billet of section 150mm × 150mm;
Described heating steel billet is that steel billet is sent into soaking zone furnace temperature is in the heat accumulating type walking beam reheating furnace of 1150 ℃, heat 60 minutes, steel billet tapping temperature is 1020 ℃, go out squama by high pressure water, the warm area for the treatment of that pushes to 5 base positions carries out the naturally cooling of 5 minutes, finally enters mill milling with the start rolling temperature of 930 ℃;
Described controlled rolling and controlled cooling is steel billet have been sent into 28 frame high-speed rod-rolling mills be rolled, and entering final rolling temperature control is 840 ℃, and laying temperature control is 835 ℃; When rolling, blower fan is opened three (1#, 2#, 3#) above, opens 1#, 2#, 3# blower fan top insulation cover, air quantity 100%, good clever 3 grades; All the other blower fan Close Alls are closed corresponding blower fan top insulation cover simultaneously, and the control of first and last section roller table speed is 0.30～0.40m/s; After the air-cooled end of stelmor, collecting the control of volume temperature is 550 ℃, then will coil natural air cooling to room temperature, obtains a kind of for making the 14.0mm light coil rod reinforcing bar of prestressed concrete steel stick.
Its tensile strength Rm is 630MPa, relative reduction in area 65.0%, 10.0 grades of ferrite grain sizes.
principle of work of the present invention and working process:
The present invention is by Alternative integrated innovations such as converter smelting, the refining of LF stove, heating steel billet and the control of high line " standard+delay " type are cold, provide a kind of for making the light coil rod reinforcing bar of prestressed concrete steel stick, the advantage such as there is few, the easy processing of oxide skin, mould loss is low, hardening capacity is high, microstructure is even, the prestressed concrete steel stick that this product is produced has intensity easy-regulating, without delayed fracture, without cold-upsetting cracks, recovery rate of iron advantages of higher, realized the economic production of prestressed concrete steel stick and promoted the use of.Adopt this explained hereafter for making the light coil rod reinforcing bar of prestressed concrete steel stick, its tensile strength (Rm): 630～660MPa, relative reduction in area >=65%, 10.0～11.5 grades of ferrite grain sizes.
Claims (9)
1. one kind for making the light coil rod reinforcing bar of prestressed concrete steel stick, it is characterized in that: described steel billet composition is C:0.25～0.30wt% by weight percentage, Si:0.90～1.10 wt%, Mn:0.50～0.70 wt%, Nb:0.015～0.030 wt%, B:0.0020～0.0040 wt%, S≤0.020 wt%, P≤0.020wt%, all the other are Fe and inevitable impurity; Described steel billet makes by heating, controlled rolling and controlled cooling operation the light coil rod reinforcing bar that nominal diameter is 8.0～14.0mm.
2. according to claim 1 for making the light coil rod reinforcing bar of prestressed concrete steel stick, it is characterized in that: described light coil rod reinforcing bar has following characteristic: tensile strength (Rm): 630～660MPa, relative reduction in area >=65%, 10.0～11.5 grades of ferrite grain sizes.
