CN115181904B - High-safety hot-rolled steel bar - Google Patents
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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
- 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
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- 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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- 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
- C21D2211/008—Martensite
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Abstract
The invention provides a high-safety hot-rolled steel bar, which comprises the following components in percentage by mass: c:0.21 to 0.25Wt%, si: 0.40-0.60 Wt%, mn: 1.35-1.50 Wt%, V: 0.025-0.035 Wt%, N: 0.0070-0.0100 Wt%, B: 0.0012-0.0025 Wt percent and P, S are not more than 0.040 percent; the balance of Fe; the rolling specification is phi 12-phi 22mm. The invention solves the problem of larger potential safety hazard caused by performance fluctuation in the using process of the reinforcing steel bar.
Description
The invention is a divisional application, a mother case: application No.: 2021113077942, filing date: 11/5/2021, invention name: high-safety hot-rolled steel bar and its production method.
Technical Field
The invention relates to the field of steel rolling, in particular to a high-safety hot-rolled steel bar.
Background
The hot rolled steel bar is produced according to GB/T1499.1 or GB/T1499.2 standard, different grades or strength grades, different processes are adopted for steel bar production, and microalloying, controlled rolling and controlled cooling or both processes are adopted, however, the steel bar faces the same problem no matter what process is adopted, namely after the steel bar is naturally aged, the yield strength is reduced to a certain extent, and the reduction range is generally 10-30 Mpa.
The change of the performance of the steel bar after natural aging and the reduction of the yield strength after aging are caused by the formation of the residual stress of the steel bar and the subsequent aging change. The residual stress is the internal stress of the steel bar, the generation factors of the residual stress mainly comprise uneven mechanical deformation, uneven temperature change and uneven phase change, most of the current hot rolled steel bars deform at the temperature above an austenite recrystallization zone, B or M transformation does not occur, the structure is F + P, and the residual stress of the steel bars is mainly the temperature stress after production is finished: the surface of the steel bar is cooled faster than the core, and after the steel bar is cooled to normal temperature, the surface of the steel bar generates compressive stress and the core is tensile stress. The steel bar is sampled immediately after production and is subjected to factory inspection, the tensile load of the tensile test at the moment is transmitted to the whole section of the steel bar from the clamp through the surface of the steel bar, and the direction of the load is opposite to the residual stress of the surface of the steel bar, so that the steel bar is required to yield, the surface compressive stress of the steel bar is required to be overcome besides the yield limit of the material, the yield strength of the obtained steel bar is superposed with the residual stress of the steel bar instead of the real yield strength of the material, and the stress is relaxed due to the natural aging, alternating temperature change and micro-strain of the steel bar in the subsequent use process, so that the residual stress is continuously reduced, and the yield of the steel bar is also reduced. For example, fig. 1 shows that the current steel bar undergoes the change of natural aging yield strength, the real service strength of the aged steel bar is lower than the standard lower limit value of 400MPa, and the strength reduction amplitude is 25MPa.
The method can be used for sample treatment before steel bar delivery inspection, but because time and equipment need to be added, no manufacturer uses the method for delivery inspection at present, so that the performance of the steel bar subjected to delivery inspection has larger deviation with the actual service performance and the real performance after long-time aging of the steel bar, and the potential safety hazard of the use of the steel bar still exists.
In summary, the following problems exist in the prior art: the factory performance of the steel bars and the actual performance of the steel bars in service have larger deviation, so that the steel bars have larger potential safety hazard in the using process.
Disclosure of Invention
The invention provides a production method of a high-safety hot-rolled steel bar, which aims to solve the problem of great potential safety hazard in the using process of the steel bar caused by great deviation between the delivery performance of the steel bar and the actual performance of the steel bar in service.
Therefore, the invention provides a production method of a high-safety hot-rolled steel bar, which comprises the following steps:
the steel bar comprises the following components in percentage by mass: c:0.21 to 0.25Wt%, si: 0.40-0.60 Wt%, mn: 1.35-1.50 Wt%, V: 0.025-0.035 Wt%, N: 0.0070-0.0100 Wt%, B: 0.0012-0.0025 Wt%, P, S is not more than 0.040; the balance of Fe;
the rolling specification is phi 12-phi 22mm;
the production method comprises the following steps: converter steelmaking, square billet continuous casting, heating, continuous rolling, cooling after rolling and natural cooling of a cooling bed;
heating with a stepping continuous heating furnace at 1150-1180 deg.C in soaking section for 68-75min;
the difference value of the yield value Rel of the hot rolled steel bar in the natural aging process and the factory mechanical property test is within +/-10 MPa.
Further, the specification of phi 20mm adopts a two-cutting process.
Further, the specification of phi 12mm adopts a four-segmentation process.
Furthermore, the rolling speed of the finished product rack is 11-15 m/s.
Furthermore, cooling by passing water after rolling, wherein the temperature of the upper cooling bed is 920-955 ℃.
Further, the initial rolling temperature is 1030-1050 ℃.
Further, the steel is naturally cooled after being put on a cooling bed.
The invention also provides a high-safety hot-rolled steel bar, which comprises the following components in percentage by mass: c:0.21 to 0.25Wt%, si: 0.40-0.60 Wt%, mn: 1.35-1.50 Wt%, V: 0.025-0.035 Wt%, N: 0.0070-0.0100 Wt%, B: 0.0012-0.0025 Wt percent and P, S are not more than 0.040 percent; the balance of Fe; the balance of Fe and inevitable impurities; the rolling specification is phi 12-phi 22mm.
Further, the rolling specification of the hot-rolled steel bar is phi 12 or phi 20mm.
Furthermore, the hot-rolled steel bars are HRB400E hot-rolled steel bars, and the content of B + M in the core structure of the finished steel bars is 2-6%.
Furthermore, the hot rolled steel bar is HRB400E hot rolled steel bar, and the difference between the natural aging of the hot rolled steel bar and the factory mechanical property test yield value Rel is within +/-10 MPa.
The invention adds V, B (boron), increases Mn content and other alloying means capable of delaying ferrite phase transformation, assists with rolling process matched with components, controls casting blank drawing speed, heating temperature, rolling speed, cooling temperature and cooling speed to control bainite content or B + M content in a steel bar core part to be 2-6%, the rest structure is F + P, structural stress and temperature stress generated by core bainite or martensite reach balance and cancel each other out, the steel bar obtained by the method has extremely low residual stress, through natural aging, the yield strength change amplitude of the steel bar is very small, and the yield value R is tested in the factory mechanical property (0 d aging) el Within + -10 MPa, i.e. high safety: the factory performance of the steel bar is more close to the actual service performance, and the safety risk in the service process is effectively eliminated. .
Drawings
FIG. 1 is a graph showing the change in the yield strength of a conventional steel bar undergoing natural aging;
FIG. 2 is a metallographic structure photograph of a steel bar according to example 1 of the present invention;
fig. 3 is a graph of the natural aging of the yield strength of the steel bar of example 1 of the present invention; d is day;
FIG. 4 is a metallographic structure photograph of a steel bar according to example 2 of the present invention;
FIG. 5 is a graph of the natural aging of the yield strength of the steel bar of example 2 of the present invention; d means days.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, the present invention will now be described with reference to the accompanying drawings.
After the initial residual stress of the steel bar is greatly reduced, the steel bar can not be reduced in yield strength or has small change amplitude due to stress relaxation in the normal service process or after natural aging, so that the safety of the steel bar in the using process is improved.
The invention discloses a process control point and technical parameter control and detection method, which comprises the following steps:
1) The steel bar is produced according to the organization of HRB400E mark in GB/T1499.2-2018 standard, and the process route is as follows: converter steelmaking, square billet continuous casting, heating, continuous rolling, cooling after rolling and natural cooling of a cooling bed.
2) The steelmaking process adopts a microalloying process, V, B (boron) is added into steel, the Mn content is improved and other alloying means are adopted, and the formula 1 (mass fraction%) C:0.21 to 0.25Wt%, si: 0.40-0.60 Wt%, mn: 1.35-1.50 Wt%, V: 0.025-0.035 Wt%, N: 0.0070-0.0100 Wt%, B: 0.0012-0.0025 Wt%, P, S is not more than 0.040; the balance of Fe; the V (N) and B alloys are added when tapping is carried out to 1/3, so as to ensure the yield and the uniformity of components.
3) And (3) continuous casting process: the casting blank size is 165 multiplied by 165mm square blank, and the casting blank drawing speed is 2.3-3.0 m/min, so that the blank cracks can be controlled. And the added B has the cracking tendency, so the casting blank pulling speed needs to be controlled at a reasonable speed.
4) Heating in a stepping continuous heating furnace at 1150-1180 deg.c for 68-75min.
5) The initial rolling temperature is 1030-1050 ℃, and the rolling specification is phi 12-phi 22mm.
6) The rolling speed of the finished product rack is 11-15 m/s, water cooling is adopted after rolling, and the temperature of an upper cooling bed is 920-955 ℃.
7) And (5) naturally cooling the steel after the steel is put on a cooling bed.
8) The detection method comprises the following steps: and (4) sampling the steel bars to perform metallographic microstructure analysis, artificial thermal aging or natural aging and tensile test. Metallographic observation is carried out on the structural distribution of the cross section of the steel bar, and the content of B + M is detected under the condition of 500 times of amplification; after the steel bars are rolled, tensile samples are taken on site (the steel temperature is less than or equal to 200 ℃, a plurality of samples are cut out of the same steel bar), when the steel temperature is cooled to room temperature, part of the tensile samples are subjected to tensile test (simulation factory test, aging is 0 d), part of the tensile samples are put into a furnace and heated to 300 ℃ for artificial thermal aging, the tensile samples are cooled to 50 ℃ along with the furnace after being kept warm for 2h, the tensile test is carried out when the temperature is room temperature, part of the samples are subjected to natural aging, the samples are placed to 7d (day), 15d, 30d, 120d and 360d in the open air under the natural environment and then subjected to tensile test, the mechanical properties of the 0d aging and the artificial thermal aging or natural aging tensile test are compared, and the change trend before and after yield strength aging is analyzed and evaluated. The sample size and tensile test are in accordance with GB/T1499.2-2018 standard.
Example 1
The method is applied to HRB400E hot rolled steel bars produced according to GB/T1499.2-2018 standard in the specification of two-segmentation phi 20mm (the specification adopts two-segmentation rolling to ensure the grain size and is beneficial to tissue transformation), and the method specifically comprises the following steps:
the method is applied to HRB400E hot rolled steel bars produced according to GB/T1499.2-2018 standard in a two-segmentation phi 20mm specification in willow steel production, and specifically comprises the following steps:
1) The steel-making process adopts a micro-alloying process, V, B (boron) is added into the steel, the Mn content is improved, and other alloying means are adopted, and the steel comprises the following chemical components in percentage by mass: c:0.21, si:0.45, mn:1.42, V:0.026, B:0.0016, P and S are not more than 0.040; the V, B alloy was added when tapping to 1/3.
2) And (3) continuous casting process: the casting blank size is 165 multiplied by 165mm square blank, and the casting blank drawing speed is 2.8m/min;
3) Heating in a stepping continuous heating furnace at 1160 deg.C for 60min;
4) Rolling at 1035 ℃ and phi 20mm, and continuously rolling by adopting a two-cutting process;
5) The rolling speed of the finished product rack is 12m/s, the finished product rack is cooled by water through cooling after rolling, the temperature of an upper cooling bed is 950 ℃, and the steel is naturally cooled after being arranged on the cooling bed;
6) Controlling steel making and rolling according to the process parameters, wherein the content of B (bainite) + M (martensite) in the core structure of the finished steel bar is 3% (see figure 2), and the rest structures are F + P; the yield strength of 0d aging (factory inspection) is 463MPa, the yield strength after artificial thermal aging is 459MPa, the natural aging result is shown in figure 3, and the yield strength fluctuates within a small range within +/-10 MPa of the 0d aging yield strength 463 MPa.
Example 2
The method is applied to HRB400E hot rolled steel bars produced according to GB/T1499.2-2018 standard in four-segmentation phi 12mm (the specification adopts four-segmentation rolling to ensure the grain size and is beneficial to tissue transformation) in the production of the willow steel, and the specific steps are as follows:
1) The steel-making process adopts a microalloying process, V, B (boron) is added into steel, alloying means such as Mn content improvement and the like are adopted, and the steel comprises the following chemical components in percentage by mass: c:0.24, si:0.50, mn:1.32, V:0.025, B:0.0014, P and S are not more than 0.040; the V, B alloy was added when tapping to 1/3.
2) And (3) continuous casting process: the casting blank size is 165 multiplied by 165mm square blank, and the casting blank drawing speed is 2.9m/min;
3) Heating in a stepping continuous heating furnace at 1170 deg.C for 63min;
4) The initial rolling temperature is 1045 ℃, the rolling specification is phi 12mm, and a four-slitting process and continuous rolling are adopted;
5) The rolling speed of the finished product rack is 13.5m/s, the finished product rack is cooled by water after rolling, the temperature of an upper cooling bed is 920 ℃, and the steel is naturally cooled after being arranged on the cooling bed;
6) Controlling steel making and rolling according to the process parameters, wherein the content of B + M in the core structure of the finished steel bar is 6% (see figure 4), and the rest structures are F + P; the yield strength after 0d aging (factory inspection) is 430MPa, the yield strength after artificial thermal aging is 440MPa, the natural aging result is shown in figure 5, and the yield strength fluctuates within a small range within +/-10 MPa of the yield strength value 430MPa after 0d aging.
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 (8)
1. The high-safety hot-rolled steel bar is characterized by comprising the following components in percentage by mass: c:0.21 to 0.25wt%, si:0.40 to 0.60wt%, mn: 1.35-1.50 wt%, V: 0.025-0.035 wt%, N: 0.0070-0.0100 wt%, B:0.0012 to 0.0025 weight percent, and P, S is not more than 0.040; the balance of Fe; the balance of Fe and inevitable impurities; the rolling specification is phi 12-phi 22mm;
the production method of the high-safety hot-rolled steel bar comprises the following steps: converter steelmaking, square billet continuous casting, heating, continuous rolling, cooling after rolling and natural cooling of a cooling bed;
heating by adopting a stepping continuous heating furnace, wherein the heating temperature of a soaking section is 1160-1170 ℃; heating for 68-75min; the initial rolling temperature is 1030-1045 ℃;
the rolling speed of the finished product rack is 11-15 m/s, the finished product rack is cooled by penetrating water after rolling, and the temperature of an upper cooling bed is 920-955 ℃;
the bainite content or B + M content of the steel bar core part is controlled to be 2% -6%, and the rest structure is F + P;
the difference value between the natural aging of the hot rolled steel bar and the delivery mechanical property inspection yield value Rel is within +/-10 MPa;
the casting blank size is 165 multiplied by 165mm square blank, and the casting blank drawing speed is 2.8-2.9 m/min;
the V and B alloys are added when tapping is carried out to 1/3, so as to ensure the yield and the uniformity of components.
2. The highly safe hot-rolled steel bar as claimed in claim 1, wherein the hot-rolled steel bar has a rolling gauge of Φ 12 or Φ 20mm.
3. A highly safe hot-rolled steel bar as claimed in claim 1, wherein the hot-rolled steel bar is HRB400E hot-rolled steel bar, and the content of B + M in the core structure of the finished steel bar is 2-6%.
4. The highly safe hot-rolled steel bar as claimed in claim 1, wherein the Φ 20mm gauge is subjected to a two-slitting process.
5. The highly safe hot-rolled steel bar as claimed in claim 1, wherein the Φ 12mm gauge is fabricated by a four-slitting process.
6. A highly safe hot-rolled steel bar as claimed in claim 1, wherein the hot-rolled steel bar has a composition comprising, in mass fractions: c:0.21wt%, si:0.45wt%, mn:1.42wt%, V:0.026wt%, B:0.0016wt% and P, S are not more than 0.040wt%.
7. The highly safe hot-rolled steel bar as claimed in claim 1, wherein the hot-rolled steel bar has a composition comprising, in mass percent: c:0.24wt%, si:0.50wt%, mn:1.32wt%, V:0.025wt%, B:0.0014wt% and P, S are not more than 0.040wt%.
8. A highly safe hot-rolled steel bar as claimed in claim 1, wherein the steel is naturally cooled after being loaded on a cooling bed.
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| CN112139240A (en) * | 2020-08-11 | 2020-12-29 | 柳州钢铁股份有限公司 | Production method for reducing performance line difference of reinforcing steel bar |
| CN112779460A (en) * | 2020-12-24 | 2021-05-11 | 武钢集团昆明钢铁股份有限公司 | Production method of HRB500E fine-grain high-strength anti-seismic anti-corrosion reinforcing steel bar |
| CN113444968A (en) * | 2021-06-10 | 2021-09-28 | 广西柳钢华创科技研发有限公司 | HRB400E general speed hot rolling ribbed steel bar with tensile strength above 700Mpa and production method thereof |
| CN113528938A (en) * | 2021-06-10 | 2021-10-22 | 广西柳钢华创科技研发有限公司 | HRB600E normal speed hot rolled ribbed steel bar with yield ratio more than 1.26 and production method thereof |
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| CN115181904A (en) | 2022-10-14 |
| CN114196876A (en) | 2022-03-18 |
| CN114196876B (en) | 2022-06-24 |
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