CN111455281B - Method for controlling yield strength fluctuation of same ring of HRB400E wire rod twisted steel and HRB400E wire rod twisted steel - Google Patents
Method for controlling yield strength fluctuation of same ring of HRB400E wire rod twisted steel and HRB400E wire rod twisted steel Download PDFInfo
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- CN111455281B CN111455281B CN202010306550.1A CN202010306550A CN111455281B CN 111455281 B CN111455281 B CN 111455281B CN 202010306550 A CN202010306550 A CN 202010306550A CN 111455281 B CN111455281 B CN 111455281B
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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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- 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
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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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/34—Blowing through the bath
Abstract
The invention provides a control method for same-circle yield strength fluctuation of HRB400E coiled steel bar and HRB400E coiled steel bar with smaller same-circle yield strength fluctuation difference. The method for controlling the yield strength fluctuation of the same-circle threaded steel bar of the HRB400E coil rod comprises the following steps: step A: controlling components in a smelting stage; and B: after smelting, before finish rolling, a controlled cooling device is used, and the finish rolling temperature is controlled; and C: after finish rolling, the spinning temperature is reduced by using a cooling control device and is controlled to 765-865 ℃. The HRB400E wire rod twisted steel bar with the same ring and smaller yield strength fluctuation difference comprises the following components: c: 0.19 to 0.25 wt%, Si: 0.60-0.75 wt%, Mn: 1.10-1.25 wt%, P: less than or equal to 0.040 wt%, S less than or equal to 0.035 wt%, V: 0.008-0.020 wt%, Cr: less than or equal to 0.10wt percent. The invention controls the yield fluctuation of the same-circle strength within 40 MPa.
Description
Technical Field
The invention relates to the field of metallurgy, in particular to a method for controlling yield strength fluctuation of an HRB400E wire rod twisted steel in the same circle and an HRB400E wire rod twisted steel with smaller yield strength fluctuation difference in the same circle, and especially relates to a method for controlling yield strength fluctuation of an HRB400E wire rod twisted steel (hereinafter referred to as HRB400E wire rod) in the same circle with the specification of phi 6-12 mm and an HRB400E wire rod twisted steel with smaller yield strength fluctuation difference in the same circle.
Background
HRB400E wire rod twisted steel is produced by a high-speed wire rod production line, is transported backwards on a stelmor roller way after spinning, and controls the cooling strength and uniformity of the wire rod after rolling by adjusting a Jialing device, a fan opening and the roller way speed of the stelmor roller way. However, after spinning, the wire rod on the stelmor roller table has lap points and non-lap points, so that cooling unevenness inevitably exists, and the larger the cooling strength of the stelmor roller table is, the more obvious the cooling unevenness is, so that the yield strength fluctuation of the wire rod is too large and can exceed 80 MPa.
In summary, the following problems exist in the prior art: the yield strength fluctuation of the same coil of the HRB400E coiled steel bar is large.
Disclosure of Invention
The invention provides a control method for same-circle yield strength fluctuation of HRB400E coiled steel bars and HRB400E coiled steel bars with smaller same-circle yield strength fluctuation difference, so as to solve the problem that the same-circle yield strength fluctuation of HRB400E coiled steel bars is larger.
Therefore, the invention provides a method for controlling the yield strength fluctuation of the same coil of the HRB400E twisted steel, and the method for controlling the yield strength fluctuation of the same coil of the HRB400E twisted steel comprises the following steps:
step A: and B, component control in a smelting stage, wherein the step A comprises the following steps: controlling the contents of Mn and Cr elements with high hardenability; increasing the content of Si, and adding a V element to be combined with N in molten steel; the HRB400E wire rod twisted steel comprises the following components in percentage by weight: c: 0.19 to 0.25 wt%, Si: 0.60-0.75 wt%, Mn: 1.10-1.25 wt%, P: less than or equal to 0.040 wt%, S less than or equal to 0.035 wt%, V: 0.008-0.020 wt%, Cr: less than or equal to 0.10 weight percent
And B: after smelting, before finish rolling, a controlled cooling device is used, and the finish rolling temperature is controlled;
and C: after finish rolling, the spinning temperature is reduced by using a cooling control device and is controlled to 765-865 ℃.
