CN114273643A - Method for improving percent of pass of large single-weight high-alloy electroslag ingot - Google Patents
Method for improving percent of pass of large single-weight high-alloy electroslag ingot Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 135
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 33
- 239000000956 alloy Substances 0.000 title claims abstract description 33
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 37
- 239000010959 steel Substances 0.000 claims abstract description 37
- 238000010438 heat treatment Methods 0.000 claims abstract description 26
- 238000004321 preservation Methods 0.000 claims abstract description 23
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 229910000599 Cr alloy Inorganic materials 0.000 claims abstract description 13
- 229910001182 Mo alloy Inorganic materials 0.000 claims abstract description 13
- 229910000756 V alloy Inorganic materials 0.000 claims abstract description 13
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- 230000007547 defect Effects 0.000 claims description 19
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- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
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- 229910000851 Alloy steel Inorganic materials 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The invention discloses a method for improving the qualification rate of a large single-weight high-alloy electroslag ingot, belonging to the technical field of ferrous metallurgy. The method comprises the working procedures of demoulding, electroslag remelting, temperature clearing, heating before rolling and rolling; in the demolding step, after the electroslag ingot starts to be demolded, when the temperature of the head is reduced to 400-plus-500 ℃, heat preservation treatment is carried out on the head at the position of 1.2-1.5m by adopting heat preservation cotton, the temperature reduction speed is controlled to be less than or equal to 7 ℃/h, and after the electroslag ingot is integrally demolded, the temperature of the head is 300-plus-350 ℃. The electroslag ingot produced by the method has the single weight of 50-55t, the total amount of Cr, Mo and V alloy is 3.5-4.5%, the flaw detection qualification rate of a steel plate is more than or equal to 97%, the plate shape qualification rate is more than or equal to 99%, and the surface qualification rate is more than or equal to 99%.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a method for improving the qualification rate of a large single-weight high-alloy electroslag ingot.
Background
The large single-weight high-alloy electroslag ingot is mainly applied to producing large-thickness alloy steel plates, the steel plates are often applied to manufacturing petrochemical equipment, and the requirements on the surface and the internal quality of the steel plates are high because the working environment of the petrochemical equipment is extremely harsh and is often a high-temperature, high-pressure and strong-corrosion environment.
The high alloy electroslag ingot has high production cost, which is mainly reflected in high alloy content of the steel ingot and extremely complex steel ingot production process. The high alloy steel plate applied to petrochemical equipment contains more Cr, Mo and V alloys, so that the alloy cost is high; in the production process of the electroslag ingot steel plate, the working procedures of smelting, continuous casting, electrode preparation, electroslag remelting, surface cleaning, rolling and the like are required, the working procedures are very complicated, and the surface or internal defects of the steel ingot are easily caused by deviation in any link in the process, so that the working procedure cost is high.
In the production process of the electroslag ingot finished steel plate, the defects of explosion and surface cracks are easy to generate, mainly because the head of the electroslag ingot is firstly demoulded in the production process, the head temperature drop is easy to cause, the temperature difference between the head and the tail of the steel ingot is large, particularly for an electroslag ingot with the single weight of 50-55t, the remelting time exceeds 30h, the part solidified firstly is exposed in the air for a long time, and the temperature drop control difficulty is large; in addition, the steel ingot has high alloy content, the total amount of Cr, Mo and V alloy reaches 3.5-4.5%, the electroslag ingot can generate larger component segregation in the remelting-solidification process, and further the electroslag ingot has larger internal stress, and the internal stress control difficulty is larger due to the limitation of components and production process, so that the steel plate made of the electroslag ingot is easy to have head explosion and crack defects.
The flaw detection defect of the steel plate made of the electroslag ingot is easy to occur, and the flaw detection defect of the steel plate is improper mainly because the tail of the electroslag ingot is easy to generate a shrinkage cavity defect in the solidification process and the defect can not be pressed in the rolling process. The single weight of the electroslag ingot is large, the broadband reaches more than 2000mm, the thickness reaches more than 900mm, and the alloy content is high, so that feeding is difficult in the solidification process, and the control difficulty of tail shrinkage cavity is large.
