CN103774040A - PSB830 finish rolling threaded steel and process for smelting steel by use of vanadium-titanium-containing molten iron - Google Patents
PSB830 finish rolling threaded steel and process for smelting steel by use of vanadium-titanium-containing molten iron Download PDFInfo
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- CN103774040A CN103774040A CN201410021831.7A CN201410021831A CN103774040A CN 103774040 A CN103774040 A CN 103774040A CN 201410021831 A CN201410021831 A CN 201410021831A CN 103774040 A CN103774040 A CN 103774040A
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Abstract
The invention discloses PSB830 finish rolling threaded steel and a process for smelting steel by use of vanadium-titanium-containing molten iron. The vanadium-titanium-containing molten iron serves as a raw material, and the processes such as converter vanadium extraction, semisteel steel-making, refining in an LF (Ladle Furnace) and continuous casting protection casting. The refined steel obtained by the refining process in the LF comprises the following components in percentage by weight: 0.28-0.38 percent of C, 0.80-0.105 percent of Si, 2.10-2.50 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, 0.040-0.080 percent of V, 0.015-0.080 percent of Ti and the balance of iron and inevitable impurities. According to the process, the effects of residual vanadium and titanium are fully exerted, the addition amount of vanadium and titanium alloys is reduced, and the cost is saved. The chemical components of the PSB830 finish rolling threaded steel are redesigned, the content of Si and Mn is adjusted, the Mn/Si value is improved and is about 2.0-3.2, and the castability of the molten steel is improved. By adopting a production mode of matching two LFs with a continuous casting machine, the tap-to-tap cycle is guaranteed to be within 56-60 minutes. Therefore, the process has the characteristics of low cost, high molten steel castability and short production cycle.
Description
Technical field
The invention belongs to metallurgical technology field, especially a kind of PSB830 finish rolling deformed bar and the technique of smelting this reinforcing bar containing vanadium-titanium-iron-water.
Background technology
In PSB830 finish rolling deformed bar, containing a certain amount of vanadium and can play the dual function of crystal grain thinning and precipitation strength, is mainly because vanadium can form stable carbide or nitride diffusion particle in steel.The solid solubility of vanadium in austenite is very high, but it is very low to deposit solid solubility in ferrite, is a kind of desirable ferrite precipitation strength element, special using vanadium as one of main strengthening element.In PSB830 finish rolling deformed bar, contain the effect that stops Austenite Grain Growth, control austenite recrystallization and precipitation strength when a certain amount of titanium can play heating, special using titanium as one of main strengthening element.
The smelting process of PSB830 finish rolling deformed bar is raw material mainly with common molten iron, and the chemical composition of PSB830 finish rolling deformed bar is on the basis of IV grade reinforcing steel trade mark chemical composition, suitably adjust or add alloying element, composition is as follows: C 0.36wt%～0.46wt%, Si 1.40wt%～1.80wt%, Mn 0.70wt%～1.00wt%, P≤0.045wt%, S≤0.045wt%, V 0.070wt%～0.150wt%, surplus is iron and inevitable impurity.Existing smelting process existing problems are: Mn/Si value is low, is about 0.4～0.7, are unfavorable for deoxidation alloying operation and continuous casting casting; Alloy addition is large, and alloy material cost is high; The production model that adopts a continuous caster of a LF refining furnace coupling, LF refining furnace treatment cycle is long.
Summary of the invention
The technical problem to be solved in the present invention is to overcome prior art shortcoming, and a kind of PSB830 finish rolling deformed bar of the Mn/Si of improvement value is provided; The present invention also provides a kind of and has rationally utilized vanadium titanium composition, improved the technique of smelting PSB830 finish rolling deformed bar containing vanadium-titanium-iron-water of Mn/Si value.
For solving the problems of the technologies described above; the present invention adopts the refining steel continuous casting protection pouring of following compositions to form: C 0.28wt%～0.38wt%; Si 0.80wt%～0.105wt%; Mn 2.10wt%～2.50wt%; P≤0.025wt%, S≤0.025wt%, V 0.040wt%～0.080wt%; Ti 0.015wt%～0.080wt%, surplus is iron and inevitable impurity.
Technique of the present invention is to contain vanadium-titanium-iron-water as raw material, to adopt converter extracting vanadium vanadium extraction, semi-steel making, the refining of LF refining furnace and continuous casting protection pouring operation;
The refining steel composition that described LF refining furnace refining procedure obtains is: C 0.28wt%～0.38wt%, Si 0.80wt%～0.105wt%, Mn 2.10wt%～2.50wt%, P≤0.025wt%, S≤0.025wt%, V 0.040wt%～0.080wt%, Ti 0.015wt%～0.080wt%, surplus is iron and inevitable impurity.
