CN104694824B - Inexpensive automotive frame hot rolled steel plate and production method - Google Patents
Inexpensive automotive frame hot rolled steel plate and production method Download PDFInfo
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- CN104694824B CN104694824B CN201510138037.5A CN201510138037A CN104694824B CN 104694824 B CN104694824 B CN 104694824B CN 201510138037 A CN201510138037 A CN 201510138037A CN 104694824 B CN104694824 B CN 104694824B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 132
- 239000010959 steel Substances 0.000 title claims abstract description 132
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 53
- 238000005096 rolling process Methods 0.000 claims abstract description 77
- 239000000126 substance Substances 0.000 claims abstract description 35
- 239000000203 mixture Substances 0.000 claims abstract description 33
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 14
- 229910001562 pearlite Inorganic materials 0.000 claims abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 103
- 238000009749 continuous casting Methods 0.000 claims description 53
- 229910052742 iron Inorganic materials 0.000 claims description 38
- 239000012535 impurity Substances 0.000 claims description 27
- 238000005266 casting Methods 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 17
- 238000005098 hot rolling Methods 0.000 claims description 16
- 239000000470 constituent Substances 0.000 claims description 12
- 238000009434 installation Methods 0.000 claims description 12
- 239000011572 manganese Substances 0.000 abstract description 11
- 229910052748 manganese Inorganic materials 0.000 abstract description 9
- 229910052758 niobium Inorganic materials 0.000 abstract description 9
- 239000010936 titanium Substances 0.000 abstract description 9
- 229910052720 vanadium Inorganic materials 0.000 abstract description 7
- 229910052719 titanium Inorganic materials 0.000 abstract description 5
- 229910045601 alloy Inorganic materials 0.000 abstract description 3
- 239000000956 alloy Substances 0.000 abstract description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 abstract description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract description 2
- 239000010955 niobium Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 238000005275 alloying Methods 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910000885 Dual-phase steel Inorganic materials 0.000 description 1
- 229910000742 Microalloyed steel Inorganic materials 0.000 description 1
- 229910001275 Niobium-titanium Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000002929 anti-fatigue Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- RJSRQTFBFAJJIL-UHFFFAOYSA-N niobium titanium Chemical group [Ti].[Nb] RJSRQTFBFAJJIL-UHFFFAOYSA-N 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a kind of inexpensive automotive frame hot rolled steel plate and production method, the hot rolled steel plate has the chemical composition of following mass percent：C：0.05% 0.10%；Si：0.10% 0.35%；Mn：0.70% 0.95%；P：≤ 0.025%；S：≤ 0.015%；Ti：0.020% 0.050%；The present invention is using titanium, manganese microalloying mode, avoid the noble elements such as addition V, Nb, produce the high-strength and low-cost automotive frame hot rolled steel plate of ferrite and pearlite tissue, its more than yield strength 355MPa, the 620MPa of tensile strength 510, elongation percentage more than 24%, with stable mechanical property, obdurability matching is good and the characteristics of excellent processability.Steel grade cost of alloy of the present invention is low, rolling mill practice control is simple and adaptability is stronger, with preferable popularizing application prospect.
Description
Technical field
The present invention relates to hot-rolling plate band production technical field, more particularly to a kind of inexpensive automotive frame hot rolled steel plate
And production method.
Background technology
Steel for automobile crossbeam is mainly used in the major part of the vehicle frame of punch forming automobile, such as longeron, crossbeam and connector
Deng, and vehicle frame not only needs to bear the weight of auto parts and components, loading capacity, and needs bear to be received in vehicle traveling process
To the effect of the complex stresses such as various impacts, torsion, use condition is very harsh, therefore steel for automobile crossbeam is not required nothing more than and had
Intensity higher, in addition it is also necessary to good plasticity, toughness, anti-fatigue performance and processability etc..
Domestic and international steel for automobile crossbeam reaches the technical requirements of steel for automobile crossbeam using multiple technologies route, such as develops
Dual phase steel, Multiphase Steel etc., but these technology path production costs are high, and the technological equipment Capability Requirement to hot continuous rolling is very high,
Therefore, the steel for automobile crossbeam of yield strength intensity 355MPa is still produced using the technology path of micro alloyed steel.
Patent ZL200710048767.1, entitled patent hot-rolled steel sheet for automobile and its production method, it is mainly changed
Study and be divided into：C：0.07%-0.12%, Si：0.10%-0.30%, Mn：1.05%-1.25%, P≤0.025%, S≤
0.015%, V：0.06%-0.10%；Patent name is niobium-titanium composite beam steel of light truck and preparation method thereof (patent
Publication number CN101914728A), its chemical composition is：C：0.09%-0.15%, Si：0.30%-0.60%, Mn：1.25%-
1.50%, P≤0.030%, S≤0.030%, Nb：0.015%-0.045%, Ti：0.010-0.030%；Patent name is vapour
The low-niobium strengthened production process (patent publication No. 101892421A) of crossbeam steel, its chemical composition is：C：0.085%-
0.115%, Si：0.154%-0.254%, Mn：1.4%-1.55%, P≤0.015%, S≤0.008%, Nb：0.008%-
0.014%；Patent name is the surface iron scale control method (patent publication No. of hot-rolled steel sheet for automobile containing vanadium
CN101147920), its chemical composition is：C：0.06%-0.12%, Si≤0.30%, Mn：1.05%-1.25%, P≤
0.025%, S≤0.015%, V：0.04%-0.10%；Patent name is that a kind of steel for automobile crossbeam and its temperature control method are (special
Sharp publication number CN101698926A), its chemical composition is：C：0.08%-0.13%, Si≤0.3%, Mn：0.90%-
1.15%, P ＜ 0.010%, S ＜ 0.010%, Nb：0.03%-0.05%；Patent name is used for a kind of inexpensive automotive frame
Steel and its manufacture method (patent publication No. CN102212747A), its chemical composition is：C：0.06%-0.12%, Si：
0.08%-0.20%, Mn：1.00%-1.40%, P≤0.015%, S≤0.008%, Nb：0.015%-0.030%.It is above-mentioned
Contain precious metal Nb or V in the steel for automobile crossbeam of invention, its cost of alloy is higher.Patent name is a kind of 510MPa
Level automotive frame hot-rolling plate strip and its production technology (patent publication No. CN103451535A), its chemical composition is：C：
0.13~0.18%, Si：0.30~0.50%, Mn：0.75~1.15%, P≤0.025%, S≤0.008%, Ti：0.008~
0.025%Ti, only adds cheap a small amount of Ti, without any other expensive alloying elements, reduces production cost, but
Its C content is high, in actual production, easily forms banded structure, causes steel plate plasticity poor, cold-bending property and welding performance
Difference, easily ftractures in forming process.
The content of the invention
Part, hot it is an object of the invention to provide a kind of inexpensive automotive frame in view of the shortcomings of the prior art
Rolled steel plate and production method, employ V, Nb microalloying mode, its more than hot rolled steel plate yield strength 355MPa, tensile strength
510-620MPa, elongation percentage more than 24%, with stable mechanical property, obdurability matches the good and excellent spy of processability
Point.
The purpose of the present invention is achieved through the following technical solutions：
A kind of inexpensive automotive frame hot rolled steel plate, the hot rolled steel plate have following mass percent chemistry into
Point：
Balance of Fe and inevitable impurity；
The institutional framework of the hot rolled steel plate is ferrite or/and pearlite, and its grain size is 10.0~12.0.
Further preferred hot rolled steel plate chemical constituent is：The hot rolled steel plate have following mass percent chemistry into
Point：
Balance of Fe and inevitable impurity；
It is as follows that the present invention provides a kind of preferred hot rolled steel plate chemical constituent：The hot rolled steel plate has following quality percentage
The chemical composition of ratio：
Balance of Fe and inevitable impurity；
Preferably, described hot rolled steel plate has following performances：
Yield strength： ≥500Mpa；
Tensile strength：610~720MPa；
Elongation percentage：>=22%；
The step of a kind of production method of inexpensive automotive frame hot rolled steel plate, production method, is as follows：
Step A：Cast continuous casting billet
Iron is melted into molten iron, the molten iron containing following chemical composition mass percents is casting continuously to form company using continuous casting installation for casting
Strand：
Balance of Fe and inevitable impurity；
Step B：Roughing is batched with Coil Box is sent；
The continuous casting billet that step A is obtained is heated to 1200~1260 DEG C of temperature using furnace apparatus, roughing is then used by
Machine equipment carries out roughing into intermediate slab；Then batched using mandrelless transform Coil Box, turn intermediate slab carries out finish rolling end to end；
Step C：Finish rolling with batch
Be then used by continuous hot rolling facility carries out finish rolling to the intermediate slab that the step B is obtained, in finish rolling by entrance temperature
Degree control is rolled at 980~1050 DEG C, and rolling temperature control is 850~920 DEG C；With rate of temperature fall 10~20 after rolling
DEG C/s is cooled to 570~650 DEG C of temperature and batches, finally obtain described inexpensive automotive frame hot rolled steel plate.
There are following performances by inexpensive automotive frame hot rolled steel plate obtained in aforementioned production method：
Yield strength： ≥355Mpa；
Tensile strength：510~620MPa；
Elongation percentage：>=24%.
Preferably, the thickness of the continuous casting billet is 200~230mm.
Preferably, the thickness of the intermediate slab is 32~46mm.
Preferably, the thickness of the inexpensive automotive frame hot rolled steel plate is 3.0~10.0mm.
The present invention compared with the prior art, with advantages below and beneficial effect：
The present invention is using titanium, manganese microalloying mode, it is to avoid the noble element such as addition V, Nb, produces ferrite and pearl
The high-strength and low-cost automotive frame hot rolled steel plate of body of light tissue, its more than yield strength 355MPa, tensile strength 510-
620MPa, elongation percentage more than 24%, with stable mechanical property, obdurability matching is good and the characteristics of excellent processability.This
Invention steel grade cost of alloy is low, rolling mill practice control is simple and adaptability is stronger, with preferable popularizing application prospect.
Specific embodiment
The present invention is described in further detail with reference to embodiment：
A kind of inexpensive automotive frame hot rolled steel plate, the hot rolled steel plate have following mass percent chemistry into
Point：
Balance of Fe and inevitable impurity；
The institutional framework of the hot rolled steel plate is ferrite or/and pearlite, and its grain size is 10.0~12.0.
The hot rolled steel plate has the chemical composition of following mass percent：
Balance of Fe and inevitable impurity；
The hot rolled steel plate has the chemical composition of following mass percent：
Balance of Fe and inevitable impurity；
Described hot rolled steel plate has following performances：
Yield strength： ≥355Mpa；
Tensile strength：510~620MPa；
Elongation percentage：>=24%；
A kind of production method of inexpensive automotive frame hot rolled steel plate, the present invention provides following 10 embodiments, to this
Invention is described in further detail.
The production method flow of this inexpensive automotive frame hot rolled steel plate is as follows：Step A：Cast continuous casting billet → step B：
Roughing batches → step C with Coil Box is sent：Finish rolling with batch；
According to aforementioned production method flow, in a specific embodiment, currently preferred specific method flow is as follows：Iron
Water desulfurization → converter smelting top-bottom blowing → deoxidation, alloying and after the concise slag desulfurization → stove of high alkalinity chain-wales mend feed Al lines,
Ti microalloyings → hello calcium line → continuous casting → heating of plate blank → high-pressure water descaling → roughing → Coil Box batches → finish rolling → laminar flow
Cool down → batch → packaging and storage.
Embodiment 1
The step of a kind of production method of inexpensive automotive frame hot rolled steel plate, production method, is as follows：
Step A：Cast continuous casting billet
Iron is melted into molten iron, the molten iron continuous casting of following chemical composition mass percents will be contained using continuous casting installation for casting equipment
Into continuous casting billet：
Balance of Fe and inevitable impurity；
Step B：Roughing is batched with Coil Box is sent；
The continuous casting billet that step A is obtained is heated to 1235 DEG C of temperature using furnace apparatus, be then used by _ _ _ roughing mill sets
It is standby to carry out roughing into intermediate slab；Then batched using mandrelless transform Coil Box, turn intermediate slab carries out finish rolling end to end；
Step C：Finish rolling with batch
Be then used by continuous hot rolling facility carries out finish rolling to the intermediate slab that the step B is obtained, in finish rolling by entrance temperature
Degree control is rolled at 1008 DEG C, and rolling temperature control is 872 DEG C；Temperature is cooled to 10 DEG C/s of rate of temperature fall after rolling
605 DEG C are batched, and finally obtain described inexpensive automotive frame hot rolled steel plate；
The thickness of the continuous casting billet is 200mm.
The thickness of the intermediate slab is 32mm.
The thickness of the inexpensive automotive frame hot rolled steel plate is 8.0mm.
The mechanical property of the hot rolled steel plate coil of strip obtained according to the production method of embodiment 1 is as follows：Yield strength (ReL)：
445MPa, tensile strength (Rm)：550MPa, elongation percentage (A) 27.5%, clod wash B=35, α=180 °, d=0：It is qualified.It is above-mentioned each
Item index reaches the predetermined mechanical property of hot rolled steel plate, i.e., reached hot rolled steel plate of the present invention using the method for embodiment 1
Mechanical performance index.
Embodiment 2
The step of a kind of production method of inexpensive automotive frame hot rolled steel plate, production method, is as follows：
Step A：Cast continuous casting billet
Iron is melted into molten iron, the molten iron containing following chemical composition mass percents is casting continuously to form company using continuous casting installation for casting
Strand：
Balance of Fe and inevitable impurity；
Step B：Roughing is batched with Coil Box is sent；
The continuous casting billet that step A is obtained is heated to 1245 DEG C of temperature using furnace apparatus, roughing machine equipment is then used by
Carry out roughing into intermediate slab；Then batched using mandrelless transform Coil Box, turn intermediate slab carries out finish rolling end to end；
Step C：Finish rolling with batch
Be then used by continuous hot rolling facility carries out finish rolling to the intermediate slab that the step B is obtained, in finish rolling by entrance temperature
Degree control is rolled at 995 DEG C, and rolling temperature control is 893 DEG C；Temperature 590 is cooled to 12 DEG C/s of rate of temperature fall after rolling
DEG C batch, finally obtain described inexpensive automotive frame hot rolled steel plate.