Described in a claim 1 or 2 for making the working method of light coil rod reinforcing bar of prestressed concrete steel stick, comprise smelting molten steel and deoxidation alloying, the refining of molten steel LF stove, molten steel casting, heating steel billet, controlled rolling and controlled cooling operation, it is characterized in that: specifically comprise following process:
A, smelting molten steel and deoxidation alloying: by molten iron (chemical composition C 4.0-5.5wt%, Si 0.30-0.80wt%, Mn 0.25-0.70wt%, P 0.110-0.170wt%, S≤0.015wt%, all the other are Fe and inevitable impurity), steel scrap (chemical composition C 0.20-0.35wt%, Si 0.25-0.55 wt%, Mn 0.30-1.00 wt%, P 0.030-0.055wt%, S 0.020-0.040wt%, all the other are Fe and inevitable impurity) and the pig iron (chemical composition C 3.2-4.0 wt%, Si 0.40-0.70 wt%, Mn 0.25-0.60 wt%, P 0.070-0.110wt%, S 0.010-0.020wt%, all the other are Fe and inevitable impurity) add in LD converter, carry out conventional top bottom blowing, amount adds lime routinely, rhombspar, the slag making of magnesite ball, controlling endpoint carbon content is 0.06～0.10 wt%, tapping temperature is 1655～1675 ℃, tapping forward direction ladle bottom adds lime to carry out wash heat, lime adding amount is: 4.0kg/t steel, tapping process adopts omnidistance bottom argon blowing technology, argon flow amount control is 15～30NL/min, in the time that the molten steel amount in ladle is greater than 1/4, in ladle, add following material successively: by the amount of 6.1～9.0kg/t steel, add the high carbon ferromanganese of following mass ratio: Mn 75.6wt%, C 16.7wt%, all the other are Fe and inevitable impurity, by the amount of 14.5～17.5kg/t steel, add the ferro-silicon of following mass ratio: Si 73.5wt%, all the other are Fe and inevitable impurity, by the amount of 0.25～0.50 kg/t steel, add the ferro-niobium of following mass ratio: Nb 64.5wt%, all the other are Fe and inevitable impurity, by the amount of 1.5～1.9kg/t steel, add the carburelant of following mass ratio: C 92.53wt%, S 0.085wt%, ash 4.15wt%, fugitive constituent 1.64wt%, moisture content 0.75wt%, all the other are inevitable impurity, reach at 3/4 o'clock in ladle molten steel amount and add above-mentioned alloy and carburelant, after tapping, molten steel is hung and delivers to LF stove refining station,
B, the refining of molten steel LF stove: molten steel is winched to LF stove refining station and connect argon gas band, open argon gas and adopt little argon amount (15～25NL/min) Argon 2 minutes, then lower electrode adopts 7～9 grades of gears to change slag; Switch on after 3 minutes, lift electrode and observe stove internalization slag situation, thermometric, sampling afterwards; If slag condition is rarer, add lime 2.0～4.0kg/t steel, then add calcium carbide 0.5 kg/t steel residue adjustment, controlling basicity of slag is 5.0～7.0; Press the amount of 0.3kg/t steel, add the ferro-boron of following mass ratio: B 16.5wt%, all the other are Fe and inevitable impurity; After afterwards liquid steel temperature being heated to 1580～1595 ℃, carry out wire feeding process, feeding has the silicon-calcium wire of following mass 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 150m; It is that the little argon gas amount of 20～30NL/min is carried out soft blow argon to molten steel that line feeding finishes to adopt flow, and the soft blow time is 10 minutes, adds afterwards molten steel covering agent, and add-on control is 1.0 kg/t steel, then molten steel is winched to casting station;
C, molten steel casting: be 1520～1535 ℃ at tundish temperature, pulling rate is 1.8～2.0m/min, two cold specific waters are 1.4～1.6L/kg, M-EMS Current intensity is under 250A, the running frequency condition that is 2.5HZ, adopts little square billet casting machine the continuous casting of molten steel of B step to be become to the steel billet of section 150mm × 150mm;
D, heating steel billet: it is in the process furnace of 1100～1150 ℃ that steel billet is sent into soaking zone furnace temperature, heat 60～80 minutes, steel billet tapping temperature is 980～1020 ℃, go out squama by high pressure water, the 5 base positions that push to before inlet of rolling mill treat that warm area carries out the naturally cooling of 3～5 minutes, finally enter mill milling with the start rolling temperature of 910～930 ℃;
E, controlled rolling and controlled cooling: the steel billet after heating is sent into high-speed rod-rolling mill and be rolled, entering final rolling temperature control is 820～840 ℃, and laying temperature control is 825～835 ℃; After weaving silk, enter stelmo line air-cooled line and carry out " standard+delay " type control cooling (fast cooling+Slow cooling); When rolling, cooling blower is opened first 1～3, opens corresponding blower fan top insulation cover, air quantity 100%, good clever 3 grades simultaneously; All the other blower fan Close Alls are closed corresponding blower fan top insulation cover simultaneously, and the control of first and last section roller table speed is 0.30～0.40m/s; After the air-cooled end of stelmor, collecting the control of volume temperature is 450～550 ℃, then will coil natural air cooling to room temperature, obtains a kind of for making the light coil rod reinforcing bar of prestressed concrete steel stick.
4. as claimed in claim 3 for making the working method of light coil rod reinforcing bar of prestressed concrete steel stick, it is characterized in that: described little square billet casting machine is R9m, and 5 machines 5 flow.
5. as claimed in claim 3 for making the working method of light coil rod reinforcing bar of prestressed concrete steel stick, it is characterized in that: described heating steel billet completes by side inlet side outlet walking beam double heat storage type process furnace.
6. as claimed in claim 3 for making the working method of light coil rod reinforcing bar of prestressed concrete steel stick, it is characterized in that: the length of described de-scaling high-pressure water tank is 1.1 ~ 1.5m.
7. as claimed in claim 3 for making the working method of light coil rod reinforcing bar of prestressed concrete steel stick, it is characterized in that: described stelmo line air-cooled line total length 93m, along rolling direction 12 Fans of evenly arranging.
8. as claimed in claim 3 for making the working method of light coil rod reinforcing bar of prestressed concrete steel stick, it is characterized in that: the described control of reinforcing bar temperature, blower fan and insulation cover opened number, roller table speed and required specifically to determine depending on different size.
9. as claimed in claim 3 for making the working method of light coil rod reinforcing bar of prestressed concrete steel stick, it is characterized in that: described high-speed rod-rolling mill arranges 28 frames.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410082260.8A CN103805847B (en) | 2014-03-07 | 2014-03-07 | For making light coil rod reinforcing bar and the working method of prestressed concrete steel stick |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410082260.8A CN103805847B (en) | 2014-03-07 | 2014-03-07 | For making light coil rod reinforcing bar and the working method of prestressed concrete steel stick |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103805847A true CN103805847A (en) | 2014-05-21 |
| CN103805847B CN103805847B (en) | 2016-01-20 |
Family
ID=50703224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410082260.8A Active CN103805847B (en) | 2014-03-07 | 2014-03-07 | For making light coil rod reinforcing bar and the working method of prestressed concrete steel stick |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103805847B (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103981448A (en) * | 2014-05-30 | 2014-08-13 | 武钢集团昆明钢铁股份有限公司 | Ultra-fine grained HPB300 hot-rolling optical disc stripe reinforcing steel bar and preparation method thereof |
| CN104561490A (en) * | 2015-01-23 | 2015-04-29 | 武钢集团昆明钢铁股份有限公司 | Control cooling after rolling method for highline small specification hot rolled ribbed anti-seismic reinforcing steel bar coil |
| CN104745790A (en) * | 2015-04-10 | 2015-07-01 | 武钢集团昆明钢铁股份有限公司 | Method for softening and rolling cold forging steel |
| CN105970082A (en) * | 2016-05-31 | 2016-09-28 | 内蒙古包钢钢联股份有限公司 | Production method of steel wire rod used for high-strength prestressed concrete steel bars |
| CN106319179A (en) * | 2016-08-31 | 2017-01-11 | 云南德胜钢铁有限公司 | Production technology for HRB400 coiled fine-grain reinforcing steel bar |
| CN107185969A (en) * | 2017-05-27 | 2017-09-22 | 内蒙古包钢钢联股份有限公司 | Medium carbon cold heading steel wire rod scale on surface component and method for controlling thickness |
