CN112322985A - Annealing-free PSB830 finish-rolled deformed steel bar and production process thereof - Google Patents
Annealing-free PSB830 finish-rolled deformed steel bar and production process thereof Download PDFInfo
- Publication number
- CN112322985A CN112322985A CN202011296601.3A CN202011296601A CN112322985A CN 112322985 A CN112322985 A CN 112322985A CN 202011296601 A CN202011296601 A CN 202011296601A CN 112322985 A CN112322985 A CN 112322985A
- Authority
- CN
- China
- Prior art keywords
- rolling
- equal
- finish
- less
- steel
- 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.)
- Pending
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
- 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
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
-
- 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
- C22C38/04—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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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)
- Metal Rolling (AREA)
Abstract
The invention belongs to the field of metallurgy, and particularly relates to annealing-free PSB830 finish-rolled deformed steel bar and a production process thereof. An annealing-free PSB830 finish-rolled deformed steel bar comprises C, Si, Mn, P, S, V, Cr, Ni, Cu and N, and the balance of Fe and inevitable impurity elements. The main heat treatment process parameters are as follows: (1) the initial rolling temperature of the rough medium rolling is 1100-1150 ℃; (2) the finish rolling temperature is 850-890 ℃; (3) the temperature of the upper cooling bed is more than or equal to 850 ℃; the invention adopts the domestic pioneering use of high-nitrogen ferrovanadium alloy as the core, adds noble metals such as Cr, Ni, Al and the like, reasonably configures, and adopts high-temperature rolling to form the unique high-nitrogen ferrovanadium hot rolling technology of permanent steel. The method is completely different from the traditional composition system strengthened by the high-Mn high-S high-Cr V, Mo microalloy in the industry, or the PSB400 is rolled firstly and then processed to be above the level of the PSB830 by utilizing an off-line heat treatment process.
Description
Technical Field
The invention belongs to the field of metallurgy, and particularly relates to annealing-free PSB830 finish-rolled deformed steel bar and a production process thereof.
Background
The PSB830 is widely applied to continuous beams and large frame structures in large-scale hydraulic engineering, industrial and civil buildings, highway and railway large-mid-span bridges, nuclear power stations, ground anchors and other projects. The annealing-free finish rolling deformed steel bar is subject to the national standard GB/T20065-2016, and the strength grade of the steel bar is 830MPa grade. The 830MPa steel bar (PSB 830) has an Agt specification of not less than 3.5% and an elongation of 7%. The deformed steel bar for prestressed concrete is a straight steel bar which is hot rolled to have discontinuous external screw thread, and the steel bar can be connected or anchored by using connector or anchorage device with matched internal screw thread at any section. The method is widely applied to continuous beams and large frame structures in large-scale hydraulic engineering, industrial and civil buildings, and projects such as highway, railway large-midspan bridges, nuclear power stations and ground anchors, can adapt to environments such as ports, wharfs and sea-crossing bridges, can reduce risks and prolong the service life of buildings.
The intensity grade of the annealing-free finish rolling deformed steel bar is 830MPa grade, and the diameter is 25-42 mm. The microstructure comprises pearlite, ferrite, bainite and a precipitation structure, and the microstructure has good performance, the elongation of the steel bar is not less than 7%, and the maximum force total elongation is not less than 3.5%.
The non-annealed rebar must be suitable for use in reinforcement structures having high ductility requirements. When the requirements of the upper limit of the yield strength and the yield ratio of the steel bar required by the structural design are met, the design and use requirements of various structures (including primary and secondary anti-seismic structures) are also required to be met.
At present, the difficult problems of the finish rolling deformed steel have the following industrialism: the production process is long, the process is complex, the production difficulty is high, and the product has a long aging period of 1-3 months. The production process is long, so that the surface quality damage is inevitably caused by a large number of product turnover times, the protection requirement is high, and the management cost of an enterprise is high. Meanwhile, because the strength is high, the internal stress of the steel bar is large, the dissipation time is long, the situation of brittle failure is easy to occur, and the potential safety hazard is large, only a very individual manufacturer for rolling the steel bar in China has no profit basically, and even though the profit of each ton of steel is high, the steel enterprises are damaged comprehensively, so the steel bar above the PSB830 grade of finish-rolled deformed steel bar is known as 'deformed steel crown pearl'.
Disclosure of Invention
Aiming at the defects in the prior art, the invention adopts an advanced design concept, perfectly solves the problems of the prior finish rolling deformed steel bar industry, does not need to build a new heat treatment workshop, simplifies the production flow, reduces the production cost, shortens the time-effective period and improves the product quality stability according to the prior tooling equipment.
The invention provides annealing-free PSB830 finish-rolled deformed steel bar, which comprises the following components in percentage by mass: c: 0.50% -0.55%, Si: 0.80% -1.10%, Mn: 1.20-1.50%, P is less than or equal to 0.025%, S is less than or equal to 0.025%, V: 0.120-0.180%, Cr is less than or equal to 0.10%, Ni is less than or equal to 0.10%, Cu is less than or equal to 0.10%, N: 250ppm-300ppm, and the balance of Fe and inevitable impurity elements.
Further, the weight percentage of each component is as follows: c: 0.52%, Si: 1.00%, Mn: 1.30%, P is less than or equal to 0.025%, S is less than or equal to 0.025%, V: 0.150%, Cr is less than or equal to 0.10%, Ni is less than or equal to 0.10%, Cu is less than or equal to 0.10%, N: 280ppm, and the balance of Fe and inevitable impurity elements.
A production process of annealing-free PSB830 finish-rolled deformed steel bar comprises the following steps:
s1: melting the raw materials into molten steel;
s2: after refining the molten steel, casting the molten steel into a steel billet;
s3: conveying the steel billet to a steel rolling heating furnace for heating, and then performing rough and medium rolling operation on a frame rough rolling unit to obtain a rough and medium rolled steel billet; wherein the initial rolling temperature is 1100-1150 ℃;
s4: carrying out finish rolling on the rough medium rolled steel billet, wherein the finish rolling temperature is 850-890 ℃;
s5: and (3) cooling the finish-rolled steel bars on a cooling bed, wherein the temperature of the cooling bed is more than or equal to 850 ℃.
Furthermore, the annealing-free PSB830 fully utilizes the composite strengthening effect of V and N elements, the N content reaches 250ppm-300ppm, and the strengthening effect of VN precipitates is fully precipitated.
Further, the heat treatment process parameters are specifically as follows:
(1) the initial rolling temperature is 1120 ℃;
(2) the precision rolling temperature is 860 ℃;
the invention reforms the production equipment according to the technical requirement of full-flow continuous temperature control rolling, comprehensively utilizes the recrystallization, non-recrystallization and deformation induced ferrite mechanism and the process measures of controlled cooling after rolling and the like according to the actual production equipment parameters of the rough rolling unit, the middle rolling unit and the finishing rolling unit of the steel bar rolling production line, and achieves the purposes of controlling the grain growth and the tissue homogenization.
Due to reasonable chemical components and contents thereof and the adoption of a hot rolling process, the metallographic structure of a finished product is mainly ferrite and pearlite, the structure is uniform, low-temperature structures such as martensite and bainite and other structures which do not influence the mechanical property are not generated, and therefore, a yield platform of a write-in tensile curve is ensured, and the product is better suitable for projects. The pure hot rolling process has the advantages of ensuring the uniformity of a metallographic structure by 100 percent and having very high reliability. Compared with the traditional production modes, the quenching and tempering heat treatment process is adopted, so that the obtained PSB830 and the PSB830 structure produced by the permanent steel are not disordered and have other structures with the mechanical properties influenced.
The GB/T20065-2017 standard only requires that the P, S content of the steel bar is not more than 0.035%, and the rest components are designed by the manufacturer. In order to ensure the ultrahigh strength requirement of the steel bar, more V alloy needs to be added, the addition amount of the alloy is large, the requirements on steel-making temperature drop and continuous casting and casting are high, and steel-making refining, continuous casting and electromagnetic stirring are generally needed, and high-pressure water descaling is needed for steel rolling and steel rolling. The second steel-making factory, the third steel-making factory and the first bar factory of the permanent steel all have the tooling conditions, and the expected smelting and rolling process can be realized.
On the basis of adopting an alloying mode, the permanent steel utilizes production equipment owned by the permanent steel to redesign a new rolling process to produce the annealing-free PSB830, so that the problems of production line modification, series equipment modification and cost input caused by the production line modification can be avoided; on the other hand, the method is also beneficial to the large-scale and rapid production and popularization of new products. Meanwhile, the process route is optimized, the alloying mode is taken as the main mode, the rolling process approach is taken as the auxiliary mode, the production cost of the product is reduced, the product quality is stabilized, the production technology of the product is mature day by day, and enterprises have continuous innovation capability and smaller technical risk.
The invention has the beneficial effects that:
(1) the invention adopts the domestic pioneering use of high-nitrogen ferrovanadium alloy as the core, adds noble metals such as Cr, Ni, Al and the like, reasonably configures, and adopts high-temperature rolling to form the unique high-nitrogen ferrovanadium hot rolling technology of permanent steel. The method is completely different from the traditional composition system strengthened by the high-Mn high-S high-Cr V, Mo microalloy in the industry, or the PSB400 is rolled firstly and then processed to be above the level of the PSB830 by utilizing an off-line heat treatment process. The novel alloy is innovatively adopted in the technology, the traditional cognition of the industry is overturned, the high-nitrogen reinforced alloy is taken as a main body, and the rolling is directly carried out by matching with professional operation.
(2) The invention utilizes the high-nitrogen ferrovanadium to successfully carry out deep research on the phase change mechanism by combining theoretical knowledge on the basis of the application of HTRB600(E), actively communicates with a steel mill, a steel mill and a steel research institute, formulates a production process and produces the PSB830 steel bar meeting the national standard requirement. The strength of the newly designed high-nitrogen ferrovanadium billet can reach the level of PSB830MPa after the test is carried out. The time-effective period is shortened from more than 3 months to half a month, and the product competitiveness is greatly improved. The unique high-nitrogen ferrovanadium hot-rolling PSB830 technology for the permanent steel is realized in China, and the brand influence of the high-end building materials of the permanent steel is greatly improved.
(3) The invention combines chemical composition regulation and control, utilizes the mechanisms of microalloy fine grain strengthening, recrystallization rolling, non-recrystallization rolling and deformation induced ferrite to distribute the temperature control of each stage according to the difference of the rolling speed and the reduction of a rough rolling mill, a medium rolling mill and a finishing rolling mill, and realizes the refinement and the homogenization of the microstructure of the steel through the continuous temperature control and the deformation rolling process. In the aspect of process arrangement, the defects of the traditional process are overcome, the temperature control sections are arranged among all the units, the setting of the recovery sections is not needed, and various control mechanisms can be comprehensively utilized and the requirements of controlled rolling of different specifications and components can be met.
(4) The PSB830 produced by the QST process of the water penetration process has long aging period of more than 3 months, low product competitiveness and low continuous sales. By using the PSB830 hot-rolled by high-nitrogen ferrovanadium, the aging period is shortened to half a month, the quality stability of the product is improved, the competitiveness is greatly improved, the sales volume can be greatly improved, huge economic benefits are created, and the brand influence of high-end building materials in the market can be improved.
(5) The annealing-free PSB830 finish-rolled deformed steel bar produced by the invention has the characteristics of simple connection and anchoring, safe and reliable tension anchoring, strong adhesion, convenient construction and the like, and avoids the fracture caused by internal stress, unstable structure and the like caused by welding due to the omission of a welding process. Meets the requirement of national economic development, thereby becoming an essential material in large-scale structures.
Drawings
FIG. 1 is a metallographic structure of a sample of example 1 of the present invention, a-side, b-1/2 radius, c-center.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
The annealing-free PSB830 finish-rolled deformed steel bar comprises the following components in percentage by mass: c: 0.50% -0.55%, Si: 0.80% -1.10%, Mn: 1.20-1.50%, P is less than or equal to 0.025%, S is less than or equal to 0.025%, V: 0.120-0.180%, Cr is less than or equal to 0.10%, Ni is less than or equal to 0.10%, Cu is less than or equal to 0.10%, N: 250ppm-300ppm, and the balance of Fe and inevitable impurity elements.
A production process of annealing-free PSB830 finish-rolled deformed steel bar comprises the following steps:
s1: melting the raw materials into molten steel;
s2: after refining the molten steel, casting the molten steel into a steel billet;
s3: conveying the steel billet to a steel rolling heating furnace for heating, and then performing rough and medium rolling operation on a frame rough rolling unit to obtain a rough and medium rolled steel billet; the initial rolling temperature is 1100-1150 ℃;
s4: carrying out finish rolling on the rough medium rolled steel billet, wherein the finish rolling temperature is 850-890 ℃;
s5: and (3) cooling the finish-rolled steel bars on a cooling bed, wherein the temperature of the cooling bed is more than or equal to 850 ℃.
The development of the annealing-free PSB830 utilizes the use experience of high-nitrogen ferrovanadium in a 600 MPa-level steel bar, and through deep research on the action mechanism of the high-nitrogen ferrovanadium, the nitrogen content in the steel just reaches a theoretical value by designing a scientific and reasonable chemical system, so that the V (N, C) precipitation strengthening effect is fully exerted. The microalloying of the steel bar structure can be realized through the interaction among various elements such as V, N, the microstructure of the obtained steel bar comprises pearlite, ferrite, bainite and a precipitation structure, the performance of the microstructure is good, and the strength of the steel bar is improved.
Meanwhile, high-nitrogen ferrovanadium is used for replacing vanadium-nitrogen alloy microalloying, the rolling process is changed from the original QST process into hot rolling, the toughness of the produced steel bar is greatly improved, the stability of the strength is also improved, and the product competitiveness is greatly improved.
TABLE 1 melting composition
| Number plate | Batch number | C/％ | Si/％ | Mn/％ | Cr/％ | V/％ | Ni/％ | Cu/％ | N/ppm | |
| Example 1 | PSB830 | 20B504982 | 0.518 | 0.854 | 1.48 | 0.04 | 0.167 | 0.012 | 0.03 | 294 |
| Example 2 | PSB830 | 20B510415 | 0.523 | 0.837 | 1.46 | 0.02 | 0.173 | 0.016 | 0.02 | 288 |
Example 1
An annealing-free PSB830 finish-rolled deformed steel bar is manufactured by the following steps: 20B 504982;
the mass percentage of each component is as follows: c: 0.518%, Si: 0.854%, Mn: 1.48%, P is less than or equal to 0.025%, S is less than or equal to 0.025%, V: 0.167%, Cr 0.04%, Ni 0.012%, Cu 0.03%, N: 294ppm, and the balance Fe and inevitable impurity elements.
A production process of annealing-free PSB830 finish-rolled deformed steel bar comprises the following steps:
s1: melting the raw materials into molten steel;
s2: after refining the molten steel, casting the molten steel into a steel billet;
s3: conveying the steel billet to a steel rolling heating furnace for heating, and then performing rough and medium rolling operation on a frame rough rolling unit to obtain a rough and medium rolled steel billet; the initial rolling temperature is 1120 ℃;
s4: carrying out finish rolling on the rough and medium rolled steel billet, wherein the finish rolling temperature is 860 ℃;
s5: and (3) cooling the finish-rolled steel bars on a cooling bed, wherein the temperature of the cooling bed is more than or equal to 850 ℃.
Performance test data:
| specification/mm | Rm/MPa | Rel/MPa | A5/％ | Agt/％ |
| 32 | ≥1050 | ≥855 | ≥7.0 | ≥3.5 |
As can be seen from the metallographic structure diagram of figure 1 of the attached drawings,
example 2
An annealing-free PSB830 finish-rolled deformed steel bar is manufactured by the following steps: 20B 510415;
the mass percentage of each component is as follows: c: 0.523%, Si: 0.837%, Mn: 1.46 percent, P is less than or equal to 0.025 percent, S is less than or equal to 0.025 percent, V: 0.173%, Cr 0.02%, Ni 0.016%, Cu 0.02%, N: 288ppm, and the balance Fe and inevitable impurity elements.
The production process of the annealing-free PSB830 finish-rolled deformed steel bar is characterized by comprising the following steps of:
s1: melting the raw materials into molten steel;
s2: after refining the molten steel, casting the molten steel into a steel billet;
s3: conveying the steel billet to a steel rolling heating furnace for heating, and then performing rough and medium rolling operation on a frame rough rolling unit to obtain a rough and medium rolled steel billet; the initial rolling temperature is 1130 ℃;
s4: carrying out finish rolling on the rough and medium rolled steel billet, wherein the finish rolling temperature is 880 ℃;
s5: and (3) cooling the finish-rolled steel bars on a cooling bed, wherein the temperature of the cooling bed is more than or equal to 850 ℃.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (4)
1. The annealing-free PSB830 finish-rolled deformed steel bar is characterized by comprising the following components in percentage by mass: c: 0.50% -0.55%, Si: 0.80% -1.10%, Mn: 1.20-1.50%, P is less than or equal to 0.025%, S is less than or equal to 0.025%, V: 0.120-0.180%, Cr is less than or equal to 0.10%, Ni is less than or equal to 0.10%, Cu is less than or equal to 0.10%, N: 250ppm-300ppm, and the balance of Fe and inevitable impurity elements.
2. The annealing-free PSB830 finish-rolled deformed steel bar as claimed in claim 1, wherein the compositions in percentage by mass are: c: 0.52%, Si: 1.00%, Mn: 1.30%, P is less than or equal to 0.025%, S is less than or equal to 0.025%, V: 0.150%, Cr is less than or equal to 0.10%, Ni is less than or equal to 0.10%, Cu is less than or equal to 0.10%, N: 280ppm, and the balance of Fe and inevitable impurity elements.
3. The production process of the annealing-free PSB830 finish-rolled deformed steel bar is characterized by comprising the following steps of:
s1: melting the raw materials into molten steel;
s2: after refining the molten steel, casting the molten steel into a steel billet;
s3: conveying the steel billet to a steel rolling heating furnace for heating, and then performing rough and medium rolling operation on a frame rough rolling unit to obtain a rough and medium rolled steel billet; wherein the initial rolling temperature is 1100-1150 ℃;
s4: carrying out finish rolling on the rough medium rolled steel billet, wherein the finish rolling temperature is 850-890 ℃;
s5: and (3) cooling the finish-rolled steel bars on a cooling bed, wherein the temperature of the cooling bed is more than or equal to 850 ℃.
4. The process for producing the annealing-free PSB830 finish-rolled deformed steel bar as set forth in claim 3, wherein the heat treatment process parameters are as follows:
(1) the initial rolling temperature is 1120 ℃;
(2) the finish rolling temperature was 860 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011296601.3A CN112322985A (en) | 2020-11-18 | 2020-11-18 | Annealing-free PSB830 finish-rolled deformed steel bar and production process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011296601.3A CN112322985A (en) | 2020-11-18 | 2020-11-18 | Annealing-free PSB830 finish-rolled deformed steel bar and production process thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112322985A true CN112322985A (en) | 2021-02-05 |
Family
ID=74322652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011296601.3A Pending CN112322985A (en) | 2020-11-18 | 2020-11-18 | Annealing-free PSB830 finish-rolled deformed steel bar and production process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112322985A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115418570A (en) * | 2022-09-15 | 2022-12-02 | 联峰钢铁（张家港）有限公司 | Hot-rolled wire rod for annealing-free tool and production control process thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101327491A (en) * | 2007-06-18 | 2008-12-24 | 首钢总公司 | Method for producing high-intensity fine rolling screwed reinforcement |
| CN102363832A (en) * | 2011-11-07 | 2012-02-29 | 天津钢铁集团有限公司 | Production technology of finish-rolled ribbed bars |
| CN103774040A (en) * | 2014-01-17 | 2014-05-07 | 河北钢铁股份有限公司承德分公司 | PSB830 finish rolling threaded steel and process for smelting steel by use of vanadium-titanium-containing molten iron |
| CN104294162A (en) * | 2014-11-04 | 2015-01-21 | 武钢集团昆明钢铁股份有限公司 | Twisted steel for 785 MPa-level high-strength prestressed structure and preparation method of twisted steel |
| CN104328338A (en) * | 2014-10-30 | 2015-02-04 | 武汉钢铁(集团)公司 | Small-scale finish-rolled twisted steel and production method thereof |
| CN105296853A (en) * | 2015-11-30 | 2016-02-03 | 山东石横特钢集团有限公司 | 930-MPa high-strength finished deformed steel bars and preparation technology thereof |
| CN110343962A (en) * | 2019-07-26 | 2019-10-18 | 马鞍山钢铁股份有限公司 | A kind of 700Mpa grades or more hot-rolled ribbed high tensile reinforcement steel and its production method |
| CN110760735A (en) * | 2019-11-15 | 2020-02-07 | 南京钢铁股份有限公司 | PSB830 finish-rolled twisted steel and production method thereof |
-
2020
- 2020-11-18 CN CN202011296601.3A patent/CN112322985A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101327491A (en) * | 2007-06-18 | 2008-12-24 | 首钢总公司 | Method for producing high-intensity fine rolling screwed reinforcement |
| CN102363832A (en) * | 2011-11-07 | 2012-02-29 | 天津钢铁集团有限公司 | Production technology of finish-rolled ribbed bars |
| CN103774040A (en) * | 2014-01-17 | 2014-05-07 | 河北钢铁股份有限公司承德分公司 | PSB830 finish rolling threaded steel and process for smelting steel by use of vanadium-titanium-containing molten iron |
| CN104328338A (en) * | 2014-10-30 | 2015-02-04 | 武汉钢铁(集团)公司 | Small-scale finish-rolled twisted steel and production method thereof |
| CN104294162A (en) * | 2014-11-04 | 2015-01-21 | 武钢集团昆明钢铁股份有限公司 | Twisted steel for 785 MPa-level high-strength prestressed structure and preparation method of twisted steel |
| CN105296853A (en) * | 2015-11-30 | 2016-02-03 | 山东石横特钢集团有限公司 | 930-MPa high-strength finished deformed steel bars and preparation technology thereof |
| CN110343962A (en) * | 2019-07-26 | 2019-10-18 | 马鞍山钢铁股份有限公司 | A kind of 700Mpa grades or more hot-rolled ribbed high tensile reinforcement steel and its production method |
| CN110760735A (en) * | 2019-11-15 | 2020-02-07 | 南京钢铁股份有限公司 | PSB830 finish-rolled twisted steel and production method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115418570A (en) * | 2022-09-15 | 2022-12-02 | 联峰钢铁（张家港）有限公司 | Hot-rolled wire rod for annealing-free tool and production control process thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112981235B (en) | Hardened and tempered steel plate with yield strength of 420MPa grade for building structure and production method thereof | |
| CN110565016B (en) | 630MPa high-strength anti-seismic index reinforcing steel bar and production method thereof | |
| CN110184525B (en) | High-strength Q500GJE quenched and tempered steel plate for building structure and manufacturing method thereof | |
| CN100395368C (en) | Niobium titanium -combined microalloying steel for cooling-control reinforced bar and method for producing same | |
| CN107385329A (en) | A kind of big thickness Q500GJE high-strength buildings structural steel plate and its manufacture method | |
| CN106756618B (en) | 100mm thickness Q420GJC/D controlled rolling state high-strength structure steel plates | |
| CN106521320B (en) | Special thickness Q460GJC/D controlled rolling state high-strength structure steel plates | |
| CN102392187B (en) | Cr-containing pipeline steel X70 hot-rolled plate and production method | |
| CN111088451A (en) | 600 MPa-level steel bar for reinforced concrete and production method thereof | |
| CN112501498A (en) | Wire rod for 2300MPa prestressed steel strand and production method thereof | |
| CN110983190A (en) | 645 MPa-level high-strength anti-seismic ribbed steel bar and production method thereof | |
| CN107604248B (en) | A kind of high intensity Q500GJD quenched and tempered state steel plate for building structure and its manufacturing method | |
| CN114411061B (en) | High-strength anti-seismic steel bar and preparation method thereof | |
| CN106435384A (en) | Vanadium-containing automobile structural steel and production method thereof | |
| CN102409233A (en) | Steel for low-temperature engineering machinery and production method thereof | |
| CN111500920A (en) | HRB600 high-strength anti-seismic deformed steel bar and production method thereof | |
| CN115094315A (en) | Economical niobium-chromium reinforced 420 MPa-level bridge steel plate and production method thereof | |
| CN114457290A (en) | 1200 MPa-grade precipitation-strengthened vanadium-containing high-manganese austenitic steel and preparation method thereof | |
| CN110760735A (en) | PSB830 finish-rolled twisted steel and production method thereof | |
| CN111334719A (en) | high-N composite reinforced 500 MPa-grade and 600 MPa-grade steel bar, smelting method and production method | |
| CN111321342A (en) | One-steel multi-stage cold-rolled low-alloy high-strength steel and manufacturing method thereof | |
| CN112322985A (en) | Annealing-free PSB830 finish-rolled deformed steel bar and production process thereof | |
| CN113462966A (en) | Economical 630MPa high-strength anti-seismic steel bar steel and production method thereof | |
| CN113388781B (en) | Method for producing HRB600E threaded steel bar by high-speed bar and HRB600E threaded steel bar produced by high-speed bar | |
| CN113462965B (en) | Steel for rolling 635 MPa-grade high-strength anti-seismic reinforcing steel bar in two-phase region 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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210205 |
|
| RJ01 | Rejection of invention patent application after publication |