Any defect causes unqualified electroslag ingot finished steel plates and great economic loss. In order to reduce the loss of the high alloy electroslag ingot caused by flaw detection and explosion, the invention starts from the production process of the electroslag ingot, innovates the process and improves the qualification rate of the high alloy electroslag ingot.
Disclosure of Invention
The invention aims to solve the technical problem of improving the qualification rate of a large single heavy high alloy electroslag ingot.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a method for improving the qualification rate of large single heavy high alloy electroslag ingots comprises the working procedures of demoulding, electroslag remelting, temperature cleaning, heating before rolling and rolling; in the demolding step, after the electroslag ingot starts to be demolded, when the temperature of the head is reduced to 400-plus-500 ℃, heat preservation treatment is carried out on the head at the position of 1.2-1.5m by adopting heat preservation cotton, the temperature reduction speed is controlled to be less than or equal to 7 ℃/h, and after the electroslag ingot is integrally demolded, the temperature of the head is 300-plus-350 ℃.
The electroslag remelting process adopts a water cooling and air cooling mode, and in the water cooling process, the water quantity of the wide side of the crystallizer is 50-60m3/h, the water quantity of the narrow side is 25-30m3/h, the water inlet temperature is less than or equal to 25 ℃, and the water outlet temperature is less than or equal to 35 ℃.
The electroslag remelting process adopts a water cooling and air cooling mode, an air cooling process, total air volume 3800 and 4000m3/h, smelting is started at 16-18t, and the air volume is decreased by 80-100m3/h every 1 h.
The electroslag remelting process controls the melting speed of 1180-1230 kg/h.
According to the temperature-carrying cleaning process, the defects of the ingot body need to be cleaned by flame before the electroslag ingot is charged, and the cleaning temperature is 230-280 ℃.
In the heating process before rolling, the temperature of the ingot body is more than or equal to 200 ℃ and the temperature of the hearth is 200-300 ℃ when the electroslag ingot is charged into the furnace.
In the heating before rolling process, when the electroslag ingot is heated, the temperature rise speed before 900 ℃ is less than or equal to 40 ℃/h, the temperature is kept at 900 ℃ for 3-5h, then the temperature rise speed is 100-.
The rolling procedure of the invention comprises the steps of hot rolling the steel plate into a finished product, wherein the initial rolling temperature is 1100-.
The electroslag ingot produced by the method has the unit weight of 50-55t and the total amount of Cr, Mo and V alloy is 3.5-4.5%.
The flaw detection qualification rate of the electroslag ingot finished steel plate produced by the method is more than or equal to 97%, the plate shape qualification rate is more than or equal to 99%, and the surface qualification rate is more than or equal to 99%.
According to the method for improving the percent of pass of the large single-weight high-alloy electroslag ingot, after the steel ingot is demoulded, heat preservation treatment is carried out on the head of the steel ingot, so that the temperature drop of the head can be reduced, and the phenomenon of head cracking caused by large temperature difference between the head and the tail is avoided; the melting speed is controlled in the electroslag remelting process, and the water quantity and the air quantity in the cooling process are controlled, so that the internal quality of an electroslag ingot can be improved; the electroslag ingot is cleaned with the temperature, the furnace is charged with the temperature, the temperature difference between the ingot temperature and the hearth is reduced, and the surface defect caused by the contact of the electroslag ingot with the extreme heat environment can be effectively avoided; the heating speed is controlled during heating before electroslag ingot rolling, so that the internal stress generated in the heating process can be reduced, and the cracking phenomenon is avoided.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: 1) the method has the advantages that the single weight of the electroslag ingot is 50-55t, the flaw detection qualification rate of the finished steel plate of the electroslag ingot is more than or equal to 97%, the plate shape qualification rate is more than or equal to 99%, and the surface qualification rate is more than or equal to 99%. 2) The production method only innovates the production process, does not increase the equipment investment, and has lower production cost.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
