CN103521730A - Method of multi-furnace continuous casting of ferritic stainless steel rectangular blanks - Google Patents
Method of multi-furnace continuous casting of ferritic stainless steel rectangular blanks Download PDFInfo
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- CN103521730A CN103521730A CN201310476199.0A CN201310476199A CN103521730A CN 103521730 A CN103521730 A CN 103521730A CN 201310476199 A CN201310476199 A CN 201310476199A CN 103521730 A CN103521730 A CN 103521730A
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Abstract
The invention relates to a method of multi-furnace continuous casting of ferritic stainless steel rectangular blanks. The method comprises the following steps: step I, furnaces are divided into a first group and a second group according to a flow number sequence of a continuous casting machine, and the flow numbers of both groups are the same; after a big ladle is opened through continuous casting in the fifth furnace, pouring is conducted for 10-15 min, and the temperature of a steel tundish ranges from liquidus plus 30 DEG C to liquidus plus 45 DEG C; first, the pulling rate of each flow in the second group is reduced to be within the range of 0.60-0.80 m/min, then, the pulling rate of each flow in the first group is reduced to be within the range of 0.40-0.60 m/min, and a submerged nozzle of the first group is replaced; step II, the pulling rate of each flow in the first group is increased to be within the range of 0.60-0.80 m/min at the interval of 8-15 min, then, the pulling rate of each flow in the second group is reduced to be within the range of 0.40-0.60 m/min, and a submerged nozzle of the second group is replaced; after the submerged nozzles of the two groups are replaced completely, the pulling rate of each flow of the continuous casting machine is increased to be within the range of 0.85-1.30 m/min. By means of the method of multi-furnace continuous casting of the ferritic stainless steel rectangular blanks, the rejection rate of lapping defect blanks is lower than 0.2%, and one tundish continuous casting furnace can be used for casting 8-10 furnaces of the blanks.
Description
Technical field
The present invention relates to a kind of method of many stoves of ferritic stainless steel rectangular bloom continuous casting.
Background technology
Production line, rod, silk and arrowband etc. are larger by ferritic stainless steel market demand, and this steel series is when rectangular billet CC, and the submersed nozzle life-span is low, direct casting to the 5 stoves, and each flows submersed nozzle slag line place and is in succession etched and wears.The method of existing many stoves of ferritic stainless steel rectangular bloom continuous casting is that submersed nozzle slag line corrodes to be worn, if continue continuous casting, be forced to change hands moving replacing submersed nozzle, otherwise molten steel slag affects slab quality, and lapping defect base percent defective is greater than 2%.This problem, is perplexing for many years ferritic stainless steel slab quality and is producing with normal, and expectation always is effectively solved.
Summary of the invention
In order to overcome the above-mentioned deficiency of the method for existing many stoves of ferritic stainless steel rectangular bloom continuous casting, the invention provides a kind of method of many stoves of ferritic stainless steel rectangular bloom continuous casting, continuous cast method of the present invention is produced casting blank section 376-484cm
2rectangular bloom, lapping defect base percent defective is less than 0.2%, one middle continuous cast crystallizer number and reaches 8～10 stoves.
Technical scheme of the present invention is:
According to submersed nozzle slag line place erosion condition, continuous casting the 5th stove is unwrapped greatly after bag, by submersed nozzle, divides two groups, planned replacing, in case wear at submersed nozzle slag line place, be forced to change, not only can solve lapping defect and slag quality problems, and can also guarantee to produce stable.
The method of many stoves of this ferritic stainless steel rectangular bloom continuous casting comprises following step successively:
The every stream of I conticaster is equipped with 1 submersed nozzle, presses conticaster fluxion numeric order, is divided into first group and second group, and every group of fluxion is identical, is 2 streams or 3 streams, and every group has 2 or 3 submersed nozzles.Continuous casting the 5th stove is unwrapped greatly after bag, casting 10-15min, in institute's cast steel, wrap temperature for its liquidus curve+30 ℃～liquidus curve+45 ℃, first second group of every stream pulling rate comprising is down to 0.60～0.80m/min, again first group of every stream pulling rate comprising is down to 0.40～0.60m/min, changes first group of submersed nozzle.
II carries first group of every stream pulling rate comprising to 0.60～0.80m/min, interval 8～15min, again second group of every stream pulling rate comprising is down to 0.40～0.60m/min, change second group of submersed nozzle, two groups of submersed nozzles are all carried the every stream pulling rate of conticaster to 0.85～1.30m/min after all changing.
The method of above-mentioned many stoves of ferritic stainless steel rectangular bloom continuous casting, is characterized in that: described first group is that the fluxion comprising by it is numbered the 1st stream and the 2nd stream; Described second group is that the fluxion comprising by it is numbered the 3rd stream and the 4th stream; Specifically the steps include:
I continuous casting the 5th stove is unwrapped greatly after bag, casting 10-15min, in institute's cast steel, wrap temperature for its liquidus curve+30 ℃～liquidus curve+45 ℃, first conticaster the 3rd stream and the 4th stream pulling rate are down to 0.60～0.80m/min, again conticaster the 1st stream and the 2nd stream pulling rate are down to 0.40～0.60m/min, change the 1st stream and the 2nd stream submersed nozzle.
