CN104109800A - High-strength vanadium-containing high-manganese non-magnetic steel and production method thereof - Google Patents
High-strength vanadium-containing high-manganese non-magnetic steel and production method thereof Download PDFInfo
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Abstract
The invention discloses high-strength vanadium-containing high-manganese non-magnetic steel and a production method thereof. The steel comprises the following chemical components by weight: 0.15 to 0.25% of C, 0.2 to 0.4% of Si, 18 to 20% of Mn, no more than 0.015% of P, no more than 0.010% of S, 0.5 to 1.0% of V, with the balance being Fe and unavoidable impurities. The production method is carried out according to common technology for clean steel and comprises the following steps: electric furnace smelting; ladle furnace refining; vacuum treatment; bottom-pouring die casting; casting blank heating; rolling; tempering; and air cooling. The steel has yield strength of no less than 500 MPa, tensile strength of no less than 700 MPa, elongation percentage A of no less than 40% and relative permeability mu of no more than 1.05 and is applicable to manufacturing of equipment like transformers and generators. Meanwhile, the steel has the advantages of simple chemical components, low cost, easy production and operation, high production efficiency and substantial economic benefits and social benefits.
Description
Technical field
The invention belongs to smelting iron and steel technical field, particularly a kind of required high strength of the engineerings such as transformer, generator, nuclear power that is applicable to is containing the high manganese nonmagnetic steel of vanadium and production method thereof.
Background technology
Nonmagnetic steel refers to the steel that does not produce magneticinduction in magnetic field, and its tissue is mainly austenite, magnetic permeability μ≤1.29 × 10
-6h/m.The purposes of nonmagnetic steel is very extensive, in automatic control system, precision meter, telecommunication and motor, and in many military fields, all needs to adopt nonmagnetic steel.Along with social progress and expanding economy, the demand of high-performance nonmagnetic steel is increased day by day.Now widely used nonmagnetic steel is mainly 20Mn23AlV series, its magnetic permeability is relatively low, but yield strength is lower, identical with Q235 hardness of steel rank, often need to meet service requirements by improving steel plate thickness, increase production difficulty on the one hand, strengthened rolled steel dosage simultaneously, be contrary to current " high-strength attenuate " main flow steel trend.
Before the present patent application, application number is that 201110329175.3 Chinese patent has been announced " hot rolled strip of a kind of low relative magnetic permeability and preparation method thereof ", the composition of this hot rolled strip is by weight percentage: C:0.25～0.35%, Si:0.5～0.6%, Mn:25～26%, Al:3.8～4.2%, V:0.06～0.1%, P:0.02～0.03%, S:0.02～0.03%, all the other are Fe; The metallographic structure of this steel is that grain-size is the austenite of 20 μ m.Its preparation method is: by set component smelting molten steel and cast strand, carry out roughing and obtain intermediate blank after heating, after finish rolling, belt steel thickness is 2～14mm, and cooled coil of strip obtains finished product hot rolled strip after solution treatment and actual effect are processed.The over-all properties of this steel is more excellent, its room temperature yield strength >=400MPa, tensile strength >=750MPa, elongation after fracture >=66%, relative magnetic permeability≤1.002; But the deficiency of this patented technology is to have added and be about 3.8～4.2%Al content in chemical composition, higher Al content easily produces oxidation in process of production, and surface quality is poor, easily form crackle, reduce the rate of steel products produced to steel ingots, increase production cost, and need the tough processing of water, production process complexity.Application number is that the Chinese patent of 201210222982.X has been announced " a kind of containing high manganese nonmagnetic steel of niobium and preparation method thereof ", 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%, and all the other are Fe; Should be containing the high manganese nonmagnetic steel of niobium preparation process: the tough processing of smelting, forging, hot rolling and water, hot-rolled sheet is in process furnace after 1000 DEG C of insulation 15min, and shrend, obtains the tensile strength of 900～1100MPa and 50～60% unit elongation, Rockwell hardness 15～22HRC, magnetic permeability is less than 1.0002.The tensile strength of this steel is higher, but its deficiency is C too high levels in steel, easily produces carbide network in production process, easily crisp, and needs the tough processing of water, production process complexity.Application number is that 201110054633.7 Chinese patent has been announced " a kind of drilling tool nonmagnetic steel and preparation method thereof ", its chemical composition contains C:0.30～0.40% by weight percentage, Si≤0.8%, Mn:7.0～9.0%, P≤0.06%, S≤0.01%, Cr:3.0～4.0%, Ni:8.0～10.0%, V:1.0～1.5%, all the other are iron, and this steel is by adopting the preparation method of solid-solution and aging heat treatment reinforcing process.The deficiency of this patented technology is to have added in chemical composition the Ni of high level, has greatly increased production cost.
Therefore be badly in need of the nonmagnetic steel of exploitation high strength, high comprehensive performance, to meet the demand of social development.
Summary of the invention
Object of the present invention will overcome the deficiencies in the prior art exactly, the high strength that provides a kind of low cost, be easy to produce is containing the high manganese nonmagnetic steel of vanadium and production method thereof, the yield strength >=500MPa of this steel, tensile strength >=700MPa, unit elongation A >=40%, relative magnetic permeability μ≤1.05.
For achieving the above object, the designed high strength of the present invention contains the high manganese nonmagnetic steel of vanadium, its Chemical Composition by weight percentage ratio is counted: C:0.15～0.25%, Si:0.2～0.4%, Mn:18～20%, P≤0.015%, S≤0.010%, V:0.5～1.0%, all the other are Fe and are inevitably mingled with.
Preferably, its Chemical Composition by weight percentage ratio is counted C:0.15～0.22%, Si:0.26～0.34%, and Mn:18.3～19.5%, P≤0.015%, S≤0.010%, V:0.70～0.85%, all the other are Fe and are inevitably mingled with.
High strength of the present invention, containing the production method of the high manganese nonmagnetic steel of vanadium, is undertaken by common Clean Steel technique, comprises the step of electrosmelting, ladle furnace refining, vacuum-treat, bottom pour mold die casting, strand heating, rolling, temper, air cooling, and its special character is:
Described slab heating temperature is 1200～1250 DEG C, insulation 2h;
Described vacuum-treat is to be circulated and further removed impurity and gas by vacuum system;
When described rolling, start rolling temperature >=1100 DEG C, finishing temperature >=900 DEG C, roll rear slow cooling to room temperature.
Preferably, when described temper, steel plate is at 500～600 DEG C of insulation 1h.
High strength of the present invention is as follows containing processing parameter setting principle in the mechanism of each constituent content control in the high manganese nonmagnetic steel of vanadium and effect and production process:
(1) carbon (C) weight percentage is that 0.15～0.25%, C is conducive to form single-phase austenite structure in steel, is also effective solution strengthening element simultaneously.But in the time that carbon content is higher, in as-cast structure, carbide quantity increases, and forms continuous and semicontinuous carbide network on austenite grain boundary, has greatly weakened plasticity, the toughness of intergranular intensity and steel.Though can make partially carbonized thing dissolve in austenite after solution treatment, in the present invention, do not adopt solution treatment in order to enhance productivity, therefore C content is controlled at lower scope, is preferably 0.15～0.22%.
(2) manganese: Mn expands austenitic area and makes consumingly the stable element of austenite, Mn in steel most of solid solution in austenite, form displaced type sosoloid, matrix is strengthened, and along with the increase of Mn content, γ → ε and γ → ε → α ˊ martensite transformation temperature reduce, and also dwindle (Fe, Mn) simultaneously
3the temperature range that C separates out, increases austenitic high-temperature stability.In order to make to be organized as full austenite in steel, Mn weight percentage is controlled at 18～20% left and right, is preferably 18.3～19.5%.
(4) atomic radius of silicon: Si is more much smaller than austenite, so its solution strengthening effect is obvious.In steel, add a small amount of Si, can improve the resistivity of material, to reduce eddy current.Si is non-carbide forming element in steel, can reduce the solubleness of C in austenite and promote Carbide Precipitation in high mangaenese steel, unfavorable to austenite structure stability, and Si has the effect that impels large dendritic crystal to form in the time of high mangaenese steel crystallization, and make the grain coarsening of steel, reduce the mechanical property of materials.Generally speaking, select Si weight percentage 0.2～0.4%, be preferably 0.26～0.34%.
(5) vanadium: V is the element that strongly forms carbide, separates out fine VC and improve intensity in the time of ageing treatment.In steel, adding massfraction is that more than 0.3% V just can obtain obvious disperse educt strengthening, and along with the increase of add-on, its strengthening effect also constantly strengthens, and adds 5% with interior V, magnetic permeability not to be affected substantially.Test shows, V content, lower than 0.5%, is not enough to generate enough VC strengthening matrixes, and V content is higher than 1.0%, causes unnecessary waste and reduces the plasticity of steel.Therefore, for reaching the required intensity of steel of the present invention, V content is controlled to 0.5～1.0%, is preferably 0.70～0.85%.
(9) phosphorus, sulphur: P is harmful element in high manganese nonmagnetic steel, when P too high levels, will separate out with the form of carbide and P eutectic, and P eutectic is fragility tissue, unfavorable to the mechanical property of steel.S easily forms plasticity sulfide, easily make steel plate produce layering, therefore P, S content are more low better, if but its content is limited too lowly, can increase production cost and difficulty, therefore, ensureing plate property and generating under the prerequisite of stability, P, S content in steel are controlled at respectively≤0.015% and≤0.010% scope.
Above-mentioned high strength is containing in the production process of the high manganese nonmagnetic steel of vanadium, control slab heating temperature the comparatively high temps scope of 1200～1250 DEG C, this heat is conducive to make strand fully to be grilled thoroughly, and be incubated 2 hours and make its full and uniformization, to eliminate internal stress, reduce the cracking frequency in the operation of rolling.The object of controlling temperature >=900 DEG C of finish to gauge is: the too low steel that will make of temperature, because work hardening is difficult to rolling, aggravates the generation of crackle simultaneously, and therefore, the application's steel must complete rolling above at 900 DEG C.Control tempering temperature is 500～600 DEG C and is conducive to make VC second-phase in steel fully to be separated out, and strengthening austenitic matrix is effectively eliminated steel plate unrelieved stress simultaneously, is beneficial to subsequent production and processes.
By the each processing parameter in content and the production method of each component in strict restriction steel, high strength of the present invention is containing the yield strength >=500MPa of the high manganese nonmagnetic steel of vanadium, tensile strength >=700MPa, unit elongation A >=40%, relative magnetic permeability μ≤1.05, are applicable to the manufacture of the equipment such as transformer, generator.Meanwhile, steel chemical composition of the present invention is simple, with low cost, and is easy to production operation, and production efficiency is high, has significant economic benefit and social benefit.
Embodiment
Below in conjunction with specific embodiment, high strength of the present invention is described in further detail containing the high manganese nonmagnetic steel of vanadium and production method thereof:
The selected high strength of embodiment 1～9 is containing chemical composition (surplus is Fe and inevitable impurity) as shown in table 1 by weight percentage of the high manganese nonmagnetic steel of vanadium.
The chemical composition (wt%) of table 1 various embodiments of the present invention steel
| Embodiment | C | Mn | Si | P | S | V |
| 1 | 0.16 | 18.3 | 0.22 | 0.014 | 0.008 | 0.65 |
| 2 | 0.18 | 19.5 | 0.29 | 0.012 | 0.010 | 0.70 |
| 3 | 0.20 | 19.4 | 0.35 | 0.010 | 0.004 | 0.93 |
| 4 | 0.19 | 20.0 | 0.20 | 0.013 | 0.007 | 1.00 |
| 5 | 0.22 | 18.9 | 0.34 | 0.010 | 0.006 | 0.79 |
| 6 | 0.25 | 19.7 | 0.26 | 0.011 | 0.008 | 0.50 |
| 7 | 0.15 | 19.3 | 0.40 | 0.012 | 0.009 | 0.68 |
| 8 | 0.18 | 18.0 | 0.37 | 0.011 | 0.009 | 0.87 |
| 9 | 0.20 | 19.0 | 0.33 | 0.012 | 0.008 | 0.73 |
Table 1 has been listed 9 groups of concrete Chemical Composition that can be used for the required high-intensity non-magnetic steel of the engineerings such as transformer, generator, nuclear power of the present invention, above-mentioned high strength comprises the following steps containing the production method of the high manganese nonmagnetic steel of vanadium: undertaken by common Clean Steel technique, comprise the step of electrosmelting, ladle furnace refining, vacuum-treat, bottom pour mold die casting, rolling, temper, air cooling, wherein, molten steel adopts electrosmelting to carry out ladle furnace refining again, vacuum system circular treatment is further removed impurity and gas, adopts bottom pour mold die casting.Be rolled subsequently.Strand is heated to 1200～1250 DEG C, is incubated 2 hours, start rolling temperature >=1100 DEG C, finishing temperature >=900 DEG C, roll rear slow cooling to room temperature.Temper: steel plate was 500～600 DEG C of insulations 1 hour, and air cooling, makes high-intensity non-magnetic steel plate.
Correspondingly, in table 1 high strength of embodiment 1～9 containing vanadium high manganese nonmagnetic steel processing parameter and properties detected result in table 2.
Table 2
Various embodiments of the present invention main production parameter and performance test results
As can be seen from Table 2, high strength of the present invention can meet yield strength >=500MPa, tensile strength >=700MPa, unit elongation A >=40%, μ≤1.05 containing the high manganese nonmagnetic steel of vanadium.All be applicable to the manufacture of the equipment such as transformer, generator.Meanwhile, steel chemical composition of the present invention is simple, with low cost, and is easy to production operation, and production efficiency is high, has significant economic benefit and social benefit.
Claims (4)
1. high strength, containing the high manganese nonmagnetic steel of vanadium, is characterized in that: the Chemical Composition of this steel by weight percentage ratio is counted: C:0.15～0.25%, Si:0.2～0.4%, Mn:18～20%, P≤0.015%, S≤0.010%, V:0.5～1.0%, all the other are Fe and are inevitably mingled with.
2. high strength according to claim 1 is containing the high manganese nonmagnetic steel of vanadium, it is characterized in that: its Chemical Composition by weight percentage ratio is counted C:0.15～0.22%, Si:0.26～0.34%, Mn:18.3～19.5%, P≤0.015%, S≤0.010%, V:0.70～0.85%, all the other are Fe and are inevitably mingled with.
Described in claim 1 high strength containing the production method of the high manganese nonmagnetic steel of vanadium, undertaken by common Clean Steel technique, the step that comprises electrosmelting, ladle furnace refining, vacuum-treat, bottom pour mold die casting, strand heating, rolling, temper, air cooling, is characterized in that:
Described slab heating temperature is 1200～1250 DEG C, insulation 2h;
When described rolling, start rolling temperature >=1100 DEG C, finishing temperature >=900 DEG C, roll rear slow cooling to room temperature.
4. high strength according to claim 3 contains the production method of the high manganese nonmagnetic steel of vanadium: it is characterized in that: when described temper, steel plate is at 500～600 DEG C of insulation 1h.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107177786A (en) * | 2017-05-19 | 2017-09-19 | 东北大学 | The design and its manufacture method of a kind of high manganese cut deal of LNG storage tank |
| CN108796383A (en) * | 2017-04-27 | 2018-11-13 | 宝山钢铁股份有限公司 | A kind of titaniferous high-intensity and high-tenacity nonmagnetic steel and its manufacturing method |
| CN110578099A (en) * | 2019-10-17 | 2019-12-17 | 惠州濠特金属科技有限公司 | Corrosion-resistant non-magnetic steel and preparation method thereof |
| CN111363970A (en) * | 2020-03-30 | 2020-07-03 | 南京钢铁股份有限公司 | Nickel-free LPG (liquefied Petroleum gas) steel plate for ship and manufacturing method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108796383A (en) * | 2017-04-27 | 2018-11-13 | 宝山钢铁股份有限公司 | A kind of titaniferous high-intensity and high-tenacity nonmagnetic steel and its manufacturing method |
| CN107177786A (en) * | 2017-05-19 | 2017-09-19 | 东北大学 | The design and its manufacture method of a kind of high manganese cut deal of LNG storage tank |
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| CN110578099A (en) * | 2019-10-17 | 2019-12-17 | 惠州濠特金属科技有限公司 | Corrosion-resistant non-magnetic steel and preparation method thereof |
| CN111363970A (en) * | 2020-03-30 | 2020-07-03 | 南京钢铁股份有限公司 | Nickel-free LPG (liquefied Petroleum gas) steel plate for ship and manufacturing method thereof |
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