CN1584067A - Process for OCr17Ni4Cu4N6 electroslag ingots by thermal transferring cogging - Google Patents
Process for OCr17Ni4Cu4N6 electroslag ingots by thermal transferring cogging Download PDFInfo
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Abstract
A 0Cr17Ni4Cu4Nb electroslag ingot thermal inputting cogging process includes: 1) electroslag ingot smelting, electroslag ingot demoulding after remelting for 60 mins and entering annealing furnace after demoulding for 15 mins; 2) entering furnace temperature of steel ingot being is greater than or equal to 300deg.C, insulating temperature of annealing furnace 680deg.C, time 4 hrs, and drawing charge temperature of steel ingot 670deg.C; 3) constant refrigerator car thermal inputting electroslag ingot with time to load is less than or equal to 30mins, unloading time is less than or equal to 30 mins and temperature for materials of heating furnace in hot-working workshop. It achieves low cost, simple process and short manufacturing period.
Description
Technical field
The heat that the present invention relates to metallurgy industry martensite PH Stainless Steel ingot is sent the cogging technics method, and the heat that refers in particular to martensite PH Stainless Steel ESR ingot is sent the cogging technics method.
Background technology:
Steel ingot heat send the heat that refers generally to teeming to send, can be divided into elevated temperature heat and send (heat send temperature to be generally AC3 or more than the ACm), low warm sending (it is following that heat send temperature to be generally AC1), steel ingot heat is sent save energy greatly, reduce manufacturing cost, so in Iron and Steel Production producer, be employed widely.ESR ingot (also being referred to as electric slag refusion ingot) is because the singularity of its mode of production seldom adopts heat to send.
Stainless steel can be divided into Martensite Stainless Steel, ferritic stainless steel, austenitic stainless steel, duplex stainless steel, PH Stainless Steel five big steel classes; Martensitic precipitation is a kind of common PH Stainless Steel, it is to separate out second phase tiny, disperse on martensitic matrix, make material reach high strength, high rigidity, have the steel grade of many these classes under softening or as-annealed condition, to carry out forming process.
0Cr17Ni4Cu4Nb (17-4PH) is the martensite PH Stainless Steel of nineteen forty-six U.S.'s exploitation, characteristics with transformation hardening and age hardening, be mainly used in and make the high strength anti-corrosion parts of working below 316 ℃, use quite extensively, be usually used in the required blade steel of large steam turbine generating set.Because the 0Cr17Ni4Cu4Nb steel bears multiple stress (mainly being thermal stresses, martensite transformation stress, season stress) effect in process of cooling, the big more stress that bears of specification is big more, easy to crack more, so in the production process, steel ingot, steel billet, steel all must carry out anneal.
At present, be used for the martensitic precipitation 0Cr17Ni4Cu4Nb (17-4PH) of blade with steel, the mode of production adopts: starting material preparation → electric arc furnace+argon oxygen stove is smelted, cast electrode bar → electroslag remelting furnace is smelted into ESR ingot → hot charging annealing, the slow cooling of ESR ingot annealing back (speed of cooling≤50 ℃/h), ESR ingot temperature≤100 ℃ go out that the cold process furnace of delivering to hot-work cogging workshop of annealing furnace → ESR ingot heats up, soaking → hot-work cogging → annealing → hot-work is become a useful person → annealed → and surface grinding is to trimmed size → detection → warehouse-in.In traditional " ESR ingot-hot charging annealing-cold sending-process furnace heats up; soaking-hot-work cogging " production technique, on the one hand, (the necessary slow cooling of ESR ingot was to≤100 ℃ for up to 3 days for the hot charging annealed, just can go out annealing furnace, if ESR ingot≤300 ℃ go out annealing furnace, because the structural stress that exists in the 0Cr17Ni4Cu4Nb steel, transformation stress, the effect of multiple stress such as thermal stresses, easily cause the cracking of 0Cr17Ni4Cu4Nb steel, scrap, and in the production practice, when 300 ℃～100 ℃ temperature, the ESR ingot cooling rate is very slow, needs 1 day), had a strong impact on the throughput of annealing furnace; On the other hand, deliver to the cold ingot of 0Cr17Ni4Cu4Nb electroslag of hot-work cogging workshop process furnace, also increased the weight of intensification, the soaking burden (energy consumption increases, and the time increases) of process furnace, cause the production cycle of 0Cr17Ni4Cu4Nb steel long, cost is higher.
Summary of the invention:
The present invention develops the processing method that a kind of 0Cr17Ni4Cu4Nb ESR ingot heat is sent cogging, replace traditional " the back cold cogging of sending of ESR ingot hot charging annealing " with " ESR ingot heat is sent cogging ", the production cycle that has solved the 0Cr17Ni4Cu4Nb steel is long, the problem that steel ingot is easy to crack, greatly reduce the metallurgical production cost of making, satisfy customer requirements and market demand.
0Cr17Ni4Cu4Nb ESR ingot heat provided by the invention is sent the processing method of cogging, it is characterized in that adopting the three-step approach heat of " ESR ingot remelting "+" processing of annealing furnace samming "+" ESR ingot is hanged down warm sending " to send technology, satisfy ESR ingot with 〉=300 ℃ temperature (because the steel ingot thermal conductivity is relatively poor, if temperature reduces to shove charge again below 300 ℃, being prone to and bursting phenomenon) heat of advancing process furnace send requirement:
(1) ESR ingot remelting: ESR ingot melting one half; the cooling water flow of water tank at the bottom of the minimizing crystallizer; discharge is 40%～65% of normal cooling discharge; (serve as to guarantee the crystallization and freezing of ESR ingot and the work-ing life of crystallizer, crystallizer must adopt water-cooled protection with the temperature head that reduces ESR ingot head, afterbody.Because the process that esr is a local melting, refining, solidify, if in the ESR ingot reflow process, cooling water flow is kept the normal cooling discharge of original state all the time, then ESR ingot afterbody temperature may be lower than 300 ℃, influences the ESR ingot quality); Remelting finishes back 50～70 minutes, carries out the ESR ingot demoulding, the stove of advancing and retreat in 15 minutes after the ESR ingot demoulding, temperature 〉=300 ℃ of guaranteeing the ESR ingot afterbody;
(2) the annealing furnace samming is handled: the charging temperature of steel ingot 〉=300 ℃; The holding temperature T of annealing furnace
Annealing=650 ℃～690 ℃, the soaking time of annealing furnace=4～4.5h; The ESR ingot tapping temperature is 650～690 ℃;
(3) low warm the sending of ESR ingot: adopt conventional thermos van heat to send ESR ingot, ESR ingot treats that the entrucking time was controlled within 30 minutes, the time of unloading was controlled within 30 minutes, make heat send the ESR ingot temperature drop (temperature loss) of whole process to be controlled within 350 ℃, guarantee that steel ingot enters furnace temp 〉=300 ℃; Temperature to be expected (starting temperature) T≤A of hot-work cogging workshop process furnace
C1=600 ℃～670 ℃, (thermal conductivity of 0Cr17Ni4Cu4Nb steel ingot is relatively poor, so temperature to be expected should be controlled at A
C1Under comparatively high temps, can ensure the quality of products like this, can reduce production costs again).
Compare with prior art, the present invention has following advantage:
1. the production cycle shortens greatly;
2. metallurgical manufacturing cost reduces greatly;
3. the metal billet yield improves greatly;
4. the steel ingot condemnation factor reduces greatly.
Description of drawings
Fig. 1 is ESR ingot annealing furnace heat preservation method figure
Specific embodiments:
Certain Iron And Steel Company implements patent of the present invention, adopt the three-step approach heat of " ESR ingot remelting "+" processing of annealing furnace samming "+" ESR ingot is hanged down warm sending " to send technology, satisfy the heat that 0Cr17Ni4Cu4Nb ESR ingot (ingot weighs 2 tons) advances process furnace with 〉=300 ℃ temperature and send requirement: (1) ESR ingot remelting: ESR ingot melting one half, the cooling water flow of water tank at the bottom of the minimizing crystallizer, discharge is 55% of normal cooling discharge, to reduce the temperature head of ESR ingot head, afterbody, guarantee temperature 〉=300 ℃ of ESR ingot afterbody; When remelting finishes back 60 minutes, carry out the ESR ingot demoulding, the stove of advancing and retreat in 10 minutes after the ESR ingot demoulding; (2) the annealing furnace samming is handled: the charging temperature of steel ingot=1000 ℃～350 ℃ 〉=300 ℃ (ESR ingot head temperature≤1000 ℃, afterbody temperature 〉=350 ℃); The holding temperature of annealing furnace is 650 ℃～690 ℃=680 ℃, and the soaking time of annealing furnace is 4 hours; The ESR ingot tapping temperature is 650 ℃～690 ℃=670 ℃; (3) low warm the sending of ESR ingot: adopt thermos van heat to send ESR ingot, ESR ingot treats that the entrucking time is 27 minutes, and the time of unloading is 22 minutes; The ESR ingot hot conveying vehicle temperature of packing into is 460 ℃～500 ℃, and going out the hot conveying vehicle temperature is 420 ℃～470 ℃, and going into furnace temp is 400 ℃ ~ 450 ℃; Temperature T to be expected=600 of hot-work cogging workshop process furnace ℃～670 ℃=650 ℃.Implementing patent of the present invention carries out heat to the 0Cr17NI4Cu4Nb ESR ingot and send cogging, it is simple to have technology, with short production cycle, metallurgical low cost of manufacture, the characteristics that billet yield is high, compare with traditional " the back cold cogging of sending of ESR ingot hot charging annealing " production technique, the annealing furnace soaking time was reduced to 4 hours from original 72 hours, hot-work workshop process furnace heats up to ESR ingot, soaking time was reduced to 11 hours from original 16 hours, not only alleviated the production burden of annealing furnace greatly, also shorten the production cycle more than 4 days, and the steel ingot condemnation factor is reduced to 0.5% from 2%, and the metal billet yield is increased to more than 83% from 80%.Send the big bar of 0Cr17Ni4Cu4Nb (φ 110 ~ φ 180mm) of cogging production by heat, material amount all satisfies the relevant regulations of standard GB/T8732-1988 in it, surface quality is stable, meet the quality product requirement, product qualified rate reaches 99%, the needs that adapt to customer requirements and market development, remarkable in economical benefits.
Claims (1)
1, OCr17Ni4Cu4Nb ESR ingot heat is sent the processing method of cogging, it is characterized in that adopting the three-step approach heat of " ESR ingot remelting "+" processing of annealing furnace samming "+" ESR ingot is hanged down warm sending " to send technology, satisfy the heat that ESR ingot advances process furnace with 〉=300 ℃ temperature and send requirement:
(1) ESR ingot remelting: ESR ingot melting one half, the cooling water flow of water tank at the bottom of the minimizing crystallizer, discharge is 40%～65% of normal cooling discharge; Remelting finishes back 50～70 minutes, carries out the ESR ingot demoulding, the stove of advancing and retreat in 15 minutes after the ESR ingot demoulding;
(2) the annealing furnace samming is handled: the charging temperature of steel ingot 〉=300 ℃; The holding temperature of annealing furnace is 650 ℃～690 ℃, the soaking time 4～4.5h of annealing furnace; The ESR ingot tapping temperature is 650～690 ℃;
(3) low warm the sending of ESR ingot: adopt conventional thermos van heat to send ESR ingot, ESR ingot treats that the entrucking time is controlled within 30 minutes, and the time of unloading was controlled within 30 minutes; Temperature≤AC1=600 to be expected ℃～670 ℃ of hot-work cogging workshop process furnace.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100251044A CN1302130C (en) | 2004-06-11 | 2004-06-11 | Process for OCr17Ni4Cu4N6 electroslag ingots by thermal transferring cogging |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100251044A CN1302130C (en) | 2004-06-11 | 2004-06-11 | Process for OCr17Ni4Cu4N6 electroslag ingots by thermal transferring cogging |
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| CN1584067A true CN1584067A (en) | 2005-02-23 |
| CN1302130C CN1302130C (en) | 2007-02-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102581000A (en) * | 2011-01-10 | 2012-07-18 | 宝山钢铁股份有限公司 | Production method for rolling and cogging big cast ingot of high-carbon high-alloy cold-working die steel |
| CN102806337A (en) * | 2012-08-16 | 2012-12-05 | 太原钢铁(集团)有限公司 | Processing method of solution strengthening-type nickel-based alloy electroslag ingot hot delivery homogenous cogging |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1032546C (en) * | 1993-03-17 | 1996-08-14 | 鞍山钢铁公司 | Rolling tech. for titanium treated steel plate high-temp. recrystallization rolling fast cooling to substitute for intermediate and low temp. controlled rolling |
| JPH0790366A (en) * | 1993-09-20 | 1995-04-04 | Kobe Steel Ltd | Production of high mn stainless series nonmagnetic steel slab good in surface property |
| JPH0820847A (en) * | 1994-07-06 | 1996-01-23 | Nisshin Steel Co Ltd | Production of high aluminum-containing ferritic stainless steel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102581000A (en) * | 2011-01-10 | 2012-07-18 | 宝山钢铁股份有限公司 | Production method for rolling and cogging big cast ingot of high-carbon high-alloy cold-working die steel |
| CN102581000B (en) * | 2011-01-10 | 2014-04-30 | 宝钢特钢有限公司 | Production method for rolling and cogging big cast ingot of high-carbon high-alloy cold-working die steel |
| CN102806337A (en) * | 2012-08-16 | 2012-12-05 | 太原钢铁(集团)有限公司 | Processing method of solution strengthening-type nickel-based alloy electroslag ingot hot delivery homogenous cogging |
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