CN104561781A - Q460 level shock resisting steel and method for producing Q460 level shock resisting steel by using steekle mill - Google Patents
Q460 level shock resisting steel and method for producing Q460 level shock resisting steel by using steekle mill Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 171
- 239000010959 steel Substances 0.000 title claims abstract description 168
- 230000035939 shock Effects 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 title abstract description 12
- 238000005096 rolling process Methods 0.000 claims abstract description 73
- 238000001816 cooling Methods 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000012535 impurity Substances 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims description 15
- 239000000498 cooling water Substances 0.000 claims description 14
- 239000007921 spray Substances 0.000 claims description 14
- 238000002791 soaking Methods 0.000 claims description 7
- 229910052758 niobium Inorganic materials 0.000 abstract description 8
- 229910052720 vanadium Inorganic materials 0.000 abstract description 8
- 239000007769 metal material Substances 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 229910052748 manganese Inorganic materials 0.000 abstract 1
- 238000000465 moulding Methods 0.000 abstract 1
- 229910052710 silicon Inorganic materials 0.000 abstract 1
- 238000005507 spraying Methods 0.000 abstract 1
- 229910052719 titanium Inorganic materials 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 28
- 229910001566 austenite Inorganic materials 0.000 description 11
- 238000001556 precipitation Methods 0.000 description 10
- 229910052742 iron Inorganic materials 0.000 description 8
- 239000013078 crystal Substances 0.000 description 7
- 229910001563 bainite Inorganic materials 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 229910001562 pearlite Inorganic materials 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 5
- 230000009466 transformation Effects 0.000 description 5
- 229910000746 Structural steel Inorganic materials 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000598 ASTM A992 Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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Abstract
The invention relates to Q460 level shock resisting steel and a method for producing Q460 level shock resisting steel by using a steekle mill and belongs to the technical field of metal material processing and moulding. The Q460 level shock resisting steel comprises the following components: C, Si, Mn, S, P, Nb, V, Ti, N, Als and the balance of Fe and other impurities. The method comprises the following steps: firstly, after heating a slab and spraying water to dephosphorize, continuously realizing rough rolling and finish rolling on a same double-rack compact steekle mill; feeding the steel plate after finish rolling to a reeling machine to be reeled by rows; and then naturally air-cooling to room temperature to obtain the Q460 level shock resisting steel with high strength and low yield ratio. By adding microalloy elements such as Nb, V and the like, the strength and toughness of the Q460 level shock resisting steel are effectively improved. According to the method for producing the Q460 level shock resisting steel, the potential of a kunming steel double-rack compact steekle mill is fully explored, the variety of strip plates is expanded and the product structure is optimized.
Description
Technical field
The present invention relates to a kind of Q460 level shock resisting steel and the method with steekle mill production Q460 level shock resisting steel, belong to metal material processing and field shaping technique.
Background technology
Antidetonation steel plate has the features such as tensile strength is high, yield tensile ratio is low, Z-direction function admirable, welding performance are good as construction(al)steel.Along with the generation of Development of High-rise Buildings and geological disaster in recent years, the world and China have all paid attention to the development of anti-seismic structure steel.The shock resisting steel that the U.S. mainly uses is ASTM A992 structural steel and ASTM A572 structural steel (addition of yield tensile ratio to require).In recent years, Japan has developed a series of low yielding ratio type anti-seismic structure steel, as HT490 steel, HT590 steel and HT780 steel etc., all there is narrow yield strength fluctuation range, and in JIS G3136-1994 structural steel application specific standard, restriction is made to the yield tensile ratio of SN400 steel and SN490 steel.Anshan Iron and Steel Company of China, wuhan iron & steel croup co. company (Wuhan Steel stock Co., Ltd), Baoshan Iron and Steel Group Co, Wuyang Iron And Steel Co., Ltd etc. all can produce the excellent antidetonation steel plate meeting the corresponding trade mark of foreign standard, as SN490B steel, SN490B steel and A572 steel.Yunnan is located in earthquake-prone region, almost all there is ruinous earthquake every year, cause massive losses to people's lives and properties, therefore, Kunming University of Science and Technology's associating wuhan iron & steel croup co. company (Kunming Iron & Steel Co., Ltd) joint development high-grade antidetonation steel plate is just imperative.China develops Q460 level antidetonation steel plate at present and mainly adopts Heavy Plate Production technique, all adopt hot continuous rolling technology, do not report for employing separate unit steckel mill production antidetonation steel plate, utilize wuhan iron & steel croup co. company (Kunming Iron & Steel Co., Ltd) steckel mill for this reason, complete continuously roughing, in roll and finish rolling, thus develop high strength, low yield strength ratio Q460 level antidetonation steel plate, then beyond example can be reflected.
