CN1727509A - Austenitic nonmagnetic steel, and preparation method - Google Patents
Austenitic nonmagnetic steel, and preparation method Download PDFInfo
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Abstract
An unmagnetic austenite steel used to make the parts without magnetic conductivity in electric equipment contains Mn (20-26 Wt %), Cr (2-10), Al (1-4), C (0.18-0.24), RE (0.1-0.2), S (0-0.04), P (0-0.04) and Fe (rest).
Description
Technical field
The present invention relates to a kind of nonmagnetic steel, relate in particular to a kind of not nonmagnetic steel and preparation method thereof of magnetic conductive part of electric installation that is used for making.
Background technology
Along with China's development of electric power industry, carry electrical capacity significantly to increase, lead gold utensil catabiotic problems in the transmission of electricity process such as suspension clamp, strain clamp, stockbridge damper are caused people's attention gradually.Because above gold utensil is made with malleable iron and Q235 steel ferromagnetic substance.By exchange current, just form the magnetic loop of a closure on electric armour clamp in lead, ferromagnetic substance is remagnetization under action of alternating magnetic field, and the variation of its magnetic induction density always lags behind the variation (being hysteresis) of magneticstrength.In the process of remagnetization, because turning to repeatedly of magnetic domain, the molecular friction of ferromagnetic substance inside generates heat and causes energy waste, and the electric armour clamp of this formation loop line is in the remagnetization process, because magnetic domain turns to the power loss that causes repeatedly, be exactly so-called magnetic hysteresis loss.According to the law of electromagnetic induction, this alternating magnetic field also can produce inductive emf and induced current (being eddy current) in gold utensil inside, because the existence of ferrous materials resistance certainly leads to active power loss, i.e. eddy-current loss.According to Lenz's law and Faraday's electromagnetic indution law, the inductive emf that produces in gold utensil is directly proportional with the size of current of transmitting line, is directly proportional with the relativepermeability's of material size, is directly proportional with the thickness of gold utensil.The relative magnetic permeability of traditional malleable iron, Q235 steel electric armour clamp material is big, has the magnetic hysteresis vortex phenomenon, produces bigger magnetic hysteresis and eddy-current loss on transmitting line.
Chinese patent (publication number CN1094453) discloses a kind of wear and corrosion-resistant non-magnetic steel, this nonmagnetic steel is applicable to that ball grinding machine lining board and other require wear-and corrosion-resistant and non-magnetic occasion, but can't carry out machining or impact briquetting on punch press on the machine tool, its mechanical property and process industrial art performance all can't satisfy the requirement of making the transmitting line electric armour clamp.
Chinese patent (publication number CN1039268) discloses iron-manganese-aluminium-carbon austenitic nonmagnetic steel and low-temperature steel, is by Mn, C stable austenite structure, the new steel grade of this invention have extremely low magnetic permeability with in the high tenacity of 77K and above temperature thereof.New steel grade of the present invention can be used for the not manufacturings of magnetic conductive part of electric installation such as transformer, magnetic separator and motor as nonmagnetic steel.But this invention alloy corrosion resistance can be low, and only suitable manufacturing does not contact the parts of strong corrosive media, and simultaneously, this invention alloy yield strength is 60% of a 9%Ni steel only, so be not suitable for preparing the transmitting line electric armour clamp.
The very low temperature nonmagnetic steel that " Acta Metallurgica Sinica " the 19th volume the 4th phase " research of 30Mn23Al4Cr5 very low temperature nonmagnetic steel " discloses, but the high-temp plastic index instability of this very low temperature nonmagnetic steel, its temperature is lower than 850 ℃ and 1050 ℃～1200 ℃ scopes and is high plasticity, comprehensive plasticity index is low in 850 ℃～1050 ℃, present the plasticity low ebb, alloy is through forging the easy brittle rupture phenomenon of back product parts like this.The manufacturing of electric armour clamp part must become round steel and band steel to Steel Rolling, then mechanical workout or strike out the electric armour clamp part.In 850 ℃～1050 ℃ of the warm areas temperature that must use of rolling stock just, these steel produce inductile, and are influential to milling round steel and band steel, therefore the electric armour clamp manufacturing produced obstacle.
Summary of the invention
In order to solve above-mentioned technical barrier, it is good to the invention provides mechanical property and process industrial art performance, and magnetic permeability is low, and stability is good, and atmospheric corrosion resistance is good, the nonmagnetic steel that production cost is low.
Another object of the present invention provides the preparation method of above-mentioned nonmagnetic steel.
To achieve the above object, the present invention has adopted following technical scheme:
A kind of austenitic nonmagnetic steel contains manganese 20%～26% by weight percentage, chromium 2%～10%, and aluminium 1%～4%, carbon 0.18%～0.24%, rare earth element 0.1%～0.2%, sulphur≤0.04%, phosphorus≤0.04%, its surplus is an iron.
As preferably, the content of manganese is 20%～22% by weight percentage, and the content of chromium is 3%～4%, and the content of aluminium is 1%～1.5%, and the content of carbon is 0.2%～0.22%.
As preferably, this alloy also contains silicon 0.17%～0.37%.
As preferably, described rare earth element is one or more in lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, the yttrium.As preferred again, described rare earth element is a kind of in praseodymium and the neodymium or 2 kinds.
In order to reach another object of the present invention, the present invention has adopted following technical scheme:
A kind of preparation method of austenitic nonmagnetic steel, comprise following technology: prepare satisfactory alloy material, earlier iron and steel was melted in electric furnace 1～2 hour, when temperature reaches 1500 ℃～1550 ℃, add electrolytic manganese, chromium, aluminium and compound rare-earth element, when the metal temperature in the stove reaches 1600 ℃～1660 ℃, molten metal is removed the gred, deoxidation, fast casting, casting are finished and are cleared up after the back waits ingot casting to cool off.
As preferably, aluminium deoxidation is adopted in above-mentioned deoxidation.
As preferably, described electric furnace is an intermediate frequency coreless induction smelting furnace.
As preferably, the casting mold of casting adopts sodium silicate sand or quartz sand oven dry to be made.
The function analysis of main chemical compositions of the present invention is as follows:
(1) manganese, aluminium, chromium, manganese is main alloy element, enlarges the austenite phase region, the stable austenite tissue improves alloy strength.Carbon one regularly increases with manganese content, and organizing gradually of steel also further changes austenite into from the perlite to martensite, but the work hardening capacity of steel improves.Control the content of manganese well, can guarantee as cast condition austenite structure and stable austenite completely, make to occur through the suitable a large amount of strain-induced martensite of the distortion unlikely initiation in back.
Except deoxidation requires to add a spot of aluminium, aluminium element is non-carbide forming element, generally be evenly distributed on and hinder the diffusion of carbon atom in austenite in the matrix, stable carbide, easily make simultaneously austenite form ordered solid solution, strengthen the Chemical bond power of γ-Fe atom, making γ-Fe atom move activating force improves, strengthen austenitic stability, suppress γ in the Fe-Mn base alloy-ε transformation, this is extremely important to the magnetic permeability and the workhardness that cause owing to strain-induced martensite in the control course of processing.
Aluminium and chromium can improve the corrosion resistance of material, add aluminium or chromium in Fe-Mn base alloy, and the adding that can improve the atmospheric corrosion resistance, particularly chromium of material improves the corrosion resistance of material greatly.
(2) carbon, silicon, carbon had both promoted to form single-phase austenite structure, can make solution strengthening again, reduced the maximum permeability and the magnetic saturation of material.From the Fe-Mn binary phase diagram as can be known, have only manganese content quite high (surpassing 30%) Shi Caineng to obtain single-phase austenite during normal temperature.And add carbon in binary alloy after, the Fe-Mn-C ternary alloy of formation is containing when having an appointment 1.0% carbon, and the manganese add-on is as long as 9%～15% just can obtain single-phase austenite structure.But when carbon content was higher, carbide quantity increased in the as-cast structure, formed continuous and semicontinuous carbide network on austenite grain boundary, had weakened plasticity, the toughness of intergranular intensity and steel greatly, when serious even make the toughness of steel be reduced to zero.Though can make partially carbonized thing dissolve in austenite after solution treatment, the carbon content of invar is high and must improve the temperature of solution treatment or prolong heat treated soaking time.Take all factors into consideration the pros and cons of carbon, take suitably to improve carbon content, allow to have in the tissue a spot of carbide to exist, the add-on of manganese is reduced, and can be so that the austenitic stability that arrives improves.
But the silicon solid solution in austenite, solution strengthening.In steel, add a spot of silicon, improve the resistivity of material, to reduce eddy current.But silicon can reduce the solubleness of carbon in austenite, and when silicone content was high, carbide quantity in the as-cast structure increased, and silicon has the effect that impels large dendritic crystal to form when the high mangaenese steel crystallization, and makes the grain coarsening of steel, reduces the mechanical property of materials.Select carbon content 0.18%～0.24% in the test, silicone content is good 0.17%～0.37%.
(3) sulphur, phosphorus, sulphur, phosphorus are little to the effect of magnetic influence of cast steel in scope usually, but when content is higher, because a large amount of eutectiferous generations, magnetic permeability is increased, impurity such as the iron phosphide eutectic of Xing Chenging, sulfide can reduce material mechanical performance simultaneously, therefore should strictly control S≤0.04%, and P≤0.04% is advisable.
(4) compound rare-earth element, can crystal grain thinning, the refinement magnetic domain, reduce eddy-current loss, the compound rare-earth element has bigger segregation coefficient in Austenitic Manganese Steel, constitutional supercooling phenomenon in the time of can aggravating alloy graining, promote development, fusing, the free and propagation of dentrite, improve its crystallization nucleation rate, effectively refine austenite crystal grain.Because the internal adsorption effect of compound rare-earth element, hindered the diffusion of carbon atom, make and be difficult for forming carbide network on the austenite grain boundary, carbide quantity reduces on its crystal circle, carbide shape is a lumps, thus in the as-cast structure in the austenite carbon amount of solid solution increase relatively, and it is comparatively even to distribute, the density of microtexture increases, and microscopic defect reduces.Solve middle warm area and produced inductile technical barrier.
The performance and the effect of nonmagnetic steel of the present invention are as follows:
(1) electrician's performance: magnetic permeability≤1.5 μ H/m; Resistivity 〉=12M Ω/m.
(2) mechanical property: tensile strength reaches 800MPa; Yield strength reaches 675MPa; Unit elongation reaches 41%; Brinell hardness is less than 193HB.Every index all meets the regulation of GB/T2315-2000 " electric armour clamp nominal failure load series form size and bind mode ".
(3) metallographic structure: carbide of the present invention answers disperse to be distributed in the austenite structure, and the stability of material maintenance austenite structure in forming process and in the later military service process has prevented the generation strain-induced martensite as far as possible, avoids the rising of magnetic permeability.
(4) machinability: nonmagnetic steel of the present invention can carry out machining on machine tool, can impact briquetting on punch press, and good processability.
(5) Financial cost: above-mentioned nonmagnetic steel production cost is low, is 50% of aluminium alloy gold utensil cost, only improve 10% than original Q235 steel, and the raw material sources of steel is extensive, and production technique is simple.
Description of drawings
Fig. 1 is 200 times of metallographs of sample of embodiment 1;
Fig. 2 is the sample X diffraction analysis spectrum of embodiment 1;
Fig. 3, Fig. 4 are the structure iron of microstructure * 100 after the sample of embodiment 1 forges;
Fig. 5 is the X diffraction analysis spectrum after the sample of embodiment 1 forges.
Embodiment
Below in conjunction with accompanying drawing specific embodiments of the invention are made a detailed explanation.
Embodiment 1
The prescription of nonmagnetic steel is as follows: manganese 20%, and aluminium 1%, chromium 3%, carbon 0.2%, compound rare-earth element 0.1%, sulphur＜0.04%, phosphorus＜0.04%, compound rare-earth element are praseodymium and neodymium, its surplus is an iron.
Prepare above-mentioned alloy material.Earlier the Mn steel is melted in intermediate frequency coreless induction smelting furnace, furnace charge is of a size of φ more than 45, length is about 200mm, furnace charge will add in batches, general fusing time be 1.5～2 hours (specifically according to furnace charge what and different), when temperature reaches 1500 ℃, add electrolytic manganese, chromium, aluminium and compound rare-earth element, manganese metal should join in the molten metal as early as possible, prevents that manganese metal from contacting and scaling loss with air, thereby guarantees the composition of metal charge.At this moment be ready to casting mold, when the metal temperature in the stove reaches 1620 ℃, prepare casting, want before the casting earlier, and adopt 0.1% of aluminium weight in the above-mentioned prescription to carry out deoxidation the molten metal slagging-off.
Casting mold adopts sodium silicate sand or quartz sand oven dry to be made, and it is fast that the casting degree is wanted, and prevents the molten metal oxidation.After casting is finished, clear up after waiting ingot casting cooling.The scab epidermis is removed on rough turn ingot casting surface.Ingot casting is forged into test and makes the required specification of part, mainly is pole and band steel.
The above-mentioned alloy that makes is got 4 groups, carry out metallography microscope observation, X diffraction analysis, hardness test and mechanics tension test respectively, every performance is as follows:
1, mechanical property:
4 pulling force test specimen results such as table 1
Table 1 test specimen mechanical property
| The test specimen numbering | Tensile strength sigma n MPa | Yield strength σ S MPa | Unit elongation δ % | Brinell hardness HB |
| 1# | 794 | 659 | 41 | 197 |
| 2# | 789 | 650 | 40 | 190 |
| 3# | 805 | 692 | 41 | 192 |
| 4# | 812 | 699 | 42 | 194 |
| Mean value | 800 | 675 | 41 | 193.25 |
2, fabric analysis
Can observe from metallograph, tissue is based on austenite, and (the X diffraction can not be strafed the phase peak of this thing to a spot of carbide less than 2% phase to content, so in diffraction spectra, do not have the peak of carbide), austenite structure is polytropy, and crystal boundary is clear, and distribution of carbides is at crystal boundary and intragranular.Based on austenitic (111), (200) main peak, still there is a spot of ferrite peak (110) in the X diffraction spectra.More than explanation, the composition of sample has reached the austenite structure requirement substantially.See Fig. 1, Fig. 2.
3, the microstructure and property after the forging
Electric armour clamp is as a kind of structural part, must when steel are produced in batches in steel mill, can shut out band steel and round steel through punching press, mechanical workout by rolling mill, can be reprocessed into part, so the quality of the performance of material after forging will determine carry out mechanical workout.
4 groups of above-mentioned samples have been carried out forging processing, and plant and instrument identical when being used in as cast condition has then carried out measurement of hardness, microstructure observation and X-ray diffraction analysis to the sample after forging.See Table 2, Fig. 3, Fig. 4, Fig. 5.
The comparison of hardness value before and after table 2 sample forges
| Type | Under the as cast condition | After the forging |
| Impression diameter/mm | 4.7 | 4.1 |
| Hardness value/HBS | 163 | 220 |
From above-mentioned table 2, Fig. 3, Fig. 4 are as can be seen, sample is being broken through forging the back austenite grain boundary, austenitic matrix after the forging is strip and distributes, and it is fine and close more that tissue becomes, so hardness increases to some extent, but it is different with common high mangaenese steel, tangible work hardening does not take place in the forging deformation process, so the hardness value after forging is 220HB, the machinability of material is still more satisfactory.We are with forged pole, get on the bus into φ 12 round steel at engine lathe C620, and choose the screw thread (round steel length 154mm, the long 30mm of screw thread) of M12 at two ends, there has not been any problem, sensory surface has sclerosis, after car goes about 1mm, smear metal web-like continuously, hardness is just low, and can bend to U type screw by the double threaded screw that car is intact, forged band steel blank is processed into 6 * 40 section at end mill earlier with milling cutter, use the 125T punch press then, circle of contact primary drying hole, die mould becomes link plate, makes the nonmagnetic steel part and is assembled into suspension clamp, after whole forging, after machining and the punching press, the situation of magnetic permeability does not all take place to increase, processing characteristics is good substantially.
X ray diffracting spectrum before and after forge more as can be seen, the ε martensite that forges in the tissue of back increases, this also is the reason that causes material hardness to rise.
To sum up analyze, sample has kept the austenite structure under the as cast condition substantially after forging, and hardness increases to some extent.
Embodiment 2
The prescription of nonmagnetic steel is as follows: manganese 22%, and chromium 3%, aluminium 1.5%, carbon 0.21%, compound rare-earth element 0.2%, sulphur＜0.04%, phosphorus＜0.04%, its surplus is an iron.
The preparation method of nonmagnetic steel such as embodiment 1.
Embodiment 3
The prescription of nonmagnetic steel is as follows: manganese 22%, and chromium 3%, aluminium 1.5%, carbon 0.19%, compound rare-earth element 0.2%, sulphur＜0.04%, phosphorus＜0.04%, its surplus is an iron.
The preparation method of nonmagnetic steel such as embodiment 1.
Embodiment 4
The prescription of nonmagnetic steel is as follows: manganese 20%, and chromium 3%, aluminium 1.5%, carbon 0.21%, compound rare-earth element 0.2%, sulphur＜0.04%, phosphorus＜0.04%, its surplus is an iron.
The preparation method of nonmagnetic steel such as embodiment 1.
Claims (9)
1. an austenitic nonmagnetic steel is characterized in that this nonmagnetic steel contains manganese 20%～26% by weight percentage, chromium 2%～10%, aluminium 1%～4%, carbon 0.18%～0.24%, rare earth element 0.1%～0.2%, sulphur≤0.04%, phosphorus≤0.04%, its surplus is an iron.
2. a kind of austenitic nonmagnetic steel as claimed in claim 1 is characterized in that the content of manganese is 20%～22% by weight percentage, and the content of chromium is 3%～4%, and the content of aluminium is 1%～1.5%, and the content of carbon is 0.2%～0.22%.
3. a kind of austenitic nonmagnetic steel as claimed in claim 1 or 2 is characterized in that this alloy also contains silicon 0.17%～0.37%.
4. a kind of austenitic nonmagnetic steel as claimed in claim 1 or 2 is characterized in that described compound rare-earth element is one or more in lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, the yttrium.
5. a kind of austenitic nonmagnetic steel as claimed in claim 4 is characterized in that described compound rare-earth element is a kind of in praseodymium and the neodymium or 2 kinds.
6. the preparation method of a kind of austenitic nonmagnetic steel as claimed in claim 1, it is characterized in that this preparation method comprises following technology: prepare satisfactory alloy material, earlier iron and steel was melted in electric furnace 1～2 hour, when temperature reaches 1500 ℃～1550 ℃, add electrolytic manganese, chromium, aluminium and compound rare-earth element, when the metal temperature in the stove reaches 1600 ℃～1660 ℃, molten metal is removed the gred, deoxidation, fast casting, casting are finished and are cleared up after the back waits steel to cool off.
7. the preparation method of a kind of austenitic nonmagnetic steel as claimed in claim 6 is characterized in that described deoxidation employing aluminium deoxidation.
8. as the preparation method of claim 6 or 7 described a kind of austenitic nonmagnetic steels, it is characterized in that described electric furnace is an intermediate frequency coreless induction smelting furnace.
9. as the preparation method of claim 6 or 7 described a kind of austenitic nonmagnetic steels, it is characterized in that the casting mold of casting adopts sodium silicate sand or quartz sand oven dry to be made.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101736122B (en) * | 2010-01-12 | 2011-07-20 | 山西太钢不锈钢股份有限公司 | Method for improving recovery rate of smelt nonmagnetic steel aluminum |
| CN106048208A (en) * | 2016-08-12 | 2016-10-26 | 武汉钢铁股份有限公司 | Fe-Mn austenite non-magnetic steel forging method |
| CN109402501A (en) * | 2018-10-19 | 2019-03-01 | 全球能源互联网研究院有限公司 | A kind of high-fatigue strength nonmagnetic steel and preparation method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6336758A (en) * | 1986-07-30 | 1988-02-17 | Yanagiya:Kk | Formation of hollow fish paste product |
| CN1042949A (en) * | 1988-11-21 | 1990-06-13 | 大连铁道学院 | Iron-manganese-chromium-aluminium-expanding alloy determined by antiferromagnetism of Fe-Mn-Cr-Al-C series |
| JPH0317245A (en) * | 1989-06-13 | 1991-01-25 | Nippon Koshuha Kogyo Kk | High strength non-magnetic stainless steel having excellent machinability |
| CN1038353C (en) * | 1993-09-11 | 1998-05-13 | 中国科学院金属研究所 | Steel for high-strength non-magnetic drill collar |
| CN1029323C (en) * | 1993-12-31 | 1995-07-12 | 孙桂华 | Austenite nonmagnetic stainless steel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101736122B (en) * | 2010-01-12 | 2011-07-20 | 山西太钢不锈钢股份有限公司 | Method for improving recovery rate of smelt nonmagnetic steel aluminum |
| CN106048208A (en) * | 2016-08-12 | 2016-10-26 | 武汉钢铁股份有限公司 | Fe-Mn austenite non-magnetic steel forging method |
| CN109402501A (en) * | 2018-10-19 | 2019-03-01 | 全球能源互联网研究院有限公司 | A kind of high-fatigue strength nonmagnetic steel and preparation method thereof |
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