CN110923576A - 635 MPa-grade high-strength disc screw for long-span beam engineering and controlled rolling and controlled cooling process thereof - Google Patents
635 MPa-grade high-strength disc screw for long-span beam engineering and controlled rolling and controlled cooling process thereof Download PDFInfo
- Publication number
- CN110923576A CN110923576A CN201911347168.9A CN201911347168A CN110923576A CN 110923576 A CN110923576 A CN 110923576A CN 201911347168 A CN201911347168 A CN 201911347168A CN 110923576 A CN110923576 A CN 110923576A
- Authority
- CN
- China
- Prior art keywords
- strength
- equal
- rolling
- controlled
- span beam
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention aims to provide a 635 MPa-grade high-strength disc screw for a long-span beam engineering and a rolling and cooling control process thereof, wherein the disc screw comprises the following chemical components in percentage by mass: 0.25-0.28% of C, 0.60-0.75% of Si, 1.45-1.55% of Mn, 0.120-0.135% of V, 0.020-0.030% of Nb, less than or equal to 0.030% of P, less than or equal to 0.030% of S, 0.0110-0.0125% of N, less than or equal to 0.58% of Ceq, and the balance of Fe and inevitable impurities; the high-strength coiled screw produced by the method has the advantages that the actual measurement yield strength, the tensile strength and the elongation after breakage all meet the use requirements, and the high strength and the plasticity are well matched.
Description
Technical Field
The invention belongs to the technical field of spiral shell steel for constructional engineering, and particularly relates to a 635 MPa-grade high-strength spiral shell for long-span beam engineering and a rolling and cooling control process thereof.
Background
The high-strength twisted steel with the strength of more than 600Mpa has the characteristics of high strength and excellent comprehensive performance, according to the scale of the current engineering construction in China, if the application proportion of the high-strength twisted steel is increased from 35 percent to 65 percent at present, about 1000 million tons of the twisted steel can be saved each year, the consumption of 1600 million tons of iron ore, 600 million tons of standard coal and 4100 million tons of new water is correspondingly reduced, and meanwhile, the emission of 2000 million tons of carbon dioxide, 2000 million tons of sewage and 1500 million grams of dust is reduced. As a material-saving, energy-saving and environment-friendly product, the high-strength twisted steel is widely popularized and applied in concrete structure and masonry structure engineering, is an effective way for accelerating the change of economic development modes, is an important measure for building a resource-saving and environment-friendly society, and has great significance for promoting the structure adjustment and the transformation upgrade of the steel industry and the construction industry.
In 2018, the standard of the hot-rolled ribbed steel bar is revised by the country, and the HRB600 mark is added. However, the strength stability, elongation and other indexes of the steel bar above 600Mpa level are not easy to meet the requirements, so that the problems of high cost, complex process, high energy consumption and the like are caused, the actual production of 600Mpa level hot-rolled high-strength coil bolts by domestic steel mills is not enough, and the steel mills producing 635Mpa level hot-rolled high-strength coil bolts with higher strength are more rarely reported.
Disclosure of Invention
The invention aims to provide a 635 MPa-level high-strength disc screw for long-span beam engineering and a rolling and cooling control process thereof.
The technical scheme adopted by the invention is as follows:
a635 MPa-grade high-strength disc spiral for long-span beam engineering comprises the following chemical components in percentage by mass: 0.25-0.28% of C, 0.60-0.75% of Si, 1.45-1.55% of Mn, 0.120-0.135% of V, 0.020-0.030% of Nb, less than or equal to 0.030% of P, less than or equal to 0.030% of S, 0.0110-0.0125% of N, less than or equal to 0.58% of Ceq, and the balance of Fe and inevitable impurities.
Wherein Ceq is C + Mn/6+ (Cr + V + Mo)/5+ (Cu + Ni)/15.
Further, the chemical components in the following mass percentage are preferably included: 0.26-0.27% of C, 0.70-0.71% of Si, 1.52-1.55% of Mn, 0.125-0.129% of V, 0.021-0.026% of Nb, less than or equal to 0.030% of P, less than or equal to 0.017% of S, 0.0115-0.0117% of N, 0.55-0.56% of Ceq, and the balance of Fe and inevitable impurities.