Described in technique of the present invention, vanadium extraction by converter blowing operation is: vanadium-bearing hot metal carries out vanadium extraction processing in converter, obtains containing vanadium half steel; The described content containing vanadium in vanadium half steel and titanium is: V 0.020wt%～0.040wt%, Ti 0.010wt%～0.015wt%.
Described in technique of the present invention, semi-steel making operation is: the described vanadium half steel that contains is blended into steel-making converter, in the time that meeting C 0.08wt%～0.10wt%, S≤0.025wt%, P≤0.015wt%, terminal taps, in steel, remaining vanadium is controlled at 0.010wt%～0.012wt%, and in steel, remaining titanium is controlled at 0.006wt%～0.008wt%.
Described in technique of the present invention LF refining furnace refining procedure for: molten steel that semi-steel making operation goes out adopts the production model of a continuous caster of two LF refining furnaces couplings to carry out refining, and the refining cycle phase is controlled at 56～60min.
The beneficial effect that adopts technique scheme to produce is: the present invention redesigns PSB830 finish rolling deformed bar chemical composition, adjust Si, Mn content, improve Mn/Si value, be about 2.0～3.2, thereby effectively raise the castability of molten steel, reinforcement yielding intensity >=830MPa, the tensile strength >=1030MPa, elongation after fracture >=6% that obtain, can meet the requirement of PSB830 level finish rolling deformed bar in GB/T 20065-2006.The present invention has easy cast, casting quality is high, the feature of good product performance.
Technique of the present invention, to contain vanadium-titanium-iron-water as raw material, can rationally be utilized its vanadium titanium composition, reduces the add-on of vanadium alloy and titanium alloy; And improve Mn/Si value, improved the castability of molten steel; Therefore, technique of the present invention has that alloy material cost is low, easily cast and the high feature of casting quality, can effectively improve the performance of product, reduces product cost.
A continuous caster of two LF refining furnace couplings of process using of the present invention, thus can guarantee that the smelting cycle phase is at 56～60min, thus can effectively shorten the production cycle, lifting process output, reduces production costs.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is process flow sheet of the present invention.
Embodiment
Be below the example that 100 tons of converter steelmaking workshops of Hebei steel mill smelt PSB830 finish rolling reinforcing bar, the major equipment wherein relating to has one of converter extracting vanadium, one of steel-making converter, and two LF refining furnaces, eight machines eight flow billet caster.
Embodiment 1(heat (batch) number: 0275, water order 5 stoves): as shown in Figure 1, this smelts the following concrete technology step of process using of PSB830 finish rolling deformed bar containing vanadium-titanium-iron-water:
Adopt ordinary method vanadium extraction containing vanadium-titanium-iron-water, until vanadium, titanium content are in half steel: V 0.037wt%, Ti 0.015wt%; Be blended into steel-making converter, adopt ordinary method blowing, blow end point C 0.10wt%, P 0.010wt%, S 0.023wt%, meets tapping requirement, and after tapping deoxidization alloying, remaining content of vanadium is 0.012wt%, and remaining titanium content is 0.008wt%; Enter 1
#lF refining furnace refining treatment, through 1
#after LF refining furnace refining 56min, winch to continuous caster protective casting, strand obtains PSB830 finish rolling deformed bar after rolling.
The composition of gained PSB830 finish rolling deformed bar is: C 0.31wt%, and Si 0.82wt%, Mn 2.29wt%, P 0.021wt%, S 0.002wt%, V 0.052wt%, Ti 0.019wt%, surplus is iron and inevitable impurity.The property indices of gained PSB830 finish rolling deformed bar is in table 1, and in table, property indices meets the requirement of PSB830 level finish rolling deformed bar in GB/T 20065-2006.
The performance index of table 1: embodiment 1 gained PSB830 finish rolling deformed bar
Embodiment 2(heat (batch) number: 0276, water order 6 stoves): this smelts the following concrete technology step of process using of PSB830 finish rolling deformed bar containing vanadium-titanium-iron-water:
Adopt ordinary method vanadium extraction containing vanadium-titanium-iron-water, until vanadium, titanium content are in half steel: V 0.030wt%, Ti 0.013%; Be blended into steel-making converter, adopt ordinary method blowing, blow end point C 0.08wt%, P 0.010wt%, S 0.021wt%, meets tapping requirement, and after tapping deoxidization alloying, remaining content of vanadium is 0.011wt%, and remaining titanium content is 0.008wt%; Enter 2
#lF refining furnace refining treatment, through 2
#after LF refining furnace refining 60min, winch to continuous caster protective casting, strand obtains PSB830 finish rolling deformed bar after rolling.
