CN101270439A - High-strength hot-rolled armor plate and method for manufacturing same - Google Patents
High-strength hot-rolled armor plate and method for manufacturing same Download PDFInfo
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- CN101270439A CN101270439A CNA200710038387XA CN200710038387A CN101270439A CN 101270439 A CN101270439 A CN 101270439A CN A200710038387X A CNA200710038387X A CN A200710038387XA CN 200710038387 A CN200710038387 A CN 200710038387A CN 101270439 A CN101270439 A CN 101270439A
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Abstract
The invention discloses a hot-rolled armor plate with high strength and a fabrication method. The steel plate has the following components in weight percent: 0.15 to 0.22 percent of Carbon, 0.2 to 0.6 percent of Silicon, 1.6 to 2.2 percent of Manganese, greater than or equal to 0.035 percent of Phosphorus, less than or equal to 0.01 percent of Sulfur, 0.020 to 0.06 percent of Aluminum, less than or equal to 0.006 percent of Nitrogen, 0.025 to 0.15 percent of Titanium, smaller than 0.3 percent of Copper, less than or equal to 0.055 percent of Niobium and/or less than or equal to 0.015 percent of Vanadium, or one or several kinds of smaller than 0.3 percent of Chromium, smaller than 0.3 percent of Molybdenum, smaller than 0.2 percent of Nickel, smaller than 0.0050 percent of Calcium and smaller than 0.0025 percent of Boron, the remaining part is Ferrum and other evitable purities. The fabrication method is carried out as follows: the steel blank is heated at 1150 to 1250 DEG C and hot-rolled, the deformation amount of rolling is higher than 80 percent, the finishing temperature is 830 to 900 DEG C, the steel plate is cooled to 460 to 560 DEG C in the cooling speed of 20 DEG C per second and rolled, then is air-cooled to room temperature.
Description
Technical field
The invention belongs to steel manufacturing technology field, be specifically related to a kind of 900MPa above high-strength hot-rolled armor plate and manufacture method thereof of need not heat treated tensile strength reaching.
Background technology
Ballproof cash truck and other bullet-proof car, as mobile bank's car, private bullet-proof sedan, alert with shellproof cruiser, anti-riot car, arrange sudden and violent car etc., shellproof be their the most basic requirements.Generally adopt armour plate as the protection critical material for reaching shellproof purpose.
The topmost function of armour plate is to stop the penetration of bullet to steel plate, and the thickness that increases steel plate increases the required energy of bullet penetration steel plate, is a kind of effective ways that improve the steel plate bulletproof performance, but this will increase light weight minimizing vehicle payload capacity.Therefore the thickness of armour plate has the trend of attenuate, and the used armour plate thickness of ballproof cash truck is generally 3.0mm.China's armoured van armour plate must satisfy corresponding protection condition among the GA164-1997 " special-purpose armoured van guard technology condition " at present.
Raising armor plate strength and hardness increase the energy that bullet penetration steel plate is consumed, thereby help the raising of bulletproof performance.The quenching heat treatment that adopts armour plate on the market effectively improves the intensity and the hardness of steel plate more, and tensile strength is more than 1500Mpa.The thermal treatment bullet proof steel be organized as tempered martensite, the alloying aspect adopts Cr-Mo system to guarantee the hardening capacity of steel plate, adds Ni to improve the toughness of steel plate.
The armour plate palpus process quenching of russian patent RU2015491C1 and 140～170 ℃ low-temperaturetempering.
Japanese Patent JP11264050 armour plate is the middle carbon nickel-molybdenum steel of quenching and low-temperaturetempering.
Japanese Patent JP2004137579 armour plate is must be through heat treated high-carbon (0.7～1.8%) Gao Meng (8～16%) steel.
European patent EP 1152207A2 hot-rolled armor plate is the heat treated abrasive austenic high mangaenese steel of a kind of process, carbon content 1.1～1.3%, manganese content 11.5～13.5%.
(the achievement numbering: 0100390052) armor plating is middle carbon Mn-Cr-Ni-Mo low alloy steel, and the steel plate after the hot rolling must be through thermal treatment, and armor plate strength reaches 1600MPa in " development of high-performance armor plating " in " CSTAD ".
Superstrength bullet proof steel GK901 among " design of ballproof cash truck collision bumper and manufacturing " (southern metal Sum.135 December 2003p12-13) is a medium carbon low alloy steel, also will be through thermal treatment.
The armoured van bullet proof steel generally is not more than 3mm, and the armor plate strength high-ductility that adds low-temperaturetempering through quenching is low, and plate shape and cold-forming property are poor, and heat affected zone, welding back intensity reduces ballistic performance and also will decrease; Contained more Cr, alloying elements such as Mo, Ni in the steel are again through treatment production cost height.
Domestic new disclosed a kind of hot-rolled armor plate patent application (CN200510023888) is that silicon content needs segmentation refrigerative hot-rolled steel sheet after than higher (1.5～2.2%) hot rolling, needs stronger cooling power and lower final cooling temperature (350～450 ℃) during production.This armour plate is a hot-rolled product, though do not need through thermal treatment, but steel plate must be through the segmentation controlled chilling of strictness after the hot rolling, the laminar flow cooling apparatus is required comparatively harsh, not only temperature and time is wanted precise control, and need stronger cooling power and lower final cooling temperature, be difficult to reach at the laminar flow cooling apparatus of general hot rolling line.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of without thermal treatment, can directly cool off after the hot rolling, with the high-strength hot-rolled armor plate and the manufacture method thereof of general hot rolling line energy direct production.
Technical scheme of the present invention is:
A kind of high-strength hot-rolled armor plate, its design mix are (weight %):
0.15～0.22%C, 0.2～0.6%Si, 1.6～2.2%Mn ,≤0.035%P ,≤0.010%S, 0.020～0.060%Al ,≤0.0060%N, 0.025～0.15%Ti,＜0.3%Cu, adding≤0.055%Nb or≤0.15%V or Nb and V add simultaneously; Under also can adding in the column element one or more:＜0.3%Cr,＜0.3%Mo,＜0.2%Ni,＜0.0050%Ca,＜0.0025%B, all the other are Fe and unavoidable impurities.
More than the effect of each alloying element be:
C: be used to guarantee the intensity rank of steel, be the principal element that improves armor plate strength yet, C too low strength does not reach requirement, and C is too high unfavorable to welding property.
Si: play the solution strengthening effect in steel, the too high surface of steel plate that makes easily produces surface imperfection such as red iron sheet.
Mn: be the solution strengthening element, be lower than the undercapacity of 1.6% steel, too high meeting descends the plasticity of steel.
P, S: be the impurity element in the steel, content should be low more good more.
Al: be the deoxidant element in the steel, reduce oxide inclusion, pure steel in the steel, help improving the forming property of steel plate.
Nb, Ti, V: be effective crystal grain thinning, improve intensity and flexible element, be present in the steel with the form of carbide and carbonitride, it is little that add-on is lower than 0.01% strengthening effect.
Cr, Ni, Cu: can improve the corrosion resistance nature of steel plate except that improving armor plate strength, Ni can also eliminate the high-temperature brittleness that Cu causes.
Mo, B: help the transformation of bainite, improve the intensity of steel plate.
Ca: can change the form of sulfide in the steel, improve the plasticity and the toughness of steel plate.
Bullet proof steel must have enough intensity to resist the penetration of bullet, though the armor plate strength high plasticity add low-temperaturetempering of quenching is low, cold-forming property is poor, and welding back intensity reduces.If steel plate has certain plasticity and toughness when having certain intensity, the kinetic energy that utilizes these performances to produce viscous deformation consumption bullet when bullet penetration steel plate can improve the bulletproof performance of steel plate.The present invention adopts soft steel to add alloying elements such as manganese, niobium, vanadium, titanium, and intensity and toughness with methods such as solution strengthening, precipitation strength and refined crystalline strengthening raising steel plate make steel plate have forming property and bulletproof performance preferably.
The manufacture method of hot-rolled armor plate of the present invention is: steel billet is after 1150～1250 ℃ of heating, be rolled in the austenitic area, rolling reduction is greater than 80%, 830～900 ℃ of finishing temperatures, steel plate after the finish to gauge is as cold as 460～560 ℃ with the above speed of cooling of 20 ℃/s and batches, and air cooling is to room temperature then.
Being described as follows of processing condition in the above manufacture method:
Heating temperature is lower than 1150 ℃, and the microalloy element dissolving is insufficient, fails to make full use of the effect of microalloy element, and intensity reduces.Be higher than 1250 ℃ of easy alligatoring of crystal grain, unfavorable to improving steel plate toughness.
Slab carries out roughing in the crystal boundary area again at austenite, by the recrystallize refine austenite crystal grain behind the rolling deformation, the deflection of steel plate is more than 80%, finishing temperature is controlled at 830～900 ℃ in austenite non-recrystallization district, rolling deformation by the austenite cold zone, the carbonitride precipitation that makes the austenite crystal intragranular form deformation bands and bring out microalloy element in response to change, the phase-change product of refine austenite, the toughness of raising steel plate.
Steel plate is cooled to 460～560 ℃ with the above speed of cooling of 20 ℃/s and batches after the finish to gauge, and coiling temperature is higher than 560 ℃ of steel plates and exists the pearlitic structure armor plate strength low, is unfavorable for improving elastoresistance.Batch the back air cooling to room temperature.
Beneficial effect of the present invention is as follows:
The present invention a kind ofly need not after modified thermal treatment, hot rolling need not complicated process for cooling can to make the tensile strength of steel plate to reach hot-rolled armor plate and manufacture method thereof more than the 900MPa, this steel plate has good bulletproof performance, processability, is mainly used in the armoured van armour plate.
Hot-rolled high-strength armour plate of the present invention, alloy content lacks than the thermal treatment armour plate, again without thermal treatment, so low cost of manufacture; Need not complicated controlled cooling technology after the hot rolling, just can realize, be easy to produce with general laminar flow cooling technology.
Armour plate hot rolling postcooling technology of the present invention is simple, performance is even, plate shape is good, have good cold-forming property and welding property, production cost is low, and its ballistic performance satisfies GA164-1997 " special-purpose armoured van guard technology condition " A level ballistic standard, and it is shellproof to can be used for armoured van.
Steel plate of the present invention has intensity and flexible coupling preferably, and cold-forming property is better than thermal treatment steel plate, and steel plate welding back intensity does not reduce, so bulletproof performance does not descend.
Description of drawings
Fig. 1 is the raw sheet gunslinging photo of steel plate of the present invention;
Fig. 2 is the weld seam of steel plate of the present invention and the gunslinging photo of heat affected zone.
Embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing.
Embodiment:
The present invention selects the steel billet with listed chemical ingredients of A～G in the table 1 respectively for use, through smelting, forging, rolling, promptly adopt after 1150～1250 ℃ of heating, be rolled in the austenitic area, rolling reduction is greater than 80%, 830～900 ℃ of finishing temperatures, steel plate after the finish to gauge is as cold as 460～560 ℃ with the above speed of cooling of 20 ℃/s and batches, air cooling is to the manufacture method of room temperature then, press listed finishing temperature of A～G and coiling temperature CONTROL PROCESS condition in the table 3 when rolling respectively, make thus and obtain A～G hot-rolled high-strength armour plate.
Table 1 be need not heat treated test steel chemical ingredients, wherein A～G steel is the embodiment of steel of the present invention, the H steel is the comparative steel of CN200510023888.Can find out from table 1, the chemical ingredients of steel of the present invention and the comparative steel of CN200510023888 have some differences, si content is lower than CN200510023888, has increased alloying constituents such as V, Ni, Cr, Mo, Cu, B in the steel of the present invention to improve the intensity and the toughness of steel plate.
Table 2 is the chemical ingredientss that adopt other patent steel plate of thermal treatment process.Can find out that from table 2 adopting the high carbon high manganese steel of thermal treatment process and middle carbon nickel-molybdenum steel all to hang down manganese content with the low-carbon (LC) of steel of the present invention has tangible difference; The carbon manganese content of steel of the present invention lacks than the thermal treatment armour plate, again without thermal treatment, so low cost of manufacture.
Table 2 adopts the chemical ingredients of heat-treated steel plate
| The patent No. | C | Si | Mn | Ni | Cr | Mo | Nb | Ti | W | B | Co |
| EP1152207A2 | 1.10- 1.30 | 0.25- 0.50 | 11.5- 13.5 | ≤ 0.50 | |||||||
| JP2004137579 | 0.7- 1.6 | ≤0.8 | 8-16 | 0.1- 1.5 | 0.1- 1.0 | 0.1- 2.0 | |||||
| JP11264050 | 0.3- 0.6 | 0.03- 0.15 | ≤0.5 | 2.0- 5.0 | 0.2- 5.0 | 1- 5.0 | 0.01- 0.02 | 0.01- 0.02 | 0.05- 0.3 | 0.0005- 0.005 | 3- 10 |
Processing condition and the gained thickness controlled when table 3 is the test steel rolling are the mechanical property of the steel plate of 3mm, and wherein, the test of mechanical property is undertaken by the GB6397-86 standard, and comparative example is the armour plate of CN200510023888 patent application.
The technology and the mechanical property of table 3 test steel
| Grade of steel | Finishing temperature (℃) | Coiling temperature (℃) | Yield strength (MPa) | Tensile strength (MPa) | Unit elongation *(％) | Remarks |
| A | 882 | 460 | 867 | 1079 | 19 | Embodiment |
| A | 891 | 504 | 725 | 937 | 16 | Embodiment |
| B | 900 | 519 | 760 | 1022 | 18 | Embodiment |
| B | 880 | 530 | 741 | 1006 | 19 | Embodiment |
| C | 885 | 490 | 875 | 945 | 16 | Embodiment |
| D | 864 | 560 | 840 | 937 | 18 | Embodiment |
| E | 860 | 553 | 754 | 970 | 17 | Embodiment |
| E | 830 | 517 | 815 | 990 | 15 | Embodiment |
| F | 860 | 545 | 836 | 924 | 15 | Embodiment |
| G | 878 | 530 | 840 | 1030 | 17 | Embodiment |
| H | 900 | 440 | 640 | 1120 | 13 | Comparative example |
*Embodiment tension specimen gauge length is 5.65
S0 is the sample sectional area, and comparative example tension specimen parallel portion is wide to be 20mm, gauge length 80mm.
Can find out from table 3, adopt of the present invention the need to cool off but direct refrigerative manufacture method without segmentation after thermal treatment, the hot rolling, can produce tensile strength and reach the above high-strength hot-rolled armor plate of 900MPa, the ductility of gained steel plate and do not need thermal treatment equally but need segmentation refrigerative CN200510023888 steel plate suitable, have better intensity and flexible coupling, and be easy to produce.
Fig. 1 is the raw sheet gunslinging photo of steel plate of the present invention, and Fig. 2 is the weld seam of steel plate of the present invention and the gunslinging photo of heat affected zone, and gunslinging is undertaken by GA164-1997 " special-purpose armoured van guard technology condition ".Can find out that from Fig. 1, Fig. 2 steel plate of the present invention has good bulletproof performance, processability, can be used for the armoured van armour plate; Have intensity and flexible coupling preferably, steel plate welding back intensity does not reduce, and bulletproof performance does not descend.
Claims (3)
1. high-strength hot-rolled armor plate, it is characterized in that, its chemical ingredients comprise (weight %): 0.15～0.22%C, 0.2～0.6%Si, 1.6～2.2%Mn ,≤0.035%P ,≤0.010%S, 0.025～0.060%Al ,≤0.0060%N, 0.025～0.15%Ti,＜0.3%Cu, adding≤0.055%Nb or≤0.15%V, or Nb and V add simultaneously
All the other are Fe and unavoidable impurities.
2. high-strength hot-rolled armor plate according to claim 1, its feature also be, adds in the column element down one or more:＜0.3%Cr,＜0.3%Mo,＜0.2%Ni,＜0.0050%Ca,＜0.0025%B.
3. manufacture method as the described high-strength hot-rolled armor plate of claim 1-2, it is characterized in that, steel billet is after 1150～1250 ℃ of heating, be rolled in the austenitic area, rolling reduction is greater than 80%, 830～900 ℃ of finishing temperatures, the steel plate after the finish to gauge is as cold as 460～560 ℃ with the above speed of cooling of 20 ℃/s and batches, and air cooling is to room temperature then.
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| CNA200710038387XA CN101270439A (en) | 2007-03-23 | 2007-03-23 | High-strength hot-rolled armor plate and method for manufacturing same |
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| CNA200710038387XA CN101270439A (en) | 2007-03-23 | 2007-03-23 | High-strength hot-rolled armor plate and method for manufacturing same |
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| CN101818308B (en) * | 2009-02-27 | 2012-06-13 | 鞍钢股份有限公司 | Steel for longitudinal resistance welded pipe with low yield ratio and manufacturing method thereof |
| CN102776337A (en) * | 2012-08-21 | 2012-11-14 | 重庆大江工业有限责任公司 | Press quenching and processing method for 30 MnCrNiMo armored steel plate part |
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| CN108642380A (en) * | 2018-05-15 | 2018-10-12 | 首钢集团有限公司 | A kind of the shock wave resistance steel plate and its manufacturing method of 900MPa ranks |
| CN108796375A (en) * | 2018-06-28 | 2018-11-13 | 武汉钢铁有限公司 | A kind of tensile strength 1000MPa grades of hot-dip galvanized high-strength steels and its minimizing production method |
| CN113785078A (en) * | 2019-04-05 | 2021-12-10 | 瑞典钢铁技术有限公司 | High hardness steel product and method for manufacturing same |
| CN113785078B (en) * | 2019-04-05 | 2023-10-27 | 瑞典钢铁技术有限公司 | High hardness steel product and method for manufacturing same |
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