CN105081295A - Low-carbon structural steel smelting method for preventing pinhole defects appearing in steel ingot - Google Patents
Low-carbon structural steel smelting method for preventing pinhole defects appearing in steel ingot Download PDFInfo
- Publication number
- CN105081295A CN105081295A CN201410217768.4A CN201410217768A CN105081295A CN 105081295 A CN105081295 A CN 105081295A CN 201410217768 A CN201410217768 A CN 201410217768A CN 105081295 A CN105081295 A CN 105081295A
- Authority
- CN
- China
- Prior art keywords
- ingot
- steel
- stove
- die casting
- low carbon
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a low-carbon structural steel smelting method for preventing pinhole defects appearing in a steel ingot. The method comprises the following steps of EAF eccentric bottom tapping electric-arc furnace smelting, LF external refining, VD furnace vacuum degassing treatment, mold casting pouring, primary rolling and cogging, rod operation, rolling and flaw detection. After VD furnace vacuum degassing treatment is performed, the temperature decreasing value of mold casting pouring molten steel is 0.8-1.3 DEG C/min. The pouring temperature in mold casting pouring is 1575-1585 DEG C. A steel ingot mold stool is used for mold casting pouring. The mold casting pouring rate is the ingot body pouring rate of a steel ingot mold and is 30-65 kg/s. The cap section pouring rate of the steel ingot mold is 5-15 kg/s. According to the method, qualified products are detected through ultrasonic flaw detection, the requirement for macrostructure inspection is met, and no macroscopic pinhole defect exists in an acid dipping macrostructure test piece of the cross section of steel.
Description
Technical field
The invention belongs to metal material and manufacture processing technique field, be specifically related to a kind of low carbon-structural steel smelting process preventing steel ingot from occurring needle pore defect, referring in particular to steel grade main component is: the smelting technique of [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.
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 that Baosteel Special Steel Co., Ltd. produces.Be mainly used in the drive gear materials such as processing and manufacturing automobile, wind-driven generator, steel grade degree of purity there are certain requirements, after Overheating Treatment, all possess good intensity, hardness and toughness, or surface abrasion resistance and heart portion has good tough ballistic.Magnetic leakage detection and ultrasonic examination are carried out to above-mentioned low carbon-structural steel finished-product material.To macrostructure requirement be: the cross section acidleach macrostructure test piece of steel must not have macroscopic shrinkage cavity, rimhole, crackle, burning, harmful field trash, skull patch and white point etc. to processing and using harmful defect.
The technological process of production:
Steel mill 40 tons of EAF+LF+VD → die casting bet 2.3t ingot → breaking down cogging → excellent rolling → flaw detection (surface+center flaw detection)
Produced above-mentioned serial low carbon-structural steel finished-product material intra-company total cross-section flaw detection qualification rate average 80.6% in 2012, major defect is needle pore defect, and defect concentrates on ingot butt center.And add the great especially quality objection of generation in man-hour in user's use, cause user's process equipment damage and pursue a claim, thus bring the adverse effect in huge economic loss and market competition to company.
By By consulting literatures data, all there is the above-mentioned low carbon-structural steel material of production in domestic and international steel mill, and think that needle pore defect usually occurs in steel ingot top, porous nickel is distributed on steel section.Mainly in steel, air inclusions content too much causes defect to produce.In steelmaking process, adopt Fruit storage fully to degas, prevent needle pore defect from producing.But above-mentioned serial low carbon-structural steel all adopts describing method in document, ingot butt center needle pore defect is not improved.
Publication number is that CN1624182A discloses corrosion-resistive martensitic stainless steel having no pin hole defect and manufacture method thereof, relate to for the manufacture of table knife, cutter, scissors, the highly corrosion resistant martensitic stain less steel of textile industry spinning and braided support and manufacture method thereof, its chemical composition, with % weighing scale, comprise C:0.12% ~ 0.17%, Mn:2.0% or less, P:0.045% or 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 the present invention is mainly used in processing and manufacturing automobile, the low carbon-structural steel of the travelling gears such as wind-driven generator, its chemical composition is different.
Summary of the invention
Needle pore defect problem is there is in order to solve production low carbon-structural steel steel ingot, the object of the present invention is to provide a kind of low carbon-structural steel smelting process preventing steel ingot from occurring needle pore defect, it is qualified that the low carbon-structural steel that the method is produced is detected by ultrasonic examination, meet macrostructure requirement, the cross section acidleach macrostructure test piece of steel is without macroscopic needle pore defect.
Technical solution of the present invention is as follows:
The invention provides a kind of low carbon-structural steel smelting process preventing steel ingot from occurring needle pore defect, comprise the steps: EAF eccentric bottom tapping electric arc furnace smelting → LF external refining → VD stove Fruit storage → die casting cast → breaking down cogging → excellent one rolling → flaw detection, it is characterized in that:
To die casting cast molten steel temperature decreasing value 0.8 ~ 1.3 DEG C/min after VD stove Fruit storage;
In described die casting cast, pouring temperature is 1575 ~ 1585 DEG C;
In described die casting cast, use ingot mould wharve, die casting teeming rate is the ingot body teeming rate of ingot mould is 30 ~ 65kg/s, the cap mouth teeming rate 5 ~ 15kg/s of ingot mould.
According to the low carbon-structural steel smelting process preventing steel ingot from occurring needle pore defect of the present invention, in described die casting is watered, ingot mould wharve is overlapped in application die casting 2.3 ingot shape cast use 3, and arrangement is " 6+7+4 " or " 6+8+4 ", and die casting teeming rate is following table:
According to the low carbon-structural steel smelting process preventing steel ingot from occurring needle pore defect of the present invention, preferably, in described die casting cast, pouring temperature is 1580 ~ 1585 DEG C.
According to the low carbon-structural steel smelting process preventing steel ingot from occurring needle pore defect of the present invention, preferably, described flaw detection comprises surface inspection and center flaw detection.
According to the low carbon-structural steel smelting process preventing steel ingot from occurring needle pore defect of the present invention, preferably, in described LF external refining, adopt two ladle turnover mode, ladle interval time≤720min.
According to the low carbon-structural steel smelting process preventing steel ingot from occurring needle pore defect of the present invention, in described EAF eccentric bottom tapping electric arc furnace smelting:
Arc furnace tapping requires: P:0.005 ~ 0.012% by percentage to the quality, temperature 1640 ~ 1670 DEG C, oxygen activity 600 ~ 1000ppm;
Eccentric bottom tapping, tapping process adds: Al ingot 0.5 ~ 1.0kg/t, SiAl2.5-3.0kg/t, FeSi30-40kg/ stove, lime 200 ~ 300kg/ stove.
According to the low carbon-structural steel smelting process preventing steel ingot from occurring needle pore defect of the present invention, in described LF external refining, deoxidation, make white slag, slag making deoxidation uses SiFe powder, C powder; Use alloy electrolytic manganese, ferrosilicon, medium carbon ferrochrome, adjustment composition;
1 adjustment Al mass percentage content to 0.030 ~ 0.040% analyzed by LF stove;
LF stove is adjusted to 0.004 ~ 0.010% to the degree of S before VD stove bull ladle;
According to the low carbon-structural steel smelting process preventing steel ingot from occurring needle pore defect of the present invention, in described VD stove Fruit storage,
Enter VD stove and feed Al to 0.050 ~ 0.055% by percentage to the quality;
Enter pump time 3 ~ 8min, maintain pressure 66.7Pa time 10 ~ 20min;
After moving back pump, thermometric samples, and add carbonization rice husk in the top of the slag after moving back pump and be evenly added on the top of the slag, addition is 20 ~ 25kg/ stove; In the following order successively: feed Al to 0.010 ~ 0.040%; Feed Si-Ca line: 0.20 ~ 0.25kg/t; Feed S to 0.020 ~ 0.035% by percentage to the quality;
After VD terminates, the weak mixing time 10 ~ 20min of BOTTOM ARGON BLOWING, argon pressure and Flow-rate adjustment are not routed up the top of the slag with molten steel and are as the criterion, within the scope of molten steel temperature decreasing value 0.8 ~ 1.3 DEG C/min;
Liquidus curve: 1511 DEG C; Bull ladle temperature: 1575 ~ 1585 DEG C.
According to the low carbon-structural steel smelting process preventing steel ingot from occurring needle pore defect of the present invention, preferably, in described die casting cast, use argon for protecting pouring, it is that oblique line successively decreases after-teeming step by step that ingot mould ingot body teeming rate switches to cap mouth teeming rate.
Detailed Description Of The Invention: the low carbon-structural steel smelting process preventing steel ingot from occurring needle pore defect of the present invention:
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 is through theory calculate, and the solid-liquid phase line of crossing medium carbon steel, bearing steel is on the low side.Detailed comparisons sees the following form.
Table 2. solid, liquid liquidus temperature presses theoretical formula method
| Solidus temperature (DEG C) | Liquidus temperature (DEG C) | Solidus line temperature gap (DEG C) | Technological temperature (DEG C) | |
| The application's 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 |
Adopt the narrow control technology of die casting pouring temperature, namely after refining furnace process, pouring temperature controls at 1575 ~ 1585 DEG C, and strives pouring temperature being controlled, within the scope of the upper limit-5 DEG C, namely to strive 1580 ~ 1585 DEG C.Above-mentioned low carbon-structural steel solid-liquid phase line scope is less, medium carbon steel or bearing steel pouring temperature is adopted to control, to occur die casting cast after ingot solidification time, solid-liquid phase line temperature range is little, in two-phase section, each crystallization nuclei is grown up with the form of dendritic crystal, interlaced due to dendrite, not solidified molten steel is divided into some little parts, in each several part separated, the crystallization of liquid is shunk and is independently carried out, when ingot solidification be can not get molten steel supplement, hole is formed in steel ingot central area with regard to inevitable, after flaw detection sampling, heart region presents tiny pin hole in the sample.So die casting pouring temperature adopts narrow control technology after refining furnace process.
Reduce the application of vacuum of refining VD stove complete to die casting cast molten steel temperature decreasing value, after application of vacuum, add carbonization rice husk (amounting to 20 ~ 25kg/ stove).Find that carbonization rice husk is covered in the top of the slag and can effectively ensures that the top of the slag does not crust by test, ensure that the application of vacuum of refining VD stove is complete within the scope of die casting cast molten steel temperature decreasing value 0.8 ~ 1.3 DEG C/min, preferably 0.9 ~ 1.0 DEG C/min.
Produce and adopt two ladle turnover mode, forbid to use ladle interval time >=ladle of 720 minutes, guarantee that die casting pouring temperature controls, reduce the impact of ladle liner refractory material heat absorption on molten steel temperature, ensure that the application of vacuum of refining VD stove is complete to die casting cast molten steel temperature decreasing value 0.8 ~ 1.3 DEG C/min.
2, die casting teeming rate controls
Adopt die casting teeming rate control technology.Namely die casting 2.3 ingot shape uses 3 cover ingot mould wharves, and arrangement is " 6+7+4 " or " 6+8+4 " (i.e. die casting time-division 3 pieces of steel ingot chassis layouts, on each piece of steel ingot chassis, ingot mould is arranged and divided 674 or 68 4).Through calculating and field experience summary, die casting teeming rate controls according to the form below operation:
Table 3. die casting teeming rate controls
Note: it is that oblique line successively decreases after-teeming step by step that ingot mould ingot body teeming rate switches to cap mouth teeming rate.
Prevent die casting teeming rate too fast or or slow and directly that rate variation is large, make molten steel in ingot mould occur refunding stream and filling uneven situation, and then produce needle pore defect.
Advantageous Effects of the present invention:
The invention provides a kind of low carbon-structural steel smelting process preventing steel ingot from occurring needle pore defect, it is qualified that the method makes steel be detected by ultrasonic examination, meet macrostructure requirement, the cross section acidleach macrostructure test piece of steel is without macroscopic needle pore defect, and to preventing, low carbon-structural steel ingot needle pore defect is quite obvious.
The narrow control technology of the application's die casting pouring temperature, namely after refining furnace process, pouring temperature controls at 1575 ~ 1585 DEG C, and strives pouring temperature being controlled, within the scope of the upper limit-5 DEG C, namely to strive 1580 ~ 1585 DEG C.After replacing the refining furnace process of former technological requirement, pouring temperature controls at 1565 ~ 1580 DEG C, and pouring temperature controls within the scope of ± 15 DEG C.Effectively prevent low carbon-structural steel solid-liquid phase line scope less, form hole in steel ingot central area, cause the generation of needle pore defect.
The application produces and adopts two ladle turnover mode, forbid to use ladle interval time >=ladle of 720 minutes.Guarantee that die casting pouring temperature controls, reduce the impact of ladle liner refractory material heat absorption on molten steel temperature, ensure that the application of vacuum of refining VD stove is complete within the scope of die casting cast molten steel temperature decreasing value 0.8 ~ 1.3 DEG C/min.
The application adopts die casting teeming rate control technology, replaces 2.3 ingot shape ingot duration of pouring body 3'30 " ~ 4'30 " cap mouth >=2'30 of former technological requirement " the die casting control technology duration of pouring.Prevent die casting teeming rate too fast or or slow and directly that rate variation is large, make molten steel in ingot mould occur refunding stream and filling uneven situation, and then produce needle pore defect.
After employing the application method, smelt this serial low carbon-structural steel result follow-up: within 2013, produce average 92.49% (interim production improvement test in 1 to May intra-company total cross-section flaw detection qualification rate average 88.31%, uses this patent method intra-company total cross-section flaw detection qualification rate average 95.47% 6 to December) of this serial low carbon-structural steel intra-company total cross-section flaw detection qualification rate.The cross section acidleach macrostructure test piece of steel finds no macroscopic needle pore defect.
Accompanying drawing explanation
Fig. 1 implements the macrostructure photo preventing steel ingot from occurring the low carbon-structural steel smelting process gained low carbon-structural steel of needle pore defect provided by the invention, no pin-hole defect;
Fig. 2 is the macrostructure photo not implementing smelting process gained low carbon-structural steel provided by the invention, has needle pore defect.
Detailed description of the invention
In order to understand the present invention better, illustrate content of the present invention further below in conjunction with embodiment, but content of the present invention is not only confined to the following examples.
The method of detection of low carbon-structural steel involved in the present invention and instrument: adopt National Standard of the People's Republic of China's forging rolling rod iron supersonic testing method, standard No. GB/T4162-1991.The method of inspection adopts longitudinal wave reflection method, is the rod iron of 81 to 250mm to diameter, adopts contact method to test, and judges the credit rating of ultrasonic inspection according to regulation in above-mentioned standard.Defect-detecting equipment is GE company ROTA130S ultrasonic testing system.Its index meets following requirement: 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 precision has 12dB ± 1.0dB.
One, implement to adopt smelting process of the present invention and result of detection:
1, EAF technological requirement:
Electric furnace steel tapping requires: [P] 0.005 ~ 0.012%; T (DEG C) 1640 ~ 1670 DEG C, oxygen activity 600 ~ 1000ppm;
Eccentric bottom tapping, tapping process adds: deoxidier Al ingot 0.5 ~ 1.0kg/t, SiAl:2.5-3.0kg/t, FeSi:30-40kg/ stove, lime 200 ~ 300kg/ stove;
2, LF stove technological requirement
Adopt two ladle turnover modes;
LF stove deoxidation work is carried out, and makes white slag, and slag making deoxidation uses with SiFe powder, C powder; Use alloy adjustment composition, electrolytic manganese, ferrosilicon, medium carbon ferrochrome;
LF stove analysis 1 joins [Al] to 0.030 ~ 0.040%;
LF stove is to [S] before VD stove bull ladle to 0.004 ~ 0.010%;
3, VD stove technological requirement
Enter VD and feed Al to 0.050 ~ 0.055%;
Enter the pump time and strive 3 ~ 8min, 66.7Pa time 10 ~ 20min;
After moving back pump, thermometric samples, and adds carbonization rice husk be evenly added on the top of the slag 20 ~ 25kg/ stove after moving back pump in the top of the slag; According to analysis result Composition Control on request; In the following order successively: feed Al to 0.010 ~ 0.040%; Feed Si-Ca line: 0.20 ~ 0.25kg/t; Feed S to 0.020 ~ 0.035%;
After VD terminates, necessary 10 ~ 20 minutes of the weak mixing time of BOTTOM ARGON BLOWING, argon pressure and Flow-rate adjustment are not routed up the top of the slag with molten steel and are as the criterion, within the scope of molten steel temperature decreasing value 0.8 ~ 1.3 DEG C/min;
Liquidus curve: 1511 DEG C; Bull ladle temperature: 1575 ~ 1585 DEG C, and strive pouring temperature being controlled, within the scope of the upper limit-5 DEG C, namely strive 1580 ~ 1585 DEG C.
4, die casting pouring technology
Use argon for protecting pouring;
Cast 2.3t ingot, die casting teeming rate controls according to the form below operation:
Table 4. die casting teeming rate controls
Note: it is that oblique line successively decreases after-teeming step by step that ingot mould ingot body teeming rate switches to cap mouth teeming rate.
Water to finish and add cap mouth exothermic mixture 6 ~ 10kg and often prop up;
5, result of detection sees the following form:
Table 5
Two, former smelting process and result of detection are implemented in contrast:
1, EAF technological requirement:
Electric furnace steel tapping requires: [P] 0.005 ~ 0.012%; T (DEG C) 1640 ~ 1670 DEG C, oxygen activity 600 ~ 1000ppm;
Eccentric bottom tapping, tapping process adds: deoxidier Al ingot 0.5 ~ 1.0kg/t, SiAl:.2.5-3.0kg/t, FeSi:30-40kg/ stove, lime 200 ~ 300kg/ stove;
2, LF stove technological requirement
Adopt three ladle turnover modes;
LF stove deoxidation work is carried out, and makes white slag, and slag making deoxidation uses with SiFe powder, C powder; Use alloy adjustment composition, electrolytic manganese, ferrosilicon, medium carbon ferrochrome;
LF stove analysis 1 joins [Al] to 0.030 ~ 0.040%;
LF stove is to [S] before VD stove bull ladle to 0.004 ~ 0.010%;
3, VD stove technological requirement
Enter VD and feed Al to 0.050 ~ 0.055%;
Enter the pump time and strive 3 ~ 8min, 66.7Pa time 10 ~ 20min;
After moving back pump, thermometric samples, and adds carbonization rice husk be evenly added on the top of the slag 20 ~ 25kg/ stove after moving back pump in the top of the slag; According to analysis result Composition Control on request; In the following order successively: feed Al to 0.010 ~ 0.040%; Feed Si-Ca line: 0.20 ~ 0.25kg/t; Feed S to 0.020 ~ 0.035%;
After VD terminates, necessary 10 ~ 20 minutes of the weak mixing time of BOTTOM ARGON BLOWING, argon pressure and Flow-rate adjustment are not routed up the top of the slag with molten steel and are as the criterion;
Liquidus curve: 1511 DEG C; Bull ladle temperature: 1565 ~ 1580 DEG C.
4, die casting pouring technology
Use argon for protecting pouring;
Cast 2.3t ingot, die casting teeming rate controls by the operation duration of pouring: 2.3 ingot shape ingot duration of pouring body 3'30 " ~ 4'30 " cap mouth >=2'30 " the die casting control technology duration of pouring.
Water to finish and add cap mouth exothermic mixture 6 ~ 10kg and often prop up;
5, result of detection sees the following form:
Table 6
Three, implement the application's method and implement front and back flaw detection qualification rate contrast:
Table 7
| Month | Implement first 2012 | Implement latter 2013 |
| January | 85.24％ | 90.33％ |
| February | 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％ |
| Mean value | 80.66％ | 92.49％ |
Adopt the application provide a kind of prevent steel ingot from occurring the low carbon-structural steel smelting process of needle pore defect after, smelt this serial low carbon-structural steel result follow-up: within 2013, produce average 92.49% (interim production improvement test in 1 to May intra-company total cross-section flaw detection qualification rate average 88.31%, uses this patent method intra-company total cross-section flaw detection qualification rate average 95.47% 6 to December) of this serial low carbon-structural steel intra-company total cross-section flaw detection qualification rate.The cross section acidleach macrostructure test piece of steel finds no macroscopic needle pore defect.
The Performance Detection of the low carbon-structural steel four, involved by the application:
Grain size detects, and adopts National Standard of the People's Republic of China's metal mean grain size assay method, standard No. GB/T6394-2002.Comparison method is adopted to be by contrasting to evaluate mean grain size with standard series judge picture.
1 to June in 2013, grain size mean value was 7.0 grades, and 7 to December in 2013, mean value was 7.0 grades.Patent of the present invention prevents low carbon-structural steel needle pore defect, and properties of product have also been obtained maintenance simultaneously.
Five, the application implements the low carbon-structural steel macrostructure contrast of front and back, sees accompanying drawing 1 and accompanying drawing 2.
Claims (9)
1. the low carbon-structural steel smelting process preventing steel ingot from occurring needle pore defect, comprise the steps: EAF eccentric bottom tapping electric arc furnace smelting → LF external refining → VD stove Fruit storage → die casting cast → breaking down cogging → excellent one rolling → flaw detection, it is characterized in that:
To die casting cast molten steel temperature decreasing value 0.8 ~ 1.3 DEG C/min after VD stove Fruit storage;
In described die casting cast, pouring temperature is 1575 ~ 1585 DEG C;
In described die casting cast, use ingot mould wharve, die casting teeming rate is the ingot body teeming rate of ingot mould is 30 ~ 65kg/s, the cap mouth teeming rate 5 ~ 15kg/s of ingot mould.
2. prevent steel ingot from occurring the low carbon-structural steel smelting process of needle pore defect according to claim 1, it is characterized in that, in described die casting is watered, ingot mould wharve is overlapped in application die casting 2.3 ingot shape cast use 3, arrangement is " 6+7+4 " or " 6+8+4 ", and die casting teeming rate is following table:
。
3. prevent steel ingot from occurring the low carbon-structural steel smelting process of needle pore defect according to claim 1, it is characterized in that, in described die casting cast, pouring temperature is 1580 ~ 1585 DEG C.
4. prevent steel ingot from occurring the low carbon-structural steel smelting process of needle pore defect according to claim 1, it is characterized in that, described flaw detection comprises surface inspection and center flaw detection.
5. prevent steel ingot from occurring the low carbon-structural steel smelting process of needle pore defect according to claim 1, it is characterized in that, in described LF external refining, adopt two ladle turnover mode, ladle interval time≤720min.
6. prevent steel ingot from occurring the low carbon-structural steel smelting process of needle pore defect according to claim 1, it is characterized in that, in described EAF eccentric bottom tapping electric arc furnace smelting:
Arc furnace tapping requires: P:0.005 ~ 0.012% by percentage to the quality, temperature 1640 ~ 1670 DEG C, oxygen activity 600 ~ 1000ppm;
Eccentric bottom tapping, tapping process adds: Al ingot 0.5 ~ 1.0kg/t, SiAl2.5-3.0kg/t, FeSi30-40kg/ stove, lime 200 ~ 300kg/ stove.
7. prevent steel ingot from occurring the low carbon-structural steel smelting process of needle pore defect according to claim 1, it is characterized in that, in described LF external refining, deoxidation, make white slag, adjustment composition;
1 adjustment Al mass percentage content to 0.030 ~ 0.040% analyzed by LF stove;
LF stove is adjusted to 0.004 ~ 0.010% to the degree of S before VD stove bull ladle.
8. prevent steel ingot from occurring the low carbon-structural steel smelting process of needle pore defect according to claim 1, it is characterized in that, in described VD stove Fruit storage,
Enter VD stove and feed Al to 0.050 ~ 0.055% by percentage to the quality;
Enter pump time 3 ~ 8min, maintain pressure 66.7Pa time 10 ~ 20min;
After moving back pump, thermometric samples, and add carbonization rice husk in the top of the slag after moving back pump and be evenly added on the top of the slag, addition is 20 ~ 25kg/ stove; In the following order successively: feed Al to 0.010 ~ 0.040%; Feed Si-Ca line: 0.20 ~ 0.25kg/t; Feed S to 0.020 ~ 0.035% by percentage to the quality;
After VD terminates, the weak mixing time 10 ~ 20min of BOTTOM ARGON BLOWING, argon pressure and Flow-rate adjustment are not routed up the top of the slag with molten steel and are as the criterion, within the scope of molten steel temperature decreasing value 0.8 ~ 1.3 DEG C/min;
Liquidus curve: 1511 DEG C; Bull ladle temperature: 1575 ~ 1585 DEG C.
9. prevent steel ingot from occurring the low carbon-structural steel smelting process of needle pore defect according to claim 1; it is characterized in that; in described die casting cast, use argon for protecting pouring, it is that oblique line successively decreases after-teeming step by step that ingot mould ingot body teeming rate switches to cap mouth teeming rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410217768.4A CN105081295B (en) | 2014-05-21 | 2014-05-21 | A kind of low carbon-structural steel smelting process for preventing steel ingot from needle pore defect occur |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410217768.4A CN105081295B (en) | 2014-05-21 | 2014-05-21 | A kind of low carbon-structural steel smelting process for preventing steel ingot from needle pore defect occur |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105081295A true CN105081295A (en) | 2015-11-25 |
| CN105081295B CN105081295B (en) | 2018-08-03 |
Family
ID=54563138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410217768.4A Expired - Fee Related CN105081295B (en) | 2014-05-21 | 2014-05-21 | A kind of low carbon-structural steel smelting process for preventing steel ingot from needle pore defect occur |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105081295B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106319135A (en) * | 2016-11-24 | 2017-01-11 | 新兴铸管股份有限公司 | Method for preventing C and Mn element composition fluctuation by 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 |
| CN113770316A (en) * | 2021-08-19 | 2021-12-10 | 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 |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1444002A (en) * | 1972-08-05 | 1976-07-28 | Rheinstahl Ag | Casting method and apparatus |
| JPS61276954A (en) * | 1985-05-30 | 1986-12-06 | Daido Steel Co Ltd | Die steel and its manufacture |
| CN1490101A (en) * | 2003-08-26 | 2004-04-21 | 宝钢集团上海五钢有限公司 | Improvement of carbon segregation in moderate carbon structural steel by mould casting |
| 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 |
| CN101450364A (en) * | 2007-12-04 | 2009-06-10 | 石顺 | Method for solving forged steel crankshaft magnetic trace problem |
| 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 |
| CN101722280A (en) * | 2009-12-28 | 2010-06-09 | 舞阳钢铁有限责任公司 | Die casting method and die casting equipment for heavy section crack detection steel grade |
| CN102080182A (en) * | 2010-12-27 | 2011-06-01 | 南阳汉冶特钢有限公司 | High-strength steel plate Q460GJE-Z35 for extra-thick high-rise building structure and production method thereof |
| CN102409232A (en) * | 2011-12-30 | 2012-04-11 | 南阳汉冶特钢有限公司 | Low alloy high strength structural iron Q390C super-thick steel plate and production method thereof |
| WO2012074119A1 (en) * | 2010-12-02 | 2012-06-07 | Sintokogio, Ltd. | Automatic pouring method and apparatus |
| CN102634732A (en) * | 2011-02-15 | 2012-08-15 | 宝山钢铁股份有限公司 | Smelting method of high-carbon chromium bearing steel |
| CN103350202A (en) * | 2013-07-12 | 2013-10-16 | 抚顺特殊钢股份有限公司 | Method for manufacturing high-quality SCr420 HB automobile gear steel |
| CN103725966A (en) * | 2013-12-26 | 2014-04-16 | 南阳汉冶特钢有限公司 | 100-150mm alloy structural steel 4140 thick plate and production technique thereof |
-
2014
- 2014-05-21 CN CN201410217768.4A patent/CN105081295B/en not_active Expired - Fee Related
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1444002A (en) * | 1972-08-05 | 1976-07-28 | Rheinstahl Ag | Casting method and apparatus |
| JPS61276954A (en) * | 1985-05-30 | 1986-12-06 | Daido Steel Co Ltd | Die steel and its manufacture |
| CN1490101A (en) * | 2003-08-26 | 2004-04-21 | 宝钢集团上海五钢有限公司 | Improvement of carbon segregation in moderate carbon structural steel by mould casting |
| CN101450364A (en) * | 2007-12-04 | 2009-06-10 | 石顺 | Method for solving forged steel crankshaft magnetic trace problem |
| 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 |
| CN101722280A (en) * | 2009-12-28 | 2010-06-09 | 舞阳钢铁有限责任公司 | Die casting method and die casting equipment for heavy section crack detection steel grade |
| WO2012074119A1 (en) * | 2010-12-02 | 2012-06-07 | Sintokogio, Ltd. | Automatic pouring method and apparatus |
| CN102080182A (en) * | 2010-12-27 | 2011-06-01 | 南阳汉冶特钢有限公司 | High-strength steel plate Q460GJE-Z35 for extra-thick high-rise building structure and production method thereof |
| CN102634732A (en) * | 2011-02-15 | 2012-08-15 | 宝山钢铁股份有限公司 | Smelting method of high-carbon chromium bearing steel |
| CN102409232A (en) * | 2011-12-30 | 2012-04-11 | 南阳汉冶特钢有限公司 | Low alloy high strength structural iron Q390C super-thick steel plate and production method thereof |
| CN103350202A (en) * | 2013-07-12 | 2013-10-16 | 抚顺特殊钢股份有限公司 | Method for manufacturing high-quality SCr420 HB automobile gear steel |
| CN103725966A (en) * | 2013-12-26 | 2014-04-16 | 南阳汉冶特钢有限公司 | 100-150mm alloy structural steel 4140 thick plate and production technique thereof |
Non-Patent Citations (1)
| Title |
|---|
| 王玉玲等: ""大功率电力机车车轴用EAIN钢的生产工艺实践"", 《特殊钢》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106319135A (en) * | 2016-11-24 | 2017-01-11 | 新兴铸管股份有限公司 | Method for preventing C and Mn element composition fluctuation by smelting process |
| 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 |
| CN113770316A (en) * | 2021-08-19 | 2021-12-10 | 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 |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105081295B (en) | 2018-08-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103320704B (en) | High performance bearing steel and production method thereof | |
| CN104962800B (en) | Smelting method for stainless steel material | |
| CN102268608B (en) | Large capacity high pressure gas cylinder steel and production method thereof | |
| CN103160729A (en) | Medium-carbon microalloyed steel for engineering machinery caterpillar chain piece and production process thereof | |
| CN112981128B (en) | Smelting method of electrode bar base material for non-protective atmosphere electroslag remelting H13 steel | |
| CN105861951A (en) | Manufacturing method of oversized continuous casting slab of nickel stainless steel | |
| CN102277534A (en) | Hot rolled steel section for gas cylinders and production method thereof | |
| CN110423859A (en) | A kind of low-phosphorous smelting process of martensitic stain less steel main shaft | |
| CN101255531A (en) | Production method of low-Ti pinion steel | |
| CN105081295A (en) | Low-carbon structural steel smelting method for preventing pinhole defects appearing in steel ingot | |
| CN107557690B (en) | Low-temperature-resistant and lamellar-tearing-resistant super-thick steel plate and manufacturing method thereof | |
| CN106048139B (en) | The nitrogen flushing alloyage process of 18CrNiMo7-6 steel | |
| CN103131942A (en) | Vermicular graphite cast iron with high percent of vermiculation of combustion motor cylinder body and cylinder cover and preparation method | |
| CN108504935A (en) | Containing V, N Micro Alloying pre-hardened plastic mold steel and preparation method thereof | |
| CN110541115A (en) | Method for manufacturing austenitic stainless steel 150 short-specification continuous casting round pipe blank | |
| CN110484825A (en) | A kind of low cost 355MPa is hot rolled H-shaped and preparation method thereof | |
| CN105177408A (en) | Low-cost hot-rolled thin strip steel containing boron and manufacturing method thereof | |
| CN102277532A (en) | Cold working mold steel Cr8 and production method thereof | |
| CN110093568A (en) | A kind of high strength low yield ratio weathering resistant compartment weathering steel and preparation method thereof | |
| CN108624815A (en) | Containing V, Nb, Ti Micro Alloying pre-hardened plastic mold steel and preparation method thereof | |
| CN108286013A (en) | A kind of cut deal Vessel Steels 15CrMnR steel-making continuous casting production methods | |
| CN110218954A (en) | A kind of preparation method of 4Cr13V plastic die steel | |
| CN110317926A (en) | A method of tapping nitrogen increased amount is reduced using silicon carbide deoxidation | |
| CN107151762B (en) | A kind of smelting continuous casting method of alloy die steel 1.2311 | |
| CN103031488B (en) | Manufacturing method of hot rolled steel and hot rolled steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180803 Termination date: 20210521 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |