CN106947914B - A kind of steel ingot of forging pipe die - Google Patents
A kind of steel ingot of forging pipe die Download PDFInfo
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- CN106947914B CN106947914B CN201710363404.0A CN201710363404A CN106947914B CN 106947914 B CN106947914 B CN 106947914B CN 201710363404 A CN201710363404 A CN 201710363404A CN 106947914 B CN106947914 B CN 106947914B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention relates to steel ingot production field, more specifically a kind of forging pipe die steel ingot and its production method, 2 ~ 5% present invention that the riser accounts for steel ingot total weight forge pipe die lumber recovery raising 5 ~ 8%, 500 yuan of ton forging cost reduction by controlling process conditions;Pouring temperature is reduced to 1535 ~ 1545 DEG C by 1560 ~ 1565 DEG C;The duration of pouring is reduced simultaneously, Segregation of Chemical Composition reduces, and C deviations are reduced to ± 0.02 from ± 0.04;Riser accounts for the 2 ~ 5% of steel ingot total weight, has saved material, further improves lumber recovery;Gas content is as follows:TO≤20ppm, H≤1.0ppm, N≤60ppm are substantially reduced than originally.
Description
Technical field
The present invention relates to steel ingot production field, more specifically a kind of forging pipe die steel ingot and its production method.
Background technology
The ingot cast can be made to have since misoperation or note speed, casting temperature control system are improper during ingot casting in steel ingot production
Many disadvantages.Common defect is:The scabbing of surface of steel ingot, pipe and longitudinal and transverse crackle, internal Residual hole, rimhole,
Loose and segregation is mingled with caused by the refractory material and clinker that are mixed into steel, dust.These defects can substantially reduce steel ingot at
Base rate, or even entire steel ingot is made to scrap, in order to mitigate drawbacks described above, shrinkage cavity and porosity, exhaust sum aggregate are prevented in ingot steel casting
The effect of slag, riser typically constitute from, and forge the steel ingot of pipe die, and center needs to be punched out, therefore the center of steel ingot
Quality does not influence the quality of pipe die, therefore riser causes a large amount of waste.
Invention content
The goal of the invention of the present invention be aiming at the deficiencies in the prior art, provide a kind of forging pipe die steel ingot and
Its production method.
The present invention is achieved by the following technical solutions:
A kind of forging pipe die steel ingot, the riser account for the 2 ~ 5% of steel ingot total weight.
The weight of above-mentioned Ingot Type is 30-40t.
The main chemical compositions of above-mentioned steel ingot are by weight percent:C 0.16-0.22%、Si 0.25-0.37%、Mn
0.25-0.35%、P≤0.008 %、S≤0.006、Cr 2.35-2.55%、Ni 0.32-0.45%、Cu≤0.10、Mo 0.32-
0.38%, [H]≤1.2PPM.
A kind of production method of above-mentioned forging pipe die steel ingot, it is characterised in that:Include the following steps:Raw material preparation,
EBT smeltings, LF refining, VD degassings, molding casting, hot sending forging.
Further, above-mentioned EBT smeltings include the following steps:
(1.1)It feeds, is powered, furnace bottom lime 1000kg by dispensing;
(1.2)Molten steel of melting bath temperature reaches 1560 DEG C, and fine melt analysis, decarburized amount is controlled in 0.40% or more, decarbonization rate control
System is the 3% of Metal Weight in 0.02 ~ 0.03%/min, the control quantity of slag;
(1.3)Oxygen end, >=0.03%, the control of [P] desired value exists the control of terminal [C] desired value:≤ 0.004%, tapping temperature
Degree control exists:≥1640℃;
(1.4)Tap:EBT tappings forbid slag, ensure that 10% stays steel amount;
(1.5)Ladle deoxidation agent and slag charge addition:Deoxidier Al 1.5Kg/t, lime 15Kg/t;
(1.6)Tapping material addition sequence:Deoxidier, ferroalloy 20kg/t, slag charge.
Optimization, above-mentioned LF refining includes the following steps:
(2.1)Buggy ladle is opened to LF stove heat stations, and Ar 0.2 ~ 0.4MPa of atmospheric pressure are adjusted, and slugging is even after energization, respectively
SiC powder, Si, Al powder of 0.5 ~ 0.8kg/t is added;
(2.2)Slag condition is adjusted, slag color turns white, recovery time >=18 minute, temperature >=1590 DEG C sampling analysis;
(2.3)White slag is kept for >=25 minutes, keeps furnace reduction atmosphere;Deoxidier 2.0kg/t is added, adjustment temperature is extremely
1620~1630℃;
(2.4)Adjust chemical analysis:Match added elements by tripod special steel chemical composition standard, adds ferroalloy 0.5kg/t or increasing
Carbon agent 0.1kg/t, it is necessary to >=8 minutes could sampling analysis;
(2.5)Go out first 5 minutes adjustment basicity of slags of packet to 2.5 ~ 3.0;Chemical analysis carries out after fully entering composition specification
Bull ladle;
(2.6)Bull ladle feeds Al lines into the stokeholds VD:3 meters/t, 2.5 meters/t of Ca Si wire feeding and increase 0.03% Si;
Optimization, above-mentioned VD furnace technologies include the following steps:
(3.1)Check that VD furnace apparatus, vapor (steam) temperature are more than 170 DEG C, steam pressure is more than 0.8MPa;
(3.2)Vacuum into pump time≤8 minute, vacuum degree 66.7Pa, time >=18 minute, Ar pressure 1.5-2.5Kg;
(3.3)Vacuum finishes, sampling analysis;
(3.4)Vacuum finishes to bull ladle, quiet to blow the Ar times 10-20 minutes, adjustment Ar atmospheric pressures to 0.15 ~ 0.25MPa, molten steel
Do not rout up the top of the slag;
(3.5)Bull ladle pouring temperature:1535℃-1545℃;
Further, above-mentioned pouring technology includes the following steps:
(4.1)Using argon for protecting pouring, 1535 ~ 1545 DEG C of pouring temperature;
(4.2)The 35t steel ingot ingot body durations of pouring: 19~21min;The riser gating time: 3~5min;
(4.3)Annealing process:Pour hot charging after finishing 12h, 80 ~ 100 DEG C/h of heating rate, 760 DEG C of holding temperature, when heat preservation
Between 30h, cooling rate≤30 DEG C/h, tapping temperature≤150 DEG C;
(4.4)With low carbon protective slag, fixed carbon 3 ~ 5%.
The beneficial effects of the invention are as follows:
Pipe die lumber recovery raising 5 ~ 8%, 500 yuan of ton forging cost reduction are forged by controlling process conditions;
Pouring temperature is reduced to 1535 ~ 1545 DEG C by 1560 ~ 1565 DEG C;The duration of pouring is reduced simultaneously, Segregation of Chemical Composition
Reduce, C deviations are reduced to ± 0.02 from ± 0.04;
Riser accounts for the 2 ~ 5% of steel ingot total weight, has saved material, further improves lumber recovery;
Gas content is as follows:TO≤20ppm, H≤1.0ppm, N≤60ppm are substantially reduced than originally.
Specific implementation mode
With reference to specific embodiment, the present invention will be further described, so that those skilled in the art can be better
The solution present invention, but be not intended to limit the present invention.
Embodiment 1
Produce 35t21CrMo10 steel ingots
Chemical composition is by weight percent:C 0.16-0.22%、Si 0.25-0.37%、Mn 0.25-0.35%、P≤
0.008 %, S≤0.006, Cr 2.35-2.55%, Ni 0.32-0.45%, Cu≤0.10, Mo 0.32-0.38%, [H]≤
1.2PPM。
(1.1)It feeds, is powered, furnace bottom lime 1000kg by dispensing;
(1.2)Molten steel of melting bath temperature reaches 1560 DEG C, and fine melt analysis, decarburized amount is controlled in 0.40% or more and decarbonization rate
Control is the 3% of Metal Weight in 0.02 ~ 0.03%/min, the control quantity of slag;
(1.3)Oxygen end, >=0.03%, the control of [P] desired value exists the control of terminal [C] desired value:≤ 0.004%, tapping temperature
Degree control exists:≥1640℃;
(1.4)Tap:EBT tappings forbid slag, ensure that 10% stays steel amount;
(1.5)Ladle deoxidation agent and slag charge addition:Deoxidier Al 1.5Kg/t, lime 15Kg/t;
(1.6)Tapping material addition sequence:Deoxidier, ferroalloy 20kg/t, slag charge.
Treated component content
C 0.08-0.18%、Si 0.17-0.28%、Mn 0.2-0.3%、P≤0.008、Cr 2.20-2.40%、Ni
0.28-0.35%、Mo 0.28-0.34%。
LF refining includes the following steps:
(2.1)Buggy ladle is opened to LF stove heat stations, and Ar 0.2 ~ 0.4MPa of atmospheric pressure are adjusted, and slugging is even after energization, respectively
SiC powder, Si, Al powder of 0.5 ~ 0.8kg/t is added;
(2.2)Slag condition is adjusted, slag color turns white, recovery time >=18 minute, temperature >=1590 DEG C sampling analysis;
(2.3)White slag is kept for >=25 minutes, keeps furnace reduction atmosphere;Deoxidier 2.0kg/t can be added, adjustment temperature is extremely
1620~1630℃;
(2.4)Adjust chemical analysis:Match added elements by tripod special steel chemical composition standard, adds ferroalloy or carburant(Add
Enter amount)Necessary >=8 minutes could sampling analysis;
(2.5)Go out first 5 minutes adjustment basicity of slags of packet to 2.5 ~ 3.0;Chemical analysis carries out after fully entering composition specification
Bull ladle;
(2.6)Bull ladle feeds Al lines into the stokeholds VD:3 meters/t, 2.5 meters/t of Ca Si wire feeding (increases Si 0.03%);
VD furnace technologies include the following steps:
(3.1)Check that VD furnace apparatus, vapor (steam) temperature are more than 170 DEG C, steam pressure is more than 0.8MPa;
(3.2)Vacuum into pump time≤8 minute, vacuum degree 66.7Pa, time >=18 minute, Ar pressure 1.5-2.5Kg;
(3.3)Vacuum finishes, sampling analysis, and fixed [H], fixed [O] are required according to steel grade or ingot shape;
(3.4)Vacuum finishes to bull ladle, quiet to blow the Ar times 10-20 minutes, adjustment Ar atmospheric pressures to 0.15 ~ 0.25MPa, molten steel
Do not rout up the top of the slag;
(3.5)Bull ladle pouring temperature:1535℃-1545℃;
Pouring technology includes the following steps:
(4.1)Using argon for protecting pouring, 1535 ~ 1545 DEG C of pouring temperature;
(4.2)The steel ingot ingot body duration of pouring:For 19 ~ 21min;3 ~ 5min of riser gating time
(4.3)Annealing is executed by former technique;
(4.4)With low carbon protective slag, fixed carbon 3 ~ 5%.
Claims (1)
1. a kind of forging pipe die steel ingot, it is characterised in that:Riser accounts for the 2 ~ 5% of steel ingot total weight;
The weight of above-mentioned Ingot Type is 30-40t;
A kind of above-mentioned forging pipe die steel ingot, main chemical compositions are by weight percent:C 0.16-0.22%、Si 0.25-
0.37%、Mn 0.25-0.35%、P≤0.008 %、S≤0.006%、Cr 2.35-2.55%、Ni 0.32-0.45%、Cu≤
0.10%, Mo 0.32-0.38%, [H]≤1.2ppm, remaining is iron and inevitable impurity;
A kind of production method of above-mentioned forging pipe die steel ingot, includes the following steps:Raw material preparation, EBT smeltings, LF refining,
VD degassings, molding casting, hot sending forging;
The EBT smeltings include the following steps:
(1.1)It feeds, is powered, furnace bottom lime 1000kg by dispensing;
(1.2)Molten steel of melting bath temperature reaches 1560 DEG C, and fine melt analysis, decarburized amount control exists in the control of 0.40% or more, decarbonization rate
0.02 ~ 0.03%/min, the control quantity of slag are the 3% of Metal Weight;
(1.3)Oxygen end, >=0.03%, the control of [P] desired value exists the control of terminal [C] desired value:≤ 0.004%, tapping temperature control
System exists:d≥1640℃;
(1.4)Tap:EBT tappings forbid slag, ensure that 10% stays steel amount;
(1.5)Ladle deoxidation agent and slag charge addition:Deoxidier Al 1.5kg/t, lime 15kg/t;
(1.6)Tapping material addition sequence:Deoxidier, ferroalloy 20kg/t, slag charge;
The LF refining includes the following steps:
(2.1)Buggy ladle is opened to LF stove heat stations, and Ar 0.2 ~ 0.4MPa of atmospheric pressure are adjusted, and slugging is uniform after energization, is added respectively
Enter SiC powder, Si, Al powder of 0.5 ~ 0.8kg/t;
(2.2)Slag condition is adjusted, slag color turns white, recovery time >=18 minute, temperature >=1590 DEG C sampling analysis;
(2.3)White slag is kept for >=25 minutes, keeps furnace reduction atmosphere;Addition deoxidier 2.0kg/t, adjustment temperature to 1620 ~
1630℃;
(2.4)Adjust chemical analysis:By C 0.16-0.22%, Si 0.25-0.37%, Mn 0.25-0.35%, P≤0.008 %, S
≤ 0.006%, Cr 2.35-2.55%, Ni 0.32-0.45%, Cu≤0.10%, Mo 0.32-0.38%, [H]≤1.2ppm,
Yu Weitie and inevitable impurity match added elements, add ferroalloy 0.5kg/t or carburant 0.1kg/t, it is necessary to >=8 minutes ability
Sampling analysis;
(2.5)Go out first 5 minutes adjustment basicity of slags of packet to 2.5 ~ 3.0;Chemical analysis carries out bull ladle after fully entering composition specification;
(2.6)Bull ladle feeds Al lines into the stokeholds VD:3 meters/t, 2.5 meters/t of Ca Si wire feeding and increase 0.03% Si;
The molding casting technique includes the following steps:
(4.1)Using argon for protecting pouring, 1535 ~ 1545 DEG C of pouring temperature;
(4.2)The 35t steel ingot ingot body durations of pouring: 19~21min;The riser gating time: 3~5min;
(4.3)Annealing process:Pour hot charging after finishing 12h, 80 ~ 100 DEG C/h of heating rate, 760 DEG C of holding temperature, soaking time
30h, cooling rate≤30 DEG C/h, tapping temperature≤150 DEG C;
(4.4)With low carbon protective slag, fixed carbon 3 ~ 5%.
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CN103667953A (en) * | 2013-11-28 | 2014-03-26 | 江苏亚星锚链股份有限公司 | Oceanic mooring chain steel with low environmental crack sensitivity and ultrahigh obdurability and preparation method thereof |
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锻造钢锭的几何因素对其内部缺陷影响的数值模拟研究;盛星星;《中国优秀硕士论文全文数据库(电子期刊) 工程科技I辑》;20160315(第3期);第22-23页 * |
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Denomination of invention: A steel ingot for forging pipe dies Effective date of registration: 20220621 Granted publication date: 20180824 Pledgee: Weihai commercial bank Limited by Share Ltd. Dezhou branch Pledgor: SHANDONG BAODING HEAVY INDUSTRIAL CO.,LTD. Registration number: Y2022980008171 |