CN101586217B - 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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- CN101586217B CN101586217B CN2009100166010A CN200910016601A CN101586217B CN 101586217 B CN101586217 B CN 101586217B CN 2009100166010 A CN2009100166010 A CN 2009100166010A CN 200910016601 A CN200910016601 A CN 200910016601A CN 101586217 B CN101586217 B CN 101586217B
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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 thanor 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 protectiv e 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 (4)
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; Tensile strength sigma
bBe 2000～2500MPa, unit elongation δ (%) is 10～18%.
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. 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.
4. the preparation method of 2000MPa level martensite high-strength steel as claimed in claim 3 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2012153009A1 (en) * | 2011-05-12 | 2012-11-15 | Arcelormittal Investigación Y Desarrollo Sl | Method for the production of very-high-strength martensitic steel and sheet thus obtained |
| CN104131142A (en) * | 2014-07-16 | 2014-11-05 | 东北大学 | Rapid heat treatment method of martensite steel for automobiles |
| CN105369150B (en) * | 2014-08-27 | 2017-03-15 | 宝钢特钢有限公司 | A kind of superhigh intensity armor manufacture method |
| CN106086655B (en) * | 2016-08-17 | 2017-12-08 | 南京工程学院 | A kind of anti-collision hot forming martensite steel for being advantageous to optimize retained austenite |
| KR101899687B1 (en) | 2016-12-22 | 2018-10-04 | 주식회사 포스코 | Wear resistant steel having high hardness and method for manufacturing same |
| CN113073257A (en) * | 2021-03-11 | 2021-07-06 | 南京精锋制刀有限公司 | Formula and preparation method of HMJ metal material |
| CN113528974B (en) * | 2021-06-18 | 2022-06-21 | 首钢集团有限公司 | Steel for protection and preparation method thereof |
| CN114774800B (en) * | 2022-04-19 | 2023-08-08 | 河南科技大学 | Ultrahigh-strength high-plasticity and toughness martensitic steel and preparation method thereof |
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