CN102747273A - High-manganese non-magnetic steel containing niobium and preparation method thereof - Google Patents
High-manganese non-magnetic steel containing niobium and preparation method thereof Download PDFInfo
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- CN102747273A CN102747273A CN201210222982XA CN201210222982A CN102747273A CN 102747273 A CN102747273 A CN 102747273A CN 201210222982X A CN201210222982X A CN 201210222982XA CN 201210222982 A CN201210222982 A CN 201210222982A CN 102747273 A CN102747273 A CN 102747273A
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Abstract
A high-manganese non-magnetic steel containing niobium and a preparation method thereof belong to the technical field of non-magnetic steel production. Components of the high-manganese non-magnetic steel containing niobium comprises, by mass percent, 10 to 15 % of Mn, 0.8 to 1.2 % of C, 0.3 to 0.5 % of Si, less than 0.008 % of P, less than 0.005 % of S, 0.01 to 0.02 % of Nb, and the balance being Fe. The preparation method comprises steps of smelting, forging, hot rolling, water toughening, and water quenching after the hot-rolled plate is kept in a heating furnace for 15 minutes at 1000 DEG C. The method is advantageous in that the high manganese steel is pre-deformed by using a rolling method, thereby being capable of refining grain size and improving organization and performance, and a finished product has tensile strength of 900 to 1100 MPa, elongation percentage of 50 to 60%, Rockwell hardness of 15 to 22 HRC and magnetic permeability of less than 1.0002. According to the invention, the non-magnetic steel is superior in magnetic, mechanical and processing properties, and the method is simple in production, low in economic cost, and is applicable in the fields of mechanical production and transportation, such as nonmagnetic structural members and nonmagnetic molds used for magnetic shielding in large and medium-sized transformer oil tanks, train tracks, etc.
Description
Technical field
The invention belongs to the nonmagnetic steel production technical field; Particularly relate to a kind of no magnetic that is used for making; H.T.; The high strength structure part, it is applicable to structural part such as electrical structure spares such as big-and-middle-sized oil tank of transformer inner magnetic screen, lifting electromagnet sucker, magnetic plant are simplified, tramp iron separator, special electric furnace liner.
Background technology:
The nonmagnetic steel material comprises two types of austenitic stainless steel and Ovshinsky height manganese nonmagnetic steels.Wherein structural part is used nonmagnetic steel, adopts Fe-C-Mn system basically, through the tough processing of water, obtains uniform austenite structure.
The purposes of nonmagnetic steel is very extensive; At automatic control system, precision meter, telecommunication and motor; And all need adopt nonmagnetic steel in many military fields; The used structured material of track of the superexpress linear motor train of especially large-scale nuclear fusion device and electromagnetic levitation type, nonmagnetic steel is absolutely necessary.The magnetic permeability of these materials is lower, otherwise will magneticinterfering field, produces eddy current, not only causes the loss of energy, also makes structural part itself produce danger easily.Along with science and technology and The development in society and economy, these fields are increasing to the demand of nonmagnetic steel, and propose many new requirements, for example require the ability of HS, high firmness and high-wear resistance and good anti-various dielectric corrosions.
Along with electric, the machinery manufacturing industry specialized trend to material, in relating to high-intensity magnetic field product manufacturing field, stainless steel is withdrawing from no magnetic field of materials as substitute; And nonmagnetic steel is progressively got back to its original position, the essential material that become and reduce power consumption, reduces manufacturing cost.
As everyone knows, Austenitic Manganese Steel forging process performance is poor, the mechanical workout difficulty, has limited the use of high mangaenese steel to a certain extent.For improving the processing characteristics that Fe-Mn is a nonmagnetic steel, domesticly carry out many research work, for example in steel, add Al and improve the machining property of steel, and obtain good effect.Al to be improving the machining property of steel, and obtains good effect.Two steel grades of 45Mnl7A13MovN and 40Mnl4Cr2A13MoV are 10～12HRC through its hardness after 1100～1130 ℃ of solution treatment, and magnetic permeability is 1.2639 * 10
-6H/m.
The nonmagnetic steel that structural part is commonly used does not adopt strong carbide forming element to strengthen basically, and its thermal treatment process adopts the tough processing of water usually, obtains single austenite structure, can obtain higher intensity and toughness, so that satisfy request for utilization.Along with progress of science and technology, many new requirements are arranged in a lot of fields, for example there is not the nonmagnetic steel that mill train that magnetic mould, electron beam exposure machine use etc. all needs HS, high firmness.The ultimate principle of high strength and high hardness nonmagnetic steel is in nonmagnetic steel, to add people's intensive carbide forming element; For example niobium, vanadium, molybdenum, tungsten, chromium etc.; Through the tough processing of water carbide is dissolved in the austenite, separates out through the ageing treatment disperse again, reach the purpose that improves intensity and hardness.
Summary of the invention
The object of the present invention is to provide a kind of rolling high manganese nonmagnetic steel of niobium and method of manufacture of containing; This invention overcomes prior art problems, adopts rolling method and adds the niobium element, carries out strain hardening in advance and handles; Suppressing carbide separates out; Improve the mechanical property of nonmagnetic steel greatly, magnetic permeability is low, and production cost is low.
Another object of the present invention provides the preparation method of above-mentioned nonmagnetic steel.
A kind of rolling high manganese nonmagnetic steel of niobium method of manufacture that contains; It is characterized in that containing niobium austenitic nonmagnetic steel composition quality per-cent is: Mn:10%～15%, C:0.8%～1.2%, Si:0.3%～0.5%, P: 0.008%, S: 0.005%, Nb:0.01%～0.02%, all the other are Fe and unavoidable impurities.Preparation process is following:
A. smelt, pour into a mould: adopt electromagnetic induction furnace vacuum melting, the applying argon gas protection is cast into slab; Perhaps smelt, pour into a mould continuous casting and become strand;
B. hot rolling technology: hot rolling finishing temperature is 900 ℃, obtains hot rolling blank;
C. thermal treatment process: the tough treatment temp of hot rolling blank water is 1000 ℃, insulation 15min, shrend.
The function analysis of main chemical compositions of the present invention is following:
(1) effect of Mn
Mn enlarges the austenitic area and makes the stable element of austenite strongly.Carbon content one regularly along with the organizing gradually of increase steel of manganese content changed into martensite type and further transferred to Austenitic by pearlite type, can not decompose the austenite that at high temperature forms in process of cooling in steel.The most of solid solution of manganese forms and subrogates formula sosoloid in austenite, and matrix is strengthened.Help austenitic formation, but enlarged the rate of cooling of practical application, for the industriallization actual production is laid a good foundation.In addition, manganese can also improve the intensity aggregate level of steel through solution strengthening.Manganese content is in 14% the time, and along with the increase of manganese amount, strong plasticity improves.
(2) effect of C
Carbon is present in the steel with the form of interstitial atom, is pinning and the principal element that hinders dislocation glide.Carbon has two significantly effects in high mangaenese steel, and the one, promote single-phase austenite structure; The 2nd, solution strengthening is to guarantee high mechanical property.C and Mn content not simultaneously, with forming different tissues.Say that from microcosmic angle carbon content is relevant as solute atoms and interaction of dislocation with carbon with relation between intensity and the plasticity.
The carbon content that improves in the steel can promote carbon and carbide forming element in the steel to form carbide jointly, through the tough processing of water carbide dispersion is separated out, thereby improves the intensity and the hardness of steel, but has also reduced the plasticity and the toughness of steel simultaneously.
(3) effect of Nb
Niobium is that most typical microalloy element and carbon, nitrogen, oxygen have very strong avidity.Niobium ability crystal grain thinning produces the to a certain degree precipitation strength of niobide, hinders carbon diffusion and carbide and assembles, and when improving intensity, improves the toughness of steel.Niobium can significantly reduce the fault probability in addition, improves the stacking fault energy of steel, helps the generation of mechanical twin and TWIP effect, thereby has good plasticity.
Can obtain stable austenite structure after the tough processing of water after the material hot rolling of the present invention, material has advantages such as low magnetic permeability, HS, high-ductility, improves the mechanical property that Fe-Mn is a nonmagnetic steel greatly.The present invention has following advantage:
1. has good performance.The tensile strength of the obtained 1070MPa that the present invention obtains and 58% unit elongation, hardness 22HRC, magnetic permeability less than, machinability and impact briquetting performance are good, enlarge the use range of austenitic nonmagnetic steel.
2. the preparation method is simple, reduces investment.Adopt rolling method that the tough high Mn austenitic steel of water is carried out strain hardening in advance and handle, can crystal grain thinning, improve tissue and performance.Utilize traditional steel-making, forging, rolling technology and thermal treatment process, most iron and steel enterprises just can produce on the existing equipment basis, need not the input of new installation.
3. application prospect is good.The austenitic nonmagnetic steel of the low magnetic permeability for preparing, HS, high-ductility; Good moldability; Can be used for making desired strength height, wear resistance good electron industrial part and various requirement and not have magnetic, high-strength high hard environment; Provide good technical to instruct for improving structural part with the performance of nonmagnetic steel, under the prerequisite of use sheet material, can replace High Manganese Steel Casting and rich chromium cast iron.
4. cost is low, save energy.Ferrous materials of the present invention has only added Mn and little amount of N b element, the manganese aboundresources, and price is relatively cheap, need not add valuable metallic element and can obtain this ferrous materials, produces in enormous quantities, and save energy reduces and pollutes.
Description of drawings
Fig. 1 is 500 times of metallographs of sample of embodiment 1.
Fig. 2 is 500 times of metallographs of sample of embodiment 2.
Embodiment
Embodiment 1
Composition: C:0.95%, Mn:14.9%, Si:0.38%; Nb:0.012%; P≤0.007%; S≤0.0047; Its surplus is iron or unavoidable impurities.
Smelt: utilize electromagnetic induction furnace vacuum melting, receive argon shield, obtain to satisfy the ingot casting of composition requirement.
Forge: forging temperature is slowly heating in the forging process, Heating temperature: 1150～1200 ℃, soaking time: 30min, open the forging temperature: 1200 ℃, final forging temperature: >=900 ℃.
Rolling technology: 1200 ℃ of hot rolling Heating temperatures are incubated after 1 hour hot rolling on 350 2 roller hot rollss; Obtaining thickness is the latten about 6-7mm; Total deformation is 80～90%, and its open rolling and finishing temperature are respectively 1050 ℃ and 900 ℃, carry out the tough processing of water then.
The tough treatment process of water: the hot-rolled steel sheet that 7mm is thick is heated to 1000 ℃, and insulation 15min puts into cold water then rapidly and cools off.
The above-mentioned alloy that makes is got two groups, carry out metallography microscope observation, hardness measurement and mechanics tension test respectively, each item performance is following:
| Test piece number (Test pc No.) | Disproportional extension strength Rp/MPa | Tensile strength Rm/MPa | Unit elongation A/% | Rockwell hardness HRC |
| 1# | 366 | 1070 | 57.8 | 23 |
| 2#- | 365 | 1046 | 59.0 | 21 |
2, fabric analysis
From metallograph can observe tissue with etc. the axle austenite crystal be main, have tangible annealing twin.See Fig. 1.Crystal grain is than Fig. 2 refinement.
Control group embodiment 2
Composition: C:0.86%, Mn:14.4%, Si:0.42%; P≤0.008%; S≤0.0055; Its surplus is iron or inevitable magazine.
Smelt: utilize electromagnetic induction furnace vacuum melting, receive argon shield, obtain to satisfy the ingot casting of composition requirement.
Forge: forging temperature is slowly heating in the forging process, Heating temperature: 1150～1200 ℃, soaking time: 30min, open the forging temperature: 1200 ℃, final forging temperature: >=900 ℃.
Rolling technology: 1200 ℃ of hot rolling Heating temperatures are incubated after 1 hour hot rolling on 350 2 roller hot rollss; Obtaining thickness is the latten about 6-7mm; Total deformation is 80～90%, and its open rolling and finishing temperature are respectively 1050 ℃ and 900 ℃, carry out the tough processing of water then.
The tough treatment process of water: the hot-rolled steel sheet that 7mm is thick is heated to 1000 ℃, and insulation 15min puts into cold water then rapidly and cools off.
The above-mentioned alloy that makes is got two groups, carry out metallography microscope observation, hardness measurement and mechanics tension test respectively, each item performance is following:
| Test piece number (Test pc No.) | Disproportional extension strength Rp/MPa | Tensile strength Rm/MPa | Unit elongation A/% | Rockwell hardness HRC |
| 1# | 329 | 982 | 51.5 | 17 |
| 2#- | 321 | 968 | 50.0 | 16 |
2, fabric analysis
From metallograph can observe tissue with etc. the axle austenite crystal be main, have tangible annealing twin, crystal grain is thicker, sees Fig. 2.
Claims (3)
1. one kind contains the high manganese nonmagnetic steel of niobium, it is characterized in that its composition is by mass percentage: Mn:10%～15%, C:0.8%～1.2%, Si:0.3%～0.5%, P: 0.008%, S: 0.005%, Nb:0.01%～0.02%, all the other are Fe.
2. according to the said high manganese nonmagnetic steel of niobium that contains of claim 1, it is characterized in that: the mass ratio of described Mn and C is 13-15.
3. according to the said preparation method who contains the high manganese nonmagnetic steel of niobium of claim 1, it is characterized in that:
Step 1, smelt cast: according to containing after each element ratio carries out raw materials mix in the high manganese nonmagnetic steel of niobium, adopt electromagnetic induction furnace vacuum melting, the applying argon gas protection is cast into slab; Perhaps smelt, pour into a mould continuous casting and become strand;
Step 2, hot rolling technology: hot rolling finishing temperature is 850 ℃ ~ 950 ℃, obtains hot rolling blank;
Step 3, thermal treatment process: the tough treatment temp of hot rolling blank water is 900 ℃ ~ 1100 ℃, insulation 15min ~ 30min, and shrend obtains containing the high manganese nonmagnetic steel of niobium.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| EP3404677A1 (en) | 2017-05-17 | 2018-11-21 | ABB Schweiz AG | Protection arrangement for an inductive device |
| CN110883317A (en) * | 2019-11-25 | 2020-03-17 | 衡阳市鑫诚和重型机械设备制造有限公司 | Casting process of reinforced steel plate of hopper of mine dump truck |
| CN112662932A (en) * | 2019-10-15 | 2021-04-16 | 中国石油化工股份有限公司 | TWIP steel and preparation method thereof |
| CN113941430A (en) * | 2021-10-13 | 2022-01-18 | 铜陵有色金神耐磨材料有限责任公司 | Wear-resistant high-manganese steel based on TWIP effect and nano precipitation strengthening, and preparation method and application thereof |
| CN114196892A (en) * | 2021-12-17 | 2022-03-18 | 西安交通大学 | Nb-V alloyed high manganese steel and preparation method and application thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57185958A (en) * | 1981-05-07 | 1982-11-16 | Nippon Kokan Kk <Nkk> | High-manganese nonmagnetic steel with remarkably high specific resistance |
| JPS63259022A (en) * | 1987-04-15 | 1988-10-26 | Nkk Corp | Manufacture of high-mn nonmagnetic steel excellent in stability of magnetic permeability |
| CN102333900A (en) * | 2009-02-27 | 2012-01-25 | 日本冶金工业株式会社 | High-mn austenite stainless steel and metal part for clothing |
-
2012
- 2012-06-28 CN CN201210222982XA patent/CN102747273A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57185958A (en) * | 1981-05-07 | 1982-11-16 | Nippon Kokan Kk <Nkk> | High-manganese nonmagnetic steel with remarkably high specific resistance |
| JPS63259022A (en) * | 1987-04-15 | 1988-10-26 | Nkk Corp | Manufacture of high-mn nonmagnetic steel excellent in stability of magnetic permeability |
| CN102333900A (en) * | 2009-02-27 | 2012-01-25 | 日本冶金工业株式会社 | High-mn austenite stainless steel and metal part for clothing |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| EP3404677A1 (en) | 2017-05-17 | 2018-11-21 | ABB Schweiz AG | Protection arrangement for an inductive device |
| CN112662932A (en) * | 2019-10-15 | 2021-04-16 | 中国石油化工股份有限公司 | TWIP steel and preparation method thereof |
| CN112662932B (en) * | 2019-10-15 | 2022-03-04 | 中国石油化工股份有限公司 | TWIP steel and preparation method thereof |
| CN110883317A (en) * | 2019-11-25 | 2020-03-17 | 衡阳市鑫诚和重型机械设备制造有限公司 | Casting process of reinforced steel plate of hopper of mine dump truck |
| CN113941430A (en) * | 2021-10-13 | 2022-01-18 | 铜陵有色金神耐磨材料有限责任公司 | Wear-resistant high-manganese steel based on TWIP effect and nano precipitation strengthening, and preparation method and application thereof |
| CN113941430B (en) * | 2021-10-13 | 2023-05-02 | 铜陵有色金神耐磨材料有限责任公司 | Wear-resistant high manganese steel based on TWIP effect and nano precipitation strengthening, preparation method and application |
| CN114196892A (en) * | 2021-12-17 | 2022-03-18 | 西安交通大学 | Nb-V alloyed high manganese steel and preparation method and application thereof |
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Application publication date: 20121024 |