CN105081295B - A kind of low carbon-structural steel smelting process for preventing steel ingot from needle pore defect occur - Google Patents
A kind of low carbon-structural steel smelting process for preventing steel ingot from needle pore defect occur Download PDFInfo
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Abstract
The present invention provides a kind of low carbon-structural steel smelting process for preventing steel ingot from needle pore defect occur, includes the following steps：EAF eccentric bottom tappings electric arc furnace smelting → LF external refinings → VD stoves Fruit storage → molding cast → breaking down cogging → one rolling of stick → flaw detection, to 0.8~1.3 DEG C/min of molding cast molten steel temperature decreasing value after VD stove Fruit storages；Pouring temperature is 1575~1585 DEG C in molding cast；It is that the ingot body teeming rate of ingot mould is 30~65kg/s, 5~15kg/s of cap mouth teeming rate of ingot mould that ingot mould wharve, molding teeming rate are used in molding cast.It is qualified that this method makes steel be detected by ultrasonic examination, meets to macrostructure requirement, the needle pore defect that the cross section acidleach macrostructure test pieces of steel is visible by naked eyes.
Description
Technical field
The invention belongs to metal materials to manufacture processing technique field, and in particular to a kind of to prevent steel ingot from needle pore defect occur
Low carbon-structural steel smelting process, referring in particular to steel grade main component is：[C] 0.10%~0.25%- [Mn] 0.50%~
1.50%- [S] 0.020%~0.035%- [Si] 0.00%~0.35%- [Cr] 0.50%~1.50%- [Ni] 0.00%~
The smelting technique of 0.010%~0.040% structural steel of 0.20%- [Al].
Background technology
Steel grade main component is：[C] 0.10%~0.25%- [Mn] 0.50%~1.50%- [S] 0.020%~
0.035%- [Si] 0.00%~0.35%- [Cr] 0.50%~1.50%- [Ni] 0.00%~0.20%- [Al] 0.010%
~0.040% structural steel is a series of low carbon-structural steels of Baosteel Special Steel Co., Ltd.'s production.It is mainly used for fabricating vapour
The drive gear materials such as vehicle, wind-driven generator there are certain requirements steel grade degree of purity, all have after Overheating Treatment good strong
Degree, hardness and toughness or surface abrasion resistance and center portion has good tough ballistic.To above-mentioned low carbon-structural steel finished product material
Material carries out magnetic leakage detection and ultrasonic examination.It is to macrostructure requirement：The cross section acidleach macrostructure test piece of steel must not
There are macroscopic shrinkage cavity, rimhole, crackle, burning, harmful field trash, skull patch and white point etc. harmful to processing and using
Defect.
The technological process of production：
40 tons of EAF+LF+VD of steel mill → molding bet 2.3t ingots → breaking down cogging → one rolling of stick → flaw detection (surface+
It detects a flaw at center)
It is average in the above-mentioned serial low carbon-structural steel finished-product material intra-company total cross-section flaw detection qualification rate of production in 2012
80.6%, major defect is needle pore defect, and defect concentrates on ingot butt center.And it is special using occurring when processing in user
Ungreat quality objection, causes user's process equipment to damage and pursues a claim, to company bring huge economic loss and
Adverse effect in market competition.
By consulting literatures data, there is the above-mentioned low carbon-structural steel material of production in domestic and international steel mill, it is believed that needle pore defect is logical
It often is happened at steel ingot top, hole is evenly distributed on steel section.Air inclusions content excessively causes to lack mainly in steel
It falls into and generates.The abundant degassing of Fruit storage is used in steelmaking process, prevents needle pore defect from generating.But above-mentioned serial low-carbon
Structural steel is all made of method described in document, does not have improvement to ingot butt center needle pore defect.
