CN103521730B - A kind of method of ferritic stainless steel rectangular bloom many stoves continuous casting - Google Patents
A kind of method of ferritic stainless steel rectangular bloom many stoves continuous casting Download PDFInfo
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- CN103521730B CN103521730B CN201310476199.0A CN201310476199A CN103521730B CN 103521730 B CN103521730 B CN 103521730B CN 201310476199 A CN201310476199 A CN 201310476199A CN 103521730 B CN103521730 B CN 103521730B
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Abstract
The present invention relates to a kind of method of ferritic stainless steel rectangular bloom many stoves continuous casting, it comprises the steps: I. by conticaster fluxion numeric order, be divided into first group and second group, often organize fluxion identical, after continuous casting the 5th stove unwraps bag greatly, casting 10-15min, steel tundish temperature is its liquidus curve+30 DEG C ~ liquidus curve+45 DEG C, first the often stream pulling rate of second group is down to 0.60 ~ 0.80m/min, the more often stream pulling rate of first group is down to 0.40 ~ 0.60m/min, change first group of submersed nozzle; II. the often stream pulling rate of first group is carried to 0.60 ~ 0.80m/min, interval 8 ~ 15min, the more often stream pulling rate of second group is down to 0.40 ~ 0.60m/min, change second group of submersed nozzle, after two groups of submersed nozzles are all changed, conticaster is often flowed pulling rate and carry to 0.85 ~ 1.30m/min.The method of this ferritic stainless steel rectangular bloom many stoves continuous casting, lapping defect base percent defective is less than 0.2%, and a middle continuous cast crystallizer number reaches 8 ~ 10 stoves.
Description
Technical field
The present invention relates to a kind of method of ferritic stainless steel rectangular bloom many stoves continuous casting.
Background technology
Production line, rod, silk and arrowband etc. are comparatively large by ferritic stainless steel market demand, and this steel series is when rectangular billet CC, and the submersed nozzle life-span is low, and direct casting is to the 5th stove, and each stream submersed nozzle slag line place is etched in succession wears.The method of existing ferritic stainless steel rectangular bloom many stoves continuous casting is, submersed nozzle slag line corrodes to be worn, if continue continuous casting, be forced to change hands dynamic replacing submersed nozzle, otherwise molten steel slag affects slab quality, and lapping defect base percent defective is greater than 2%.This problem, annoyings ferritic stainless steel slab quality for many years and produces normally, expects effectively to be solved always.
Summary of the invention
In order to overcome the above-mentioned deficiency of the method for existing ferritic stainless steel rectangular bloom many stoves continuous casting, the invention provides a kind of method of ferritic stainless steel rectangular bloom many stoves continuous casting, continuous cast method of the present invention produces casting blank section 376-484cm
2rectangular bloom, lapping defect base percent defective is less than 0.2%, and a middle continuous cast crystallizer number reaches 8 ~ 10 stoves.
Technical scheme of the present invention is:
According to submersed nozzle slag line place erosion condition, after continuous casting the 5th stove unwraps bag greatly, submersed nozzle is divided two groups, plannedly to change, in case submersed nozzle slag line place wears and is forced to change, not only can solve lapping defect and slag quality problems, and can also administration measure be guaranteed.
The method of this ferritic stainless steel rectangular bloom many stoves continuous casting comprises following step successively:
I conticaster often stream is equipped with 1 submersed nozzle, by conticaster fluxion numeric order, is divided into first group and second group, often organizes fluxion identical, and be 2 streams or 3 streams, namely often group has 2 or 3 submersed nozzles.After continuous casting the 5th stove unwraps bag greatly, casting 10-15min, institute's cast steel tundish temperature is its liquidus curve+30 DEG C ~ liquidus curve+45 DEG C, the often stream pulling rate first comprised second group is down to 0.60 ~ 0.80m/min, the often stream pulling rate comprised first group is again down to 0.40 ~ 0.60m/min, changes first group of submersed nozzle.
The II often stream pulling rate comprised first group is carried to 0.60 ~ 0.80m/min, interval 8 ~ 15min, the often stream pulling rate comprised second group is again down to 0.40 ~ 0.60m/min, change second group of submersed nozzle, after two groups of submersed nozzles are all changed, conticaster is often flowed pulling rate and all carry to 0.85 ~ 1.30m/min.
The method of above-mentioned ferritic stainless steel rectangular bloom many stoves continuous casting, is characterized in that: described first group is that the fluxion comprised by it is numbered the 1st stream and the 2nd stream; Described second group is that the fluxion comprised by it is numbered the 3rd stream and the 4th stream; Specifically the steps include:
After I continuous casting the 5th stove unwraps bag greatly, casting 10-15min, institute's cast steel tundish temperature is its liquidus curve+30 DEG C ~ liquidus curve+45 DEG C, 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.
Conticaster the 1st stream and the 2nd stream pulling rate are carried to 0.60 ~ 0.80m/min by II, 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, 1st flow to the 4th stream after submersed nozzle all changes, and flow to the 4th stream pulling rate all carry the 1st to 0.85 ~ 1.30m/min.