The components, the action and the mechanism of each element in the 635 MPa-grade high-strength disc snail are as follows:
c can play a role in solid solution strengthening, and can increase the pearlite content and the strength of steel, but the welding performance is influenced and the plasticity is reduced when the content is too high. In the invention, the mass fraction of the element C is 0.25-0.28%, preferably 0.26-0.27%.
Si plays a role in solid solution strengthening, can improve the strength of the steel, does not participate in the calculation of carbon equivalent (Ceq), has small influence on welding performance, but reduces the toughness and plasticity of the steel when the content is too high. In the invention, the mass fraction of the Si element is 0.60-0.75%, preferably 0.70-0.71%.
Mn also plays a role in solid solution strengthening, so that the strength of the steel is obviously improved, the hardenability of the steel is improved, the pearlite content is increased, and the yield ratio is improved, but the welding performance is influenced by the excessively high content. In the invention, the mass fraction of the Si element is 1.45-1.55%, preferably 1.52-1.55%.
V is a main strengthening element, formed VC, VN and V (C, N) compounds have strong pinning effect on grain boundaries and dislocation, and can refine crystal grains, obviously improve the strength, increase the plasticity and improve the toughness. In the invention, the mass fraction of the element V is 0.12-0.15%, preferably 0.125-0.129%.
The (C, N) compound precipitation temperature of the Nb element is more than 1200 ℃, so that the (C, N) compound precipitation temperature has a barrier effect on the movement of austenite grain boundaries, the recrystallization temperature is increased, a fine grain strengthening effect is achieved, the grain boundary area of the austenite unit volume is increased, the pearlite nucleation rate and the pearlite content are increased, and the yield ratio is increased. In the invention, the mass fraction of the Nb element is 0.020-0.030%, preferably 0.021-0.026%.
P, S element is a harmful element, which impairs the plasticity of steel, and too low a content greatly increases the cost.
The 635 MPa-grade high-strength disc spiral for the large span beam engineering has a metallographic structure of ferrite and pearlite, and has a grain size grade of 9.0-10.5; the yield strength is more than or equal to 630MPa, the tensile strength is more than or equal to 820MPa, the elongation after fracture is more than or equal to 15 percent, and the total elongation under maximum force is more than or equal to 9 percent.
The invention provides a controlled rolling and cooling process of a 635 MPa-grade high-strength disc screw for a long span beam project, which comprises the following steps of: heating and rolling the casting blank, cooling the rolled wire rod with water, feeding the wire rod into a pinch roll, spinning and coiling the wire rod by a spinning machine, and sequentially performing air cooling and slow cooling of a heat preservation cover on a spinning coil entering a Strachol air cooling line.
Furthermore, the heating time of the casting blank in the heating furnace is more than or equal to 100min, the tapping temperature is more than or equal to 1010 ℃, so as to ensure that the alloy elements are fully diffused, but the austenite grains of the casting blank are coarse due to overhigh heating temperature or overlong furnace time, and the performance of the finished product is influenced, the heating time is controlled to be 100-loop for 150min, the initial rolling temperature is 1010-1030 ℃, and the finish rolling temperature is 860-loop 890 ℃.
The spinning temperature is controlled at 880-950 ℃ according to different requirements.
The front six air-cooled lines are 20 ten thousand meters3The invention relates to a variable-frequency fan with air quantity, which is characterized in that 1-4# fans are used for air cooling at a cooling speed of more than or equal to 2 ℃/s according to different specifications, and the target temperature is rapidly cooled to a pearlite transformation temperature range of 650-700 ℃.
18 groups of heat preservation covers of the air cooling line, wherein each group is 4.6 meters long, and 6-16# heat preservation covers are closed for slow cooling of the heat preservation covers. The slow cooling rate is less than or equal to 2 ℃/s, and the aim is to release the internal stress after quick cooling and ensure the performance stability and authenticity of the hot rolled steel.
According to the invention, based on the designed components of the casting blank, the tapping temperature of the blank is controlled to be 1010-1030 ℃, through water cooling is adopted after rolling, the spinning temperature of the last Steyr finish line is 890-950 ℃, ferrite and pearlite structures are formed, and grains are refined through high-speed continuous rolling, the grain size level is 9.0-10.5, so that the strength is ensured and the plasticity is improved. The actual measurement yield strength (Rm/Rel) and the elongation after tensile strength fracture of the high-strength spiral shell for the long-span beam engineering meet the use requirements. The method has simple process, and has the characteristics of good high strength and plastic matching, resource saving and profit improvement compared with hot rolling of 400 Mpa-grade steel bars.
