CN104694824A - Low-cost automobile girder hot rolled steel plate and production method - Google Patents
Low-cost automobile girder hot rolled steel plate and production method Download PDFInfo
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- CN104694824A CN104694824A CN201510138037.5A CN201510138037A CN104694824A CN 104694824 A CN104694824 A CN 104694824A CN 201510138037 A CN201510138037 A CN 201510138037A CN 104694824 A CN104694824 A CN 104694824A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 121
- 239000010959 steel Substances 0.000 title claims abstract description 121
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 55
- 238000005096 rolling process Methods 0.000 claims abstract description 79
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims description 21
- 239000000126 substance Substances 0.000 claims description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 18
- 238000005098 hot rolling Methods 0.000 claims description 14
- 239000012535 impurity Substances 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims description 3
- 238000009749 continuous casting Methods 0.000 claims description 3
- 235000019362 perlite Nutrition 0.000 claims description 3
- 239000010451 perlite Substances 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims 1
- 238000009434 installation Methods 0.000 claims 1
- 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
- 238000005516 engineering process Methods 0.000 abstract description 6
- 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
- 238000000034 method Methods 0.000 description 20
- 239000010955 niobium Substances 0.000 description 8
- 238000005275 alloying Methods 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
- 230000015572 biosynthetic process 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
- 238000001816 cooling Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- RJSRQTFBFAJJIL-UHFFFAOYSA-N niobium titanium Chemical group [Ti].[Nb] RJSRQTFBFAJJIL-UHFFFAOYSA-N 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Abstract
The invention discloses a low-cost automobile girder hot rolled steel plate and a production method. The hot rolled steel plate comprises, by weight, 0.05 %-0.10 % of C, 0.10 %-0.35 % of Si, 0.70 %-0.95 % of Mn, 0-0.025 % or 0.025 % of P, 0-0.015 % or 0.015 % S, and 0.020 %-0.050 % of Ti. A titanium and manganese microalloying mode is adopted, V, Nb and other noble elements are prevented from being added, the high-strength and low-cost automobile girder hot rolled steel plate with a ferrite and pearlitic structure is produced, the yield strength of the hot rolled steel plate is 355 MPa or more, the tensile strength ranges from 510 MPa to 620 MPa, the ductility is 24 % or more, and the hot rolled steel plate has the advantages that the mechanical property is stable, toughness matching is good, and the forming performance is superior. The steel grade alloy cost is low, the rolling technology is easy to control, adaptability is high, and good application and popularization prospects are achieved.
Description
Technical field
The present invention relates to hot continuous rolling strip production technical field, particularly relate to a kind of low cost automotive frame hot-rolled steel sheet and production method.
Background technology
Steel for automobile crossbeam is mainly used in the major part of the vehicle frame of impact briquetting automobile, as longeron, crossbeam and web member etc., and vehicle frame not only needs the weight of bearing automobile component, weight-carrying capacity, and need to bear the effect that will be subject to the complex stresses such as various impact, torsion in vehicle traveling process, working conditions is very harsh, and therefore steel for automobile crossbeam not only requires to have higher intensity, also needs to have good plasticity, toughness, anti-fatigue performance and processability etc.
Domestic and international steel for automobile crossbeam adopts multiple technologies route to reach the technical requirements of steel for automobile crossbeam, as developed dual phase steel, Multiphase Steel etc., but these technological line production costs are high, very high to the tooling Capability Requirement of hot continuous rolling, therefore, the steel for automobile crossbeam of yield strength intensity 355MPa still adopts the technological line of micro-alloyed steel to produce.
Patent ZL200710048767.1, name is called patent hot-rolled steel sheet for automobile and production method thereof, and its main chemical compositions is: 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 No. 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 the low-niobium strengthened production process (patent publication No. 101892421A) of beam 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 for containing vanadium hot-rolled steel sheet for automobile surface iron scale control method (patent publication No. 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 a kind of steel for automobile crossbeam and temperature control method (patent publication No. CN101698926A) thereof, 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 a kind of low-cost steel for automobile beam and manufacture method (patent publication No. CN102212747A) thereof, 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%.All containing noble metal Nb or V in the steel for automobile crossbeam of foregoing invention, its cost of alloy is higher.Patent name is a kind of 510MPa level automotive frame hot continuous rolling Strip and production technique (patent publication No. CN103451535A) thereof, 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 add cheap a small amount of Ti, do not add other expensive alloying elements any, reduce production cost, but its C content is high, in actual production, easy formation banded structure, cause steel plate plasticity poor, cold-bending property and welding property poor, easily ftracture in moulding process.