The method of above-mentioned ferritic stainless steel rectangular bloom many stoves continuous casting, is characterized in that: described first group is that the fluxion comprised by it is numbered the 1st stream, the 2nd stream and the 3rd stream; Described second group is that the fluxion comprised by it is numbered the 4th stream, the 5th stream and the 6th stream; Specifically the steps include:
After I continuous casting the 5th stove unwraps bag greatly, casting 10 ~ 15min, institute's cast steel tundish temperature is its liquidus curve+30 ~ liquidus curve+45 DEG C, 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 and flow and the 3rd stream submersed nozzle.
Conticaster the 1st stream, the 2nd stream and the 3rd stream pulling rate are carried to 0.60 ~ 0.80m/min by II, 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, 1st flow to the 6th stream after submersed nozzle all changes, and flow to the 6th stream pulling rate all carry the 1st to 0.85 ~ 1.30m/min.
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%, occurs, continuous casting furnace number 8 ~ 10 stove without slag, and continuous casting is produced normal.
Detailed description of the invention
Describe the detailed description of the invention of the method for this ferritic stainless steel rectangular bloom many stoves continuous casting in detail below in conjunction with embodiment, but the specific embodiment of the present invention is not limited to following embodiment.
embodiment one
The present embodiment is at 220 × 220mm
2four stream billet casters carry out, steel grade TCBS, liquidus curve 1513 DEG C, chemical composition mass percent:
C≤0.03; Si≤1.00; Mn≤1.00; P≤0.035; S≤0.010; Cr12.00-13.00; 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 Lu great Baogang water yield 85t, after unwrapping bag greatly, casting 12min, tundish temperature 1552 DEG C,
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 and flow and the 2nd stream submersed nozzle.
II the 1st streams and the 2nd stream submersed nozzle are changed normally, 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, flow to the 4th stream pulling rate by the 1st and all carry to 0.95m/min.
III the 5th stove chemical composition mass percents:
C0.01；Si0.26；Mn0.43；P0.020；S0.001；
Cr12.25; Ni0.10; N0.013; 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 stove, and continuous casting is produced normal.
embodiment two
The present embodiment is at 175 × 215mm
2six stream rectangle blank continuous casters carry out, steel grade TCBS2, liquidus curve 1505 DEG C, chemical composition mass percent:
C≤0.03; Si≤0.50; Mn≤0.50; P≤0.030; S≤0.010; Cr16.50-18.00; 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 Lu great Baogang water yield 83t, after unwrapping bag greatly, casting 10min, tundish temperature 1543 DEG C, 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 and flow and the 3rd stream submersed nozzle.
II the 1st streams, the 2nd stream and the 3rd stream submersed nozzle are changed normally, 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, flow to the 6th stream pulling rate by the 1st and all carry to 1.05m/min.
III the 5th stove chemical composition mass percents:
C0.02; Si0.30; Mn0.40; P0.022; S0.001; Cr16.70; Ni0.07; N0.015; 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 stove, and continuous casting is produced normal.
Conticaster fluxion: every platform 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 a machine first-class.If pour into a mould the strand of more than two simultaneously, be called a machine multithread.
Explain document
[1] He Daozhong chief editor. continuous casting steel machine (institution of higher education's programming textbook). 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 ferritic stainless steel rectangular bloom many stoves continuous casting, it comprises following step successively:
I conticaster often stream is equipped with 1 submersed nozzle, by conticaster fluxion numeric order, being divided into first group and second group, often organizing fluxion identical, is 2 streams or 3 streams, after continuous casting the 5th stove unwraps bag greatly, casting 10-15min, tundish temperature is its liquidus curve+30 DEG C ~ liquidus curve+45 DEG C, and the often stream pulling rate first comprised second group is down to 0.60 ~ 0.80m/min, the often stream pulling rate comprised first group is again down to 0.40 ~ 0.60m/min, changes first group of submersed nozzle;
The II often stream pulling rate comprised first group is carried to 0.60 ~ 0.80m/min, interval 8 ~ 15min, the often stream pulling rate comprised second group is again down to 0.40 ~ 0.60m/min, change second group of submersed nozzle, after two groups of submersed nozzles are all changed, conticaster is often flowed pulling rate and all carry to 0.85 ~ 1.30m/min.
2. the method for ferritic stainless steel rectangular bloom many stoves continuous casting according to claim 1, is characterized in that: described first group is that the fluxion comprised by it is numbered the 1st stream and the 2nd stream; Described second group is that the fluxion comprised by it is numbered the 3rd stream and the 4th stream.
3. the method for ferritic stainless steel rectangular bloom many stoves continuous casting according to claim 1, is characterized in that: described first group is that the fluxion comprised by it is numbered the 1st stream, the 2nd stream and the 3rd stream; Described second group is that the fluxion comprised 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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| CN103521730B true CN103521730B (en) | 2015-11-25 |
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| CN104328260B (en) * | 2014-10-31 | 2017-04-05 | 山西太钢不锈钢股份有限公司 | A kind of method for solving ferrite stainless billet transverse fissure |
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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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 |
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