II carries conticaster the 1st stream and the 2nd stream pulling rate to 0.60～0.80m/min, interval 8～15min, again conticaster the 3rd stream and the 4th stream pulling rate are down to 0.40～0.60m/min, change the 3rd stream and the 4th stream submersed nozzle, the 1st flow to after the whole replacings of the 4th stream submersed nozzle, flow to the 4th stream pulling rate all carry to 0.85～1.30m/min the 1st.
The method of above-mentioned many stoves of ferritic stainless steel rectangular bloom continuous casting, is characterized in that: described first group is that the fluxion comprising by it is numbered the 1st stream, the 2nd stream and the 3rd stream; Described second group is that the fluxion comprising by it is numbered the 4th stream, the 5th stream and the 6th stream; Specifically the steps include:
I continuous casting the 5th stove is unwrapped greatly after bag, casting 10～15min, in institute's cast steel, wrap temperature for its liquidus curve+30～liquidus curve+45 ℃, first conticaster the 4th stream, the 5th stream and the 6th stream pulling rate are down to 0.60～0.80m/min, again conticaster the 1st stream, the 2nd stream and the 3rd stream pulling rate are down to 0.40～0.60m/min, change the 1st stream, the 2nd stream and the 3rd stream submersed nozzle.
II carries conticaster the 1st stream, the 2nd stream and the 3rd stream pulling rate to 0.60～0.80m/min, interval 8～15min, again conticaster the 4th stream, the 5th stream and the 6th stream pulling rate are down to 0.40～0.60m/min, change the 4th stream, the 5th stream and the 6th stream submersed nozzle, the 1st flow to after the whole replacings of the 6th stream submersed nozzle, flow to the 6th stream pulling rate all carry to 0.85～1.30m/min the 1st.
The present invention produces section 376～484cm
2, the rectangular bloom of four streams or six streams, lapping defect base percent defective is less than 0.2%, without slag, occurs, continuous casting furnace number 8～10 stoves, continuous casting is produced normal.
The specific embodiment
Below in conjunction with embodiment, describe the specific embodiment of the method for many stoves of this ferritic stainless steel rectangular bloom continuous casting in detail, but the specific embodiment of the present invention is not limited to following embodiment.
embodiment mono-
The present embodiment is at 220 * 220mm
2on four stream billet casters, carry out, steel grade TCBS, 1513 ℃ of liquidus curves, finished products is learned composition quality percentage:
C≤0.03; Si≤1.00; Mn≤1.00; P≤0.035; S≤0.010; Cr 12.00-13.00; Ni≤0.50; N≤0.030; All the other are Fe and inevitable impurity.
The present embodiment comprises the step of following imitation:
I continuous casting the 5th water yield 85t of Lu great Baogang, unwraps greatly after bag, casting 12min, and 1552 ℃ of middle bag temperature,
First conticaster the 3rd stream and the 4th stream pulling rate are down to 0.75m/min, then conticaster the 1st stream and the 2nd stream pulling rate are down to 0.50m/min, change the 1st stream and the 2nd stream submersed nozzle.
After II the 1st stream and the 2nd stream submersed nozzle are changed normally, the 1st stream and the 2nd stream pulling rate are carried to 0.75m/min, interval 9min, again the 3rd stream and the 4th stream pulling rate are down to 0.50m/min, change the 3rd stream and the 4th stream submersed nozzle, after casting is normal, by the 1st, flow to the 4th stream pulling rate and all carry to 0.95m/min.
III the 5th stove finished products is learned composition quality percentage:
C 0.01； Si 0.26； Mn 0.43； P 0.020； S 0.001；
Cr 12.25; Ni 0.10; N 0.013; All the other are Fe and inevitable impurity.
The present embodiment casting blank section 484cm
2, lapping defect base percent defective 0.12%, occurs without slag, continuous casting furnace number 9 stoves, and continuous casting is produced normal.
embodiment bis-
The present embodiment is at 175 * 215mm
2on six stream rectangle blank continuous casters, carry out, steel grade TCBS2,1505 ℃ of liquidus curves, finished products is learned composition quality percentage:
C≤0.03; Si≤0.50; Mn≤0.50; P≤0.030; S≤0.010; Cr 16.50-18.00; Ni≤0.20; N≤0.030; All the other are Fe and inevitable impurity.
The present embodiment comprises the step of following imitation:
I continuous casting the 5th water yield 83t of Lu great Baogang, unwrap greatly after bag, casting 10min, 1543 ℃ of middle bag temperature, conticaster the 4th stream, the 5th stream and the 6th stream pulling rate are down to 0.65m/min, when conticaster the 1st stream, the 2nd stream and the 3rd stream pulling rate are down to 0.55m/min, change the 1st stream, the 2nd stream and the 3rd stream submersed nozzle.