Publication No. CN1624182A discloses corrosion-resistive martensitic stainless steel having no pin hole defect and its manufacturing method, is related to
For manufacturing, table knife, knife, scissors, textile industry is spinned and highly corrosion resistant martensitic stain less steel and its manufacturer of braided support
Method, chemical composition, in terms of % weight, including C：0.12%~0.17%, Mn：2.0% or less, P：0.045% or more
Less, S：0.01% or less, Si：1.0% or less, Cr：12.5%~14.5%, N：0.06%~0.10%, C+N：
0.210%~0.265%, O：0.01% or less, the Fe of surplus and inevitable impurity, and present invention is mainly used for processing
The low carbon-structural steel of the transmission gears such as automobile, wind-driven generator is manufactured, chemical composition is different.
Invention content
In order to solve the problems, such as that needle pore defect occurs in production low carbon-structural steel steel ingot, it is anti-that the purpose of the present invention is to provide one kind
Only there is the low carbon-structural steel smelting process of needle pore defect in steel ingot, and the low carbon-structural steel that this method is produced passes through ultrasonic examination
Detection is qualified, meets to macrostructure requirement, the needle pore defect that the cross section acidleach macrostructure test pieces of steel is visible by naked eyes.
Technical solution of the invention is as follows：
The present invention provides a kind of low carbon-structural steel smelting process for preventing steel ingot from needle pore defect occur, includes the following steps：
EAF eccentric bottom tappings electric arc furnace smelting → LF external refinings → VD stoves Fruit storage → molding cast → breaking down cogging → stick
One rolling → flaw detection, it is characterised in that：
To 0.8~1.3 DEG C/min of molding cast molten steel temperature decreasing value after VD stove Fruit storages；
Pouring temperature is 1575~1585 DEG C in molding cast；
It is that the ingot body teeming rate of ingot mould is that ingot mould wharve, molding teeming rate are used in molding cast
30~65kg/s, 5~15kg/s of cap mouth teeming rate of ingot mould.
According to the low carbon-structural steel smelting process of the present invention for preventing steel ingot from needle pore defect occur, poured in the molding
In, it is " 6+7+4 " or " 6+8+4 ", molding cast speed to use 3 sets of ingot mould wharves, arrangement using molding 2.3 ingot shapes cast
Rate is following table：
According to the low carbon-structural steel smelting process of the present invention for preventing steel ingot from needle pore defect occur, it is preferred that in institute
It is 1580~1585 DEG C to state pouring temperature in molding cast.
According to the low carbon-structural steel smelting process of the present invention for preventing steel ingot from needle pore defect occur, it is preferred that described
Flaw detection includes surface inspection and center flaw detection.
According to the low carbon-structural steel smelting process of the present invention for preventing steel ingot from needle pore defect occur, it is preferred that in institute
It states in LF external refinings and has enough to meet the need mode, ladle interval time≤720min using double ladles.
According to the low carbon-structural steel smelting process of the present invention for preventing steel ingot from needle pore defect occur, in EAF bias
It taps in electric arc furnace smelting at bottom：
Arc furnace tapping requirement：P by percentage to the quality：0.005~0.012%, 1640~1670 DEG C of temperature, oxygen activity
600~1000ppm；
Eccentric bottom tapping, tapping process are added：0.5~1.0kg/t of Al ingots, SiAl2.5-3.0kg/t, FeSi30-
40kg/ stoves, lime 200~300kg/ stoves.