And further, in the step C, controlling the finish rolling temperature to be 880-900 ℃.
Further, in the step A, the HRB400E wire rod twisted steel comprises the following components in percentage by weight: c: 0.22 wt%, Si: 0.68 wt%, Mn: 1.15 wt%, P: 0.025 wt%, S: 0.022 wt%, V: 0.010 wt%, Cr: 0.04 wt%.
Further, in the step A, the HRB400E wire rod twisted steel comprises the following components in percentage by weight: c: 0.22 wt%, Si: 0.65 wt%, Mn: 1.20 wt%, P: 0.030 wt%, S: 0.020 wt%, V: 0.012 wt%, Cr: 0.08 wt%.
Further, in the step A, the HRB400E wire rod twisted steel comprises the following components in percentage by weight: c: 0.24 wt%, Si: 0.67 wt%, Mn: 1.18 wt%, P: 0.020 wt%, S: 0.019 wt%, V: 0.015 wt%, Cr: 0.05 wt%.
Further, in the step A, the HRB400E wire rod twisted steel comprises the following components in percentage by weight: c: 0.21 wt%, Si: 0.61 wt%, Mn: 1.15 wt%, P: 0.027 wt%, S: 0.020 wt%, V: 0.011 wt%, Cr: 0.09 wt%.
Furthermore, in the step B, the spinning temperature of the HRB400E wire rod twisted steel with the specification of phi 6mm is controlled to be 850 +/-15 ℃.
Furthermore, in the step B, the spinning temperature of HRB400E wire rod twisted steel with the specification of phi 12mm is controlled to be 780 +/-15 ℃.
The invention also provides an HRB400E wire rod twisted steel with small fluctuation difference of yield strength in the same circle, and the HRB400E wire rod twisted steel comprises the following components in percentage by weight: c: 0.19 to 0.25 wt%, Si: 0.60-0.75 wt%, Mn: 1.10-1.25 wt%, P: less than or equal to 0.040 wt%, S less than or equal to 0.035 wt%, V: 0.008-0.020 wt%, Cr: less than or equal to 0.10 wt%, and the yield strength fluctuation of the same coil of the HRB400E wire rod threaded steel bar is controlled within 40 MPa.
Further, the HRB400E wire rod twisted steel with small fluctuation difference of the yield strength in the same ring comprises the following components in percentage by weight: c: 0.21 wt%, Si: 0.61 wt%, Mn: 1.15 wt%, P: 0.027 wt%, S: 0.020 wt%, V: 0.011 wt%, Cr: 0.09 wt%.
Further, the HRB400E wire rod twisted steel with small fluctuation difference of the yield strength in the same ring comprises the following components in percentage by weight: c: 0.22 wt%, Si: 0.68 wt%, Mn: 1.15 wt%, P: 0.025 wt%, S: 0.022 wt%, V: 0.010 wt%, Cr: 0.04 wt%.
Further, the HRB400E wire rod twisted steel with small fluctuation difference of the yield strength in the same ring comprises the following components in percentage by weight: c: 0.22 wt%, Si: 0.65 wt%, Mn: 1.20 wt%, P: 0.030 wt%, S: 0.020 wt%, V: 0.012 wt%, Cr: 0.08 wt%.
Further, the HRB400E wire rod twisted steel with small fluctuation difference of the yield strength in the same ring comprises the following components in percentage by weight: c: 0.24 wt%, Si: 0.67 wt%, Mn: 1.18 wt%, P: 0.020 wt%, S: 0.019 wt%, V: 0.015 wt%, Cr: 0.05 wt%.
The principle of the invention is as follows: (1) the strong hardenability elements Mn and Cr in the steel are reduced in the component design, the nonuniformity of the stelmor roller bed during air cooling is reduced, and the strength improvement is provided by improving the Si content and adding the V element to be combined with N in the molten steel; (2) before finish rolling, the controlled cooling equipment is used, and the lower finish rolling temperature is controlled, so that the lower finish rolling temperature can be obtained; (3) compared with the high spinning temperature, the low spinning temperature has the advantages that the heat transfer efficiency of the wire rod in a low-temperature area is low, the temperature drop speed is low, and the nonuniformity of the wire rod in the stelmor roller way during air cooling can be reduced. Therefore, the fluctuation of the yield strength of the same coil of the wire rod can be effectively controlled.
