CN109825655A - A kind of large-scale metallurgical slag ladle manufacturing method - Google Patents
A kind of large-scale metallurgical slag ladle manufacturing method Download PDFInfo
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- CN109825655A CN109825655A CN201910233222.0A CN201910233222A CN109825655A CN 109825655 A CN109825655 A CN 109825655A CN 201910233222 A CN201910233222 A CN 201910233222A CN 109825655 A CN109825655 A CN 109825655A
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- slag ladle
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Abstract
Present invention design discloses a kind of large-scale metallurgical slag ladle manufacturing method, it is characterised in that the following steps are included: S1, manufactures sand mold mould according to design size, checks, mould assembling after tryoff；S2, prefabricated molten steel are poured；S3, knockout of being unpacked after casting complete after cooling a period of time, carries out cleaning after annealing to casting；S4 is tempered after eliminating casting surface defect；S5 checks casting dimension, casting quality, smooth cast(ing) surface.The present invention can effectively radiate, and can prevent slag ladle using deformation failure and prevent slag ladle bottom crack；Trunnion can be used instead using failure, trunnion and tank body interference fit, while high-grade be bolted with 12；Trunnion pedestal and slag ladle ontology are cast as one, welding difficulty when not only can solve manufacture in this way, but also slag ladle integral strength can be improved.
Description
Technical field
The present invention relates to field of metallurgy, and in particular to a kind of large-scale metallurgical slag ladle manufacturing method.
Background technique
The container of slag ladle Sheng steel slag used when being with for smelting iron and steel.For at present, existing slag ladle capacity all exists substantially
33 cubic metres hereinafter, rare 33 cubic metres or more of slag ladle.
Due to the particularity and complexity of slag ladle use environment, the usual service life is not grown.Meanwhile existing slag ladle manufacture and
Have the following problems when use: 1, trunnion pedestal and slag ladle ontology weld after manufacturing forming respectively, and inner cavity is deeper, and welding is very tired
It is difficult；2, deformation failure when using；3, tank bottom crackle；4, main force part trunnion pedestal and ontology junction drawing crack.
Summary of the invention
Background technique there are aiming at the problem that, the purpose of the present invention is to provide a kind of good heat dissipation, can prevent slag ladle from becoming
Shape failure and bottom crack, replaceable trunnion volume reach 36 cubic metres of large-scale metallurgical slag ladle manufacturing method.
In order to achieve the above objectives, the large-scale metallurgical slag ladle that the present invention designs is greater than the tank of tank bottom diameter including tank mouth diameter
Body, tank mouth are equipped with stiffening ring；It is characterized by: the tank wall opposite direction is equipped with trunnion pedestal, trunnion and trunnion pedestal are removable
Unload connection；The concordant face of trunnion base bottom to the tank body external wall of upper portion between tank mouth is equipped at intervals with the reinforcement of three annulars
It is blue；Multiple perpendicular gussets are equipped between stiffening ring and reinforcement flange, between adjacent reinforcement flange；Inner tank wall with
Angle between tank bottom is at 105 °~110 °.
Preferably, the tank body, trunnion pedestal, stiffening ring, reinforcement flange and gusset one moulding by casting.So guarantee slag
There is a sufficient intensity in the main force part of tank --- trunnion pedestal ---, not by drawing crack when use, takes monoblock cast, i.e. trunnion base
Seat and slag ladle ontology are cast as one, welding difficulty when not only can solve manufacture in this way, but also slag ladle integral strength can be improved.
Preferably, inner tank wall is seamlessly transitted by circular arc to tank bottom.
Preferably, set between stiffening ring bottom surface at the top of each trunnion pedestal there are three gusset, stiffening ring with it is close
Gusset there are six being set between the reinforcement flange of tank mouth.
Preferably, it is located in the middle in reinforcing being located between flange and the reinforcement flange of close tank mouth equipped with eight gussets
Between reinforce flange and close to tank bottom reinforcement flange between six gussets of hand.
Preferably, tank body lower part outer wall is equipped with eight and the reinforcement flange auxiliary bar connected vertically close to tank bottom.
It is further preferred that wherein four auxiliary bar two underfaces for being respectively provided at trunnion pedestal for one group, remaining is auxiliary
Muscle interval is helped to be located at tank wall.
Still further preferably, circumferential muscle is equipped in the middle part of shown auxiliary bar.
Preferably, the trunnion is ladder shaft-like part, is interference fitted H7/s6 between the trunnion and the trunnion pedestal.