Summary of the invention
For above-mentioned prior art Problems existing and deficiency, the invention provides a kind of Q460 level shock resisting steel and the method with steekle mill production Q460 level shock resisting steel.This Q460 level shock resisting steel adds Nb, the micro alloying elements such as V, effectively improves intensity and the toughness of Q460 level antidetonation steel plate; This method produces Q460 level antidetonation steel plate, and fully excavated the potentiality of elder brother's steel steckel mill, expanded strip product variety, optimized product structure, the present invention is achieved through the following technical solutions.
A kind of Q460 level shock resisting steel, the percent composition of this Q460 level shock resisting steel is: C0.05 ~ 0.16wt%, Si0.25 ~ 0.40wt%, Mn1.20 ~ 1.70wt%, S≤0.030wt%, P≤0.030wt%, Nb0.035 ~ 0.090wt%, V0.05 ~ 0.15wt%, Ti0.05 ~ 0.10wt%, N≤0.015wt%, Als0.015 ~ 0.05wt%, and all the other are Fe and other impurity.
The method of Q460 level shock resisting steel produced by a kind of steekle mill, first by slab through heating, after water spray dephosphorization, same steckel mill completes roughing and finish rolling continuously, coiling machine is sent by finish rolling gained steel plate to batch through row, natural air cooling is to room temperature again, namely high strength is obtained, the Q460 level antidetonation steel plate of low yield strength ratio, wherein the percent composition of slab is: C0.05 ~ 0.16wt%, Si0.25 ~ 0.40wt%, Mn1.20 ~ 1.70wt%, S≤0.030wt%, P≤0.030wt%, Nb0.035 ~ 0.090wt%, V0.05 ~ 0.15wt%, Ti0.05 ~ 0.10wt%, N≤0.015wt%, Als0.015 ~ 0.05wt%, all the other are Fe and other impurity.
Its concrete steps are as follows:
Step 1, first slab is heated 130 ~ 260min under temperature is 1230 ~ 1270 DEG C of conditions, slab at the time controling of soaking zone at 45 ~ 65min;
Step 2, step 1 is processed after slab adopt pressure to be water under high pressure positive and negative water spray squama 11 ~ 16 second of 18 ~ 22MPa;
Step 3, send steckel mill to be rolled the slab of step 2 after de-scaling, and to control start rolling temperature be 1080 ~ 1170 DEG C, carry out the continuous roughing of 4 ~ 7 passages, open cooling water between passage simultaneously, obtain roughing steel plate;
Step 4, the roughing steel plate that obtains through step 3 to be continued steckel mill time delay 25 ~ 50 seconds, then roughing steel billet temperature is made to be 860 ~ 890 DEG C, carry out the continuous finish rolling of 4 passage, and open cooling water between passage, control finishing temperature is 810 ~ 860 DEG C and prepares finish rolling steel plate;
Step 5, finish rolling steel plate step 4 obtained send coiling machine to batch, and to control coiling temperature be 570 ~ 630 DEG C, control laminar flow cooling velocity 11 ~ 16 DEG C/s simultaneously and obtain roll of steel plate;
Step 6, step 5 is obtained roll of steel plate natural air cooling to room temperature, namely obtain high strength, low yield strength ratio Q460 level antidetonation steel plate.
In described step 4, roughing steel plate continues steckel mill time delay 25 ~ 50 seconds, allow roughing steel plate back and forth carry out finish rolling again after travelling 25 ~ 50 seconds in ground roll, and control finish rolling total deformation rate and be greater than 48%, the slab generation relaxation after continuous roughing large deformation is allowed to separate out, obtain the roughed bloom of evenly tiny austenite structure, effectively prevent the generation of mixed crystal.
Road number of times, mill speed in described step 3 and step 4 process, specifically determine depending on different size requirement.
In above-mentioned steps 1, slab utilizes the method for making steel of prior art to obtain, and Nb, V wherein and other chemical element add, control to obtain in steelmaking process.