Preferably, the thickness of the continuous casting billet is 230mm.
Preferably, the thickness of the intermediate slab is 34mm.
Preferably, the thickness of the inexpensive automotive frame hot rolled steel plate is 9.8mm.
The mechanical property of the hot rolled steel plate coil of strip obtained according to the production method of embodiment 2 is as follows：Yield strength (ReL)：
430MPa, tensile strength (Rm)：540MPa, elongation percentage (A) 30.0%, clod wash B=35, α=180 °, d=0：It is qualified.It is above-mentioned each
Item index reaches the predetermined mechanical property of hot rolled steel plate, i.e., reached hot rolled steel plate of the present invention using the method for embodiment 2
Mechanical performance index.
Embodiment 3
The step of a kind of production method of inexpensive automotive frame hot rolled steel plate, production method, is as follows：
Step A：Cast continuous casting billet
Iron is melted into molten iron, the molten iron containing following chemical composition mass percents is casting continuously to form company using continuous casting installation for casting
Strand：
Balance of Fe and inevitable impurity；
Step B：Roughing is batched with Coil Box is sent；
The continuous casting billet that step A is obtained is heated to 1238 DEG C of temperature using furnace apparatus, roughing machine equipment is then used by
Carry out roughing into intermediate slab；Then batched using mandrelless transform Coil Box, turn intermediate slab carries out finish rolling end to end；
Step C：Finish rolling with batch
Be then used by continuous hot rolling facility carries out finish rolling to the intermediate slab that the step B is obtained, in finish rolling by entrance temperature
Degree control is rolled at 1007 DEG C, and rolling temperature control is 885 DEG C；Temperature is cooled to 14 DEG C/s of rate of temperature fall after rolling
633 DEG C are batched, and finally obtain described inexpensive automotive frame hot rolled steel plate.
Preferably, in step, the thickness of the continuous casting billet is 210mm.
Preferably, in stepb, the thickness of the intermediate slab is 34mm.
Preferably, in step C, the thickness of the inexpensive automotive frame hot rolled steel plate is 5.5mm.
The mechanical property of the hot rolled steel plate coil of strip obtained according to the production method of embodiment 3 is as follows：Yield strength (ReL)：
450MPa, tensile strength (Rm)：570MPa, elongation percentage (A) 27.0%, clod wash B=35, α=180 °, d=0：It is qualified.It is above-mentioned each
Item index reaches the predetermined mechanical property of hot rolled steel plate, i.e., reached hot rolled steel plate of the present invention using the method for embodiment 3
Mechanical performance index.
Embodiment 4
The step of a kind of production method of inexpensive automotive frame hot rolled steel plate, production method, is as follows：
Step A：Cast continuous casting billet
Iron is melted into molten iron, the molten iron containing following chemical composition mass percents is casting continuously to form company using continuous casting installation for casting
Strand：
Balance of Fe and inevitable impurity；
Step B：Roughing is batched with Coil Box is sent；
The continuous casting billet that step A is obtained is heated to 1223 DEG C of temperature using furnace apparatus, roughing machine equipment is then used by
Carry out roughing into intermediate slab；Then batched using mandrelless transform Coil Box, turn intermediate slab carries out finish rolling end to end；
Step C：Finish rolling with batch
Be then used by continuous hot rolling facility carries out finish rolling to the intermediate slab that the step B is obtained, in finish rolling by entrance temperature
Degree control is rolled at 1025 DEG C, and rolling temperature control is 892 DEG C；Temperature is cooled to 14 DEG C/s of rate of temperature fall after rolling
625 DEG C are batched, and finally obtain described inexpensive automotive frame hot rolled steel plate.
Preferably, in step, the thickness of the continuous casting billet is 210mm.
Preferably, in stepb, the thickness of the intermediate slab is 34mm.
Preferably, in step C, the thickness of the inexpensive automotive frame hot rolled steel plate is 6.0mm.
The mechanical property of the hot rolled steel plate coil of strip obtained according to the production method of embodiment 4 is as follows：Yield strength (ReL)：
440MPa, tensile strength (Rm)：565MPa, elongation percentage (A) 28.5%, clod wash B=35, α=180 °, d=0：It is qualified.It is above-mentioned each
Item index reaches the predetermined mechanical property of hot rolled steel plate, i.e., reached hot rolled steel plate of the present invention using the method for embodiment 4
Mechanical performance index.
Embodiment 5
The step of a kind of production method of inexpensive automotive frame hot rolled steel plate, production method, is as follows：
Step A：Cast continuous casting billet
Iron is melted into molten iron, the molten iron containing following chemical composition mass percents is casting continuously to form company using continuous casting installation for casting
Strand：
Balance of Fe and inevitable impurity；
Step B：Roughing is batched with Coil Box is sent；
The continuous casting billet that step A is obtained is heated to 1238 DEG C of temperature using furnace apparatus, roughing machine equipment is then used by
Carry out roughing into intermediate slab；Then batched using mandrelless transform Coil Box, turn intermediate slab carries out finish rolling end to end；
Step C：Finish rolling with batch
Be then used by continuous hot rolling facility carries out finish rolling to the intermediate slab that the step B is obtained, in finish rolling by entrance temperature
Degree control is rolled at 998 DEG C, and rolling temperature control is 878 DEG C；Temperature 623 is cooled to 16 DEG C/s of rate of temperature fall after rolling
DEG C batch, finally obtain described inexpensive automotive frame hot rolled steel plate.
Preferably, in step, the thickness of the continuous casting billet is 215mm.
Preferably, in stepb, the thickness of the intermediate slab is 35mm.
Preferably, in step C, the thickness of the inexpensive automotive frame hot rolled steel plate is 6.5mm.
The mechanical property of the hot rolled steel plate coil of strip obtained according to the production method of embodiment 5 is as follows：Yield strength (ReL)：
435MPa, tensile strength (Rm)：535MPa, elongation percentage (A) 29.0%, clod wash B=35, α=180 °, d=0：It is qualified.It is above-mentioned each
Item index reaches the predetermined mechanical property of hot rolled steel plate, i.e., reached hot rolled steel plate of the present invention using the method for embodiment 5
Mechanical performance index.
Embodiment 6
The step of a kind of production method of inexpensive automotive frame hot rolled steel plate, production method, is as follows：
Step A：Cast continuous casting billet
Iron is melted into molten iron, the molten iron containing following chemical composition mass percents is casting continuously to form company using continuous casting installation for casting
Strand：
Balance of Fe and inevitable impurity；
Step B：Roughing is batched with Coil Box is sent；
The continuous casting billet that step A is obtained is heated to 1240 DEG C of temperature using furnace apparatus, roughing machine equipment is then used by
Carry out roughing into intermediate slab；Then batched using mandrelless transform Coil Box, turn intermediate slab carries out finish rolling end to end；
Step C：Finish rolling with batch
Be then used by continuous hot rolling facility carries out finish rolling to the intermediate slab that the step B is obtained, in finish rolling by entrance temperature
Degree control is rolled at 1007 DEG C, and rolling temperature control is 878 DEG C；Temperature is cooled to 15 DEG C/s of rate of temperature fall after rolling
635 DEG C are batched, and finally obtain described inexpensive automotive frame hot rolled steel plate.
Preferably, in step, the thickness of the continuous casting billet is 200mm.
Preferably, in stepb, the thickness of the intermediate slab is 30mm.
Preferably, in step C, the thickness of the inexpensive automotive frame hot rolled steel plate is 6.5mm.
The mechanical property of the hot rolled steel plate coil of strip obtained according to the production method of embodiment 6 is as follows：Yield strength (ReL)：
435MPa, tensile strength (Rm)：555MPa, elongation percentage (A) 30.0%, clod wash B=35, α=180 °, d=0：It is qualified.It is above-mentioned each
Item index reaches the predetermined mechanical property of hot rolled steel plate, i.e., reached hot rolled steel plate of the present invention using the method for embodiment 6
Mechanical performance index.
Embodiment 7
The step of a kind of production method of inexpensive automotive frame hot rolled steel plate, production method, is as follows：
Step A：Cast continuous casting billet
Iron is melted into molten iron, the molten iron containing following chemical composition mass percents is casting continuously to form company using continuous casting installation for casting
Strand：
Balance of Fe and inevitable impurity；
Step B：Roughing is batched with Coil Box is sent；
The continuous casting billet that step A is obtained is heated to 1244 DEG C of temperature using furnace apparatus, roughing machine equipment is then used by
Carry out roughing into intermediate slab；Then batched using mandrelless transform Coil Box, turn intermediate slab carries out finish rolling end to end；
Step C：Finish rolling with batch
Be then used by continuous hot rolling facility carries out finish rolling to the intermediate slab that the step B is obtained, in finish rolling by entrance temperature
Degree control is rolled at 998 DEG C, and rolling temperature control is 886 DEG C；Temperature 602 is cooled to 18 DEG C/s of rate of temperature fall after rolling
DEG C batch, finally obtain described inexpensive automotive frame hot rolled steel plate.
Preferably, in step, the thickness of the continuous casting billet is 220mm.
Preferably, in stepb, the thickness of the intermediate slab is 40mm.
Preferably, in step C, the thickness of the inexpensive automotive frame hot rolled steel plate is 8.0mm.
The mechanical property of the hot rolled steel plate coil of strip obtained according to the production method of embodiment 7 is as follows：Yield strength (ReL)：
430MPa, tensile strength (Rm)：555MPa, elongation percentage (A) 31.5%, clod wash B=35, α=180 °, d=0：It is qualified.It is above-mentioned each
Item index reaches the predetermined mechanical property of hot rolled steel plate, i.e., reached hot rolled steel plate of the present invention using the method for embodiment 7
Mechanical performance index.
Embodiment 8
The step of a kind of production method of inexpensive automotive frame hot rolled steel plate, production method, is as follows：
Step A：Cast continuous casting billet
Iron is melted into molten iron, the molten iron containing following chemical composition mass percents is casting continuously to form company using continuous casting installation for casting
Strand：
Balance of Fe and inevitable impurity；
Step B：Roughing is batched with Coil Box is sent；
The continuous casting billet that step A is obtained is heated to 1237 DEG C of temperature using furnace apparatus, roughing machine equipment is then used by
Carry out roughing into intermediate slab；Then batched using mandrelless transform Coil Box, turn intermediate slab carries out finish rolling end to end；
Step C：Finish rolling with batch
Be then used by continuous hot rolling facility carries out finish rolling to the intermediate slab that the step B is obtained, in finish rolling by entrance temperature
Degree control is rolled at 1023 DEG C, and rolling temperature control is 893 DEG C；Temperature is cooled to 20 DEG C/s of rate of temperature fall after rolling
616 DEG C are batched, and finally obtain described inexpensive automotive frame hot rolled steel plate.
Preferably, in step, the thickness of the continuous casting billet is 220mm.
Preferably, in stepb, the thickness of the intermediate slab is 42mm.
Preferably, in step C, the thickness of the inexpensive automotive frame hot rolled steel plate is 5.0mm.
The mechanical property of the hot rolled steel plate coil of strip obtained according to the production method of embodiment 8 is as follows：Yield strength (ReL)：
445MPa, tensile strength (Rm)：540MPa, elongation percentage (A) 30.5%, clod wash B=35, α=180 °, d=0：It is qualified.It is above-mentioned each
Item index reaches the predetermined mechanical property of hot rolled steel plate, i.e., reached hot rolled steel plate of the present invention using the method for embodiment 8
Mechanical performance index.
Embodiment 9
The step of a kind of production method of inexpensive automotive frame hot rolled steel plate, production method, is as follows：
Step A：Cast continuous casting billet
Iron is melted into molten iron, the molten iron containing following chemical composition mass percents is casting continuously to form company using continuous casting installation for casting
Strand：
Balance of Fe and inevitable impurity；
Step B：Roughing is batched with Coil Box is sent；
The continuous casting billet that step A is obtained is heated to 1248 DEG C of temperature using furnace apparatus, roughing machine equipment is then used by
Carry out roughing into intermediate slab；Then batched using mandrelless transform Coil Box, turn intermediate slab carries out finish rolling end to end；
Step C：Finish rolling with batch
Be then used by continuous hot rolling facility carries out finish rolling to the intermediate slab that the step B is obtained, in finish rolling by entrance temperature
Degree control is rolled at 997 DEG C, and rolling temperature control is 897 DEG C；Temperature 625 is cooled to 19 DEG C/s of rate of temperature fall after rolling
DEG C batch, finally obtain described inexpensive automotive frame hot rolled steel plate.
Preferably, in step, the thickness of the continuous casting billet is 210mm.
Preferably, in stepb, the thickness of the intermediate slab is 44mm.
Preferably, in step C, the thickness of the inexpensive automotive frame hot rolled steel plate is 7.0mm.
The mechanical property of the hot rolled steel plate coil of strip obtained according to the production method of embodiment 9 is as follows：Yield strength (ReL)：
440MPa, tensile strength (Rm)：540MPa, elongation percentage (A) 36.0%, clod wash B=35, α=180 °, d=0：It is qualified.It is above-mentioned each
Item index reaches the predetermined mechanical property of hot rolled steel plate, i.e., reached hot rolled steel plate of the present invention using the method for embodiment 9
Mechanical performance index.
Embodiment 10
The step of a kind of production method of inexpensive automotive frame hot rolled steel plate, production method, is as follows：
Step A：Cast continuous casting billet
Iron is melted into molten iron, the molten iron containing following chemical composition mass percents is casting continuously to form company using continuous casting installation for casting
Strand：
Balance of Fe and inevitable impurity；
Step B：Roughing is batched with Coil Box is sent；
The continuous casting billet that step A is obtained is heated to 1225 DEG C of temperature using furnace apparatus, roughing machine equipment is then used by
Carry out roughing into intermediate slab；Then batched using mandrelless transform Coil Box, turn intermediate slab carries out finish rolling end to end；
Step C：Finish rolling with batch
Be then used by continuous hot rolling facility carries out finish rolling to the intermediate slab that the step B is obtained, in finish rolling by entrance temperature
Degree control is rolled at 1015 DEG C, and rolling temperature control is 882 DEG C；Temperature is cooled to 20 DEG C/s of rate of temperature fall after rolling
613 DEG C are batched, and finally obtain described inexpensive automotive frame hot rolled steel plate.
Preferably, in step, the thickness of the continuous casting billet is 230mm.
Preferably, in stepb, the thickness of the intermediate slab is 46mm.
Preferably, in step C, the thickness of the inexpensive automotive frame hot rolled steel plate is 8.0mm.
The mechanical property of the hot rolled steel plate coil of strip obtained according to the production method of embodiment 7 is as follows：Yield strength (ReL)：
430MPa, tensile strength (Rm)：530MPa, elongation percentage (A) 31.5%, clod wash B=35, α=180 °, d=0：It is qualified.It is above-mentioned each
Item index reaches the predetermined mechanical property of hot rolled steel plate, i.e., reached hot rolled steel plate of the present invention using the method for embodiment 7
Mechanical performance index.
Here is the machined parameters summary sheet of 1~embodiment of embodiment 10, and wherein table 1 is 10 embodiments of the invention
Chemical composition, table 2 is hot rolling technology controlling value, the mechanical property of the hot rolled steel plate coil of strip that 30 embodiments of table are processed respectively
Energy.
The chemical composition of the embodiment of table 1
| Embodiment | C | Si | Mn | P | S | Ti |
| 1 | 0.09 | 0.15 | 0.78 | 0.014 | 0.008 | 0.037 |
| 2 | 0.08 | 0.26 | 0.82 | 0.016 | 0.005 | 0.042 |
| 3 | 0.07 | 0.28 | 0.84 | 0.014 | 0.009 | 0.030 |
| 4 | 0.07 | 0.24 | 0.81 | 0.013 | 0.006 | 0.045 |
| 5 | 0.06 | 0.26 | 0.88 | 0.018 | 0.005 | 0.037 |
| 6 | 0.09 | 0.26 | 0.82 | 0.020 | 0.006 | 0.043 |
| 7 | 0.06 | 0.22 | 0.85 | 0.014 | 0.004 | 0.048 |
| 8 | 0.07 | 0.17 | 0.82 | 0.019 | 0.006 | 0.036 |
| 9 | 0.08 | 0.28 | 0.83 | 0.018 | 0.008 | 0.047 |
| 10 | 0.06 | 0.27 | 0.84 | 0.013 | 0.009 | 0.042 |
The hot rolling technology controlling value of the embodiment of table 2
The mechanical property of the coil of strip of the embodiment of table 3
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (5)
1. a kind of inexpensive automotive frame hot rolled steel plate, it is characterised in that the hot rolled steel plate has following ten kinds of components：
The chemical composition of the first constituent mass percentage is：
Balance of Fe and inevitable impurity；
The institutional framework of the hot rolled steel plate is ferrite or/and pearlite, and its grain size is 10.0~12.0；
Described hot rolled steel plate has following performances：
Yield strength： 445Mpa；
Tensile strength： 550MPa；
Elongation percentage：27.5%；
The chemical composition of second constituent mass percentage is：
Balance of Fe and inevitable impurity；
The institutional framework of the hot rolled steel plate is ferrite or/and pearlite, and its grain size is 10.0~12.0；
Described hot rolled steel plate has following performances：
Yield strength： 430Mpa；
Tensile strength： 540MPa；
Elongation percentage：30.0%；
The chemical composition of the third constituent mass percentage is：
Balance of Fe and inevitable impurity；
The institutional framework of the hot rolled steel plate is ferrite or/and pearlite, and its grain size is 10.0~12.0；
Described hot rolled steel plate has following performances：
Yield strength： 450Mpa；
Tensile strength： 570MPa；
Elongation percentage：27.0%；
The chemical composition of the 4th kind of constituent mass percentage is：
Balance of Fe and inevitable impurity；
The institutional framework of the hot rolled steel plate is ferrite or/and pearlite, and its grain size is 10.0~12.0；
Described hot rolled steel plate has following performances：
Yield strength： 440Mpa；
Tensile strength： 565MPa；
Elongation percentage：28.5%；
The chemical composition of the 5th kind of constituent mass percentage is：
Balance of Fe and inevitable impurity；
The institutional framework of the hot rolled steel plate is ferrite or/and pearlite, and its grain size is 10.0~12.0；
Described hot rolled steel plate has following performances：
Yield strength： 435Mpa；
Tensile strength： 535MPa；
Elongation percentage：29.0%；
The chemical composition of the 6th kind of constituent mass percentage is：
Balance of Fe and inevitable impurity；
The institutional framework of the hot rolled steel plate is ferrite or/and pearlite, and its grain size is 10.0~12.0；
Described hot rolled steel plate has following performances：
Yield strength： 435Mpa；
Tensile strength： 555MPa；
Elongation percentage：30.0%；
The chemical composition of the 7th kind of constituent mass percentage is：
Balance of Fe and inevitable impurity；
The institutional framework of the hot rolled steel plate is ferrite or/and pearlite, and its grain size is 10.0~12.0；
Described hot rolled steel plate has following performances：
Yield strength： 430Mpa；
Tensile strength： 555MPa；
Elongation percentage：31.5%；
The chemical composition of the 8th kind of constituent mass percentage is：
Balance of Fe and inevitable impurity；
The institutional framework of the hot rolled steel plate is ferrite or/and pearlite, and its grain size is 10.0~12.0；
Described hot rolled steel plate has following performances：
Yield strength： 445Mpa；
Tensile strength： 540MPa；
Elongation percentage：30.5%；
The chemical composition of the 9th kind of constituent mass percentage is：
Balance of Fe and inevitable impurity；
The institutional framework of the hot rolled steel plate is ferrite or/and pearlite, and its grain size is 10.0~12.0；
Described hot rolled steel plate has following performances：
Yield strength： 440Mpa；
Tensile strength： 540MPa；
Elongation percentage：36.0%；
The chemical composition of the tenth kind of constituent mass percentage is：
Balance of Fe and inevitable impurity；
The institutional framework of the hot rolled steel plate is ferrite or/and pearlite, and its grain size is 10.0~12.0；
Described hot rolled steel plate has following performances：
Yield strength： 430Mpa；
Tensile strength： 530MPa；
Elongation percentage：31.5%.
2. the production method of inexpensive automotive frame hot rolled steel plate described in claim 1, it is characterised in that the producer
The step of method, is as follows：
Step A：Cast continuous casting billet
Iron is melted into molten iron, hot rolled steel plate molten iron is casting continuously to form continuous casting billet using continuous casting installation for casting；
Step B：Roughing is batched with Coil Box is sent；
The continuous casting billet that step A is obtained is heated to 1200~1260 DEG C of temperature using furnace apparatus, roughing mill is then used by and is set
It is standby to carry out roughing into intermediate slab；Then batched using mandrelless transform Coil Box, turn intermediate slab carries out finish rolling end to end；
Step C：Finish rolling with batch
Be then used by continuous hot rolling facility carries out finish rolling to the intermediate slab that the step B is obtained, in finish rolling by inlet temperature control
System is rolled at 980~1050 DEG C, and rolling temperature control is 850~920 DEG C；It is cold with 10~20 DEG C/s of rate of temperature fall after rolling
But to temperature 570~650 DEG C batch, finally obtain described inexpensive automotive frame hot rolled steel plate.
3. production method according to claim 2, it is characterised in that in step, the thickness of the continuous casting billet is 200~
230mm。
4. production method according to claim 2, it is characterised in that in stepb, the thickness of the intermediate slab is 32
~46mm.
5. production method according to claim 2, it is characterised in that in step C, the inexpensive automotive frame heat
The thickness of rolled steel plate is 3.0~10.0mm.
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| CN105463309B (en) * | 2015-12-01 | 2017-07-07 | 攀钢集团西昌钢钒有限公司 | A kind of production method for eliminating low carbon mild steel cross breaks defect |
| CN107881420A (en) * | 2016-09-29 | 2018-04-06 | 上海梅山钢铁股份有限公司 | A kind of tensile strength 550Mpa level hot rolled steel plates and its manufacture method |
| CN112030071A (en) * | 2020-08-19 | 2020-12-04 | 本钢板材股份有限公司 | 510 MPa-grade high-toughness automobile girder steel and preparation method thereof |
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| US5123969A (en) * | 1991-02-01 | 1992-06-23 | China Steel Corp. Ltd. | Bake-hardening cold-rolled steel sheet having dual-phase structure and process for manufacturing it |
| JP3358938B2 (en) * | 1996-06-10 | 2002-12-24 | 株式会社神戸製鋼所 | High-strength hot-rolled steel sheet with excellent chemical conversion and workability |
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Application publication date: 20150610 Assignee: PANGANG GROUP PANZHIHUA STEEL & VANADIUM Co.,Ltd. Assignor: PANGANG GROUP PANZHIHUA IRON & STEEL RESEARCH INSTITUTE Co.,Ltd. Contract record no.: X2024980004525 Denomination of invention: Hot rolled steel plates and production methods for low-cost automotive beams Granted publication date: 20170531 License type: Common License Record date: 20240417 |