CN1284867C - Method for making magnet-free stainless steel through screw stem - Google Patents
Method for making magnet-free stainless steel through screw stem Download PDFInfo
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- CN1284867C CN1284867C CN 200410018498 CN200410018498A CN1284867C CN 1284867 C CN1284867 C CN 1284867C CN 200410018498 CN200410018498 CN 200410018498 CN 200410018498 A CN200410018498 A CN 200410018498A CN 1284867 C CN1284867 C CN 1284867C
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Abstract
The present invention relates to the metallurgy class, particularly to a method for manufacturing a non-magnet stainless steel penetrating screw rod which mainly comprises a smelting and manufacturing process for non-magnet stainless steel bar steel ingots, a forging, rolling and cold drawing process for a steel bar, and a heat treatment and machine work process for the steel bar, wherein in the smelting and manufacturing process of the non-magnet stainless steel bar steel ingots, rare-earth high-position double deoxidizer needs to be added in the oxidation period and the reduction period of the steel smelting process; in the heat treatment and machine work process for the steel bar, a plurality of guide rolls are adopted for guiding and supporting the steel bar so that the steel bar can be fed horizontally, and the peeling and the finishing work are carried out by a method of the rotary cutting of a cutter. The present invention has the advantages of good product quality, low cost, easy manufacturing method, simple equipment and little investment.
Description
Technical field
The present invention relates to metallurgical class, particularly a kind of manufacture method of magnetism-free stainless steel core through screw rod.
Background technology
The production of non-magnetic rustproof steel adopts general stainless steel art, method to can not produce this kind material international and domesticly all do not have a standard, and along with development of modern science and technology, the electric power power of the assembling unit is also increasing, and rotating speed is also more and more higher.In order to reduce eddy losses, domestic and international power industry all presses for a kind of diamagneticization novel material and replaces existing product.
Core through screw rod is used for the fixedly framework of silieonized plate of rotor of steam turbo generator, if make of common stainless steel or low magnetic steel material, can produce eddy current when rotor rotates, and consumed power, so the core through screw rod material must be no magnetic, preferably super no magnetic.
There are two hang-ups in the production of magnetism-free stainless steel core through screw rod, and the first requires no magnetic, and is high especially to the material requirement, must be high cleanliness, high homogeneous, superfine crystal particle, the pure austenite of high nitrogen (N); It two is the processing of slender type screw rod, as 600,000 kilowatts of turbine driven set magnetism-free stainless steel core through screw rod, and φ 31.75 * 7015 its technical requirement intensity σ
b〉=760Mpa, magnetic permeability μ≤1.02, roughness Ra≤3.2 μ m utilizes that existing stainless material all can't satisfy its requirement on the market.
Summary of the invention
The objective of the invention is according to above-mentioned the deficiencies in the prior art part, a kind of manufacture method of magnetism-free stainless steel core through screw rod is provided, this manufacture method is with high manganese Mn, high chromium Cr and high nitrogen N material organic assembling, make its molten steel ultra-pure purification, high homogeneous, superfine crystal particle, the pure austenitizing of high nitrogen (N) simultaneously, simultaneously in last mechanical workout, adopt many deflector roll guiding and support, by the knife rotation is that whirling adds that no stamen grinds, and has fundamentally solved the difficult problem of the bright as silver processing of flexible slender axles.
The object of the invention realizes being finished by following technical scheme:
The manufacture method that the present invention relates to mainly comprises the smelting manufacturing processed of nonmagnetic stainless steel bar steel ingot, the rolling Cold Drawing Process of forging of rod iron, the thermal treatment and the machining process of rod iron, it is characterized in that in the smelting manufacturing processed of nonmagnetic stainless steel bar steel ingot, oxidation period and reduction period in steel-making need add composite deoxidant, and the composition of this composite deoxidant is: C≤0.5%, Mn 18-22%, Si 8-12%, Al 4-5%, Ca 3-5%, all the other are Fe; In the alloying process of steel-making, when adding N in furnace charge, what added is the nitrogenize material, and its method is that the nitrogenize material is packed in the small iron box, utilizes the small iron box deadweight that the nitrogenize material is sunk to furnace bottom; After cast, add a cover rare earth spontaneous combustion exothermic riser, its composition is: aluminium powder 14-16%, ferrosilicon powder 18-22%, silicon calcium powder 14-16%, manganese oxide 14-16%, ferric oxide 19-21%, carbon dust 9-11%, all the other compositions are the aluminium vanadine.
In the rolling Cold Drawing Process of the forging of rod iron,, forge into rod iron with steel ingot warm forging and cold-drawn, cold deformation.Heating temperature wherein is 1120 ℃-1140 ℃, and soaking time is 1.5-2.5 hour, and adopts forging ratio 〉=5.5-7 to carry out the warm forging cold deformation and handle, and its cold deformation amount generally is controlled at 10-12%, is controlled at 12% for best.
In the thermal treatment and machining process of rod iron, adopt many deflector roll guiding after the thermal treatment and support rod iron, make its translation feeding, the method for bite rotary cutting is carried out the processing of peeling and grinding and polishing.
Rod iron herein is the magnetism-free stainless steel core through screw rod.
Advantage of the present invention is, good product quality, cost are low, and manufacture method is simple, and equipment is simple, less investment.
Description of drawings
Accompanying drawing 1 is multiple tracks wheel scaling machine synoptic diagram;
Accompanying drawing 2 is multiple tracks wheel lapping machine synoptic diagram;
Accompanying drawing 3 is placed on end view on the deflector roll for workpiece;
Embodiment
Feature of the present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that technician's of the same trade understanding:
Embodiment:
As Figure 1-3, sequence number 1-19 represents respectively among the figure: deflector roll (1), travelling belt (2), guide pin bushing (3), cross beaming roller (4), bite (5), knife rest (6), discharge pedestal (7), bed cabinet (8), guiding group (9), feeding table (10), core through screw rod rod iron (11), charging carrying roller group (12), corase grind wheels (13), fine grinding wheels (14), workpiece groove (15), discharging carrying roller group (16), fine grinding location wheels (17), corase grind location wheels (18), by grinding work-piece (19).
The manufacture method of present embodiment mainly comprises the smelting manufacturing processed of nonmagnetic stainless steel bar steel ingot, the rolling Cold Drawing Process of forging of rod iron, thermal treatment and three processes of machining process of rod iron.
Smelting manufacturing processed at the rod iron steel ingot comprises: selected furnace charge → furnace charge clean → oven dry removal of impurity, remove water vapour → burner hearth, steamed stuffed bun purifying treatment → shove charge → melting → oxidation → add composite deoxidant → deslagging is removed inclusion → reduction secondary and is added composite deoxidant → deslagging removing residual impurity → refining → adjustment composition → deadweight caisson and add the N → adjustment composition → cast of coming out of the stove → baking ingot mold → pour into a mould → add a cover at the bottom of spontaneous combustion exothermic riser → demoulding → trimming steel ingot → whole body polishing → excision rising head and the ingot.In this process, obtain the material of high strength, good material, the more important thing is that its magnetic permeability is low, magnetic permeability μ≤1.02.
Wherein at steel-making oxidation period and reduction period, for making steel pure, add composite deoxidant, the large inclusions come-up of its formation is absorbed by slag, the composition of this composite deoxidant is: C≤0.45%, Mn 20%, Si 9%, Al 4.5%, Ca 4%, all the other are Fe.
In alloying process, usually need add N, generally be to add nitrogen, and magnetism-free stainless steel is very responsive to gas, so can not use nitrogen, nitrogen can only be become compound, be that roasting becomes nitrided ferro-chromium or nitrogenize ferromanganese, its form is Fe-Cr-N or Fe-Mn-N, and it is many using the former usually, and this compounds is very light, will swim in the molten steel surface, very inhomogeneous, adopt the deadweight caisson to add N, in the small iron box of earlier nitrided ferro-chromium or nitrogenize ferromanganese being packed into for this reason, utilize the small iron box deadweight that nitrided ferro-chromium or nitrogenize ferromanganese are sunk to furnace bottom, by stirring, ladle-to-ladle technology reaches high N, evenly, make and contain N amount and reach 0.3-0.35%.Should make the abundant deoxidation of molten steel guaranteeing entering of high nitrogen amount before nitride adds, otherwise [H] [O] can repel entering of N in the molten steel.
After the cast of coming out of the stove, add a cover the spontaneous combustion exothermic riser, its composition is: aluminium powder 5%, ferrosilicon powder 15%, silicon calcium powder 10%, manganese oxide 10%, ferric oxide 15%, carbon dust 10%, all the other compositions are the aluminium vanadine, its effect is that the high temperature spontaneous combustion exhausts gas in the ingot mold when watering steel, again steel ingot is sealed and isolate from outer air, do not contact, when avoiding the steel ingot cooling, from atmosphere, suck gas, steel ingot insulation slow cooling is homogenized, and high can the generation of nitrogen content overflowed in the molten steel in addition, add a cover sealing after, can produce certain pressure, it is dissolved in again.
The rolling Cold Drawing Process of the forging of rod iron: be heated to 1050 ℃ → insulation 5-6 hour → pre-hot iron and upset → be warming up to 1250 ℃, be incubated 1-5 hour, high temperature forging moulding → be cooled to 650 ℃-750 ℃, warm forging cold deformation, refinement particle, improve intensity, forge into the rod iron of size typing.Wherein, during high temperature forging, strengthen forging ratio 〉=3.5, and adopt forging ratio K 〉=5.5-7 to carry out deformation process, the cold deformation amount is controlled at 12%.
The thermal treatment and the machining process of rod iron comprise: the bright as silver processing → alignment of shove charge → heating → insulation → water quick cooling → precision work → alignment → peeling → solid solution → cold-drawn → de-stress → centreless grinding → crop → packing shipping.In this process,, therefore used conversion unit because of flexible slender axles engine lathe can't be processed, with many deflector roll guiding and supporting workpiece is rod iron, makes workpiece translational motion, makes the bite rotary cutting, by using different cutting tools, finish the peeling and the milled processed of workpiece.
In the apparatus for peeling off, workpiece is by the two location of guide pin bushing (3), by cross beaming roller (4) workpiece (11) is advanced, after entering knife rest (6), bite (5) cuts, it is core through screw rod rod iron (11) turnover that feeding table (10) makes workpiece with discharge pedestal (7) by motor drive deflector roll (1), what deflector roll (1) adopted is tapered roller, and workpiece (11) enters into the cone tank feeding that is made of two deflector rolls, selects 1500-2000 rev/min of deflector roll rotating speed in the present embodiment, push-in stroke 8mm/ second, cutting output is workpiece single face 0.4-0.7mm, generally selects 0.4-0.6mm for use, owing to adopt two guide pin bushings to carry out two location, degree of eccentricity is at 0.3mm, and the cutting size is very stable.
In the milling apparatus, include six road emery wheels, first three road is corase grind, generally select emery cloth for use 0,1, No. 2, three roads, back are fine grinding, general 00 emery cloth of using,, ground by emery wheel group (13) (14) and locating wheel (18) (17) combination with charging carrying roller group (12) charging by grinding work-piece (19), advancing of workpiece (19) is to be pushed ahead by orientation angle by locating wheel and emery wheel, every locating wheel can be upper and lower moving partially, grind with control, do not advance during level, just push ahead after the skew, after workpiece grinds, by discharging carrying roller (16) discharging.
Usually always have many impurity, inclusion in the molten steel in steel making, but very responsive to inclusion, gas because of the magnetic line of force relation to magnetism-free stainless steel, inclusion, gas are many more, and magnetic permeability is also just poor more.So for no magnetic, do not allow inclusion and gas and exist, therefore in the smelting manufacturing processed of rod iron steel ingot, at first to carry out purifying treatment to stove, steamed stuffed bun, in addition to alloy, furnace charge except that purify handle, also to dry, reduce impurity and gas.The composite deoxidant and oxygen, sulphur formation compound slag that add design voluntarily in the molten steel oxidation phase, impurity in the molten steel, inclusion, air scavenge is clean by repeatedly stirring, harrow slag, make molten steel reach high cleanliness, high homogeneous.Add N before the tapping, N is what be difficult to be added, be mixed with the CrN compound, adds N with the iron case precipitator method of conducting oneself with dignity, and ladle-to-ladle twice, makes it even.When forging, it is stressed to use multiple contact, uses loose tooling forging as far as possible, prevents owing to high Mn, high Cr, high N form forging crack, carries out warm forging, cryogenic forging in addition, makes its cold-working viscous deformation, improves the intensity effect to reach crystal grain thinning.
Claims (8)
1, a kind of manufacture method of magnetism-free stainless steel core through screw rod, mainly comprise the smelting manufacturing of nonmagnetic stainless steel bar steel ingot, the forging of rod iron, the thermal treatment and the machining of rod iron, it is characterized in that in the smelting manufacturing processed of rod iron steel ingot, oxidation period and reduction period in steel-making add composite deoxidant respectively, and the composition of this composite deoxidant is: C≤0.5%, Mn 18-22%, Si 8-12%, Al 4-5%, Ca 3-5%, all the other are Fe.
2, the manufacture method of a kind of magnetism-free stainless steel core through screw rod according to claim 1, it is characterized in that in the smelting manufacturing processed of rod iron steel ingot, the composite deoxidant that adds in oxidation period of steel-making and reduction period, its composition is: C≤0.45%, Mn 20%, Si 9%, Al 4.5%, Ca 4%, all the other are Fe.
3, the manufacture method of a kind of magnetism-free stainless steel core through screw rod according to claim 1, it is characterized in that in the smelting manufacturing processed of rod iron steel ingot, in alloying period, when in furnace charge, adding N, what added is the nitrogenize material, method is that the nitrogenize material is packed in the small iron box, utilizes the small iron box deadweight that the nitrogenize material is sunk to furnace bottom.
4, the manufacture method of a kind of magnetism-free stainless steel core through screw rod according to claim 3 is characterized in that described nitrogenize material is nitrided ferro-chromium or nitrogenize ferromanganese.
5, the manufacture method of a kind of magnetism-free stainless steel core through screw rod according to claim 1, it is characterized in that in the smelting manufacturing processed of rod iron steel ingot, after cast, need add a cover the spontaneous combustion exothermic riser, its composition is: aluminium powder 5%, ferrosilicon powder 15%, silicon calcium powder 10%, manganese oxide 10%, ferric oxide 15%, carbon dust 10%, all the other compositions are the aluminium vanadine.
6, the manufacture method of a kind of magnetism-free stainless steel core through screw rod according to claim 1 is characterized in that in the forging process of rod iron its cold deformation amount is 10-12%.
7, the manufacture method of a kind of magnetism-free stainless steel core through screw rod according to claim 1, it is characterized in that in the thermal treatment and machining process of rod iron, peeling adds to be adopted many guide wheel guiding man-hour and supports rod iron, make its translation feeding, and adopt the method for bite rotary cutting to carry out peeling processing.
8, the manufacture method of a kind of magnetism-free stainless steel core through screw rod according to claim 1, it is characterized in that in the thermal treatment and machining process of rod iron, grinding and polishing adopts many guide wheel guiding and supports rod iron when handling, make its translation feeding, push ahead by orientation angle by locating wheel and emery wheel, realize grinding.
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| CN 200410018498 CN1284867C (en) | 2004-05-20 | 2004-05-20 | Method for making magnet-free stainless steel through screw stem |
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| CN 200410018498 CN1284867C (en) | 2004-05-20 | 2004-05-20 | Method for making magnet-free stainless steel through screw stem |
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| CN1284867C true CN1284867C (en) | 2006-11-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101787414A (en) * | 2010-04-07 | 2010-07-28 | 曹承 | Complex deoxidizer for steelmaking and preparation method thereof |
| CN101899603B (en) * | 2009-06-01 | 2012-05-23 | 上海申江锻造有限公司 | Method for preparing stainless steel |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102554570B (en) * | 2011-12-31 | 2014-04-16 | 上海加宁新技术研究所 | Manufacturing method for non-magnetic stainless steel adapter lug |
| CN103372756B (en) * | 2012-04-23 | 2016-08-03 | 上海申江锻造有限公司 | A kind of manufacture method of low carbon austenite non-magnetic steel motor support drum forging |
| CN105441780B (en) * | 2015-11-25 | 2018-01-02 | 上海加宁新技术研究所 | The manufacture method of the nonmagnetic retaining rings of big motor 1Mn18Cr18N |
-
2004
- 2004-05-20 CN CN 200410018498 patent/CN1284867C/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101899603B (en) * | 2009-06-01 | 2012-05-23 | 上海申江锻造有限公司 | Method for preparing stainless steel |
| CN101787414A (en) * | 2010-04-07 | 2010-07-28 | 曹承 | Complex deoxidizer for steelmaking and preparation method thereof |
| CN101787414B (en) * | 2010-04-07 | 2012-05-30 | 曹承 | Complex deoxidizer for steelmaking and preparation method thereof |
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| Publication number | Publication date |
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| CN1580587A (en) | 2005-02-16 |
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