Drawings
FIG. 1 is a 200X metallographic structure diagram of a 635MPa grade high-strength disk core part in example 1;
FIG. 2 is a 500 Xmetallographic structure diagram of a 635MPa grade high-strength disk core part in example 2;
FIG. 3 is a 100 Xmetallographic structure diagram of a 635MPa grade high-strength disk core portion in example 3.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1(10mm gauge):
the embodiment provides a 635Mpa high-strength spiral, which comprises the following element components of, by mass, 0.26% of C, 0.71% of Si, 1.53% of Mn, 0.125% of V, 0.021% of Nb0.016% of P, 0.010% of S, 0.0115% of N, 0.54% of Ceq0.54% of S, and the balance of Fe and inevitable impurities.
180 x 180mm continuous casting square billets are produced by steelmaking according to the control components and are sent to a steel rolling high-speed wire for continuous rolling to produce the wire coil screws with the specification of 10 mm. The steel rolling control process comprises the following steps: heating the blank in a heating furnace for 100-150min, wherein the tapping temperature is not less than 1010 ℃, and the rolling temperature after heating is 1010-1030 ℃; 860-890 ℃, finish rolling temperature, water penetration after rolling, and actual control of spinning temperature at 880-910 ℃; after the spinning coil enters a 112m Stolmol air cooling line, the number 1-4#20 ten thousand m3The machine is respectively provided with 50% of air cooling, the air cooling is carried out at a cooling speed of more than or equal to 2 ℃/s, the air cooling is carried out to the temperature of 650 plus pearlite transformation temperature of 700 ℃, then the heat preservation cover No. 6-16 is closed for slow cooling, the slow cooling rate is less than or equal to 2 ℃/s, finally the phase transformation is carried out to form a uniform ferrite plus pearlite structure, the grain size grade is 9.0-10.5 grade, the metallographic structure diagram of the core part of the high-strength coiled spiral of 635MPa is shown in figure 1, and the uniform core part structure of the high-strength coiled spiral of 635MPa can.
The 635 Mpa-grade high-strength disc spiral provided by the embodiment has the following performance indexes: the yield strength Rel697-705MPa, the tensile strength 840-870MPa and the elongation after fracture 23.5-24 percent.
Example 2(8mm gauge):
the embodiment provides a 635Mpa high-strength coiled spiral, which comprises the following element components of, by mass, 0.27% of C, 0.70% of Si, 1.55% of Mn, 0.129% of V, 0.023% of Nb0.015% of P, 0.013% of S, 0.0117% of N, 0.55% of Ceq0.55% of S, and the balance of Fe and inevitable impurities.
180 x 180mm continuous casting square billets are produced by steelmaking according to the control components and are sent to a steel rolling high-speed wire for continuous rolling to produce the coiled snails with the specification of 8 mm. The steel rolling control process comprises the following steps: heating the blank in a heating furnace for 100-150min, wherein the tapping temperature is not less than 1010 ℃, and the rolling temperature after heating is 1010-1030 ℃; 860 ℃ and 890 ℃, water is passed after rolling, and the spinning temperature is actually controlled 910 ℃ and 940 ℃; after the spinning coil enters a 112m Stolmol air cooling line, the number 1 to 3#20 ten thousand m3The machine is respectively provided with 50% of air cooling, the air cooling is carried out at a cooling speed of more than or equal to 2 ℃/s, the air cooling is carried out to the temperature of 650 plus pearlite transformation temperature of 700 ℃, then the heat preservation cover No. 6-16 is closed for slow cooling, the slow cooling rate is less than or equal to 2 ℃/s, finally the phase transformation is carried out to form a uniform ferrite plus pearlite structure, the grain size grade is 9.0-10.5 grade, the metallographic structure diagram of the core part of the high-strength coiled spiral of 635MPa is shown in figure 2, and the uniform core part structure of the high-strength coiled spiral of 635MPa can.
The 635 Mpa-grade high-strength disc spiral provided by the embodiment has the following performance indexes: the yield strength Rel640-729MPa, the tensile strength 850-937MPa and the elongation after fracture 23-24.5 percent.
