CN113637918A - Titanium alloying HRB400E hot-rolled ribbed steel bar and manufacturing method thereof - Google Patents
Titanium alloying HRB400E hot-rolled ribbed steel bar and manufacturing method thereof Download PDFInfo
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- CN113637918A CN113637918A CN202110958234.7A CN202110958234A CN113637918A CN 113637918 A CN113637918 A CN 113637918A CN 202110958234 A CN202110958234 A CN 202110958234A CN 113637918 A CN113637918 A CN 113637918A
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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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- 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
- 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
- B21B1/46—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 metal immediately subsequent to continuous casting
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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
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
- C22C38/60—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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Abstract
The application provides a titanium alloying HRB400E hot-rolled ribbed steel bar and a manufacturing method thereof, wherein the HRB400E hot-rolled ribbed steel bar comprises the following components in percentage by weight: c: 0.18% -0.25%, Si: 0.10-0.80%, Mn: 0.40-1.30%, Ti: 0.055% -0.13%, P: 0-0.045%, S: 0-0.045%, the balance being Fe and inevitable impurity, on the basis of the traditional HRB400E hot rolling process, the scheme utilizes Ti microalloying, is assisted by controlled rolling and controlled cooling technology, improves the mechanical property of the steel bar through fine grain strengthening, and can effectively reduce the addition of Mn element. The fine grain strengthening effect of Ti carbonitride for inhibiting austenite grain growth at high temperature is utilized, so that the performance fluctuation correlation caused by molten steel component fluctuation is reduced, the requirements of mechanical properties on billet heating temperature, heat preservation time, finish rolling temperature and post-rolling cooling rate in the hot rolling process are reduced, the requirements on the capacity of smelting equipment and rolling equipment are reduced, the production cost is effectively reduced, and the production efficiency is improved.
Description
Technical Field
The application relates to the technical field of metallurgy, in particular to a titanium alloying HRB400E hot-rolled ribbed steel bar and a manufacturing method thereof.
Background
In the production of the traditional HRB400E hot-rolled ribbed steel bar, the fine grain strengthening is realized by adding vanadium-nitrogen alloy, the solid solution strengthening is realized by adding Mn element, the mass fraction of the added V is about 0.02-0.04%, and the mass fraction of the Mn is about 1.3-1.7%. However, the mechanical properties of the product fluctuate greatly due to the influence of the rolling process, cooling means and climate environment changes. The main reason is that Mn belongs to hardenability elements, and when a large amount of Mn element is added into steel, the dynamic cooling CCT curve moves towards the lower right. Especially the fluctuation of the cooling process after rolling, changes the microstructure state and proportion, and finally leads to the fluctuation of mechanical properties. In addition, the deformation degree of the super-cooled austenite plays a certain role in inducing phase transformation, and the influence of different deformation amounts and cooling rate differences after rolling on the composition and proportion of a microstructure plays a key role in the mechanical property of the hot-rolled ribbed steel bar. The interference of the factors on the mechanical property can be avoided by properly reducing the Mn content and the hardenability of the steel. However, when the Mn element is reduced, the solid solution strengthening effect is weakened, which easily causes the product mechanical property to be unqualified, and the product mechanical property needs to be compensated by other mechanisms.
In the production of the traditional HRB400E hot-rolled ribbed steel bar, fine grain strengthening is realized by adding vanadium-nitrogen alloy and ferrocolumbium, solid solution strengthening is realized by adding Mn element, the mass fraction of the added vanadium is about 0.02-0.04%, and the mass fraction of the added niobium is about 0.01-0.02%. Meanwhile, the production efficiency is low due to the fact that more oxidation burning loss is generated in the production process.
Disclosure of Invention
In order to overcome the problems in the prior art, the application provides the titanium alloyed HRB400E hot-rolled ribbed steel bar and the manufacturing method thereof, on the basis of the traditional HRB400E hot rolling process, the content of noble alloys such as vanadium-nitrogen alloy, ferroniobium and the like is reduced by properly increasing the content of Ti in steel, meanwhile, the content of silicon-manganese alloy can be reduced, the cost is saved, and the production efficiency is improved.