A kind of large-scale metallurgical slag ladle manufacturing method that the present invention designs, it is characterised in that the following steps are included:
S1 manufactures sand mold mould according to design size, checks, mould assembling after tryoff；
S2, prefabricated molten steel are poured；
S3, knockout of being unpacked after casting complete after cooling a period of time, carries out cleaning after annealing to casting；
S4 is tempered after eliminating casting surface defect；
S5 checks casting dimension, casting quality, smooth cast(ing) surface.
Preferably, in S1, sand mold, which hits tight smoothing, prevents the case that rises, and wall thickness is avoided to thicken, and chromite sand is used at fillet；
Preferably, in S1, big core mold thickness is selected, ruler and contraction absolute value, big core mold thickness control are stretched according to big core
50mm thickness straw bag is twined on 250mm, core iron, increases the deformability of fuse
Preferably, in S2, molten steel is as follows according to mass fraction (%) component: C 0.17~0.20, Si 0.30~0.50,
Mn 0.50~0.80, S≤0.012, P≤0.015, remaining is Fe.
Preferably, in S2, inner nozzle dispersion makes molten steel even into type chamber, crosses thermosetting fire check at anti-waterstop port.
Preferably, in S3, the time for being poured heat preservation is 70~75 hours.
Preferably, in S3, annealing process is as follows: first being risen to after 680 DEG C with the speed of 80 DEG C/h and keeps the temperature 2h, then again with 80
DEG C/speed of h keeps the temperature 10h after rising to 880 DEG C, then furnace cooling.
Preferably, in S4, casting defect is removed using carbon arc air gouging or gas flame cuttiug, and polish off carburized layer.
Preferably, in S5, cast(ing) surface requires outer surface convex-concave degree < 5mm, inner surface convex-concave degree < 3mm.
The beneficial effects of the present invention are: having fully considered problems of the prior art in the design of slag ladle structure, being
Reinforce effectively radiating, prevent slag ladle using deformation failure, appearance laterally reinforces flange, width 350mm, muscle height using three layers
300-350mm, longitudinal rib are 38；To prevent slag ladle bottom crack, tank bottom is with a thickness of 125mm；To use failure convenient for trunnion
It can use instead, trunnion and tank body are connected as inserted (trunnion hole and trunnion on trunnion pedestal are assembled together after processing respectively), mistake
It is full of cooperation, while high-grade is bolted with 12；To guarantee that the main force part of slag ladle (trunnion pedestal) has sufficient intensity, make
Used time, when design, took monoblock cast, i.e. trunnion pedestal and slag ladle ontology is cast as one, and both can solve system so not by drawing crack
Welding difficulty when making, and slag ladle integral strength can be improved.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the structural schematic diagram of slag ladle of the present invention
Fig. 2 is the structural schematic diagram of trunnion of the present invention
Fig. 3 is technical process for casting figure of the invention
Fig. 4 is slag ladle foundary methods drawing of the invention
Fig. 5 is slag ladle heat treatment cycle curve of the present invention
In figure: tank body 1, trunnion pedestal 3, trunnion 4, reinforces flange 5, gusset 6, auxiliary bar 7, circumferential muscle 8 at stiffening ring 2
Specific embodiment
Below by FIG. 1 to FIG. 5 and the modes of some alternative embodiments of the invention is enumerated, to technical side of the invention
Case (including optimal technical scheme) is described in further detail.Obviously, described embodiment is only of the invention one
Divide embodiment, instead of all the embodiments.Based on the embodiment of the present invention, those of ordinary skill in the art are not making wound
Every other embodiment obtained under the premise of the property made labour, shall fall within the protection scope of the present invention.
As shown in Figure 1, the large-scale metallurgical slag ladle that the present invention designs, the tank body 1 of tank bottom diameter, tank are greater than including tank mouth diameter
Mouth is equipped with stiffening ring 2；The 1 outer wall opposite direction of tank body is equipped with trunnion pedestal 3, and trunnion 4 is detachably connected with trunnion pedestal 3；Trunnion
The concordant face of 3 bottom of pedestal to 1 external wall of upper portion of tank body between tank mouth is equipped at intervals with the reinforcement flange 5 of three annulars；Stiffening ring 2
Multiple perpendicular gussets 6 are equipped between reinforcement flange 5, between adjacent reinforcement flange 5；1 inner wall of tank body and tank bottom
Between angle at 105 °~110 °.
Preferably, the tank body 1, trunnion pedestal 3, stiffening ring 2, reinforcement flange 5 and the integrated cast molding of gusset 6.So
Guarantee that the main force part of slag ladle --- trunnion pedestal --- has a sufficient intensity, not by drawing crack when use, takes monoblock cast, i.e.,
Trunnion pedestal and slag ladle ontology are cast as one, welding difficulty when not only can solve manufacture in this way, but also that slag ladle can be improved is integrally strong
Degree.
Preferably, 1 inner wall of tank body is seamlessly transitted by circular arc to tank bottom.
Preferably, set between 4 top of each trunnion pedestal and 2 bottom surface of stiffening ring there are three gusset 6, stiffening ring 2 with
Gusset 6 there are six being set between the reinforcement flange of tank mouth.
Preferably, it is located in the middle and reinforces flange 5 and be equipped with eight gussets 6 between the reinforcement flange 5 of tank mouth, be located at
Intermediate reinforces flange 5 and six gussets 6 of hand between the reinforcement flange 5 of tank bottom.
Preferably, 1 lower part outer wall of tank body is equipped with eight and the auxiliary bar 7 connected vertically of reinforcement flange 5 close to tank bottom.
It is further preferred that wherein four auxiliary bar 7 two underfaces for being respectively provided at trunnion pedestal 3 for one group, remaining
The interval of auxiliary bar 7 is located at 1 outer wall of tank body.
Still further preferably, circumferential muscle 8 is equipped in the middle part of shown auxiliary bar 7.
As shown in Fig. 2, the trunnion 4 is ladder shaft-like part, it is interference fitted between the trunnion 4 and the trunnion pedestal 3
H7/s6.It is detachably connected by 12 high-strength bolts.
Slag ladle volume 36m of the present invention3, 67 tons of weight, tank mouth diameter phi 5200mm, total high 3730mm, molten steel needed for casting
76 tons of total amount, belong to " three surpassing " (superelevation, ultra-wide, overweight) product, slag ladle superelevation, lift power and tension are big when casting, easily run away；Slag
Tank volume is big, and handling, turn-over are difficult；Molten steel amount is big, and more furnace connection pour, and molten steel amount, liquid steel temperature are difficult to control；Tank mouth size is more than
Annealing furnace fire door size.It is very big to cast difficulty.For guarantee smoothly production, following measures are taken:
(1) special shape mo(u)lding box moulding is used, it is solid with Large Box clamping after mould assembling, it is ensured that not leakers when casting.
(2) using type processed is segmented, handle is hung in setting many places, it is ensured that slag ladle facilitates handling and turn-over；
(3) it is poured using double-contracting, controls two Baogang's waters, adjust liquid steel temperature with argon gas.
(4) annealing furnace fire door is transformed, guarantees that slag ladle can anneal into burner hearth.
Castability guarantees refractory gold ores and measure:
Slag ladle dimensional tolerance, weight tolerance require strictly, and surface quality requirements are high, and (outer surface convex-concave degree is less than 5mm, interior table
Face convex-concave degree is less than 3mm), meanwhile, larger load is born, access times require to be greater than 8000 times, and inherent quality requires also high.
To meet above-mentioned requirements, following measures are taken:
(1) model is made by stretching ruler requirement, it is ensured that wooden model size is accurate；Flange and gusset set pattern draft, are convenient for modulus, with
Exempt to damage sand mold；Model surface brush release agent；Since molding sand makes a concession swell, subtract skin 5mm in technique；
(2) sand mold (core) hits tight smoothing, and circular arc uses chromite sand, and brush alcohol-base paint prevents the case that rises, wall thickness is avoided to increase
It is thick；The big core mold thickness of reasonable selection stretches ruler and contraction absolute value according to big core, and big core mold thickness control is on 250mm, core iron
50mm thickness straw bag is twined, the deformability of fuse is increased；
(3) inner nozzle disperses, and makes molten steel even into type chamber, crosses thermosetting fire check at anti-waterstop port；
(4) tryoff when mould assembling, it is ensured that of uniform size accurate everywhere；At tank mouth wall thickness and thermal center that gusset intersects with flange
Appropriate internal densener is placed at place, eliminates thermal center；
(5) ladle chemistry is controlled；Hazardous elements S, P content in steel are reduced, Molten Steel Cleanliness is improved；Two Baogang's water temperatures
Degree is consistent, controls at 1550 ± 10 DEG C；
(6) loose case, loose case time control are done full annealing processing to casting, are cast with eliminating in 3 hours in time after being poured
Make stress.
Large-scale metallurgical slag ladle manufacturing method of the present invention, process flow is as shown in figure 3, technique is as shown in Figure 4.
Model is made by ruler requirement is stretched, it is ensured that wooden model size is accurate, and wall thickness subtracts skin 5mm, and flange and gusset set pattern draft, just
In modulus, in order to avoid damage sand mold；Sand mold (core), which hits tight smoothing, prevents swell, and wall thickness is avoided to thicken, and chromite sand is used at fillet,
The big core mold thickness of reasonable selection stretches ruler and contraction absolute value according to big core, and big core mold thickness control twines on 250mm, core iron
50mm thickness straw bag increases the deformability of fuse, brush alcohol-base paint；Inner nozzle dispersion, makes molten steel even into type chamber, anti-waterstop port
Located thermosetting fire check；Appropriate internal densener is placed at tank mouth wall thickness and at thermal center that gusset intersects with flange, eliminates thermal center；
Tryoff when mould assembling, it is ensured that of uniform size accurate everywhere；Ladle chemistry is controlled, hazardous elements S, P content in steel are reduced, is improved
Molten Steel Cleanliness；The control of two Baogang's coolant-temperature gages is consistent；Pine case, loose case time control the anti-crack arrest in 3 hours in time after casting
Line guarantees inherent quality；Full annealing processing is done to casting.
Main technologic parameters
A stretches ruler 18 ‰；
B model: external form tank mouth flange group core, remaining real three layers of sample point, joint allowance 10, die joint is located at wooden model and divides mould
At face, three layers of real sample core box point；
C dead head: tank body wall thickness 100mm, tank bottom thickness are 125mm and 365mm, and four riser are arranged in 365 thermal center of wall thickness
Place, makes riser have sufficient feeding, Riser Dimensions φ 600*1000mm to tank body；
D running gate system: open stepped pouring system is used, 8 Dao Gong of every layer of both sides, 16 Nei Shui is divided in two layers of inner nozzle
Mouthful, size φ 80, peg gate be φ 100, totally 2.
E smelts and casting: 62.40 tons of this body weight of slag ladle, 10 tons of water riser weight, consider rise case and Ladle Bottom surplus,
Molten steel total weight is 76 tons, is poured using double-contracting, 38 tons of every Baogang's water, and pouring temperature is 1550 ± 10 DEG C.
The smelting of a molten steel
Molten steel is just refined by 35 tons of EBT electric arc furnaces, and LF furnace refines to obtain, this technique can guarantee the higher degree of purity of molten steel.
EBT is just refined: in strict accordance with power supply curve power transmission, and oxygen blast in due course accelerates scrap melting.Foamed slag has been made in advance, when
Furnace charge is melting down, sampling analysis.After sampling reinforce oxygen blast intensity, reinforce the stirring of molten steel, conducive to inclusion floating, deaerate, go P,
Uniform composition etc..Aim carbon is controlled 0.10% or more, when temperature T >=1630 DEG C, composition P≤0.015%, C:0.10~
0.20%) it, taps.
The refining of LF furnace: lime is added into ladle, and a certain amount of fluorite is added, is sprinkled into suitable reducing agent.Temperature is closed
After suitable, uniform ingredients, sampling analysis carries out chemical component fine tuning according to sampling result, and rare earth is added by 2kg/t molten steel and closes
Gold, tapping.
B type (core), mould assembling
By design technology type (core), mould assembling.
Type (core) processed: moulding, coremaking are an important and complicated production links in Foundry Production, are quality assurances
One important procedure.Sand mold (core), which hits tight smoothing, prevents swell, and wall thickness is avoided to thicken, and chromite sand is used at fillet, is rationally selected
With big core mold thickness, ruler and contraction absolute value are stretched according to big core, big core mold thickness control twines 50mm thickness on 250mm, core iron
Straw bag increases the deformability of fuse；Inner nozzle dispersion, makes molten steel even into type chamber, crosses thermosetting fire check at anti-waterstop port.
Running gate system and water riser are buried by technique.
Mould assembling: conscientiously inspection sand mold (core) quality and size, sand mold (core) whole brush alcohol-base paints, at tank mouth wall thickness,
Appropriate internal densener is placed at the thermal center that trunnion hole position and gusset intersect with flange, eliminates thermal center；Tryoff when mould assembling, it is ensured that everywhere
It is of uniform size accurate, uniform wall thickness, layer-by-layer mould assembling.
C casting
Join pouring technique using to furnace, 76 tons of molten steel total amount, two wrap each 38 tons.Casting ensures molten steel filling velocity, avoids casting
Make defect generation.Pouring temperature, time are controlled by table 4.
1 pouring temperature of table, time, note speed
D casting is leveled
Slag ladle cooling 72 hours shake outs in type, after knockout, band temperature cuts riser, overlap, burr, clears up.
E heat treating castings
Full annealing processing is done after casting cleaning, to eliminate casting stress, annealing curve is as shown in Figure 5:
The processing of f casting defect
If defect occurs in cast(ing) surface, by 2 process for repairing of table.
2 rewelding technique of table
G castings examination
The slag ladle blank of production, checks each key dimension and surface condition.Surface quality: casting flawless, sand
The casting flaws such as eye, stomata, shrinkage cavity, cast(ing) surface is bright and clean smooth, outer surface convex-concave degree < 5mm, inner surface convex-concave degree < 3mm, main
It wants size as shown in table 3, takes with casting casting, heat treatment sample, do mechanics properties testing, testing result is as shown in table 4.
3 1#, 2# slag ladle key dimension (mm) of table
4 slag ladle ontology mechanical property of table
It should be readily apparent to one skilled in the art that the above is merely preferred embodiments of the present invention, not to limit this hair
Bright, all any modification, combination, replacement, improvement etc. made under the spirit and principles in the present invention are all contained in guarantor of the invention
Within the scope of shield.
Claims (9)
1. a kind of large-scale metallurgical slag ladle manufacturing method, it is characterised in that the following steps are included:
S1 manufactures sand mold mould according to design size, checks, mould assembling after tryoff；
S2, prefabricated molten steel are poured；
S3, knockout of being unpacked after casting complete after cooling a period of time, carries out cleaning after annealing to casting；
S4 is tempered after eliminating casting surface defect；
S5 checks casting dimension, casting quality, smooth cast(ing) surface.
2. large-scale metallurgical slag ladle manufacturing method according to claim 1, it is characterised in that: in S1, it is anti-that sand mold hits tight smoothing
Only rise case, and wall thickness is avoided to thicken, and chromite sand is used at fillet.
3. large-scale metallurgical slag ladle manufacturing method according to claim 1, it is characterised in that: in S1, big core mold thickness is selected,
Ruler and contraction absolute value are stretched according to big core, big core mold thickness control twines 50mm thickness straw bag on 250mm, core iron, increases fuse
Deformability.
4. large-scale metallurgical slag ladle manufacturing method according to claim 1, it is characterised in that: in S2, molten steel is according to quality point
Number (%) component is as follows: C0.17~0.20, Si0.30~0.50, Mn0.50~0.80, S≤0.012, P≤0.015, remaining is
Fe。
5. large-scale metallurgical slag ladle manufacturing method according to claim 1, it is characterised in that: in S2, inner nozzle dispersion makes steel
Water crosses thermosetting fire check at anti-waterstop port even into type chamber.
6. large-scale metallurgical slag ladle manufacturing method according to claim 1, it is characterised in that: in S3, be poured the time of heat preservation
It is 70~75 hours.
7. large-scale metallurgical slag ladle manufacturing method according to claim 1, it is characterised in that: in S3, annealing process is as follows: first
Risen to after 680 DEG C with the speed of 80 DEG C/h and keep the temperature 2h, then risen to after 880 DEG C with the speed of 80 DEG C/h again and keep the temperature 10h, then with
Furnace is cooling.
8. large-scale metallurgical slag ladle manufacturing method according to claim 1, it is characterised in that: in S4, using carbon arc air gouging or
Gas flame cuttiug removes casting defect, and polishes off carburized layer.
9. large-scale metallurgical slag ladle manufacturing method according to claim 1, it is characterised in that: in S5, cast(ing) surface requires outer
Surface relief degree < 5mm, inner surface convex-concave degree < 3mm.
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Cited By (2)
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| CN113305268A (en) * | 2021-05-21 | 2021-08-27 | 烟台恒邦合金材料有限公司 | Casting method of 12 cubic meter slag ladle |
| CN113319252A (en) * | 2021-06-04 | 2021-08-31 | 武钢集团襄阳重型装备材料有限公司 | Manufacturing method of ultra-large slag pot |
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| CN113305268A (en) * | 2021-05-21 | 2021-08-27 | 烟台恒邦合金材料有限公司 | Casting method of 12 cubic meter slag ladle |
| CN113319252A (en) * | 2021-06-04 | 2021-08-31 | 武钢集团襄阳重型装备材料有限公司 | Manufacturing method of ultra-large slag pot |
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Application publication date: 20190531 |