The present invention prepares and produces thickness is that the Q460 level antidetonation steel plate of 10 ~ 40mm has high strength, high-ductility, high tenacity, yield tensile ratio <0.8, the advantages such as Z-direction function admirable, meet current China high level, Super High and the requirement of large-span steel building to steel anti-seismic performance.
The invention has the beneficial effects as follows:
1, adopt the present invention to produce Q460 level antidetonation steel plate, fully excavated the potentiality of elder brother's steel steckel mill, expanded strip product variety, optimized product structure.
2, add time delay rolling mill practice in the operation of rolling, make the Nb added in steel, the micro alloying elements such as V play one's part to the full, and obtain fine uniform tissue, thus prevent the appearance of mixed crystal, effectively improve intensity and the toughness of Q460 level antidetonation steel plate.
3, utilize composition of the present invention and production technology, by the strict control of link each in actual production process, the Q460 level antidetonation steel plate produced has the feature of high strength, low yield strength ratio, and combination property is good.Utilize the sheet material property indices of this Q460 level antidetonation steel plate welding production to meet national standard, the requirement of construction steel structure to anti-seismic performance can be met completely.
4, the Q460 level antidetonation steel plate of the method production is compared with other conventional products, has high technology content, high added value feature, remarkable in economical benefits.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is further described.
Embodiment 1
This Q460 level shock resisting steel, the percent composition of this Q460 level shock resisting steel is: C0.08wt%, Si0.25wt%, Mn1.65wt%, S0.015wt%, P0.020wt%, Nb0.055wt%, V0.09wt%, Ti0.07wt%, N0.010wt%, Als0.035wt%, all the other are Fe and other impurity, and impurity is inevitable impurity.
This produces the method for Q460 level shock resisting steel with steekle mill: first by slab through heating, after water spray dephosphorization, same steckel mill completes roughing and finish rolling continuously, coiling machine is sent by finish rolling gained steel plate to batch through row, natural air cooling is to room temperature again, namely high strength is obtained, the Q460 level antidetonation steel plate of low yield strength ratio, wherein slab percent composition is: C0.08wt%, Si0.25wt%, Mn1.65wt%, S0.015wt%, P0.020wt%, Nb0.055wt%, V0.09wt%, Ti0.07wt%, N0.010wt%, Als0.035wt%, all the other are Fe and other impurity, impurity is inevitable impurity.
Concrete steps are as follows:
Step 1, first slab is heated 180min under temperature is 1250 DEG C of conditions, wherein slab at the time controling of soaking zone at 57min, to ensure that the microalloies such as Nb, V of separating out in slab are fully heavy molten, fining austenite grains is also prepared, with even internal structure of slab for cooling control after rolling precipitation;
Step 2, step 1 is processed after slab adopt pressure to be water under high pressure positive and negative water spray squama 13 second of 19MPa;
Step 3, steckel mill is sent to be rolled the slab of step 2 after de-scaling, and to control start rolling temperature be 1120 DEG C, carry out the continuous roughing of 4 passages, open cooling water between passage simultaneously, roughing is carried out under the mill speed of 2.6m/s, obtains roughing steel plate;
Step 4, the roughing steel plate obtained through step 3 is continued steckel mill time delay 38 seconds, roughing steel plate is allowed back and forth to carry out finish rolling again after travelling 38 seconds in ground roll, and to control finish rolling total deformation rate be 56%, the slab generation relaxation after continuous roughing large deformation is allowed to separate out, obtain the roughed bloom of evenly tiny austenite structure, effectively prevent the generation of mixed crystal, then roughing steel billet temperature is made to be 860 DEG C, controlled rolling speed 4.5m/s, carry out the continuous finish rolling of 6 passage, and open cooling water between passage, control finishing temperature is 820 DEG C and prepares finish rolling steel plate,
Step 5, finish rolling steel plate step 4 obtained send coiling machine to batch, and to control coiling temperature be 590 DEG C, control laminar flow cooling velocity 15 DEG C/s simultaneously and obtain roll of steel plate; Section cooling speed is 15 DEG C/s, the precipitation strength in order to control microalloy and solution strengthening, reach the object controlling the structural transformation such as pearlite, bainite pattern, size, quantity and distribution, to ensure that product has enough intensity and toughness by controlling coiling temperature simultaneously.
Step 6, step 5 is obtained roll of steel plate natural air cooling to room temperature, namely obtains high strength, Q460 level antidetonation steel plate that low yield strength ratio, thickness are 20mm.
The mechanical property of the Q460 level antidetonation steel plate that the present embodiment prepares is as shown in table 1.
The mechanical property table of table 1 Q460 level antidetonation steel plate
Embodiment 2
This Q460 level shock resisting steel, the percent composition of this Q460 level shock resisting steel is: C0.10wt%, Si0.34wt%, Mn1.55wt%, S0.018wt%, P0.023wt%, Nb0.045wt%, V0.08wt%, Ti0.09wt%, N0.008wt%, Als0.028wt%, and all the other are Fe and inevitable impurity.
This produces the method for Q460 level shock resisting steel with steekle mill: first by slab through heating, after water spray dephosphorization, same steckel mill completes roughing and finish rolling continuously, coiling machine is sent by finish rolling gained steel plate to batch through row, natural air cooling is to room temperature again, namely high strength is obtained, the Q460 level antidetonation steel plate of low yield strength ratio, wherein the percent composition of slab is: C0.10wt%, Si0.34wt%, Mn1.55wt%, S0.018wt%, P0.023wt%, Nb0.045wt%, V0.08wt%, Ti0.09wt%, N0.008wt%, Als0.028wt%, all the other are Fe and inevitable impurity.
Concrete steps are as follows:
Step 1, first slab is heated 190min under temperature is 1260 DEG C of conditions, wherein slab at the time controling of soaking zone at 59min, to ensure that the microalloies such as Nb, V of separating out in slab are fully heavy molten, fining austenite grains is also prepared, with even internal structure of slab for cooling control after rolling precipitation;
Step 2, step 1 is processed after slab adopt pressure to be water under high pressure positive and negative water spray squama 14 second of 19MPa;
Step 3, steckel mill is sent to be rolled the slab of step 2 after de-scaling, and to control start rolling temperature be 1140 DEG C, carry out the continuous roughing of 4 passages, open cooling water between passage simultaneously, roughing is carried out under the mill speed of 2.3m/s, obtains roughing steel plate;
Step 4, the roughing steel plate obtained through step 3 is continued steckel mill time delay 40 seconds, roughing steel plate is allowed back and forth to carry out finish rolling again after travelling 40 seconds in ground roll, and to control finish rolling total deformation rate be 60%, the slab generation relaxation after continuous roughing large deformation is allowed to separate out, obtain the roughed bloom of evenly tiny austenite structure, effectively prevent the generation of mixed crystal, then roughing steel billet temperature is made to be 870 DEG C, controlled rolling speed 4.2m/s, carry out the continuous finish rolling of 5 passage, and open cooling water between passage, control finishing temperature is 850 DEG C and prepares finish rolling steel plate,
Step 5, finish rolling steel plate step 4 obtained send coiling machine to batch, and to control coiling temperature be 620 DEG C, control laminar flow cooling velocity 15 DEG C/s simultaneously and obtain roll of steel plate; Section cooling speed is 15 DEG C/s, the precipitation strength in order to control microalloy and solution strengthening, reach the object controlling the structural transformation such as pearlite, bainite pattern, size, quantity and distribution, to ensure that product has enough intensity and toughness by controlling coiling temperature simultaneously.
Step 6, step 5 is obtained roll of steel plate natural air cooling to room temperature, namely obtains high strength, Q460 level antidetonation steel plate that low yield strength ratio, thickness are 32mm.
The mechanical property of the Q460 level antidetonation steel plate that the present embodiment prepares is as shown in table 2.
The mechanical property table of table 2 Q460 level antidetonation steel plate
Embodiment 3
This Q460 level shock resisting steel, the percent composition of this Q460 level shock resisting steel is: C0.14wt%, Si0.35wt%, Mn1.53wt%, S0.020wt%, P0.025wt%, Nb0.040wt%, V0.12wt%, Ti0.08wt%, N0.009wt%, Als0.026wt%, and all the other are Fe and inevitable impurity.
This produces the method for Q460 level shock resisting steel with steekle mill: first by slab through heating, after water spray dephosphorization, same steckel mill completes roughing and finish rolling continuously, coiling machine is sent by finish rolling gained steel plate to batch through row, natural air cooling is to room temperature again, namely high strength is obtained, the Q460 level antidetonation steel plate of low yield strength ratio, wherein the percent composition of slab is: C0.14wt%, Si0.35wt%, Mn1.53wt%, S0.020wt%, P0.025wt%, Nb0.040wt%, V0.12wt%, Ti0.08wt%, N0.009wt%, Als0.026wt%, all the other are Fe and inevitable impurity.
Concrete steps are as follows:
Step 1, first slab is heated 220min under temperature is 1270 DEG C of conditions, wherein slab at the time controling of soaking zone at 60min, to ensure that the microalloies such as Nb, V of separating out in slab are fully heavy molten, fining austenite grains is also prepared, with even internal structure of slab for cooling control after rolling precipitation;
Step 2, step 1 is processed after slab adopt pressure to be water under high pressure positive and negative water spray squama 15 second of 21MPa;
Step 3, steckel mill is sent to be rolled the slab of step 2 after de-scaling, and to control start rolling temperature be 1170 DEG C, carry out the continuous roughing of 6 passages, open cooling water between passage simultaneously, roughing is carried out under the mill speed of 2.5m/s, obtains roughing steel plate;
Step 4, the roughing steel plate obtained through step 3 is continued steckel mill time delay 50 seconds, roughing steel plate is allowed back and forth to carry out finish rolling again after travelling 50 seconds in ground roll, and to control finish rolling total deformation rate be 65%, the slab generation relaxation after continuous roughing large deformation is allowed to separate out, obtain the roughed bloom of evenly tiny austenite structure, effectively prevent the generation of mixed crystal, then roughing steel billet temperature is made to be 890 DEG C, controlled rolling speed 4.5m/s, carry out the continuous finish rolling of 8 passage, and open cooling water between passage, control finishing temperature is 860 DEG C and prepares finish rolling steel plate,
Step 5, finish rolling steel plate step 4 obtained send coiling machine to batch, and to control coiling temperature be 610 DEG C, control laminar flow cooling velocity 16 DEG C/s simultaneously and obtain roll of steel plate; Section cooling speed is 16 DEG C/s, the precipitation strength in order to control microalloy and solution strengthening, reach the object controlling the structural transformation such as pearlite, bainite pattern, size, quantity and distribution, to ensure that product has enough intensity and toughness by controlling coiling temperature simultaneously.
Step 6, step 5 is obtained roll of steel plate natural air cooling to room temperature, namely obtains high strength, Q460 level antidetonation steel plate that low yield strength ratio, thickness are 38mm.
The mechanical property of the Q460 level antidetonation steel plate that the present embodiment prepares is as shown in table 3.
The mechanical property table of table 3 Q460 level antidetonation steel plate
Embodiment 4
This Q460 level shock resisting steel, the percent composition of this Q460 level shock resisting steel is: C0.05wt%, Si0.25wt%, Mn1.70wt%, S0.032wt%, P0.025wt%, Nb0.035wt%, V0.15wt%, Ti0.05wt%, N0.005wt%, Als0.015wt%, and all the other are Fe and inevitable impurity.
This produces the method for Q460 level shock resisting steel with steekle mill: first by slab through heating, after water spray dephosphorization, same steckel mill completes roughing and finish rolling continuously, coiling machine is sent by finish rolling gained steel plate to batch through row, natural air cooling is to room temperature again, namely high strength is obtained, the Q460 level antidetonation steel plate of low yield strength ratio, wherein the percent composition of slab is: C0.05wt%, Si0.25wt%, Mn1.70wt%, S0.032wt%, P0.025wt%, Nb0.035wt%, V0.15wt%, Ti0.05wt%, N0.005wt%, Als0.015wt%, all the other are Fe and inevitable impurity.
Concrete steps are as follows:
Step 1, first slab is heated 260min under temperature is 1230 DEG C of conditions, wherein slab at the time controling of soaking zone at 45min, to ensure that the microalloies such as Nb, V of separating out in slab are fully heavy molten, fining austenite grains is also prepared, with even internal structure of slab for cooling control after rolling precipitation;
Step 2, step 1 is processed after slab adopt pressure to be water under high pressure positive and negative water spray squama 11 second of 18MPa;
Step 3, steckel mill is sent to be rolled the slab of step 2 after de-scaling, and to control start rolling temperature be 1080 DEG C, carry out the continuous roughing of 7 passages, open cooling water between passage simultaneously, roughing is carried out under the mill speed of 2.4m/s, obtains roughing steel plate;
Step 4, the roughing steel plate obtained through step 3 is continued steckel mill time delay 25 seconds, roughing steel plate is allowed back and forth to carry out finish rolling again after travelling 25 seconds in ground roll, and to control finish rolling total deformation rate be 55%, the slab generation relaxation after continuous roughing large deformation is allowed to separate out, obtain the roughed bloom of evenly tiny austenite structure, effectively prevent the generation of mixed crystal, then roughing steel billet temperature is made to be 870 DEG C, controlled rolling speed 4.4m/s, carry out the continuous finish rolling of 4 passage, and open cooling water between passage, control finishing temperature is 810 DEG C and prepares finish rolling steel plate,
Step 5, finish rolling steel plate step 4 obtained send coiling machine to batch, and to control coiling temperature be 570 DEG C, control laminar flow cooling velocity 11 DEG C/s simultaneously and obtain roll of steel plate; Section cooling speed is 11 DEG C/s, the precipitation strength in order to control microalloy and solution strengthening, reach the object controlling the structural transformation such as pearlite, bainite pattern, size, quantity and distribution, to ensure that product has enough intensity and toughness by controlling coiling temperature simultaneously.
Step 6, step 5 is obtained roll of steel plate natural air cooling to room temperature, namely obtains high strength, Q460 level antidetonation steel plate that low yield strength ratio, thickness are 40mm.
The mechanical property of the Q460 level antidetonation steel plate that the present embodiment prepares is as shown in table 4.
The mechanical property table of table 4 Q460 level antidetonation steel plate
Embodiment 5
This Q460 level shock resisting steel, the percent composition of this Q460 level shock resisting steel is: C0.16wt%, Si0.40wt%, Mn1.20wt%, S0.030wt%, P0.025wt%, Nb0.090wt%, V0.05wt%, Ti0.10wt%, N0.010wt%, Als0.05wt%, and all the other are Fe and inevitable impurity.
This produces the method for Q460 level shock resisting steel with steekle mill: first by slab through heating, after water spray dephosphorization, same steckel mill completes roughing and finish rolling continuously, coiling machine is sent by finish rolling gained steel plate to batch through row, natural air cooling is to room temperature again, namely high strength is obtained, the Q460 level antidetonation steel plate of low yield strength ratio, wherein the percent composition of slab is C0.11wt%, Si0.40wt%, Mn1.20wt%, S0.030wt%, P0.025wt%, Nb0.090wt%, V0.05wt%, Ti0.10wt%, N0.010wt%, Als0.05wt%, all the other are Fe and inevitable impurity.
Concrete steps are as follows:
Step 1, first slab is heated 180min under temperature is 1250 DEG C of conditions, wherein slab at the time controling of soaking zone at 65min, to ensure that the microalloies such as Nb, V of separating out in slab are fully heavy molten, fining austenite grains is also prepared, with even internal structure of slab for cooling control after rolling precipitation;
Step 2, step 1 is processed after slab adopt pressure to be water under high pressure positive and negative water spray squama 16 second of 22MPa;
Step 3, steckel mill is sent to be rolled the slab of step 2 after de-scaling, and to control start rolling temperature be 1150 DEG C, carry out the continuous roughing of 6 passages, open cooling water between passage simultaneously, roughing is carried out under the mill speed of 2.1m/s, obtains roughing steel plate;
Step 4, the roughing steel plate obtained through step 3 is continued steckel mill time delay 35 seconds, roughing steel plate is allowed back and forth to carry out finish rolling again after travelling 35 seconds in ground roll, and to control finish rolling total deformation rate be 50%, the slab generation relaxation after continuous roughing large deformation is allowed to separate out, obtain the roughed bloom of evenly tiny austenite structure, effectively prevent the generation of mixed crystal, then roughing steel billet temperature is made to be 880 DEG C, controlled rolling speed 4.2m/s, carry out the continuous finish rolling of 8 passage, and open cooling water between passage, control finishing temperature is 850 DEG C and prepares finish rolling steel plate,
Step 5, finish rolling steel plate step 4 obtained send coiling machine to batch, and to control coiling temperature be 630 DEG C, control laminar flow cooling velocity 16 DEG C/s simultaneously and obtain roll of steel plate; Section cooling speed is 16 DEG C/s, the precipitation strength in order to control microalloy and solution strengthening, reach the object controlling the structural transformation such as pearlite, bainite pattern, size, quantity and distribution, to ensure that product has enough intensity and toughness by controlling coiling temperature simultaneously.
Step 6, step 5 is obtained roll of steel plate natural air cooling to room temperature, namely obtains high strength, Q460 level antidetonation steel plate that low yield strength ratio, thickness are 16mm.
The mechanical property of the Q460 level antidetonation steel plate that the present embodiment prepares is as shown in table 5.
The mechanical property table of table 5 Q460 level antidetonation steel plate
Above the specific embodiment of the present invention is explained in detail, but the present invention is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, various change can also be made under the prerequisite not departing from present inventive concept.
Claims (5)
1. a Q460 level shock resisting steel, it is characterized in that: the percent composition of this Q460 level shock resisting steel is: C0.05 ~ 0.16wt%, Si0.25 ~ 0.40wt%, Mn1.20 ~ 1.70wt%, S≤0.030wt%, P≤0.030wt%, Nb0.035 ~ 0.090wt%, V0.05 ~ 0.15wt%, Ti0.05 ~ 0.10wt%, N≤0.015wt%, Als0.015 ~ 0.05wt%, all the other are Fe and other impurity.
2. produce the method for Q460 level shock resisting steel according to claim 1 with steekle mill for one kind, it is characterized in that: first by slab through heating, after water spray dephosphorization, same steckel mill completes roughing and finish rolling continuously, coiling machine is sent by finish rolling gained steel plate to batch through row, natural air cooling is to room temperature again, namely high strength is obtained, the Q460 level antidetonation steel plate of low yield strength ratio, wherein the percent composition of slab is: C0.05 ~ 0.16wt%, Si0.25 ~ 0.40wt%, Mn1.20 ~ 1.70wt%, S≤0.030wt%, P≤0.030wt%, Nb0.035 ~ 0.090wt%, V0.05 ~ 0.15wt%, Ti0.05 ~ 0.10wt%, N≤0.015wt%, Als0.015 ~ 0.05wt%, all the other are Fe and other impurity.
3. the method for Q460 level shock resisting steel produced by steekle mill according to claim 2, it is characterized in that concrete steps are as follows:
Step 1, first slab is heated 130 ~ 260min under temperature is 1230 ~ 1270 DEG C of conditions, slab at the time controling of soaking zone at 45 ~ 65min;
Step 2, step 1 is processed after slab adopt pressure to be water under high pressure positive and negative water spray squama 11 ~ 16 second of 18 ~ 22MPa;
Step 3, send steckel mill to be rolled the slab of step 2 after de-scaling, and to control start rolling temperature be 1080 ~ 1170 DEG C, carry out the continuous roughing of 4 ~ 7 passages, open cooling water between passage simultaneously, obtain roughing steel plate;
Step 4, the roughing steel plate that obtains through step 3 to be continued steckel mill time delay 25 ~ 50 seconds, then roughing steel billet temperature is made to be 860 ~ 890 DEG C, carry out the continuous finish rolling of 4 passage, and open cooling water between passage, control finishing temperature is 810 ~ 860 DEG C and prepares finish rolling steel plate;
Step 5, finish rolling steel plate step 4 obtained send coiling machine to batch, and to control coiling temperature be 570 ~ 630 DEG C, control laminar flow cooling velocity 11 ~ 16 DEG C/s simultaneously and obtain roll of steel plate;
Step 6, step 5 is obtained roll of steel plate natural air cooling to room temperature, namely obtain high strength, low yield strength ratio Q460 level antidetonation steel plate.
4. the method for Q460 level shock resisting steel produced by steekle mill according to claim 3, it is characterized in that: in described step 4, roughing steel plate continues steckel mill time delay 25 ~ 50 seconds, allow roughing steel plate back and forth move about 25 ~ 50 seconds in ground roll, carry out finish rolling more afterwards, and control finish rolling total deformation rate and be greater than 48%.
5. the method for Q460 level shock resisting steel produced by steekle mill according to claim 3, it is characterized in that: road number of times, mill speed in described step 3 and step 4 process, specifically determines depending on different size requirement.
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| CN109706403A (en) * | 2019-02-28 | 2019-05-03 | 辽宁科技学院 | A kind of Q460E steel plate and its rolling mill practice |
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