CN106435376B - A kind of high intensity, the cold-rolled steel sheet of high yield elongation percentage and its manufacture method - Google Patents
A kind of high intensity, the cold-rolled steel sheet of high yield elongation percentage and its manufacture method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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Abstract
The invention belongs to advanced high-strength steel production technical field, and in particular to a kind of high intensity, the cold-rolled steel sheet of high yield elongation percentage and its manufacture method.The present invention cold-rolled steel sheet chemical composition be：C 0.15 ~ 0.3%, Mn 5 ~ 6%, N 0.05 ~ 0.12%, Si<0.2%, S<0.01%, P<0.01%, Al 0.002 ~ 0.04%, surplus Fe.The method of the present invention according to mentioned component through smelting and casting, hot rolling, soft annealing, pickling, cold rolling, reverse transformation anneal and etc. prepared.The present invention promotes the effects such as KESHI gas mass formation, solution strengthening and stable austenite using nitrogen, surrender elongation percentage is greatly improved while obtaining high strength cold rolled steel plate by the method for nitrogen microalloying.
Description
Technical field
The invention belongs to advanced high-strength steel production technical field, and in particular to a kind of high intensity, high yield elongation percentage it is cold
Rolled steel plate and its manufacture method.
Background technology
Advanced high-strength steel is the new type steel occurred in recent years, mainly including dual phase steel, TRIP steel, TWIP steel, medium managese steel
Deng being widely used in the industries such as automobile, science of bridge building, power transmission tower, ocean platform, pipe-line and shipbuilding.With biography
The rolled products of ordinary high-strength steel of system is compared, its maximum advantage be while mechanical property is ensured mitigate plate members thickness and
Weight, in addition, it also has the advantages that good formability, anticollision concavity, anti-fatigue performance, higher work hardening rate,
Good application prospect is shown in every profession and trade.Cold-rolled steel sheet is prone to surrender extension during room temperature tensile, is drawing
Stretch stress after showing as surrender on curve almost not raise with strain, this section of stress strain curve is almost horizontal line section, therefore claims to bend
Take platform.
Surrender extension is mainly as caused by the wrong pinning of KESHI gas mass and the equal contraposition of precipitation.This pinning effect is again
During machining deformation, dislocation is started the sufficiently large resolving shear stress of sliding needs, stress at this time be exactly often say it is upper in the wrong
Stress is taken, can be moved once dislocation shakes off pinning effect under relatively low resolving shear stress, has thereby resulted in upper and lower bend
The difference of clothes point stress.From the point of view of the mechanism of production of surrender extension, its appearance and Ke's formula air mass, crystallite dimension and annealing process
Etc. related.First, the interstitial atom such as carbon, nitrogen can carry out pinning to dislocation and form Ke's formula air mass in steel, improve surrender elongation percentage；
Secondly, fine grain has the yield strength of higher, once dislocation shakes off the pinning of interstitial atom, has on more parallel slip faces
Single sliding can start in succession, be consequently formed almost parallel glide band, cause to surrender elongation percentage raising；Finally, lehr attendant is adjusted
Skill parameter can also have an impact surrender elongation percentage.
Medium managese steel mainly contains three kinds of carbon, manganese, iron elements, carbon content exists as one kind in the advanced high-strength steel of the third generation
Between 0.1~0.6%, manganese content is between 3~12%.Since the addition of stable austenite element manganese, and reverse transformation are annealed
During carbon and manganese element diffusion and partition, medium managese steel can obtain 20~40% metastable retained austenite at room temperature.
Medium managese steel is mainly using austenite under outer stress TRIP effects to occur to realize with good obdurability, still
Medium managese steel cold-rolled steel sheet can also form surrender extension, but the surrender elongation percentage one of its acquisition when carrying out room temperature uniaxial tensile test
As be no more than 10%.Therefore a kind of high intensity is needed to take into account the medium managese steel cold-rolled steel sheet of high yield elongation percentage.
The content of the invention
In view of the problems of the existing technology, the present invention provide a kind of high intensity, high yield elongation percentage cold-rolled steel sheet and
Its manufacture method, by using nitrogen microalloying, improves surrender elongation percentage while cold-rolled steel sheet tensile strength is improved.
The high intensity of the present invention, the cold-rolled steel sheet of high yield elongation percentage, its chemical composition are according to mass percent：C
0.15~0.3%, Mn 5~6%, N 0.05~0.12%, Si<0.2%, S<0.01%, P<0.01%, Al 0.002~
0.04%, surplus Fe；
The cold-rolled steel sheet is organized as austenite and ferrite dual phase tissue, and thickness is 0.5~1.5mm, and tensile strength is
900~1000MPa, surrender elongation percentage are 20~35%.
Its manufacture method follows the steps below：
(1) smelt and cast：According to chemical composition C 0.15~0.3%, Mn 5~6%, N 0.05~0.12%, Si<
0.2%, S<0.01%, P<0.01%, Al 0.002~0.04%, surplus carry out dispensing for Fe, are smelted in the induction furnace that pressurizes
Molten steel, vacuumizes and liquid steel temperature is reached 1550~1650 DEG C；
The nitrogen that purity is 99.9993% is filled with when air pressure is less than 5Pa in stove, nitrogen pressure in furnace is reached 1~3
Atmospheric pressure, 4~6 atmospheric pressures are promoted to before casting by nitrogen pressure in furnace, need to continue pressurize after the completion of casting
10~50 minutes, obtain ingot casting；
(2) hot rolling：By ingot casting with stove heat to 1100~1200 DEG C and keep the temperature 1~2h, then pass through 7~9 passage hot rollings,
Start rolling temperature and finishing temperature are respectively 1060~1160 DEG C and 800~900 DEG C, are cooled to room after hot rolling in atmosphere
Temperature, obtains the hot rolled plate of 2~4mm thickness；
(3) soft annealing：By hot rolled plate with stove heat to 620~650 DEG C and keep the temperature 2~5h, be then air-cooled to room temperature, obtain
To soft annealing plate；
(4) pickling：It is 1 with volume ratio：4 hydrochloric acid and the mixed solution of water carry out pickling to soft annealing plate；
(5) cold rolling：Steel plate after pickling is cold-rolled to 0.5~1.5mm on cold-rolling mill, obtains cold-reduced sheet；
(6) reverse transformation is annealed：By cold-reduced sheet with stove heat to 620~650 DEG C and keep the temperature 0.5~15h, be then air-cooled to room
Temperature, obtains high intensity, high yield elongation percentage cold-rolled steel sheet.
Compared with prior art, the features of the present invention and beneficial effect are：
The cold-rolled steel sheet of the present invention utilizes nitrogen solution strengthening by adding the nitrogen that content is 0.05~0.12%
Effect with stable austenite improves intensity, and on the other hand, nitrogen advantageously forms more KESHI gas mass, strengthens to dislocation
Pinning effect, helps to improve surrender elongation percentage, in addition, nitride can pinning crystal boundary, effectively crystal grain thinning, further improves
Elongation percentage is surrendered, while nitrogen is unlikely to increase difficulty burden to smelting in this content range.It is produced by the present invention high-strength
Degree, high yield elongation percentage cold-rolled steel sheet tensile strength are up to 900~1000MPa, and surrender elongation percentage is up to 20~35%.
Control pressure change in manufacture method of the present invention is not spilt over to ensure nitrogen to dissolve in molten steel.In hot rolling
During soaking time and open, the control of finishing temperature is in order to ensure ingot structure complete austenitizing and homogenize, together
When roll after obtain the tiny microstructure of size.Soft annealing is to make the reduction of hot rolled plate hardness, can ensure that cold rolling is smooth
Carry out.The control of final thickness is to ensure sufficiently large deflection and fully Broken Crystal, thinning microstructure in cold-rolled process.
Reverse transformation annealing is to be changed into austenite to reverse martensite, finally obtains a large amount of metastable retained austenites in room temperature, so that
Improve the intensity of cold-rolled steel sheet.
Brief description of the drawings
Fig. 1 is the process flow diagram of manufacture method of the present invention；
In figure：Ac1It is the start temperature that austenite changes under heated condition；Ac3It is the end that austenite changes under heated condition
Temperature；
Fig. 2 be the embodiment of the present invention 1 obtain high intensity, the scanning electron of high yield elongation percentage cold-rolled steel sheet microstructure
Microscopy results；
Fig. 3 be the embodiment of the present invention 2 obtain high intensity, the scanning electron of high yield elongation percentage cold-rolled steel sheet microstructure
Microscopy results；
Fig. 4 be the embodiment of the present invention 3 obtain high intensity, the scanning electron of high yield elongation percentage cold-rolled steel sheet microstructure
Microscopy results；
Fig. 5 is the steel plate of the present invention typical project load-deformation curve that uniaxial tension obtains at ambient temperature.
Embodiment
The technological process of the present invention is as shown in Figure 1.
According to chemical composition C 0.15~0.3%, Mn 5~6%, N 0.05~0.12%, Si<0.2%, S<0.01%,
P<0.01%, Al 0.002~0.04%, surplus carry out dispensing for Fe, and the smelting molten steel in the induction furnace that pressurizes, vacuumizes and make
Liquid steel temperature reaches 1550~1650 DEG C；The nitrogen that purity is 99.9993% is filled with when air pressure is less than 5Pa in stove, is made in stove
Nitrogen pressure reaches 1~3 atmospheric pressure, and nitrogen pressure in furnace is promoted to 4~6 atmospheric pressures before casting, is poured
Need to continue pressurize 10~50 minutes after the completion of casting, obtain ingot casting；By ingot casting with stove heat to 1100~1200 DEG C and keep the temperature 1~
2h, then passes through the hot rolled plate that 7~9 passages are rolled into 2~4mm thickness, and start rolling temperature and finishing temperature are respectively 1060~1160
DEG C and 800~900 DEG C, be cooled to room temperature in atmosphere after hot rolling, obtain hot rolled plate；By hot rolled plate with stove heat to 620
~650 DEG C and 2~5h of insulation, room temperature is then air-cooled to, obtains soft annealing plate；It is 1 with volume ratio：4 hydrochloric acid and water it is mixed
Close solution and pickling is carried out to soft annealing plate；Steel plate after pickling is cold-rolled to 0.5~1.5mm on cold-rolling mill, obtains cold rolling
Plate；Cold-reduced sheet to 620~650 DEG C and is kept the temperature into 0.5~15h with stove heat, is then air-cooled to room temperature, high intensity is obtained, high bends
Take elongation percentage cold-rolled steel sheet, its typical project load-deformation curve that uniaxial tension obtains at ambient temperature as shown in figure 5,
As can be seen from Figure 5 it has high-tensile and high yield elongation percentage concurrently.
Embodiment 1
The chemical composition of advanced high-strength steel is shown in Table 1 in embodiment.
1 chemical composition of table (wt.%)
The manufacture method of the present embodiment follows the steps below：
(1) according to the ingredient composition of table 1, the smelting molten steel in the induction furnace that pressurizes, vacuumizes and reaches liquid steel temperature
1600℃；The nitrogen that purity is 99.9993% is filled with when air pressure is less than 5Pa in stove, nitrogen pressure in furnace is reached 2 air
Voltage levels, 5 atmospheric pressures are promoted to before casting by nitrogen pressure in furnace, need to continue pressurize 30 minutes after the completion of casting,
Obtain ingot casting；
(2) ingot casting to 1200 DEG C and is kept the temperature into 1h with stove heat, then passes through 8 passage hot rollings, start rolling temperature and finish to gauge temperature
Degree is respectively 1160 DEG C and 880 DEG C, is cooled to room temperature in atmosphere after hot rolling, obtains the hot rolled plate of 2.5mm thickness；
(3) hot rolled plate to 635 DEG C and is kept the temperature into 3h with stove heat, is then air-cooled to room temperature, obtains soft annealing plate；
(4) it is 1 with volume ratio：4 hydrochloric acid and the mixed solution of water carry out pickling to soft annealing plate；
(5) steel plate after pickling is cold-rolled to 0.7mm on cold-rolling mill, obtains cold-reduced sheet；
(6) cold-reduced sheet to 635 DEG C and is kept the temperature into 1h with stove heat, is then air-cooled to room temperature, such as Fig. 2 institutes of its micro-organization chart
Show, be austenite and ferrite dual phase tissue, it is 940MPa to obtain cold-rolled steel sheet tensile strength, and surrender elongation percentage is 32%.
Embodiment 2
The chemical composition of advanced high-strength steel is shown in Table 2 in embodiment.
2 chemical composition of table (wt.%)
The manufacture method of the present embodiment follows the steps below：
(1) according to the ingredient composition of table 2, the smelting molten steel in the induction furnace that pressurizes, vacuumizes and reaches liquid steel temperature
1580℃；The nitrogen that purity is 99.9993% is filled with when air pressure is less than 5Pa in stove, nitrogen pressure in furnace is reached 1 air
Voltage levels, 6 atmospheric pressures are promoted to before casting by nitrogen pressure in furnace, need to continue pressurize 50 minutes after the completion of casting,
Obtain ingot casting；
(2) ingot casting to 1150 DEG C and is kept the temperature into 1.5h with stove heat, then passes through 7 passage hot rollings, start rolling temperature and finish to gauge
Temperature is respectively 1080 DEG C and 850 DEG C, is cooled to room temperature in atmosphere after hot rolling, obtains the hot rolled plate of 4mm thickness
(3) hot rolled plate to 645 DEG C and is kept the temperature into 2h with stove heat, is then air-cooled to room temperature, obtains soft annealing plate；
(4) it is 1 with volume ratio：4 hydrochloric acid and the mixed solution of water carry out pickling to soft annealing plate；
(5) steel plate after pickling is cold-rolled to 1mm on cold-rolling mill, obtains cold-reduced sheet；
(6) cold-reduced sheet to 630 DEG C and is kept the temperature into 5h with stove heat, is then air-cooled to room temperature, its microscopic structure such as Fig. 3 institutes
Show, be austenite and ferrite dual phase tissue, obtained cold-rolled steel sheet tensile strength is 960MPa, and surrender elongation percentage is 25%.
Embodiment 3
The chemical composition of advanced high-strength steel is shown in Table 3 in embodiment.
3 chemical composition of table (wt.%)
The manufacture method of the present embodiment follows the steps below：
(1) according to the ingredient composition of table 3, the smelting molten steel in the induction furnace that pressurizes, vacuumizes and reaches liquid steel temperature
1600℃；The nitrogen that purity is 99.9993% is filled with when air pressure is less than 5Pa in stove, nitrogen pressure in furnace is reached 3 air
Voltage levels, 4 atmospheric pressures are promoted to before casting by nitrogen pressure in furnace, need to continue pressurize 20 minutes after the completion of casting,
Obtain ingot casting；
(2) ingot casting to 1100 DEG C and is kept the temperature into 2h with stove heat, then passes through 9 passage hot rollings, start rolling temperature and finish to gauge temperature
Degree is respectively 1060 DEG C and 820 DEG C, is cooled to room temperature in atmosphere after hot rolling, obtains the hot rolled plate of 3mm thickness；
(3) hot rolled plate to 650 DEG C and is kept the temperature into 5h with stove heat, is then air-cooled to room temperature, obtains soft annealing plate；
(4) it is 1 with volume ratio：4 hydrochloric acid and the mixed solution of water carry out pickling to soft annealing plate；
(5) steel plate after pickling is cold-rolled to 1.2mm on cold-rolling mill, obtains cold-reduced sheet；
(6) cold-reduced sheet to 640 DEG C and is kept the temperature into 10h with stove heat, is then air-cooled to room temperature, obtaining tensile strength is
920MPa, the cold-rolled steel sheet that surrender elongation percentage is 22%, its microscopic structure is as shown in figure 4, be austenite and ferrite dual phase group
Knit.
Comparative example 1
The chemical composition of advanced high-strength steel is shown in Table 4 in comparative example.
4 chemical composition of table (wt%)
Its preparation method is：
(1) according to the ingredient composition of table 4, the smelting molten steel in the induction furnace that pressurizes, vacuumizes and reaches liquid steel temperature
1600℃；The nitrogen that purity is 99.9993% is filled with when air pressure is less than 5Pa in stove, nitrogen pressure in furnace is reached 2 air
Voltage levels, 5 atmospheric pressures are promoted to before casting by nitrogen pressure in furnace, need to continue pressurize 20 minutes after the completion of casting,
Obtain ingot casting；
(2) ingot casting to 1180 DEG C and is kept the temperature into 2h with stove heat, then passes through the hot rolled plate that 9 passages are rolled into 3.5mm thickness,
Start rolling temperature and finishing temperature are respectively 1110 DEG C and 840 DEG C, are cooled to room temperature in atmosphere after hot rolling, obtain hot rolling
Plate.
(3) hot rolled plate to 625 DEG C and is kept the temperature into 3h with stove heat, is then air-cooled to room temperature, obtains soft annealing plate.
(4) it is 1 with volume ratio：4 hydrochloric acid and the mixed solution of water carry out pickling to soft annealing plate.
(5) steel plate after pickling is cold-rolled to 0.8mm on cold-rolling mill, obtains cold-reduced sheet.
(6) cold-reduced sheet to 620 DEG C and is kept the temperature into 10h with stove heat, is then air-cooled to room temperature, obtaining tensile strength is
820MPa, the cold-rolled steel sheet that surrender elongation percentage is 10%.
Comparative example 2
The chemical composition of advanced high-strength steel is shown in Table 5 in comparative example.
5 chemical composition of table (wt.%)
Its preparation method is：
(1) according to the ingredient composition of table 5, the smelting molten steel in the induction furnace that pressurizes, vacuumizes and reaches liquid steel temperature
1500℃；The nitrogen that purity is 99.9993% is filled with when air pressure is less than 5Pa in stove, nitrogen pressure in furnace is reached 2 air
Voltage levels, 4 atmospheric pressures are promoted to before casting by nitrogen pressure in furnace, need to continue pressurize 25 minutes after the completion of casting,
Obtain ingot casting；
(2) ingot casting to 1180 DEG C and is kept the temperature into 1h with stove heat, then passes through the hot rolled plate that 8 passages are rolled into 2.5mm thickness,
Start rolling temperature and finishing temperature are respectively 1110 DEG C and 820 DEG C, are cooled to room temperature in atmosphere after hot rolling, obtain hot rolling
Plate.
(3) hot rolled plate to 630 DEG C and is kept the temperature into 3h with stove heat, is then air-cooled to room temperature, obtains soft annealing plate.
(4) it is 1 with volume ratio：4 hydrochloric acid and the mixed solution of water carry out pickling to soft annealing plate.
(5) steel plate after pickling is cold-rolled to 0.8mm on cold-rolling mill, obtains cold-reduced sheet.
(6) cold-reduced sheet to 560 DEG C and is kept the temperature into 10h with stove heat, is then air-cooled to room temperature, obtaining tensile strength is
880MPa, the cold-rolled steel sheet that surrender elongation percentage is 8%.
Comparative example 3
The chemical composition of advanced high-strength steel is shown in Table 6 in comparative example.
6 chemical composition of table (wt.%)
Its preparation method is：
(1) according to the ingredient composition of table 6, the smelting molten steel in the induction furnace that pressurizes, vacuumizes and reaches liquid steel temperature
1500℃；The nitrogen that purity is 99.9993% is filled with when air pressure is less than 5Pa in stove, nitrogen pressure in furnace is reached 2 air
Voltage levels, 5 atmospheric pressures are promoted to before casting by nitrogen pressure in furnace, need to continue pressurize 45 minutes after the completion of casting,
Obtain ingot casting；
(2) ingot casting to 1190 DEG C and is kept the temperature into 1h with stove heat, then passes through the hot rolled plate that 9 passages are rolled into 2mm thickness, open
It is respectively 1130 DEG C and 830 DEG C to roll temperature and finishing temperature, is cooled to room temperature in atmosphere after hot rolling, obtains hot rolled plate.
(3) hot rolled plate to 630 DEG C and is kept the temperature into 4h with stove heat, is then air-cooled to room temperature, obtains soft annealing plate.
(4) it is 1 with volume ratio：4 hydrochloric acid and the mixed solution of water carry out pickling to soft annealing plate.
(5) steel plate after pickling is cold-rolled to 1mm on cold-rolling mill, obtains cold-reduced sheet.
(6) cold-reduced sheet to 635 DEG C and is kept the temperature into 24h with stove heat, is then air-cooled to room temperature, obtaining tensile strength is
900MPa, the cold-rolled steel sheet that surrender elongation percentage is 12%.
The contrast more than is as can be seen that the tensile strength of cold-rolled steel sheet or surrender elongation percentage are substantially less than this hair in comparative example
Bright implementation result.
Claims (1)
1. the manufacture method of the cold-rolled steel sheet of a kind of high intensity, high yield elongation percentage, it is characterised in that follow the steps below：
(1) smelt and cast：According to chemical composition C 0.15~0.3%, Mn 5~6%, N 0.05~0.06%, Si ＜
0.2%, S ＜ 0.01%, P ＜ 0.01%, Al 0.002~0.04%, surplus carry out dispensing, the smelting in the induction furnace that pressurizes for Fe
Water is made steel, vacuumizes and liquid steel temperature is reached 1550~1650 DEG C；
The nitrogen that purity is 99.9993% is filled with when air pressure is less than 5Pa in stove, nitrogen pressure in furnace is reached 1~3 air
Voltage levels, 4~6 atmospheric pressures are promoted to before casting by nitrogen pressure in furnace, needed after the completion of casting continue pressurize 10~
50 minutes, obtain ingot casting；
(2) hot rolling：By ingot casting with stove heat to 1100~1200 DEG C and keep the temperature 1~2h, then pass through 7~9 passage hot rollings, open rolling
Temperature and finishing temperature are respectively 1060~1160 DEG C and 800~880 DEG C, are cooled to room temperature in atmosphere after hot rolling, are obtained
To the hot rolled plate of 2~4mm thickness；
(3) soft annealing：By hot rolled plate with stove heat to 620~650 DEG C and keep the temperature 2~5h, be then air-cooled to room temperature, obtain soft
Annealing plate；
(4) pickling：Pickling is carried out to soft annealing plate with the hydrochloric acid and the mixed solution of water that volume ratio is 1: 4；
(5) cold rolling：Steel plate after pickling is cold-rolled to 0.5~1.5mm on cold-rolling mill, obtains cold-reduced sheet；
(6) reverse transformation is annealed：By cold-reduced sheet with stove heat to 620~650 DEG C and keep the temperature 0.5~15h, be then air-cooled to room temperature,
High intensity, high yield elongation percentage cold-rolled steel sheet are obtained, the cold-rolled steel sheet is organized as austenite and ferrite dual phase tissue, thickness
For 0.5~1.5mm, tensile strength is 900~1000MPa, and surrender elongation percentage is 20~35%.
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