| CN107321787A (en) * | 2017-05-26 | 2017-11-07 | 内蒙古包钢钢联股份有限公司 | Low-alloy the cold heading steel atmospheric corrosion resistance surface iron scale control method |
| CN108300938A (en) * | 2018-01-19 | 2018-07-20 | 天津荣程联合钢铁集团有限公司 | A kind of rolled wire steel and its processing method |
| CN110257705A (en) * | 2019-07-02 | 2019-09-20 | 常熟市龙腾特种钢有限公司 | A kind of prestressed concrete steel stick steel being not easy brittle failure and its production method |
| CN111020393A (en) * | 2020-01-11 | 2020-04-17 | 武钢集团昆明钢铁股份有限公司 | Preparation method of nitrogen-rich vanadium microalloyed large-sized anti-seismic reinforcing steel bar |
| CN111378901A (en) * | 2020-05-15 | 2020-07-07 | 武钢集团昆明钢铁股份有限公司 | Special base metal wire rod for 1420 MPa-level PC steel rod and preparation method thereof |
| CN111455262A (en) * | 2020-01-11 | 2020-07-28 | 武钢集团昆明钢铁股份有限公司 | Ultrafine-grain high-toughness 600 MPa-level anti-seismic reinforcing steel bar and preparation method thereof |
| CN113265578A (en) * | 2021-04-29 | 2021-08-17 | 武钢集团昆明钢铁股份有限公司 | Integrated control method for reducing steel hysteresis fracture for prestressed reinforced concrete and application thereof |
| CN114082906A (en) * | 2021-11-17 | 2022-02-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of steel bar and steel bar |
| CN115125438A (en) * | 2022-06-13 | 2022-09-30 | 盐城市联鑫钢铁有限公司 | Hot-rolled wire rod for PC steel bar and processing technology thereof |
| CN115418551A (en) * | 2022-11-01 | 2022-12-02 | 江苏永钢集团有限公司 | F690-grade steel plate matched welding wire steel wire rod and production method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101205587A (en) * | 2007-12-10 | 2008-06-25 | 华北石油管理局第一机械厂 | Method for manufacturing high-strength X80 steel spiral welded pipe |
| CN101613841A (en) * | 2009-07-16 | 2009-12-30 | 首钢总公司 | Revolving furnace continuous casting little square billet ultra-high strength and toughness tunnel supporting anchor rod steel and production method |
| CN102796950A (en) * | 2012-08-08 | 2012-11-28 | 内蒙古包钢钢联股份有限公司 | Production method of large-scale high strength 82B high-carbon hard wire rod |
| WO2013046693A1 (en) * | 2011-09-29 | 2013-04-04 | Ｊｆｅスチール株式会社 | Hot-rolled steel sheet and method for producing same |
-
2014
- 2014-03-07 CN CN201410082260.8A patent/CN103805847B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101205587A (en) * | 2007-12-10 | 2008-06-25 | 华北石油管理局第一机械厂 | Method for manufacturing high-strength X80 steel spiral welded pipe |
| CN101613841A (en) * | 2009-07-16 | 2009-12-30 | 首钢总公司 | Revolving furnace continuous casting little square billet ultra-high strength and toughness tunnel supporting anchor rod steel and production method |
| WO2013046693A1 (en) * | 2011-09-29 | 2013-04-04 | Ｊｆｅスチール株式会社 | Hot-rolled steel sheet and method for producing same |
| CN102796950A (en) * | 2012-08-08 | 2012-11-28 | 内蒙古包钢钢联股份有限公司 | Production method of large-scale high strength 82B high-carbon hard wire rod |
Cited By (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103981448B (en) * | 2014-05-30 | 2016-05-25 | 武钢集团昆明钢铁股份有限公司 | A kind of Ultra-fine Grained HPB300 hot calendering coil rod reinforcing bar and preparation method thereof |
| CN103981448A (en) * | 2014-05-30 | 2014-08-13 | 武钢集团昆明钢铁股份有限公司 | Ultra-fine grained HPB300 hot-rolling optical disc stripe reinforcing steel bar and preparation method thereof |
| CN104561490A (en) * | 2015-01-23 | 2015-04-29 | 武钢集团昆明钢铁股份有限公司 | Control cooling after rolling method for highline small specification hot rolled ribbed anti-seismic reinforcing steel bar coil |
