CN112226682A - Titanium microalloying production process for deformed steel bar - Google Patents
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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- C—CHEMISTRY; METALLURGY
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Abstract
The invention relates to a production process of steel for HRB 400E-grade threaded steel bars, which comprises the following components in percentage by weight: c: 0.21% -0.25%, Si: 0.65% -0.80%, Mn: 1.40-1.60%, Ti: 0.004-0.030%, P: 0.045% or less, S: less than 0.045%, and the balance of Fe and inevitable impurities. The screw-thread steel titanium micro-alloying production process comprises the following steps: the method comprises the steps of converter smelting, external treatment, continuous casting, casting blank heating and rolling, wherein the converter smelting step comprises the addition of silicon-manganese alloy and the like for deoxidation alloying treatment, and the external treatment step comprises the blowing of argon in an argon blowing station, unnecessary LF furnace refining and the addition of ferrotitanium for titanium microalloying treatment. The invention has low comprehensive production cost, obviously reduces the incidence rate of water gap blockage and continuous casting billet crack defects in the continuous casting process, and realizes the low-cost stable and sustainable production of HRB 400-grade deformed steel.
Description
Technical Field
The invention relates to the technical field of steel materials, in particular to a titanium microalloying production process for deformed steel bars.
Background
With the implementation of the new national standard of deformed steel, strong water penetration and controlled rolling and controlled cooling processes are eliminated by each steel enterprise, and after the steel enterprises return to a path of improving the strength through alloy, the alloying cost is obviously increased, and great challenges are brought to the control of the cost and the process stability of enterprises. At present, the deformed steel bar in China is generally alloyed by vanadium series or niobium series, so that the strength of a finished product is improved, and the target mechanical property is ensured to be achieved. And some enterprises also realize the strengthening of the composite alloy by adding vanadium, niobium and titanium elements. In China, vanadium resources are in short supply, the price is high and rises continuously, a rolling and cooling control system with strict technical requirements on niobium microalloying is adopted, and titanium resources are rich and the price is stable. However, titanium is active in chemical property and is easily combined with impurity elements such as O, N, S in steel, and precipitated TiC is sensitive to the temperature and cooling speed of a casting blank in each direction, so that the mechanical properties of steel materials in different furnaces or different parts of the same furnace are easily fluctuated. Therefore, the stable and sustainable titanium microalloying production process is the key for realizing the production of the deformed steel with low microalloying cost.
Disclosure of Invention
In order to solve the above problems, the present invention provides the following technical solutions:
a screw-thread steel titanium micro-alloying production process comprises the following components in percentage by weight: c: 0.21% -0.25%, Si: 0.65% -0.80%, Mn: 1.40-1.60%, Ti: 0.004-0.030 percent of the total weight of the alloy, less than or equal to 0.045 percent of P, less than or equal to 0.045 percent of S, and the balance of Fe and inevitable impurities.
A process for producing deformed steel bar by titanium microalloying comprises the following steps: converter smelting, external treatment, continuous casting, casting blank heating and rolling; the converter smelting step comprises the steps of adding silicon-manganese alloy and the like for deoxidation alloying treatment; the external treatment steps comprise argon blowing at an argon blowing station, unnecessary LF furnace refining and titanium and iron addition for titanium microalloying treatment.
The converter smelting step comprises the following steps: smelting the raw materials in a 60-ton converter by using molten iron, wherein the end point temperature ranges from 1630 to 1660 ℃, the end point C content is 0.06 to 0.08 percent, and the P content is less than or equal to 0.03 percent; and after 1/3 steel tapping, adding a silicomanganese alloy, an aluminum-calcium-carbon composite deoxidizer and the like into the steel ladle for deoxidation alloying, wherein the addition amount of the deoxidizer is 4kg/t of steel, argon is blown to the bottom of the steel ladle in the whole steel tapping process, and the nitrogen blowing flow is 500-700L/min.