It is smart outside the LF stoves according to the low carbon-structural steel smelting process of the present invention for preventing steel ingot from needle pore defect occur
In refining, white slag is made in deoxidation, and slag making deoxidation uses SiFe powder, C powder；Using alloy electrolytic manganese, ferrosilicon, medium carbon ferrochrome, it is adjusted to
Part；
LF stoves analysis 1 adjusts Al mass percentage contents to 0.030~0.040%；
LF stoves are adjusted to 0.004~0.010% to the degree of S before VD stove bull ladles；
According to the low carbon-structural steel smelting process of the present invention for preventing steel ingot from needle pore defect occur, in the VD stoves vacuum
In degassing process,
Al to 0.050~0.055% is fed into VD stoves by percentage to the quality；
Into pump 3~8min of time, pressure 66.7Pa 10~20min of time are maintained；
Thermometric samples after moving back pump, moves back and adds carbonization rice husk to be uniformly added on the top of the slag in the top of the slag after pumping, addition is 20~25kg/
Stove；In the following order successively：Feed Al to 0.010~0.040%；Feed Si-Ca lines：0.20~0.25kg/t；Hello S to 0.020~
0.035% by percentage to the quality；
After VD, the weak 10~20min of mixing time of BOTTOM ARGON BLOWING, argon pressure and flow-rate adjustment do not rout up the top of the slag with molten steel
Subject to, within the scope of 0.8~1.3 DEG C/min of molten steel temperature decreasing value；
Liquidus curve：1511℃；Bull ladle temperature：1575~1585 DEG C.
According to the low carbon-structural steel smelting process of the present invention for preventing steel ingot from needle pore defect occur, it is preferred that in institute
Stating in molding cast uses argon for protecting pouring, ingot mould ingot body teeming rate to switch to cap mouth teeming rate and passed step by step in oblique line
Subtract after-teeming.
Detailed description of the invention：It is of the present invention to prevent the low carbon-structural steel smelting process that needle pore defect occurs in steel ingot：
1, the control of pouring temperature
[C] 0.10%~0.25%- [Mn] 0.50%~1.50%- [S] 0.020%~0.035%- [Si] 0.00%~
0.35%- [Cr] 0.50%~1.50%- [Ni] 0.00%~0.20%- [Al] 0.010%~0.040% low carbon-structural steel
Solid, liquid phase line passes through theoretical calculation, and intersection medium carbon steel, the solid-liquid phase line of bearing steel are relatively low.Detailed comparisons see the table below.
2. solid, liquid liquidus temperature of table presses theoretical formula method
| Solidus temperature (DEG C) | Liquidus temperature (DEG C) | Solidus line temperature gap (DEG C) | Technological temperature (DEG C) | |
| The application low carbon-structural steel | 1466 | 1511 | 45 | 1575~1585 |
| Medium carbon steel (45) | 1427 | 1487 | 60 | 1550~1560 |
| Bearing steel (GCr15) | 1328 | 1450 | 122 | 1500~1510 |
Using the molding narrow control technology of pouring temperature, i.e., pouring temperature is controlled at 1575~1585 DEG C after refining furnace processing,
And strive pouring temperature control within the scope of -5 DEG C of the upper limit, that is, strive 1580~1585 DEG C.Above-mentioned low carbon-structural steel solid liquid phase
Line range is smaller, is controlled using medium carbon steel or bearing steel pouring temperature, when ingot solidification after molding is poured into a mould will occur, solid-liquid phase line
Temperature range is small, and each crystallization nuclei is grown up in the form of dendritic crystal in two-phase section, interlaced due to dendrite, not
The molten steel of solidification is divided into several small parts, and the crystallization of liquid, which is shunk, in each section separated independently carries out, in ingot solidification
Be cannot get molten steel supplement in the case of, just inevitably steel ingot central area formed hole, by flaw detection sample after
Sample central area shows tiny pin hole.So molding pouring temperature uses narrow control technology after refining furnace processing.
Reduction refining VD stoves vacuum processing, which is finished to molding, pours into a mould molten steel temperature decreasing value, and carbonization is added after vacuum processing
Rice husk (amounts to 20~25kg/ stoves).It is found by experiment that carbonization rice husk is covered in the top of the slag top of the slag can be effectively ensured to be not crusted, protect
Card refining VD stoves vacuum processing is finished to 0.8~1.3 DEG C/min of molding cast molten steel temperature decreasing value, preferably 0.9~
1.0℃/min。
Production has enough to meet the need mode using double ladles, forbids the ladle using ladle interval time >=720 minute, it is ensured that molding is poured
Temperature control is noted, the influence that ladle liner refractory material absorbs heat to molten steel temperature is reduced, ensures that refining VD stoves vacuum processing finishes
To 0.8~1.3 DEG C/min of molding cast molten steel temperature decreasing value.
2, molding teeming rate control
Using molding teeming rate control technology.It is " 6+ to mold 2.3 ingot shapes and use 3 sets of ingot mould wharves, arrangement
7+4 " or " 6+8+4 " (mold 3 pieces of steel ingot chassis arrangements of time-division, ingot mould arrangement divides 674 on each piece of steel ingot chassis
Or 68 4).It is summarized with field experience by calculating, table handling is pressed in molding teeming rate control：
Table 3. molds teeming rate control
Note：Ingot mould ingot body teeming rate switches to cap mouth teeming rate and successively decreases step by step after-teeming in oblique line.
Prevent molding teeming rate too fast or or it is slow and directly by rate variation greatly, so that molten steel in ingot mould is refunded
Uneven situation is flowed and filled, and then generates needle pore defect.
The advantageous effects of the present invention：
The present invention provides a kind of low carbon-structural steel smelting process for preventing steel ingot from needle pore defect occur, and this method keeps steel logical
It is qualified to cross ultrasonic examination detection, meets to macrostructure requirement, the cross section acidleach macrostructure test piece of steel can without naked eyes
The needle pore defect seen, to preventing low carbon-structural steel ingot needle pore defect quite apparent.
The application molds the narrow control technology of pouring temperature, i.e., pouring temperature control is 1575~1585 after refining furnace processing
DEG C, and strive pouring temperature control within the scope of -5 DEG C of the upper limit, that is, strive 1580~1585 DEG C.Instead of the essence of former technological requirement
At 1565~1580 DEG C, pouring temperature controls within the scope of ± 15 DEG C for pouring temperature control after furnace processing.It effectively prevent low-carbon
Structural steel solid-liquid phase line range is smaller, forms hole in steel ingot central area, leads to the generation of needle pore defect.
The application is produced has enough to meet the need mode using double ladles, forbids the ladle using ladle interval time >=720 minute.Ensure
Pouring temperature control is molded, the influence that ladle liner refractory material absorbs heat to molten steel temperature is reduced, is ensured at refining VD stove vacuum
Reason is finished to 0.8~1.3 DEG C/min of molding cast molten steel temperature decreasing value.
The application is using molding teeming rate control technology, instead of 2.3 ingot shape duration of pouring ingot body 3' of former technological requirement
The molding duration of pouring control technology of 30 "~4'30 " cap mouths >=2'30 ".Prevent molding teeming rate too fast or or slow and straight
It connects rate variation greatly, makes molten steel in ingot mould occur refunding stream and the uneven situation of filling, and then generate needle pore defect.
After using the application method, the follow-up series low carbon-structural steel result is smelted：Produce within 2013 the series low-carbon
(production improvement experiment in interim 1 to May intra-company cuts structural steel intra-company total cross-section flaw detection qualification rate average 92.49% entirely
Face flaw detection qualification rate average 88.31%, 6 to December is average using this patent method intra-company total cross-section flaw detection qualification rate
95.47%).The cross section acidleach macrostructure test piece of steel finds no macroscopic needle pore defect.
Description of the drawings
Fig. 1 is to implement low-carbon obtained by the low carbon-structural steel smelting process provided by the invention for preventing steel ingot from needle pore defect occur
The macrostructure photo of structural steel, no pin-hole defect；
Fig. 2 is the macrostructure photo that low carbon-structural steel obtained by smelting process provided by the invention is not carried out, and has pin hole to lack
It falls into.
Specific implementation mode
For a better understanding of the present invention, with reference to the embodiment content that the present invention is furture elucidated, but the present invention
Content is not limited solely to the following examples.
