CN114645193B - HRB600E twisted steel bar produced by high-speed bar - Google Patents
HRB600E twisted steel bar produced by high-speed bar Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- 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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- 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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- 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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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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Abstract
The invention provides HRB600E twisted steel produced by a high-speed bar, which comprises the following components: c: 0.23-0.28 Wt%, Si: 0.65-0.80 Wt%, Mn: 1.25-1.45 Wt%, P: less than or equal to 0.04Wt%, S: less than or equal to 0.035Wt%, V: 0.065-0.10 Wt%, Nb: 0.008-0.02 Wt%, N: 0.015-0.028 Wt%, B: 0.0015-0.0035 Wt%, Cr: 0.1-0.2 Wt%. The production cost is reduced, the production efficiency is high, and the surface quality is good.
Description
The invention comprises the following steps: is the application number: 2021105928312, filing date: year 2021, month 5, day 28, title: a method for producing HRB600E twisted steel bars by high-speed bars and a divisional application of HRB600E twisted steel bars produced by the high-speed bars.
Technical Field
The invention relates to the field of metallurgy, in particular to HRB600E threaded steel bars produced by high-speed bars.
Background
The steel bar produced by the high-speed bar has good control on the overall dimension, the finish rolling speed can reach 45 m/s or above, and the steel bar has the advantages of high yield, high quality and low cost, and is the development trend of the production of the current medium and small-sized twisted steel bars. Because the high-speed bar has high deformation speed and can use the controlled rolling and controlled cooling process, the HRB400E steel bar with fine grains is produced. However, when HRB600E steel bar with higher strength is produced, the fine grain strengthening has large contribution to yield strength and weak contribution to tensile strength, and the strength-to-yield ratio R DEG of HRB600E anti-seismic steel bar in the standard T/CISA 026-2020, HRB600E anti-seismic hot rolled ribbed steel bar for reinforced concrete, of the society of iron and Steel industries of China is difficult to meet m /R° eL The requirement is 1.25 or more.
In summary, the following problems exist in the prior art: the high-speed bar production line is difficult to generate a high yield ratio R DEG m /R° eL HRB600E twisted steel bar of 1.25 or more.
Disclosure of Invention
The technical problem solved by the embodiment of the invention is that a high-speed bar production line is difficult to generate a high yield ratio R DEG m /R° eL HRB600E rebar of 1.25 or more.
To this end, in one aspect, the embodiments of the present invention provide a method for producing HRB600E twisted steel by using a high-speed bar material, where the method for producing HRB600E twisted steel by using a high-speed bar material includes:
the following steps are carried out in sequence: smelting blast furnace molten iron, desulfurizing and pretreating the molten iron, smelting converter molten steel, blowing argon, LF refining, continuously casting square billets, heating by a heating furnace, roughly rolling, medium rolling, pre-finish rolling, controlled cooling and recovering, finish rolling, controlled cooling and recovering after rolling;
the components of the HRB600E twisted steel produced by the high-speed bar are as follows: c: 0.23-0.28 Wt%, Si: 0.65-0.80 Wt%, Mn: 1.25-1.45 Wt%, P: less than or equal to 0.04Wt%, S: less than or equal to 0.035Wt%, V: 0.065-0.10 Wt%, Nb: 0.008-0.02 Wt%, N: 0.015-0.028 Wt%, B: 0.0015-0.0035 Wt%, Cr: 0.1-0.2 Wt%.
Specifically, for HRB500E twisted steel with the specification of 10-16 mm, the components are as follows: c: 0.23-0.28 Wt%, Si: 0.65-0.80 Wt%, Mn: 1.25-1.45 Wt%, P: less than or equal to 0.04Wt%, S: less than or equal to 0.035Wt%, V: 0.065-0.085 Wt%, Nb: 0.008-0.02 Wt%, N: 0.015-0.025 Wt%, B: 0.0015-0.0025 Wt%, Cr: 0.1-0.2 Wt%.
Specifically, for HRB500E twisted steel with the specification of 18-25 mm, the components are as follows: c: 0.23-0.28 Wt%, Si: 0.65-0.80 Wt%, Mn: 1.25-1.45 Wt%, P: less than or equal to 0.04Wt%, S: less than or equal to 0.035Wt%, V: 0.080-0.10 Wt%, Nb: 0.008-0.02 Wt%, N: 0.018-0.028 Wt%, B: 0.0025-0.0035 Wt%, Cr: 0.1-0.2 Wt%.