The step of processing outside the furnace comprises the following steps: after the ladle reaches a refining position, selecting whether the ladle is refined in an LF furnace according to the primary refining temperature and the primary refining components, and continuously blowing argon at the bottom of 500-700L/min without refining for 10-12 min; adding 5-7 kg/t of steel into a ladle needing LF furnace refining, transmitting power, heating and adjusting temperature, adding silicon carbide and ferrosilicon powder into a slag surface for rapid slagging, blowing argon gas at the bottom for stirring in the whole process, wherein the argon gas flow in the stirring treatment process is 200-300L/min, treating for 5-7 min, the temperature range is 1560-1585 ℃, adding 4-8kg/t of ferrotitanium steel into the ladle, soft blowing for more than 3min by adopting the argon gas flow at the bottom for blowing after titanium microalloying, and then hoisting the ladle to a continuous casting platform for casting.
The continuous casting step comprises: the continuous casting is carried out by protecting and pouring the submerged nozzle of the crystallizer, the pulling speed is controlled to be 2.5-2.9 m/min, the secondary cooling adopts a weak cooling mode, and the specific water amount is 0.8-1.0L/kg.
The casting blank heating and rolling steps comprise: the temperature of furnace gas in a casting blank soaking section is 1100 ℃, rolling is carried out according to a non-controlled cooling mode, and forced water cooling is not carried out in the rolling process and at the end.
Compared with the prior art, the invention can stably manufacture HRB 400-grade deformed steel bar, deoxidize and alloy by adding silicomanganese alloy, aluminum calcium carbon composite deoxidizer and the like into a ladle in the tapping process, and add ferrotitanium into the ladle in the external treatment step for titanium microalloying treatment. The single microalloying of the titanium element is adopted to replace a composite microalloying production process, so that the comprehensive cost of the microalloying is reduced, and the low-cost stable and sustainable production of the deformed steel bar is realized. The incidence of water gap blockage and continuous casting billet crack defects in the continuous casting process are obviously reduced. The diameter of the deformed steel bar is 12-18 mm, the yield strength 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, no martensite or bainite appears in a metallographic structure, and all performance indexes can meet the requirements of new national standards.
Drawings
FIG. 1 is a schematic view of a process flow of titanium microalloying production of deformed steel bars according to the present invention.
Detailed Description
In order to better explain the technical solution of the present invention, the technical solution of the present invention is further described below with reference to specific examples, which are only exemplary to illustrate the technical solution of the present invention and do not limit the present invention in any way.
Example 1
A production process of steel for HRB 400E-grade threaded steel bars comprises the following steps of: c: 0.21%, Si: 0.65%%, Mn: 1.40%, Ti: 0.004%, P: 0.045%, S: 0.045%, and the balance of Fe and inevitable impurities.
The production process comprises the following steps: the method comprises the steps of converter smelting, external treatment, continuous casting, casting blank heating and rolling, wherein the converter smelting step comprises the addition of silicon-manganese alloy and the like for deoxidation alloying treatment, and the external treatment step comprises the blowing of argon in an argon blowing station, unnecessary refining in an LF furnace and the addition of ferrotitanium for titanium microalloying treatment.
The converter smelting step comprises: smelting the raw materials in a 60-ton converter with the end point temperature range of 1630 ℃, the end point C content of 0.06 percent and the P content of less than or equal to 0.03 percent; after 1/3 steel is tapped, a silicon-manganese alloy, an aluminum-calcium-carbon composite deoxidizer and the like are added into a steel ladle for deoxidation alloying, the adding amount of the deoxidizer is 4kg/t of steel, argon is blown at the bottom of the steel ladle in the whole tapping process, and the flow rate is 500L/min.
