CN114182158A - Preparation method of deformed steel bar with short-distance graded cooling control and cost reduction - Google Patents

Preparation method of deformed steel bar with short-distance graded cooling control and cost reduction Download PDF

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CN114182158A
CN114182158A CN202111232055.1A CN202111232055A CN114182158A CN 114182158 A CN114182158 A CN 114182158A CN 202111232055 A CN202111232055 A CN 202111232055A CN 114182158 A CN114182158 A CN 114182158A
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short
temperature
cooling
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distance
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程维玮
朱守欣
梁治国
邹翔宇
柳国徽
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Nanjing Iron and Steel Co Ltd
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Nanjing Iron and Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • 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
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • 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
    • 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
    • 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention discloses a preparation method of a screw-thread steel with short-distance graded cooling control and cost reduction, which relates to the technical field of steel production, and is characterized in that the terminal sulfur of a converter is controlled to be less than or equal to 0.030 percent, the terminal phosphorus is controlled to be less than or equal to 0.030 percent, and the tapping temperature is controlled to be greater than or equal to 1620 ℃; adopting a red ladle and slag-stopping tapping, wherein the tapping time is more than or equal to 150 s; when tapping to 1/3, adding deoxidizer and alloy according to the end point condition for deoxidation alloying, adding the alloy according to the target value of the components, and simultaneously adding 60-70kg of composite vanadium-nitrogen alloy into each furnace; controlling the furnace temperature of a preheating section to be 500-1000 ℃, the furnace temperature of a heating section to be 950-1120 ℃ and the furnace temperature of a soaking section to be 1050-1120 ℃; and (3) controlling the temperature of the upper cooling bed to be 790-830 ℃ by adopting a short-distance sectional cooling control mode. The method is used for reinforced concrete structures of civil buildings, roads, bridges, tunnels and the like, has good performance in downstream customer detection and test, and completely meets the use requirements of customers.

