CN101624681B - Ultra-high strength bainite armour steel and manufacturing method thereof - Google Patents
Ultra-high strength bainite armour steel and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to ultra-high strength bainite armour steel and a manufacturing method thereof. The technical proposal is as follows: the casting billet comprises the following chemical components: 0.70-1.10wt% of C, 1.20-1.80wt% of Si, 1.60-2.20wt% of Mn, 1.00-1.60wt% of Cr, 0.10-0.60wt% of Mo, 0.05-1.20wt% of Al, 0.05-0.50wt% of Co, P less than 0.015wt%, S less than 0.010wt% and the balance Fe and inevitable impurities. The method is characterized by carrying out die casting or continuous casting after steel making and refining; soaking the casting billet at the temperature of 1150-1250 DEG C for 2.0-3.0h, hot rolling and cooling the casting billet; austenitizing the casting billet at the temperature of 850-1050 DEG C for 0.2-0.6h; then insulating the casting billet at the temperature of 200-500 DEG C in the nitrogen atmosphere for 10.0-240.0h, or insulating the casting billet at the temperature of 200-500 DEG C in the nitrogen atmosphere and in the strong magnetic field of 8-12T for 1.0-4.0h and cooling the casting billet. The invention has the characteristics of low cost and simple process, and the manufactured steel plates have good properties.
Description
Technical field
The invention belongs to the armour steel technical field.Be specifically related to a kind of ultra-high strength bainite armour steel and manufacture method thereof.
Background technology
Armor types comprises the armoring compound armor that constitutes of steel armor, aluminum alloy armor, titanium alloy armor, composite armor, ceramic armour, explosive reactive armor (ERA) and multiple material.At present, to the intensity of armour material, hardness, notch shock toughness with anti-ly play ultimate research and all obtained very big progress, but there are the following problems:
(1) present, though the armor steel kind is many, be essentially medium carbon alloy steel, if want to continue to improve hardness, though the also corresponding raising of intensity, its impelling strength and fracture toughness property etc. sharply reduce, so that can not bear the impact load of shell huge energy, produce cracked and avalanche; Manufacturing process complexity, cost are too high, and comprehensive mechanical performance is not good especially.As " a kind of multiple layer armor protection system " (CN101216272), " armour material " (CN1037321), " method of manufacture and use thereof of multipurpose armour plate " (CN1461937), " armor plate " (CN1952587), " tensile strength is higher than hot rolling martensite steel plate and the manufacture method thereof of 1000MPa " patented technology such as (CN101008066).
(2) for aluminum alloy armor, the hardness that is fit to the armored vehicle use is bigger, ruptures but be subjected to stress corrosion easily; The fracture strength of aluminium will be lower than steel armor, and also easier " scabbing ", in addition, the fusing point of aluminium will be lower than steel, and particle that is at high temperature softening easily and aluminium burns easily.As " a kind of aluminium base copper alloy tank board heat treating process " (CN100999809), " a kind of aluminium base copper alloy tank board heat processing technique " (CN100999798), " a kind of smart steel cast aluminium armored door " patented technology such as (CN201125637).
(3) for titanium alloy armor, under some loading condition, because bullet only need consume few energy and just can cause the shear fails crackle and form fatal bear building-up, this defective can not be ignored; Costing an arm and a leg of titanium, the use on armored fighting vehicle has been subjected to the restriction of cost.As " high-strength, high-tenacity titanium alloy " (CN1031569), " the titanium alloys making method that the titaniferous amount is high " (CN1044958), " high strength titanium alloy and preparation method thereof " (CN1639366), " High-Strength Low-Alloy titanium alloy and manufacture method thereof " patented technology such as (CN1530454).
(4) for composite armor, the obvious cracking and the demixing phenomenon in big zone can appear in the abutting edge of armoring panel and backboard, cause plate armour more losing the ability that continues anti-bullet in the large area region, thereby influenced the ability of armoring anti-multiple bullet greatly, aspect bulletproof performance, shown tangible deficiency.As " composite armor panel " (CN1278324), " the shellproof load armor plate of a kind of matrix material " (CN2573990), " armor-plating composite " (CN1429148), " a kind of ceramic ball/resin composite material armour and preparation method thereof " patented technology such as (CN1948888).
(5) for the stupalith plate armour, since too crisp, the fracture toughness extreme difference, because its friability, armour material does not also possess to bear and repeatedly hits the ability that runs through, and this technology production process complexity, link is many, production cost is high, and they only are used for constituting the integral part of armor system usually.As " preparation method of lightweight norbide armor ceramic " (CN1541981), " production method of the compound material of metal oxide, metal oxide composite material powder end and stupalith " (CN1049485), " nitride-based ceramic material " (CN85101384), " new ceramic material and preparation method thereof " patented technology such as (CN85101457).
(6) for not thermal treatment or few heat treated air-colled bainite steel armor, be organized as the bainite/martensite heterogeneous structure, fracture toughness property is lower than the tempered martensite under the identical yield strength, and intensity is not high especially, and toughness neither be good especially.As " middle low Carbon Manganese series air-cooled bainitic steels " (CN1477226), " middle carbon and medium high carbon manganese series air-cooled bainitic steels " (CN1477225), " multielement micro-alloyed air cooled bainitic steel " (CN1189542), " air-cooled bainite steel with high toughness and high quenching performance " (CN1078269), " middle carbon air-cooled Mn/B bainitic steel " (CN86103008), " medium high carbon air-cooled Mn/B bainitic steel " (CN86103009), " low carbon air cooled nodular bainite steel " patented technology such as (CN85100080).
(7) for (surpassing) the low-carbon bainite steel armor in general, carbon content is not high, main alloy element Si, Mn, Cr, Mo content are few, bainite transformation temperature height, this technology interalloy Al, Co content seldom or do not have, bainite transformation is chronic, the production process complexity, link is many, production cost is high; Tough, plasticity is good, but intensity generally is no more than 1500MPa.As " low-carbon bainite steel and preparation method thereof " (CN101104906), " a kind of preparation method of ultra high temperature bainitic steel in ultralow carbon " (CN1916195), " high tensile strength high toughness low yield ratio bainite steel and production method thereof " (CN1786246), " a kind of ultra-low-carbon bainite steel and production method thereof " (CN1521285), " a kind of high-strength micro-alloy low-carbon bainite steel and production method thereof " (CN101230444), " improved non-carbide bainitic steel and production method thereof " (CN1175980), " bainite steel of high strength and tenacity " patented technology such as (CN1036231).
By above-mentioned analysis as can be seen:
(1) various armour materials all are that high intensity levels (1000～1500MPa), then do not see and relate to by the superstrength rank.
(2) various armour materials adopt valuable alloying element Ni or Ti etc., cost of alloy height.
(3) intensity of various armour materials, toughness and extension property are difficult to coupling simultaneously.
(4) manufacturing of various armour materials and complete processing complexity.
Summary of the invention
The present invention is intended to overcome above-mentioned technological deficiency, and purpose provides that a kind of with low cost, technology is simple, the ultra-high strength bainite armour steel and the manufacture method thereof of excellent property.
For achieving the above object, the technical solution used in the present invention is: or with molten iron or with steel scrap or with molten iron and steel scrap after steel-making and refining, carry out die casting or continuous casting, hot rolling and thermal treatment.
The chemical ingredients and the content thereof of strand are: C is 0.70～1.10wt%, Si is 1.20～1.80wt%, Mn is 1.60～2.20wt%, Cr is 1.00～1.60wt%, and Mo is 0.10～0.60wt%, and Al is 0.05～1.20wt%, Co is 0.05～0.50wt%, P＜0.015wt%, S＜0.010wt%, all the other are Fe and unavoidable impurities.
Described Si, Mn, Cr, Mo, Al and the Co content sum in strand is less than 6.00wt%.
Described hot rolling and process of thermal treatment are: earlier with strand soaking 2.0～3.0 hours under 1150～1250 ℃ of conditions, hot rolling, naturally cooling; Again with cooled steel plate austenitizing 0.2～0.6 hour under 850～1050 ℃ of conditions; Under 200～500 ℃ of conditions He in the nitrogen atmosphere, be incubated 10.0～240.0 hours then, cool to room temperature with the furnace, or insulation 1.0 hours～4.0 hours under the condition of 200～500 ℃, nitrogen atmosphere and 8～12T high-intensity magnetic field, cool to room temperature with the furnace.
Because adopt technique scheme, the present invention is based on cheap Si, Mn, Cr element, has only elements such as a spot of Mo, Co, Al, so with low cost; With the hot rolling and the process of thermal treatment of rolling+normalizing+quenching, technology is simple.
The microstructure of the armor steel of manufacturing of the present invention is that the bainite ferrite lath of nano level (20～40nm thickness) is a matrix, the distributing super fine organization of retained austenite of disperse.Bainite ferrite is the sosoloid of supersaturation carbon, is similar to martensitic stucture, has very high toughness and breaking resistance; Austenite is the toughness phase, be distributed on the bainite ferrite lath or between the lath, be subjected under the external force effect viscous deformation taking place, absorb and consumed energy, delay the expansion of crackle, extremely beneficial to the toughness that improves sheet material, stress can undergo phase transition induced plasticity effect (TRIP effect) when big, has further improved the toughness of steel.Because of the solution strengthening of carbon, dislocations strengthening, lath of bainite reinforcement, induced plasticity reinforcement etc., make the mechanical property of bainite armour steel can reach higher intensity rank in rolling attitude.
Handle through Overheating Treatment and high-intensity magnetic field, the stable state high-intensity magnetic field can contactlessly be delivered to high-intensity energy the atomic scale of material, change arrangement, coupling and the migration etc. of atom, can quicken the transformation of bainite, thereby the tissue and the performance of bainite exerted an influence.Thereby obtain tensile strength and be 1700～2300MPa, hardness and be 530～680HV, unit elongation and be 17～26% and fracture toughness be 26～35MPam
1/2The ultra-high strength bainite armour steel.
Therefore, the present invention has with low cost and the technology characteristic of simple, prepared plate property is good, be widely used in destroying enemy plane, attacker, bomber, armed helicopter and tank, armored vehicle and naval vessels etc. manufacturing and use steel plate, also can be applicable to manufacturing steel plates such as the explosion-proof vehicle of public security, armoured van.
Embodiment
Below in conjunction with embodiment the present invention being further described, is not limiting the scope of the invention.
Embodiment 1
A kind of manufacture method of ultra-high strength bainite armour steel.The chemical ingredients and the content thereof of strand are: C is 0.90～1.10wt%, Si is 1.50～1.80wt%, Mn is 1.60～1.90wt%, Cr is 1.30～1.60wt%, Mo is 0.30～0.60wt%, and Al is 0.05～0.60wt%, and Co is 0.05～0.20wt%, P＜0.015wt%, S＜0.010wt%, all the other are Fe and unavoidable impurities.Wherein: Si, Mn, Cr, Mo, Al and the Co content sum in strand is less than 6.00wt%.
Molten iron after steel-making and refining, is carried out die casting, hot rolling and thermal treatment.Hot rolling and process of thermal treatment are: earlier with strand soaking 2.0～3.0 hours under 1200～1250 ℃ of conditions, hot rolling, naturally cooling; Again with cooled steel plate austenitizing 0.4～0.6 hour under 850～950 ℃ of conditions; In nitrogen atmosphere down and under 200～350 ℃ of conditions, be incubated 120.0～240.0 hours, cool to room temperature with the furnace then.
The ultra-high strength bainite armour steel of present embodiment manufacturing: tensile strength is 2100～2300Mpa; Hardness is 650～680HV; Unit elongation is 21～24%; Toughness is 28～32MPam
1/2
Embodiment 2
A kind of manufacture method of ultra-high strength bainite armour steel.The chemical ingredients and the content thereof of strand are: C is 0.90～1.10wt%, Si is 1.50～1.80wt%, Mn is 1.60～1.90wt%, Cr is 1.30～1.60wt%, and Mo is 0.30～0.60wt%, and Al is 0.60～1.20wt%, Co is 0.20～0.50wt%, P＜0.015wt%, S＜0.010wt%, all the other are Fe and unavoidable impurities.Wherein: Si, Mn, Cr, Mo, Al and Co strand in the content sum less than 6.00wt%.
Steel scrap after steel-making and refining, is carried out continuous casting, hot rolling and thermal treatment.Hot rolling and process of thermal treatment are: earlier with strand soaking 2.0～3.0 hours under 1200～1250 ℃ of conditions, hot rolling, naturally cooling; Again with cooled steel plate austenitizing 0.4～0.6 hour under 850～950 ℃ of conditions; Insulation 2.0 hours～4.0 hours under the condition of 200～350 ℃, nitrogen atmosphere and 10～12T high-intensity magnetic field then cools to room temperature with the furnace.
The ultra-high strength bainite armour steel of present embodiment manufacturing: tensile strength is that 2000～2200MPa, hardness are that 610～640HV, unit elongation are 17～20%, toughness is 26～30MPam
1/2
Embodiment 3
A kind of manufacture method of ultra-high strength bainite armour steel.The chemical ingredients and the content thereof of strand are: C is 0.70～0.90wt%, Si is 1.20～1.50wt%, Mn is 1.90～2.20wt%, Cr is 1.00～1.30wt%, and Mo is 0.10～0.30wt%, and Al is 0.05～0.60wt%, Co is 0.05～0.20wt%, P＜0.015wt%, S＜0.010wt%, all the other are Fe and unavoidable impurities.Wherein: Si, Mn, Cr, Mo, Al and Co strand in the content sum less than 6.00wt%.
Molten iron and steel scrap after steel-making and refining, are carried out continuous casting, hot rolling and thermal treatment.Hot rolling and process of thermal treatment are: earlier with strand soaking 2.0～3.0 hours under 1150～1200 ℃ of conditions, hot rolling, naturally cooling; Again with cooled steel plate austenitizing 0.2～0.4 hour under 950～1050 ℃ of conditions; In nitrogen atmosphere down and under 350～500 ℃ of conditions, be incubated 10.0～120.0 hours, cool to room temperature with the furnace then.
The ultra-high strength bainite armour steel of present embodiment manufacturing: tensile strength is 1800～2000MPa; Hardness is 570～600HV; Unit elongation is 23～26%; Toughness is 30～34MPam
1/2
Embodiment 4
A kind of manufacture method of ultra-high strength bainite armour steel.The chemical ingredients and the content thereof of strand are: C is 0.70～0.90wt%, Si is 1.20～1.50wt%, Mn is 1.90～2.20wt%, Cr is 1.00～1.30wt%, and Mo is 0.10～0.30wt%, and Al is 0.60～1.20wt%, Co is 0.20～0.50wt%, P＜0.015wt%,＜0.010wt%, all the other are Fe and unavoidable impurities.Wherein: Si, Mn, Cr, Mo, Al and Co strand in the content sum less than 6.00wt%.
Molten iron after steel-making and refining, is carried out die casting, hot rolling and thermal treatment.Hot rolling and process of thermal treatment are: earlier with strand soaking 2.0～3.0 hours under 1150～1200 ℃ of conditions, hot rolling, naturally cooling; Again with cooled steel plate austenitizing 0.2～0.4 hour under 950～1050 ℃ of conditions; Insulation 1.0 hours～3.0 hours under the condition of 350～500 ℃, nitrogen atmosphere and 8～10T high-intensity magnetic field then cools to room temperature with the furnace.
The ultra-high strength bainite armour steel of present embodiment manufacturing: tensile strength is 1700～1900MPa; Hardness is 530～560HV; Unit elongation is 9～22%; Toughness is 32～35MPam
1/2
This embodiment is based on cheap Si, Mn, Cr element, has only elements such as a spot of Mo, Co, Al, so with low cost; With the hot rolling and the process of thermal treatment of rolling+normalizing+quenching, technology is simple.
The microstructure of the armor steel of this embodiment manufacturing is that the bainite ferrite lath of nano level (20～40nm thickness) is a matrix, the distributing super fine organization of retained austenite of disperse.Bainite ferrite is the sosoloid of supersaturation carbon, is similar to martensitic stucture, has very high toughness and breaking resistance; Austenite is the toughness phase, be distributed on the bainite ferrite lath or between the lath, be subjected under the external force effect viscous deformation taking place, absorb and consumed energy, delay the expansion of crackle, extremely beneficial to the toughness that improves sheet material, stress can undergo phase transition the induced plasticity effect when big, has further improved the toughness of steel.Handle through Overheating Treatment and high-intensity magnetic field, obtain tensile strength and be 1700～2300MPa, hardness and be 530～680HV, unit elongation and be 17～26% and fracture toughness be 26～35MPam
1/2The ultra-high strength bainite armour steel.
Therefore, the present invention has with low cost and the simple characteristics of technology, prepared plate property is good, be widely used in destroying enemy plane, attack plane, bomber, armed helicopter and tank and armored vehicle and naval vessels etc. manufacturing and use steel plate, also can be applicable to the manufacturing steel plates such as public security explosion-proof vehicle, armoured van.
Claims (2)
1. the manufacture method of a ultra-high strength bainite armour steel, it is characterized in that or with molten iron with steel scrap or with molten iron and steel scrap after steel-making and refining, carry out die casting or continuous casting, hot rolling and thermal treatment;
The chemical ingredients and the content thereof of strand are: C is 0.70～1.10wt%, Si is 1.20～1.80wt%, Mn is 1.60～2.20wt%, Cr is 1.00～1.60wt%, and Mo is 0.10～0.60wt%, and Al is 0.05～1.20wt%, Co is 0.05～0.50wt%, P＜0.015wt%, S＜0.010wt%, all the other are Fe and unavoidable impurities;
Described hot rolling and process of thermal treatment are: earlier with strand soaking 2.0～3.0 hours under 1150～1250 ℃ of conditions, hot rolling, naturally cooling; Again with cooled steel plate austenitizing 0.2～0.6 hour under 850～1050 ℃ of conditions; Under 200～500 ℃ of conditions, in nitrogen atmosphere, be incubated 10.0～240.0 hours then, cool to room temperature with the furnace, or insulation 1.0 hours～4.0 hours under the condition of 200～500 ℃, nitrogen atmosphere and 8～12T high-intensity magnetic field, cool to room temperature with the furnace;
Described Si, Mn, Cr, Mo, Al and the Co content sum in strand is less than 6.00wt%.
2. the ultra-high strength bainite armour steel of the manufacture method manufacturing of ultra-high strength bainite armour steel according to claim 1.
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| US20120240755A1 (en) * | 2011-03-23 | 2012-09-27 | Spokane Industries | Ballistic applications of composite materials |
| US8985185B2 (en) | 2011-03-23 | 2015-03-24 | Spokane Industries | Composite components formed with loose ceramic material |
| CN103451549B (en) * | 2013-09-17 | 2016-05-25 | 北京科技大学 | A kind of 2100MPa nanometer bainitic steel and preparation method thereof |
| CN104674121B (en) * | 2015-03-10 | 2017-03-08 | 山东钢铁股份有限公司 | A kind of high elastoresistance armour plate and its manufacture method |
| KR101736638B1 (en) * | 2015-12-23 | 2017-05-30 | 주식회사 포스코 | Pressure vessel steel plate with excellent hydrogen induced cracking resistance and manufacturing method thereof |
| CN106119704A (en) * | 2016-06-23 | 2016-11-16 | 武汉科技大学 | High strength and ductility nanostructured bainitic steel for the crashproof parts of body of a motor car |
| CN107227432B (en) * | 2017-05-26 | 2018-09-07 | 中北大学 | A kind of high-strength tenacity nanoscale Multiphase Steel and preparation method thereof |
| CN109930069B (en) | 2019-03-28 | 2019-12-24 | 北京科技大学 | Manufacturing method of light steel plate with ultrahigh strength and high toughness |
| CN110079733B (en) * | 2019-05-16 | 2020-04-21 | 武汉科技大学 | Ultra-thin ultra-high strength medium carbon bainite steel and manufacturing method thereof |
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