The external treatment step comprises: and after the ladle reaches the refining position, selecting whether the ladle is refined in the LF furnace according to the primary refining temperature and the primary refining components, and continuously blowing argon at the bottom of 500L/min without refining for 10 min. Adding 5kg/t of steel into a ladle needing LF furnace refining, transmitting power, heating and adjusting temperature, adding silicon carbide and ferrosilicon powder into a slag surface to quickly adjust slag, blowing argon gas at the bottom for stirring in the whole process, wherein the argon gas flow in the stirring treatment process is 200L/min, treating for 5min, the temperature range is 1560 ℃, adding 4kg/t of ferrotitanium steel into the ladle, after titanium microalloying, soft blowing for more than 3min by adopting the argon gas flow of the bottom blowing for 50L/min, and then lifting the ladle to a continuous casting platform for casting.
The continuous casting step comprises the following steps: the continuous casting is carried out by protecting and pouring the submerged nozzle of the crystallizer, the pulling speed is controlled at 2.5m/min, the secondary cooling adopts a weak cooling mode, and the specific water amount is 0.8L/kg.
The casting blank heating and rolling steps comprise: the temperature of furnace gas in a casting blank soaking section is 1100 ℃, rolling is carried out according to a non-controlled cooling mode, and forced water cooling is not carried out in the rolling process and at the end.
Example 2
A screw-thread steel titanium micro-alloying production process comprises the following components in percentage by weight: c: 0.25%, Si: 0.80%, Mn: 1.60%, Ti: 0.030%, P: 0.04%, S: 0.04% and the balance of Fe and inevitable impurities.
A process for producing deformed steel bar by titanium microalloying comprises the following steps: converter smelting, external treatment, continuous casting, casting blank heating and rolling; the converter smelting step comprises the steps of adding silicon-manganese alloy and the like for deoxidation alloying treatment; the external treatment steps comprise argon blowing at an argon blowing station, unnecessary LF furnace refining and titanium and iron addition for titanium microalloying treatment.
The converter smelting step comprises: smelting the raw materials in a 60-ton converter with the end point temperature range of 1660 ℃, the end point C content of 0.08 percent and the P content of less than or equal to 0.03 percent; after 1/3 steel is tapped, a silicon-manganese alloy, an aluminum-calcium-carbon composite deoxidizer and the like are added into a steel ladle for deoxidation alloying, the adding amount of the deoxidizer is 4kg/t of steel, argon is blown at the bottom of the steel ladle in the whole tapping process, and the flow is 700L/min.
The external treatment step comprises: after the ladle reaches the refining position, selecting whether to refine in an LF furnace according to the primary refining temperature and the primary refining components, and continuously blowing argon at the bottom of 700L/min without refining, wherein the argon blowing time is 12 min; adding 7kg/t of active lime steel into a ladle needing LF furnace refining, transmitting power, heating and adjusting temperature, adding silicon carbide and ferrosilicon powder into a slag surface for rapid slagging, blowing argon gas at the bottom for stirring in the whole process, wherein the argon gas flow in the stirring treatment process is 300L/min, treating for 7min, the temperature range is 1585 ℃, adding 8kg/t of ferrotitanium steel into the ladle, after titanium microalloying, soft blowing for more than 3min by adopting the argon gas flow at the bottom for blowing at 100L/min, and then lifting the ladle to a continuous casting platform for casting.
The continuous casting step comprises the following steps: the continuous casting is carried out by protecting and pouring the submerged nozzle of the crystallizer, the pulling speed is controlled at 2.9m/min, the secondary cooling adopts a weak cooling mode, and the specific water amount is 1.0L/kg.
The casting blank heating and rolling steps comprise: the temperature of furnace gas in a casting blank soaking section is 1100 ℃, rolling is carried out according to a non-controlled cooling mode, and forced water cooling is not carried out in the rolling process and at the end.
Example 3
A screw-thread steel titanium micro-alloying production process comprises the following components in percentage by weight: c: 0.23%, Si: 0.7%, Mn: 1.50%, Ti: 0.010%, P: 0.03%, S: 0.035%, and the balance of Fe and inevitable impurities.