Description

Preparation method of deformed steel bar with short-distance graded cooling control and cost reduction
Technical Field
The invention relates to the technical field of steel production, in particular to a method for preparing a screw steel with short-distance grading, cooling control and cost reduction.
Background
11/1/2018, GB/T1499.2-2018 Steel for reinforced concrete part 2: after the new national standard is implemented, the hot-rolled ribbed steel bar requires that the structure mainly comprises ferrite and pearlite, and tempered martensite cannot appear on a base circle. Therefore, the low-cost process of adding about 0.020% of vanadium and carrying out weak water penetration is changed from the original process of adding no precious vanadium alloy and carrying out strong water penetration cooling on 400 MPa-grade deformed steel. However, in order to pursue lower cost, some steel mills adopt a mode of graded cooling control after rolling to further increase the cooling strength after rolling, improve the strength of finished products and reduce the vanadium content, and some steel mills directly and newly put into production lines of deformed steel bars with strong rolling control and cooling control capacity, and the vanadium content of deformed steel bars with the specification of phi 20 produced by the production lines can be reduced to about 0.010 percent. At present, part of deformed steel bar production lines are old factories built in the 70 s, the length of a factory building is less than 300 meters, the installation length of a front and back water passing device for graded cooling control after normal rolling is at least more than 40 meters, the distance from a finished product rolling mill to a flying shear of the production line is only about 21 meters, and a different graded cooling control process after rolling needs to be adopted to increase the cooling strength after rolling, improve the strength of a finished product and reduce the content of vanadium, namely, a set of segmented cooling control device needs to be arranged at a short distance of 21 meters from the finished product rolling mill to the flying shear, and meanwhile, the water passing process cannot influence the normal work of the flying shear.
Disclosure of Invention
Aiming at the technical problems, the invention overcomes the defects of the prior art and provides a preparation method of the screw-thread steel with short-distance graded cooling control and cost reduction, and the production process comprises the following steps: 120t converter → nitrogen blowing and stirring → full protection continuous casting production → casting blank cooling → casting blank inspection → heating → descaling → rolling → short-distance segmented cooling → finished product inspection → packaging → identification → warehousing, and the short-distance segmented cooling control process after smelting, heating and rolling is controlled as follows:
controlling the end point sulfur of the converter to be less than or equal to 0.030 percent, the end point phosphorus to be less than or equal to 0.030 percent and the tapping temperature to be more than or equal to 1620 ℃; adopting a red ladle and slag-stopping tapping, wherein the tapping time is more than or equal to 150 s; when tapping to 1/3, adding deoxidizer and alloy according to the end point condition for deoxidation alloying, adding the alloy according to the target value of the components, and simultaneously adding 60-70kg of composite vanadium-nitrogen alloy into each furnace;
controlling the furnace temperature of a preheating section to be 500-1000 ℃, the furnace temperature of a heating section to be 950-1120 ℃ and the furnace temperature of a soaking section to be 1050-1120 ℃;
and (3) controlling the temperature of the upper cooling bed to be 790-830 ℃ by adopting a short-distance sectional cooling control mode.
The technical scheme of the invention is further defined as follows:
the preparation method of the threaded steel with the short-distance graded cooling control and the cost reduction comprises the following chemical components in percentage by mass: c: 0.22-0.25%, Mn: 1.30% -1.60%, Si: 0.40-0.60%, P is less than or equal to 0.045%, S is less than or equal to 0.045%, V: 0.010% -0.025%, N: 0.0070-0.0150% of the total weight of the alloy, and the balance of Fe and inevitable impurities.
The preparation method of the threaded steel with the short-distance graded cooling control and the reduced cost comprises the following steps of: c: 0.23-0.25%, Mn: 1.33% -1.45%, Si: 0.41-0.50%, P: 0.018-0.035%, S: 0.011% -0.028%, V: 0.014% -0.020%, N: 0.0081-0.0125 percent, and the balance of Fe and inevitable impurities.
According to the preparation method of the short-distance graded cold-control and cost-reduction thread steel, according to the designed chemical components, the BOF + nitrogen-blowing stirring method is adopted for smelting, and the tapping temperature is actually controlled at 1628-1650 ℃, P is less than or equal to 0.029%, and S is less than or equal to 0.026% at the end point. Adopting a red ladle and slag-stopping tapping, wherein the tapping time is more than or equal to 212 s; when tapping to 1/3, adding deoxidizer and alloy according to the end point condition for deoxidation alloying, adding the alloy according to the target value of the components, and adding 65kg of composite vanadium-nitrogen alloy into each furnace; and measuring the temperature and sampling after the nitrogen is blown into the molten steel for 3 minutes, carrying out fine adjustment according to the components of the molten steel, and keeping the total nitrogen blowing time after the furnace to be more than 6 minutes.
The preparation method of the deformed steel bar with the short-distance grading and controlled cooling functions has the advantages that the continuous casting tundish uses a low-carbon covering agent or carbonized rice hulls, and the superheat degree is 20-30 ℃; the crystallizer uses special covering slag for deformed steel bar, and the pulling speed is 2.90-3.07 m/min.
The preparation method of the thread steel with the short-distance graded cooling control and the cost reduction comprises the steps of controlling the furnace temperature of a preheating section to be 600-870 ℃, the furnace temperature of a heating second-stage furnace to be 967-1090 ℃, the furnace temperature of a soaking section to be 1095-1118 ℃, and the initial rolling temperature to be 1010-1060 ℃; during production, the cooling water system is provided with a booster pump in addition to a normal water pump, a first section of a water penetrating pipe is opened, the water pressure is 14-17 kg, a second section is closed, a second section is fully closed, a third section is closed, a second section is opened, the water pressure is 12-15 kg, and the temperature of an upper cooling bed is 790-830 ℃; during production, the water pressure of the water passing pipe can be finely adjusted according to the temperature of the upper cooling bed.
The preparation method of the deformed steel bar with the short-distance graded cooling control and the reduced cost adopts the low heating temperature and short-distance graded cooling control process to produce the HRB400 and HRB400E straight deformed steel bars with the specification of phi 14-phi 25 mm.
The invention has the beneficial effects that: the method comprises the production process control of the short-distance segmented cooling control process after heating and rolling, the V content of the 400 MPa-grade straight thread steel can be reduced from 0.018-0.030% to 0.010-0.025% through the control, the consumption of vanadium-nitrogen alloy can be reduced by about 0.064kg per ton of steel, and the cost of the steel can be reduced by about 10 yuan per ton of steel.
Drawings
FIG. 1 is a schematic view of the distribution of the sectional controlled cooling water test tubes of the present invention;
FIG. 2 is a closed loop of the original continuous through water cooling process;
FIG. 3 shows the present invention without a closed loop.
Detailed Description
The method for preparing the threaded steel with the short-distance graded cooling control and the reduced cost provided by the embodiment comprises the following production processes: 120t converter → nitrogen blowing and stirring → full protection continuous casting production → casting blank cooling → casting blank inspection → heating → descaling → rolling → short-distance segmented cooling → finished product inspection → packaging → marking → warehousing, and the HRB400 and HRB400E straight thread steel with the specification of phi 14-phi 25mm is produced.
According to the designed chemical components, a BOF + nitrogen blowing stirring method is adopted for smelting, and the tapping temperature is actually controlled at the end point to be 1628-1650 ℃, P is less than or equal to 0.029%, and S is less than or equal to 0.026%. Adopting a red ladle and slag-stopping tapping, wherein the tapping time is more than or equal to 212 s; when tapping to 1/3, adding deoxidizer and alloy according to the end point condition for deoxidation alloying, adding the alloy according to the target value of the components, and adding 65kg of composite vanadium-nitrogen alloy into each furnace; measuring the temperature and sampling after blowing nitrogen for 3 minutes, carrying out fine adjustment according to the components of the molten steel, and keeping the total nitrogen blowing time after the furnace to be more than 6 minutes;
a low-carbon covering agent or carbonized rice hulls are used in the continuous casting tundish, and the superheat degree is 20-30 ℃; the crystallizer uses special covering slag for deformed steel bar, and the pulling speed is 2.90-3.07 m/min;
controlling the furnace temperature of a preheating section to be 600-870 ℃, the furnace temperature of a heating second-stage furnace to be 967-1090 ℃, the furnace temperature of a soaking section to be 1095-1118 ℃, and the start rolling temperature to be 1010-1060 ℃; as shown in figure 1, during production, a cooling water system is provided with a booster pump besides a normal water pump, a first section of a water penetrating pipe is opened, the water pressure is 14-17 kg, a second section is closed, a second section is fully closed, a third section is closed, a second section is opened, the water pressure is 12-15 kg, and the temperature of an upper cooling bed is 790-830 ℃; during production, the water pressure of the water passing pipe can be finely adjusted according to the temperature of the upper cooling bed.
The chemical component requirements before and after the invention is adopted and the actual production of the 400 MPa-level straight thread steel are shown in the table 1:
TABLE 1 chemical composition requirements before and after the present invention and melting composition (wt%) actually produced by the present invention
Numbering C Si Mn P S V N
The front requirements of the invention 0.22~0.25 0.40~0.60 1.30~1.60 ≤0.045 ≤0.045 0.016~0.030 0,0070~0,0150
The present invention is claimed 0.22~0.25 0.40~0.60 1.30~1.60 ≤0.045 ≤0.045 0.010~0.025 0,0070~0,0150
Practice of 0.23~0.25 0.41~0.50 1.33~1.45 0.018~0.035 0.011~0.028 0.014~0.020 0.0081~0.0125
The specific physical and chemical properties of the 400 MPa-level straight-strip deformed steel produced by adopting the segmented controlled cooling process are shown in the table 2:
TABLE 2 physical and chemical properties range of 400 MPa-grade straight-bar deformed steel bar produced by the invention
Figure DEST_PATH_IMAGE001
The typical low power of the 400 MPa-level straight thread steel produced by the sectional controlled cooling process is as shown in the figure: FIG. 2 shows that when the temperature of an upper cooling bed is reduced from 820-860 ℃ to 790-830 ℃ by adopting the original continuous through water cooling device, the edge of the deformed steel bar has an obvious closed ring, and FIG. 3 shows that the deformed steel bar finished product produced by the modified segmented controlled cooling device has low power, no closed ring is found, and no quenching structure is found.
In conclusion, the method is mainly used for improving the yield strength of the HRB400 deformed steel bar, and is suitable for the deformed steel bar production line which is constructed in the last century and has shorter length. After the invention is applied, the yield strength of HRB400 can be improved by about 10-15MPa, and correspondingly, the manganese content can be reduced by about 0.10 percent or the vanadium content can be reduced by about 0.005 percent. The cost can be reduced by about 10 yuan calculated according to the current ferromanganese alloy or vanadium-nitrogen alloy price, and the cost can be reduced by 1000 yuan per year when the annual yield HRB400 deformed steel bar is calculated by 100 ten thousand tons.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.

Claims (7)

1. A preparation method of a short-distance graded cold-control and cost-reducing thread steel is characterized by comprising the following steps: the production process comprises the following steps: 120t converter → nitrogen blowing and stirring → full protection continuous casting production → casting blank cooling → casting blank inspection → heating → descaling → rolling → short-distance segmented cooling → finished product inspection → packaging → identification → warehousing, and the short-distance segmented cooling control process after smelting, heating and rolling is controlled as follows:
controlling the end point sulfur of the converter to be less than or equal to 0.030 percent, the end point phosphorus to be less than or equal to 0.030 percent and the tapping temperature to be more than or equal to 1620 ℃; adopting a red ladle and slag-stopping tapping, wherein the tapping time is more than or equal to 150 s; when tapping to 1/3, adding deoxidizer and alloy according to the end point condition for deoxidation alloying, adding the alloy according to the target value of the components, and simultaneously adding 60-70kg of composite vanadium-nitrogen alloy into each furnace;
controlling the furnace temperature of a preheating section to be 500-1000 ℃, the furnace temperature of a heating section to be 950-1120 ℃ and the furnace temperature of a soaking section to be 1050-1120 ℃;
and (3) controlling the temperature of the upper cooling bed to be 790-830 ℃ by adopting a short-distance sectional cooling control mode.
2. The method for preparing the short-distance graded cooling-control cost-reduced screw-thread steel according to claim 1, is characterized in that: the chemical components and the mass percentage are as follows: c: 0.22-0.25%, Mn: 1.30% -1.60%, Si: 0.40-0.60%, P is less than or equal to 0.045%, S is less than or equal to 0.045%, V: 0.010% -0.025%, N: 0.0070-0.0150% of the total weight of the alloy, and the balance of Fe and inevitable impurities.
3. The method for preparing the short-distance graded cooling-control cost-reduced screw-thread steel according to claim 2, is characterized in that: the actual control chemical components and the mass percentage are as follows: c: 0.23-0.25%, Mn: 1.33% -1.45%, Si: 0.41-0.50%, P: 0.018-0.035%, S: 0.011% -0.028%, V: 0.014% -0.020%, N: 0.0081-0.0125 percent, and the balance of Fe and inevitable impurities.
4. The method for preparing the short-distance graded cooling-control cost-reduced screw-thread steel according to claim 1, is characterized in that: according to the designed chemical components, a BOF + nitrogen blowing stirring method is adopted for smelting, and the tapping temperature is actually controlled at the end point to be 1628-1650 ℃, P is less than or equal to 0.029%, and S is less than or equal to 0.026%. Adopting a red ladle and slag-stopping tapping, wherein the tapping time is more than or equal to 212 s; when tapping to 1/3, adding deoxidizer and alloy according to the end point condition for deoxidation alloying, adding the alloy according to the target value of the components, and adding 65kg of composite vanadium-nitrogen alloy into each furnace; and measuring the temperature and sampling after the nitrogen is blown into the molten steel for 3 minutes, carrying out fine adjustment according to the components of the molten steel, and keeping the total nitrogen blowing time after the furnace to be more than 6 minutes.
5. The method for preparing the short-distance graded cooling-control cost-reduced screw-thread steel according to claim 4, is characterized in that: a low-carbon covering agent or carbonized rice hulls are used in the continuous casting tundish, and the superheat degree is 20-30 ℃; the crystallizer uses special covering slag for deformed steel bar, and the pulling speed is 2.90-3.07 m/min.
6. The method for preparing the short-distance graded cooling-control cost-reduced screw-thread steel according to claim 5, is characterized in that: controlling the furnace temperature of a preheating section to be 600-870 ℃, the furnace temperature of a heating second-stage furnace to be 967-1090 ℃, the furnace temperature of a soaking section to be 1095-1118 ℃, and the start rolling temperature to be 1010-1060 ℃; during production, the cooling water system is provided with a booster pump in addition to a normal water pump, a first section of a water penetrating pipe is opened, the water pressure is 14-17 kg, a second section is closed, a second section is fully closed, a third section is closed, a second section is opened, the water pressure is 12-15 kg, and the temperature of an upper cooling bed is 790-830 ℃; during production, the water pressure of the water passing pipe can be finely adjusted according to the temperature of the upper cooling bed.
7. The method for preparing the short-distance graded cooling-control cost-reduced screw-thread steel according to claim 1, is characterized in that: HRB400 and HRB400E straight-bar deformed steel bars with specifications of phi 14-phi 25mm are produced by adopting a low heating temperature and short-distance sectional cooling control process.
CN202111232055.1A 2021-10-22 2021-10-22 Preparation method of deformed steel bar with short-distance graded cooling control and cost reduction Pending CN114182158A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110408843A (en) * 2019-08-13 2019-11-05 南京钢铁股份有限公司 A kind of 500Mpa grades of coiling reinforcing bar and preparation method thereof
CN111004980A (en) * 2020-01-11 2020-04-14 武钢集团昆明钢铁股份有限公司 Preparation method of vanadium-chromium microalloyed large-sized superfine-crystal high-toughness corrosion-resistant anti-seismic reinforcing steel bar

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110408843A (en) * 2019-08-13 2019-11-05 南京钢铁股份有限公司 A kind of 500Mpa grades of coiling reinforcing bar and preparation method thereof
CN111004980A (en) * 2020-01-11 2020-04-14 武钢集团昆明钢铁股份有限公司 Preparation method of vanadium-chromium microalloyed large-sized superfine-crystal high-toughness corrosion-resistant anti-seismic reinforcing steel bar

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
曹树卫等: "穿水冷却工艺对HRB400热轧带肋钢筋性能的影响", 《钢铁研究》 *
王贺龙等: "HRB400热轧带肋钢筋轧后控冷工艺生产实践", 《热加工工艺》 *
许磊等: "热轧HRB400螺纹钢筋降钒生产工艺研究", 《热加工工艺》 *

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Application publication date: 20220315