Summary of the invention
For the weak point that prior art exists, the object of the present invention is to provide a kind of low cost automotive frame hot-rolled steel sheet and production method, have employed V, Nb microalloying mode, its more than hot-rolled steel sheet yield strength 355MPa, tensile strength 510-620MPa, unit elongation more than 24%, has stable mechanical property, and obdurability mates feature that is good and processability excellence.
Object of the present invention is achieved through the following technical solutions:
A kind of low cost automotive frame hot-rolled steel sheet, described hot-rolled steel sheet has the chemical composition of following mass percent:
Surplus is Fe and inevitable impurity;
The weave construction of described hot-rolled steel sheet be ferrite or/and perlite, its grain fineness number is 10.0 ~ 12.0.
Preferred hot-rolled steel sheet chemical composition is further: described hot-rolled steel sheet has the chemical composition of following mass percent:
Surplus is Fe and inevitable impurity;
The invention provides a kind of preferred hot-rolled steel sheet chemical composition as follows: described hot-rolled steel sheet has the chemical composition of following mass percent:
Surplus is Fe and inevitable impurity;
As preferably, described hot-rolled steel sheet has following performance:
Yield strength: >=500Mpa;
Tensile strength: 610 ~ 720MPa;
Unit elongation: >=22%;
A production method for low cost automotive frame hot-rolled steel sheet, the step of described production method is as follows:
Steps A: cast continuously cast bloom
Iron is melted into molten iron, uses continuous casting installation for casting that the molten iron continuous casting containing following chemical composition mass percent is become continuously cast bloom:
Surplus is Fe and inevitable impurity;
Step B: roughing with send Coil Box to batch;
The continuously cast bloom using furnace apparatus steps A to be obtained is heated to temperature 1200 ~ 1260 DEG C, then uses roughing mill equipment to carry out roughing and becomes intermediate slab; Then adopt mandrelless transform Coil Box to batch, turn intermediate slab and carry out finish rolling end to end;
Step C: finish rolling with batch
Then use continous hot rolling facility to carry out finish rolling to the intermediate slab that described step B obtains, temperature in controlled when finish rolling to be rolled at 980 ~ 1050 DEG C, rolling temperature control is 850 ~ 920 DEG C; Be cooled to temperature 570 ~ 650 DEG C with rate of temperature fall 10 ~ 20 DEG C/s after rolling to batch, finally obtain described low cost automotive frame hot-rolled steel sheet.
The low cost automotive frame hot-rolled steel sheet obtained by aforementioned production method has following performance:
Yield strength: >=355Mpa;
Tensile strength: 510 ~ 620MPa;
Unit elongation: >=24%.
As preferably, the thickness of described continuously cast bloom is 200 ~ 230mm.
As preferably, the thickness of described intermediate slab is 32 ~ 46mm.
As preferably, the thickness of described low cost automotive frame hot-rolled steel sheet is 3.0 ~ 10.0mm.
The present invention comparatively prior art compares, and has the following advantages and beneficial effect:
The present invention adopts titanium, manganese microalloying mode, avoid noble elements such as adding V, Nb, produce the high-strength and low-cost automotive frame hot-rolled steel sheet of ferrite and pearlite tissue, its more than yield strength 355MPa, tensile strength 510-620MPa, unit elongation more than 24%, has stable mechanical property, and obdurability mates feature that is good and processability excellence.Steel grade cost of alloy of the present invention is low, rolling technology controls simple and adaptability is comparatively strong, has good popularizing application prospect.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail:
A kind of low cost automotive frame hot-rolled steel sheet, described hot-rolled steel sheet has the chemical composition of following mass percent:
Surplus is Fe and inevitable impurity;
The weave construction of described hot-rolled steel sheet be ferrite or/and perlite, its grain fineness number is 10.0 ~ 12.0.
