CN116254469A - HRB500E common hot rolled ribbed steel bar with strength-to-bending ratio greater than 1.28 - Google Patents
HRB500E common hot rolled ribbed steel bar with strength-to-bending ratio greater than 1.28 Download PDFInfo
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- CN116254469A CN116254469A CN202310094718.0A CN202310094718A CN116254469A CN 116254469 A CN116254469 A CN 116254469A CN 202310094718 A CN202310094718 A CN 202310094718A CN 116254469 A CN116254469 A CN 116254469A
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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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- 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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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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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- 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
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- 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
- C21D2211/002—Bainite
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- 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
Abstract
The invention provides an HRB500E common hot rolled ribbed steel bar with a strong bending ratio greater than 1.28, which comprises the following components in percentage by weight: c:0.19-0.25%, si:0.60-0.80%, mn:1.45 to 1.60 percent, P is less than or equal to 0.040 percent, S is less than or equal to 0.035 percent, V: 0.065-0.10%, nb: 0.010-0.022%, N:0.008 to 0.020 percent, B:0.0020 to 0.0050 percent; the standard of the common hot rolled ribbed steel bar is as follows: 10mm to 40mm. The bainite content at the edge of the cross section of the reinforcing steel bar structure is controlled to be 0%, the bainite content at 1/4 part is controlled to be 0%, and the bainite content at the center of the cross section is controlled to be 1-10%.
Description
The invention is applied separately, and the mother case: filing date: 2021, 6 and 10 days, application number: 2021106469018, name of invention: HRB500E general hot rolled ribbed steel bar with a strength to flex ratio greater than 1.28 and a production method thereof.
Technical Field
The invention relates to the field of metallurgy, in particular to an HRB500E common hot-rolled ribbed steel bar with a strong-bending ratio greater than 1.28.
Background
HRB500E anti-seismic steel bar has high strength, good anti-seismic performance and wide application, and GB/T1499.2-2018 part 2 of steel for reinforced concrete: the strength-to-deflection ratio R degree of HRB500E anti-seismic steel bar in hot rolled ribbed steel bar m /R° eL The strength-to-deflection ratio R DEG is required to be 1.25 or more, but is often found in normal production m /R° eL Below 1.25.
In summary, the following problems exist in the prior art: production of HRB500E anti-seismic steel bars rolled at ordinary speed often causes the yield ratio R DEG m /R° eL Below 1.25.
Disclosure of Invention
The invention provides an HRB500E ordinary hot rolled ribbed steel bar with a strong bending ratio greater than 1.28 and a production method thereof, which aims to solve the problem that the strong bending ratio R degree frequently occurs in the production of an HRB500E anti-seismic steel bar rolled at ordinary speed m /R° eL Problems below 1.25.
Therefore, the invention provides a production method of HRB500E common hot rolled ribbed steel bar with a strong buckling ratio greater than 1.28, which comprises the following steps:
the following process stages are sequentially carried out: blast furnace molten iron smelting, molten iron desulfurization pretreatment, converter molten steel smelting, LF refining, square billet continuous casting and hot continuous rolling;
the outlet speed of the finishing mill group for hot continuous rolling is not more than 18m/S.
The HRB500E common hot rolled ribbed steel bar comprises the following components in percentage by weight: c:0.19-0.25%, si:0.60-0.80%, mn:1.45 to 1.60 percent, P is less than or equal to 0.040 percent, S is less than or equal to 0.035 percent, V: 0.065-0.10%, nb: 0.010-0.022%, N:0.008 to 0.020 percent, B:0.0020 to 0.0050 percent;
the standard of the common hot rolled ribbed steel bar is as follows: 10mm to 40mm
The cooling mode of the cooling bed is natural cooling.
In finish rolling of hot continuous rolling, the deformation of the last two frame passes is more than 16%.
Further, in hot continuous rolling: the heating temperature of the casting blank is controlled to 1150-1200 ℃, the heating time of the steel billet is controlled to 60-90 minutes, the initial rolling temperature is controlled to 1020-1080 ℃, an 18-frame hot continuous rolling unit is adopted, and cooling control equipment is arranged and used before finish rolling, before final two frames of finish rolling and after finish rolling.
Further, for HRB400E common hot rolled ribbed steel bars with the specification of 10 to 25mm, the components in percentage by weight are: c:0.19-0.25%, si:0.60-0.80%, mn:1.45 to 1.60 percent, P is less than or equal to 0.040 percent, S is less than or equal to 0.035 percent, V: 0.065-0.085%, nb: 0.010-0.022%, N: 0.008-0.017%, B:0.0020 to 0.0035 percent.
