CN109763075A - A kind of S50C medium carbon steel and its smelting process - Google Patents
A kind of S50C medium carbon steel and its smelting process Download PDFInfo
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- CN109763075A CN109763075A CN201910132578.5A CN201910132578A CN109763075A CN 109763075 A CN109763075 A CN 109763075A CN 201910132578 A CN201910132578 A CN 201910132578A CN 109763075 A CN109763075 A CN 109763075A
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Abstract
The invention discloses a kind of S50C medium carbon steel and its smelting processes, it is at being grouped as and its weight percentage are as follows: C 0.49%~0.51%, Si 0.20%~0.32%, Mn 0.70%~0.80%, P≤0.015%, S≤0.005%, Al 0.020%~0.050%, Cr 0.28%~0.35%, surplus are Fe and inevitable impurity.This medium carbon steel is by being precisely controlled steel-making ingredient, and addition Cr element reaches the service life for extending steel, and the flaw detection qualification rate of steel ingot significantly improves, and internal soundness is good.The steel ingot inside solid degree of the method for the present invention production is high, and quality is stablized, flaw detection qualification rate >=98% after molding, and internal soundness is good；Steel ingot specification is 20~40 tons.
Description
Technical field
The invention belongs to steelmaking technical field, especially a kind of S50C medium carbon steel and its smelting process.
Background technique
S50C steel is high-duty cast medium carbon steel, due to being widely used in modeling with good machining property and cutting ability
Rubber moulding frame matching board and mechanical fitting use.With the increase of the market demand, the especially increase of mould steel dosage, the need of S50C steel
It asks in increase trend.But with the increase of substance, the expansion of steel ingot specification, the traditional smelting of S50C steel and pouring technology without
Method meets the above demand, be easy to cause the steel plate inspection qualification rate segregation problems of production, influences the production of steel plate.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of S50C medium carbon steel of high-quality；The present invention also provides one kind
The smelting process of S50C medium carbon steel.
In order to solve the above technical problems, of the invention at being grouped as and its weight percentage are as follows: C 0.49%~0.51%,
Si 0.20%~0.32%, Mn 0.70%~0.80%, P≤0.015%, S≤0.005%, Al 0.020%~0.050%, Cr
0.28%~0.35%, surplus is Fe and inevitable impurity.
The method of the present invention includes refining, pouring and demolding slow cooling operation；Gained steel ingot at being grouped as and its weight percent
Content is as described above；
The refining procedure: 25~30min is kept under the conditions of 30~40min of white slag retention time, 50~60Pa of vacuum degree；Vacuum
Preceding 5~7min is destroyed to bull ladle using soft blow mode, 15~25min of soft blow time；
The casting process: for the control of the casting degree of superheat at 33~37 DEG C, steel ingot infuses 2~2.5t/min of speed.
In refining procedure of the present invention, whole Argon is refined.
The duration of pouring in casting process of the present invention are as follows: 4~6min of Steel ingot feeder head, 6~10min of ontology.
Demoulding slow cooling operation of the present invention: demoulding after the cooling 15~17h of ingot mould, and demoulding rear cover ladle slow cooling 35~
40h。
The beneficial effects of adopting the technical scheme are that the present invention is by precisely controlling steel-making ingredient
System, addition Cr element reach the service life for extending steel, and the flaw detection qualification rate of steel ingot significantly improves, and internal soundness is good.
For the method for the present invention by being precisely controlled to steel-making ingredient, addition Cr element reaches the service life for extending steel,
The steel ingot inside solid degree of production is high, and quality is stablized, flaw detection qualification rate >=98% after molding, and internal soundness is good；Steel ingot specification is
20~40 tons.
Specific embodiment
The present invention will be further described in detail below with reference to specific embodiments.
1: this S50C medium carbon steel of embodiment and its smelting process are described in detail below.
(1) the S50C medium carbon steel steel ingot that specification is 20 tons, composition by weight percent composition are as follows: C 0.49%, Si are smelted
0.20%, Mn 0.70%, P 0.015%, S 0.005%, Al 0.020%, Cr 0.28%, surplus are Fe and inevitable impurity.
(2) refining procedure: being refined using LF furnace, refines whole Argon, white slag retention time 30min, vacuum degree
25min is kept under 50Pa；5min is to bull ladle using soft blow mode, soft blow time 15min before vacuum breaking.
(3) be poured process: the ingot mould for selecting inner wall intact, for the control of the casting degree of superheat at 33 DEG C, steel ingot infuses speed 2t/min,
The duration of pouring: Steel ingot feeder head 4min, ontology 6min.
(4) it demoulds slow cooling operation: being demoulded after the cooling 15h of ingot mould, demould rear cover ladle slow cooling 35h, can be obtained described
S50C medium carbon steel steel ingot.
The flaw detection qualification rate of S50C medium carbon steel steel ingot obtained by the present embodiment is 98%, hence it is evident that improves steel ingot internal soundness.
2: this S50C medium carbon steel of embodiment and its smelting process are described in detail below.
(1) the S50C medium carbon steel steel ingot that specification is 25 tons, composition by weight percent composition are as follows: C 0.51%, Si are smelted
0.32%, Mn 0.80%, P 0.010%, S 0.004%, Al 0.050%, Cr 0.35%, surplus are Fe and inevitable impurity.
(2) refining procedure: being refined using LF furnace, refines whole Argon, white slag retention time 40min, vacuum degree
30min is kept under 60Pa；7min is to bull ladle using soft blow mode, soft blow time 25min before vacuum breaking.
(3) be poured process: the ingot mould for selecting inner wall intact, for the control of the casting degree of superheat at 37 DEG C, steel ingot infuses speed 2.5t/
Min, the duration of pouring: Steel ingot feeder head 4min, ontology 6min.
(4) it demoulds slow cooling operation: being demoulded after the cooling 17h of ingot mould, demould rear cover ladle slow cooling 40h, can be obtained described
S50C medium carbon steel steel ingot.
The flaw detection qualification rate of S50C medium carbon steel steel ingot obtained by the present embodiment is 99%, hence it is evident that improves steel ingot internal soundness.
3: this S50C medium carbon steel of embodiment and its smelting process are described in detail below.
(1) the S50C medium carbon steel steel ingot that specification is 30 tons is smelted, composition by weight percent composition are as follows: C 0.50%, Si
0.28%, Mn 0.75%, P 0.011%, S 0.004%, Al 0.040%, Cr 0.30%, surplus are Fe and inevitable impurity.
(2) refining procedure: being refined using LF furnace, refines whole Argon, white slag retention time 35min, vacuum degree
27min is kept under 55Pa；6min is to bull ladle using soft blow mode, soft blow time 20min before vacuum breaking.
(3) be poured process: the ingot mould for selecting inner wall intact, for the control of the casting degree of superheat at 35 DEG C, steel ingot infuses speed 2.2t/
Min, the duration of pouring: Steel ingot feeder head 5min, ontology 8.6min.
(4) it demoulds slow cooling operation: being demoulded after the cooling 16h of ingot mould, demould rear cover ladle slow cooling 37h, can be obtained described
S50C medium carbon steel steel ingot.
The flaw detection qualification rate of S50C medium carbon steel steel ingot obtained by the present embodiment is 100%, hence it is evident that improves steel ingot internal soundness.
4: this S50C medium carbon steel of embodiment and its smelting process are described in detail below.
(1) the S50C medium carbon steel steel ingot that specification is 40 tons is smelted, composition by weight percent composition are as follows: C 0.50%, Si
0.25%, Mn 0.78%, P 0.012%, S 0.003%, Al 0.035%, Cr 0.32%, surplus are Fe and inevitable impurity.
(2) refining procedure: being refined using LF furnace, refines whole Argon, white slag retention time 37min, vacuum degree
28min is kept under 55Pa；6.5min is to bull ladle using soft blow mode, soft blow time 18min before vacuum breaking.
(3) be poured process: the ingot mould for selecting inner wall intact, for the control of the casting degree of superheat at 34 DEG C, steel ingot infuses speed 2.5t/
Min, the duration of pouring: Steel ingot feeder head 6min, ontology 10min.