In a first aspect, the present application provides a titanium alloyed HRB400E hot-rolled ribbed steel bar, the HRB400E hot-rolled ribbed steel bar comprising the following components in percentage by weight: c: 0.18% -0.25%, Si: 0.10-0.80%, Mn: 0.40-1.30%, Ti: 0.055% -0.13%, P: 0-0.045%, S: 0 to 0.045%, and the balance of Fe and inevitable impurities.
On the other hand, the application provides a manufacturing method of the titanium alloyed HRB400E hot-rolled ribbed steel bar, which is applied to the titanium alloyed HRB400E hot-rolled ribbed steel bar and comprises the following steps:
smelting in a converter: the process is 100t converter smelting, and the percentage content of the end-point components is controlled as follows: 0.18% -0.25%, P: 0-0.045%, the end point temperature is 1630-1660 ℃, then a deoxidizing agent and silicon and manganese alloy are added, slag washing materials are added in the tapping process for desulfurization and deoxidation, the converter slag alkalinity is controlled to be 2.5-4.0, the end point oxygen level is controlled to be below 450ppm, argon is blown into the bottom of a ladle, and after tapping is finished, the argon hanging ladle is closed to enter an LF refining process;
LF refining: after the ladle reaches the refining position, the slag is melted by heating, ferrotitanium is added according to the component requirement for component adjustment, argon is blown in the whole process, refining station entering temperature measurement is carried out, direct lower electrode refining is carried out after feeding, the adding amount of fluorite is 50-100 kg, the alkalinity control target is 2.0, if desulfurization frequency is not required: 150kg of lime (lime is added according to 6.5kg/t and contains converter top slag), 50-100 kg of fluorite and 100kg of silica are added before the electricity is supplied for the 1 st time, and the desulfurization heat is required: adding 200kg of lime (adding lime according to 7.0kg/t and containing converter top slag), 50-100 kg of fluorite and 100kg of silica before the 1 st feeding, controlling the slag melting and feeding time to be 5-8min, blowing for 1-2 minutes at each time of starting the electrode, measuring the temperature and sampling, normally refining the electrode after turning over, and finely adjusting the components according to the sampling components; the desulfurization heat is needed, 5-20kg of silicon carbide is added into the furnace, and slag formation is carried out in small batches in batches, wherein the slag formation is not too deep; controlling the refining period to be less than 35min, controlling the total power supply time to be 8-15min, and controlling the soft blowing time to be 3-8 min; the N content is controlled below 40ppm, the S content is controlled below 0.02, and the total oxygen content is controlled below 25 ppm.
Continuous casting: the continuous casting is carried out by protecting and pouring the submerged nozzle of the crystallizer, and the pulling speed is controlled to be 2.6-3.3 m/min;
heating; the temperature of furnace gas in the soaking section is 1100-1200 ℃;
rolling and cooling: the rolling is carried out according to a non-controlled cooling mode, and water cooling is not carried out during the rolling process and after the rolling process.
Optionally, in the LF refining process, if the slag fluidity is poor after slagging, a small amount of fluorite can be added, and the addition amount is not more than 40 kg.
According to the technical scheme, the application provides the titanium alloyed HRB400E hot-rolled ribbed steel bar and the manufacturing method thereof, wherein the HRB400E hot-rolled ribbed steel bar comprises the following components in percentage by weight: c: 0.18% -0.25%, Si: 0.10-0.80%, Mn: 0.40-1.30%, Ti: 0.055% -0.13%, P: 0-0.045%, S: 0-0.045%, the balance being Fe and inevitable impurity, on the basis of the traditional HRB400E hot rolling process, the scheme utilizes Ti microalloying, is assisted by controlled rolling and controlled cooling technology, improves the mechanical property of the steel bar through fine grain strengthening, and can effectively reduce the addition of Mn element. The fine grain strengthening effect of Ti carbonitride for inhibiting austenite grain growth at high temperature is utilized, so that the performance fluctuation correlation caused by molten steel component fluctuation is reduced, the requirements of mechanical properties on billet heating temperature, heat preservation time, finish rolling temperature and post-rolling cooling rate in the hot rolling process are reduced, the requirements on the capacity of smelting equipment and rolling equipment are reduced, the production cost is effectively reduced, and the production efficiency is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a flow chart of a titanium alloyed HRB400E hot rolled ribbed bar and a method of making the same as shown in the present application.
Detailed Description
In the production of the traditional HRB400E hot-rolled ribbed steel bar, the fine grain strengthening is realized by adding vanadium-nitrogen alloy, the solid solution strengthening is realized by adding Mn element, the mass fraction of the added V is about 0.02-0.04%, and the mass fraction of the Mn is about 1.3-1.7%. However, the mechanical properties of the product fluctuate greatly due to the influence of the rolling process, cooling means and climate environment changes. The main reason is that Mn belongs to hardenability elements, and when a large amount of Mn element is added into steel, the dynamic cooling CCT curve moves towards the lower right. Especially the fluctuation of the cooling process after rolling, changes the microstructure state and proportion, and finally leads to the fluctuation of mechanical properties. In addition, the deformation degree of the super-cooled austenite plays a certain role in inducing phase transformation, and the influence of different deformation amounts and cooling rate differences after rolling on the composition and proportion of a microstructure plays a key role in the mechanical property of the hot-rolled ribbed steel bar.
The interference of the factors on the mechanical property can be avoided by properly reducing the Mn content and the hardenability of the steel. However, when the Mn element is reduced, the solid solution strengthening effect is weakened, which easily causes the product mechanical property to be unqualified, and the product mechanical property needs to be compensated by other mechanisms. Ti is combined with C, N in molten steel, and the produced carbo-nitride containing Ti has no functions of tissue austenite grain growth and delayed recrystallization, can obviously refine microstructure and has fine grain strengthening effect. The fine grain strengthening effect of Ti is better than that of vanadium-nitrogen alloy, and the cost is lower; the solid solution strengthening of Mn is replaced by fine crystal strengthening of Ti, so that the influence of rolling and cooling processes on mechanical properties can be weakened, and the cost can be obviously reduced. By adding 0.06% -0.08% of Ti to replace 0.6% -1.0% of silicon-manganese alloy and 0.02% -0.03% of vanadium-nitrogen alloy, cost saving of 30-40 yuan/ton can be realized.
In the production of the traditional HRB400E hot-rolled ribbed steel bar, fine grain strengthening is realized by adding vanadium-nitrogen alloy and ferrocolumbium, solid solution strengthening is realized by adding Mn element, the mass fraction of the added vanadium is about 0.02-0.04%, the mass fraction of the added niobium is about 0.01-0.02%, and the fine grain strengthening and precipitation strengthening effects of the vanadium-nitrogen alloy and ferrocolumbium are replaced by titanium, so that the soaking temperature and the in-furnace time can be reduced, the oxidation burning loss is reduced, the production efficiency can be greatly improved, and the cost saving of 30-40 yuan/ton can be realized.
The reserves of niobium and vanadium in China are not rich, the reserve of titanium is much higher than that of niobium and vanadium, and the titanium is fully utilized to replace vanadium and niobium, so that the long-term stable development of iron and steel enterprises is facilitated.
The embodiment of the application provides a titanium alloying HRB400E hot-rolled ribbed steel bar and a manufacturing method thereof, the method comprises the steps of converter smelting, LF refining, continuous casting, heating, rolling and cooling, and on the basis of the traditional HRB400E hot rolling process, the content of noble alloys such as vanadium-nitrogen alloy, ferroniobium and the like is reduced by properly improving the content of Ti in steel, meanwhile, the content of silicon-manganese alloy is reduced, the production cost is effectively reduced, and the production efficiency is improved.
In a first aspect, the present application provides a titanium alloyed HRB400E hot-rolled ribbed steel bar, the HRB400E hot-rolled ribbed steel bar comprising the following components in percentage by weight: c: 0.18% -0.25%, Si: 0.10-0.80%, Mn: 0.40-1.30%, Ti: 0.055% -0.13%, P: 0-0.045%, S: 0 to 0.045%, and the balance of Fe and inevitable impurities.