Specifically, the converter molten steel smelting step comprises: the S of the molten iron fed into the furnace is required to be less than or equal to 0.045 Wt%; 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 0.15 Wt% C and less than or equal to 0.037 Wt% P.
Specifically, the continuous casting of the square billet is carried out by adopting ladle slag discharge detection control, and the pouring temperature of a tundish is 1520-1540 ℃.
Specifically, the HRB600E twisted steel produced by the high-speed bar comprises the following components in percentage by weight: c: 0.28Wt%, Si: 0.72Wt%, Mn: 1.35Wt%, P: 0.032Wt%, S: 0.028Wt%, V: 0.072Wt%, Nb: 0.015Wt%, N: 0.0189Wt%, B: 0.002Wt%, Cr: 0.13 Wt%.
Specifically, the HRB600E twisted steel produced by the high-speed bar comprises the following components in percentage by weight: c: 0.25 Wt%, Si: 0.73 Wt%, Mn: 1.32 Wt%, P: 0.027 Wt%, S: 0.027 Wt%, V: 0.075 Wt%, Nb: 0.017 Wt%, N: 0.0201 Wt%, B: 0.0019 Wt%, Cr: 0.15 Wt%.
Specifically, no cooling control equipment is arranged behind the reducing mill and in front of the upper cooling bed, so that the steel bar is in a natural cooling state, and the surface of the steel bar obtains higher temperature of the upper cooling bed.
Specifically, the HRB600E twisted steel is produced by the high-speed bar, the specification is 10mm, and the finish rolling speed is 42 m/S.
On the other hand, the embodiment of the invention also provides a high-speed bar for producing HRB600E twisted steel, and the HRB600E twisted steel produced by the high-speed bar comprises the following components: c: 0.23-0.28 Wt%, Si: 0.65-0.80 Wt%, Mn: 1.25-1.45 Wt%, P: less than or equal to 0.04Wt%, S: less than or equal to 0.035Wt%, V: 0.065-0.10 Wt%, Nb: 0.008-0.02 Wt%, N: 0.015-0.028 Wt%, B: 0.0015-0.0035 Wt%, Cr: 0.1-0.2 Wt%, and is manufactured by adopting a method for producing HRB600E twisted steel bars by using high-speed bars.
Compared with the HRB600E steel bar of the conventional production line, the alloy addition amount is reduced, and the production cost is reduced. The qualified HRB600E steel bars can be successfully produced by a high-speed bar production line, and the production efficiency and the surface quality are high. The elements with large contribution to the tensile strength are controlled according to the upper limit, elements which can enable the CCT curve to move to the right, such as V, N, B, Cr, Nb and the like are added, and finally a small amount of bainite structures are formed in the core metallographic structure of the high-speed bar HRB600E anti-seismic steel bar, so that reasonable yield strength and high tensile strength are 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 invention provides a method for producing HRB600E threaded steel bars by high-speed bars, which comprises the following steps:
the production process of the single-wire high-speed bar steel bar comprises the following steps: blast furnace molten iron smelting, molten iron desulphurization pretreatment, converter molten steel smelting, argon blowing, LF refining, square billet continuous casting, heating furnace heating, rough rolling (6 frames), medium rolling (6 frames), pre-finish rolling (6 frames), single line, controlled cooling and recovery section, finish rolling (4 frames), finish rolling (diameter shearing 2 frames), controlled cooling and recovery section after rolling, pinch roll, disc double-length shear, braking device, hub device, cooling bed cooling, fixed-length shear, inspection, packaging and warehousing
The production process of the double-line high-speed bar steel bar comprises the following steps: blast furnace molten iron smelting, molten iron desulphurization pretreatment, converter molten steel smelting, argon blowing, LF refining, square billet continuous casting, heating by a heating furnace, rough rolling (6 frames), medium rolling (6 frames), pre-finish rolling (6 frames) and cutting into double lines, a controlled cooling and recovery section multiplied by 2, finish rolling (4 frames) multiplied by 2, a shearing diameter of 2 frames multiplied by 2, a controlled cooling and recovery section multiplied by 2 after rolling, a pinch roll multiplied by 2, a disc double-length shearing multiplied by 2, a braking device multiplied by 2, a rotating hub device multiplied by 2, cooling bed cooling, fixed-length shearing, 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 0.045 Wt%; 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 0.15 Wt% C and less than or equal to 0.037 Wt% P;
and (3) square billet continuous casting, wherein ladle slag discharging detection control is adopted, the pouring temperature of a tundish is 1520-1540 ℃, the tundish uses a common covering agent, common square billet covering slag is used, and the casting blank single flow casting speed is 3.0-4.0 m/min.
1. The components:
(1) c, Si: the solid solution strengthening effect is achieved, the contribution to the tensile strength is large, the contribution to the yield strength is small, and the upper limit is controlled.
(2) Mn: the solid solution strengthening effect is achieved, the contribution to the yield strength is slightly high, the cost can be reduced by controlling Mn at a moderate level, and the lost strength is compensated by fine crystalline strengthening at a lower temperature.
(3) Adding Nb to raise austenite recrystallization temperature, realizing non-recrystallization rolling at higher temperature and having precipitation strengthening effect, raising strength and increasing iron scale thickness. 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.
(4) V, N, 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, thereby reducing the austenite grain boundary energy and improving the stability of austenite in the temperature range above martensite, therefore, trace B can obviously improve the hardenability of steel.
(5) Cr element. Cr has the solid solution strengthening effect, the diffusion speed of Cr in austenite is relatively low, and the diffusion of carbon can be hindered, so that the stability of austenite can be improved, the CCT curve can be shifted to the right, the critical cooling speed is reduced, the hardenability is improved, and bainite can be formed.
TABLE 1 HRB600E ingredients (wt%)
Specifically, the HRB600E twisted steel produced by the high-speed bar comprises the following components in percentage by weight: c: 0.28Wt%, Si: 0.72Wt%, Mn: 1.35Wt%, P: 0.032Wt%, S: 0.028Wt%, V: 0.072Wt%, Nb: 0.015Wt%, N: 0.0189Wt%, B: 0.002Wt%, Cr: 0.13 Wt%.
Specifically, the HRB600E twisted steel produced by the high-speed bar comprises the following components in percentage by weight: c: 0.25 Wt%, Si: 0.73 Wt%, Mn: 1.32 Wt%, P: 0.027 Wt%, S: 0.027 Wt%, V: 0.075 Wt%, Nb: 0.017 Wt%, N: 0.0201 Wt%, B: 0.0019 Wt%, Cr: 0.15 Wt%.
2. Arranging a rolling line:
6 rough rolling frames, 6 middle rolling frames, 6 pre-finish rolling frames, a controlled cooling device, a recovery section, 4 finishing mill sets, a controlled cooling device, a recovery section and 2 reducing mills.
6 stands of short stress line rolling mill of roughing mill group, 6 stands of short stress line rolling mill of medium rolling and 6 stands of short stress line rolling mill of pre-finish rolling (all stands are connected by loop, the bar is cut twice from the 4 th stand and enters two channels at the outlet of pre-finish rolling respectively)
The finishing mill group is two lines and adopts 4 top-crossed cantilevers (V-shaped) of 45 degrees to have no torsion and overload type Morgan rolling mills, 2 groups of modules are totally adopted, and each group of modules is driven by a motor alone, compares the collective transmission, has following advantages: each group of rollers can be independently regulated, the speed regulation range is wide, and the speed regulation flexibility is high; each motor has small power and small size; is convenient for maintenance and repair.
The reducing unit adopts 2 frames of 45-degree top-cross cantilever reducing machines for independent transmission. The addition of the reducing unit can realize rolling below the recrystallization temperature or in a dual-phase region (namely, heat engine rolling), and the aims of refining grains and improving the performance of steel are fulfilled by designing a deformation system of the last two passes to crush the grains and inducing ferrite phase change through deformation. In addition, the production rate of the rolling mill can be improved, the dimensional tolerance and the surface quality of products can be improved, the variety and the specification can be increased, the metallurgical performance of the products can be improved, and the like.
3. The rolling process comprises the following steps:
(1) heating the billet for 60-90 minutes, and beginning rolling: 1030 +/-30 ℃.
(2) Double-line and single-line rolling with the specification of phi 10-phi 16 mm: the temperature of finish rolling and the temperature of the reducing mill are controlled, the austenite recrystallization temperature is increased by Nb, the non-recrystallization rolling of austenite can be realized at higher temperature, cooling control equipment cannot be installed behind the reducing mill, the formation of the scale is facilitated, and the temperature of the reducing mill can be slightly higher due to large deformation during single-line rolling, so that the generation of the scale is more facilitated.
The steel bar is in a natural cooling state, and the surface of the steel bar obtains higher temperature of the upper cooling bed.
(3) Double-line and single-line rolling with phi 18-phi 25 specifications: 4 finishing mill groups (4 finishing mill groups from No. 19 to No. 22) are not put into use, the water tanks after pre-finish rolling and finish rolling are used by utilizing the concept of graded cooling control and are kept in a long-open state, the phenomenon that the intensity of primary cooling is too high and is not beneficial to the control of organization and iron scale is avoided, and the temperature of the reducer can be slightly higher due to the large deformation during single-line rolling, so that the generation of the iron scale is more beneficial. After the reducing mill is arranged to the front of the upper cooling bed, no cooling control equipment is arranged and used, so that the steel bar is in a natural cooling state, and the surface of the steel bar obtains higher temperature of the upper cooling bed.
(4) The deformation of the last two frames (K1, K2) is more than 15%.
TABLE 2 Rolling Key temperature (wt%)
The HRB600E twisted steel is produced by the high-speed bar, the specification is 10mm, and the finish rolling speed is 42 m/S.
4. Final rolling speed: the rolling speed is kept higher for different specifications, which is beneficial to grain refinement (see table 3).
TABLE 3 Final Rolling speeds
5. Cooling by a cooling bed: the reinforcing steel bars are stored on each tooth of the stepping cooling bed, so that heat dissipation is accelerated, and large-size reinforcing steel bars are cooled by air on the cooling bed.
The measures can control the bainite content at the edge part of the cross section of the HRB600E steel bar structure to be 0%, the bainite content at 1/4 part to be 0% and the bainite content at the center part of the cross section to be 1-10%. And successfully producing qualified HRB600E steel bars by using a high-speed bar production line.
The invention also provides a high-speed bar for producing HRB600E twisted steel, and the HRB600E twisted steel produced by the high-speed bar comprises the following components: c: 0.23-0.28 Wt%, Si: 0.65-0.80 Wt%, Mn: 1.25-1.45 Wt%, P: less than or equal to 0.04Wt%, S: less than or equal to 0.035Wt%, V: 0.065-0.10 Wt%, Nb: 0.008-0.02 Wt%, N: 0.015-0.028 Wt%, B: 0.0015-0.0035 Wt%, Cr: 0.1-0.2 Wt%, and is manufactured by adopting a method for producing HRB600E twisted steel bars by using high-speed bars.
For HRB500E twisted steel with the specification of 10-16 mm, the components are as follows: c: 0.23-0.28 Wt%, Si: 0.65-0.80 Wt%, Mn: 1.25-1.45 Wt%, P: less than or equal to 0.04Wt%, S: less than or equal to 0.035Wt%, V: 0.065-0.085 Wt%, Nb: 0.008-0.02 Wt%, N: 0.015-0.025 Wt%, B: 0.0015-0.0025 Wt%, Cr: 0.1-0.2 Wt%.
For HRB500E twisted steel with the specification of 18-25 mm, the components are as follows: c: 0.23-0.28 Wt%, Si: 0.65-0.80 Wt%, Mn: 1.25-1.45 Wt%, P: less than or equal to 0.04Wt%, S: less than or equal to 0.035Wt%, V: 0.080-0.10 Wt%, Nb: 0.008-0.02 Wt%, N: 0.018-0.028 Wt%, B: 0.0025-0.0035 Wt%, Cr: 0.1-0.2 Wt%.
Specifically, the HRB600E twisted steel produced by the high-speed bar comprises the following components in percentage by weight: c: 0.28Wt%, Si: 0.72Wt%, Mn: 1.35Wt%, P: 0.032Wt%, S: 0.028Wt%, V: 0.072Wt%, Nb: 0.015Wt%, N: 0.0189Wt%, B: 0.002Wt%, Cr: 0.13 Wt%.
Specifically, the HRB600E twisted steel produced by the high-speed bar comprises the following components in percentage by weight: c: 0.25 Wt%, Si: 0.73 Wt%, Mn: 1.32 Wt%, P: 0.027 Wt%, S: 0.027 Wt%, V: 0.075 Wt%, Nb: 0.017 Wt%, N: 0.0201 Wt%, B: 0.0019 Wt%, Cr: 0.15 Wt%.
Compared with the HRB600E steel bar of the conventional production line, the alloy addition amount is reduced, and the production cost is reduced. The qualified HRB600E steel bars can be successfully produced by a high-speed bar production line, and the production efficiency and the surface quality are high. The elements with large contribution to the tensile strength are controlled according to the upper limit, elements which can enable the CCT curve to move to the right, such as V, N, B, Cr, Nb and the like are added, and finally a small amount of bainite structures are formed in the core metallographic structure of the high-speed bar HRB600E anti-seismic steel bar, so that reasonable yield strength and high tensile strength are obtained.
