CN101586217A - Low-cost and ultra-high strength and toughness martensite steel and manufacturing method thereof - Google Patents
Low-cost and ultra-high strength and toughness martensite steel and manufacturing method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 55
- 239000010959 steel Substances 0.000 title claims abstract description 55
- 229910000734 martensite Inorganic materials 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 10
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 10
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 10
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 10
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 9
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 9
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 8
- 238000010791 quenching Methods 0.000 claims description 16
- 230000000171 quenching effect Effects 0.000 claims description 16
- 239000002893 slag Substances 0.000 claims description 15
- 238000005496 tempering Methods 0.000 claims description 12
- 238000007493 shaping process Methods 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 6
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 5
- 238000009749 continuous casting Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 241001417490 Sillaginidae Species 0.000 claims description 2
- 238000005242 forging Methods 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 10
- 239000000463 material Substances 0.000 abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 5
- 239000007769 metal material Substances 0.000 abstract description 3
- 230000001681 protective effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 10
- 229910045601 alloy Inorganic materials 0.000 description 9
- 239000000956 alloy Substances 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 239000011572 manganese Substances 0.000 description 7
- 239000010955 niobium Substances 0.000 description 7
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 239000010936 titanium Substances 0.000 description 6
- 229910001566 austenite Inorganic materials 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 241001062472 Stokellia anisodon Species 0.000 description 3
- 238000005275 alloying Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000009776 industrial production Methods 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000007669 thermal treatment Methods 0.000 description 2
- 229910001129 Aermet Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910001240 Maraging steel Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910020830 Sn-Bi Inorganic materials 0.000 description 1
- 229910018728 Sn—Bi Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
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- 239000002994 raw material Substances 0.000 description 1
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- 239000010703 silicon Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The invention belongs to the field of metallic materials, and in particular relates to low-cost and ultra-high strength and toughness martensite steel and a manufacturing method thereof. The low-cost and ultra-high strength and toughness martensite steel comprises the following compositions by mass percentage: 0.4 to 0.9 percent of C, 1.4 to 2.0 percent of Si, 1.5 to 2.0 percent of Mn, 0.5 to 1.0 percent of Cr, 0.2 to 0.6 percent of Ni, 0.05 to 0.1 percent of Al, 0.008 to 0.05 percent of N, 0.01 to 0.2 percent of Ti, 0.01 to 0.2 percent of Nb, less than or equal to 0.01 percent of S, less than or equal to 0.01 percent of P, and the balance of iron element and inevitable impurities. The steel is suitable for the fields of wear resistance and protection, in particular materials for protective armours and wear-resistant engineering plants.
Description
Technical field
The invention belongs to metal material field, relate in particular to a kind of low-cost ultrahigh-strength steel and manufacture method thereof, these steel are suitable for wear-resisting, protection field is specially adapted to protect plate armour and wear-resistant engineering machinery material.
Background technology
Iron and steel is the base mateiral of national economy; demand is big; ferrous metallurgy is again to expend the energy, the heavier industry of contaminate environment simultaneously; urgent day by day along with energy dilemma, raw material crisis, environment protection; improve the intensity of steel; reduce the output of steel, realize minimizing production, can not allow to delay.Simultaneously, but the more high-intensity bolt of the demand for development of bullet train, high strength and attrition resistant rail and wheel hub etc. to satisfy the sufficiently long life-span of train high-speed cruising; Hard flak jackets, armoured van, alert demand for development intensity with panzer is higher and have certain flexible steel plate is used for flak jackets, steel helmet and plate armour as bullet resistant material.So ultrahigh-strength steel has a extensive future.Present 2000MPa level martensite high-strength steel as 4340 steel (containing 0.4C-0.7Mn-1.8Ni-0.8Cr-0.25Mo) through tempering below 200 ℃, though can obtain the high strength of about 2000MPa, but unit elongation lower (＜10%), intensity when 200 ℃ of tempering is lower than 2000Mpa, and, the alloy content height; Maraging steel contains very low amount carbon and higher alloying element, as 18Ni, 8Co, with in the martensite between precipitating metal compound strengthened; And Secondery-hardening Ultrahigh Strength Steel, be that to separate out the coherence diffusion carbide be the reinforcement means, add the diffusion of the Co of more amount, significant solution strengthening and austenitic answer when postponing tempering in order to carbon.Guaranteeing that intensity can reach 2000MPa under the higher toughness condition.Develop the novel ultra-high strength steel AF1410 (0.16C-10Ni-2Cr-1Mo-14Co) in modern age thus, AF1410+Cr steel (0.16C-10Ni-3Cr-1.2Mo-14Co) and AerMet steel (0.24C-11Ni-3Cr-1.2Mo-13.4Co) are through the proper temperature tempering, tensile strength up to 2000MPa or more than, toughness near or surpass 40J.This two classes steel capital is on the basis of martensite strengthening, introduces precipitation strength, and its precipitate is very tiny, help to guarantee toughness preferably, but owing to contain a large amount of alloying elements, smelting, processing request complexity, it is higher to cause cost, unsuitable widespread use.Chinese periodical " Arms Material scientific and engineering " Vol.29No.2 Mar., 2006 " tissue and the mechanical properties of a 2200MPa grade super strength low alloy steel " literary composition discloses a kind of on the basis of 4340 steel, improve about carbon content to 0.5% (quality), it is 0.37% and 1.75% two kind of steel that release contains Si, get intensity through 200 and 270 ℃ of tempering respectively and be respectively 2205MPa and 2235MPa, K1c is respectively 61.5MPaml/2 and 52.3MPaml/2.The obdurability of this class steel is all good, but problem be carbon content greater than 0.5%, easily form cementite, present the temper brittleness behind quenching fragility (transgranular fracture) and the high tempering, and the alloy content height.2007 the 22nd volumes of Chinese periodical " thermal treatment " the 1st phase " the heat treated novel process of a steel " literary composition discloses a kind of cheap novel martensite type ultrahigh-strength steel through the processing of quenching-carbon distribution-low-temperaturetempering (Q-P-T) novel process.In martensitic steel, introduce the toughness that a certain amount of residual austenite is improved martensitic steel by the Q-P-T novel process, obtained C wt% less than 0.5% tensile strength greater than 2000Mpa, unit elongation is greater than 10% thin plate martensite type ultrahigh-strength steel, this is international newest fruits, and development potentiality is arranged very much.Because enrichment carbon is limited in one's ability in austenite, make this high-strength steel further improve relatively difficulty of unit elongation, the technological process of acquisition high strength martensitic steel is more complicated also.
CN101078088 (200610046693.3) discloses a kind of low-alloy super-strength martensitic steel, it is characterized in that composition range is as follows, mass percent: C 0.3～0.6, Mn0.8～2.0, Si 0.1～0.4, Cr 0.8～2.0, Mo 0.1～0.4, Al 1.0～2.5, S＜0.0L, P＜0.01, Fe surplus.After adopting quenching+low-temperaturetempering, carry out the technology that stabilizing aging is handled.Low-alloy super-strength steel of the present invention can pass through brief heat treating, makes it have the intensity of superelevation and certain toughness plasticity, thereby possesses lower cost.This invention has obtained 2000MPa level high strength steel, still, need long-time ageing treatment, and aluminium content is high by 1.0～2.5%, and big industrial production difficulty is big.
CN101270453 (200810112022) belongs to field of alloy steel, and particularly a kind of ultrahigh-strength thermal forming martensitic steel mainly is applicable to the minimal thickness part steel of tensile strength in the hot stamping moulding of 1.9-2.5GPA.The main chemical compositions of this steel is formed (weight %): C 0.40-0.60%, Si 0.50-2.30%, Mn≤0.25%, Cr 0.50-1.50%, Ni 0.80-3.00%, Mo0.15-0.40%, P≤0.015%, S≤0.005%, [O]≤0.003%, [N] 0.002-0.015% surplusly is Fe and inevitable impurity.In addition, also add Nb 0.02-0.10%, any one or two kinds of among the V 0.02-0.15%.Compare with existing thermal forming martensite steel 22MNB5 steel, steel of the present invention not only tensile strength has been brought up to 1.9-2.5GPA from 1.0-1.5GPA, and has plasticity (unit elongation＞8%) preferably, and hydrogen causes delayed fracture susceptibility obviously to be reduced, thereby is that automobile lightweight, high safety performanceization provide the foundation.This invention is main application with the hot stamping moulding with the minimal thickness part, adopt the cold prepared part of thermoforming mould, the cold restriction molding of mould has obtained 2000MPa level high strength steel, weak point is not mention the application of the thick size material in wear Protection field, product unit elongation lower (unit elongation＞8%), in addition, precious metal (Ni 0.80-3.00% is adopted in this invention, Mo0.15-0.40%) with low residual element control (P≤0.015%, S≤0.005%), having increased industrial production controls cost.
CN101225499 discloses a kind of low-alloy super-strength multiphase steel and heat treating method thereof, and the complex phase composition of steel is wt%:C 0.3-0.7, Si 0.01-3.0, Al 0.0-2.0, Nb 0.0-0.25, V 0.0-0.3, Mo 0.0-2.0, Ni 0.0-4.0, Mn 0.05-3.0, Cr 0.00-3.0, Co 0.00-2.0, W 0.0-2.0, S＜0.04, P＜0.04, all the other are Fe.Heat treating method is: at first workpiece is heated to 800-1000 ℃ and carries out the austenitizing processing, then workpiece is quenched rapidly in 50-250 ℃ the liquid quenching medium, again with workpiece partition in 250-450 ℃ liquid quenching medium, again workpiece is quenched rapidly to 100-250 ℃ of insulation, at last workpiece is quenched in the entry, make steel part have the residual austenite three-phase contexture of martensite, nanometer bainite and rich carbon, thereby increase the intensity and the plasticity of workpiece.This method has obtained performance and has cooperated all good steel, adopts complicated alloy designs, and thermal treatment process is more complicated also, quenchant has adopted Sn-Bi bath, oil bath, salt bath etc., and in the salt bath heat preservation hot treatment time long (1-500h), production cost is higher.
Summary of the invention
The shortcoming that the present inventor exists at above 2000MPa grade high-strength steel has drawn a kind of 2000MPa grade high-strength steel and preparation technology thereof that can suitability for industrialized production by analytical calculation and experimental study.This invention has overcome the alloy content height that above-mentioned disclosed document exists, unit elongation is low, complex manufacturing, shortcomings such as production cost height, utilize precipitation particles (to add nitrogen, titanium, the niobium element) replace alloying element to improve the intensity of steel, reduce the alloy consumption, by adjusting the unit elongation that the Composition Control residual austenite content improves material, by adopting the microalloy crystal grain thinning, shorten to reduce carbon from martensite to austenitic diffusion length, and utilize martensitic phase to become the replacement atom and do not have the diffusion shear, the characteristics that transformation rate is fast have designed the simple relatively preparation method of technology.
One aspect of the present invention provides a kind of 2000MPa level martensite high-strength steel that can suitability for industrialized production, it is characterized in that composition range is as follows, mass percent: C:0.4～0.9%, Si:1.4～2.0%, Mn:1.5～2.0%, Cr:0.5～1.0%, Ni:0.2～0.6%, Al:0.05～0.1%, N:0.008～0.05%, Ti:0.01～0.2%, Nb:0.01～0.2%, S: P≤0.01%≤0.01%,, all the other are ferro element and unavoidable impurities.
Preferably, 2000MPa level martensite high-strength steel, it is characterized in that composition range is as follows, mass percent: C:0.4～0.6%, Si:1.4～1.6%, Mn:1.6～1.8%, Cr:0.5～0.7%, Ni:0.2～0.4%, Al:0.06～0.09%%, N:0.01～0.04%, Ti:0.01～0.03%%, Nb:0.02～0.06%%, S: P≤0.01%≤0.01%,, all the other are ferro element and unavoidable impurities.
Furthermore, the present invention replaces rare metals such as the expensive nickel of price comparison, molybdenum, cobalt with the cheap carbon of price comparison, silicon, manganese, aluminium and microalloy, reach the strength and toughness that improves steel, replace complicated heat treatment technology with quenching, low-temperaturetempering technology generations that industrial production can realize, replace the generally quenching-tempering-aging technique of employing, reduce production costs.
Preferably, described 2000MPa level martensite high-strength steel is characterized in that tensile strength sigma
bBe 2000～2500MPa, unit elongation δ (%) is 10～18%.
The present invention provides a kind of and the corresponding preparation method of mentioned component on the other hand, and described preparation method comprises following steps:
1) smelts, casts.
2) forging or roll forming, the original shaping temperature is 1100 ℃～1200 ℃, 850 ℃～1000 ℃ of final shaping unit temperature.
3) use water quenching, 800 ℃～900 ℃ of quenching temperatures.
4) tempering, 150 ℃～250 ℃ of temperature, soaking time 2～15h.
Preferably, carry out the electro-slag continuous casting remelting after the step 1), slag system is CaF
2: Al
2O
3=70%: 30%, the quantity of slag keeps 30～80Kg, molten speed: 10～15Kg/min, air cooling.This step of product for general applications can be omitted.
Beneficial effect
Manufacturing of the present invention be a kind of 2000MPa of having grade high-strength steel, methods such as refined crystalline strengthening, precipitation strength, precipitation strength have been used, in conjunction with participating in austenite control, improved the plasticity of high-strength steel, the invention has the beneficial effects as follows and taken into full account cheap effect of trace elements, consider and reduced the consumption of rare alloy element again, reduced production cost, quenching, the tempering process that utilizes industrialization to realize easily simplified the manufacturing process of material, and intensity 2100MPa, unit elongation 12.5% material sample have been produced.
Embodiment
The present invention is further elaborated and explanation for following application example.
In following examples, intensity, unit elongation are processed into the standard tensile sample and measure according to GB/T 228-2002 metallic substance tensile test at room temperature method.Intensity is tensile strength.
Embodiment 1
Chemical ingredients is by following control, and all the other are ferro element and unavoidable impurities for mass percent: C:0.39%, Si:1.4%, Mn:1.8%, Cr:0.8%, Ni:0.6%, Al:0.08%, N:0.05%, Ti:0.12%, Nb:0.18%, S:0.002%, P:0.01%..Smelt, cast electro-slag continuous casting remelting, slag system: CaF
2: Al
2O
3=70%: 30%, the quantity of slag keeps 30Kg, molten speed: 15Kg/min, air cooling.Roll forming, thickness 3.0mm, the original shaping temperature is 1200 ℃, 950 ℃ of final shaping unit temperature.Use water quenching, 900 ℃ to 250 ℃ of quenching temperatures, insulation 1h is quenched to room temperature, tempering, 200 ℃ of temperature, soaking time 5h.Obtained intensity 2050MPa, the steel of unit elongation 10.6%.
Embodiment 2
Chemical ingredients is by following control, mass percent: C:0.9%, Si:1.4%, Mn:1.8%, Cr:0.6%, Ni:0.5%, Al:0.08%, N:0.05%, Ti:0.15%, Nb:0.12%, S:0.003%, P:0.008%.All the other are ferro element and unavoidable impurities.Smelt, cast electro-slag continuous casting remelting, slag system: CaF
2: Al
2O
3=70%: 30%, the quantity of slag keeps 30Kg, molten speed: 10Kg/min, air cooling.Roll forming, thickness 3.5mm, the original shaping temperature is 1200 ℃, 950 ℃ of final shaping unit temperature.Use water quenching, 900 ℃ to 350 ℃ of quenching temperatures, insulation 1h is quenched to room temperature, tempering, 250 ℃ of temperature, soaking time 10h.Obtained intensity 2100MPa, the steel of unit elongation 12%.
Embodiment 3
Chemical ingredients is by following control, and all the other are ferro element and unavoidable impurities for mass percent: C:0.59%, Si:2.0%, Mn:1.5%, Cr:1.0%, Ni:0.3%, Al:0.07%, N:0.01%, Ti:0.02%, Nb:0.04%, S:0.005%, P:0.01%..Smelt, cast electro-slag continuous casting remelting, slag system: CaF
2: Al
2O
3=70%: 30%, the quantity of slag keeps 70Kg, molten speed: 15Kg/min, air cooling.Roll forming, thickness 3.0mm, the original shaping temperature is 1100 ℃, 850 ℃ of final shaping unit temperature.Use water quenching, 850 ℃ to 250 ℃ of quenching temperatures, insulation 1h is quenched to room temperature, tempering, 150 ℃ of temperature, soaking time 15h.Obtained intensity 2120MPa, the steel of unit elongation 12.5%.
Claims (5)
1. 2000MPa level martensite high-strength steel, it is characterized in that composition range is as follows, mass percent: C:0.4～0.9%, Si:1.4～2.0%, Mn:1.5～2.0%, Cr:0.5～1.0%, Ni:0.2～0.6%, Al:0.05～0.1%, N:0.008～0.05%, Ti:0.01～0.2%, Nb:0.01～0.2%, S: P≤0.01%≤0.01%,, all the other are ferro element and unavoidable impurities.
2. 2000MPa level martensite high-strength steel as claimed in claim 1, it is characterized in that composition range is as follows, mass percent: C:0.4～0.6%, Si:1.4～1.6%, Mn:1.6～1.8%, Cr:0.5～0.7%, Ni:0.2～0.4%, Al:0.06～0.09%%, N:0.01～0.04%, Ti:0.01～0.03%%, Nb:0.02～0.06%%, S: P≤0.01%≤0.01%,, all the other are ferro element and unavoidable impurities.
3. 2000MPa level martensite high-strength steel as claimed in claim 1 is characterized in that tensile strength sigma
bBe 2000～2500MPa, unit elongation δ (%) is 10～18%.
4. the preparation method of 2000MPa level martensite high-strength steel as claimed in claim 1 comprises following steps:
1) smelts, casts;
2) forging or roll forming, the original shaping temperature is 1100 ℃～1200 ℃, 850 ℃～1000 ℃ of final shaping unit temperature;
3) use water quenching, 800 ℃～900 ℃ of quenching temperatures;
4) tempering, 150 ℃～250 ℃ of temperature, soaking time 2～15h.
5. the preparation method of 2000MPa level martensite high-strength steel as claimed in claim 1 is characterized in that, carries out the electro-slag continuous casting remelting after the step 1), and slag system is CaF
2: Al
2O
3=70%: 30%, the quantity of slag keeps 30～80Kg, molten speed: 10～15Kg/min, air cooling.
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| CN103517996A (en) * | 2011-05-12 | 2014-01-15 | 安赛乐米塔尔研究与发展有限责任公司 | Method for the production of martensitic steel having a very high yield point and sheet or part thus obtained |
| CN104131142A (en) * | 2014-07-16 | 2014-11-05 | 东北大学 | Rapid heat treatment method of martensite steel for automobiles |
| CN105369150A (en) * | 2014-08-27 | 2016-03-02 | 宝钢特钢有限公司 | Super-strength armour plate and manufacturing method thereof |
| CN106086655A (en) * | 2016-08-17 | 2016-11-09 | 南京工程学院 | A kind of anti-collision hot forming martensite steel being conducive to optimizing retained austenite |
| CN110139942A (en) * | 2016-12-22 | 2019-08-16 | 株式会社Posco | High hardness wear-resisting steel and its manufacturing method |
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- 2009-06-25 CN CN2009100166010A patent/CN101586217B/en not_active Expired - Fee Related
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