The composition of gained PSB830 finish rolling deformed bar is: C 0.28wt%, and Si 0.87wt%, Mn 2.27wt%, P 0.019wt%, S 0.001wt%, V 0.040wt%, Ti 0.022wt%, surplus is iron and inevitable impurity.The property indices of gained PSB830 finish rolling deformed bar is in table 2, and in table, property indices meets the requirement of PSB830 level finish rolling deformed bar in GB/T 20065-2006.
The performance index of table 2: embodiment 2 gained PSB830 finish rolling deformed bars
Embodiment 3(heat (batch) number: 0277, water order 7 stoves): this smelts the following concrete technology step of process using of PSB830 finish rolling deformed bar containing vanadium-titanium-iron-water:
Adopt ordinary method vanadium extraction containing vanadium-titanium-iron-water, until vanadium, titanium content are in half steel: V 0.033wt%, Ti 0.012%; Be blended into steel-making converter, adopt ordinary method blowing, blow end point C 0.08wt%, P 0.009wt%, S 0.022wt%, meets tapping requirement, and after tapping deoxidization alloying, remaining content of vanadium is 0.010wt%, and remaining titanium content is 0.006wt%; Enter 1
#lF refining furnace refining treatment, through 1
#after LF refining furnace refining 58min, winch to continuous caster protective casting, strand obtains PSB830 finish rolling deformed bar after rolling.
The composition of gained PSB830 finish rolling deformed bar is: C 0.34wt%, and Si 0.80wt%, Mn 2.26wt%, P 0.020wt%, S 0.003wt%, V 0.051wt%, Ti 0.015wt%, surplus is iron and inevitable impurity.The property indices of gained PSB830 finish rolling deformed bar is in table 3, and in table, property indices meets the requirement of PSB830 level finish rolling deformed bar in GB/T 20065-2006.
The performance index of table 3: embodiment 3 gained PSB830 finish rolling deformed bars
Embodiment 4(heat (batch) number: 0278, water order 8 stoves): this smelts the following concrete technology step of process using of PSB830 finish rolling deformed bar containing vanadium-titanium-iron-water:
Adopt ordinary method vanadium extraction containing vanadium-titanium-iron-water, until vanadium, titanium content are in half steel: V 0.020wt%, Ti 0.011%; Be blended into steel-making converter, adopt ordinary method blowing, blow end point C 0.10wt%, P 0.012wt%, S 0.025wt%, meets tapping requirement, and after tapping deoxidization alloying, remaining content of vanadium is 0.010wt%, and remaining titanium content is 0.007wt%; Enter 2#LF refining furnace refining treatment, after 2#LF refining furnace refining 57min, winch to continuous caster protective casting, strand obtains PSB830 finish rolling deformed bar after rolling.
The composition of gained PSB830 finish rolling deformed bar is: C 0.38wt%, and Si 0.80wt%, Mn 2.50wt%, P 0.022wt%, S 0.009wt%, V 0.080wt%, Ti 0.060wt%, surplus is iron and inevitable impurity.The property indices of gained PSB830 finish rolling deformed bar is in table 4, and in table, property indices meets the requirement of PSB830 level finish rolling deformed bar in GB/T 20065-2006.
The performance index of table 4: embodiment 4 gained PSB830 finish rolling deformed bars
Embodiment 5(heat (batch) number: 0279, water order 9 stoves): this smelts the following concrete technology step of process using of PSB830 finish rolling deformed bar containing vanadium-titanium-iron-water:
Adopt ordinary method vanadium extraction containing vanadium-titanium-iron-water, until vanadium, titanium content are in half steel: V 0.040wt%, Ti 0.010%; Be blended into steel-making converter, adopt ordinary method blowing, blow end point C 0.09wt%, P 0.015wt%, S 0.024wt%, meets tapping requirement, and after tapping deoxidization alloying, remaining content of vanadium is 0.012wt%, and remaining titanium content is 0.006wt%; Enter 1#LF refining furnace refining treatment, after 1#LF refining furnace refining 59min, winch to continuous caster protective casting, strand obtains PSB830 finish rolling deformed bar after rolling.
The composition of gained PSB830 finish rolling deformed bar is: C 0.36wt%, and Si 0.105wt%, Mn 2.10wt%, P 0.025wt%, S 0.012wt%, V 0.045wt%, Ti 0.080wt%, surplus is iron and inevitable impurity.The property indices of gained PSB830 finish rolling deformed bar is in table 5, and in table, property indices meets the requirement of PSB830 level finish rolling deformed bar in GB/T 20065-2006.
The performance index of table 5: embodiment 5 gained PSB830 finish rolling deformed bars
Claims (5)
1. a PSB830 finish rolling deformed bar; it is characterized in that; it adopts the refining steel continuous casting protection pouring of following compositions to form: C 0.28wt%～0.38wt%; Si 0.80wt%～0.105wt%, Mn 2.10wt%～2.50wt%, P≤0.025wt%; S≤0.025wt%; V 0.040wt%～0.080wt%, Ti 0.015wt%～0.080wt%, surplus is iron and inevitable impurity.
2. a technique of smelting PSB830 finish rolling deformed bar containing vanadium-titanium-iron-water, is characterized in that: it,, to contain vanadium-titanium-iron-water as raw material, adopts converter extracting vanadium vanadium extraction, semi-steel making, the refining of LF refining furnace and continuous casting protection pouring operation;
The refining steel composition that described LF refining furnace refining procedure obtains is: C 0.28wt%～0.38wt%, Si 0.80wt%～0.105wt%, Mn 2.10wt%～2.50wt%, P≤0.025wt%, S≤0.025wt%, V 0.040wt%～0.080wt%, Ti 0.015wt%～0.080wt%, surplus is iron and inevitable impurity.
3. technique of smelting PSB830 finish rolling deformed bar containing vanadium-titanium-iron-water according to claim 2, is characterized in that, described vanadium extraction by converter blowing operation is: vanadium-bearing hot metal carries out vanadium extraction processing in converter, obtains containing vanadium half steel; The described content containing vanadium in vanadium half steel and titanium is: V 0.020wt%～0.040wt%, Ti 0.010wt%～0.015wt%.
4. technique of smelting PSB830 finish rolling deformed bar containing vanadium-titanium-iron-water according to claim 2, it is characterized in that, described semi-steel making operation is: the described vanadium half steel that contains is blended into steel-making converter, in the time that meeting C 0.08wt%～0.10wt%, S≤0.025wt%, P≤0.015wt%, terminal taps, in steel, remaining vanadium is controlled at 0.010wt%～0.012wt%, and in steel, remaining titanium is controlled at 0.006wt%～0.008wt%.
5. according to the technique of smelting PSB830 finish rolling deformed bar containing vanadium-titanium-iron-water described in claim 2,3 or 4, it is characterized in that, described LF refining furnace refining procedure for: molten steel that semi-steel making operation goes out adopts the production model of a continuous caster of two LF refining furnaces couplings to carry out refining, and the refining cycle phase is controlled at 56～60min.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104328338A (en) * | 2014-10-30 | 2015-02-04 | 武汉钢铁(集团)公司 | Small-scale finish-rolled twisted steel and production method thereof |
| CN109355587A (en) * | 2018-10-18 | 2019-02-19 | 河钢股份有限公司承德分公司 | A kind of PSB1080 finish rolling deformed bar and its production method |
| CN112322985A (en) * | 2020-11-18 | 2021-02-05 | 江苏永钢集团有限公司 | Annealing-free PSB830 finish-rolled deformed steel bar and production process thereof |
| CN113186457A (en) * | 2021-04-02 | 2021-07-30 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Titanium microalloying hot-rolled ribbed steel bar HRB400E and smelting method thereof |
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| JP2009084648A (en) * | 2007-09-28 | 2009-04-23 | Kobe Steel Ltd | High strength hot rolled steel sheet having excellent fatigue strength and stretch-flange formability |
| CN102994871A (en) * | 2012-11-22 | 2013-03-27 | 河北钢铁股份有限公司承德分公司 | Method for smelting medium/high-carbon hard-wired steel by vanadium-titanium containing molten iron |
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- 2014-01-17 CN CN201410021831.7A patent/CN103774040B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009084648A (en) * | 2007-09-28 | 2009-04-23 | Kobe Steel Ltd | High strength hot rolled steel sheet having excellent fatigue strength and stretch-flange formability |
| CN102994871A (en) * | 2012-11-22 | 2013-03-27 | 河北钢铁股份有限公司承德分公司 | Method for smelting medium/high-carbon hard-wired steel by vanadium-titanium containing molten iron |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104328338A (en) * | 2014-10-30 | 2015-02-04 | 武汉钢铁(集团)公司 | Small-scale finish-rolled twisted steel and production method thereof |
| CN104328338B (en) * | 2014-10-30 | 2017-04-12 | 武汉钢铁(集团)公司 | Small-scale finish-rolled twisted steel and production method thereof |
| CN109355587A (en) * | 2018-10-18 | 2019-02-19 | 河钢股份有限公司承德分公司 | A kind of PSB1080 finish rolling deformed bar and its production method |
| CN112322985A (en) * | 2020-11-18 | 2021-02-05 | 江苏永钢集团有限公司 | Annealing-free PSB830 finish-rolled deformed steel bar and production process thereof |
| CN113186457A (en) * | 2021-04-02 | 2021-07-30 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Titanium microalloying hot-rolled ribbed steel bar HRB400E and smelting method thereof |
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