CN109762999A - A kind of smelting process of HR-2 steel - Google Patents
A kind of smelting process of HR-2 steel Download PDFInfo
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- CN109762999A CN109762999A CN201811610978.4A CN201811610978A CN109762999A CN 109762999 A CN109762999 A CN 109762999A CN 201811610978 A CN201811610978 A CN 201811610978A CN 109762999 A CN109762999 A CN 109762999A
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Abstract
The present invention provides a kind of smelting processes of HR-2 steel, comprising: alloy raw material is carried out non-vacuum induction furnace and smelts then progress duplex electroslag remelting, obtains HR-2 steel；The electroslag slag system of the duplex electroslag remelting includes CaF2、Al2O3, CaO and MgO；The CaF2、Al2O3, CaO and MgO mass ratio be (48~52): (22~28): (18~22): (4~6).The present invention is by optimizing antivacuum primary smelting method of deoxidation, ensure to reduce resistant to hydrogen stick oxide buildup, using electroslag remelting twice, optimize slag system proportion simultaneously, solve the problems, such as that high-nitrogen high-manganese ultra-low carbon austenitic stainless steel smelts Control and Inclusion Removal, on the basis of ensuring that each ingredient meets technical requirements, realize high-purity smelt, it is all kinds of be mingled with meet standard requirements.
Description
Technical field
The present invention relates to metallurgical technology field more particularly to a kind of smelting processes of HR-2 steel.
Background technique
HR-2 resistant to hydrogen steel is the hydrogen-storing device material that China's last century the eighties start independent development, with excellent
Resistant to hydrogen damage and quantization comprehensive mechanical property and be widely used in petrochemical industry and petroleum gas, core, Aeronautics and Astronautics etc.
In engineering system, HR-2 resistant to hydrogen steel is mainly made of Fe, Cr, Mn, Ni, N, steady possessed by general austenitic stainless steel except having
Outside qualitative and corrosion resistance, also there is the yield strength more much higher than other austenitic steels and good hydrogen embrittlement energy.HR-2
Resistant to hydrogen steel requires still have good mechanical property in the case where saturation is flushed with hydrogen state, very harsh to nonmetal inclusion requirement, often
Oxide, the underproof problem of Mechanism of Formation of The Globular Inclusions in appearance production process.Therefore, being mingled with as ability for HR-2 steel how is reduced
The hot spot of domain research.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of smelting processes of HR-2 steel, using smelting provided by the invention
The inclusion content in HR-2 steel that smelting method is prepared is less.
The present invention provides a kind of smelting processes of HR-2 steel, comprising:
Alloy raw material is subjected to non-vacuum induction furnace and smelts then progress duplex electroslag remelting, obtains HR-2 steel.
The present invention does not have special limitation to the alloy raw material, using preparation HR-2 steel well known to those skilled in the art
Alloy raw material, preferably include the source C, the source Mn, the source Si, the source P, the source S, the source Cr, the source Ni, the source N and Fe in the alloy raw material
Source.In the present invention, the alloy raw material preferably include pure iron, crome metal, pure nickel, chromic carbide iron (such as Cr04,
FeCr65C0.03 meets GB/T5683-2008 standard requirements), nitrogenization manganese metal (N-JMn) and nitrided ferro-chromium (N-Cr,
Meet YB/T4135-2005 standard requirements).The present invention does not have special limitation to the source of the alloy raw material, uses
The alloy raw material of mentioned kind well known to those skilled in the art can be bought by market and be obtained.
In the present invention, the usage ratio of each element is preferably matched according to the ingredient of HR-2 steel in the alloy raw material
?.In the present invention, the ingredient of the HR-2 steel is preferred are as follows:
The C of≤0.04wt%；The Si of≤1wt%；The Mn of 8~10wt%；The P of≤0.025wt%；≤ 0.015wt%'s
S；The Ni of 5.5~8wt%；The Cr of 19~21.5wt%；The N of 0.2~0.34wt%；Surplus is Fe.
In the present invention, the non-vacuum induction furnace smelting preferably includes:
Alloy raw material shove charge is subjected to initial melting, fine melt, deoxidation alloying, tapping and casting.
In the present invention, the method that the shove charge carries out initial melting preferably includes:
Pure iron, crome metal, pure nickel are packed into furnace, N-JMn (nitrogenization manganese metal) and N-Cr (nitrided ferro-chromium) are filled with furnace
Enter the 60% of total dosage, furnace charge is then subjected to initial melting；By remaining 40%N-JMn and N-Cr after load melting 90%
It is added portionwise, slag charge is added during load melting.
In the present invention, the dosage of the pure iron, crome metal, pure nickel, N-JMn and N-Cr according to required preparation HR-2 steel
Ingredient matched.
In the present invention, molten steel can be caused acutely to boil after molten steel being added due to N-JMn, to ensure that it is more that production safety must divide
Batch is added, and is preferably added after load melting quality >=90%.
In the present invention, the ingredient of the slag charge preferably includes CaF2And CaO；The CaF2Mass ratio with CaO is preferably
(1~1.4): 1, more preferably (1.1~1.3): 1, most preferably 1.2:1.In the present invention, the amount that slag charge is added preferably ensures that
Molten bath is not exposed to atmosphere.
In the present invention, the temperature of the initial melting is preferably 1430~1480 DEG C, and more preferably 1440~1470 DEG C,
Most preferably 1450~1460 DEG C, time of the initial melting preferably >=240 minutes, more preferably 240~270 minutes, most
Preferably 250~260 minutes.
In the present invention, the temperature of the fine melt is preferably 1450~1480 DEG C, and more preferably 1460~1470 DEG C.At this
In invention, preferably use is refined during the fine melt, the time of the refining preferred > 40min, in the refining process
It is preferred that repeatedly stirring, makes fusible slag.
In the present invention, the method for the deoxidation alloying is preferred are as follows:
After the completion of fine melt, first carries out precipitation desoxydation and carry out alloying again, be finally diffused deoxidation.
In the present invention, the method for the precipitation desoxydation is preferred are as follows:
Ni-Mg block and Si-Ca block are added into the aluminium alloy after above-mentioned fine melt.
In the present invention, the ingredient of the Ni-Mg block in parts by weight, preferably includes:
75~85 parts of Ni；
15~25 parts of Mg.
In the present invention, the parts by weight of the Ni are preferably 78~82 parts, and more preferably 80 parts.In the present invention, institute
The parts by weight for stating Mg are preferably 18~22 parts, and more preferably 20 parts.In the present invention, the ingredient of the Ni-Mg block is preferred are as follows:
The Mg of the Ni and 20wt% of 80wt%.The present invention does not have special limitation to the source of the Ni-Mg, using those skilled in the art
The preparation method of Ni-Mg alloy known to member is prepared, and vaccum sensitive stove such as can be used and match according to alloying component and melt
Refining is prepared.
In the present invention, the ingredient of the Si-Ca block is preferably that calcium-silicon (meets YB/T5051-2016 standard requirements
), more preferably Ca31Si60 or Ca28Si60.The present invention does not have special limitation to the source of the Si-Ca block, uses
The calcium-silicon of mentioned kind well known to those skilled in the art can be bought by market and be obtained.
In the present invention, the additional amount of the Ni-Mg block is preferably 1~2kg/t steel, more preferably 1.2~1.8kg/t
Steel, most preferably 1.4~1.6kg/t steel；The additional amount of the Si-Ca block is preferably 4~5.5kg/t steel, more preferably 4.5~
5kg/t steel.
In the present invention, after the completion of the precipitation desoxydation it is also preferable to include:
Ca-Si block is added into the aluminium alloy after precipitation desoxydation and carries out alloying.
In the present invention, the ingredient of the Ca-Si block and the Si-Ca block during precipitation desoxydation described in above-mentioned technical proposal
And source is consistent, details are not described herein.In the present invention, it is preferred to after 6~8min is added in Si-Ca block during above-mentioned precipitation desoxydation
It adds Ca-Si block and carries out alloying, more preferably 7min.In the present invention, the dosage of the Si-Ca block be preferably 1.03~
1.37kg/t steel, more preferably 1.05~1.35kg/t steel, more preferably 1.1~1.3kg/t steel, most preferably 1.2kg/t steel.
In the present invention, analysis is preferably sampled after Ca-Si block being added, the temperature of the sampling is preferred >=and 1450 DEG C.
In the present invention, after the alloying it is also preferable to include:
It completes to carry out diffusive deoxidation after Ca-Si block is added, the deoxidier that the diffusive deoxidation uses is preferably Al-CaO agent
With Al powder.
The present invention does not have special limitation to the type of the Al-CaO agent and source, using known to those skilled in the art
Steelmaking process in the Al-CaO agent that uses.In the present invention, the dosage of the Al-CaO agent is preferably 4~5kg/t steel,
More preferably 4.2~4.7kg/t steel, most preferably 4.3~4.5kg/t steel, the dosage of the Al powder are preferably 3~4kg/t steel,
More preferably 3.2~3.8kg/t steel, most preferably 3.4~3.6kg/t steel.
In the present invention, the temperature of the tapping is preferably 1510~1530 DEG C, and more preferably 1520 DEG C.In the present invention
In, the calm time is preferably 5~8min after the tapping, more preferably 6~7min.In the present invention, the tapping process
In preferably use white brick packet.
In the present invention, it is preferably protected using argon gas in the casting process.In the present invention, it is preferably obtained after the casting
Obtain the electrode bar that diameter is 230~250mm, more preferably 235~245mm, most preferably 240mm.
In the present invention, the method for the duplex electroslag remelting preferably successively carries out an electroslag remelting and secondary electroslag
Remelting.In the present invention, the ESR ingot that diameter is 350~370mm is preferably obtained after an electroslag remelting, more preferably
355~365mm, most preferably 360mm；The secondary electroslag remelting preferably obtains the ESR ingot that diameter is 540~560mm, more
Preferably 545~555mm, most preferably 550mm.
In the present invention, the electroslag slag system ingredient that an electroslag remelting and secondary electroslag remelting use preferably includes:
CaF2、Al2O3, CaO and MgO；
The CaF2、Al2O3, CaO and MgO mass ratio be preferably 50:25:20:5.
In the present invention, the quantity of slag of an electroslag remelting is preferably 34~38kg, and more preferably 35~37kg is optimal
It is selected as 36kg.In the present invention, the quantity of slag of the secondary electroslag remelting is preferably 120~130kg, more preferably 122~
128kg, most preferably 124~126kg.
In the present invention, the voltage of an electroslag remelting is preferably 51~55V, more preferably 52~54V, most preferably
For 53V.In the present invention, the voltage of the secondary electroslag remelting is preferably 73~79V, more preferably 74~78V, most preferably
75~77V.
In the present invention, the electric current of an electroslag remelting is preferably 7000~8600A, more preferably 7300~
8300A, most preferably 7600~8000A.In the present invention, the electric current of the secondary electroslag remelting be preferably 8500~
12000A, more preferably 9000~11500A, most preferably 9500~11000A.
In the present invention, an electroslag remelting loading time preferably >=20min.In the present invention, described secondary
The loading time of electroslag remelting preferably >=30min.
In the present invention, the mould cool time of an electroslag remelting is preferably 30~40min, more preferably 32~
38min, most preferably 34~36min.In the present invention, the mould cool time of the secondary electroslag remelting is preferably 50~60min,
More preferably 52~58min, most preferably 52~56min.
In the present invention, the water temperature of an electroslag remelting is preferably 42~58 DEG C, more preferably 45~55 DEG C, optimal
It is selected as 48~52 DEG C.In the present invention, the water temperature of the secondary electroslag remelting is preferably 40~50 DEG C, more preferably 42~48
DEG C, most preferably 44~46 DEG C.
In the present invention, after the duplex electroslag remelting preferably by obtained product carry out forging rolling cogging, become a useful person, detect a flaw and
Examine storage.The present invention does not have special limitation to the forging rolling cogging, the method become a useful person, detect a flaw and examined, using this field
Method known to technical staff carries out.
HR-2 steel prepared by the present invention meets GJB5724-2006 " resistant to hydrogen rod iron specification " and C3S237-91 " HR-2 steel skill
Art agreement " standard requirements.
HR-2 steel in the present invention is produced according to GJB5724-2006 and C3S237-91 technical requirements, is smelted using non-real
Sky induction smelting+duplex electroslag remelting process requirement, acquisition are mingled with the extremely low high-purity HR-2 steel of content.The present invention passes through optimization
Antivacuum primary smelting method of deoxidation, it is ensured that reduce resistant to hydrogen stick oxide buildup, using electroslag remelting twice, while optimizing slag
System's proportion solves the problems, such as that high-nitrogen high-manganese ultra-low carbon austenitic stainless steel smelts Control and Inclusion Removal, it is ensured that each ingredient meets technology
On the basis of it is required that, realize high-purity smelt, it is all kinds of be mingled with meet standard requirements.
In the present invention, the field trash of the HR-2 steel requires as shown in table 1:
The field trash requirement of 1 HR-2 steel of table
The present invention passes through a smelting of non-vacuum induction furnace using the method for " non-vacuum induction furnace+duplex electroslag remelting "
Refining replaces the deoxidation of Al powder using Ni-Mg block, Si-Ca block, reduces oxide and is mingled with aggregation, electroslag uses duplex electroslag remelting, together
The proportion of Shi Youhua slag system, the HR-2 steel product of acquisition sulfide, oxide inclusions≤1.0 grades on the basis of, by GB/
T10561 evaluation is mingled with, and newly-increased Mechanism of Formation of The Globular Inclusions is less, meets user's design requirement.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is being mingled with for HR-2 steel prepared by the embodiment of the present invention 1；
Fig. 2 is being mingled with for HR-2 steel prepared by the embodiment of the present invention 2；
Fig. 3 is being mingled with for the HR-2 steel of comparative example 1 of the present invention preparation；
Fig. 4 is being mingled with for the HR-2 steel of comparative example 2 of the present invention preparation.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff it is improved or retouching all other example, shall fall within the protection scope of the present invention.
Ni-Mg block used in following embodiment of the present invention is the Ni-Mg of the Mg of Ni and 20wt% that ingredient is 80wt%
Alloy obtains to match melting according to alloying component by the method for the vacuum induction furnace smelting alloy of this field routine；Other
Raw material is commercial goods.
Embodiment 1
In the induction furnace under non-vacuum condition, according to the ingredient of default HR-2 steel, by pure iron, crome metal and pure nickel plate with
Furnace is packed into, and N-JMn and N-Cr is packed into the 60% of total amount with furnace, initial melting, remaining 40% N- are carried out at 1430 DEG C
JMn and N-Cr is dividing a more batches of additions to carry out initial meltings after load melting 90%, and slag charge is added while melting in furnace charge,
Slag charge is the CaF that mass ratio is 1.2:12And CaO, it is ensured that molten bath is not exposed to atmosphere, and the time of initial melting amounts to 240 points
Clock.
Above-mentioned aluminium alloy is subjected to fine melt at 1450 DEG C, refining is used during fine melt, the time of refining is 45 minutes,
It is frequently stirred in refining process, makes fusible slag.
After fine melt, precipitation desoxydation, the conjunction after Ni-Mg block and Si-Ca (Ca31Si60) block to be added to above-mentioned fine melt are carried out
In golden liquid, the additional amount of Ni-Mg block is 1.55kg/t steel, and the additional amount of Si-Ca block is 4.16kg/t steel.
After 7min, Ca-Si (Ca31Si60) block is added into the alloy after precipitation desoxydation and carries out alloying, Ca-Si block
Additional amount is 1.03kg/t steel, and sampling analysis after 7min, probe temperature is 1450 DEG C.
After alloying, it is diffused deoxidation, in the aluminium alloy after Al-CaO agent and Al powder to be added to above-mentioned alloying,
The additional amount of Al-CaO agent is 4.31kg/t steel, and the additional amount of Al powder is 3.45kg/t steel.
Tap at 1510 DEG C, the calm time after tapping is 5min, white brick packet is used in tapping process, then into
Row is poured, and is protected in casting process using argon gas, and the electrode bar that 10 diameters are 240mm is obtained.
By electroslag remelting of electrode bar (2) progress of the 240mm of above-mentioned acquisition, the electroslag of an electroslag remelting
Slag system is the CaF that mass ratio is 50:25:20:52、Al2O3, CaO and MgO, electroslag amount is 34kg, voltage 51V, and electric current is
7000A, loading time are 20 minutes, and mould cool time is 30min, and water temperature is 42 DEG C, obtain the ESR ingot (5 that diameter is 360mm
Branch).
ESR ingot (2.5) by the diameter of above-mentioned acquisition for 360mm carry out secondary electroslag remeltings, secondary electroslag remelting
Electroslag slag system is the CaF that mass ratio is 50:25:20:52、Al2O3, CaO and MgO, electroslag amount is 120kg, voltage 73V, electric current
For 8500A, loading time 30 minutes, the cold temperature of mould was 50 DEG C, and water temperature is 40 DEG C, obtained the HR-2 steel electroslag that diameter is 550mm
Ingot (one).
The ingredient of HR-2 steel ESR ingot prepared by the embodiment of the present invention 1 is tested, testing result is that the embodiment of the present invention 1 is made
It is standby to obtain the ingredient of HR-2 steel ESR ingot are as follows:
The P of the Mn of the Si of the C of 0.02%wt%, 023%wt%, 9.56%wt%, 0.007%wt%, 0.001%wt%
S, the N of the Cr of the Ni of 7.42%wt%, 19.61%wt%, 0.23%wt%, surplus Fe.
The rod product of Φ 105mm is made in HR-2 steel ESR ingot prepared by the embodiment of the present invention 1, forging, carries out metallographic
Microscope amplifies 100 times of observations, detects nonmetal inclusion, as shown in FIG. 1, FIG. 1 is the embodiment of the present invention 1 to prepare for testing result
HR-2 steel is mingled with.
To HR-2 steel ESR ingot prepared by the embodiment of the present invention 1, the rod product of forging Φ 105mm, according to the standard of table 1
It is required that being detected, testing result is that the nonmetal inclusion A (sulfide) of HR-2 steel bar prepared by the embodiment of the present invention 1 is
0.5 grade, it is 1.0 grades that B class, which is mingled with, and it is 1.0 grades that D class, which is mingled with,.
Embodiment 2
In the induction furnace under non-vacuum condition, according to the ingredient of default HR-2 steel, by pure iron, crome metal and pure nickel plate with
Furnace is packed into, and N-JMn and N-Cr is packed into the 60% of total amount with furnace, initial melting, remaining 40% N- are carried out at 1460 DEG C
JMn and N-Cr is dividing a more batches of additions to carry out initial meltings after load melting 90%, and slag charge is added while melting in furnace charge,
Slag charge is the CaF that mass ratio is 1.2:12And CaO, it is ensured that molten bath is not exposed to atmosphere, and the time of initial melting is 250 points total
Clock.
Above-mentioned aluminium alloy is subjected to fine melt at 1470 DEG C, refining is used during fine melt, the time of refining is 50 minutes,
It is frequently stirred in refining process, makes fusible slag.
After the completion of fine melt, precipitation desoxydation is carried out, after above-mentioned fine melt is added in Ni-Mg block and Si-Ca (Ca28Si60) block
In aluminium alloy, the additional amount of Ni-Mg block is 1.58kg/t steel, and the additional amount of Si-Ca block is 4.32kg/t steel.
After 7min, Ca-Si block (Ca28Si60) is added into the aluminium alloy after precipitation desoxydation and carries out alloying, Ca-Si block
Additional amount be 1.16kg/t steel, sampling analysis after 7min, probe temperature is 1460 DEG C.
After alloying, it is diffused deoxidation, in the aluminium alloy after Al-CaO agent and Al powder to be added to above-mentioned alloying,
The additional amount of Al-CaO agent is 4.36kg/t steel, and the additional amount of Al powder is 3.42kg/t steel.
Tap at 1520 DEG C, the calm time after tapping is 7min, white brick packet is used in tapping process, then into
Row is poured, and is protected in casting process using argon gas, and the electrode bar that 10 diameters are 240mm is obtained.
By electroslag remelting of electrode bar (2) progress of the 240mm of above-mentioned acquisition, the electroslag of an electroslag remelting
The CaF for being 50:25:20:5 for mass ratio2、Al2O3, CaO and MgO, electroslag amount is 36kg, voltage 53V, electric current 7300A,
Loading time is 25 minutes, and mould cool time is 35min, and water temperature is 50 DEG C, obtains the ESR ingot (one) that diameter is 360mm.
ESR ingot (2.5) by the diameter of above-mentioned acquisition for 360mm carry out secondary electroslag remeltings, secondary electroslag remelting
Electroslag is the CaF that mass ratio is 50:25:20:52、Al2O3, CaO and MgO, electroslag amount is 125kg, voltage 76V, and electric current is
9000A, loading time are 35 minutes, and the cold temperature of mould is 55 DEG C, and water temperature is 45 DEG C, obtain the HR-2 steel electroslag that diameter is 550mm
Ingot (one).
The ingredient of HR-2 steel ESR ingot prepared by the embodiment of the present invention 2 is tested, testing result is that the embodiment of the present invention 2 is made
It is standby to obtain the ingredient of HR-2 steel ESR ingot are as follows:
The P of the Mn of the Si of the C of 0.023%wt%, 0.21%wt%, 9.58%wt%, 0.006%wt%, 0.001%
The N of the Cr of the Ni of the S of wt%, 7.64%wt%, 19.65%wt%, 0.29%wt%, surplus Fe.
HR-2 steel ESR ingot prepared by the embodiment of the present invention 2, forged cogging roll as the rod product of Φ 65mm,
Nonmetal inclusion detection is carried out, testing result is as shown in Fig. 2, Fig. 2 is being mingled with for HR-2 steel prepared by the embodiment of the present invention 2.
To HR-2 steel ESR ingot prepared by the embodiment of the present invention 2, the rod product of the Φ 65mm of rolling, according to the mark of table 1
Alignment request is detected, and testing result is the nonmetal inclusion A (sulfide) of HR-2 steel bar prepared by the embodiment of the present invention 2
It is 0.5 grade, it is 0.5 grade that B class, which is mingled with, and it is 1.0 grades that D class, which is mingled with,.
Embodiment 3
In the induction furnace under non-vacuum condition, according to the ingredient of default HR-2 steel, by pure iron, crome metal and pure nickel plate with
Furnace is packed into, and N-JMn and N-Cr is packed into the 60% of total amount with furnace, initial melting, remaining 40% N- are carried out at 1450 DEG C
JMn and N-Cr is dividing a more batches of additions to carry out initial meltings after load melting 90%, and slag charge is added while melting in furnace charge,
Slag charge is the CaF that mass ratio is 1.2:12And CaO, it is ensured that molten bath is not exposed to atmosphere, and the time of initial melting is 260 points total
Clock.
Above-mentioned aluminium alloy is subjected to fine melt at 1480 DEG C, refining is used during fine melt, the time of refining is 60 minutes,
It is frequently stirred in refining process, makes fusible slag.
After the completion of fine melt, precipitation desoxydation is carried out, after above-mentioned fine melt is added in Ni-Mg block and Si-Ca (Ca31Si60) block
Aluminium alloy in, the additional amount of Ni-Mg block is 1.44kg/t steel, and the additional amount of Si-Ca block is 4.01kg/t steel.
After 7min, Ca-Si (Ca28Si60) block 1.38kg/t steel is added into the aluminium alloy after precipitation desoxydation and carries out alloy
Change, sampling analysis after 7min, probe temperature is 1470 DEG C.
After the completion of alloying, it is diffused deoxidation, in the aluminium alloy after Al-CaO agent and Al powder to be added to above-mentioned alloying,
The additional amount of Al-CaO agent is 4.4kg/t steel, and the additional amount of Al powder is 3.5kg/t steel.
Tap at 1530 DEG C, the calm time after tapping is 8min, white brick packet is used in tapping process, then into
Row is poured, and is protected in casting process using argon gas, and the electrode bar that 10 diameters are 240mm is obtained.
By electroslag remelting of electrode bar (2) progress of the 240mm of above-mentioned acquisition, the electroslag of an electroslag remelting
The CaF for being 50:25:20:5 for mass ratio2、Al2O3, CaO and MgO, electroslag amount is 38kg, voltage 55V, electric current 8300A,
Loading time is 30 minutes, and mould cool time is 40min, and water temperature is 58 DEG C, obtains the ESR ingot (5) that diameter is 360mm.
ESR ingot (2.5) by the diameter of above-mentioned acquisition for 360mm carry out secondary electroslag remeltings, secondary electroslag remelting
Electroslag is the CaF that mass ratio is 50:25:20:52、Al2O3, CaO and MgO, electroslag amount is 130kg, voltage 79V, and electric current is
11500A, loading time are 40 minutes, and the cold temperature of mould is 60 DEG C, and water temperature is 50 DEG C, obtain the HR-2 steel electroslag that diameter is 550mm
Ingot (1).
The ingredient of HR-2 steel ESR ingot prepared by the embodiment of the present invention 3 is tested, testing result is that the embodiment of the present invention 3 is made
It is standby to obtain the ingredient of HR-2 steel ESR ingot are as follows:
The P of the Mn of the Si of the C of 0.017%wt%, 0.30%wt%, 9.50%wt%, 0.006%wt%, 0.001%
The N of the Cr of the Ni of the S of wt%, 7.63%wt%, 19.56%wt%, 0.28%wt%, surplus Fe.
To the embodiment of the present invention 3 prepare HR-2 steel ESR ingot, forged cogging, be squeezed into 66 × 18mm of Φ tubing at
Product are detected according to the standard requirements of table 1, and nonmetal inclusion A (sulfide) is 0.5 grade, and it is 1.0 grades that B class, which is mingled with, D class folder
Miscellaneous is 1.0 grades.
Comparative example 1
HR-2 steel ESR ingot is prepared according to method as described in example 2, the difference from example 2 is that, air induced melting
Deoxidation uses Al powder deoxidation completely, does not add other deoxidiers.
According to the method for embodiment 1, nonmetal inclusion inspection is carried out to the HR-2 steel ESR ingot of comparative example 1 of the present invention preparation
It surveys, testing result is as shown in figure 3, Fig. 3 is being mingled with for the HR-2 steel of comparative example 1 of the present invention preparation.
To the HR-2 steel ESR ingot of comparative example 1 of the present invention preparation, it is rolled into the rod product of Φ 65mm, according to the mark of table 1
Alignment request is detected, and testing result is the nonmetal inclusion A (sulfide) of HR-2 steel bar prepared by comparative example 1 of the present invention
It is 0.5 grade, it is 2.0 grades that B class, which is mingled with, and it is 1.5 grades that D class, which is mingled with,.
Comparative example 2
HR-2 steel ESR ingot is prepared according to method as described in example 2, the difference from example 2 is that, electroslag remelting
Electroslag slag system is the CaF that mass ratio is 60:20:15:52、Al2O3, CaO and MgO.
According to the method for embodiment 1, nonmetal inclusion inspection is carried out to the HR-2 steel ESR ingot of comparative example 2 of the present invention preparation
It surveys, testing result is as shown in figure 4, Fig. 4 is being mingled with for the HR-2 steel of comparative example 2 of the present invention preparation.
To the HR-2 steel ESR ingot of comparative example 2 of the present invention preparation, it is rolled into the rod product of Φ 65mm, according to the mark of table 1
Alignment request is detected, and testing result is the nonmetal inclusion A (vulcanization of HR-2 steel ESR ingot prepared by comparative example 2 of the present invention
Object) it is 0.5 grade, it is 1.0 grades that B class, which is mingled with, and it is 1.5 grades that D class, which is mingled with,.
As seen from the above embodiment, the present invention provides a kind of smelting processes of HR-2 steel, comprising: carries out alloy raw material
Then non-vacuum induction furnace, which is smelted, carries out duplex electroslag remelting, obtain HR-2 steel；The electroslag of the duplex electroslag remelting includes
CaF2、Al2O3, CaO and MgO；The CaF2、Al2O3, CaO and MgO mass ratio be (48~52): (22~28): (18~
22): (4~6).The present invention is by optimizing antivacuum primary smelting method of deoxidation, it is ensured that reduces resistant to hydrogen stick oxide buildup, then passes through
After electroslag remelting twice, while optimizing slag system proportion, solves high-nitrogen high-manganese ultra-low carbon austenitic stainless steel and smelt field trash control
Problem processed, it is ensured that on the basis of each ingredient meets technical requirements, realize high-purity smelt, it is all kinds of be mingled with meet standard requirements.
What has been described above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill of the art
For personnel, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of smelting process of HR-2 steel, comprising:
Alloy raw material is subjected to non-vacuum induction furnace and smelts then progress duplex electroslag remelting, obtains HR-2 steel；
The electroslag slag system of the duplex electroslag remelting includes CaF2、Al2O3, CaO and MgO；
The CaF2、Al2O3, CaO and MgO mass ratio be (48~52): (22~28): (18~22): (4~6).
2. the method according to claim 1, wherein the ingredient of the HR-2 steel are as follows:
The C of≤0.04wt%；
The Si of≤1wt%；
The Mn of 8~10wt%；
The P of≤0.025wt%；
The S of≤0.015wt%；
The Ni of 5.5~8wt%；
The Cr of 19~21.5wt%；
The N of 0.2~0.34wt%；
Surplus is Fe.
3. the method according to claim 1, wherein the method that the non-vacuum induction furnace is smelted includes:
Alloy raw material shove charge is subjected to initial melting, fine melt, deoxidation alloying, tapping and casting.
4. according to the method described in claim 3, it is characterized in that, the method for the deoxidation alloying are as follows:
It first carries out precipitation desoxydation and carries out alloying again, be finally diffused deoxidation.
5. according to the method described in claim 4, it is characterized in that, the deoxidier of the precipitation desoxydation includes Ni-Mg block and Si-
Ca block；
The ingredient of the Ni-Mg block is in parts by weight, comprising:
75~85 parts of Ni；
15~25 parts of Mg；
The ingredient of the Si-Ca block is calcium-silicon.
6. according to the method described in claim 4, it is characterized in that, the deoxidier of the diffusive deoxidation includes Al-CaO agent and Al
Powder.
7. the method according to claim 1, wherein the method for the duplex electroslag remelting are as follows:
Successively carry out an electroslag remelting and secondary electroslag remelting；
The voltage of electroslag remelting is 51~55V；
The voltage of the secondary electroslag remelting is 73~79V.
8. the method according to the description of claim 7 is characterized in that the quantity of slag of an electroslag remelting is 34~38kg；Institute
The quantity of slag for stating secondary electroslag remelting is 120~130kg.
9. the method according to the description of claim 7 is characterized in that the electric current of an electroslag remelting is 7000~8600A；
The electric current of the secondary electroslag remelting is 8500~12000A.
10. the method according to the description of claim 7 is characterized in that the mould cool time of an electroslag remelting be 30~
40min；The mould cool time of the secondary electroslag remelting is 50~60min.
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| CN115786809A (en) * | 2022-11-29 | 2023-03-14 | 江西宝顺昌特种合金制造有限公司 | High-strength Fe-Ni-Cr high-expansion steel and manufacturing method thereof |
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| CN115786809A (en) * | 2022-11-29 | 2023-03-14 | 江西宝顺昌特种合金制造有限公司 | High-strength Fe-Ni-Cr high-expansion steel and manufacturing method thereof |
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