Example 3(6mm gauge):
the embodiment provides a 635Mpa high-strength spiral, which comprises the following element components of, by mass, 0.26% of C, 0.70% of Si, 1.52% of Mn, 0.127% of V, 0.026% of Nb0.026% of P, 0.016% or less of S, 0.017% or less of N, 0.0117% of Ceq0.54% of S, and the balance of Fe and inevitable impurities.
180 x 180mm continuous casting square billets are produced by steelmaking according to the control components and are sent to a steel rolling high-speed wire for continuous rolling to produce coiled snails with the specification of 6 mm. The steel rolling control process comprises the following steps: heating the blank in a heating furnace for 100-150min, wherein the tapping temperature is not less than 1010 ℃, and the rolling temperature after heating is 1010-1030 ℃; 860 ℃ and 890 ℃ finish rolling temperatureAfter rolling, water is pumped, and the spinning temperature is actually controlled at 920-950 ℃; after the spinning coil enters a 112m Stolmol air cooling line, the number 1-2#20 ten thousand m3The machine is respectively provided with 50% of air cooling, the air cooling is carried out at a cooling speed of more than or equal to 2 ℃/s, the air cooling is carried out to the pearlite transformation temperature of 650 + 700 ℃, the heat preservation cover 4-16# is closed for slow cooling, the uniform ferrite + pearlite structure is finally formed by phase transformation, the slow cooling rate is less than or equal to 2 ℃/s, the grain size grade is 9.0-10.5 grade, the metallographic structure diagram of the core part of the 635Mpa high-strength disc spiral is shown in figure 3, and the uniform structure of the core part of the 635Mpa high-strength disc spiral can be seen from the figure.
The 635 Mpa-grade high-strength disc spiral provided by the embodiment has the following performance indexes: the yield strength Rel647-700MPa, the tensile strength 846-923MPa and the elongation after fracture 23-24 percent.
Comparative example 1
A10 mm specification spiral shell, other the same as example 1, except that the steel rolling control each process technology is: the initial rolling temperature of the heated blank is 1010-1030 ℃; 880 plus 910 ℃ of finish rolling temperature, water is penetrated after rolling, and the spinning temperature is actually controlled at 890 plus 920 ℃; after the spinning coil enters a 112m Stolmol air cooling line, the number 1-4#20 ten thousand m3And (3) respectively opening 100% of air cooling by the branch machines, then closing the heat preservation cover for slow cooling, and finally performing phase change to form a ferrite and pearlite structure.
The performance indexes of the spiral shell provided by the comparative example are as follows: yield strength Rel598-712MPa, tensile strength 810-1020MPa, and elongation after fracture 22-24%.
Comparative example 2
A10 mm specification spiral shell, other the same as example 1, except that the steel rolling control each process technology is: the initial rolling temperature of the heated blank is 1010-1030 ℃; 880 plus 910 ℃ of finish rolling temperature, water is penetrated after rolling, and the spinning temperature is actually controlled at 890 plus 920 ℃; after the spinning coil enters a 112m Stolmol air cooling line, the number 1-4#20 ten thousand m3The machine is respectively provided with 100% air cooling, then the 6-16# heat preservation cover is closed for slow cooling, and finally phase transformation is carried out to form a ferrite + pearlite structure.
The performance indexes of the spiral shell provided by the comparative example are as follows: yield strength Rel625-690MPa, tensile strength 846-985MPa, and elongation after fracture 22.5-24%
The above detailed description of the 635MPa grade high strength disc screw for long span beam engineering and the controlled rolling and cooling process thereof with reference to the embodiments is illustrative and not restrictive, and several embodiments can be cited according to the limited scope, so that changes and modifications without departing from the general concept of the present invention shall fall within the protection scope of the present invention.
Claims (9)
1. A635 MPa-grade high-strength disc spiral for long-span beam engineering is characterized by comprising the following chemical components in percentage by mass: 0.25-0.28% of C, 0.60-0.75% of Si, 1.45-1.55% of Mn, 0.120-0.135% of V, 0.020-0.030% of Nb, less than or equal to 0.030% of P, less than or equal to 0.030% of S, 0.0110-0.0125% of N, less than or equal to 0.58% of Ceq, and the balance of Fe and inevitable impurities.