| CN104561490B (en) * | 2015-01-23 | 2016-08-31 | 武钢集团昆明钢铁股份有限公司 | A kind of high hot-rolled ribbed anti-seismic steel bar of line small dimension coils cooling control after rolling method |
| CN104745790B (en) * | 2015-04-10 | 2017-01-25 | 武钢集团昆明钢铁股份有限公司 | Method for softening and rolling cold forging steel |
| CN104745790A (en) * | 2015-04-10 | 2015-07-01 | 武钢集团昆明钢铁股份有限公司 | Method for softening and rolling cold forging steel |
| CN105970082A (en) * | 2016-05-31 | 2016-09-28 | 内蒙古包钢钢联股份有限公司 | Production method of steel wire rod used for high-strength prestressed concrete steel bars |
| CN106319179A (en) * | 2016-08-31 | 2017-01-11 | 云南德胜钢铁有限公司 | Production technology for HRB400 coiled fine-grain reinforcing steel bar |
| CN107321787A (en) * | 2017-05-26 | 2017-11-07 | 内蒙古包钢钢联股份有限公司 | Low-alloy the cold heading steel atmospheric corrosion resistance surface iron scale control method |
| CN107321787B (en) * | 2017-05-26 | 2019-05-24 | 内蒙古包钢钢联股份有限公司 | Low-alloy the cold heading steel atmospheric corrosion resistance surface iron scale control method |
| CN107185969A (en) * | 2017-05-27 | 2017-09-22 | 内蒙古包钢钢联股份有限公司 | Medium carbon cold heading steel wire rod scale on surface component and method for controlling thickness |
| CN107185969B (en) * | 2017-05-27 | 2019-10-29 | 内蒙古包钢钢联股份有限公司 | Medium carbon cold heading steel wire rod scale on surface component and method for controlling thickness |
| CN108300938A (en) * | 2018-01-19 | 2018-07-20 | 天津荣程联合钢铁集团有限公司 | A kind of rolled wire steel and its processing method |
| CN110257705A (en) * | 2019-07-02 | 2019-09-20 | 常熟市龙腾特种钢有限公司 | A kind of prestressed concrete steel stick steel being not easy brittle failure and its production method |
| CN110257705B (en) * | 2019-07-02 | 2021-07-02 | 常熟市龙腾特种钢有限公司 | Steel for prestressed concrete steel bar not easy to brittle fracture and production method thereof |
| WO2021000729A1 (en) * | 2019-07-02 | 2021-01-07 | 常熟市龙腾特种钢有限公司 | Non-brittle steel for prestressed concrete steel bar, and production method therefor |
| CN111455262A (en) * | 2020-01-11 | 2020-07-28 | 武钢集团昆明钢铁股份有限公司 | Ultrafine-grain high-toughness 600 MPa-level anti-seismic reinforcing steel bar and preparation method thereof |
| CN111020393B (en) * | 2020-01-11 | 2021-05-18 | 武钢集团昆明钢铁股份有限公司 | Preparation method of nitrogen-rich vanadium microalloyed HRB600 ultrafine grain anti-seismic steel bar |
| CN111455262B (en) * | 2020-01-11 | 2021-06-01 | 武钢集团昆明钢铁股份有限公司 | Ultrafine-grain high-toughness 600 MPa-level anti-seismic reinforcing steel bar and preparation method thereof |
| CN111020393A (en) * | 2020-01-11 | 2020-04-17 | 武钢集团昆明钢铁股份有限公司 | Preparation method of nitrogen-rich vanadium microalloyed large-sized anti-seismic reinforcing steel bar |
| CN111378901A (en) * | 2020-05-15 | 2020-07-07 | 武钢集团昆明钢铁股份有限公司 | Special base metal wire rod for 1420 MPa-level PC steel rod and preparation method thereof |
| CN113265578A (en) * | 2021-04-29 | 2021-08-17 | 武钢集团昆明钢铁股份有限公司 | Integrated control method for reducing steel hysteresis fracture for prestressed reinforced concrete and application thereof |
| CN113265578B (en) * | 2021-04-29 | 2022-05-10 | 武钢集团昆明钢铁股份有限公司 | Integrated control method for reducing delayed fracture of steel for prestressed reinforced concrete and application thereof |
| CN114082906A (en) * | 2021-11-17 | 2022-02-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of steel bar and steel bar |
| CN115125438A (en) * | 2022-06-13 | 2022-09-30 | 盐城市联鑫钢铁有限公司 | Hot-rolled wire rod for PC steel bar and processing technology thereof |