Example (b):
1. the technology for producing phi 10-25 mm straight twisted steel bars by using double-line high-speed bars comprises the following steps: blast furnace molten iron smelting, molten iron desulphurization pretreatment, converter molten steel smelting, argon blowing, LF refining, square billet continuous casting, heating by a heating furnace, rough rolling (6 frames), intermediate rolling (6 frames), pre-finish rolling (6 frames) and cutting into double lines, a controlled cooling and recovery section multiplied by 2, finish rolling (4 frames) multiplied by 2, a shearing diameter 2 frames multiplied by 2, a controlled cooling and recovery section multiplied by 2 after rolling, a pinch roll multiplied by 2, a disc double-length shear multiplied by 2, a braking device multiplied by 2, a hub device multiplied by 2, cooling bed cooling, fixed-length shearing, inspecting, packaging and warehousing.
2. The heating time of the steel billet is 60-90 minutes, and the initial rolling temperature is 1010-1050 ℃.
3. The following components are mixed and processed in a specific process. Wherein, Table 4 shows the compositions (in weight%) of the steels of the respective examples. Table 5 shows the production specifications, process parameters, mechanical properties, scale thickness corresponding to the example steels described in table 4.
Table 4: chemical composition of product (wt%)
| Examples of the invention | C | Si | Mn | P | S | V | Nb | N | B | Cr |
| Example 1 | 0.28 | 0.72 | 1.35 | 0.032 | 0.028 | 0.072 | 0.015 | 0.0189 | 0.0020 | 0.13 |
| Example 2 | 0.25 | 0.73 | 1.32 | 0.027 | 0.027 | 0.075 | 0.017 | 0.0201 | 0.0019 | 0.15 |
| Example 3 | 0.26 | 0.70 | 1.30 | 0.030 | 0.034 | 0.078 | 0.013 | 0.0212 | 0.0022 | 0.17 |
| Example 4 | 0.24 | 0.68 | 1.37 | 0.029 | 0.031 | 0.085 | 0.015 | 0.0232 | 0.0032 | 0.15 |
| Example 5 | 0.27 | 0.75 | 1.39 | 0.031 | 0.028 | 0.092 | 0.016 | 0.0241 | 0.0031 | 0.14 |
Table 5: specific process parameters and mechanical properties of the examples
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 (2)
1. The high-speed bar material for producing the HRB600E twisted steel is characterized in that the high-speed bar material for producing the HRB600E twisted steel comprises the following components: c: 0.23 to 0.28wt%, Si: 0.65-0.80 wt%, Mn: 1.25-1.35 wt%, P: less than or equal to 0.04wt%, S: less than or equal to 0.035wt%, V: 0.065-0.072 wt%, Nb: 0.008-0.02 wt%, N: 0.015-0.028 wt%, B: 0.0015-0.0035 wt%, Cr: 0.1-0.13 wt%, producing HRB600E twisted steel by the high-speed bar, wherein the specification is 10mm, and the final rolling speed is 42 m/s;
arranging a rolling line: 6 rough rolling frames, 6 middle rolling frames, 6 pre-finish rolling frames, a controlled cooling device, a recovery section, 4 finishing mill sets, a controlled cooling device, a recovery section and a 2 reducing mill;
the finishing mill group is divided into 2 groups of modules, wherein two lines adopt 4 frames of 45-degree top-crossed cantilever V-shaped non-torsion overload Morgan rolling mills, and each group of modules is independently driven by a motor;
the reducing unit adopts 2 top-delivery cantilever reducing machines with 45 degrees and is driven independently;
the pass deformation of the last two frames is more than 15 percent;
the finish rolling temperature is 902 ℃, the diameter reducing temperature is 862 ℃ and the yield ratio is 1.27.
2. The high-speed bar-produced HRB600E twisted steel of claim 1, wherein the HRB600E twisted steel produced by the high-speed bar comprises the following components by weight percent: c: 0.28wt%, Si: 0.72wt%, Mn: 1.35wt%, P: 0.032wt%, S: 0.028wt%, V: 0.072wt%, Nb: 0.015wt%, N: 0.0189wt%, B: 0.002wt%, Cr: 0.13 wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210137269.9A CN114645193B (en) | 2021-05-28 | 2021-05-28 | HRB600E twisted steel bar produced by high-speed bar |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210137269.9A CN114645193B (en) | 2021-05-28 | 2021-05-28 | HRB600E twisted steel bar produced by high-speed bar |
| CN202110592831.2A CN113388781B (en) | 2021-05-28 | 2021-05-28 | Method for producing HRB600E threaded steel bar by high-speed bar and HRB600E threaded steel bar produced by high-speed bar |
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