2. The 635 MPa-grade high-strength disc spiral for the long-span beam engineering according to claim 1, which comprises the following chemical components in percentage by mass: 0.26-0.27% of C, 0.70-0.71% of Si, 1.52-1.55% of Mn, 0.125-0.129% of V, 0.021-0.026% of Nb, less than or equal to 0.030% of P, less than or equal to 0.017% of S, 0.0115-0.0117% of N, 0.55-0.56% of Ceq, and the balance of Fe and inevitable impurities.
3. The 635 MPa-grade high-strength disc spiral for the large-span beam engineering according to claim 1 or 2, wherein the metallographic structure of the 635 MPa-grade high-strength disc spiral for the large-span beam engineering is a ferrite + pearlite structure, and the grain size grade is 9.0-10.5; the yield strength is more than or equal to 630MPa, the tensile strength is more than or equal to 820MPa, the elongation after fracture is more than or equal to 15 percent, and the total elongation under maximum force is more than or equal to 9 percent.
4. A rolling and cooling control process of a 635MPa grade high-strength disc screw for a long span beam project according to any one of claims 1 to 3, characterized by comprising the following steps: heating and rolling the casting blank, cooling the rolled wire rod with water, feeding the wire rod into a pinch roll, spinning and coiling the wire rod by a spinning machine, and sequentially performing air cooling and slow cooling of a heat preservation cover on a spinning coil entering a Strachol air cooling line.
5. The controlled rolling and controlled cooling process of the 635 MPa-level high-strength disc spiral for the long span beam engineering as claimed in claim 4, wherein the tapping temperature of the casting blank after heating is 1010-1030 ℃, and the heating time of the casting blank in the heating furnace is 100-150 min.
6. The controlled rolling and controlled cooling process of the 635MPa grade high-strength disc screw for the long span beam engineering as claimed in claim 4, wherein the rolling start temperature is 1010-1030 ℃, and the finish rolling temperature is 860-890 ℃.
7. The controlled rolling and controlled cooling process of the 635MPa grade high-strength disc screw for the long span beam engineering as claimed in claim 4, wherein the spinning temperature is controlled at 840-950 ℃.
8. The controlled rolling and controlled cooling process of the 635MPa grade high-strength disc screw for the large span beam engineering according to claim 4, characterized in that in the air cooling process, 1-4#20 ten thousand meters3And (5) air cooling 50% of the branches respectively.
9. The controlled rolling and controlled cooling process of the 635MPa grade high-strength disc screw for the long span beam engineering according to claim 4, wherein when the heat-preservation cover is slowly cooled, the 6-16# heat-preservation cover is closed to carry out heat-preservation cover slow cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911347168.9A CN110923576B (en) | 2019-12-24 | 2019-12-24 | 635 MPa-grade high-strength disc screw for long-span beam engineering and controlled rolling and controlled cooling process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911347168.9A CN110923576B (en) | 2019-12-24 | 2019-12-24 | 635 MPa-grade high-strength disc screw for long-span beam engineering and controlled rolling and controlled cooling process thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110923576A true CN110923576A (en) | 2020-03-27 |
| CN110923576B CN110923576B (en) | 2021-07-27 |
Family
ID=69861863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911347168.9A Active CN110923576B (en) | 2019-12-24 | 2019-12-24 | 635 MPa-grade high-strength disc screw for long-span beam engineering and controlled rolling and controlled cooling process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110923576B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112680669A (en) * | 2020-12-22 | 2021-04-20 | 芜湖新兴铸管有限责任公司 | High-strength alloy cold forging steel B7 wire rod and production method thereof |
| CN114875316A (en) * | 2022-04-26 | 2022-08-09 | 湖南华菱湘潭钢铁有限公司 | High-strength deformed steel bar HRB600 and production method thereof |
| CN114892076A (en) * | 2022-04-26 | 2022-08-12 | 湖南华菱湘潭钢铁有限公司 | Production method of non-quenched and tempered cold heading steel wire rod for 8.8-grade bolt |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103225043A (en) * | 2013-04-12 | 2013-07-31 | 天津钢铁集团有限公司 | HRB500 and HRB500E coiled reinforcing steel bar production process |