Described hot-rolled steel sheet has the chemical composition of following mass percent:
Surplus is Fe and inevitable impurity;
Described hot-rolled steel sheet has the chemical composition of following mass percent:
Surplus is Fe and inevitable impurity;
Described hot-rolled steel sheet has following performance:
Yield strength: >=355Mpa;
Tensile strength: 510 ~ 620MPa;
Unit elongation: >=24%;
A production method for low cost automotive frame hot-rolled steel sheet, the invention provides following 10 embodiments, is described in further detail the present invention.
The production method flow process of this low cost automotive frame hot-rolled steel sheet is as follows: steps A: cast continuously cast bloom → step B: roughing with send Coil Box to batch → step C: finish rolling with batch;
According to aforementioned production method flow process, in a specific embodiment, the present invention's preferred concrete grammar flow process is as follows: after the concise slag desulfurization → stove of desulfurizing iron → converter smelting top-bottom blowing → deoxidation, alloying and high alkalinity, chain-wales is mended and fed Al line, Ti microalloying → feed calcium line → continuous casting → heating of plate blank → high-pressure water descaling → roughing → Coil Box to batch → finish rolling → section cooling → batch → pack warehouse-in.
Embodiment 1
A production method for low cost automotive frame hot-rolled steel sheet, the step of described production method is as follows:
Steps A: cast continuously cast bloom
Iron is melted into molten iron, uses continuous casting installation for casting equipment that the molten iron continuous casting containing following chemical composition mass percent is become continuously cast bloom:
Surplus is Fe and inevitable impurity;
Step B: roughing with send Coil Box to batch;
The continuously cast bloom using furnace apparatus steps A to be obtained is heated to temperature 1235 DEG C, and then use _ _ _ roughing mill equipment carries out roughing and becomes intermediate slab; Then adopt mandrelless transform Coil Box to batch, turn intermediate slab and carry out finish rolling end to end;
Step C: finish rolling with batch
Then use continous hot rolling facility to carry out finish rolling to the intermediate slab that described step B obtains, temperature in controlled when finish rolling to be rolled at 1008 DEG C, rolling temperature control is 872 DEG C; Be cooled to temperature 605 DEG C with rate of temperature fall 10 DEG C/s after rolling to batch, finally obtain described low cost automotive frame hot-rolled steel sheet;
The thickness of described continuously cast bloom is 200mm.
The thickness of described intermediate slab is 32mm.
The thickness of described low cost automotive frame hot-rolled steel sheet is 8.0mm.
The mechanical property of the hot-rolled steel sheet coil of strip obtained according to embodiment 1 production method is as follows: yield strength (ReL): 445MPa, tensile strength (Rm): 550MPa, unit elongation (A) 27.5%, clod wash B=35, α=180 °, d=0: qualified.Above-mentioned indices all reaches the predetermined mechanical property of hot-rolled steel sheet, namely utilizes the method for embodiment 1 to reach the mechanical performance index of hot-rolled steel sheet of the present invention.
Embodiment 2
A production method for low cost automotive frame hot-rolled steel sheet, the step of described production method is as follows:
Steps A: cast continuously cast bloom
Iron is melted into molten iron, uses continuous casting installation for casting that the molten iron continuous casting containing following chemical composition mass percent is become continuously cast bloom:
Surplus is Fe and inevitable impurity;
Step B: roughing with send Coil Box to batch;
The continuously cast bloom using furnace apparatus steps A to be obtained is heated to temperature 1245 DEG C, then uses roughing mill equipment to carry out roughing and becomes intermediate slab; Then adopt mandrelless transform Coil Box to batch, turn intermediate slab and carry out finish rolling end to end;
Step C: finish rolling with batch
Then use continous hot rolling facility to carry out finish rolling to the intermediate slab that described step B obtains, temperature in controlled when finish rolling to be rolled at 995 DEG C, rolling temperature control is 893 DEG C; Be cooled to temperature 590 DEG C with rate of temperature fall 12 DEG C/s after rolling to batch, finally obtain described low cost automotive frame hot-rolled steel sheet.
As preferably, the thickness of described continuously cast bloom is 230mm.
As preferably, the thickness of described intermediate slab is 34mm.
