CN114717477B - HRB400E general speed hot rolling ribbed steel bar with tensile strength of more than 700MPa - Google Patents
HRB400E general speed hot rolling ribbed steel bar with tensile strength of more than 700MPa Download PDFInfo
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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
- B21B1/163—Rolling or cold-forming of concrete reinforcement bars or wire ; Rolls therefor
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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
- 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
- C21D2211/002—Bainite
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Abstract
The invention provides an HRB400E general hot-rolled ribbed steel bar with tensile strength of more than 700Mpa, which comprises the following components in percentage by weight: c:0.19-0.25%, si:0.60-0.80%, mn: 1.45-1.60%, P is less than or equal to 0.040%, S is less than or equal to 0.035%, V:0.065 to 0.10%, nb: 0.010-0.022%, N:0.008 to 0.020%, B:0.0020 to 0.0050 percent. The invention can improve the tensile strength of HRB400E straight hot-rolled ribbed steel bar with phi of 10-40 mm to over 700Mpa and the tensile ratio R DEG m /R° eL More than or equal to 1.45, and the hot-rolled ribbed steel bar product with better shock resistance than the conventional HRB400E is obtained.
Description
The invention is as follows: application date: 10/6/2021, application No.: 2021106484836, title of the invention: HRB400E general speed hot rolling ribbed steel bar with tensile strength of more than 700Mpa and a production method thereof.
Technical Field
The invention belongs to the field of steel production and manufacturing, and relates to a common HRB400E hot-rolled ribbed steel bar with the tensile strength of more than 700MPa or a common HRB400E hot-rolled ribbed steel bar with the tensile strength of more than 700 MPa.
Background
HRB400E earthquake-resistant steel bars are widely applied due to high strength and good earthquake-resistant performance, GB/T1499.2-2018 part 2 of steel for reinforced concrete: plasticity index (such as maximum force total elongation A) of HRB400E earthquake-resistant steel bar in hot-rolled ribbed steel bar gt (strong yield ratio of R DEG) m /R° eL 、R° eL /R eL And the like) are all clearly required. The tensile strength of the conventional HRB400E earthquake-resistant steel bar is about 600MPa, and the higher the tensile strength is on the premise of meeting the plasticity index in the national standard, the higher the tensile strength is, the larger the tensile force can be borne by the steel bar before the steel bar is broken, and the earthquake-resistant performance is better. The existing HRB400E anti-seismic steel bar with common speed (non-high bar) has lower tensile strength and lower yield ratio.
In summary, the following problems exist in the prior art: the existing ordinary-speed (non-high-bar) HRB400E anti-seismic steel bar has lower tensile strength and lower yield ratio.
Disclosure of Invention
The invention provides an HRB400E common-speed hot-rolled ribbed steel bar with the tensile strength of more than 700Mpa, which aims to solve the problems of lower tensile strength and lower yield ratio of the conventional common-speed (non-high-bar) HRB400E anti-seismic steel bar.
Therefore, the invention provides a production method of HRB400E general speed hot-rolled ribbed steel bar with tensile strength of more than 700MPa, which comprises the following steps:
the following process stages are carried out in sequence: blast furnace molten iron smelting → molten iron desulphurization pretreatment → converter molten steel smelting → LF refining → square billet continuous casting → hot continuous rolling → fixed length shearing;
the outlet speed of a finishing mill group for hot continuous rolling is not more than 18m/S.
The HRB400E plain-speed hot-rolled ribbed steel bar comprises the following components in percentage by weight: c:0.19-0.25%, si:0.60-0.80%, mn: 1.45-1.60%, P is less than or equal to 0.040%, S is less than or equal to 0.035%, V:0.065 to 0.10%, nb: 0.010-0.022%, N: 0.008-0.020%, B:0.0020 to 0.0050 percent; .
Further, in converter molten steel smelting: s is required to be less than or equal to 0.040Wt% when the molten iron enters the furnace; argon is blown from the bottom in the whole process of smelting, the gas flow is increased in the later stage of blowing, and the stirring of a molten pool is enhanced; the end point of the converter is controlled to be less than or equal to 0.15Wt% C and less than or equal to 0.037Wt% P.
And further, in the square billet continuous casting, ladle slag discharge detection control is adopted, the pouring temperature of a tundish is 1525-1545 ℃, and the uniflow casting speed of a casting blank is 2.5-3.5 m/min.
Further, the heating temperature of the casting blank is controlled to be 1150-1200 ℃, the heating time of the billet is controlled to be 60-90 minutes, the initial rolling temperature is controlled to be 1000-1060 ℃, and an 18-frame hot continuous rolling unit is adopted.
Furthermore, for HRB400E general speed hot-rolled ribbed steel bars with the specification of more than 28mm, the cooling bed cooling mode is fan air cooling.
Further, for HRB400E general speed hot rolled ribbed steel bar with the specification of 10-25 mm, the components by weight percentage are as follows: c:0.19-0.25%, si:0.60-0.80%, mn: 1.45-1.60%, P is less than or equal to 0.040%, S is less than or equal to 0.035%, 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 plain speed hot rolled ribbed steel bars with the specification of 28-40 mm, the components by weight percentage are as follows: c:0.19-0.25%, si:0.60-0.80%, mn: 1.45-1.60%, P is less than or equal to 0.040%, S is less than or equal to 0.035%, V:0.08 to 0.10%, nb: 0.010-0.022%, N:0.01 to 0.02%, B:0.0036 to 0.0050 percent.
Furthermore, for HRB400E plain speed hot rolled ribbed steel bars with the specification of 10-16 mm, the finish rolling temperature is 880 +/-20 ℃, and the temperature of an upper cooling bed is 900 +/-20 ℃.
Furthermore, for HRB400E general speed hot rolling ribbed steel bars with the specification of 18-25 mm, the finish rolling temperature is 950 +/-20 ℃, and the temperature of an upper cooling bed is 950 +/-20 ℃.
The invention also provides HRB400E general hot-rolled ribbed steel bar with tensile strength of more than 700MPa,
the HRB400E general speed hot-rolled ribbed steel bar with the tensile strength of more than 700Mpa comprises the following components in percentage by weight: c:0.19-0.25%, si:0.60-0.80%, mn: 1.45-1.60%, P is less than or equal to 0.040%, S is less than or equal to 0.035%, V:0.065 to 0.10%, nb: 0.010-0.022%, N: 0.008-0.020%, B:0.0020 to 0.0050 percent; and adopting the production method of HRB400E general hot rolling ribbed steel bar with tensile strength of more than 700 Mpa.
The invention improves the hardenability of the steel in the component design, enables the CCT curve of the steel to move to the right, refines crystal grains by using controlled rolling and controlled cooling processes when producing small specifications, accelerates cooling when producing large specifications, can generate bainite tissues with reasonable content in the steel, enables the steel bar to be in a non-yield state without reducing plasticity, and ensures that the plasticity index is qualified. Thus, the HRB400E hot-rolled ribbed steel bar with the tensile strength of more than 700MPa and the specification of 10-40 mm can be obtained. The invention can improve the tensile strength of HRB400E straight hot-rolled ribbed steel bar with phi of 10-40 mm to over 700Mpa and the tensile ratio R DEG m /R° eL More than or equal to 1.45, and the hot-rolled ribbed steel bar product with better shock resistance than the conventional HRB400E is obtained.
Detailed Description
The present invention will now be described in order to more clearly understand the technical features, objects, and effects of the present invention.
The method is suitable for common bars, the finish rolling speed is low, and the finish rolling speed (outlet speed of a finishing mill set for hot continuous rolling) is only 1/3-1/2 of that of high-speed bars according to different specifications. Meanwhile, due to the difference of production lines, more alloys are added to achieve the same performance, and the specifications of the produced bars are more than those of high-speed bars.
(1) Designing components: the contents of Si and Mn in the steel are improved, the V element is added to be combined with N in the steel to improve the strength, and the N element in the steel is controlled to be in a reasonable interval, so that most of N is combined with V to reduce free N in the steel. The element B is added, most of N in the steel is combined with V to produce a compound, so that most of B in the steel is in a solid solution state, the element Nb is added into the steel, the combined action of high Mn content, solid solution state B and Nb addition obviously improves the hardenability of the steel, 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 process comprises the following steps: different components and steel rolling production processes are used for 10-40 mm, and bainite structures are easy to form due to the fact that the cooling speed of small specifications on a cooling bed is high, so that the small specifications need to use controlled rolling and controlled cooling processes to refine crystal grains and inhibit the formation of the bainite structures; naturally cooling to form bainite structures; in large specification, a fan or a water cannon is used for accelerating cooling in a cooling bed. The bainite content of the edge part of the cross section of the steel bar structure is controlled to be 0 percent, the bainite content at the 1/4 part is controlled to be 1-10 percent, and the bainite content at the center part of the cross section is controlled to be 5-20 percent.
(3) And (4) checking: because the reinforcing steel bar produced by the process has no yield point, the yield strength is valued according to Rp0.2 during mechanical inspection, and the inspection is carried out after natural or artificial aging, so that the Agt is qualified.
The process route is as follows: smelting blast furnace molten iron, desulfurizing and pretreating the molten iron, smelting converter molten steel, LF refining, continuously casting square billets, continuously rolling, cutting to length, inspecting, packaging and warehousing; wherein, the process characteristics of each stage are as follows:
smelting molten steel in a converter: the S of the molten iron fed into the furnace is required to be less than or equal to 0.040Wt%; argon is blown from the bottom in the whole process of smelting, the gas flow is increased in the later stage of blowing, and the stirring of a molten pool is enhanced; controlling the end point of the converter to be less than or equal to 0.15Wt% C and less than or equal to 0.037Wt% P;
and (3) square billet continuous casting, wherein ladle slag tapping detection control is adopted, the pouring temperature of a tundish is 1525-1545 ℃, the tundish uses a common covering agent and uses common square billet covering slag, and the single flow casting speed of a casting blank is 2.5-3.5 m/min.
Hot continuous rolling of bars: controlling the heating temperature of a casting blank to 1150-1200 ℃, the heating time of a billet to 60-90 minutes, the initial rolling temperature to 1000-1060 ℃, adopting an 18-frame hot continuous rolling unit, and using a cooling control device before finish rolling.
In order to achieve the purpose, the specific technical measures of the invention comprise:
1. reasonable components:
(1) Si and Mn content. Si and Mn play a role in solid solution strengthening, and manganese is dissolved in ferrite and cementite in steel, so that the stability of super-cooled austenite is improved, and the hardenability is improved. Therefore, the contents of Si and Mn are controlled according to the upper limit allowed by the national standard.
(2) V, N and B content. The V element and trace B in the steel compete for N in the steel, and the combination of V and N for producing VN improves the strength of the steel and makes B difficult to combine with N to form BN. B exists on the austenite grain boundary, so that the austenite grain boundary energy is reduced, and the stability of austenite in a temperature range above martensite is improved, so that the hardenability of the steel can be obviously improved by a trace amount of B.
(3) And (4) Nb element. The trace amount of niobium dissolved in austenite delays the precipitation of pro-eutectoid ferrite and increases the time for the austenite to start decomposing and precipitating pearlite, but it hardly affects the transformation of bainite, and increases the transformation temperature of bainite, which is an advantageous element for forming bainite, so that Nb is added to control the bainite structure, and forms carbonitride to increase the strength. The compositions of the present invention are as shown in Table 1
TABLE 1HRB400E composition (wt%)
2. And (5) rolling. Different components and steel rolling production processes are used for 10-40 mm, and due to the fact that the cooling speed of the small-size steel bar on a cooling bed is high, excessive bainite structures are easily formed, the plasticity index of the steel bar is not suitable, so that the small-size steel bar needs to use controlled rolling and controlled cooling processes to refine grains, and the formation of the bainite structures is inhibited; the cooling speed of the medium specification on a cooling bed is in the middle, and the bainite structure is controlled in a reasonable range by proper controlled rolling and controlled cooling processes; the cooling speed of large-size steel plates on a cooling bed is low, bainite structures are not easy to form, controlled rolling and controlled cooling processes are not used, and a fan is used for accelerating cooling on the cooling bed. The bainite content of the edge part of the cross section of the steel bar structure is controlled to be 0 percent, the bainite content at the 1/4 part is controlled to be 1-10 percent, and the bainite content at the center part of the cross section is controlled to be 5-20 percent. The relevant rolling parameters are shown in Table 2
TABLE 2 Rolling parameter table
| Specification of | Finish rolling temperature | Upper cooling bed temperature | Cooling mode of cooling bed |
| Phi 10-16 spiro | 880±20℃ | 900±20℃ | Natural cooling |
| Phi 18-25 spiro | 950±20℃ | 950±20℃ | Natural cooling |
| Phi 28-40 spiro | Do not do itControl of | 980±20℃ | Air cooling by using fan |
3. And (3) testing: because the steel bar produced by the process contains a certain amount of bainite structures, and a mechanical curve has no yield platform, the lower yield strength characteristic value ReL is taken according to Rp0.2 during mechanical inspection, and meanwhile, inspection is carried out after 5-day natural aging or artificial aging, so that the Agt can be guaranteed to be qualified.
The artificial aging operation comprises the following steps: preserving heat at 150 + -10 deg.C for no less than 30min, naturally cooling, and inspecting.
The technical characteristics of the invention include:
1. reasonable components: the contents of Si and Mn in the steel are improved, the V element is added to be combined with N in the steel to improve the strength, and the N element in the steel is controlled in a reasonable interval, so that most of N is combined with V to reduce free N in the steel. The element B is added, most of N in the steel is combined with V to produce compounds, so that most of B in the steel is in a free state, the element Nb is added into the steel, the combined action of high Mn content, free B and Nb is used for obviously improving the hardenability of the steel, 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 process comprises the following steps: different components and steel rolling production processes are used for 10-40 mm, the bainite content of the edge part of the cross section of the steel bar structure is controlled to be 0%, the bainite content of the 1/4 part is controlled to be 1-10%, and the bainite content of the center part of the cross section is controlled to be 5-20%.
3. And (4) checking: because the reinforcing steel bar produced by the process has no yield point, the yield strength is valued according to Rp0.2 during mechanical inspection, and the inspection is carried out after natural or artificial aging, so that the Agt is qualified.
The invention 'HRB 400E hot-rolled ribbed steel bar with phi 10-40 mm and tensile strength of more than 700 Mpa' adopts the following component proportions and specific processes. Wherein, table 3 is the composition (in weight percent) of the steels of the respective examples. 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%) of product
| Examples of the invention | C | Si | Mn | P | S | V | Nb | N | B |
| Example 1 | 0.23 | 0.67 | 1.50 | 0.031 | 0.023 | 0.072 | 0.017 | 0.0110 | 0.0030 |
| Example 2 | 0.22 | 0.68 | 1.53 | 0.022 | 0.025 | 0.073 | 0.018 | 0.0098 | 0.0028 |
| Example 3 | 0.25 | 0.70 | 1.55 | 0.020 | 0.022 | 0.089 | 0.015 | 0.0135 | 0.0039 |
| Example 4 | 0.20 | 0.72 | 1.52 | 0.027 | 0.030 | 0.091 | 0.017 | 0.0117 | 0.0046 |
Table 4: specific process parameters and mechanical properties of the examples
By applying the invention, the tensile strength of HRB400E straight hot-rolled ribbed steel bars with the specification of phi 10-40 mm can be improved to more than 700Mpa, the yield ratio R DEG m/R DEG eL is more than or equal to 1.45, and the hot-rolled ribbed steel bar product with better shock resistance than the conventional HRB400E is obtained.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. In order that the components of the present invention may be combined without conflict, it is intended that all equivalent changes and modifications made by those skilled in the art without departing from the spirit and principles of the present invention shall fall within the protection scope of the present invention.
Claims (9)
1. An HRB400E general speed hot rolling ribbed steel bar with tensile strength of more than 700MPa, which is characterized in that,
the HRB400E general speed hot-rolled ribbed steel bar with the tensile strength of more than 700MPa comprises the following components in percentage by weight: c:0.19-0.25%, si:0.60-0.80%, mn: 1.45-1.60%, P is less than or equal to 0.040%, S is less than or equal to 0.035%, V:0.065 to 0.10%, nb:0.017 to 0.018%, N:0.008 to 0.020%, B:0.0020 to 0.0050%;
and adopting a production method of HRB400E general speed hot rolling ribbed steel bars with the tensile strength of more than 700 MPa;
the production method of the HRB400E normal speed hot-rolled ribbed steel bar with the tensile strength of more than 700MPa comprises the following steps:
the following process stages are carried out in sequence: smelting blast furnace molten iron, desulfurizing and pretreating the molten iron, smelting converter molten steel, LF refining, continuously casting square billets, continuously rolling and cutting to length;
the outlet speed of a finishing mill group for hot continuous rolling is not more than 18m/s;
before finish rolling, cooling control equipment is used;
for HRB400E general speed hot rolling ribbed steel bars with the specification of 10-16 mm, the precision rolling temperature is 880 +/-20 ℃, and the temperature of an upper cooling bed is 900 +/-20 ℃;
controlling the bainite content at the edge of the cross section of the steel bar structure to be 0%, the bainite content at 1/4 position to be 1 to 10%, and the bainite content at the center of the cross section to be 5 to 20%;
the specification is phi 12mm, and the cooling bed cooling mode is as follows: naturally cooling; ratio of yield to strengthR° m / R° eL Is 1.59;
for HRB400E general-speed hot-rolled ribbed steel bars with the specification of more than 28mm, the cooling bed cooling mode is to use a fan for air cooling; specification of phi 40mm, high yield ratioR° m / R° eL It was 1.59.
2. The HRB400E normal hot-rolled ribbed steel bar with the tensile strength of more than 700MPa according to claim 1, wherein the HRB400E normal hot-rolled ribbed steel bar with the tensile strength of more than 700MPa comprises the following components in percentage by weight: c:0.23%, si:0.67%, mn:1.50%, P:0.031%, S:0.023%, V:0.072%, nb:0.017%, N:0.010%, B:0.0030%.
3. The HRB400E normal hot-rolled ribbed steel bar with the tensile strength of more than 700MPa according to claim 1, wherein the HRB400E normal hot-rolled ribbed steel bar with the tensile strength of more than 700MPa comprises the following components in percentage by weight: c:0.22%, si:0.68%, mn:1.53%, P:0.022%, S:0.025%, V:0.073%, nb:0.018%, N:0.0098%, B:0.0028%.
4. The HRB400E normal hot-rolled ribbed steel bar with the tensile strength of more than 700MPa according to claim 1, wherein the HRB400E normal hot-rolled ribbed steel bar with the tensile strength of more than 700MPa comprises the following components in percentage by weight: c:0.20%, si:0.72%, mn:1.52%, P:0.027%, S:0.030%, V:0.091%, nb:0.017%, N:0.0117%, B:0.0046 percent.
5. The HRB400E normal hot-rolled ribbed bar with the tensile strength of more than 700MPa according to claim 1, wherein the specification is phi 10 to 40mm.
6. The HRB400E plain hot rolled ribbed bar having a tensile strength of 700MPa or greater according to claim 1 wherein the gauge is Φ 12mm.
7. The HRB400E plain hot rolled ribbed bar having a tensile strength of 700MPa or greater according to claim 1 wherein the gauge is Φ 22mm.
8. The HRB400E plain hot rolled ribbed bar having a tensile strength of above 700MPa according to claim 1 wherein the gauge is Φ 28mm.
9. The HRB400E plain hot rolled ribbed bar having a tensile strength of above 700MPa according to claim 1 wherein the gauge is Φ 40mm.
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| CN115141975B (en) * | 2021-11-05 | 2023-02-07 | 柳州钢铁股份有限公司 | Hot-rolled steel bar with stable aging performance |
| CN114196876B (en) * | 2021-11-05 | 2022-06-24 | 柳州钢铁股份有限公司 | High-safety hot-rolled steel bar and production method thereof |
| 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 |
| CN116103576B (en) * | 2023-02-21 | 2024-05-24 | 北京科技大学 | Hot rolled ribbed straight bar with yield strength of 500MPa and manufacturing method thereof |
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