The invention relates to a method for controlling the same-circle strength fluctuation of HRB400E coiled steel bar, which comprises the following steps: blast furnace molten iron smelting → molten iron desulphurization pretreatment → converter molten steel smelting → square billet continuous casting → high-speed line rolling → spinning → inspection, packaging and warehousing; wherein, the process characteristics of each stage are as follows:
smelting molten steel in a converter: s is required to be less than or equal to 0.040 Wt% 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; 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 deslagging detection control is adopted, the pouring temperature of a tundish is 1525-1545 ℃, the tundish uses a common covering agent and common square billet covering slag, and the single flow pulling speed of a casting blank is 2.5-3.2 m/min.
Rolling the high-speed wire rods: the heating temperature of a casting blank is controlled to be 1050-1170 ℃, the heating time of a steel billet is controlled to be 80-120 minutes, the initial rolling temperature is 950-1000 ℃, 28 high-speed non-twisted single-line rolling is adopted, cooling control equipment is used before and after finish rolling, and the finish rolling temperature is controlled to be 880-900 ℃.
Based on the principle, the invention discloses a method for controlling the same-ring strength fluctuation of HRB400E wire rod threaded steel bars, which comprises the following specific technical measures:
1. reasonable components:
(1) the manganese content. Manganese is dissolved in ferrite and cementite in steel, and plays a role in solid solution strengthening, so that the stability of the super-cooled austenite is improved, and the hardenability is improved. Too high Mn content increases uneven cooling of the lap and non-lap points of the wire rod.
(2) The Cr content. 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 C curve can be shifted to the right, the critical cooling speed is reduced, the hardenability is improved, and the phenomenon of uneven cooling of a lapping point and a non-lapping point of a wire rod is aggravated.
Properly reducing the Mn content in the steel according to the influence of various components in the steel on uneven cooling of the wire rod, and controlling Cr brought by scrap steel; the Si content is increased, and the V element is added to be combined with N in molten steel to compensate the strength loss caused by the reduction of the Mn content, as shown in Table 1.
TABLE 1 vanadium microalloying HRB400E composition (wt%)
2. And the finish rolling temperature is lowered. The temperature rise is more in the finish rolling process of high-speed wire rod rolling, the cold control equipment is arranged before finish rolling, the finish rolling temperature is controlled, the finish rolling temperature can be reduced, the cold control strength from finish rolling to spinning is reduced, the resistance of a wire rod passing through the cold control equipment is reduced, and the production stability is enhanced. Therefore, the finish rolling temperature is set to 880 to 900 ℃.
3. Low spinning temperature. After the finish rolling, the controlled cooling equipment is used for reducing the spinning temperature, the hardened austenite state accumulated with a large amount of energy in the rolling deformation process can be kept to an austenite non-recrystallization region, conditions are provided for nucleation and grain refinement in the subsequent phase change process, and the purpose of grain refinement is achieved. Compared with the high spinning temperature, the wire rod has low heat transfer efficiency in a low-temperature region and low temperature drop speed, the nonuniformity of the wire rod during air cooling of the stelmor roller table can be reduced, and the yield strength fluctuation of the same coil of the wire rod is reduced. The spinning temperature and the fan opening of the specification phi 6-12 mm are shown in Table 2.
The invention has the beneficial effects that: the method can control the yield fluctuation of the same-circle strength of the HRB400E wire rod threaded steel bar with the specification of phi 6-12 mm within 40 MPa.
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.