As preferably, the thickness of described low cost automotive frame hot-rolled steel sheet is 9.8mm.
The mechanical property of the hot-rolled steel sheet coil of strip obtained according to embodiment 2 production method is as follows: yield strength (ReL): 430MPa, tensile strength (Rm): 540MPa, unit elongation (A) 30.0%, clod wash B=35, α=180 °, d=0: qualified.Above-mentioned indices all reaches the predetermined mechanical property of hot-rolled steel sheet, namely utilizes the method for embodiment 2 to reach the mechanical performance index of hot-rolled steel sheet of the present invention.
Embodiment 3
A production method for low cost automotive frame hot-rolled steel sheet, the step of described production method is as follows:
Steps A: cast continuously cast bloom
Iron is melted into molten iron, uses continuous casting installation for casting that the molten iron continuous casting containing following chemical composition mass percent is become continuously cast bloom:
Surplus is Fe and inevitable impurity;
Step B: roughing with send Coil Box to batch;
The continuously cast bloom using furnace apparatus steps A to be obtained is heated to temperature 1238 DEG C, then uses roughing mill equipment to carry out roughing and becomes intermediate slab; Then adopt mandrelless transform Coil Box to batch, turn intermediate slab and carry out finish rolling end to end;
Step C: finish rolling with batch
Then use continous hot rolling facility to carry out finish rolling to the intermediate slab that described step B obtains, temperature in controlled when finish rolling to be rolled at 1007 DEG C, rolling temperature control is 885 DEG C; Be cooled to temperature 633 DEG C with rate of temperature fall 14 DEG C/s after rolling to batch, finally obtain described low cost automotive frame hot-rolled steel sheet.
As preferably, in step, the thickness of described continuously cast bloom is 210mm.
As preferably, in stepb, the thickness of described intermediate slab is 34mm.
As preferably, in step C, the thickness of described low cost automotive frame hot-rolled steel sheet is 5.5mm.
The mechanical property of the hot-rolled steel sheet coil of strip obtained according to embodiment 3 production method is as follows: yield strength (ReL): 450MPa, tensile strength (Rm): 570MPa, unit elongation (A) 27.0%, clod wash B=35, α=180 °, d=0: qualified.Above-mentioned indices all reaches the predetermined mechanical property of hot-rolled steel sheet, namely utilizes the method for embodiment 3 to reach the mechanical performance index of hot-rolled steel sheet of the present invention.
Embodiment 4
A production method for low cost automotive frame hot-rolled steel sheet, the step of described production method is as follows:
Steps A: cast continuously cast bloom
Iron is melted into molten iron, uses continuous casting installation for casting that the molten iron continuous casting containing following chemical composition mass percent is become continuously cast bloom:
Surplus is Fe and inevitable impurity;
Step B: roughing with send Coil Box to batch;
The continuously cast bloom using furnace apparatus steps A to be obtained is heated to temperature 1223 DEG C, then uses roughing mill equipment to carry out roughing and becomes intermediate slab; Then adopt mandrelless transform Coil Box to batch, turn intermediate slab and carry out finish rolling end to end;
Step C: finish rolling with batch
Then use continous hot rolling facility to carry out finish rolling to the intermediate slab that described step B obtains, temperature in controlled when finish rolling to be rolled at 1025 DEG C, rolling temperature control is 892 DEG C; Be cooled to temperature 625 DEG C with rate of temperature fall 14 DEG C/s after rolling to batch, finally obtain described low cost automotive frame hot-rolled steel sheet.
As preferably, in step, the thickness of described continuously cast bloom is 210mm.
As preferably, in stepb, the thickness of described intermediate slab is 34mm.
As preferably, in step C, the thickness of described low cost automotive frame hot-rolled steel sheet is 6.0mm.
The mechanical property of the hot-rolled steel sheet coil of strip obtained according to embodiment 4 production method is as follows: yield strength (ReL): 440MPa, tensile strength (Rm): 565MPa, unit elongation (A) 28.5%, clod wash B=35, α=180 °, d=0: qualified.Above-mentioned indices all reaches the predetermined mechanical property of hot-rolled steel sheet, namely utilizes the method for embodiment 4 to reach the mechanical performance index of hot-rolled steel sheet of the present invention.