The method of detection of low carbon-structural steel according to the present invention and instrument：It is marked using country of the People's Republic of China (PRC)
Quasi- forging rolling rod iron supersonic testing method, standard No. GB/T4162-1991.The method of inspection uses longitudinal wave reflection method, to a diameter of
81 to 250mm rod iron, is tested using contact method, according to the quality etc. of regulation judgement ultrasonic inspection in above-mentioned standard
Grade.Defect-detecting equipment is GE companies ROTA130S ultrasonic testing systems.Its index meets claimed below：Surplus sensitivity is not less than
36dB；Vertical linearity error is not more than 6%；Horizontal linearity error is not more than 2%；Dynamic range is not less than 30dB；Attenuator essence
Degree has 12dB ± 1.0dB.
One, implement smelting process using the present invention and result of detection：
1, EAF technological requirements：
Electric furnace steel tapping requirement：[P] 0.005~0.012%；1640~1670 DEG C of T (DEG C), 600~1000ppm of oxygen activity；
Eccentric bottom tapping, tapping process are added：0.5~1.0kg/t of deoxidier Al ingots, SiAl：2.5-3.0kg/t
FeSi：30-40kg/ stoves, lime 200~300kg/ stoves；
2, LF furnace technologies requirement
Mode is had enough to meet the need using double a ladles；
LF stove deoxidations work is carried out, and white slag is made, and slag making deoxidation is used with SiFe powder, C powder；Composition, electricity are adjusted using alloy
Xie Meng, ferrosilicon, medium carbon ferrochrome；
LF stoves analysis 1 is with [Al] to 0.030~0.040%；
LF stoves are to [S] before VD stove bull ladles to 0.004~0.010%；
3, VD furnace technologies requirement
Al to 0.050~0.055% is fed into VD；
Strive 3~8min, 66.7Pa 10~20min of time into the pump time；
Thermometric samples after moving back pump, moves back and adds carbonization rice husk to be uniformly added on the top of the slag 20~25kg/ stoves in the top of the slag after pumping；According to analysis
As a result Composition Control as required；In the following order successively：Feed Al to 0.010~0.040%；Feed Si-Ca lines：0.20~
0.25kg/t；Feed S to 0.020~0.035%；
After VD, the weak mixing time of BOTTOM ARGON BLOWING must be 10~20 minutes, and argon pressure and flow-rate adjustment are not turned over molten steel
Go out subject to the top of the slag, within the scope of 0.8~1.3 DEG C/min of molten steel temperature decreasing value；
Liquidus curve：1511℃；Bull ladle temperature：1575~1585 DEG C, and strive controlling pouring temperature in -5 DEG C of models of the upper limit
In enclosing, that is, strive 1580~1585 DEG C.
4, pouring technology is molded
Use argon for protecting pouring；
2.3t ingots are poured into a mould, table handling is pressed in molding teeming rate control：
Table 4. molds teeming rate control
Note：Ingot mould ingot body teeming rate switches to cap mouth teeming rate and successively decreases step by step after-teeming in oblique line.
It pours to finish and caps a mouthful 6~10kg of exothermic mixture every；
5, result of detection see the table below：
Table 5
Two, former smelting process and result of detection are implemented in comparison：
1, EAF technological requirements：
Electric furnace steel tapping requirement：[P] 0.005~0.012%；1640~1670 DEG C of T (DEG C), 600~1000ppm of oxygen activity；
Eccentric bottom tapping, tapping process are added：0.5~1.0kg/t of deoxidier Al ingots, SiAl：2.5-3.0kg/t
FeSi：30-40kg/ stoves, lime 200~300kg/ stoves；
2, LF furnace technologies requirement
Mode is had enough to meet the need using three ladles；
LF stove deoxidations work is carried out, and white slag is made, and slag making deoxidation is used with SiFe powder, C powder；Composition, electricity are adjusted using alloy
Xie Meng, ferrosilicon, medium carbon ferrochrome；
LF stoves analysis 1 is with [Al] to 0.030~0.040%；
LF stoves are to [S] before VD stove bull ladles to 0.004~0.010%；
3, VD furnace technologies requirement
Al to 0.050~0.055% is fed into VD；
Strive 3~8min, 66.7Pa 10~20min of time into the pump time；
Thermometric samples after moving back pump, moves back and adds carbonization rice husk to be uniformly added on the top of the slag 20~25kg/ stoves in the top of the slag after pumping；According to analysis
As a result Composition Control as required；In the following order successively：Feed Al to 0.010~0.040%；Feed Si-Ca lines：0.20~
0.25kg/t；Feed S to 0.020~0.035%；
After VD, the weak mixing time of BOTTOM ARGON BLOWING must be 10~20 minutes, and argon pressure and flow-rate adjustment are not turned over molten steel
Go out subject to the top of the slag；
Liquidus curve：1511℃；Bull ladle temperature：1565~1580 DEG C.