1. The invention firstly carries out reasonable component design: controlling the contents of Mn and Cr elements with high hardenability; the content of Si is increased, and the V element is added to be combined with N in molten steel to make up for the strength loss caused by the reduction of the content of Mn. Table 2 shows the composition (in weight%) of the steels of the examples of the invention. As shown in Table 2, the composition of the present invention was controlled as follows
Table 2: chemical composition (wt%) of product
| Examples of the invention | C | Si | Mn | P | S | V | Cr |
| Example 1 | 0.22 | 0.68 | 1.15 | 0.025 | 0.022 | 0.010 | 0.04 |
| Example 2 | 0.22 | 0.65 | 1.20 | 0.030 | 0.020 | 0.012 | 0.08 |
| Example 3 | 0.24 | 0.67 | 1.18 | 0.020 | 0.019 | 0.015 | 0.05 |
| Example 4 | 0.21 | 0.61 | 1.15 | 0.027 | 0.020 | 0.011 | 0.09 |
2. The low-entry finish rolling temperature is controlled under the reasonable component design: 880-900 ℃;
3. low spinning temperature: 765-865 deg.C, the concrete parameters are shown in Table 3
TABLE 3 HRB400E wire rod twisted steel wire laying temperature and fan starting parameter table with phi 6-12 mm specification
| Specification of | Temperature of spinning | Fan on |
| Phi 6 screw | 850±15℃ | Open 1 ~ 2 # fan |
| Phi 8 spiro | 800±15℃ | Open 1 ~ 3 # fan |
| Phi 10 spiro | 780±15℃ | Open 1 ~ 5 # fan |
| Phi 12 screw | 780±15℃ | Open 1 ~ 6 # fan |
4. Mechanical properties, see Table 4
Table 4: specific process parameters and mechanical properties of the examples
The method can control the yield strength fluctuation of the HRB400E coil bar threaded steel bar with the specification of phi 6-12 mm within 40 MPa.
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 (1)
1. A control method for the yield strength fluctuation of the same coil of HRB400E coiled steel bar is characterized in that the control method for the yield strength fluctuation of the same coil of HRB400E coiled steel bar comprises the following steps:
step A: and B, component control in a smelting stage, wherein the step A comprises the following steps: controlling the contents of Mn and Cr elements with high hardenability; increasing the content of Si, and adding a V element to be combined with N in molten steel; the HRB400E wire rod twisted steel comprises the following components in percentage by weight: c: 0.21 wt%, Si: 0.61 wt%, Mn: 1.15 wt%, P: 0.027 wt%, S: 0.020 wt%, V: 0.011 wt%, Cr: 0.09 wt%;
and B: after smelting, before finish rolling, a controlled cooling device is used, and the finish rolling temperature is controlled; controlling the finish rolling temperature to be 891 ℃;
and C: after finish rolling, reducing the spinning temperature by using a controlled cooling device, and controlling the spinning temperature to be 780 +/-15 ℃ for the HRB400E wire rod twisted steel bar with the specification of phi 12 mm;
the yield strength fluctuation of the same coil of the HRB400E wire rod twisted steel is controlled within 40 MPa.
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| CN202010306550.1A CN111455281B (en) | 2020-04-17 | 2020-04-17 | Method for controlling yield strength fluctuation of same ring of HRB400E wire rod twisted steel and HRB400E wire rod twisted steel |
| CN202110449856.7A CN113265593B (en) | 2020-04-17 | 2020-04-17 | HRB400E wire rod twisted steel bar with small yield strength fluctuation difference in same circle |
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| CN111893279A (en) * | 2020-08-12 | 2020-11-06 | 宝武集团鄂城钢铁有限公司 | Stelmor air-cooled wire-controlled cold production method of HRB400(E) deformed steel bar with yield strength of more than or equal to 420MPa |
| CN113042525B (en) * | 2021-02-24 | 2023-04-07 | 广西柳钢华创科技研发有限公司 | Method for increasing thickness of iron scale on surface of high-speed bar and production method of HRB400E straight threaded steel bar |
| CN113652601B (en) * | 2021-07-06 | 2022-11-29 | 广西柳钢华创科技研发有限公司 | High-speed wire threaded steel with small intensity fluctuation difference and surface iron scale thickness of more than 10 mu m in same circle and production method thereof |
| CN113695386B (en) * | 2021-07-06 | 2023-06-20 | 广西柳钢华创科技研发有限公司 | HRB400E high-speed wire rod threaded steel with same-circle strength fluctuation not greater than 20Mpa and production method thereof |
| CN114836608B (en) * | 2022-04-26 | 2024-02-23 | 包头钢铁（集团）有限责任公司 | Production method for reducing same-circle difference of HRB400E coiled steel bar performance |
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| CN113265593A (en) | 2021-08-17 |
| CN113265593B (en) | 2022-04-12 |
| CN111455281A (en) | 2020-07-28 |
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