Embodiment 5
A production method for low cost automotive frame hot-rolled steel sheet, the step of described production method is as follows:
Steps A: cast continuously cast bloom
Iron is melted into molten iron, uses continuous casting installation for casting that the molten iron continuous casting containing following chemical composition mass percent is become continuously cast bloom:
Surplus is Fe and inevitable impurity;
Step B: roughing with send Coil Box to batch;
The continuously cast bloom using furnace apparatus steps A to be obtained is heated to temperature 1238 DEG C, then uses roughing mill equipment to carry out roughing and becomes intermediate slab; Then adopt mandrelless transform Coil Box to batch, turn intermediate slab and carry out finish rolling end to end;
Step C: finish rolling with batch
Then use continous hot rolling facility to carry out finish rolling to the intermediate slab that described step B obtains, temperature in controlled when finish rolling to be rolled at 998 DEG C, rolling temperature control is 878 DEG C; Be cooled to temperature 623 DEG C with rate of temperature fall 16 DEG C/s after rolling to batch, finally obtain described low cost automotive frame hot-rolled steel sheet.
As preferably, in step, the thickness of described continuously cast bloom is 215mm.
As preferably, in stepb, the thickness of described intermediate slab is 35mm.
As preferably, in step C, the thickness of described low cost automotive frame hot-rolled steel sheet is 6.5mm.
The mechanical property of the hot-rolled steel sheet coil of strip obtained according to embodiment 5 production method is as follows: yield strength (ReL): 435MPa, tensile strength (Rm): 535MPa, unit elongation (A) 29.0%, clod wash B=35, α=180 °, d=0: qualified.Above-mentioned indices all reaches the predetermined mechanical property of hot-rolled steel sheet, namely utilizes the method for embodiment 5 to reach the mechanical performance index of hot-rolled steel sheet of the present invention.
Embodiment 6
A production method for low cost automotive frame hot-rolled steel sheet, the step of described production method is as follows:
Steps A: cast continuously cast bloom
Iron is melted into molten iron, uses continuous casting installation for casting that the molten iron continuous casting containing following chemical composition mass percent is become continuously cast bloom:
Surplus is Fe and inevitable impurity;
Step B: roughing with send Coil Box to batch;
The continuously cast bloom using furnace apparatus steps A to be obtained is heated to temperature 1240 DEG C, then uses roughing mill equipment to carry out roughing and becomes intermediate slab; Then adopt mandrelless transform Coil Box to batch, turn intermediate slab and carry out finish rolling end to end;
Step C: finish rolling with batch
Then use continous hot rolling facility to carry out finish rolling to the intermediate slab that described step B obtains, temperature in controlled when finish rolling to be rolled at 1007 DEG C, rolling temperature control is 878 DEG C; Be cooled to temperature 635 DEG C with rate of temperature fall 15 DEG C/s after rolling to batch, finally obtain described low cost automotive frame hot-rolled steel sheet.
As preferably, in step, the thickness of described continuously cast bloom is 200mm.
As preferably, in stepb, the thickness of described intermediate slab is 30mm.
As preferably, in step C, the thickness of described low cost automotive frame hot-rolled steel sheet is 6.5mm.
The mechanical property of the hot-rolled steel sheet coil of strip obtained according to embodiment 6 production method is as follows: yield strength (ReL): 435MPa, tensile strength (Rm): 555MPa, unit elongation (A) 30.0%, clod wash B=35, α=180 °, d=0: qualified.Above-mentioned indices all reaches the predetermined mechanical property of hot-rolled steel sheet, namely utilizes the method for embodiment 6 to reach the mechanical performance index of hot-rolled steel sheet of the present invention.
Embodiment 7
A production method for low cost automotive frame hot-rolled steel sheet, the step of described production method is as follows:
Steps A: cast continuously cast bloom
Iron is melted into molten iron, uses continuous casting installation for casting that the molten iron continuous casting containing following chemical composition mass percent is become continuously cast bloom:
Surplus is Fe and inevitable impurity;
Step B: roughing with send Coil Box to batch;
The continuously cast bloom using furnace apparatus steps A to be obtained is heated to temperature 1244 DEG C, then uses roughing mill equipment to carry out roughing and becomes intermediate slab; Then adopt mandrelless transform Coil Box to batch, turn intermediate slab and carry out finish rolling end to end;
Step C: finish rolling with batch
Then use continous hot rolling facility to carry out finish rolling to the intermediate slab that described step B obtains, temperature in controlled when finish rolling to be rolled at 998 DEG C, rolling temperature control is 886 DEG C; Be cooled to temperature 602 DEG C with rate of temperature fall 18 DEG C/s after rolling to batch, finally obtain described low cost automotive frame hot-rolled steel sheet.
As preferably, in step, the thickness of described continuously cast bloom is 220mm.
As preferably, in stepb, the thickness of described intermediate slab is 40mm.
As preferably, in step C, the thickness of described low cost automotive frame hot-rolled steel sheet is 8.0mm.
The mechanical property of the hot-rolled steel sheet coil of strip obtained according to embodiment 7 production method is as follows: yield strength (ReL): 430MPa, tensile strength (Rm): 555MPa, unit elongation (A) 31.5%, clod wash B=35, α=180 °, d=0: qualified.Above-mentioned indices all reaches the predetermined mechanical property of hot-rolled steel sheet, namely utilizes the method for embodiment 7 to reach the mechanical performance index of hot-rolled steel sheet of the present invention.
Embodiment 8
A production method for low cost automotive frame hot-rolled steel sheet, the step of described production method is as follows:
Steps A: cast continuously cast bloom
Iron is melted into molten iron, uses continuous casting installation for casting that the molten iron continuous casting containing following chemical composition mass percent is become continuously cast bloom:
Surplus is Fe and inevitable impurity;
Step B: roughing with send Coil Box to batch;
The continuously cast bloom using furnace apparatus steps A to be obtained is heated to temperature 1237 DEG C, then uses roughing mill equipment to carry out roughing and becomes intermediate slab; Then adopt mandrelless transform Coil Box to batch, turn intermediate slab and carry out finish rolling end to end;
Step C: finish rolling with batch
Then use continous hot rolling facility to carry out finish rolling to the intermediate slab that described step B obtains, temperature in controlled when finish rolling to be rolled at 1023 DEG C, rolling temperature control is 893 DEG C; Be cooled to temperature 616 DEG C with rate of temperature fall 20 DEG C/s after rolling to batch, finally obtain described low cost automotive frame hot-rolled steel sheet.
As preferably, in step, the thickness of described continuously cast bloom is 220mm.
As preferably, in stepb, the thickness of described intermediate slab is 42mm.
As preferably, in step C, the thickness of described low cost automotive frame hot-rolled steel sheet is 5.0mm.
The mechanical property of the hot-rolled steel sheet coil of strip obtained according to embodiment 8 production method is as follows: yield strength (ReL): 445MPa, tensile strength (Rm): 540MPa, unit elongation (A) 30.5%, clod wash B=35, α=180 °, d=0: qualified.Above-mentioned indices all reaches the predetermined mechanical property of hot-rolled steel sheet, namely utilizes the method for embodiment 8 to reach the mechanical performance index of hot-rolled steel sheet of the present invention.
Embodiment 9
A production method for low cost automotive frame hot-rolled steel sheet, the step of described production method is as follows:
Steps A: cast continuously cast bloom
Iron is melted into molten iron, uses continuous casting installation for casting that the molten iron continuous casting containing following chemical composition mass percent is become continuously cast bloom:
Surplus is Fe and inevitable impurity;
Step B: roughing with send Coil Box to batch;
The continuously cast bloom using furnace apparatus steps A to be obtained is heated to temperature 1248 DEG C, then uses roughing mill equipment to carry out roughing and becomes intermediate slab; Then adopt mandrelless transform Coil Box to batch, turn intermediate slab and carry out finish rolling end to end;
Step C: finish rolling with batch
Then use continous hot rolling facility to carry out finish rolling to the intermediate slab that described step B obtains, temperature in controlled when finish rolling to be rolled at 997 DEG C, rolling temperature control is 897 DEG C; Be cooled to temperature 625 DEG C with rate of temperature fall 19 DEG C/s after rolling to batch, finally obtain described low cost automotive frame hot-rolled steel sheet.