(4) it demoulds slow cooling operation: being demoulded after the cooling 16.5h of ingot mould, demould rear cover ladle slow cooling 36h, institute can be obtained
The S50C medium carbon steel steel ingot stated.
The flaw detection qualification rate of S50C medium carbon steel steel ingot obtained by the present embodiment is 98%, hence it is evident that improves steel ingot internal soundness.
Claims (5)
1. a kind of S50C medium carbon steel and its smelting process, which is characterized in that it is at being grouped as and its weight percentage are as follows: C
0.49%~0.51%, Si 0.20%~0.32%, Mn 0.70%~0.80%, P≤0.015%, S≤0.005%, Al 0.020%~
0.050%, Cr 0.28%~0.35%, surplus are Fe and inevitable impurity.
2. a kind of smelting process of S50C medium carbon steel, it is characterised in that: it includes refining, pouring and demolding slow cooling operation；Gained
Steel ingot at being grouped as and its weight percentage are as follows: C 0.49%~0.51%, Si 0.20%~0.32%, Mn 0.70%~
0.80%, P≤0.015%, S≤0.005%, Al 0.020%~0.050%, Cr 0.28%~0.35%, surplus are Fe and can not keep away
The impurity exempted from；
The refining procedure: 25~30min is kept under the conditions of 30~40min of white slag retention time, 50~60Pa of vacuum degree；Vacuum
Preceding 5~7min is destroyed to bull ladle using soft blow mode, 15~25min of soft blow time；
The casting process: for the control of the casting degree of superheat at 33~37 DEG C, steel ingot infuses 2~2.5t/min of speed.
3. a kind of smelting process of S50C medium carbon steel according to claim 2, it is characterised in that: in the refining procedure,
Refine whole Argon.
4. a kind of smelting process of S50C medium carbon steel according to claim 2, which is characterized in that in the casting process
The duration of pouring are as follows: 4~6min of Steel ingot feeder head, 6~10min of ontology.
5. a kind of smelting process of S50C medium carbon steel according to claim 2,3 or 4, which is characterized in that the demoulding is slow
Cooling working procedure: it is demoulded after the cooling 15~17h of ingot mould, demoulds 35~40h of rear cover ladle slow cooling.
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| CN201910132578.5A CN109763075A (en) | 2019-02-22 | 2019-02-22 | A kind of S50C medium carbon steel and its smelting process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110284058A (en) * | 2019-06-19 | 2019-09-27 | 江阴兴澄特种钢铁有限公司 | A kind of high rigidity carbon mould bases steel |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013000791A (en) * | 2011-06-21 | 2013-01-07 | Jfe Steel Corp | Manufacturing method of steel material |
| CN105855485A (en) * | 2016-05-31 | 2016-08-17 | 舞阳钢铁有限责任公司 | Die casting method for medium carbon steel large ingot slab |
| CN106191632A (en) * | 2016-07-25 | 2016-12-07 | 柳州金特新型耐磨材料股份有限公司 | A kind of medium carbon steel steel-smelting production process method |
| CN109234508A (en) * | 2018-10-10 | 2019-01-18 | 邢台钢铁有限责任公司 | A kind of medium carbon steel wire rod and its production method with high intensity and high-ductility |
-
2019
- 2019-02-22 CN CN201910132578.5A patent/CN109763075A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013000791A (en) * | 2011-06-21 | 2013-01-07 | Jfe Steel Corp | Manufacturing method of steel material |
| CN105855485A (en) * | 2016-05-31 | 2016-08-17 | 舞阳钢铁有限责任公司 | Die casting method for medium carbon steel large ingot slab |
| CN106191632A (en) * | 2016-07-25 | 2016-12-07 | 柳州金特新型耐磨材料股份有限公司 | A kind of medium carbon steel steel-smelting production process method |
| CN109234508A (en) * | 2018-10-10 | 2019-01-18 | 邢台钢铁有限责任公司 | A kind of medium carbon steel wire rod and its production method with high intensity and high-ductility |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110284058A (en) * | 2019-06-19 | 2019-09-27 | 江阴兴澄特种钢铁有限公司 | A kind of high rigidity carbon mould bases steel |
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Application publication date: 20190517 |