CN109852779A - A kind of heat treatment method of civilian bullet proof steel - Google Patents
A kind of heat treatment method of civilian bullet proof steel Download PDFInfo
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- CN109852779A CN109852779A CN201910160548.5A CN201910160548A CN109852779A CN 109852779 A CN109852779 A CN 109852779A CN 201910160548 A CN201910160548 A CN 201910160548A CN 109852779 A CN109852779 A CN 109852779A
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Abstract
The invention discloses a kind of heat treatment methods of civilian bullet proof steel, ingredient is carried out by weight percent according to the chemical element component of above-mentioned bullet proof steel, the smelting of molten steel is carried out using vacuum melting furnace, steel billet is made, heating steel billet to 1250 DEG C~1300 DEG C 6~8h of heat preservation is subjected to hammering, hammering is at setting thickness；By good 1280 DEG C~1330 DEG C of steel billet of hammering, 1h~2h is kept the temperature, is rolled after coming out of the stove, room temperature is air-cooled to after rolling, then carry out quenching+two-phase section quenching+tempering heat treatment process.Pass through civilian armour plate prepared by the technique, yield strength are as follows: 1350MPa~1480MPa, tensile strength 1550MPa~1750MPa, elongation percentage are as follows: 12%~14%, room temperature impact property (u notch): 55~60J, low temperature impact properties (- 40 DEG C, u notch): 30~38J, Brinell hardness HBS:450~550, bulletproof performance reach C grades of " cabinet or armour plate " in People's Republic of China (PRC) industry standards of public safety GA 164-2005.The protection requirements of the police light vehicles such as current ballproof cash truck, anti-terrorism, explosion-proof and peacekeeping vehicle can be met.
Description
Technical field
Steel material technical field of heat treatment of the present invention especially provides a kind of heat treatment method of civilian bullet proof steel.
Background technique
In recent years, more and more thin armour plates start the light-duty special vehicle being applied in civil field, such as anti-terrorism
Hoolivan, arms drover's car, ballproof cash truck etc..And most of armoring armour plate of China's independent development is applied to military neck
Domain, the application study in civil field is less, causes the most of civilian bullet proof steels in China by import, import is more to be
The Domax500 steel of Swedish Stell AB company, Sweden production, tensile strength are generally higher than 1500MPa, and have good
Toughness and defense of resistance to impact performance.
Currently, the high-strength hot-rolled armor plate of B900FD that China Car Engineering Academe and Baosteel are developed, Rp0.2: 700
~800Mpa, Rm are 900 hereinafter, A50%: 14~19%, for yield tensile ratio 0.8 or more, ballistic performance is preferable, but public security is also not achieved
C as defined in portion grades of level of protection is even more that can not match in excellence or beauty with Domax500 steel.Though the thin armoring bullet proof steel in China have it is high-intensitive,
High rigidity, and meet the requirement of C as defined in the Ministry of Public Security grades of level of protection, but its impact property is lower, especially low-temperature impact toughness,
Cause material to be easy to produce back avalanche by bullet impact under cryogenic, is not able to satisfy defense of resistance to impact demand.
Rare earth element, which is added in molten steel, has the effects that denaturation is mingled with, refines crystal grain, strengthens crystal boundary, and the impact of steel can be improved
Toughness, but the solid solution capacity of rare earth in steel is very few, mostly 10-6Hereinafter, being promoted to the low temperature impact properties of steel limited.And mistake
The rare earth of amount can generate the second phase of rare earth along crystal boundary, impact property is caused to significantly reduce.
Recently, obtained in terms of the application study using two-phase section quenching heat treatment technique in high strength steel it is certain at
Fruit, and some papers and patent have been published, and the double rare reports of quenching technical+tempering process of quenching+two-phase section quenching
Road, the technique are even more not have research in the application of bullet proof steel.
Summary of the invention
It is an object of the invention to solve the problems, such as existing thin armoring bullet proof steel high intensity, low tenacity, meeting protective
On the basis of energy, its impact property is promoted, meanwhile, a kind of heat treatment method of civilian bullet proof steel is provided, for overcoming tradition to mention
Rise the limitation of steel impact property technology.
The technical scheme is that a kind of heat treatment method of civilian bullet proof steel, the chemistry member that the bullet proof steel contains
Plain ingredient and its mass percent are as follows: C 0.26~0.36%；Si 0.2~0.4%；Mn 0.75~1.1%；Cr 0.75~
1.1%；Ni 1.8~2.2%；Mo 0.25~0.45%；V 0.15~0.25%；Nb 0.015~0.025%；P≤
0.015%；S≤0.01%；Re 0~0.01%；Remaining is the inevitable impurity of Fe element；
The heat treatment method are as follows: carry out ingredient by weight percent according to the chemical element component of above-mentioned bullet proof steel, adopt
The smelting that molten steel is carried out with vacuum melting furnace, is made steel billet, and heating steel billet to 1250 DEG C~1300 DEG C 6~8h of heat preservation is hammered into shape
Forging, hammering is at setting thickness；By good 1280 DEG C~1330 DEG C of steel billet of hammering, 1h~2h is kept the temperature, is rolled after coming out of the stove, after rolling
Be air-cooled to room temperature, then carry out quenching+two-phase section quenching+tempering heat treatment process, heat treatment the following steps are included:
(1) quench: by heating steel billet to 870~920 DEG C, the rate of heat addition is 10~15 DEG C/min, after keeping the temperature 1.5~2.5h
Oil is cooled to room temperature；
(2) two-phase section quenches: being heated to 730~780 DEG C, the rate of heat addition is that oil is cold after 10~15 DEG C/min keeps the temperature 1~2h
To room temperature；
(3) it is tempered: steel billet in (2) being again heated to 170~240 DEG C, is air-cooled to room temperature after keeping the temperature 3~4h.
Preferably, chemical element component and its mass percent that the bullet proof steel contains are as follows: C 0.35%；Si
0.3%；Mn 0.9%；Cr 1%；Ni 2%；Mo 0.3%；V 0.18%；Nb 0.02%；P≤0.01%；S≤0.01%；
RE 0.006%；Remaining is the inevitable impurity of Fe element.
The present invention has following beneficial effect:
(1) hardening heat is at 870~920 DEG C, and available uniform tiny austenite grain, structure of steel is plate after quenching
Strip martensite makes steel plate have high tensile strength and hardness.
(2) quenching is quenched using high temperature for the first time, can obtain a fairly large number of martensite, material on the one hand can be improved
Competency, on the other hand, the quenching of next step two-phase section, a large amount of martensites, which will decompose, is changed into ferrite, by the technique,
A considerable amount of martensitic structures can be still retained after transformation, ensure that the competency of material.
(3) on the basis of high temperature quenching technical, two-phase section quenching is carried out, hardening heat, can between Ac1~Ac3
The duplex structure of ferrite and martensite is obtained, in subsequent drawing process, high-plasticity ferritic phase does not change, and
Martensite transfor mation is the tempered structure of hard high intensity.Using the tissue matched well after ferrite and martenaging martempering, effectively
Ground improves the impact flexibility of steel, so that steel be made to obtain good toughness and tenacity.
(4) pass through civilian armour plate prepared by the technique, yield strength are as follows: 1350MPa~1480MPa, tension are strong
Spend 1550MPa~1750MPa, elongation percentage are as follows: 12%~14%, room temperature impact property (u notch): 55~60J, low-temperature impact
Performance (- 40 DEG C, u notch): 30~38J, Brinell hardness HBS:450~550, bulletproof performance reach People's Republic of China's public affairs
C grades of " cabinet or armour plate " in Safety Industry standard GA 164-2005 altogether.Current ballproof cash truck, anti-terrorism, explosion-proof can be met
And the protection requirements of the police light vehicle such as peacekeeping vehicle.
Detailed description of the invention
Fig. 1 is metallographic structure after the heat treatment of 1 light plate of embodiment.
Specific embodiment
Following embodiment is only some optimal embodiments of the present invention, is not had to aforementioned invention range and technological means
Any restrictions.
A kind of heat treatment method of civilian bullet proof steel, the chemical element component and its mass percent that bullet proof steel contains
Are as follows: C 0.35%；Si 0.3%；Mn 0.9%；Cr 1%；Ni 2%；Mo 0.3%；V 0.18%；Nb 0.02%；P≤
0.01%；S≤0.01%；RE 0.006%；Remaining is the inevitable impurity of Fe element.
Ingredient is carried out by weight percent according to the chemical component of above-mentioned bullet proof steel, and molten steel is carried out using vacuum melting furnace
It smelts, steel billet is made, heating steel billet to 1250 DEG C~1300 DEG C 6~8h of heat preservation is subjected to hammering, hammering is at setting thickness；It will hammer
1280 DEG C~1330 DEG C of the steel billet forged, 1h~2h is kept the temperature, is rolled after coming out of the stove, room temperature is air-cooled to after rolling, is then quenched
Fire+two-phase section quenching+tempering heat treatment, is sampled carry out performance evaluation on the steel plate handled.
Light plate of the embodiment of the present invention is heat-treated using chamber type electric resistance furnace, rated power 8KW, voltage rating
380V, 1350 DEG C of rated temperature, temperature uniformity error ± 4 DEG C.
Embodiment 1
(1) quench: by heating steel billet to 875 DEG C, the rate of heat addition is 10 DEG C/min, and oil is cooled to room temperature after keeping the temperature 1.5h.
(2) two-phase section quenches: being heated to 750 DEG C, the rate of heat addition is that oil is cooled to room temperature after 10 DEG C/min keeps the temperature 1h.
(3) it is tempered: steel billet in (2) being again heated to 175 DEG C, is air-cooled to room temperature after keeping the temperature 3h.
After above-mentioned heat treatment, the tissue of steel plate is ferrite+martensite, the performance test results in scope of design,
Bulletproof performance reaches C grades of " cabinet or armour plate " in People's Republic of China (PRC) industry standards of public safety GA 164-2005.
Embodiment 2
(1) quench: by heating steel billet to 885 DEG C, the rate of heat addition is 12 DEG C/min, and oil is cooled to room temperature after keeping the temperature 1.5h.
(2) two-phase section quenches: being heated to 760 DEG C, the rate of heat addition is that oil is cooled to room temperature after 10 DEG C/min keeps the temperature 1h.
(3) it is tempered: steel billet in (2) being again heated to 180 DEG C, is air-cooled to room temperature after keeping the temperature 3h.
After above-mentioned heat treatment, the tissue of steel plate is ferrite+martensite, the performance test results in scope of design,
Bulletproof performance reaches C grades of " cabinet or armour plate " in People's Republic of China (PRC) industry standards of public safety GA 164-2005.
Embodiment 3
(1) quench: by heating steel billet to 895 DEG C, the rate of heat addition is 10 DEG C/min, and oil is cooled to room temperature after keeping the temperature 1.6h.
(2) two-phase section quenches: being heated to 765 DEG C, the rate of heat addition is that oil is cooled to room temperature after 12 DEG C/min keeps the temperature 1.2h.
(3) it is tempered: steel billet in (2) being again heated to 190 DEG C, is air-cooled to room temperature after keeping the temperature 3h.
After above-mentioned heat treatment, the tissue of steel plate is ferrite+martensite, the performance test results in scope of design,
Bulletproof performance reaches C grades of " cabinet or armour plate " in People's Republic of China (PRC) industry standards of public safety GA 164-2005.
Embodiment 4
(1) quench: by heating steel billet to 900 DEG C, the rate of heat addition is 12 DEG C/min, keeps the temperature after 1.5h water cooling to room temperature.
(2) two-phase section quenches: being heated to 770 DEG C, the rate of heat addition is that oil is cooled to room temperature after 12 DEG C/min keeps the temperature 1h.
(3) it is tempered: steel billet in (2) being again heated to 200 DEG C, is air-cooled to room temperature after keeping the temperature 3h.
After above-mentioned heat treatment, the tissue of steel plate is ferrite+martensite, the performance test results in scope of design,
Bulletproof performance reaches C grades of " cabinet or armour plate " in People's Republic of China (PRC) industry standards of public safety GA 164-2005.
Embodiment 5
(1) quench: by heating steel billet to 910 DEG C, the rate of heat addition is 13 DEG C/min, and oil is cooled to room temperature after keeping the temperature 2h.
(2) two-phase section quenches: being heated to 775 DEG C, the rate of heat addition is that oil is cooled to room temperature after 11 DEG C/min keeps the temperature 1.6h.
(3) it is tempered: steel billet in (2) being again heated to 220 DEG C, is air-cooled to room temperature after keeping the temperature 3h.
After above-mentioned heat treatment, the tissue of steel plate is ferrite+martensite, the performance test results in scope of design,
Bulletproof performance reaches C grades of " cabinet or armour plate " in People's Republic of China (PRC) industry standards of public safety GA 164-2005.
Mechanical property is as shown in table 1 after the heat treatment of Examples 1 to 5 light plate.
Table 1
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention
Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.
Claims (2)
1. a kind of heat treatment method of civilian bullet proof steel, which is characterized in that chemical element component that the bullet proof steel contains and its
Mass percent are as follows: C 0.26~0.36%；Si 0.2~0.4%；Mn 0.75~1.1%；Cr 0.75~1.1%；Ni
1.8~2.2%；Mo 0.25~0.45%；V 0.15~0.25%；Nb0.015~0.025%；P≤0.015%；S≤
0.01%；Re 0~0.01%；Remaining is the inevitable impurity of Fe element；
The heat treatment method are as follows: ingredient is carried out by weight percent according to the chemical element component of above-mentioned bullet proof steel, using true
Empty smelting furnace carries out the smelting of molten steel, and steel billet is made, and heating steel billet to 1250 DEG C~1300 DEG C 6~8h of heat preservation is carried out hammering,
Hammering is at setting thickness；By good 1280 DEG C~1330 DEG C of steel billet of hammering, 1h~2h is kept the temperature, is rolled after coming out of the stove, sky after rolling
Be cooled to room temperature, then carry out quenching+two-phase section quenching+tempering heat treatment process, heat treatment the following steps are included:
(1) quench: by heating steel billet to 870~920 DEG C, the rate of heat addition is 10~15 DEG C/min, and oil is cold after keeping the temperature 1.5~2.5h
To room temperature；
(2) two-phase section quenches: being heated to 730~780 DEG C, the rate of heat addition is that oil is cooled to room after 10~15 DEG C/min keeps the temperature 1~2h
Temperature；
(3) it is tempered: steel billet in (2) being again heated to 170~240 DEG C, is air-cooled to room temperature after keeping the temperature 3~4h.
2. a kind of heat treatment method of civilian bullet proof steel described in accordance with the claim 1, which is characterized in that the bullet proof steel contains
Chemical element component and its mass percent are as follows: C 0.35%；Si 0.3%；Mn 0.9%；Cr 1%；Ni 2%；Mo
0.3%；V 0.18%；Nb 0.02%；P≤0.01%；S≤0.01%；RE 0.006%；Remaining is inevitable for Fe element
Impurity.
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Application publication date: 20190607 |