| CN110306116A (en) * | 2019-08-02 | 2019-10-08 | 武汉钢铁集团鄂城钢铁有限责任公司 | A kind of plus ferro-silicon nitride HRB600 high-strength hot rolled ribbed steel bar and its manufacturing method |
-
2019
- 2019-12-24 CN CN201911347168.9A patent/CN110923576B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103225043A (en) * | 2013-04-12 | 2013-07-31 | 天津钢铁集团有限公司 | HRB500 and HRB500E coiled reinforcing steel bar production process |
| CN110306116A (en) * | 2019-08-02 | 2019-10-08 | 武汉钢铁集团鄂城钢铁有限责任公司 | A kind of plus ferro-silicon nitride HRB600 high-strength hot rolled ribbed steel bar and its manufacturing method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112680669A (en) * | 2020-12-22 | 2021-04-20 | 芜湖新兴铸管有限责任公司 | High-strength alloy cold forging steel B7 wire rod and production method thereof |
| CN114875316A (en) * | 2022-04-26 | 2022-08-09 | 湖南华菱湘潭钢铁有限公司 | High-strength deformed steel bar HRB600 and production method thereof |
| CN114892076A (en) * | 2022-04-26 | 2022-08-12 | 湖南华菱湘潭钢铁有限公司 | Production method of non-quenched and tempered cold heading steel wire rod for 8.8-grade bolt |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110923576B (en) | 2021-07-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110923576B (en) | 635 MPa-grade high-strength disc screw for long-span beam engineering and controlled rolling and controlled cooling process thereof | |
| CN104372247B (en) | A kind of 600MPa level high-strength quake-proof Screwbar muscle and preparation method thereof | |
| CN103805847B (en) | For making light coil rod reinforcing bar and the working method of prestressed concrete steel stick | |
| CN101985725B (en) | 780MPa grade low yield ratio steel plate for buildings and manufacturing method thereof | |
| CN103255349A (en) | Small-size 600MPa-level aseimatic twisted steel and manufacturing method thereof | |
| CN106702283A (en) | Method for producing thin-gauge S355J0W steel based on ESP sheet billet continuous casting and rolling process | |
| CN102978362B (en) | Thermal control and cold control process of ultralow-carbon fiber steel | |
| CN104988409A (en) | Non-annealed cold forging steel hot-rolled wire rod and production method thereof | |
| CN102418033B (en) | Heat-treatment-free high-strength cold heading steel and production method for hot rolled bar of heat-treatment-free high-strength cold heading steel | |
| CN102021495A (en) | 420 MPa weatherproof bridge steel with high ductility and method for manufacturing hot rolled coil of 420 MPa weatherproof bridge steel with high ductility | |
| CN101880826A (en) | Non-hardened bainite cold heading steel for fastener and manufacturing method thereof | |
| CN111378901B (en) | Special base metal wire rod for 1420 MPa-level PC steel rod and preparation method thereof | |
| CN109554613A (en) | A kind of production method of HRB500E high-strength anti-seismic steel bar | |
| CN102643970A (en) | Production method of hot-rolled ribbed bar coil | |
| CN102676937A (en) | Production technology of steel plate for X80 pipeline having low cost and high strength | |
| CN113802056A (en) | HRB600 hot-rolled high-strength coiled steel and production method thereof | |
| CN103540850B (en) | The super thick steel for engineering machinery of yield strength >=550MPa and production method | |
| CN101353759A (en) | Low crack sensitivity steel plate having 550Mpa grade of yield strength and manufacturing method thereof | |
| CN111621707B (en) | Steel for high-ductility cold-rolled steel bar CRB680H and production process thereof | |
| CN108251749A (en) | 460MPa grades of low yield strength ratio nuclear powers match effective steel plate and its production method | |
| CN101717898A (en) | HRB500E Nb-B composite microalloy microalloy anti-seismic steel bar and production method thereof | |
| CN114836608B (en) | Production method for reducing same-circle difference of HRB400E coiled steel bar performance | |
| CN116200665A (en) | HRB500E anti-seismic reinforcing steel bar and preparation method thereof | |
| CN115772595A (en) | Preparation method of phi 8mm low-cost high-quality high-strength fine-grain hot-rolled wire rod | |
| CN103122435A (en) | Hot-rolled titaniferous high-strength steel plate with yield strength higher than 700MPa and production method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |