CN111974798B - Method for increasing thickness of iron scale on surface of wire rod - Google Patents
Method for increasing thickness of iron scale on surface of wire rod Download PDFInfo
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- CN111974798B CN111974798B CN202010723833.6A CN202010723833A CN111974798B CN 111974798 B CN111974798 B CN 111974798B CN 202010723833 A CN202010723833 A CN 202010723833A CN 111974798 B CN111974798 B CN 111974798B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
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- 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
- 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
- C22C38/02—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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention provides a method for improving the thickness of iron scale on the surface of a wire rod, which comprises the following steps: the following process steps are carried out in sequence: smelting blast furnace molten iron, desulfurizing and pretreating the molten iron, smelting converter molten steel, continuously casting square billets, rolling at a high speed and spinning; wherein, the process steps comprise the following specific steps: step A, reducing the content of Mn in steel, and adding a V element to ensure that the weight percentage of Mn in the HRB400E wire rod twisted steel is controlled as follows: 1.30-1.40 wt%, and the weight percentage of V is controlled as follows: 0.020-0.035 wt%; step B, controlling the finish rolling temperature to be 830-910 ℃; step C, after finish rolling and before spinning, the wire rod is in a natural cooling state; and D, on the aspect of cooling control of the stelmor roller way, at least a first heat-preserving cover of the stelmor roller way is closed, and at least a No. 1 fan is started. The invention improves the thickness of the scale of the HRB400E wire rod twisted steel.
Description
Technical Field
The invention relates to the field of steel rolling, in particular to a method for improving the thickness of iron scale on a twisted steel bar (HRB 400E steel wire rod for short) of a HRB400E steel wire rod with the specification of phi 6-12 mm, namely a method for improving the thickness of the iron scale on the surface of the steel wire rod.
Background
The corrosion problem of steel is always a hot spot concerned in the industry, and the national standard GB/T1499.2-2018 part 2 of steel for reinforced concrete: hot rolled ribbed bar "does not address the corrosion requirements of HRB400E wire rod rebar, but the rust protection capability of the rebar is also one of the concerns of users in marketing. During the rolling and later air cooling processes of the wire rod, a thin iron oxide scale layer can be naturally formed on the surface of the wire rod, and the iron oxide scale layer has a good anti-rust effect during the transportation and storage of the wire rod. The thickness and the integrity of the iron scale are positively correlated with the antirust capability of the iron scale, and the thicker the thickness is, the more complete the iron scale is, the better the antirust capability is. The conventional production method of the wire rod twisted steel uses controlled cooling after rolling to control the spinning temperature of the wire rod so as to obtain better performance, but the controlled cooling after rolling influences the thickness and integrity of an iron scale, and the thickness is only 4-5 mu m and is smaller.
In summary, the following problems exist in the prior art: the thickness of the iron scale on the surface of the wire rod is smaller.
Disclosure of Invention
The invention provides a method for increasing the thickness of scale on the surface of a wire rod, which is used for increasing the thickness of scale of a twisted steel wire rod, in particular to the thickness of scale of a twisted steel wire rod HRB 400E.
Therefore, the invention provides a method for increasing the thickness of scale on the surface of a wire rod, wherein the wire rod is HRB400E wire rod twisted steel, and the method for increasing the thickness of the scale on the surface of the wire rod comprises the following steps: the following process steps are carried out in sequence: smelting blast furnace molten iron, desulfurizing and pretreating the molten iron, smelting converter molten steel, continuously casting square billets, rolling at a high speed and spinning; wherein, the process steps comprise the following specific steps:
step A, reducing the content of Mn in steel, and adding a V element to ensure that the weight percentage of Mn in the HRB400E wire rod twisted steel is controlled as follows: 1.30-1.40 wt%, and the weight percentage of V is controlled as follows: 0.020-0.035 wt%;
step B, controlling the finish rolling temperature to be 830-910 ℃;
step C, after finish rolling and before spinning, the wire rod is in a natural cooling state;
and D, on the aspect of cooling control of the stelmor roller way, at least a first heat-preserving cover of the stelmor roller way is closed, and at least a No. 1 fan is started.
Further, according to the weight percentage, the HRB400E wire rod twisted steel comprises the following other components: c: 0.19 to 0.25 wt%, Si: 0.45-0.70 wt%, P is less than or equal to 0.040 wt%, and S is less than or equal to 0.035 wt%.
Further, the step B is controlled to the finish rolling temperature by using a controlled cooling device before finish rolling.
Furthermore, the specification of the wire rod is phi 6 wire rod twisted steel, the finish rolling temperature is controlled to be 900 +/-10 ℃, on the stelmor roller bed cooling control, the No. 1 heat-insulating cover is closed, the No. 1 fan is opened, the No. 2 heat-insulating cover is opened, and other heat-insulating covers are closed.
Further, the specification of the wire rod is phi 8 wire rod twisted steel, the finish rolling temperature is controlled to be 870 +/-10 ℃, on the stelmor roller bed cooling control, the No. 1 heat-preservation cover is closed, the No. 1-2 fan is opened, the No. 2-3 heat-preservation cover is opened, and other heat-preservation covers are closed.
Further, the specification of the wire rod is phi 10 wire rod twisted steel, the finish rolling temperature is controlled to be 840 +/-10 ℃, on the stelmor roller bed cooling control, the heat preservation cover No. 1 is closed, the fans No. 1-4 are opened, the heat preservation covers No. 2-5 are opened, and other heat preservation covers are closed.
Furthermore, the specification of the wire rod is phi 12 wire rod twisted steel, the finish rolling temperature is controlled to be 840 +/-10 ℃, and on the stelmor roller bed cooling control, the No. 1 heat-insulating cover is closed, the No. 1-5 fan is opened, the No. 2-6 heat-insulating cover is opened, and other heat-insulating covers are closed.
Further, according to the weight percentage, the HRB400E wire rod twisted steel comprises the following components: c: 0.20 wt%, Si: 0.50 wt%, P: 0.025 wt%, S: 0.020 wt%. Mn: 1.31 wt%, V: 0.023wt percent.
Further, the initial rolling temperature was 986 ℃ and the finish rolling temperature was 902 ℃.
Further, the initial rolling temperature is 975 ℃, and the finish rolling temperature is 845 ℃.
The invention comprises the following steps:
(1) the Mn is replaced by V in the component design, the addition of the V element is improved, the Mn element is reduced, and the performance fluctuation caused by overhigh spinning temperature after water controlled cooling is not needed after rolling is avoided;
(2) before finish rolling, the controlled cooling equipment is used, the low finish rolling temperature is controlled, the rolled steel rod is at a more reasonable finish rolling temperature, the grain growth phenomenon of the steel rod is controlled, and the performance is improved;
(3) after finish rolling, no cooling control equipment is installed or used, so that uneven cooling of the surface of the wire rod and damage to iron scale caused by residual water in the cooling control equipment are avoided;
(4) and closing the first heat-preserving cover of the stelmor roller way and starting the fan to enable the wire rod to be in a high-temperature oxygen-enriched environment after spinning, so that the formation of iron scales is facilitated. Therefore, the thickness of the iron scale of the HRB400E wire rod twisted steel bar with the specification of phi 6-12 mm can be increased.
Through the scheme, the thickness of the iron scale on the surface of the HRB400E wire rod twisted steel bar with the specification of phi 6-12 mm can be increased to more than 12 micrometers.
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 for improving the thickness of the iron scale on the surface of the wire rod comprises the following process routes: smelting blast furnace molten iron, desulfurizing and pre-treating the molten iron, smelting converter molten steel, continuously casting square billets, rolling at a high speed, spinning, inspecting, 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-wire rolling (6 frames each of rough rolling, medium rolling and pre-finish rolling and 10 frames of finish rolling) is adopted, cooling control equipment is used before finish rolling, and the finish rolling temperature is controlled to be 820-910 ℃. And after finish rolling, before spinning, no cooling control equipment is installed or used, so that the wire rod is in a natural cooling state.
The specific technical measures are as follows:
1. controlling components:
since Mn element can improve hardenability of steel, and excessively high Mn content increases uneven cooling of the lap point and non-lap point of the wire rod, it is desirable to properly reduce Mn content in steel, and to add V element to molten steel by nitriding ferrovanadium or vanadium-nitrogen alloy, to compensate for strength loss due to reduced Mn content. As in table 1.
TABLE 1 vanadium microalloying HRB400E composition (wt%)
| C | Si | Mn | P | S | V | |
| HRB400E | 0.19～0.25 | 0.45～0.70 | 1.30～1.40 | ≤0.040 | ≤0.035 | 0.020～0.035 |
2. And the finish rolling temperature is lowered. After finish rolling, no cooling control equipment is installed, the finishing rolling and spinning temperature is too high, austenite grains obviously grow up, and the performance is not controlled. Therefore, before finish rolling, a cooling control device is installed, the finish rolling temperature is controlled to be 830-910 ℃ according to production specification control (Table 2), and the spinning temperature is controlled to be 900-990 ℃.
3. And after finish rolling, no cooling control equipment is installed. The prior controlled cooling equipment uses water to control the temperature of the wire rod, and after finish rolling, if the controlled cooling equipment is used, the temperature of transverse ribs and longitudinal ribs of the wire rod is obviously lower than that of a base circle part, so that the distribution thickness of iron scales on the surface of the wire rod is uneven. If the cooling control equipment is installed, even if the cooling control equipment is not used, residual water can exist in the equipment to cause uneven cooling of the surface of the wire rod and damage the iron scale, so the cooling control equipment is not installed after the finish rolling, namely the wire rod does not contact water any more after the finish rolling.
4. And (5) controlling the stelmor roller way cooling. The heat-insulating cover and the fan on the stelmor roller way are determined devices, and for the prior common HRB400E wire rod twisted steel, the same stelmor roller way device comprising the heat-insulating cover and the fan is adopted, and a full or partial opening measure is adopted. In the invention, the same stelmor roller bed equipment is still adopted, but the use of the heat-insulating cover and the fan is different from the prior ordinary HRB400E wire rod twisted steel bar rolling. In the invention, after spinning, the first heat-preserving cover of the stelmor roller way is closed and the No. 1 fan is started, so that the spun wire rod is in a high-temperature oxygen-enriched environment, and the formation of iron oxide scales is facilitated. The spinning temperature and the fan opening of the specification phi 6-12 mm are shown in Table 2.
TABLE 2
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Table 3 is the composition (in weight percent) of the steels of the examples. Table 4 shows the production specifications, process parameters, mechanical properties, scale thickness 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 |
| Example 1 | 0.20 | 0.50 | 1.31 | 0.025 | 0.020 | 0.023 |
| Example 2 | 0.25 | 0.55 | 1.33 | 0.024 | 0.020 | 0.025 |
| Example 3 | 0.23 | 0.49 | 1.35 | 0.030 | 0.026 | 0.030 |
| Example 4 | 0.22 | 0.53 | 1.37 | 0.031 | 0.031 | 0.028 |
| Example 5 | 0.24 | 0.49 | 1.34 | 0.029 | 0.028 | 0.026 |
Table 4: specific process parameters and mechanical properties of the examples
As can be seen from tables 3 and 4: the method can improve the thickness of the iron scale on the surface of the HRB400E twisted steel wire rod with the specification of phi 6-12 mm to more than 12 mu m.