| CN115418551A (en) * | 2022-11-01 | 2022-12-02 | 江苏永钢集团有限公司 | F690-grade steel plate matched welding wire steel wire rod and production method thereof |
| CN115418551B (en) * | 2022-11-01 | 2023-02-03 | 江苏永钢集团有限公司 | F690-grade steel plate matched welding wire steel wire rod and production method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103805847B (en) | 2016-01-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103805847B (en) | For making light coil rod reinforcing bar and the working method of prestressed concrete steel stick | |
| CN104372247B (en) | A kind of 600MPa level high-strength quake-proof Screwbar muscle and preparation method thereof | |
| CN106929623B (en) | A kind of preparation method of 10.9 grade high-strength bolt steel hot rolling wire rod | |
| CN107312970B (en) | A kind of high-strength steel for fastener of super large and production method | |
| CN100467652C (en) | Easy-weld hardening high-strength steel plate and production method thereof | |
| CN104294162B (en) | A kind of 785MPa grade high-strength prestressed structure spiral and preparation method thereof | |
| CN104911502B (en) | 1080MPa grade high strength prestressed finish rolled threaded reinforcing bar and preparation method thereof | |
| CN103451398B (en) | Manufacture method of 50CrVA alloy structural steel type hot rolled round steel bar | |
| CN103981448B (en) | A kind of Ultra-fine Grained HPB300 hot calendering coil rod reinforcing bar and preparation method thereof | |
| CN103361569A (en) | Ultralow temperature weather-proof structural steel plate and production method thereof | |
| CN102876970B (en) | Steel with yield strength larger than or equal to 390 MPa for high-rise buildings and production method of steel | |
| CN114000050B (en) | Nitrogen-rich vanadium-chromium microalloyed ultra-fine grain corrosion-resistant HRB400E wire rod anti-seismic steel bar and preparation method thereof | |
| CN102181794B (en) | Hardening and tempering high-strength steel plate for wood based panel equipment and production method of tempering high-strength steel plate | |
| CN105018839A (en) | 420 MPa grade high-performance anti-shock H-type steel and preparation method thereof | |
| CN109554613A (en) | A kind of production method of HRB500E high-strength anti-seismic steel bar | |
| CN104328338A (en) | Small-scale finish-rolled twisted steel and production method thereof | |
| CN101717899A (en) | HRB500E V-N high-strength anti-seismic steel bar and production method thereof | |
| CN102796961A (en) | 600MPa high-performance fire-resistant aseismic reinforcing steel bar for concrete and production thereof | |
| CN114000049B (en) | Nitrogen-rich vanadium-niobium microalloyed large-size HRB400E straight-bar anti-seismic steel bar and preparation method thereof | |
| CN108728757A (en) | A kind of low temperature L450M pipe line steels and its manufacturing method | |
| CN107604248A (en) | A kind of high intensity Q500GJD quenched and tempered states steel plate for building structure and its manufacture method | |
| CN104372249B (en) | A kind of 960MPa grade high-strength spiral and preparation method thereof for prestressed structure | |
| CN110106443A (en) | A kind of superhigh intensity bolt round-bar pass method | |
| CN110106442A (en) | A kind of ultra-fine acicular structure structural steel and its production method | |
| CN113215499A (en) | Ultra-thick anti-seismic fire-resistant steel plate with 390 MPa-grade yield strength and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |