CN114505341A - Hot rolling process method for reinforcing steel bars of dense-pitch threaded rib anchor rod - Google Patents
Hot rolling process method for reinforcing steel bars of dense-pitch threaded rib anchor rod Download PDFInfo
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- CN114505341A CN114505341A CN202111610542.7A CN202111610542A CN114505341A CN 114505341 A CN114505341 A CN 114505341A CN 202111610542 A CN202111610542 A CN 202111610542A CN 114505341 A CN114505341 A CN 114505341A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- 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
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- 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
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a hot rolling process method of a dense pitch thread rib anchor rod reinforcing steel bar, which comprises the following chemical components in percentage by weight: c: 0.25 to 0.30%, Si: 0.40-0.60%, Mn: 1.40-1.60%, S is less than or equal to 0.030%, P is less than or equal to 0.030%, V: 0.040-0.060%, the content of O is controlled below 50ppm, and the balance is Fe and inevitable impurities; and (3) enabling the hot blank to enter a rough and medium rolling, pre-finish rolling and finish rolling area, adopting a full-line micro-tension technology and a loop precision control technology, performing controlled cooling after rolling, performing heat preservation through a cooling bed heat preservation cover, and finally rolling to obtain the bolt reinforcing steel bar with the screw thread rib with the dense pitch. The billet of the combined components adopts a process route of 'low-temperature rolling and controlled rolling', so that the prepared anchor rod steel bar has good mechanical property and excellent elongation after fracture, meets the requirement of the anchor rod steel bar, and can realize stable production of the anchor rod steel bar with a dense pitch of 4.5 +/-0.15 mm.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a hot rolling process method for a dense-pitch thread rib anchor rod reinforcing steel bar.
Background
The threaded rib anchor rod reinforcing steel bar rolled by the hot rolling process method has a certain gap and a certain forward slip coefficient before and after rolling, so that the smaller the thread pitch of the threaded rib is, the greater the hot rolling production difficulty is. The threaded rib anchor rod with the thread pitch of 4.5 +/-0.15 mm has the highest rib aligning precision and high production difficulty, and various mechanical properties of the threaded rib anchor rod with the thread pitch of 4.5 +/-0.15 mm manufactured by the existing process can not meet the requirements easily.
Disclosure of Invention
The invention aims to provide a hot rolling process method of a fine-pitch thread rib anchor rod steel bar, which has excellent elongation after fracture and meets the requirement of the anchor rod steel bar.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a hot rolling process method for a steel bar of a bolt with a dense-pitch threaded rib comprises the following chemical components in percentage by weight: c: 0.25 to 0.30%, Si: 0.40-0.60%, Mn: 1.40-1.60%, S is less than or equal to 0.030%, P is less than or equal to 0.030%, V: 0.040-0.060%, the content of O is controlled below 50ppm, and the balance is Fe and inevitable impurities;
the production process adopts the working procedures of converter smelting, LF furnace refining, strong deoxidation, furnace bottom argon blowing and billet continuous casting to smelt steel billets; the billet steel enters a steel rolling heating furnace to be heated; and (3) enabling the hot blank to enter a rough and medium rolling, pre-finish rolling and finish rolling area, adopting a full-line micro-tension technology and a loop precision control technology, performing controlled cooling after rolling, performing heat preservation through a cooling bed heat preservation cover, and finally rolling to obtain the bolt reinforcing steel bar with the screw thread rib with the dense pitch.
Preferably, the MG600Z phi 22 fine pitch thread rib anchor rod reinforcing steel bar comprises the following chemical components in percentage by weight: c: 0.25 to 0.30%, Si: 0.40-0.60%, Mn: 1.40-1.60%, S is less than or equal to 0.030%, P is less than or equal to 0.030%, V: 0.040-0.060%, the content of O is controlled below 50ppm, and the balance is Fe and inevitable impurities;
the production process adopts the working procedures of converter smelting, LF furnace refining, strong deoxidation, furnace bottom argon blowing and billet continuous casting to smelt steel billets; the billet steel enters a steel rolling heating furnace to be heated; and (3) the hot blank enters a rough and medium rolling, pre-finish rolling and finish rolling area, the full-line micro-tension technology and the loop precision control technology are adopted, controlled cooling is carried out after rolling, heat preservation is carried out through a cold bed heat preservation cover, and finally the MG600Z phi 22 tight pitch thread rib anchor rod reinforcing steel bar is rolled.
Preferably, the initial rolling temperature of the billet is 960-1000 ℃.
Preferably, the rolling temperature is controlled to be 940-980 ℃.
Preferably, the K1-K3 inlet guides and guards all adopt rolling guides and guards.
Preferably, the K1 roller connecting shaft adopts a novel crank type phase connecting shaft.
Preferably, the pitch of the finished steel bar of the dense pitch thread rib anchor rod is controlled to be 4.5 +/-0.15 mm.
Compared with the prior art, the invention has the advantages that:
the billet of the combined components adopts a process route of 'low-temperature rolling and controlled rolling', the rolling temperature is set to be 960-1000 ℃, the finish rolling temperature is 940-980 ℃, a full-line micro-tension technology and a loop precise control technology are adopted, the K1-K3 inlet guides and guards all adopt rolling guides and guards, the controlled cooling after rolling and the heat preservation of a cooling bed heat preservation cover are adopted, the prepared anchor rod steel bar has good mechanical property and excellent elongation after breakage, the requirement of the anchor rod steel bar is met, and the stable production of the anchor rod steel bar with the dense pitch of 4.5 +/-0.15 mm can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a graph of mechanical properties of steel bars according to examples of the present invention and comparative examples.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention will be more clearly and clearly defined.
Example one
A hot rolling process method for a steel bar MG600Z phi 22 of a dense-pitch thread rib anchor rod comprises the following steps of selecting chemical components: 0.25%, Si: 0.48%, Mn: 1.47%, S:0.020%, P:0.015%, V: 0.046%, 40ppm of O, and the balance of Fe and inevitable impurities; the production process adopts the working procedures of converter smelting, LF furnace refining, strong deoxidation, furnace bottom argon blowing and small square billet continuous casting to smelt steel billets; heating the qualified steel billet in a steel rolling heating furnace at the initial rolling temperature of 985 ℃; the hot blank enters a rough and medium rolling, pre-finish rolling and finish rolling area, a full-line micro-tension technology and a loop precision control technology are adopted, K1-K3 inlet guides and guards all adopt rolling guides, the rolling temperature is controlled to be 950 ℃, cooling is controlled after rolling, the heat preservation of a cold bed heat preservation cover is carried out, a K1 roller connecting shaft adopts a novel crankshaft type phase connecting shaft, the screw pitch is controlled to be 4.52mm, and finally dense-pitch thread rib anchor rod reinforcing steel bars MG600Z phi 22 are rolled;
the yield strength is 650MPa, the tensile strength is 840MPa, and the elongation after fracture is 18.5%.
Example two
A hot rolling process method for a steel bar MG600Z phi 22 of a dense-pitch thread rib anchor rod comprises the following steps of selecting chemical components: 0.26%, Si: 0.52%, Mn: 1.46%, S:0.020%, P:0.018%, V: 0.048%, 40ppm of O, and the balance of Fe and inevitable impurities; the production process adopts the working procedures of converter smelting, LF furnace refining, strong deoxidation, furnace bottom argon blowing and billet continuous casting to smelt steel billets; heating the qualified steel billets in a steel rolling heating furnace, wherein the initial rolling temperature of the steel billets is 990 ℃; the hot blank enters a rough and medium rolling, pre-finish rolling and finish rolling area, a full-line micro-tension technology and a loop precision control technology are adopted, K1-K3 inlet guides and guards all adopt rolling guides and guards, the rolling temperature is controlled to be 965 ℃, cooling is controlled after rolling, the heat preservation of a cooling bed heat preservation cover is carried out, a K1 roller connecting shaft adopts a novel crankshaft type phase connecting shaft, the screw pitch is controlled to be 4.52mm, and finally, a dense-pitch thread rib anchor rod reinforcing steel bar MG600Z phi 22 is rolled;
the yield strength is 655MPa, the tensile strength is 850MPa, and the elongation after fracture is 18.0%.
EXAMPLE III
A hot rolling process method for a steel bar MG600Z phi 22 of a dense-pitch thread rib anchor rod comprises the following steps of selecting chemical components: 0.30%, Si: 0.50%, Mn: 1.52%, S0.024%, P0.020%, V: 0.050%, 40ppm of O, and the balance of Fe and inevitable impurities; the production process adopts the working procedures of converter smelting, LF furnace refining, strong deoxidation, furnace bottom argon blowing and small square billet continuous casting to smelt steel billets; heating the qualified steel billets in a steel rolling heating furnace, wherein the initial rolling temperature of the steel billets is 980 ℃; the hot blank enters a rough and medium rolling, pre-finish rolling and finish rolling area, a full-line micro-tension technology and a loop precise control technology are adopted, a K1-K3 inlet guide totally adopts a rolling guide, the rolling temperature is controlled at 972 ℃, the cooling is controlled after rolling, the heat preservation of a cooling bed heat preservation cover is carried out, a K1 roller connecting shaft adopts a novel crankshaft type phase connecting shaft, and finally a dense pitch thread rib anchor rod reinforcing steel bar MG600Z phi 22 is rolled, the yield strength is 645MPa, the tensile strength is 840MPa, the elongation after breakage is 19.0%, and the pitch is controlled at 4.52 mm.
Comparative example 1
The difference between the third embodiment and the second embodiment is that the initial rolling temperature is 1020 ℃ and the rolling is not controlled;
a hot rolling process method for a steel bar MG600Z phi 22 of a dense-pitch thread rib anchor rod comprises the following steps of selecting chemical components: 0.30%, Si: 0.50%, Mn: 1.52%, S:0.024%, P:0.020%, V: 0.050%, 40ppm of O, and the balance of Fe and inevitable impurities; the production process adopts the working procedures of converter smelting, LF furnace refining, strong deoxidation, furnace bottom argon blowing and billet continuous casting to smelt steel billets; heating the qualified steel billets in a steel rolling heating furnace, wherein the initial rolling temperature of the steel billets is 1020 ℃; the hot blank enters a rough and medium rolling, pre-finish rolling and finish rolling area, a full-line micro-tension technology and a loop precision control technology are adopted, a K1-K3 inlet guide and guide all adopt rolling guide and guide, uncontrolled rolling is adopted, a cold bed heat preservation cover is used for preserving heat, the screw pitch is controlled to be 4.52mm, finally, a dense-screw-pitch thread rib anchor rod reinforcing steel bar MG600Z phi 22 is rolled, the yield strength is 615MPa, the tensile strength is 815MPa, and the elongation after fracture is 15.5%.
Comparative example No. two
The difference between the present embodiment and the second embodiment is the weight percentage of the chemical components;
a hot rolling process method for a steel bar MG600Z phi 22 of a dense-pitch thread rib anchor rod comprises the following steps of selecting chemical components: 0.32%, Si: 0.65%, Mn: 1.30%, S:0.035%, P:0.035%, V: 0.065%, 50ppm of O, and the balance of Fe and inevitable impurities; the balance of Fe and inevitable impurities; the production process adopts the working procedures of converter smelting, LF furnace refining, strong deoxidation, furnace bottom argon blowing and billet continuous casting to smelt steel billets; heating the qualified steel billets in a steel rolling heating furnace, wherein the initial rolling temperature of the steel billets is 990 ℃; the hot blank enters a rough and medium rolling, pre-finish rolling and finish rolling area, a full-line micro-tension technology and a loop precision control technology are adopted, K1-K3 inlet guides and guards all adopt rolling guides, the rolling temperature is controlled at 965 ℃, cooling is controlled after rolling, the heat preservation of a cold bed heat preservation cover is carried out, a K1 roller connecting shaft adopts a novel crankshaft type phase connecting shaft, the screw pitch is controlled at 4.52mm, and finally dense-pitch thread rib anchor rod reinforcing steel bars MG600Z phi 22 are rolled;
the yield strength is 621MPa, the tensile strength is 817MPa, and the elongation after fracture is 16.2%.
The working principle of micro-tension is to realize tension-free rolling between two adjacent racks, automatically correct the speed through the speed cascade relation of the upstream rack and the downstream rack, keep the second flow of metal equal and obtain a high-quality finished bar;
the accurate loop control refers to an automatic control technology, in particular to a technology for controlling a loop of a finishing mill. The loop mechanism is used as a loop quantity detection device to measure the loop quantity between the frames, and the loop quantity is kept constant through the adjustment of the loop height control system, so that the stable continuous rolling process is ensured. The second purpose of the loop mechanism is to control the constant small tension of the strip steel as an actuating mechanism so as to avoid the phenomena of steel pulling and steel stacking and reduce the coupling and mutual interference between the frames and between the functions caused by the change of the tension of the strip steel as much as possible.
As shown in the figure I, compared data show that the steel billet with the combined components is subjected to a process route of low-temperature initial rolling and controlled rolling, the initial rolling temperature is set to 960-1000 ℃, the finish rolling temperature is 940-980 ℃, the full-line micro-tension technology and the loop precision control technology are adopted, the K1-K3 import guides and guards all adopt rolling guides and guards, the cooling is controlled after rolling, and the heat preservation of a cooling bed heat preservation cover is carried out, so that the mechanical properties of the prepared steel bar are superior to those of the steel bar prepared in the comparative example.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, various changes or modifications may be made by the patentees within the scope of the appended claims, and within the scope of the invention, as long as they do not exceed the scope of the invention described in the claims.
Claims (7)
1. A hot rolling process method for reinforcing steel bars of a dense-pitch threaded rib anchor rod is characterized by comprising the following steps: comprises the following chemical components in percentage by weight: c: 0.25 to 0.30%, Si: 0.40-0.60%, Mn: 1.40-1.60%, S is less than or equal to 0.030%, P is less than or equal to 0.030%, V: 0.040-0.060%, the content of O is controlled below 50ppm, and the balance is Fe and inevitable impurities;
the production process adopts the working procedures of converter smelting, LF furnace refining, strong deoxidation, furnace bottom argon blowing and billet continuous casting to smelt steel billets; the billet steel enters a steel rolling heating furnace to be heated; and (3) enabling the hot blank to enter a rough and medium rolling, pre-finish rolling and finish rolling area, adopting a full-line micro-tension technology and a loop precision control technology, performing controlled cooling after rolling, performing heat preservation through a cooling bed heat preservation cover, and finally rolling to obtain the bolt reinforcing steel bar with the screw thread rib with the dense pitch.
2. The hot rolling process method for the steel bar of the dense-pitch threaded rib anchor rod according to the claim 1, wherein the hot rolling process method comprises the following steps: the MG600Z phi 22 dense pitch thread rib anchor rod reinforcing steel bar comprises the following chemical components in percentage by weight: c: 0.25 to 0.30%, Si: 0.40-0.60%, Mn: 1.40-1.60%, S is less than or equal to 0.030%, P is less than or equal to 0.030%, V: 0.040-0.060%, the content of O is controlled below 50ppm, and the balance is Fe and inevitable impurities;
the production process adopts the working procedures of converter smelting, LF furnace refining, strong deoxidation, furnace bottom argon blowing and billet continuous casting to smelt steel billets; the billet steel enters a steel rolling heating furnace to be heated; and (3) the hot blank enters a rough and medium rolling, pre-finish rolling and finish rolling area, the full-line micro-tension technology and the loop precision control technology are adopted, controlled cooling is carried out after rolling, heat preservation is carried out through a cold bed heat preservation cover, and finally the MG600Z phi 22 tight pitch thread rib anchor rod reinforcing steel bar is rolled.
3. The hot rolling process method for the steel bar of the dense-pitch threaded rib anchor rod according to the claim 1, wherein the hot rolling process method comprises the following steps: the initial rolling temperature of the billet is 960-1000 ℃.
4. The hot rolling process method for the steel bar of the bolt with the dense pitch and the threaded rib as claimed in claim 1, wherein the hot rolling process method comprises the following steps: controlling the rolling temperature to be 940-980 ℃.
5. The hot rolling process method for the steel bar of the bolt with the dense pitch and the threaded rib as claimed in claim 1, wherein the hot rolling process method comprises the following steps: the K1-K3 inlet guides and guards all adopt rolling guides and guards.
6. The hot rolling process method for the steel bar of the dense-pitch threaded rib anchor rod according to the claim 1, wherein the hot rolling process method comprises the following steps: the K1 roller connecting shaft adopts a novel crank type phase connecting shaft.
7. The hot rolling process method for the steel bar of the dense-pitch threaded rib anchor rod according to the claim 1, wherein the hot rolling process method comprises the following steps: the pitch of the finished product of the reinforcing steel bar of the dense pitch thread rib anchor rod is controlled to be 4.5 +/-0.15 mm.
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| CN202111610542.7A CN114505341A (en) | 2021-12-27 | 2021-12-27 | Hot rolling process method for reinforcing steel bars of dense-pitch threaded rib anchor rod |
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2021
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| CN112371721A (en) * | 2020-10-19 | 2021-02-19 | 荆州市群力金属制品有限公司 | Production method of hot-rolled ribbed steel bar |
| CN113802056A (en) * | 2021-08-12 | 2021-12-17 | 河钢股份有限公司承德分公司 | HRB600 hot-rolled high-strength coiled steel and production method thereof |
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