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 (6)
1. The method for improving the thickness of the iron scale on the surface of the wire rod is characterized in that the wire rod is HRB400E wire rod twisted steel, and the specification of the product is phi 6-12 mm; the method for improving the thickness of the iron scale on the surface of the wire rod comprises the following steps: the following process steps are carried out in sequence: smelting blast furnace molten iron, desulfurizing and pretreating the molten iron, smelting converter molten steel, continuously casting square billets, rolling high-speed wires and spinning; wherein, the process steps comprise the following specific steps:
step A, reducing the content of Mn in steel, and adding a V element to ensure that the weight percentage of Mn in the HRB400E wire rod twisted steel is controlled as follows: 1.30-1.40 wt%, V weight percentage is controlled as follows: 0.020-0.035 wt%;
step B, controlling the finish rolling temperature to be 830-880 ℃, wherein the finish rolling temperature is controlled by using a controlled cooling device before finish rolling;
step C, after finish rolling and before spinning, the wire rod is in a natural cooling state; after finishing rolling, no cooling control equipment is installed or used;
d, on the cooling control of the stelmor roller way, at least a first heat-preserving cover of the stelmor roller way is closed, and at least a No. 1 fan is started;
according to the weight percentage, other components of the HRB400E wire rod twisted steel bar are as follows: c: 0.19 to 0.25 wt%, Si: 0.45-0.70 wt%, P is less than or equal to 0.040 wt%, and S is less than or equal to 0.035 wt%;
rolling the high-speed wire rods: controlling the heating temperature of a casting blank to 1050-1170 ℃, the heating time of a billet to 80-120 minutes, the initial rolling temperature to 950-1000 ℃, adopting 28 high-speed non-twisted single-wire rolling, 6 frames of rough rolling, medium rolling and pre-finish rolling, and 10 frames of finish rolling;
by the method, the thickness of the scale on the surface of the HRB400E wire rod twisted steel bar with the specification of phi 6-12 mm can be increased to more than 12 micrometers.
2. The method for increasing the thickness of the scale on the surface of the wire rod according to claim 1, wherein the wire rod is phi 8 wire rod twisted steel, the finish rolling temperature is controlled to be 870 +/-10 ℃, on the stelmor roller bed cooling control, a No. 1 heat preservation cover is closed, No. 1 to No. 2 fans are opened, No. 2 to No. 3 heat preservation covers are opened, and other heat preservation covers are closed.
3. The method for increasing the thickness of the scale on the surface of the wire rod according to claim 1, wherein the wire rod is phi 10 wire rod twisted steel, the finish rolling temperature is controlled to be 840 +/-10 ℃, on the stelmor roller bed cooling control, a No. 1 heat preservation cover is closed, No. 1 to No. 4 fans are opened, No. 2 to No. 5 heat preservation covers are opened, and other heat preservation covers are closed.
4. The method for improving the thickness of the iron scale on the surface of the wire rod according to claim 1, wherein the wire rod is a phi 12 wire rod twisted steel, the finish rolling temperature is controlled to be 840 +/-10 ℃, and on the stelmor roller bed cooling control, a No. 1 heat-insulating cover is closed, a No. 1 fan is opened to a No. 5 fan, a No. 2 heat-insulating cover is opened to a No. 6 heat-insulating cover, and other heat-insulating covers are closed.
5. The method for increasing the thickness of the scale on the surface of the wire rod as claimed in claim 1, wherein the HRB400E twisted steel wire rod comprises the following components in percentage by weight: c: 0.20 wt%, Si: 0.50 wt%, P: 0.025 wt%, S: 0.020 wt%, Mn: 1.31 wt%, V: 0.023wt percent.
6. The method for increasing the thickness of iron scale on the surface of a wire rod according to claim 4, wherein the initial rolling temperature is 975 ℃ and the finish rolling temperature is 845 ℃.
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| CN115971241A (en) * | 2021-02-24 | 2023-04-18 | 广西柳钢华创科技研发有限公司 | Production method of HRB400E straight twisted steel |
| CN113042545B (en) * | 2021-03-12 | 2022-03-01 | 中天钢铁集团有限公司 | Generation control method of disc-screw iron scale with layered structure |
| CN115652178B (en) * | 2021-07-06 | 2023-07-14 | 广西柳钢华创科技研发有限公司 | High-speed wire rod screw steel with small same-circle strength fluctuation difference and surface oxide scale thickness of more than 10 mu m |
| 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 |
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