After II the 1st stream, the 2nd stream and the 3rd stream submersed nozzle are changed normally, the 1st stream, the 2nd stream and the 3rd stream pulling rate are carried to 0.65m/min, interval 8min, again the 4th stream, the 5th stream and the 6th stream pulling rate are down to 0.50m/min, change the 4th stream, the 5th stream and the 6th stream submersed nozzle, after casting is normal, by the 1st, flow to the 6th stream pulling rate and all carry to 1.05m/min.
III the 5th stove finished products is learned composition quality percentage:
C 0.02; Si 0.30; Mn 0.40; P 0.022; S 0.001; Cr 16.70; Ni 0.07; N 0.015; All the other are Fe and inevitable impurity.
The present embodiment casting blank section 376.25cm
2, lapping defect base percent defective 0.06%, occurs without slag, continuous casting furnace number 8 stoves, and continuous casting is produced normal.
Conticaster fluxion: every conticaster can pour into a mould total radical of strand simultaneously.All conticasters only have a unit, can only pour into a mould again a strand, claim that a machine is first-class.If pour into a mould two above strands simultaneously, be called a machine multithread.
Explain document
[1] He Daozhong chief editor. continuous casting steel machine (institution of higher education's planning teaching material). Beijing: metallurgical industry publishing house, 2007:13.
[2] metallurgical newspaper office compiles. and continuous casting steel machine 500 is asked. Beijing: metallurgical industry publishing house, 1994:6-7.
Claims (3)
1. a method for many stoves of ferritic stainless steel rectangular bloom continuous casting, it comprises following step successively:
The every stream of I conticaster is equipped with 1 submersed nozzle, press conticaster fluxion numeric order, be divided into first group and second group, every group of fluxion is identical, is 2 streams or 3 streams, continuous casting the 5th stove is unwrapped greatly after bag, casting 10-15min, wraps temperature for its liquidus curve+30 ℃～liquidus curve+45 ℃ in institute's cast steel, first second group of every stream pulling rate comprising is down to 0.60～0.80m/min, again first group of every stream pulling rate comprising is down to 0.40～0.60m/min, changes first group of submersed nozzle;
II carries first group of every stream pulling rate comprising to 0.60～0.80m/min, interval 8～15min, again second group of every stream pulling rate comprising is down to 0.40～0.60m/min, change second group of submersed nozzle, two groups of submersed nozzles are all carried the every stream pulling rate of conticaster to 0.85～1.30m/min after all changing.
2. the method for many stoves of ferritic stainless steel rectangular bloom continuous casting according to claim 1, is characterized in that: described first group is that the fluxion comprising by it is numbered the 1st stream and the 2nd stream; Described second group is that the fluxion comprising by it is numbered the 3rd stream and the 4th stream.
3. the method for many stoves of ferritic stainless steel rectangular bloom continuous casting according to claim 1, is characterized in that: described first group is that the fluxion comprising by it is numbered the 1st stream, the 2nd stream and the 3rd stream; Described second group is that the fluxion comprising by it is numbered the 4th stream, the 5th stream and the 6th stream.
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| CN201310476199.0A CN103521730B (en) | 2013-10-14 | 2013-10-14 | A kind of method of ferritic stainless steel rectangular bloom many stoves continuous casting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104328260A (en) * | 2014-10-31 | 2015-02-04 | 山西太钢不锈钢股份有限公司 | Method for solving transverse cracks of ferrite stainless steel square billet |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60203351A (en) * | 1984-03-29 | 1985-10-14 | Sumitomo Metal Ind Ltd | Method for controlling molten metal level in continuous casting of thin billet |
| JP2002248551A (en) * | 2001-02-23 | 2002-09-03 | Sumitomo Metal Ind Ltd | Continuous casting method for steel |
| CN103203663A (en) * | 2013-04-12 | 2013-07-17 | 山西太钢不锈钢股份有限公司 | Grinding method for double-phase heat-resistant stainless steel continuous casting sheet billet |
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2013
- 2013-10-14 CN CN201310476199.0A patent/CN103521730B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60203351A (en) * | 1984-03-29 | 1985-10-14 | Sumitomo Metal Ind Ltd | Method for controlling molten metal level in continuous casting of thin billet |
| JP2002248551A (en) * | 2001-02-23 | 2002-09-03 | Sumitomo Metal Ind Ltd | Continuous casting method for steel |
| CN103203663A (en) * | 2013-04-12 | 2013-07-17 | 山西太钢不锈钢股份有限公司 | Grinding method for double-phase heat-resistant stainless steel continuous casting sheet billet |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104328260A (en) * | 2014-10-31 | 2015-02-04 | 山西太钢不锈钢股份有限公司 | Method for solving transverse cracks of ferrite stainless steel square billet |
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