The application substitutes titanium for the fine-grain strengthening and precipitation strengthening effects of vanadium-nitrogen alloy and ferrocolumbium, and the specific requirements of chemical components are shown in table 1;
watch 1
On the other hand, the application provides a manufacturing method of the titanium alloyed HRB400E hot-rolled ribbed steel bar, which is applied to the titanium alloyed HRB400E hot-rolled ribbed steel bar and comprises the following steps:
smelting in a converter: the process is 100t converter smelting, and the percentage content of the end-point components is controlled as follows: 0.18% -0.25%, P: 0-0.045%, the end point temperature is 1630-1660 ℃, then a deoxidizing agent and silicon and manganese alloy are added, slag washing materials are added in the tapping process for desulfurization and deoxidation, the converter slag alkalinity is controlled to be 2.5-4.0, the end point oxygen level is controlled to be below 450ppm, argon is blown into the bottom of a ladle, and after tapping is finished, the argon hanging ladle is closed to enter an LF refining process;
LF refining: after the ladle reaches the refining position, the slag is melted by heating, ferrotitanium is added according to the component requirement for component adjustment, argon is blown in the whole process, refining station entering temperature measurement is carried out, direct lower electrode refining is carried out after feeding, the adding amount of fluorite is 50-100 kg, the alkalinity control target is 2.0, if desulfurization frequency is not required: 150kg of lime (lime is added according to 6.5kg/t and contains converter top slag), 50-100 kg of fluorite and 100kg of silica are added before the electricity is supplied for the 1 st time, and the desulfurization heat is required: adding 200kg of lime (adding lime according to 7.0kg/t and containing converter top slag), 50-100 kg of fluorite and 100kg of silica before the 1 st feeding, controlling the slag melting and feeding time to be 5-8min, blowing for 1-2 minutes at each time of starting the electrode, measuring the temperature and sampling, normally refining the electrode after turning over, and finely adjusting the components according to the sampling components; the desulfurization heat is needed, 5-20kg of silicon carbide is added into the furnace, and slag formation is carried out in small batches in batches, wherein the slag formation is not too deep; controlling the refining period to be less than 35min, controlling the total power supply time to be 8-15min, and controlling the soft blowing time to be 3-8 min; the N content is controlled below 40ppm, the S content is controlled below 0.02, and the total oxygen content is controlled below 25 ppm.
Continuous casting: the continuous casting is carried out by protecting and pouring the submerged nozzle of the crystallizer, and the pulling speed is controlled to be 2.6-3.3 m/min;
heating; the temperature of furnace gas in the soaking section is 1100-1200 ℃;
rolling and cooling: the rolling is carried out according to a non-controlled cooling mode, and water cooling is not carried out during the rolling process and after the rolling process.
Optionally, in the LF refining process, if the slag fluidity is poor after slagging, a small amount of fluorite can be added, and the addition amount is not more than 40 kg.
Compared with the prior art, the titanium alloying HRB400E hot-rolled ribbed steel bar and the manufacturing method thereof are characterized in that titanium and iron are added in LF furnace refining for titanium alloying treatment. The titanium element alloying is adopted to replace the composite micro-alloying production process, so that the comprehensive cost of micro-alloying is reduced, and the low-cost stable and sustainable production of the hot-rolled ribbed steel bar is realized. The diameter of the HRB400E hot-rolled ribbed steel bar is 8-32 mm, the yield strength (internal control standard) Rel at normal temperature is more than or equal to 420MPa, the tensile strength Rm is more than or equal to 560MPa, the yield ratio Rm/Rel is more than or equal to 1.25, and martensite and bainite do not appear in a metallographic structure.
According to the technical scheme, the application provides the titanium alloyed HRB400E hot-rolled ribbed steel bar and the manufacturing method thereof, wherein the HRB400E hot-rolled ribbed steel bar comprises the following components in percentage by weight: c: 0.18% -0.25%, Si: 0.10-0.80%, Mn: 0.40-1.30%, Ti: 0.055% -0.13%, P: 0-0.045%, S: 0-0.045%, the balance being Fe and inevitable impurity, on the basis of the traditional HRB400E hot rolling process, the scheme utilizes Ti microalloying, is assisted by controlled rolling and controlled cooling technology, improves the mechanical property of the steel bar through fine grain strengthening, and can effectively reduce the addition of Mn element. The fine grain strengthening effect of Ti carbonitride for inhibiting austenite grain growth at high temperature is utilized, so that the performance fluctuation correlation caused by molten steel component fluctuation is reduced, the requirements of mechanical properties on billet heating temperature, heat preservation time, finish rolling temperature and post-rolling cooling rate in the hot rolling process are reduced, the requirements on the capacity of smelting equipment and rolling equipment are reduced, the production cost is effectively reduced, and the production efficiency is improved.
Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (3)
1. The titanium alloyed HRB400E hot-rolled ribbed steel bar is characterized in that the HRB400E hot-rolled ribbed steel bar comprises the following components in percentage by weight: c: 0.18% -0.25%, Si: 0.10-0.80%, Mn: 0.40-1.30%, Ti: 0.055% -0.13%, P: 0-0.045%, S: 0 to 0.045%, and the balance of Fe and inevitable impurities.
2. A method for manufacturing a titanium alloyed HRB400E hot rolled ribbed steel bar, applied to the titanium alloyed HRB400E hot rolled ribbed steel bar of claim 1, characterized by comprising the steps of:
smelting in a converter: the process is 100t converter smelting, and the percentage content of the end-point components is controlled as follows: 0.18% -0.25%, P: 0-0.045%, the end point temperature is 1630-1660 ℃, then a deoxidizing agent and silicon and manganese alloy are added, slag washing materials are added in the tapping process for desulfurization and deoxidation, the converter slag alkalinity is controlled to be 2.5-4.0, the end point oxygen level is controlled to be below 450ppm, argon is blown into the bottom of a ladle, and after tapping is finished, the argon hanging ladle is closed to enter an LF refining process;
LF refining: after the ladle reaches the refining position, the slag is melted by heating, ferrotitanium is added according to the component requirement for component adjustment, argon is blown in the whole process, refining station entering temperature measurement is carried out, direct lower electrode refining is carried out after feeding, the adding amount of fluorite is 50-100 kg, the alkalinity control target is 2.0, if desulfurization frequency is not required: 150kg of lime (lime is added according to 6.5kg/t and contains converter top slag), 50-100 kg of fluorite and 100kg of silica are added before the electricity is supplied for the 1 st time, and the desulfurization heat is required: adding 200kg of lime (adding lime according to 7.0kg/t and containing converter top slag), 50-100 kg of fluorite and 100kg of silica before the 1 st time of power supply, controlling the power supply time of slag melting to be 5-8min, blowing for 1-2 minutes at each time of power supply, measuring the temperature and sampling, normally refining by a lower electrode after turning over, and finely adjusting the components according to the components of the sampling; the desulfurization heat is needed, 5-20kg of silicon carbide is added into the furnace, and slag formation is carried out in small batches in batches, wherein the slag formation is not too deep; controlling the refining period to be less than 35min, controlling the total power supply time to be 8-15min, and controlling the soft blowing time to be 3-8 min; the N content is controlled below 40ppm, the S content is controlled below 0.02, and the total oxygen content is controlled below 25 ppm;
continuous casting: the continuous casting is carried out by protecting and pouring the submerged nozzle of the crystallizer, and the pulling speed is controlled to be 2.6-3.3 m/min;
heating; the temperature of furnace gas in the soaking section is 1100-1200 ℃;
rolling and cooling: the rolling is carried out according to a non-controlled cooling mode, and water cooling is not carried out during the rolling process and after the rolling process.
3. The method of claim 2, wherein in the LF refining process, if the fluidity of the slag is poor after slagging, a small amount of additional fluorite can be added, and the additional amount does not exceed 40 kg.
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| CN202110958234.7A CN113637918A (en) | 2021-08-20 | 2021-08-20 | Titanium alloying HRB400E hot-rolled ribbed steel bar and manufacturing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114293095A (en) * | 2021-11-17 | 2022-04-08 | 攀钢集团攀枝花钢铁研究院有限公司 | 400 MPa-grade titanium micro-alloyed hot-rolled steel bar and production method thereof |
| CN114672610A (en) * | 2022-04-11 | 2022-06-28 | 广东韶钢松山股份有限公司 | HRB400E steel washing bag treatment method |
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2021
- 2021-08-20 CN CN202110958234.7A patent/CN113637918A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114293095A (en) * | 2021-11-17 | 2022-04-08 | 攀钢集团攀枝花钢铁研究院有限公司 | 400 MPa-grade titanium micro-alloyed hot-rolled steel bar and production method thereof |
| CN114672610A (en) * | 2022-04-11 | 2022-06-28 | 广东韶钢松山股份有限公司 | HRB400E steel washing bag treatment method |
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