A process for producing deformed steel bar by titanium microalloying comprises the following steps: converter smelting, external treatment, continuous casting, casting blank heating and rolling; the converter smelting step comprises the steps of adding silicon-manganese alloy and the like for deoxidation alloying treatment; the external treatment steps comprise argon blowing at an argon blowing station, unnecessary LF furnace refining and titanium and iron addition for titanium microalloying treatment.
The converter smelting step comprises: smelting the raw materials in a 60-ton converter by molten iron, wherein the end point temperature is 1640 ℃, the end point C content is 0.07 percent, and the P content is less than or equal to 0.03 percent; after 1/3 steel is tapped, a silicon-manganese alloy, an aluminum-calcium-carbon composite deoxidizer and the like are added into a steel ladle for deoxidation alloying, the adding amount of the deoxidizer is 4kg/t of steel, argon is blown at the bottom of the steel ladle in the whole tapping process, and the flow rate is 600L/min.
The external treatment step comprises: after the ladle reaches the refining position, selecting whether to refine in an LF furnace according to the primary refining temperature and the primary refining components, and continuously blowing argon at the bottom of 600L/min without refining, wherein the argon blowing time is 11 min; adding 6kg/t of steel into a ladle needing LF furnace refining, transmitting power, heating and adjusting temperature, adding silicon carbide and ferrosilicon powder into a slag surface for rapid slagging, blowing argon gas at the bottom for stirring in the whole process, wherein the argon gas flow in the stirring treatment process is 240L/min, treating for 6min, the temperature range is 1570 ℃, adding 5kg/t of ferrotitanium steel into the ladle, after titanium microalloying, soft blowing for more than 3min by adopting the argon gas flow at the bottom for blowing 70L/min, and then lifting the ladle to a continuous casting platform for casting.
The continuous casting step comprises the following steps: the continuous casting is carried out by protecting and pouring the submerged nozzle of the crystallizer, the pulling speed is controlled at 2.6m/min, the secondary cooling adopts a weak cooling mode, and the specific water amount is 0.9L/kg.
The casting blank heating and rolling steps comprise: the temperature of furnace gas in a casting blank soaking section is 1100 ℃, rolling is carried out according to a non-controlled cooling mode, and forced water cooling is not carried out in the rolling process and at the end.
The steel ladle is added with silicomanganese alloy, aluminum calcium carbon composite deoxidizer and the like for deoxidation alloying in the tapping process, and ferrotitanium is added in the external treatment step for titanium microalloying treatment. The single microalloying of the titanium element is adopted to replace a composite microalloying production process, so that the comprehensive cost of the microalloying is reduced, and the low-cost stable and sustainable production of the deformed steel bar is realized.
TABLE 1 ferrotitanium composition
The titanium microalloyed HRB 400-grade deformed steel manufactured by the production process adopts titanium single-element microalloying to replace a composite microalloying production process, and has low deoxidation cost and refining cost, and the Ti yield is 30-40%. At present, the price of 50 percent ferrovanadium in the market is about 9.20 ten thousand yuan/ton, 60 percent ferroniobium is about 18.58 ten thousand yuan/ton, and 30 percent ferrotitanium is about 0.79 ten thousand yuan/ton. Conventionally, the HRB400 is made of a vanadium alloy or a niobium alloy, and the finished product requires a V content of 0.025% or a Nb content of 0.014%, and the titanium alloy requires a titanium content of 0.012%. The yield of Ti is 30 percent, the yield of V, Nb is 100 percent, the saved deoxidation cost and the refining cost are not considered, and the alloy cost can be saved by 30-40 yuan/t.
The basis of calculation is as follows: titanium: 0.012%/30%/7900 =10.53
Niobium: 0.014%/60%/100%. 185800 =43.35
Vanadium: 0.025%/50%/100%/92000 =46.00
The above-described embodiments are merely exemplary and are not intended to limit the invention in any way, and any insubstantial changes in form or detail made by anyone following the principles of the claimed invention are intended to fall within the spirit and scope of the claimed invention.
Claims (6)
1. A screw-thread steel titanium micro-alloying production process is characterized in that: the deformed steel bar comprises the following components in percentage by weight: c: 0.21% -0.25%, Si: 0.65% -0.80%, Mn: 1.40-1.60%, Ti: 0.004-0.030 percent of the total weight of the alloy, less than or equal to 0.045 percent of P, less than or equal to 0.045 percent of S, and the balance of Fe and inevitable impurities.
2. The process for producing the deformed steel bar by titanium microalloying according to claim 1, wherein the process comprises the following steps: converter smelting, external treatment, continuous casting, casting blank heating and rolling; the converter smelting step comprises the steps of adding silicon-manganese alloy and the like for deoxidation alloying treatment; the external treatment steps comprise argon blowing at an argon blowing station, unnecessary LF furnace refining and titanium and iron addition for titanium microalloying treatment.
3. The process for producing the deformed steel bar by titanium microalloying according to claim 2, wherein the converter smelting step comprises the following steps: smelting the raw materials in a 60-ton converter by using molten iron, wherein the end point temperature ranges from 1630 to 1660 ℃, the end point C content is 0.06 to 0.08 percent, and the P content is less than or equal to 0.03 percent; and after 1/3 steel tapping, adding a silicomanganese alloy, an aluminum-calcium-carbon composite deoxidizer and the like into the steel ladle for deoxidation alloying, wherein the addition amount of the deoxidizer is 4kg/t of steel, and argon is blown from the bottom of the steel ladle in the whole steel tapping process, and the flow rate is 500-700L/min.
4. The process for producing a titanium microalloyed thread steel as claimed in claim 2, wherein the step of external treatment includes: after the ladle reaches a refining position, selecting whether the ladle is refined in an LF furnace according to the primary refining temperature and the primary refining components, and continuously blowing argon at the bottom of 500-700L/min without refining for 10-12 min; adding 5-7 kg/t of steel into a ladle needing LF furnace refining, transmitting power, heating and adjusting temperature, adding silicon carbide and ferrosilicon powder into a slag surface for rapid slagging, blowing argon gas at the bottom for stirring in the whole process, wherein the argon gas flow in the stirring treatment process is 200-300L/min, treating for 5-7 min, the temperature range is 1560-1585 ℃, adding 4-8kg/t of ferrotitanium steel into the ladle, soft blowing for more than 3min by adopting the argon gas flow at the bottom for blowing after titanium microalloying, and then hoisting the ladle to a continuous casting platform for casting.
5. The process for producing a threaded steel titanium microalloying according to claim 2, wherein the continuous casting step includes: the continuous casting is carried out by protecting and pouring the submerged nozzle of the crystallizer, the pulling speed is controlled to be 2.5-2.9 m/min, the secondary cooling adopts a weak cooling mode, and the specific water amount is 0.8-1.0L/kg.
6. The process for producing a threaded steel titanium microalloying as defined in claim 2, wherein the step of heating and rolling the cast slab comprises: the temperature of furnace gas in a casting blank soaking section is 1100 ℃, rolling is carried out according to a non-controlled cooling mode, and forced water cooling is not carried out in the rolling process and at the end.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112267071A (en) * | 2020-09-30 | 2021-01-26 | 江苏永钢集团有限公司 | High-strength deformed steel bar for building and production method thereof |
| CN114854940A (en) * | 2022-04-26 | 2022-08-05 | 江苏省镔鑫钢铁集团有限公司 | Refining slag washing and refining process and device for refining slag |
| CN116694991A (en) * | 2023-05-26 | 2023-09-05 | 包头钢铁（集团）有限责任公司 | Niobium-titanium microalloyed HRB500E deformed steel bar and preparation method thereof |
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