CN104561781B - A kind of Q460 level shock resisting steel and the method producing Q460 level shock resisting steel with steekle mill - Google Patents
A kind of Q460 level shock resisting steel and the method producing Q460 level shock resisting steel with steekle mill Download PDFInfo
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Abstract
The present invention relates to a kind of Q460 level shock resisting steel and the method producing Q460 level shock resisting steel with steekle mill, belong to metal material processing and field shaping technique.This Q460 level shock resisting steel component is: C, Si, Mn, S, P, Nb, V, Ti, N, Als, remaining is Fe and other impurity.First slab is heated, water spray dephosphorization after, same steckel mill is continuously finished roughing and finish rolling, finish rolling gained steel plate send coiling machine batch through row, then natural air cooling is to room temperature, i.e. obtains the Q460 level antidetonation steel plate of high intensity, low yield strength ratio.This Q460 level shock resisting steel adds the micro alloying elements such as Nb, V, is effectively increased intensity and the toughness of Q460 level antidetonation steel plate；This method produces Q460 level antidetonation steel plate, has fully excavated the potentiality of elder brother's steel steckel mill, has expanded strip product variety, optimized product structure.
Description
Technical field
The present invention relates to a kind of Q460 level shock resisting steel and the method producing Q460 level shock resisting steel with steekle mill, 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 Development of High-rise Buildings and the generation of geological disaster, the world and China had all paid attention to the development of anti-seismic structure steel in recent years.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, such as HT490 steel, HT590 steel and HT780 steel etc., is respectively provided with narrow yield strength fluctuation range, and at JIS
In G3136-1994 structural steel application specific standard, the yield tensile ratio to SN400 steel and SN490 steel makes restriction.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, such as SN490B steel, SN490B steel and A572 steel.Yunnan is located in earthquake-prone region, almost all there is ruinous earthquake every year, people's lives and properties are caused massive losses, therefore, Kunming University of Science and Technology associating wuhan iron & steel croup co. company (Kunming Iron & Steel Co., Ltd) joint development high-grade antidetonation steel plate the most imperative.China develops Q460 level antidetonation steel plate at present and mainly uses Heavy Plate Production technique, all use hot continuous rolling technology, do not report for using separate unit steckel mill to produce antidetonation steel plate, wuhan iron & steel croup co. company (Kunming Iron & Steel Co., Ltd) steckel mill is utilized for this, be continuously finished roughing, in roll and finish rolling, thus develop high intensity, low yield strength ratio Q460 level antidetonation steel plate, then beyond example can be reflected.
Summary of the invention
The problem existed for above-mentioned prior art and deficiency, the present invention provides a kind of Q460 level shock resisting steel and the method producing Q460 level shock resisting steel with steekle mill.This Q460 level shock resisting steel adds the micro alloying elements such as Nb, V, is effectively increased intensity and the toughness of Q460 level antidetonation steel plate；This method produces Q460 level antidetonation steel plate, has fully excavated the potentiality of elder brother's steel steckel mill, has expanded strip product variety, has optimized product structure, and 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 remaining is Fe and other impurity.
nullA kind of steekle mill produces the method for Q460 level shock resisting steel，First slab is heated、After water spray dephosphorization，Same steckel mill is continuously finished roughing and finish rolling，Finish rolling gained steel plate send coiling machine batch through row，Natural air cooling is to room temperature again，I.e. obtain high intensity、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%，Remaining is Fe and other impurity.
It specifically comprises the following steps that
Step 1, first slab heating under the conditions of temperature is 1230 ~ 1270 DEG C 130 ~ 260min, slab controlled at 45 ~ 65min in the time of soaking zone；
Step 2, step 1 is processed after the slab water under high pressure positive and negative water spray squama 11 ~ 16 seconds that uses pressure to be 18 ~ 22MPa；
Step 3, send steckel mill to roll the step 2 slab after de-scaling, and to control start rolling temperature be 1080 ~ 1170 DEG C, carry out the continuous roughing of 4 ~ 7 passages, open simultaneously and cool down water between passage, obtain roughing steel plate；
Step 4, the roughing steel plate that obtains through step 3 is continued steckel mill time delay 25 ~ 50 seconds, then making roughing steel billet temperature is 860 ~ 890 DEG C, carrying out the 4 continuous finish rolling of 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 11 ~ 16 DEG C/s of laminar flow rate of cooling simultaneously and obtain roll of steel plate；
Step 6, step 5 is obtained roll of steel plate natural air cooling to room temperature, i.e. obtain high intensity, low yield strength ratio Q460 level antidetonation steel plate.
In described step 4, roughing steel plate continues steckel mill time delay 25 ~ 50 seconds, it is to allow roughing steel plate carry out finish rolling again after reciprocal travelling 25 ~ 50 seconds in ground roll, and control finish rolling total deformation rate more than 48%, the slab generation relaxation after continuous roughing large deformation is allowed to separate out, obtain the roughed bloom of the most tiny austenite structure, effectively prevent the generation of mixed crystal.
Road number of times during described step 3 and step 4, mill speed, require depending on different size and specifically determine.
In above-mentioned steps 1, slab is that the method for making steel utilizing prior art obtains, and Nb, V therein and other chemical element add in steelmaking process, control to obtain.
The present invention prepares the Q460 level antidetonation steel plate that production thickness is 10 ~ 40mm and has high intensity, 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 to steel anti-seismic performance of the large-span steel building.
The invention has the beneficial effects as follows:
1, use 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, the operation of rolling adds time delay rolling mill practice so that add the micro alloying elements such as Nb, V in steel and play one's part to the full, it is thus achieved that fine uniform tissue, thus prevent the appearance of mixed crystal, be effectively increased intensity and the toughness of Q460 level antidetonation steel plate.
3, utilizing composition and the production technology of the present invention, by the strict control of link each in actual production process, the Q460 level antidetonation steel plate produced has the feature of high intensity, low yield strength ratio, and combination property is good.The sheet material property indices utilizing this Q460 level antidetonation steel plate welding production meets national standard, is entirely capable of the requirement meeting construction steel structure to anti-seismic performance.
4, the Q460 level antidetonation steel plate that the method produces 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%, remaining is Fe and other impurity, and impurity is inevitable impurity.
This method producing Q460 level shock resisting steel with steekle mill: first that slab is heated, after water spray dephosphorization, same steckel mill is continuously finished roughing and finish rolling, finish rolling gained steel plate send coiling machine batch through row, natural air cooling is to room temperature again, i.e. obtain high intensity, 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%, remaining is Fe and other impurity, impurity is inevitable impurity.
Specifically comprise the following steps that
Step 1, first slab is heated under the conditions of temperature is 1250 DEG C 180min, wherein slab controls at 57min in the time of soaking zone, to ensure that the microalloies such as Nb, V of separating out in slab fully weigh molten, fining austenite grains is also prepared for cooling control after rolling precipitation, with uniform internal structure of slab；
Step 2, step 1 is processed after the slab water under high pressure positive and negative water spray squama 13 seconds that uses pressure to be 19MPa；
Step 3, steckel mill is sent to roll the step 2 slab after de-scaling, and to control start rolling temperature be 1120 DEG C, carry out the continuous roughing of 4 passages, open simultaneously and between passage, cool down water, 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 to carry out finish rolling again after reciprocal 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 the most tiny austenite structure, effectively prevent the generation of mixed crystal, then making roughing steel billet temperature is 860 DEG C, controlled rolling speed 4.5m/s, carry out the 6 continuous finish rolling of 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 15 DEG C/s of laminar flow rate of cooling simultaneously and obtain roll of steel plate；Section cooling speed is 15 DEG C/s, it is to control the precipitation strength of microalloy and solution strengthening, reach to control the structural transformation pattern such as pearlite, bainite, size, quantity and the purpose of distribution, to ensure that product has enough intensity and toughness by control coiling temperature simultaneously.
Step 6, step 5 is obtained roll of steel plate natural air cooling to room temperature, i.e. obtain high intensity, low yield strength ratio, thickness are the Q460 level antidetonation steel plate of 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 remaining is Fe and inevitable impurity.
This method producing Q460 level shock resisting steel with steekle mill: first that slab is heated, after water spray dephosphorization, same steckel mill is continuously finished roughing and finish rolling, finish rolling gained steel plate send coiling machine batch through row, natural air cooling is to room temperature again, i.e. obtain high intensity, 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%, remaining is Fe and inevitable impurity.
Specifically comprise the following steps that
Step 1, first slab is heated under the conditions of temperature is 1260 DEG C 190min, wherein slab controls at 59min in the time of soaking zone, to ensure that the microalloies such as Nb, V of separating out in slab fully weigh molten, fining austenite grains is also prepared for cooling control after rolling precipitation, with uniform internal structure of slab；
Step 2, step 1 is processed after the slab water under high pressure positive and negative water spray squama 14 seconds that uses pressure to be 19MPa；
Step 3, steckel mill is sent to roll the step 2 slab after de-scaling, and to control start rolling temperature be 1140 DEG C, carry out the continuous roughing of 4 passages, open simultaneously and between passage, cool down water, 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 to carry out finish rolling again after reciprocal 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 the most tiny austenite structure, effectively prevent the generation of mixed crystal, then making roughing steel billet temperature is 870 DEG C, controlled rolling speed 4.2m/s, carry out the 5 continuous finish rolling of 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 15 DEG C/s of laminar flow rate of cooling simultaneously and obtain roll of steel plate；Section cooling speed is 15 DEG C/s, it is to control the precipitation strength of microalloy and solution strengthening, reach to control the structural transformation pattern such as pearlite, bainite, size, quantity and the purpose of distribution, to ensure that product has enough intensity and toughness by control coiling temperature simultaneously.
Step 6, step 5 is obtained roll of steel plate natural air cooling to room temperature, i.e. obtain high intensity, low yield strength ratio, thickness are the Q460 level antidetonation steel plate of 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 remaining is Fe and inevitable impurity.
This method producing Q460 level shock resisting steel with steekle mill: first that slab is heated, after water spray dephosphorization, same steckel mill is continuously finished roughing and finish rolling, finish rolling gained steel plate send coiling machine batch through row, natural air cooling is to room temperature again, i.e. obtain high intensity, 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%, remaining is Fe and inevitable impurity.
Specifically comprise the following steps that
Step 1, first slab is heated under the conditions of temperature is 1270 DEG C 220min, wherein slab controls at 60min in the time of soaking zone, to ensure that the microalloies such as Nb, V of separating out in slab fully weigh molten, fining austenite grains is also prepared for cooling control after rolling precipitation, with uniform internal structure of slab；
Step 2, step 1 is processed after the slab water under high pressure positive and negative water spray squama 15 seconds that uses pressure to be 21MPa；
Step 3, steckel mill is sent to roll the step 2 slab after de-scaling, and to control start rolling temperature be 1170 DEG C, carry out the continuous roughing of 6 passages, open simultaneously and between passage, cool down water, 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 to carry out finish rolling again after reciprocal 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 the most tiny austenite structure, effectively prevent the generation of mixed crystal, then making roughing steel billet temperature is 890 DEG C, controlled rolling speed 4.5m/s, carry out the 8 continuous finish rolling of 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 16 DEG C/s of laminar flow rate of cooling simultaneously and obtain roll of steel plate；Section cooling speed is 16 DEG C/s, it is to control the precipitation strength of microalloy and solution strengthening, reach to control the structural transformation pattern such as pearlite, bainite, size, quantity and the purpose of distribution, to ensure that product has enough intensity and toughness by control coiling temperature simultaneously.
Step 6, step 5 is obtained roll of steel plate natural air cooling to room temperature, i.e. obtain high intensity, low yield strength ratio, thickness are the Q460 level antidetonation steel plate of 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 remaining is Fe and inevitable impurity.
This method producing Q460 level shock resisting steel with steekle mill: first that slab is heated, after water spray dephosphorization, same steckel mill is continuously finished roughing and finish rolling, finish rolling gained steel plate send coiling machine batch through row, natural air cooling is to room temperature again, i.e. obtain high intensity, 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%, remaining is Fe and inevitable impurity.
Specifically comprise the following steps that
Step 1, first slab is heated under the conditions of temperature is 1230 DEG C 260min, wherein slab controls at 45min in the time of soaking zone, to ensure that the microalloies such as Nb, V of separating out in slab fully weigh molten, fining austenite grains is also prepared for cooling control after rolling precipitation, with uniform internal structure of slab；
Step 2, step 1 is processed after the slab water under high pressure positive and negative water spray squama 11 seconds that uses pressure to be 18MPa；
Step 3, steckel mill is sent to roll the step 2 slab after de-scaling, and to control start rolling temperature be 1080 DEG C, carry out the continuous roughing of 7 passages, open simultaneously and between passage, cool down water, 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 to carry out finish rolling again after reciprocal 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 the most tiny austenite structure, effectively prevent the generation of mixed crystal, then making roughing steel billet temperature is 870 DEG C, controlled rolling speed 4.4m/s, carry out the 4 continuous finish rolling of 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 11 DEG C/s of laminar flow rate of cooling simultaneously and obtain roll of steel plate；Section cooling speed is 11 DEG C/s, it is to control the precipitation strength of microalloy and solution strengthening, reach to control the structural transformation pattern such as pearlite, bainite, size, quantity and the purpose of distribution, to ensure that product has enough intensity and toughness by control coiling temperature simultaneously.
Step 6, step 5 is obtained roll of steel plate natural air cooling to room temperature, i.e. obtain high intensity, low yield strength ratio, thickness are the Q460 level antidetonation steel plate of 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 remaining is Fe and inevitable impurity.
This method producing Q460 level shock resisting steel with steekle mill: first that slab is heated, after water spray dephosphorization, same steckel mill is continuously finished roughing and finish rolling, finish rolling gained steel plate send coiling machine batch through row, natural air cooling is to room temperature again, i.e. obtain high intensity, 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%, remaining is Fe and inevitable impurity.
Specifically comprise the following steps that
Step 1, first slab is heated under the conditions of temperature is 1250 DEG C 180min, wherein slab controls at 65min in the time of soaking zone, to ensure that the microalloies such as Nb, V of separating out in slab fully weigh molten, fining austenite grains is also prepared for cooling control after rolling precipitation, with uniform internal structure of slab；
Step 2, step 1 is processed after the slab water under high pressure positive and negative water spray squama 16 seconds that uses pressure to be 22MPa；
Step 3, steckel mill is sent to roll the step 2 slab after de-scaling, and to control start rolling temperature be 1150 DEG C, carry out the continuous roughing of 6 passages, open simultaneously and between passage, cool down water, 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 to carry out finish rolling again after reciprocal 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 the most tiny austenite structure, effectively prevent the generation of mixed crystal, then making roughing steel billet temperature is 880 DEG C, controlled rolling speed 4.2m/s, carry out the 8 continuous finish rolling of 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 16 DEG C/s of laminar flow rate of cooling simultaneously and obtain roll of steel plate；Section cooling speed is 16 DEG C/s, it is to control the precipitation strength of microalloy and solution strengthening, reach to control the structural transformation pattern such as pearlite, bainite, size, quantity and the purpose of distribution, to ensure that product has enough intensity and toughness by control coiling temperature simultaneously.
Step 6, step 5 is obtained roll of steel plate natural air cooling to room temperature, i.e. obtain high intensity, low yield strength ratio, thickness are the Q460 level antidetonation steel plate of 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 detailed description of the invention 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 are possessed, it is also possible to various changes can be made on the premise of without departing from present inventive concept.
Claims (3)
- null1. the method producing Q460 level shock resisting steel with steekle mill，It is characterized in that: first that slab is heated、After water spray dephosphorization，Same steckel mill is continuously finished roughing and finish rolling，Finish rolling gained steel plate send coiling machine batch through row，Natural air cooling is to room temperature again，I.e. obtain high intensity、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%，Remaining is Fe and other impurity；It specifically comprises the following steps thatStep 1, first slab heating under the conditions of temperature is 1230 ~ 1270 DEG C 130 ~ 260min, slab controlled at 45 ~ 65min in the time of soaking zone；Step 2, step 1 is processed after the slab water under high pressure positive and negative water jet descaling 11 ~ 16 seconds that uses pressure to be 18 ~ 22MPa；Step 3, send steckel mill to roll the step 2 slab after de-scaling, and to control start rolling temperature be 1080 ~ 1170 DEG C, carry out the continuous roughing of 4 ~ 7 passages, open simultaneously and cool down water between passage, obtain roughing steel plate；Step 4, the roughing steel plate that obtains through step 3 is continued steckel mill time delay 25 ~ 50 seconds, then making roughing steel billet temperature is 860 ~ 890 DEG C, carrying out the 4 continuous finish rolling of 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 11 ~ 16 DEG C/s of laminar flow rate of cooling simultaneously and obtain roll of steel plate；Step 6, step 5 is obtained roll of steel plate natural air cooling to room temperature, i.e. obtain high intensity, low yield strength ratio Q460 level antidetonation steel plate.
- Steekle mill the most according to claim 1 produces the method for Q460 level shock resisting steel, it is characterized in that: in described step 4, roughing steel plate continues steckel mill time delay 25 ~ 50 seconds, it is to allow roughing steel plate back and forth move about 25 ~ 50 seconds in ground roll, carry out finish rolling the most again, and control finish rolling total deformation rate more than 48%.
- Steekle mill the most according to claim 1 produces the method for Q460 level shock resisting steel, it is characterised in that: the road number of times during described step 3 and step 4, mill speed, require depending on different size and specifically determine.
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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 |
| CN112921242B (en) * | 2021-01-25 | 2022-03-04 | 广西柳钢华创科技研发有限公司 | Q460 grade building steel with low yield ratio and high toughness under air cooling |
| CN112921241B (en) * | 2021-01-25 | 2022-03-04 | 广西柳钢华创科技研发有限公司 | Production method of Q460 grade building steel with low yield ratio and high toughness under air cooling |
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|---|---|---|---|---|
| JPH10204570A (en) * | 1997-01-21 | 1998-08-04 | Nkk Corp | Earthquake resistant steel for structural purpose |
| JP2004162076A (en) * | 2002-09-25 | 2004-06-10 | Nippon Steel Corp | Steel plate excellent in weldability and earthquake resistance, and its production method |
| CN102433496A (en) * | 2011-12-16 | 2012-05-02 | 内蒙古包钢钢联股份有限公司 | Method for producing Q460 steel plate with single stand rolling mill |
| JP5998670B2 (en) * | 2012-06-27 | 2016-09-28 | Ｊｆｅスチール株式会社 | Low yield ratio high strength spiral steel pipe pile and manufacturing method thereof |
| CN103866188B (en) * | 2014-03-31 | 2016-01-20 | 武汉钢铁(集团)公司 | Yield strength is 460MPa level fire-resistant corrosion-resistant anti-seismic steel for building and production method |
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2014
- 2014-12-04 CN CN201410726007.1A patent/CN104561781B/en not_active Expired - Fee Related
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