As preferably, in step, the thickness of described continuously cast bloom is 210mm.
As preferably, in stepb, the thickness of described intermediate slab is 44mm.
As preferably, in step C, the thickness of described low cost automotive frame hot-rolled steel sheet is 7.0mm.
The mechanical property of the hot-rolled steel sheet coil of strip obtained according to embodiment 9 production method is as follows: yield strength (ReL): 440MPa, tensile strength (Rm): 540MPa, unit elongation (A) 36.0%, clod wash B=35, α=180 °, d=0: qualified.Above-mentioned indices all reaches the predetermined mechanical property of hot-rolled steel sheet, namely utilizes the method for embodiment 9 to reach the mechanical performance index of hot-rolled steel sheet of the present invention.
Embodiment 10
A production method for low cost automotive frame hot-rolled steel sheet, the step of described production method is as follows:
Steps A: cast continuously cast bloom
Iron is melted into molten iron, uses continuous casting installation for casting that the molten iron continuous casting containing following chemical composition mass percent is become continuously cast bloom:
Surplus is Fe and inevitable impurity;
Step B: roughing with send Coil Box to batch;
The continuously cast bloom using furnace apparatus steps A to be obtained is heated to temperature 1225 DEG C, then uses roughing mill equipment to carry out roughing and becomes intermediate slab; Then adopt mandrelless transform Coil Box to batch, turn intermediate slab and carry out finish rolling end to end;
Step C: finish rolling with batch
Then use continous hot rolling facility to carry out finish rolling to the intermediate slab that described step B obtains, temperature in controlled when finish rolling to be rolled at 1015 DEG C, rolling temperature control is 882 DEG C; Be cooled to temperature 613 DEG C with rate of temperature fall 20 DEG C/s after rolling to batch, finally obtain described low cost automotive frame hot-rolled steel sheet.
As preferably, in step, the thickness of described continuously cast bloom is 230mm.
As preferably, in stepb, the thickness of described intermediate slab is 46mm.
As preferably, in step C, the thickness of described low cost automotive frame hot-rolled steel sheet is 8.0mm.
The mechanical property of the hot-rolled steel sheet coil of strip obtained according to embodiment 7 production method is as follows: yield strength (ReL): 430MPa, tensile strength (Rm): 530MPa, unit elongation (A) 31.5%, clod wash B=35, α=180 °, d=0: qualified.Above-mentioned indices all reaches the predetermined mechanical property of hot-rolled steel sheet, namely utilizes the method for embodiment 7 to reach the mechanical performance index of hot-rolled steel sheet of the present invention.
Here is the machined parameters summary sheet of embodiment 1 ~ embodiment 10, and wherein table 1 is the chemical composition of 10 embodiments of the present invention, and table 2 is hot rolling technology controlling valus, the mechanical property of the hot-rolled steel sheet coil of strip that table 30 embodiments process respectively.
The chemical composition of table 1 embodiment
| 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 valu of table 2 embodiment
The mechanical property of the coil of strip of table 3 embodiment
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a low cost automotive frame hot-rolled steel sheet, is characterized in that described hot-rolled steel sheet has the chemical composition of following mass percent:
Surplus is Fe and inevitable impurity;
The weave construction of described hot-rolled steel sheet be ferrite or/and perlite, its grain fineness number is 10.0 ~ 12.0.
2. low cost automotive frame hot-rolled steel sheet according to claim 1, is characterized in that described hot-rolled steel sheet has the chemical composition of following mass percent:
3. low cost automotive frame hot-rolled steel sheet according to claim 2, is characterized in that described hot-rolled steel sheet has the chemical composition of following mass percent:
4. low cost automotive frame hot-rolled steel sheet according to claim 1, is characterized in that described hot-rolled steel sheet has following performance:
Yield strength: >=355Mpa;
Tensile strength: 510 ~ 620MPa;
Unit elongation: >=24%.
5. the production method of low cost automotive frame hot-rolled steel sheet described in claim any one of Claims 1 to 4, is characterized in that the step of described production method is as follows:
Steps A: cast continuously cast bloom
Iron is melted into molten iron, uses continuous casting installation for casting that the molten iron continuous casting containing following chemical composition mass percent is become continuously cast bloom:
Surplus is Fe and inevitable impurity;
Step B: roughing with send Coil Box to batch;
The continuously cast bloom using furnace apparatus steps A to be obtained is heated to temperature 1200 ~ 1260 DEG C, then uses roughing mill equipment to carry out roughing and becomes intermediate slab; Then adopt mandrelless transform Coil Box to batch, turn intermediate slab and carry out finish rolling end to end;
Step C: finish rolling with batch
Then use continous hot rolling facility to carry out finish rolling to the intermediate slab that described step B obtains, temperature in controlled when finish rolling to be rolled at 980 ~ 1050 DEG C, rolling temperature control is 850 ~ 920 DEG C; Be cooled to temperature 570 ~ 650 DEG C with rate of temperature fall 10 ~ 20 DEG C/s after rolling to batch, finally obtain described low cost automotive frame hot-rolled steel sheet.
6. production method according to claim 5, is characterized in that described low cost automotive frame hot-rolled steel sheet has following performance:
Yield strength: >=355Mpa;
Tensile strength: 510 ~ 620MPa;
Unit elongation: >=24%.
7. production method according to claim 5, is characterized in that in step, and the thickness of described continuously cast bloom is 200 ~ 230mm.
8. production method according to claim 5, is characterized in that in stepb, and the thickness of described intermediate slab is 32 ~ 46mm.
9. production method according to claim 5, is characterized in that in step C, and the thickness of described low cost automotive frame hot-rolled steel sheet is 3.0 ~ 10.0mm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105132805A (en) * | 2015-09-15 | 2015-12-09 | 攀钢集团攀枝花钢铁研究院有限公司 | Vanadium-containing steel for welding structure and preparation method of vanadium-containing steel for welding structure |
| CN105463309A (en) * | 2015-12-01 | 2016-04-06 | 攀钢集团西昌钢钒有限公司 | Production method for eliminating low-carbon soft steel cross-break 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 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6123743A (en) * | 1984-07-11 | 1986-02-01 | Kobe Steel Ltd | High-tension hot-rolled steel sheet for flat tubular parts for automobile |
| 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 |
| JPH101748A (en) * | 1996-06-10 | 1998-01-06 | Kobe Steel Ltd | High strength hot rolled steel plate excellent in chemical conversion treating property and workability |
| CN1450191A (en) * | 2002-03-22 | 2003-10-22 | 川崎制铁株式会社 | High-tensile strength hot-rolled steel sheet excellent in elongation properties and stretch flangeability and producing method thereof |
| CN102383035A (en) * | 2011-11-07 | 2012-03-21 | 武汉钢铁(集团)公司 | Steel for 10-ton axle shell and production method for steel |
-
2015
- 2015-03-26 CN CN201510138037.5A patent/CN104694824B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6123743A (en) * | 1984-07-11 | 1986-02-01 | Kobe Steel Ltd | High-tension hot-rolled steel sheet for flat tubular parts for automobile |
| 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 |
| JPH101748A (en) * | 1996-06-10 | 1998-01-06 | Kobe Steel Ltd | High strength hot rolled steel plate excellent in chemical conversion treating property and workability |
| CN1450191A (en) * | 2002-03-22 | 2003-10-22 | 川崎制铁株式会社 | High-tensile strength hot-rolled steel sheet excellent in elongation properties and stretch flangeability and producing method thereof |
| CN102383035A (en) * | 2011-11-07 | 2012-03-21 | 武汉钢铁(集团)公司 | Steel for 10-ton axle shell and production method for steel |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105132805A (en) * | 2015-09-15 | 2015-12-09 | 攀钢集团攀枝花钢铁研究院有限公司 | Vanadium-containing steel for welding structure and preparation method of vanadium-containing steel for welding structure |
| CN105132805B (en) * | 2015-09-15 | 2017-03-15 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of steel for welded structures containing vanadium and preparation method thereof |
| CN105463309A (en) * | 2015-12-01 | 2016-04-06 | 攀钢集团西昌钢钒有限公司 | Production method for eliminating low-carbon soft steel cross-break defect |
| 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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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 |