CN1062785C - Method of producing seamless hot-finished tube - Google Patents
Method of producing seamless hot-finished tube Download PDFInfo
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- CN1062785C CN1062785C CN95193596A CN95193596A CN1062785C CN 1062785 C CN1062785 C CN 1062785C CN 95193596 A CN95193596 A CN 95193596A CN 95193596 A CN95193596 A CN 95193596A CN 1062785 C CN1062785 C CN 1062785C
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- 238000000034 method Methods 0.000 title claims abstract description 53
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 38
- 239000010959 steel Substances 0.000 claims abstract description 38
- 238000009792 diffusion process Methods 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 4
- 238000009749 continuous casting Methods 0.000 claims description 26
- 238000005096 rolling process Methods 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 17
- 238000000137 annealing Methods 0.000 claims description 12
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- 230000035882 stress Effects 0.000 claims description 11
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 8
- 229910052717 sulfur Inorganic materials 0.000 claims description 8
- 239000011593 sulfur Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 229910000805 Pig iron Inorganic materials 0.000 claims description 4
- 239000004411 aluminium Substances 0.000 claims description 4
- 238000007872 degassing Methods 0.000 claims description 4
- 230000009429 distress Effects 0.000 claims description 4
- 238000010926 purge Methods 0.000 claims description 4
- 235000007164 Oryza sativa Nutrition 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 239000011572 manganese Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 235000009566 rice Nutrition 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 238000006477 desulfuration reaction Methods 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- FXNGWBDIVIGISM-UHFFFAOYSA-N methylidynechromium Chemical compound [Cr]#[C] FXNGWBDIVIGISM-UHFFFAOYSA-N 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 241000209094 Oryza Species 0.000 claims 2
- 238000007664 blowing Methods 0.000 claims 1
- 239000011651 chromium Substances 0.000 claims 1
- 238000010891 electric arc Methods 0.000 claims 1
- 238000012856 packing Methods 0.000 claims 1
- 238000005266 casting Methods 0.000 abstract description 7
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 238000000926 separation method Methods 0.000 abstract 1
- 238000007493 shaping process Methods 0.000 abstract 1
- 238000005242 forging Methods 0.000 description 5
- 238000000465 moulding Methods 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 4
- 238000009847 ladle furnace Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
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- 239000012535 impurity Substances 0.000 description 2
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- 238000009785 tube rolling Methods 0.000 description 2
- 238000009849 vacuum degassing Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 240000004859 Gamochaeta purpurea Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
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- 229910052698 phosphorus Inorganic materials 0.000 description 1
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- 238000004513 sizing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/10—Piercing billets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/466—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B23/00—Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
- B21H1/06—Making articles shaped as bodies of revolution rings of restricted axial length
- B21H1/12—Making articles shaped as bodies of revolution rings of restricted axial length rings for ball or roller bearings
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Heat Treatment Of Steel (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Heat Treatment Of Articles (AREA)
- Extrusion Of Metal (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Metal Rolling (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention concerns a method for the production of a seamless hot-finished tube from steel with reduced deformability, in particular roller-bearing steel, the method calling for a pretreated and degassed as well as deoxidized liquid steel of the required chemical composition to be continuously cast with any cross-section and, after separation of the billet, for the casting to be divided into suitable lengths and shaped. The invention calls for the cut lengths to be heated to the shaping temperature without any preshaping, i.e. as cast, and without any heat treatment (diffusion anealing), and fed to a tube-production plant.
Description
The present invention relates to a kind of method of producing hot-rolled pipe by the especially hypereutectoid steel of high-carbon.
Be used for making the corresponding steel of most rolling bearings by the material of DIN system 100Cr6 with by other standards and manual of standards at European Region, so because high phosphorus content belongs to hypereutectoid steel.In order to produce the raw material of hot-rolled pipe, adopt following method as the various rolling bearing rings of processing.
From the pig iron, vacuum degassing in LD steel converter workshop and ladle furnace and bag, or by another kind of scheme from E steel workshop, through ladle furnace and Bao Nei vacuum degassing, and casting ingot through remelting refining workshop under special circumstances, it rolls into circular pipe blank (R hrenrund) on the large steel ingot rolling mill.This circular pipe blank preferably is shaped to hot-rolled pipe (referring to steel pipe handbook the 10th edition, Vulkan publishing house,, 141-143 page or leaf in 1986) by means of A Saier three-roller type tube rolling method.Usually assel elongator has a swinging heating furnace as firing equipment, is provided with a perforating apparatus that is designed to the cross roll roll piercing mill in its back, is used to cause hollow ingot.This hollow ingot infeeds one by three assel elongators of forming along the equally distributed cross roll of circumference, and cross roll is provided with the expansion diameter-setting equipment.Heat this intervalve in extraction again as behind the rod of core rod, and make hot-rolled pipe through multimachine seat reducing mill with through the sizing mill of postposition.The shortcoming of this method is, employed circular pipe blank size must be near hot-rolled pipe, and plans the just multiple pipe blank rolling or that forge of needs in order to satisfy the supply of material.
Though the A Saier three-high mill is an equipment of producing rolling bearing tubing first-selection, uses predeformation through being everlasting and also utilize other tubulation apparatus during through the furnace charge of diffusion annealing, as push-bench or mandrel rolling mill (Rohrkontistra β en).
Also known production continuous casting billet (Bloom mostly is rectangle greatly) replaces ingot casting (lngot), and is shaped to circular pipe blank through a rolling or forging process.Also can produce a kind of continuous casting billet of circle by another kind of scheme, to substitute rectangle, in this case, this continuous casting billet also is rolled or forges (referring to La Revue de Metallurgie CIT in April, 1989, the 344-350 page or leaf) after cut-out.According to prior art, deformation extent elects forging ratio as or rolling ratio reaches 1: 5.Before the rolling or forging process, always to carry out diffusion annealing, so that reduce or reduce segregation that casting technique brings as far as possible and thick carbide is separated out.All are above-mentioned, and to be used for the production method cost of preformed material all very high, because must be useful on the very big equipment of investment of distortion, and material will move repeatedly.Because bar always needs to cut again through extending, so also form a certain amount of stub bar simultaneously.Fu Jia work each time and transportation step, meaning has the danger that produces other or worsen defective, and getting rid of these faults will increase expense expenditure.
The purpose of this invention is to provide a kind of method of producing hot-rolled pipe by the especially hypereutectoid steel of high-carbon, the cost of comparing it with known method is low, and, adopt method of the present invention can reach high stock utilization and the short through-flow time of material.
For achieving the above object, by the invention provides a kind of like this method of producing seamless hot-finished tube by the especially hypereutectoid steel of high-carbon, according to said method, liquid steel through preliminary treatment and degasification and deoxidation, on request chemical composition cast in continuous pouring, make the continuous casting billet rod that is divided into blank section stand once to be out of shape after cutting off continuous casting billet, wherein: the continuous casting billet material is manufactured into high-purity, has thin carbide to separate out and high fine granularity; Blank section is without any predeformation that is at as-cast condition with do not heat-treat under the situation as diffusion annealing and be heated to forming temperature, and transport to tubulation apparatus, wherein, in the perforation process of whole operation parts as tubulation apparatus, form a kind of stress state in the blank section that will be out of shape, this stress state is reduced at shear stress under the situation of minimum level has a high as far as possible negative stress mean value s
m
Main points of the present invention are the steel undeformed continuous casting billets of the material type of rolling bearing steel especially that use the arbitrary section shape on tubulation apparatus, and traditional so far rolling or forging process that comes the front of having given up has been cancelled the diffusion annealing of prior art requirement.Cancel these operations and saved a large amount of expenses and time.In addition, material obtains better utilization, because cutting repeatedly not so also need not often be cut the head of ingot.Thisly be not out of shape and should be noted that when not having the continuous casting billet of diffusion annealing using, at perforation process during as tubulation apparatus overall process a part of, in wanting the blank section of moulding, caused a kind of stress state, reduce at shear stress under the situation of minimum level, this stress state has high as far as possible negative stress mean value s
m
Can be applicable to various types of continuous casting billet products by method of the present invention, as vertical continuous casting base or arc continuous casting base, and irrelevant with shape of cross section, that is to say that quadrangle, octagonal, polygon or circle can.The continuous casting billet of being produced is in distortion in advance not that is be cut under the as-cast condition and be heated to forming temperature after using length, sends into tubulation apparatus then.Confirmed already that particularly advantageous was to produce the seamless steel pipe method with push-bench rolling seamless steel pipe method with deep-draw press.In the method that all are mentioned, the pressing mold that the length that puts into production that is used for perforation process that has heated is inserted a circle in perforation procedure, is causing a negative stress mean value s as the front has been mentioned in the workpiece of moulding
mTherefore prevented the material fracture.But also can adopt other perforating apparatus and the operating room that does not seal for this reason, for example when continuous tube rolling or plug roll process, be placed in the taper cross roll roll piercing mill of front.But must be by selecting the location and the type of roll geometric parameter, guide rail, to guarantee also to form a stress state s here
m, wherein the share of tension is reduced to minimum degree, therefore no longer includes the danger that makes workpiece that fracture take place in perforation process.
Compare with material with the predeformation that tradition is used through diffusion annealing, adopt that direct continuous casting billet requirement is a kind of to be had the primary carbide of as far as possible equal even fine dispersion and high-purity is arranged and continuous casting billet that particle is thin as far as possible, guarantee these features by following illustrated smelting and casting process.High-purity needs, because the nonmetallic impurity that produces inevitably in the production process of steel, keeps the quantity of its original granularity and every mass unit, and until used as the preformed material that is pipe, they do not extend and change because of distortion.This situation also is applicable to medium size in the same way.Reduce that thick carbide is separated out and traditional so far diffusion annealing of giving up combines.Diffusion annealing is concentration and the assurance even structureization in order to adjust carbon in traditional method.
In order to produce a kind of continuous casting billet material that these features are arranged, as the measure regulation of taking, when the cast continuous casting billet, adopt metallurgy method through changing and special measure by the present invention as the raw material of tubulation apparatus.This is also comprised the poring rate that employing is suitable, for size range 170-240 millimeter, poring rate is preferably in 1.8-1.2 rice/minute scope.This poring rate smelt in conjunction with careful ladle and pans in sealing gland, refractory lining, MOLTEN STEEL FLOW and the special favourable design in aspects such as submersed nozzle, and the composition of the suitable steel relevant especially element al, S and O with pourability and purity
2, guaranteed desirable purity.Above-mentioned poring rate scope makes bubble and impurity be easy to rise to improve purity, does not influence desired fine granularity but should elect as.At cross section rapid solidification hour, just caused having high fine-grained tissue at as-cast condition, and meanwhile blocked separating out of thick carbide.Consider along cross section and see the distribution that to cool off equably and to consider segregation that the shape of circle should be favourable.But but can pour into a mould a kind of quadrangle, octagonal or polygonal of analogy in principle equally.The characteristics of special submersed nozzle are, for the corresponding structure height, and diameter≤25 millimeter.This plays a part favourable for molten iron static pressure and flow behavior when cast.
Material type for the rolling bearing steel is the special circumstances of hypereutectoid steel, and being given for the manufacturing rolling bearing should have a minimum sulfur content, so that can be without any the ring of difficulty ground machining hot-rolled pipe or cut-out.In order to improve purity, then in the steel the least possible sulphur should be arranged, but should have a MIN sulfur content for the machining of steel.The result confirms that with regard to this respect, sulfur content is preferably in the 0.008-0.015 mass percent scope.Different therewith, be chipless basically if continue processing, then sulfur content is up to 0.005 mass percent and thinks favourable.For two kinds of continuation processing types, that is machining or chipless processing, it is advantageous being preferably 1.45 in the scope of ratio between 1.35 to 1.52 of chromium carbon.Exceed this ratio, undesirable carbide streaky structure is certain to influenced.
In addition, for the fine granularity of oxygen content reduction and material, often require to have the aluminum content of least restrictive.Because do not allow to carry out habitual usually calcium processing to form liquid calcium aluminate, so aluminum content must be chosen as the Al that forms in the continuous casting billet of casting in order to improve purity for the rolling bearing steel
2O
3Amount seldom.Come from this reason, adding aluminium by cancellation in the method for the present invention, oxygen content can not reach undesirable value.Al is added in cancellation, and does not mean that the Al that does not have trace in motlten metal, and may be by the Al content of a spot of alloying component, or exists by masonry.
Further specify by method of the present invention by means of the example that picks out at random, promptly, on tubulation apparatus, use the distortion of best hypereutectoid steel and make the seamless axis of rolling without the continuous casting billet of diffusion annealing and be in the charge of, equipment has punch, in punch,, when perforation, form compressive stress state by selecting condition of molding.If for example should produce the hot-rolled pipe of a kind of rolling bearing steel 100Cr6, be of a size of 60.3,8 millimeters of wall thickness.The pig iron of producing from blast furnace makes sulfur content drop to scope less than 0.01 mass percent in the first road desulfurization process.By LD oxygen-blown converter the pig iron is blown into steel with capacity to 250 ton.No slag when entering in the teeming ladle, only add carbon, silicon, manganese and carry out alloy refining and combination deoxidation.Habitually in the past habitual add the way that aluminium carries out pre-deoxidation, come from the reason of having illustrated the front here and no longer adopt.Steel is subjected to further processing in this teeming ladle, that is refined alloy with satisfy the chemical composition limit predesignate, degasification comprises the carbon deoxidation and additionally carries out purity purge (Reinheitsgradsp ü len) with a kind of inert gas in a vacuum.Different with prior art, do not use ladle furnace in the method.Adjustment for the required temperature balance of the pouring temperature that keeps regulation guarantees by the big charge with corresponding enthalpy.On the arc continuous casting base equipment of multicore, then pour into diameter and be 220 millimeters circle.Poring rate is about 1.4 meters/minute.Pans are provided with dividing plate, are used to improve flow divert, and submersed nozzle preferably has diameter≤25 millimeter and long depositing funnel is arranged, and it remains full state.Whole casting space seals with argon gas, and motlten metal is without the hydrogen purge, so do not need stopper rod during cast.In order to control the flow behavior of hypereutectoid steel, adopt special dummy bar to pour into a mould.The feature that after cutting off the growth rod, has shown them, and inspection looks into defective, is transported to push-bench then and goes.Be cut to predetermined blank section long excellent the branch again on cold saw, and be heated to 1140-1180 ℃ in the swinging heating furnace, and in punch, the continuous casting billet of heating carries out being shaped to the first time hollow ingot, is of a size of 223.0 * 51.0 millimeters.This is equivalent to extend 1.39.Further extending at elongator hollow core base is 192.0 * 40.0 millimeters of sizes.This is equivalent to extend 1.43.Afterwards, this has the hollow ingot through extending at the bottom of to insert in the push-bench.By means of the bar of an insertion, hollow ingot is pushed over a plurality of rolling-mill housing, and elongation is 127.5 * 8.25 millimeters of sizes in this case.At this moment, extension is 6.18.Pull out bar and cut the bottom.To this operation realized that the front introduces once adding the moulding of pining for.In order to implement final moulding in stretch-reducing mill, chilled intervalve must reheat forming temperature.In stretch-reducing mill, do not having under the situation of horizontal core, be worked into that final finished is of a size of 60.3 * 8.0 millimeter wall and extension is 2.35.Carry out on traditional cold bed with the air cooling.Then, the hot-rolled pipe of so making after soft annealing as the charging of follow-up cold forming, the rolling or cold-drawn as the Pilger cold pilger mill.In automatic lathe, this cold working pipe is cut into ring, and is processed as the final overall size of rolling bearing.
Major advantage by the inventive method described above is, by high-carbon especially Hypereutectoid steel as pipe preformed material (semi-finished product) can be cancelled need so far preposition Rolling process or forging process and diffusion annealing, this continuous casting billet by no Al smelting and Adopt the pouring condition that has illustrated to have so a kind of tissue morphology, that is, it can directly use In tubulation apparatus, this tubulation apparatus preferably has one by the punch of its device design thought.
Claims (13)
1. produce the method for seamless hot-finished tube by the especially hypereutectoid steel of high-carbon, according to said method, liquid steel through preliminary treatment and degasification and deoxidation, on request chemical composition cast in continuous pouring, make the continuous casting billet rod that is divided into blank section stand once to be out of shape after cutting off continuous casting billet, it is characterized by: the continuous casting billet material is manufactured into high-purity, has thin carbide to separate out and high fine granularity; Blank section is without any predeformation that is at as-cast condition with do not heat-treat under the situation as diffusion annealing and be heated to forming temperature, and transport to tubulation apparatus, wherein, in the perforation process of whole operation parts as tubulation apparatus, form a kind of stress state in the blank section that will be out of shape, this stress state is reduced at shear stress under the situation of minimum level has a high as far as possible negative stress mean value s
m
2. according to the described method of claim 1, it is characterized by: tubulation apparatus has a punch.
3. according to the described method of claim 1, it is characterized by: use the mould of the blank section of packing in perforation process, it has the outer surface of sealing.
4. according to claim 1 or 3 described methods, it is characterized by: blank section has quadrangle or the common preferably circular cross section of polygon according to selecting.
5. according to the described method of claim 1, it is characterized by: used the unit with the especially taper cross roll roll piercing mill that does not seal the operating room in perforation process, blank section preferably has circular cross section in this case.
6. according to the described method of claim 1, it is characterized by: steel is cast for size in 170 millimeters to 450 millimeters scopes in circular continuous pouring, poring rate is that 170-240 millimeter poring rate is preferably in 1.8-1.2 rice/minute scope for size range in 1.8-0.6 rice/minute scope.
7. according to the described method of claim 1, it is characterized by: for the hypereutectoid steel of rolling bearing steel material type, at first only do not add aluminium by carbon, silicon and manganese carries out the part deoxidation to liquid steel, then in a vacuum by the thorough deoxidation of carbon.
8. according to the described method of claim 7, it is characterized by: continue under the situation of processing by cutting at hot-rolled pipe, its sulfur content continues in essentially no smear metal under the situation of processing in the scope of 0.008 to 0.015 mass percent, and sulfur content is up to 0.005 mass percent.
9. according to claim 7 or 8 described methods, it is characterized by: the chromium carbon ratio is chosen in the scope between 1.35 and 1.52.
10. according to the described method of claim 9, it is characterized by: the Cr/C ratio is 1.45.
11., it is characterized by: in when cast, in continuous casting billet equipment, use submersed nozzle, its diameter≤25 millimeter under the corresponding structure height, and the pans that use a band dividing plate according to claim 5 or 6 described methods.
12. according to the described method of claim 1, it is characterized by: tubulation apparatus is a kind of push-bench, and it has a forcing press as the perforation unit.
13. according to the described method of claim 1, it is characterized by: the production process of steel has the following step:
-manufacturing the pig iron
-desulfuration of foundry iron
-blowing operation: LO oxygen-blown converter
-ladle is discharged: additional element C, Si and Mn combination deoxidation, do not add aluminium
-ladle is handled without electric arc heated: degasification and carbon deoxidation under vacuum, refined alloy, purge
-on the arc continuous casting equipment, pour into circle, during cast without the argon purge.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4422011.1 | 1994-06-16 | ||
| DE4422011 | 1994-06-16 | ||
| DE19520833.1 | 1995-05-31 | ||
| DE19520833A DE19520833C2 (en) | 1994-06-16 | 1995-05-31 | Process for the production of a seamless hot-worked pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1150767A CN1150767A (en) | 1997-05-28 |
| CN1062785C true CN1062785C (en) | 2001-03-07 |
Family
ID=25937667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95193596A Expired - Fee Related CN1062785C (en) | 1994-06-16 | 1995-06-13 | Method of producing seamless hot-finished tube |
Country Status (11)
| Country | Link |
|---|---|
| EP (1) | EP0764063B1 (en) |
| JP (1) | JPH10505789A (en) |
| CN (1) | CN1062785C (en) |
| AT (1) | ATE176411T1 (en) |
| BR (1) | BR9508017A (en) |
| CA (1) | CA2192970A1 (en) |
| CZ (1) | CZ364496A3 (en) |
| ES (1) | ES2128736T3 (en) |
| PL (1) | PL178838B1 (en) |
| SK (1) | SK282573B6 (en) |
| WO (1) | WO1995034387A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100518989C (en) * | 2004-10-25 | 2009-07-29 | V&M德国有限公司 | Method for production of a seamless hot-finished steel tube and device for carrying out the method |
| WO2013086881A1 (en) * | 2011-12-12 | 2013-06-20 | Xie Zhaozong | Machining equipment and method for continuous metal casting |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19734563C1 (en) * | 1997-08-04 | 1998-12-03 | Mannesmann Ag | Steel bearing race production |
| CZ299495B6 (en) * | 2005-12-06 | 2008-08-13 | Comtes Fht, S. R. O. | Process for producing high-strength low-alloy steel pipes |
| CN102179681B (en) * | 2011-03-30 | 2012-10-17 | 盛泽能源技术有限公司 | Pipe mold manufacturing process adopting continuous-casting blank to forge and roll rough blank periodically |
| CN102366767B (en) * | 2011-10-10 | 2017-01-11 | 南通超力卷板机制造有限公司 | Production method of steel pipe |
| CN110328253A (en) * | 2019-08-14 | 2019-10-15 | 江阴华润制钢有限公司 | A kind of method for tandem rolling of composite bimetal pipe |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR366480A (en) * | 1905-06-29 | 1906-10-05 | Perrins Ltd | Method and apparatus for the manufacture of tubes |
| FR2511038A1 (en) * | 1981-08-06 | 1983-02-11 | Vallourec | PROCESS FOR PRODUCING SEMI-FINISHED STEEL PRODUCTS IN HARD STEELS USING A CONTINUOUS CASTING OPERATION |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB130059A (en) * | 1918-01-10 | 1919-07-31 | John Ernest Raworth | Improvements in Method of Forming Tubular Articles by Extrusion. |
| FR1075098A (en) * | 1953-02-28 | 1954-10-12 | Louvroil Montbard Aulnoye | Hot production process for seamless tubes |
-
1995
- 1995-06-13 CZ CZ963644A patent/CZ364496A3/en unknown
- 1995-06-13 BR BR9508017A patent/BR9508017A/en not_active IP Right Cessation
- 1995-06-13 AT AT95921715T patent/ATE176411T1/en not_active IP Right Cessation
- 1995-06-13 SK SK1597-96A patent/SK282573B6/en unknown
- 1995-06-13 EP EP95921715A patent/EP0764063B1/en not_active Expired - Lifetime
- 1995-06-13 PL PL95317837A patent/PL178838B1/en unknown
- 1995-06-13 CN CN95193596A patent/CN1062785C/en not_active Expired - Fee Related
- 1995-06-13 ES ES95921715T patent/ES2128736T3/en not_active Expired - Lifetime
- 1995-06-13 CA CA002192970A patent/CA2192970A1/en not_active Abandoned
- 1995-06-13 WO PCT/DE1995/000800 patent/WO1995034387A1/en not_active Application Discontinuation
- 1995-06-13 JP JP8501479A patent/JPH10505789A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR366480A (en) * | 1905-06-29 | 1906-10-05 | Perrins Ltd | Method and apparatus for the manufacture of tubes |
| FR2511038A1 (en) * | 1981-08-06 | 1983-02-11 | Vallourec | PROCESS FOR PRODUCING SEMI-FINISHED STEEL PRODUCTS IN HARD STEELS USING A CONTINUOUS CASTING OPERATION |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100518989C (en) * | 2004-10-25 | 2009-07-29 | V&M德国有限公司 | Method for production of a seamless hot-finished steel tube and device for carrying out the method |
| WO2013086881A1 (en) * | 2011-12-12 | 2013-06-20 | Xie Zhaozong | Machining equipment and method for continuous metal casting |
Also Published As
| Publication number | Publication date |
|---|---|
| PL317837A1 (en) | 1997-04-28 |
| CA2192970A1 (en) | 1995-12-21 |
| ATE176411T1 (en) | 1999-02-15 |
| CN1150767A (en) | 1997-05-28 |
| CZ364496A3 (en) | 1998-03-18 |
| JPH10505789A (en) | 1998-06-09 |
| EP0764063A1 (en) | 1997-03-26 |
| ES2128736T3 (en) | 1999-05-16 |
| EP0764063B1 (en) | 1999-02-03 |
| WO1995034387A1 (en) | 1995-12-21 |
| PL178838B1 (en) | 2000-06-30 |
| BR9508017A (en) | 1997-09-02 |
| MX9606085A (en) | 1998-05-31 |
| SK282573B6 (en) | 2002-10-08 |
| SK159796A3 (en) | 1997-06-04 |
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