A method for improving the qualification rate of large single heavy high alloy electroslag ingots comprises the working procedures of demoulding, electroslag remelting, temperature cleaning, heating before rolling and rolling;
(1) a demolding procedure: after the electroslag ingot starts to be demoulded, when the temperature of the head is reduced to 500 ℃, heat preservation treatment is carried out on the position 1.5m away from the head by adopting heat preservation cotton, the temperature reduction speed is 7 ℃/h, and after the electroslag ingot is integrally demoulded, the temperature of the head is 300 ℃;
(2) an electroslag remelting process: a water cooling and air cooling mode is adopted, and the water quantity of the wide side of the crystallizer is 60m in the water cooling process3H, narrow side 30m3H, the water inlet temperature is 25 ℃, and the water outlet temperature is 35 ℃; air cooling process with total air volume of 4000m3H, 18t of smelting is started, and the air quantity is decreased by 100m every 1h3H; controlling the melting speed to 1230 kg/h;
(3) a temperature clearing process: before charging an electroslag ingot into a furnace, carrying out flame cleaning on defects of an ingot body, wherein the cleaning temperature is 280 ℃;
(4) heating procedure before rolling: when the electroslag ingot is charged, the temperature of an ingot body is 200 ℃, and the temperature of a hearth is 300 ℃; when the electroslag ingot is heated, the temperature rise speed is 40 ℃/h before 900 ℃, the temperature is kept for 5h at 900 ℃, and then the temperature rise speed is 150 ℃/h, and the temperature rises to 1260 ℃;
(5) a rolling procedure: the steel plate is hot rolled into a finished product, the initial rolling temperature is 1100 ℃, and the final rolling temperature is 950 ℃.
The electroslag ingot produced by the method has the unit weight of 50t and the total amount of Cr, Mo and V alloy is 4.5 percent. The flaw detection qualification rate of the electroslag ingot finished steel plate is 97%, the plate shape qualification rate is 99%, and the surface qualification rate is 99%.
Example 2
A method for improving the qualification rate of large single heavy high alloy electroslag ingots comprises the working procedures of demoulding, electroslag remelting, temperature cleaning, heating before rolling and rolling;
(1) a demolding procedure: after the electroslag ingot starts to be demoulded, when the temperature of the head is reduced to 400 ℃, heat preservation treatment is carried out on the position 1.2m away from the head by adopting heat preservation cotton, the temperature reduction speed is 5 ℃/h, and after the electroslag ingot is integrally demoulded, the temperature of the head is 350 ℃;
(2) an electroslag remelting process: adopting a water cooling and air cooling mode, wherein the water amount of the wide side of the crystallizer is 50m in the water cooling process3H, narrow side 25m3H, the water inlet temperature is 22 ℃, and the water outlet temperature is 34 ℃; air cooling process with total air volume of 3800m3H, starting smelting at 16t, and gradually reducing the air quantity by 80m every 1h3H; controlling the melting speed to 1180 kg/h;
(3) a temperature clearing process: before charging an electroslag ingot into a furnace, carrying out flame cleaning on defects of the ingot body, wherein the cleaning temperature is 230 ℃;
(4) heating procedure before rolling: when the electroslag ingot is charged, the temperature of an ingot body is 240 ℃, and the temperature of a hearth is 200 ℃; when the electroslag ingot is heated, the temperature rise speed is 38 ℃/h before 900 ℃, the temperature is kept for 3h at 900 ℃, and then the temperature rise speed is 100 ℃/h, and the temperature rises to 1240 ℃;
(5) a rolling procedure: the steel plate is hot rolled into a finished product, the initial rolling temperature is 1150 ℃, and the final rolling temperature is 980 ℃.
The single weight of the electroslag ingot produced by the method is 55t, and the total amount of Cr, Mo and V alloy is 3.5 percent; the flaw detection qualification rate of the electroslag ingot finished steel plate is 98 percent, the plate shape qualification rate is 99.3 percent, and the surface qualification rate is 99.1 percent.
Example 3
A method for improving the qualification rate of large single heavy high alloy electroslag ingots comprises the working procedures of demoulding, electroslag remelting, temperature cleaning, heating before rolling and rolling;
(1) a demolding procedure: after the electroslag ingot starts to be demoulded, when the temperature of the head is reduced to 450 ℃, heat preservation treatment is carried out on the position 1.3m away from the head by adopting heat preservation cotton, the temperature reduction speed is 3 ℃/h, and after the electroslag ingot is integrally demoulded, the temperature of the head is 320 ℃;
(2) an electroslag remelting process: adopting a water cooling and air cooling mode, wherein in the water cooling process, the water quantity of the wide side of the crystallizer is 57m3H, narrow side 29m3H, the water inlet temperature is 24 ℃, and the water outlet temperature is 33 ℃; air cooling process with total air volume of 3810m3H, starting 17t of smelting, and blowing every 1hVolume decreases by 89m3H; controlling the melting speed to 1188 kg/h;
(3) a temperature clearing process: before charging an electroslag ingot into a furnace, carrying out flame cleaning on defects of an ingot body, wherein the cleaning temperature is 234 ℃;
(4) heating procedure before rolling: when the electroslag ingot is charged, the temperature of an ingot body is 202 ℃, and the temperature of a hearth is 278 ℃; when the electroslag ingot is heated, the temperature rise speed is 34 ℃/h before 900 ℃, the temperature is kept for 4h at 900 ℃, and then the temperature rise speed is 133 ℃/h, and the temperature rises to 1256 ℃;
(5) a rolling procedure: the steel plate is hot rolled into a finished product, the initial rolling temperature is 1130 ℃, and the final rolling temperature is 964 ℃.
The weight of the electroslag ingot produced by the method is 52t, and the total amount of Cr, Mo and V alloy is 3.8%; the flaw detection qualification rate of the electroslag ingot finished steel plate is 97.9 percent, the plate shape qualification rate is 99.6 percent, and the surface qualification rate is 99 percent.
Example 4
A method for improving the qualification rate of large single heavy high alloy electroslag ingots comprises the working procedures of demoulding, electroslag remelting, temperature cleaning, heating before rolling and rolling;
(1) a demolding procedure: after the electroslag ingot starts to be demoulded, when the temperature of the head is reduced to 487 ℃, heat preservation treatment is carried out on the head at 1.4m by adopting heat preservation cotton, the temperature reduction speed is 6 ℃/h, and after the electroslag ingot is integrally demoulded, the temperature of the head is 348 ℃;
(2) an electroslag remelting process: adopting a water cooling and air cooling mode, wherein the water quantity of the wide side of the crystallizer is 59m in the water cooling process3H, narrow side 27m3H, the water inlet temperature is 23 ℃, and the water outlet temperature is 32 ℃; air cooling process with total air volume of 3970m3H, starting 17t of smelting, and gradually reducing the air volume by 91m every 1h3H; controlling the melting speed to be 1205 kg/h;
(3) a temperature clearing process: before charging an electroslag ingot into a furnace, carrying out flame cleaning on defects of an ingot body, wherein the cleaning temperature is 257 ℃;
(4) heating procedure before rolling: when the electroslag ingot is charged, the temperature of an ingot body is 214 ℃, and the temperature of a hearth is 247 ℃; when the electroslag ingot is heated, the temperature rise speed is 34 ℃/h before 900 ℃, the temperature is kept at 900 ℃ for 4.2h, then the temperature rise speed is 115 ℃/h, and the temperature rises to 1247 ℃;
(5) a rolling procedure: the steel plate is hot rolled into a finished product, the initial rolling temperature is 1140 ℃, and the final rolling temperature is 977 ℃.
The weight of the electroslag ingot produced by the method is 51t, and the total amount of Cr, Mo and V alloy is 4.2%; the flaw detection qualification rate of the electroslag ingot finished steel plate is 99 percent, the plate shape qualification rate is 99.3 percent, and the surface qualification rate is 99.4 percent.
Example 5
A method for improving the qualification rate of large single heavy high alloy electroslag ingots comprises the working procedures of demoulding, electroslag remelting, temperature cleaning, heating before rolling and rolling;
(1) a demolding procedure: after the electroslag ingot starts to be demoulded, when the temperature of the head is reduced to 470 ℃, heat preservation treatment is carried out on the position 1.5m away from the head by adopting heat preservation cotton, the temperature reduction speed is 3 ℃/h, and after the electroslag ingot is integrally demoulded, the temperature of the head is 317 ℃;
(2) an electroslag remelting process: a water cooling and air cooling mode is adopted, and the water amount of the wide side of the crystallizer is 52m in the water cooling process3H, narrow side 27m3H, the water inlet temperature is 24 ℃, and the water outlet temperature is 31 ℃; air cooling process with total air volume of 3910m3H, starting 17t of smelting, and gradually reducing the air volume by 98m every 1h3H; controlling the melting speed to be 1204 kg/h;
(3) a temperature clearing process: before charging an electroslag ingot into a furnace, the defects of the ingot body need to be cleaned by flame, and the cleaning temperature is 278 ℃;
(4) heating procedure before rolling: when the electroslag ingot is charged, the temperature of an ingot body is 215 ℃, and the temperature of a hearth is 287 ℃; when the electroslag ingot is heated, the temperature rise speed is 34 ℃/h before 900 ℃, the temperature is kept for 3.9h at 900 ℃, and then the temperature rise speed is 131 ℃/h, and the temperature rises to 1257 ℃;
(5) a rolling procedure: the steel plate is hot rolled into a finished product, the initial rolling temperature is 1120 ℃, and the final rolling temperature is 956 ℃.
The weight of the electroslag ingot produced by the method is 54t, and the total amount of Cr, Mo and V alloy is 4.1%; the flaw detection qualification rate of the electroslag ingot finished steel plate is 99 percent, the plate shape qualification rate is 99.9 percent, and the surface qualification rate is 99.3 percent.
Example 6
A method for improving the qualification rate of large single heavy high alloy electroslag ingots comprises the working procedures of demoulding, electroslag remelting, temperature cleaning, heating before rolling and rolling;
(1) a demolding procedure: after the electroslag ingot starts to be demoulded, when the temperature of the head is reduced to 414 ℃, heat preservation treatment is carried out on the position 1.3m away from the head by adopting heat preservation cotton, the temperature reduction speed is 4 ℃/h, and after the electroslag ingot is integrally demoulded, the temperature of the head is 341 ℃;
(2) an electroslag remelting process: adopting a water cooling and air cooling mode, wherein the water amount of the wide side of the crystallizer is 53m in the water cooling process3H, narrow side 26m3H, the water inlet temperature is 22 ℃, and the water outlet temperature is 34 ℃; air cooling process with total air volume of 3970m3H, starting smelting at 17.6t, and gradually reducing the air volume by 92m every 1h3H; controlling the melting speed to 1199 kg/h;
(3) a temperature clearing process: before charging an electroslag ingot into a furnace, carrying out flame cleaning on defects of an ingot body, wherein the cleaning temperature is 247 ℃;
(4) heating procedure before rolling: when the electroslag ingot is charged, the temperature of an ingot body is 207 ℃, and the temperature of a hearth is 257 ℃; when the electroslag ingot is heated, the temperature rise speed is 31 ℃/h before 900 ℃, the temperature is kept for 4.1h at 900 ℃, and then the temperature rise speed is 117 ℃/h, and the temperature rises to 1258 ℃;
(5) a rolling procedure: the steel plate is hot rolled into a finished product, the initial rolling temperature is 1141 ℃, and the final rolling temperature is 959 ℃.
The weight of the electroslag ingot produced by the method is 51t, and the total amount of Cr, Mo and V alloy is 3.8%; the flaw detection qualification rate of the electroslag ingot finished steel plate is 97%, the plate shape qualification rate is 99.3%, and the surface qualification rate is 99.6%.
Example 7
A method for improving the qualification rate of large single heavy high alloy electroslag ingots comprises the working procedures of demoulding, electroslag remelting, temperature cleaning, heating before rolling and rolling;
(1) a demolding procedure: after the electroslag ingot starts to be demoulded, when the temperature of the head is reduced to 474 ℃, heat preservation treatment is carried out on the 1.4m position of the head by adopting heat preservation cotton, the temperature reduction speed is 4 ℃/h, and after the electroslag ingot is integrally demoulded, the temperature of the head is 317 ℃;
(2) an electroslag remelting process: adopting a water cooling and air cooling mode, wherein in the water cooling process, the water quantity of the wide side of the crystallizer is 57m3H, narrow side 27m3H, the water inlet temperature is 24 ℃, and the water outlet temperature is 31 ℃; air cooling process with total air volume of 3810m3H, starting smelting at 16.7t, and gradually reducing the air volume by 88m every 1h3H; controlling the melting speed of 1208 kg/h;
(3) a temperature clearing process: before charging an electroslag ingot into a furnace, carrying out flame cleaning on defects of an ingot body, wherein the cleaning temperature is 254 ℃;
(4) heating procedure before rolling: the temperature of an ingot body is 218 ℃ and the temperature of a hearth is 278 ℃ when the electroslag ingot is charged into a furnace; when the electroslag ingot is heated, the temperature rise speed is 38 ℃/h before 900 ℃, the temperature is kept for 3.3h at 900 ℃, and then the temperature rise speed is 141 ℃/h, and the temperature rises to 1241 ℃;
(5) a rolling procedure: the steel plate is hot rolled into a finished product, the initial rolling temperature is 1109 ℃, and the final rolling temperature is 956 ℃.
The single weight of the electroslag ingot produced by the method is 53t, and the total amount of Cr, Mo and V alloy is 4.2%; the flaw detection qualification rate of the electroslag ingot finished steel plate is 99 percent, the plate shape qualification rate is 99.3 percent, and the surface qualification rate is 99.1 percent.
Example 8
A method for improving the qualification rate of large single heavy high alloy electroslag ingots comprises the working procedures of demoulding, electroslag remelting, temperature cleaning, heating before rolling and rolling;
(1) a demolding procedure: after the electroslag ingot starts to be demoulded, when the temperature of the head is reduced to 441 ℃, heat preservation treatment is carried out on the position 1.2m away from the head by adopting heat preservation cotton, and after the electroslag ingot is integrally demoulded, the temperature of the head is 344 ℃;
(2) an electroslag remelting process: adopting a water cooling and air cooling mode, wherein the water amount of the wide side of the crystallizer is 53m in the water cooling process3H, narrow side 29m3H, the water inlet temperature is 21 ℃, and the water outlet temperature is 32 ℃; air cooling process with total air volume of 3940m3H, starting smelting at 17.9t, and gradually reducing the air volume by 92m every 1h3H; controlling the melting speed to be 1204 kg/h;
(3) a temperature clearing process: before charging an electroslag ingot into a furnace, the defects of the ingot body need to be cleaned by flame, and the cleaning temperature is 266 ℃;
(4) heating procedure before rolling: when the electroslag ingot is charged, the temperature of an ingot body is 241 ℃, and the temperature of a hearth is 251 ℃; when the electroslag ingot is heated, the temperature rise speed is 33 ℃/h before 900 ℃, the temperature is preserved for 3.4h at 900 ℃, and then the temperature rise speed is 137 ℃/h, and the temperature rises to 1257 ℃;
(5) a rolling procedure: the steel plate is hot rolled into a finished product, the initial rolling temperature is 1133 ℃, and the final rolling temperature is 953 ℃.
The weight of the electroslag ingot produced by the method is 51t, and the total amount of Cr, Mo and V alloy is 3.6%; the flaw detection qualification rate of the electroslag ingot finished steel plate is 98 percent, the plate shape qualification rate is 99.3 percent, and the surface qualification rate is 99.1 percent.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (10)
1. A method for improving the qualification rate of large single heavy high alloy electroslag ingots is characterized by comprising the following steps: the method comprises the working procedures of demoulding, electroslag remelting, temperature clearing, heating before rolling and rolling; in the demolding step, after the electroslag ingot starts to be demolded, when the temperature of the head is reduced to 400-plus-500 ℃, heat preservation treatment is carried out on the head at the position of 1.2-1.5m by adopting heat preservation cotton, the temperature reduction speed is controlled to be less than or equal to 7 ℃/h, and after the electroslag ingot is integrally demolded, the temperature of the head is 300-plus-350 ℃.
2. The method for improving the qualification rate of the large single heavy high alloy electroslag ingot according to claim 1, which is characterized in that: the electroslag remelting process adopts a water cooling and air cooling mode, and the water quantity of the wide side of the crystallizer is 50-60m in the water cooling process3H, narrow side 25-30m3The water inlet temperature is less than or equal to 25 ℃, and the water outlet temperature is less than or equal to 35 ℃.
3. The method for improving the qualification rate of the large single heavy high alloy electroslag ingot according to claim 1, which is characterized in that: the electroslag remelting process adopts a water cooling and air cooling mode, an air cooling process and a total air quantity of 3800-4000m3The air quantity is decreased by 80-100m every 1h when smelting is started at 16-18t3/h。
4. The method for improving the qualification rate of the large single heavy high alloy electroslag ingot according to claim 1, which is characterized in that: in the electroslag remelting process, the melting speed is controlled to be 1180-1230 kg/h.
5. The method for improving the qualification rate of the large single heavy high alloy electroslag ingot according to claim 1, which is characterized in that: in the process of cleaning with temperature, the defects of the ingot body need to be cleaned by flame before the electroslag ingot is charged into the furnace, and the cleaning temperature is 230-.
6. The method for improving the qualification rate of the large single heavy high alloy electroslag ingot according to any one of claims 1 to 5, wherein the method comprises the following steps: in the heating process before rolling, the temperature of the ingot body is more than or equal to 200 ℃ when the electroslag ingot is charged into a furnace, and the temperature of a hearth is 200-300 ℃.
7. The method for improving the qualification rate of the large single heavy high alloy electroslag ingot according to any one of claims 1 to 5, wherein the method comprises the following steps: in the heating process before rolling, when the electroslag ingot is heated, the temperature rise speed before 900 ℃ is less than or equal to 40 ℃/h, the temperature is kept at 900 ℃ for 3-5h, then the temperature rise speed is 100-.
8. The method for improving the qualification rate of the large single heavy high alloy electroslag ingot according to any one of claims 1 to 5, wherein the method comprises the following steps: the rolling procedure comprises the steps of hot rolling the steel plate into a finished product, wherein the rolling temperature is 1100-.
9. The method for improving the qualification rate of the large single heavy high alloy electroslag ingot according to any one of claims 1 to 5, wherein the method comprises the following steps: the electroslag ingot produced by the method has the unit weight of 50-55t and the total amount of Cr, Mo and V alloy is 3.5-4.5%.
10. The method for improving the qualification rate of the large single heavy high alloy electroslag ingot according to any one of claims 1 to 5, wherein the method comprises the following steps: the flaw detection qualification rate of the electroslag ingot finished steel plate produced by the method is more than or equal to 97%, the plate shape qualification rate is more than or equal to 99%, and the surface qualification rate is more than or equal to 99%.
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| GB1263014A (en) * | 1969-09-18 | 1972-02-09 | Boehler & Co Ag Geb | Method and devices for the electro-slag remelting of metals, and more particularly of steels |
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| CN107262685A (en) * | 2017-05-23 | 2017-10-20 | 舞阳钢铁有限责任公司 | 50t is with the die casting method of higher level's Large Flat steel ingot |
| CN107267848A (en) * | 2017-05-26 | 2017-10-20 | 舞阳钢铁有限责任公司 | One kind reduces that electroslag becomes a useful person Cr Mo steel crackles and edge bursts method |
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