4, pouring technology is molded
Use argon for protecting pouring；
2.3t ingots are poured into a mould, molding teeming rate control is operated by the duration of pouring：2.3 ingot shape duration of pouring ingot body 3'30 "~
The molding duration of pouring control technology of 4'30 " cap mouth >=2'30 ".
It pours to finish and caps a mouthful 6~10kg of exothermic mixture every；
5, result of detection see the table below：
Table 6
Three, implement the application method and implement front and back flaw detection qualification rate comparison：
Table 7
| Month | Implement first 2012 | 2013 after implementation |
| January | 85.24% | 90.33% |
| 2 months | 88.63% | 81.82% |
| March | 85.62% | 88.21% |
| April | 78.49% | 92.34% |
| May | 80.90% | 88.86% |
| June | 78.43% | 94.26% |
| July | 76.29% | 96.78% |
| August | 73.56% | 96.21% |
| September | 74.93% | 94.28% |
| October | 83.19% | 95.84% |
| November | 80.32% | 94.84% |
| December | 82.33% | 96.11% |
| Average value | 80.66% | 92.49% |
After using a kind of low carbon-structural steel smelting process for preventing steel ingot from needle pore defect occur provided by the present application, smelt
The follow-up series low carbon-structural steel result：It is flat to produce within 2013 the series low carbon-structural steel intra-company total cross-section flaw detection qualification rate
Equal 92.49% (production improvement experiment in interim 1 to May intra-company total cross-section flaw detection qualification rate average 88.31%, 6 to December
It is average 95.47%) using this patent method intra-company total cross-section flaw detection qualification rate.The cross section acidleach macrostructure of steel tries
Piece finds no macroscopic needle pore defect.
Four, the performance detection of the low carbon-structural steel involved by the application：
Grain size detects, using National Standard of the People's Republic of China's metal mean grain size assay method, standard No.
GB/T6394-2002.It is to evaluate mean grain size by being compared with standard series judge picture using comparison method.
2013 1 are 7.0 grades to grain size average value in June, and 2013 7 to average value in December are 7.0 grades.This hair
Bright patent prevents low carbon-structural steel needle pore defect, while properties of product are also kept.
Five, the application implements front and back low carbon-structural steel macrostructure comparison, sees attached drawing 1 and attached drawing 2.
Claims (8)
1. a kind of low carbon-structural steel smelting process for preventing steel ingot from needle pore defect occur, includes the following steps：EAF eccentric bottom tappings
Electric arc furnace smelting → LF external refinings → VD stoves Fruit storage → molding cast → breaking down cogging → one rolling of stick → flaw detection,
It is characterized in that：
To 0.8~1.3 DEG C/min of molding cast molten steel temperature decreasing value after VD stove Fruit storages；
Pouring temperature is 1575~1585 DEG C in molding cast；
Use ingot mould wharve in molding cast, molding teeming rate be the ingot body teeming rate of ingot mould be 30~
65kg/s, 5~15kg/s of cap mouth teeming rate of ingot mould；
In molding cast, 3 sets ingot mould wharves are used using molding 2.3 ingot shapes cast, arrangement for " 6+7+4 " or
" 6+8+4 ", molding teeming rate are following table：
2. preventing steel ingot from the low carbon-structural steel smelting process of needle pore defect occur according to claim 1, which is characterized in that
Pouring temperature is 1580~1585 DEG C in the molding cast.
3. preventing steel ingot from the low carbon-structural steel smelting process of needle pore defect occur according to claim 1, which is characterized in that institute
It includes surface inspection and center flaw detection to state flaw detection.
4. preventing steel ingot from the low carbon-structural steel smelting process of needle pore defect occur according to claim 1, which is characterized in that
In the LF external refinings mode, ladle interval time≤720min are had enough to meet the need using double ladles.
5. preventing steel ingot from the low carbon-structural steel smelting process of needle pore defect occur according to claim 1, which is characterized in that
In the EAF eccentric bottom tappings electric arc furnace smelting：
Arc furnace tapping requirement：P by percentage to the quality：0.005~0.012%, 1640~1670 DEG C of temperature, oxygen activity 600
~1000ppm；
Eccentric bottom tapping, tapping process are added：0.5~1.0kg/t of Al ingots, SiAl 2.5-3.0kg/t, FeSi30-40kg/
Stove, lime 200~300kg/ stoves.
6. preventing steel ingot from the low carbon-structural steel smelting process of needle pore defect occur according to claim 1, which is characterized in that
In the LF external refinings, white slag is made in deoxidation, adjusts composition；
LF stoves analysis 1 adjusts Al mass percentage contents to 0.030~0.040%；
LF stoves are adjusted to 0.004~0.010% to the degree of S before VD stove bull ladles.
7. preventing steel ingot from the low carbon-structural steel smelting process of needle pore defect occur according to claim 1, which is characterized in that
In the VD stoves Fruit storage,
Al to 0.050~0.055% is fed into VD stoves by percentage to the quality；
Into pump 3~8min of time, pressure 66.7Pa 10~20min of time are maintained；
Thermometric samples after moving back pump, moves back and adds carbonization rice husk to be uniformly added on the top of the slag in the top of the slag after pumping, addition is 20~25kg/ stoves；It presses
Following sequence is successively：Feed Al to 0.010~0.040%；Feed Si-Ca lines：0.20~0.25kg/t；Hello S to 0.020~
0.035% by percentage to the quality；
After VD, the weak 10~20min of mixing time of BOTTOM ARGON BLOWING, argon pressure and flow-rate adjustment do not rout up the top of the slag with molten steel and are
Standard, within the scope of 0.8~1.3 DEG C/min of molten steel temperature decreasing value；
Liquidus curve：1511℃；Bull ladle temperature：1575~1585 DEG C.
8. preventing steel ingot from the low carbon-structural steel smelting process of needle pore defect occur according to claim 1, which is characterized in that
Use argon for protecting pouring in molding cast, ingot mould ingot body teeming rate switches to cap mouth teeming rate in oblique line step by step
Successively decrease after-teeming.
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| CN106319135B (en) * | 2016-11-24 | 2018-05-29 | 新兴铸管股份有限公司 | The method that the fluctuation of C, Mn elemental composition is prevented for smelting process |
| CN109880966A (en) * | 2019-02-26 | 2019-06-14 | 舞阳钢铁有限责任公司 | A kind of smelting process of large-sized forging ingot S35C steel |
| CN110867220A (en) * | 2019-11-07 | 2020-03-06 | 西安交通大学 | Method for researching in-core eutectic reaction and high-temperature melting behavior by particle grid mixing method |
| CN113770316B (en) * | 2021-08-19 | 2022-11-04 | 山西太钢不锈钢股份有限公司 | Method for improving low-carbon, low-aluminum and high-chromium steel forging circle flaw detection qualification rate |
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| CN101274356A (en) * | 2008-05-16 | 2008-10-01 | 山西太钢不锈钢股份有限公司 | Dead-melted steel ingot and mold and casting method thereof |
| CN101660023A (en) * | 2009-09-25 | 2010-03-03 | 首钢总公司 | Steel ladle bottom argon blowing technology for removing non-metallic inclusion in molten steel |
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