Further, for HRB400E common hot rolled ribbed steel bars with the specification of 28 to 40mm, the components in percentage by weight are: c:0.19-0.25%, si:0.60-0.80%, mn:1.45 to 1.60 percent, P is less than or equal to 0.040 percent, S is less than or equal to 0.035 percent, V:0.08 to 0.10 percent, nb: 0.010-0.022%, N:0.01 to 0.02 percent, B:0.0036 to 0.0050 percent.
Further, for HRB500E ordinary hot rolled ribbed bars having a gauge of 10 to 16mm, the finishing rolling temperature was 950±20 ℃, the penultimate finishing rolling temperature was 850±20 ℃, and the upper cooling bed temperature was 850±20 ℃.
Further, for HRB500E ordinary hot rolled ribbed bars having a gauge of 18 to 25mm, the finishing rolling temperature was 950±20 ℃, the penultimate finishing rolling temperature was 880±20 ℃, and the upper cooling bed temperature was 880±20 ℃.
Further, for HRB500E ordinary hot rolled ribbed bars of 28 to 40mm gauge, the finishing rolling temperature was 950±20 ℃, the penultimate finishing rolling temperature was 900±20 ℃, and the upper cooling bed temperature was 880±20 ℃.
Further, for HRB500E plain hot rolled ribbed bars of 12mm gauge, the finishing rolling temperature was 952 ℃, and the cooling bed temperature was 845 ℃.
The invention also provides an HRB500E common hot rolled ribbed steel bar with a strong bending ratio greater than 1.28, wherein the HRB500E common hot rolled ribbed steel bar comprises the following components in percentage by weight: c:0.19-0.25%, si:0.60-0.80%, mn:1.45 to 1.60 percent, P is less than or equal to 0.040 percent, S is less than or equal to 0.035 percent, V: 0.065-0.10%, nb: 0.010-0.022%, N:0.008 to 0.020 percent, B:0.0020 to 0.0050 percent;
and the production method of the HRB500E ordinary hot rolled ribbed steel bar with the strength-to-bend ratio larger than 1.28 is adopted.
Further, for HRB600E plain hot rolled ribbed steel bars of 28mm gauge, the composition is: c:0.21%, si:0.72%, mn:1.52%, P:0.030%, S:0.031%, V:0.090%, nb:0.014%, N:0.0167%, B:0.0040%; the ratio of the strong to the soft is greater than 1.30.
The invention can improve the strength-to-deflection ratio of the HRB500E hot rolled ribbed steel bar with the specification of phi 10-40 mm to more than 1.28.
Detailed Description
The present invention will now be described for a clearer understanding of technical features, objects, and effects of the present invention.
The method is suitable for common bars, the finishing speed is low, and according to different specifications, the finishing speed (outlet speed of a finishing mill group for hot continuous rolling) is only 1/3-1/2 of that of the high-speed bars. Meanwhile, due to different production lines, more alloys are added to achieve the same performance, and the produced high-speed bars have more specifications.
The principle of the invention is as follows: the component design improves the hardenability of the steel to enable the CCT curve of the steel to move right, and the controlled rolling and cooling process is used for refining grains in the steel rolling process to control the generation of bainite structure. And when the steel bar is produced in a small specification, a stronger rolling and cooling control process is used, and when the steel bar is produced in a large specification, a weaker rolling and cooling control process is used, so that the center part of the steel bar is controlled to generate a bainite structure with reasonable content. The small amount of bainite structure in the center of the steel bar will not cause no yield phenomenon, and this can reduce yield strength properly and raise tensile strength, so as to obtain high strength-to-yield ratio R/R deg. eL. Thus, the HRB500E hot rolled ribbed steel bar with the specification of 10-40 mm and the strength-to-deflection ratio R degree m/R degree eL of more than 1.28 can be obtained.
(1) And (3) component design: the Si and Mn contents in the steel are improved, the V element is added to combine with the N in the steel, the yield strength and the tensile strength are improved, the N element in the steel is controlled in a reasonable section, most of N is combined with the V, and the free N in the steel is reduced. The B element is added, and most of N in the steel is combined with V to produce a compound, so that B in the steel is mostly in a solid solution state, nb element is added in the steel, and the quenching property of the steel is obviously improved under the combined action of high Mn content, solid solution state B and Nb addition, so that the CCT curve of the steel is shifted to the right, and a bainite structure can be produced under the same cooling condition.
(2) The rolling mill arrangement: the roughing mill is 6, the rolling mill is 6, the controlled cooling is 4, the finishing mill is 4, the controlled cooling is 2, the finishing mill is 2, the controlled cooling is 2, and the cooling is 2. And the cooling intensity is controlled in a grading way, so that the surface supercooling caused by concentrated cooling is avoided.
(3) Rolling process and tissue control: different components and steel rolling production processes are used for 10-40 mm, and the small size has high cooling speed on a cooling bed and is easy to form a bainite structure, so that the small size should refine grains by using a stronger controlled rolling and cooling process to inhibit the formation of the bainite structure; the medium or above specification uses a weaker controlled rolling and cooling process to control the formation of bainitic structures. The bainite content at the edge of the cross section of the reinforcing steel bar structure is controlled to be 0%, the bainite content at 1/4 part is controlled to be 0%, and the bainite content at the center of the cross section is controlled to be 1-10%.
The process route is as follows: blast furnace molten iron smelting, molten iron desulfurization pretreatment, converter molten steel smelting, LF refining, billet continuous casting, hot continuous rolling, fixed-length shearing, inspection, packaging and warehousing; wherein, the technological characteristics of each stage are:
smelting converter molten steel: the requirement S of molten iron entering the furnace is less than or equal to 0.040wt%; argon is blown at the bottom in the whole smelting process, the gas flow is increased in the later period of blowing, and the stirring of a molten pool is enhanced; the converter end point control C is less than or equal to 0.15wt% and P is less than or equal to 0.037wt%;
and (3) billet continuous casting, namely adopting ladle slag tapping detection control, wherein the pouring temperature of a tundish is 1525-1545 ℃, a common covering agent is used for the tundish, a common billet covering slag is used for the tundish, and the single-flow drawing speed of a casting blank is 2.5-3.5 m/min.
Hot continuous rolling of bars: the heating temperature of the casting blank is controlled to 1150-1200 ℃, the heating time of the steel billet is controlled to 60-90 minutes, the initial rolling temperature is controlled to 1020-1080 ℃, an 18-frame hot continuous rolling unit is adopted, and cooling control equipment is arranged before finish rolling, before finish rolling and after finish rolling.
In order to achieve the above purpose, the specific technical measures of the invention include:
1. reasonable components:
(1) Si, mn content. Si and Mn play a solid solution strengthening role, and manganese is dissolved in ferrite and cementite in steel, so that stability of supercooled austenite is improved, and hardenability is improved. Therefore, the Si and Mn content is controlled according to the upper limit allowed by national standard.
(2) V, N, B content. The V element and the trace amount of B in the steel compete for N in the steel, the combination of V and N produces VN to improve the strength of the steel, and the B is difficult to combine with N to form BN. B exists on the grain boundary of austenite, reduces the energy of the austenite grain boundary, and improves the stability of the austenite in a temperature range above martensite, so that the hardenability of steel can be obviously improved by a trace amount of B.
(3) Nb element. The trace niobium dissolved in the austenite can delay the precipitation of the proeutectoid ferrite, increase the time for the austenite to start to decompose and precipitate pearlite, but has little influence on the transformation of the bainite, and increase the transformation temperature of the bainite, is an advantageous element for forming the bainite, so that the Nb is added to control the bainitic structure and form carbonitride to improve the strength. Table 1 shows the composition design table of the present invention
TABLE 1HRB500E component (wt%)
2. The rolling mill arrangement: 6 roughing mills+6 middle mills+controlled cooling+4 finishing mills+controlled cooling devices+recovery sections+2 finishing mills+controlled cooling devices+recovery sections+cooling beds. Because the rolling speed of the rod and the wire rod is high, the temperature rising rolling is adopted, so that the cooling intensity is controlled in a grading way, and the surface supercooling caused by concentrated cooling is avoided by controlling in three sections.
3. Rolling process and tissue control: different components and steel rolling production processes are used for 10-40 mm, and the small size has high cooling speed on a cooling bed and is easy to form a bainite structure, so that the small size should refine grains by using a stronger controlled rolling and cooling process to inhibit the formation of the bainite structure; the formation of bainite structure is controlled by using weaker controlled rolling and controlled cooling technology in the specification above the medium, and the larger the specification is, the weaker the controlled rolling and controlled cooling strength is. The bainite content at the edge of the cross section of the reinforcing steel bar structure is controlled to be 0%, the bainite content at 1/4 part is controlled to be 0%, and the bainite content at the center of the cross section is controlled to be 1-10%.
4. The pass deformation of the last two frames (K1, K2) of each specification is more than 16%.
The relevant rolling parameters are shown in table 2:
table 2 related Rolling parameter Table
| Specification of specification | Temperature of finish rolling | Temperature of K2 | Upper cooling bed temperature | Cooling mode of cooling bed |
| Phi 10-16 screw | 950±20℃ | 850±20℃ | 850±20℃ | Natural cooling |
| Phi 18-25 screw | 950±20℃ | 880±20℃ | 880±20℃ | Natural cooling |
| Phi 28-40 screw | 950±20℃ | 900±20℃ | 900±20℃ | Natural cooling |
The invention has the technical characteristics that:
1. and (3) component design: the Si and Mn contents in the steel are improved, the V element is added to combine with the N in the steel, the yield strength and the tensile strength are improved, the N element in the steel is controlled in a reasonable section, most of N is combined with the V, and the free N in the steel is reduced. The B element is added, and most of N in the steel is combined with V to produce a compound, so that B in the steel is mostly in a solid solution state, nb element is added in the steel, and the quenching property of the steel is obviously improved under the combined action of high Mn content, solid solution state B and Nb addition, so that the CCT curve of the steel is shifted to the right, and a bainite structure can be produced under the same cooling condition.
2. The rolling mill arrangement: the roughing mill is 6, the rolling mill is 6, the controlled cooling is 4, the finishing mill is 4, the controlled cooling is 2, the finishing mill is 2, the controlled cooling is 2, and the cooling is 2. And the cooling intensity is controlled in a grading way, so that the surface supercooling caused by concentrated cooling is avoided.
3. Rolling process and tissue control: different components and steel rolling production processes are used for 10-40 mm, and the small size has high cooling speed on a cooling bed and is easy to form a bainite structure, so that the small size should refine grains by using a stronger controlled rolling and cooling process to inhibit the formation of the bainite structure; the medium or above specification uses a weaker controlled rolling and cooling process to control the formation of bainitic structures. The bainite content at the edge of the cross section of the reinforcing steel bar structure is controlled to be 0%, the bainite content at 1/4 part is controlled to be 0%, and the bainite content at the center of the cross section is controlled to be 1-10%.
4. The pass deformation of the last two frames (K1, K2) of each specification is more than 16%.
The following is the following composition proportion and specific process. Wherein, table 3 is the composition (in weight%) of each example steel. Table 4 shows the production specifications, process parameters and mechanical properties corresponding to the example steels described in table 3.
Table 3: chemical composition (wt%)
Table 4: specific technological parameters and mechanical properties of each embodiment
The invention can improve the strength-to-deflection ratio of the HRB500E hot rolled ribbed steel bar with the specification of phi 10-40 mm to more than 1.28.
The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention. In order that the components of the invention may be combined without conflict, any person skilled in the art shall make equivalent changes and modifications without departing from the spirit and principles of the invention.
Claims (10)
1. The HRB500E common hot rolled ribbed steel bar with the strength-to-bend ratio being more than 1.28 is characterized by comprising the following components in percentage by weight: c:0.19-0.25%, si:0.60-0.80%, mn:1.45 to 1.60 percent, P is less than or equal to 0.040 percent, S is less than or equal to 0.035 percent, V: 0.065-0.10%, nb: 0.010-0.022%, N:0.008 to 0.020 percent, B:0.0020 to 0.0050 percent;
and adopts the production method of HRB500E common hot rolled ribbed steel bar with the strength-to-bend ratio larger than 1.28;
the production method of the HRB500E common hot rolled ribbed steel bar with the strength-to-flexibility ratio being more than 1.28 comprises the following steps:
the following process stages are sequentially carried out: blast furnace molten iron smelting, molten iron desulfurization pretreatment, converter molten steel smelting, LF refining, square billet continuous casting and hot continuous rolling;
the outlet speed of the finishing mill group for hot continuous rolling is not more than 18m/S;
the standard of the common hot rolled ribbed steel bar is as follows: 10mm to 40mm;
the bainite content at the edge of the cross section of the reinforcing steel bar structure is controlled to be 0%, the bainite content at 1/4 part is controlled to be 0%, and the bainite content at the center of the cross section is controlled to be 1-10%.
2. The HRB500E ordinary speed hot rolled ribbed bar having a ratio of greater than 1.28 as recited in claim 2 wherein the HRB500E hot rolled ribbed bar having a gauge of Φ10-40 mm has a ratio of greater than 1.30.
3. The HRB500E ordinary hot rolled ribbed steel bar having a strength to flex ratio greater than 1.28 as recited in claim 1, wherein the HRB500E ordinary hot rolled ribbed steel bar having a gauge of 10 to 25mm comprises, by weight: c:0.19-0.25%, si:0.60-0.80%, mn:1.45 to 1.60 percent, P is less than or equal to 0.040 percent, S is less than or equal to 0.035 percent, V: 0.065-0.085%, nb: 0.010-0.022%, N: 0.008-0.017%, B:0.0020 to 0.0035 percent.
4. The method for producing HRB500E ordinary hot rolled ribbed steel bar having a strength to flex ratio greater than 1.28 as recited in claim 1, wherein the HRB500E ordinary hot rolled ribbed steel bar having a gauge of 28 to 40mm comprises the following components in weight percent: c:0.19-0.25%, si:0.60-0.80%, mn:1.45 to 1.60 percent, P is less than or equal to 0.040 percent, S is less than or equal to 0.035 percent, V:0.08 to 0.10 percent, nb: 0.010-0.022%, N:0.01 to 0.02 percent, B:0.0036 to 0.0050 percent.
5. The HRB500E plain hot rolled ribbed steel bar having a strength to flex ratio greater than 1.28 as recited in claim 1, wherein for a HRB500E plain hot rolled ribbed steel bar having a gauge of 28mm, the composition is: c:0.21%, si:0.72%, mn:1.52%, P:0.030%, S:0.031%, V:0.090%, nb:0.014%, N:0.0167%, B:0.0040%; the ratio of the strong to the soft is greater than 1.30.
6. The HRB500E plain hot rolled ribbed steel bar having a yield ratio greater than 1.28 as defined in claim 1 wherein the final two frame passes in finish rolling of hot continuous rolling are greater than 16%.
7. The HRB500E plain hot rolled ribbed steel bar having a strength to flex ratio greater than 1.28 of claim 1, wherein the HRB500E plain hot rolled ribbed steel bar comprises the following components: c:0.24%, si:0.71%, mn:1.51%, P:0.033%, S:0.027%, V:0.071%, nb:0.015%, N:0.0130%, B:0.0025%.
8. The HRB500E plain hot rolled ribbed steel bar having a strength to flex ratio greater than 1.28 of claim 1, wherein the HRB500E plain hot rolled ribbed steel bar comprises the following components: c:0.23%, si:0.69%, mn:1.48%, P:0.024%, S:0.028%, V:0.070%, nb:0.013%, N:0.0158%, B:0.0027%.
9. The HRB500E plain hot rolled ribbed steel bar having a strength to flex ratio greater than 1.28 of claim 1, wherein the HRB500E plain hot rolled ribbed steel bar comprises the following components: c:0.25%, si:0.70%, mn:1.50%, P:0.028%, S:0.025%, V:0.093%, nb:0.016%, N:0.0161%, B:0.0045%.
10. The HRB500E plain hot rolled ribbed steel bar having a strength to flex ratio greater than 1.28 of claim 7, wherein the HRB500E plain hot rolled ribbed steel bar has a gauge of 12mm and a strength to flex ratio of 1.32.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310094718.0A CN116254469A (en) | 2021-06-10 | 2021-06-10 | HRB500E common hot rolled ribbed steel bar with strength-to-bending ratio greater than 1.28 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310094718.0A CN116254469A (en) | 2021-06-10 | 2021-06-10 | HRB500E common hot rolled ribbed steel bar with strength-to-bending ratio greater than 1.28 |
| CN202110646901.8A CN113441545B (en) | 2021-06-10 | 2021-06-10 | HRB500E plain-speed hot-rolled ribbed steel bar with strength-to-yield ratio of more than 1.28 and production method thereof |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110646901.8A Division CN113441545B (en) | 2021-06-10 | 2021-06-10 | HRB500E plain-speed hot-rolled ribbed steel bar with strength-to-yield ratio of more than 1.28 and production method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116254469A true CN116254469A (en) | 2023-06-13 |
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| CN114472550B (en) * | 2022-01-04 | 2024-02-13 | 柳州钢铁股份有限公司 | Quality control method of HRB500E hot rolled ribbed steel bar |
| CN114799095B (en) * | 2022-04-28 | 2023-12-29 | 广西柳州钢铁集团有限公司 | Reinforcement bar heating-free direct rolling method and reinforcement bar rolled by heating-free direct rolling method |
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| CN103981446B (en) * | 2014-03-26 | 2016-03-09 | 江苏省沙钢钢铁研究院有限公司 | A kind of bainite type 700MPa level Twisted Steel and production method thereof |
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