CN109825670A - A kind of production method of large size chrome molybdenum steel ingot - Google Patents
A kind of production method of large size chrome molybdenum steel ingot Download PDFInfo
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- CN109825670A CN109825670A CN201910092617.3A CN201910092617A CN109825670A CN 109825670 A CN109825670 A CN 109825670A CN 201910092617 A CN201910092617 A CN 201910092617A CN 109825670 A CN109825670 A CN 109825670A
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a kind of production methods of large-scale chrome molybdenum steel ingot comprising just refining, refining and molding operations；It is described just to refine process: P≤0.008% when control tapping, 1580~1600 DEG C of tapping temperature；The refining procedure: including LF refining and VD vacuum process；Deoxidier must not be added in LF refining process, and temperature is controlled at 1560 DEG C~1600 DEG C；30~35min of white slag retention time, total 45~50min of refining time；In VD vacuum process, forbid feeding Al after vacuumizing, ladle stops opening the calm time before pouring to casting line after argon to be 17~20 minutes；The molding operations: the duration of pouring is ingot shape riser 5~7 minutes, ontology 17~22 minutes.The method reduces the flaw detections as caused by working-procedure problem in steelmaking process not to conform to problem, improves steel plate inspection qualification rate, greatly reduces feed supplement caused by not conforming to as flaw detection, hence it is evident that improve steel ingot internal soundness, effectively improve lumber recovery.
Description
Technical field
The present invention relates to a kind of production method of steel ingot, especially a kind of production method of large-scale chrome molybdenum steel ingot.
Background technique
Chrome-molybdenum steel is as the common main heat resisting steel of container, and due to the addition of alloying element, this steel has preferable heat strong
Property and high temperature resistant property；It is used in the reactors such as large-scale hydrogenator, gasification furnace and coke drum.But it is big with device
The raising of type and design requirement, required steel plate thickness are in increase trend, and previous continuous casting and small-sized steel ingot have been unable to satisfy steel
Plate production needs.To guarantee steel plate weight, the specification of chrome molybdenum steel ingot need to be improved.But with the expansion of steel ingot specification, tradition
Smelting and pouring technology be unable to satisfy the above demand, the steel plate of production has that flaw detection qualification rate is relatively low, causes steel
Plate flaw detection feed supplement, had not only increased production cost but also had postponed the delivery cycle of steel plate, and influenced 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 production methods of large-scale chrome molybdenum steel ingot, to improve product
Flaw detection qualification rate.
In order to solve the above technical problems, the technical solution used in the present invention is: it includes first refining, refining and molding work
Sequence；It is described just to refine process: P≤0.008% when control tapping, 1580~1600 DEG C of tapping temperature；
The refining procedure: including LF refining and VD vacuum process；Deoxidier, temperature control must not be added in LF refining process
At 1560 DEG C~1600 DEG C；30~35min of white slag retention time, total 45~50min of refining time；In VD vacuum process,
Forbid feeding Al after vacuumizing, ladle stops opening the calm time before pouring to casting line after argon to be 17~20 minutes；
The molding operations: the duration of pouring is ingot shape riser 5~7 minutes, ontology 17~22 minutes.
In just refining process of the present invention, weight is always added as raw material, the pig iron and molten iron Zhan using the pig iron, molten iron and steel scrap
The 40~60% of amount.
During LF refining of the present invention, seat packet power transmission is refined, 900~1000kg of lime is added；Aluminum steel has been fed to hanging
Wrapping the time skimmed is 25~30 minutes.
In VD vacuum process of the present invention, 20~25min of vacuum retention time.
In molding operations of the present invention, mould eye two sides respectively add 10~30kg continuous casting covering slag, and 20~45kg of hanging is compound
Slag/formwork；3.0~3.7t/min of steel -passing amount when steel ingot casting.
The beneficial effects of adopting the technical scheme are that the present invention solves conventional method production large-scale steel ingot
The flaw detection qualification rate of the relatively low problem of flaw detection qualification rate, steel plate has been increased to 95~97% by 90~92% before；The present invention subtracts
The flaw detection as caused by working-procedure problem in steelmaking process is lacked and has not conformed to problem, has improved steel plate inspection qualification rate, greatly reduce
Feed supplement caused by not conformed to as flaw detection, hence it is evident that improve steel ingot internal soundness, effectively improve lumber recovery.
Specific embodiment
The present invention will be further described in detail with reference to the specific embodiments.
The production method of this large size chrome molybdenum steel ingot includes that just refining, refining and molding operations, each process technique are as described below:
(1) it just refines process: being always added the 40~60% of weight as raw material, the pig iron and molten iron Zhan using the pig iron, molten iron and steel scrap, reduce
Steel scrap is added；P≤0.008% when control tapping, 1580~1600 DEG C of tapping temperature.
(2) refining procedure: including LF refining and VD vacuum process.When LF refining, seat packet power transmission is refined, lime is added
900~1000kg；Deoxidier must not be added in LF refining process, and temperature is controlled at 1560 DEG C~1600 DEG C；Aluminum steel has been fed to bull ladle
The time skimmed is 25~30 minutes, 30~35min of white slag retention time, total 45~50min of refining time.VD was vacuum-treated
Cheng Zhong, 20~25min of vacuum retention time forbid feeding Al after vacuumizing, and extremely casting line opens the calm time before pouring after ladle stops argon
It is 17~20 minutes.
(3) molding operations: mould eye two sides respectively add 1~2 bag of continuous casting covering slag, every bag of 10~15kg；2~3 bags of hanging is compound
Slag/formwork, every bag of 10~15kg, composite slag hanging is to the upper edge in ingot mould inside, when then composite slag works steel contacts；
The duration of pouring: ingot shape riser 5~7 minutes, ontology 17~22 minutes；3.0~3.7t/min of steel -passing amount is when steel ingot casting to get arriving
The steel ingot.
(4) specification of steel ingot obtained by this method is 50~53 tons, chemical component composition and its mass percentage are as follows: C
0.12%~0.14%, Si 0.06%~0.08%, Mn 0.50%~0.60%, P≤0.007%, S≤0.004%, Mo 0.90%~
1.10%, Cr 2.40%~2.50%, surplus are Fe and inevitable impurity.Due to the intrinsic solidification mode of steel ingot, it is easy to make
There is shrinkage cavity or field trash at core not float sufficiently, the steel plate of production is caused to be easy to appear area and dotted intensive lack
It falls into, flaw detection is caused not conform to.This production method passes through molding by optimizing to refining in smelting and vacuum processing
Process covering slag utilizes and the duration of pouring controls, hence it is evident that improves the flaw detection qualification rate of steel plate.
Embodiment 1: the production method of this large size chrome molybdenum steel ingot uses following concrete technologies.
(1) process is just refined: the 40% of the pig iron and the total additional amount of molten iron Zhan；P 0.008% when tapping, 1580 DEG C of tapping temperature.
(2) refining procedure: lime 900kg is added in refining seat packet power transmission, and deoxidier, temperature control must not be added in refining process
For system at 1560~1580 DEG C, refining has fed aluminum steel by bull ladle slag-removing time 25 minutes, white slag retention time 30min, always when refining
Between 45min.VD vacuum retention time 20min when ingot smelting, forbids feeding Al after vacuumizing, ladle stops after argon to casting line to open pour before
17 minutes calm time.
(3) molding operations: mould eye two sides respectively add 1 bag of (10kg/ bags) continuous casting covering slag, and 2 bags of hanging (10kg/ bags) is compound
Slag/formwork, the duration of pouring: ingot shape riser 5 minutes, ontology 17 minutes, steel -passing amount 3.0t/min was to get to required when steel ingot casting
Steel ingot.
(4) specification of steel ingot obtained by the present embodiment is 50 tons, chemical component composition and mass percentage are as follows: C 0.14%,
Si 0.07%, Mn 0.60%, P 0.006%, S 0.003%, Mo 1.10%, Cr 2.50%, surplus be Fe and inevitably it is miscellaneous
Matter.Steel plate is made in steel ingot obtained by the present embodiment, and the flaw detection qualification rate of steel plate is 95%, it is seen that this method significantly improves in steel ingot
Portion's quality.
Embodiment 2: the production method of this large size chrome molybdenum steel ingot uses following concrete technologies.
(1) process is just refined: the 60% of the pig iron and the total additional amount of molten iron Zhan；P 0.007% when tapping, 1600 DEG C of tapping temperature.
(2) refining procedure: lime 1000kg is added in refining seat packet power transmission, and deoxidier, temperature control must not be added in refining process
For system at 1580~1600 DEG C, refining has fed aluminum steel by bull ladle slag-removing time 30 minutes, white slag retention time 35min, always when refining
Between 50min.VD vacuum retention time 25min when ingot smelting, forbids feeding Al after vacuumizing, ladle stops after argon to casting line to open pour before
20 minutes calm time.
(3) molding operations: mould eye two sides respectively add 2 bags of (15kg/ bags) continuous casting covering slags, and 3 bags of hanging (15kg/ bags) is compound
Slag/formwork, the duration of pouring: ingot shape riser 7 minutes, ontology 22 minutes, steel -passing amount 3.7t/min was to get to required when steel ingot casting
Steel ingot.
(4) specification of steel ingot obtained by the present embodiment is 51.5 tons, steel chemical composition composition and mass percentage are as follows: C
0.12%, Si 0.06%, Mn 0.50%, P 0.007%, S 0.004%, Mo 0.90%, Cr 2.40%, surplus are Fe and can not keep away
The impurity exempted from.Steel plate is made in steel ingot obtained by the present embodiment, and the flaw detection qualification rate of steel plate is 96%, it is seen that this method significantly improves
Steel ingot internal soundness.
Embodiment 3: the production method of this large size chrome molybdenum steel ingot uses following concrete technologies.
(1) process is just refined: the 50% of the pig iron and the total additional amount of molten iron Zhan；P 0.006% when tapping, 1590 DEG C of tapping temperature.
(2) refining procedure: lime 950kg is added in refining seat packet power transmission, and deoxidier, temperature control must not be added in refining process
For system at 1570~1590 DEG C, refining has fed aluminum steel by bull ladle slag-removing time 27 minutes, white slag retention time 34min, always when refining
Between 47min.VD vacuum retention time 24min when ingot smelting, forbids feeding Al after vacuumizing, ladle stops after argon to casting line to open pour before
18 minutes calm time.
(3) molding operations: mould eye two sides respectively add 2 bags of (10kg/ bags) continuous casting covering slags, and 3 bags of hanging (10kg/ bags) is compound
Slag/formwork, the duration of pouring: ingot shape riser 6 minutes, ontology 18 minutes, steel -passing amount 3.5t/min was to get to required when steel ingot casting
Steel ingot.
(4) specification of steel ingot obtained by the present embodiment is 53 tons, and steel chemical composition composition and mass percentage satisfaction are following
It is required that: C 0.13%, Si 0.07%, Mn 0.55%, P 0.005%, S 0.003%, Mo 1.00%, Cr 2.45%, surplus be Fe and
Inevitable impurity.Steel plate is made in steel ingot obtained by the present embodiment, and the flaw detection qualification rate of steel plate is 97%, it is seen that this method is obvious
Improve steel ingot internal soundness.
Embodiment 4: the production method of this large size chrome molybdenum steel ingot uses following concrete technologies.
(1) process is just refined: the 55% of the pig iron and the total additional amount of molten iron Zhan；P 0.006% when tapping, 1585 DEG C of tapping temperature.
(2) refining procedure: lime 980kg is added in refining seat packet power transmission, and deoxidier, temperature control must not be added in refining process
For system at 1565~1585 DEG C, refining has fed aluminum steel by bull ladle slag-removing time 28 minutes, white slag retention time 32min, always when refining
Between 48min.VD vacuum retention time 22min when ingot smelting, forbids feeding Al after vacuumizing, ladle stops after argon to casting line to open pour before
19 minutes calm time.
(3) molding operations: mould eye two sides respectively add 1 bag of (15kg/ bags) continuous casting covering slag, and 3 bags of hanging (10kg/ bags) is compound
Slag/formwork, the duration of pouring: ingot shape riser 6 minutes, ontology 20 minutes, steel -passing amount 3.2t/min was to get to required when steel ingot casting
Steel ingot.
(4) specification of steel ingot obtained by the present embodiment is 52 tons, and steel chemical composition composition and mass percentage satisfaction are following
It is required that: C 0.13%, Si 0.08%, Mn 0.57%, P 0.004%, S 0.002%, Mo 1.02%, Cr 2.43%, surplus be Fe and
Inevitable impurity.Steel plate is made in steel ingot obtained by the present embodiment, and the flaw detection qualification rate of steel plate is 97%, it is seen that this method is obvious
Improve steel ingot internal soundness.
Claims (5)
1. a kind of production method of large size chrome molybdenum steel ingot, it is characterised in that: it includes first refining, refining and molding operations；It is described
Just refine process: P≤0.008% when control tapping, 1580~1600 DEG C of tapping temperature；
The refining procedure: including LF refining and VD vacuum process；Deoxidier, temperature control must not be added in LF refining process
At 1560 DEG C~1600 DEG C；30~35min of white slag retention time, total 45~50min of refining time；In VD vacuum process,
Forbid feeding Al after vacuumizing, ladle stops opening the calm time before pouring to casting line after argon to be 17~20 minutes；
The molding operations: the duration of pouring is ingot shape riser 5~7 minutes, ontology 17~22 minutes.
2. a kind of production method of large-scale chrome molybdenum steel ingot according to claim 1, it is characterised in that: described just to refine process
In, the 40~60% of weight is always added as raw material, the pig iron and molten iron Zhan using the pig iron, molten iron and steel scrap.
3. a kind of production method of large-scale chrome molybdenum steel ingot according to claim 1, it is characterised in that: the LF refining mistake
Cheng Zhong refines seat packet power transmission, and 900~1000kg of lime is added；Having fed the time that aluminum steel is skimmed to bull ladle is 25~30 minutes.
4. a kind of production method of large-scale chrome molybdenum steel ingot according to claim 1, it is characterised in that: at the VD vacuum
During reason, 20~25min of vacuum retention time.
5. a kind of production method of large-scale chrome molybdenum steel ingot according to any one of claims 1-4, it is characterised in that:
In the molding operations, mould eye two sides respectively add 10~30kg continuous casting covering slag, hang 20~45kg composite slag/formwork；Steel ingot pours
3.0~3.7t/min of steel -passing amount when casting.
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| CN102965589A (en) * | 2012-12-13 | 2013-03-13 | 湘潭华进科技有限公司 | Mechanical expanding machine pull rod shaft with high fatigue strength and preparation method thereof |
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| CN108715912A (en) * | 2018-06-07 | 2018-10-30 | 舞阳钢铁有限责任公司 | A kind of method of electric furnace smelting low nitrogen steel |
| CN109136743A (en) * | 2018-07-13 | 2019-01-04 | 舞阳钢铁有限责任公司 | A kind of 1 grade of equipment large-scale steel ingot of nuclear power projects core and its production method |
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2019
- 2019-01-30 CN CN201910092617.3A patent/CN109825670A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102965589A (en) * | 2012-12-13 | 2013-03-13 | 湘潭华进科技有限公司 | Mechanical expanding machine pull rod shaft with high fatigue strength and preparation method thereof |
| CN103710628A (en) * | 2013-12-30 | 2014-04-09 | 南阳汉冶特钢有限公司 | Large-thickness hydrogenating 14Cr1MoR steel plate and production method thereof |
| CN104561772A (en) * | 2014-12-26 | 2015-04-29 | 南阳汉冶特钢有限公司 | Ultralow-temperature steel plate with thickness of 130-150 mm and production method for ultralow-temperature steel plate |
| CN108715912A (en) * | 2018-06-07 | 2018-10-30 | 舞阳钢铁有限责任公司 | A kind of method of electric furnace smelting low nitrogen steel |
| CN109136743A (en) * | 2018-07-13 | 2019-01-04 | 舞阳钢铁有限责任公司 | A kind of 1 grade of equipment large-scale steel ingot of nuclear power projects core and its production method |
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Application publication date: 20190531 |