CN107904502B - 610MPa grades of automotive frame hot rolled steel plates and its production method - Google Patents
610MPa grades of automotive frame hot rolled steel plates and its production method Download PDFInfo
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- CN107904502B CN107904502B CN201711181862.9A CN201711181862A CN107904502B CN 107904502 B CN107904502 B CN 107904502B CN 201711181862 A CN201711181862 A CN 201711181862A CN 107904502 B CN107904502 B CN 107904502B
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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
-
- 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
-
- 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
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
-
- 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
- C21D2211/009—Pearlite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention belongs to hot-rolling plate band production technical fields, more particularly to a kind of 610MPa grades of automotive frame hot rolled steel plate and its production method.Technical problem to be solved by the invention is to provide a kind of 610MPa grades of automotive frame hot rolled steel plates, by weight percentage, chemical component is C:0.05~0.10%, Si :≤0.15%, Mn:1.30~1.60%, P :≤0.020%, S :≤0.010%, Nb:0.010~0.040%, surplus are Fe and inevitable impurity.The method of the present invention, which produces tensile strength 610MPa grades of hot-rolled steel sheet for automobile, has the characteristics that low cost, intensity are high, yield tensile ratio is low, and rolling mill practice control is simple and adaptability is stronger.Gained finished product mechanical property of the invention reaches ReL >=500MPa, Rm:610~740MPa, the requirement of A >=21.0%.
Description
Technical field
The invention belongs to hot-rolling plate band production technical fields, more particularly to a kind of 600MPa grades of beam steel and its
Production method.
Background technique
Automobile frame is subject to the important component of load, it to bear the weight of automobile itself components, loading capacity and
When driving the effects of suffered impact, distortion, inertia force, to improve vehicle frame bearing capacity and ensuring the peace of vehicle heavy duty enforcement
Quan Xing, while automobile factory requires to meet downstream user to the heavy duty of vehicle, heavy and medium truck stringer mostly uses at present
Lengthening beam and " double crossbeams " structure-i.e. " main longitudinal grider+reinforcing beam " formula vehicle frame.In order to reduce car weight, each automaker is to height
The demand of strength automotive beam steel plate is continuously increased, and each iron and steel enterprise also goes with the tide of historical development, and it is big constantly to develop new automobile
Hot-rolled steel sheet.
It is high-strength that the production of domestic and international high-strength vehicle hot rolled steel plate reaches automotive sheet using kinds of processes route
The requirement of degree and high tenacity.Such as exploitation includes dual phase steel, Multiphase Steel, to reach the mesh such as armor plate strength is high, processability is excellent
Mark.As thin gauge high-elongation hot rolling acid-cleaning 610L automotive frame steel band production technology (patent No.:
CN201310234511.5), the chemical component of steel grade is not provided, it is also fairly simple to operation of rolling introduction, be as defined in emphasis
Acid cleaning process.Yield strength 500Mpa or more steel for automobile crossbeam and its manufacturing method (patent No.:
CN200810154866.2), chemical component are as follows: 0.065%~0.095%C, 0.03%~0.07%Si, 1.51%~
1.65%Mn, 0.010%~0.016%P, 0.003%~0.008%S, 0.051%~0.060%Nb, 0.051%~
0.065%V, Ti:0.015%~0.025%, 0.02%~0.05%Alt；Base charging temperature are as follows: 800 DEG C~1000 DEG C, out
Furnace temperature is 1200 DEG C~1230 DEG C, and heating time is 160Min~180Min；The control of roughing outlet temperature are as follows: 1025 DEG C~
1055 DEG C, the slab after roughing subsequently enters Coil Box, exchanges band steel toe, tail, and then slab carries out seven rack tandem rollings,
Entry temperature at finishing is 1015 DEG C~1045 DEG C, and exit temperature at finishing is 810 DEG C~840 DEG C；Coiling temperature is 540 DEG C~610
℃.A kind of 610MPa auto truck beam steel and its manufacturing method (200910251584.9), chemical component are as follows: C:0.08~
0.12；Si:0.10~0.30；Mn:1.40~1.60；P≤0.010；S≤0.005；Nb:0.040~0.060；V:0.020~
0.030；Ti:0.010~0.030, continuous casting billet are heated to 1200 DEG C~1250 DEG C；Temperature is 1000 DEG C~1050 DEG C after roughing,
Warm cover enters finishing mill and is rolled, and finishing temperature is 820 DEG C~880 DEG C, and the coil of strip after rolling is through the fast quickly cooling of section cooling
But to batching after 530 DEG C~580 DEG C.
Automotive frame hot rolled steel plate and production method (201510136930.4), chemical component are as follows: C:0.05%-
0.10%；Si:0.10%-0.35%；Mn:0.95%-1.40%；P :≤0.025%；S :≤0.015%；Ti:0.020%-
0.050%；1200~1260 DEG C of heating temperature, entry temperature at finishing control is rolled at 980~1050 DEG C, and finishing temperature is
850~920 DEG C；570~650 DEG C of temperature are cooled to after rolling with 10~20 DEG C/s of rate of temperature fall to batch.610MPa grades of automobiles are big
Beam steel and its manufacturing method (CN104988398A), chemical constituent are as follows: carbon: 0.07%~0.09%；Silicon < 0.10%；Manganese:
1.50%~1.65%；Phosphorus≤0.015%；Sulphur≤0.010%；Solid solution aluminium: 0.020%~0.070%；Niobium: 0.045~
0.065%；Titanium: 0.003~0.01%；Hot Strip Rolling heating temperature is 1200~1300 DEG C, and roughing outlet temperature is 1040
~1140 DEG C, finishing temperature is 800~860 DEG C, and coiling temperature is 550~590 DEG C, 35 DEG C of the water temperature < of cooling water, cooling speed
Spend≤25 DEG C/s.
It can be seen that 610MPa grades of domestic production tensile strength of automotive frame uses niobium, vanadium, titanium, manganese micro- substantially with hot rolled steel plate
Alloying route.
Summary of the invention
First technical problem to be solved by this invention is to provide a kind of 610MPa grades of automotive frame hot rolled steel plate.It should
610MPa grades of automotive frame hot rolled steel plates, by weight percentage, chemical component are C:0.05~0.10%, Si :≤
0.15%, Mn:1.30~1.60%, P :≤0.020%, S :≤0.010%, Nb:0.010~0.040%, surplus is for Fe and not
It can avoid impurity.
Second technical problem to be solved by this invention is to provide above-mentioned 610MPa grades of automotive frame hot rolled steel plate
Production method.The production method is the following steps are included: routinely desulfurizing iron, converter smelting, LF furnace Ca processing, continuous casting obtain steel
Base；By weight percentage, chemical component is C:0.05~0.10%, Si :≤0.15%, Mn:1.30~1.60%, P to steel billet:
≤ 0.020%, S :≤0.010%, Nb:0.010~0.040%, surplus are Fe and inevitable impurity；Heating steel billet, roughing,
Finish rolling, cooling are kept the temperature after batching；Wherein, the heating refers to steel billet in 1210~1240 DEG C of heating 150min or more；Finish rolling enters
Mouth temperature is 950~1020 DEG C, and finishing temperature is 830~870 DEG C；Coiling temperature is 590~640 DEG C；The cooling is with 20
~70 DEG C/s speed is cooled to 590~640 DEG C.
Preferably, in the production method of above-mentioned 610MPa grades of automotive frame hot rolled steel plate, the heating time be 150~
210min。
Preferably, in the production method of above-mentioned 610MPa grades of automotive frame hot rolled steel plate, it is described batch after the guarantor that keeps the temperature
The warm time is 10~26h, and holding temperature is coiling temperature.
Specifically, steel billet obtained by the continuous casting is thick in the production method of above-mentioned 610MPa grades of automotive frame hot rolled steel plate
Degree is 200~230mm.
Specifically, the roughing passage is 3~7 in the production method of above-mentioned 610MPa grades of automotive frame hot rolled steel plate
Passage.
Specifically, in the production method of above-mentioned 610MPa grades of automotive frame hot rolled steel plate, intermediate base obtained by the roughing
With a thickness of 30~60mm.
The method of the present invention, which produces tensile strength 610MPa grades of hot-rolled steel sheet for automobile, has low cost, intensity height, Qu Qiang
Than low feature, and rolling mill practice control is simple and adaptability is stronger.Gained finished product mechanical property of the invention reach ReL >=
500MPa, Rm:610~740MPa, the requirement of A >=21.0%.
Specific embodiment
The 610MPa grade automotive frame hot rolled steel plate that the present invention uses Nb-microalloying mode to obtain, mass percent
For C:0.05~0.10%, Si :≤0.15%, Mn:1.30~1.60%, P :≤0.020%, S :≤0.010%, Nb:0.010
~0.040%, surplus is Fe and inevitable impurity.
The present invention is using the suitable chemical finished product of control, then cooperates using high-temperature final rolling, rapid cooling, in perlitic transformation
Into the cooling controlling and rolling controlling process system of burial pit Slow cooling in temperature range, it is anti-successfully to produce ferrite+pearlitic structrure
Tensile strength 610MPa grade high-strength hot-rolled steel sheet for automobile there is low cost, rolling mill practice to control simple and adaptable etc.
Feature.Being quickly cooled down purpose is to obtain fine tissue, improve intensity, and in order to reach the purpose, need to control cooling condition is
20~70 DEG C/s speed is cooled to 590~640 DEG C.Meanwhile because have austenite to perlitic transformation process in coiling temperature, and
C diffusion is related, and holding time can increase the content of pearlite, so that yield tensile ratio be effectively reduced.It is preferred that 590 after batching
~640 DEG C of 10~26h of heat preservation.
The production method of 610MPa grades of automotive frame hot rolled steel plate of the present invention, comprising the following steps: by molten steel composition control
System is in C:0.05~0.10%, Si :≤0.15%, Mn:1.30~1.60%, P :≤0.020%, S :≤0.010%, Nb:
0.010~0.040%, surplus is Fe and inevitable impurity；Be casting continuously to form the continuous casting billet of 200~230mm, slab 1210~
1240 DEG C of soaking 150min or more carry out roughing using 3~7 passages, are rolled into the thick intermediate base of 30~60mm, then through 4~7 racks
Finish rolling is carried out, controls entry temperature at finishing at 950~1020 DEG C, finishing temperature is at 830~870 DEG C, with the cold of 20~70 DEG C/s
But speed is quickly cooled to 590~640 DEG C and batches, and batches and keeps the temperature laggard burial pit stacking progress Slow cooling acquisition finished product.
The heat preservation is in 590~640 DEG C of 10~26h of heat preservation.
Embodiment 1
Molten steel ingredient after making steel step are as follows: the C of 0.05 weight %, the Si of 0.11 weight %, the Mn of 1.42 weight %,
The P of 0.011 weight %, the S of 0.005 weight %, the Nb of 0.032 weight %, surplus are Fe and inevitable impurity, continuous casting plate
Base is with a thickness of 230mm, the then soaking in 1210 DEG C of heating furnace, the intermediate base after roughing with a thickness of 59mm, finish rolling
Start rolling temperature is 1020 DEG C, and finish rolling finishing temperature is 850 DEG C.After finish rolling steel plate with a thickness of 10.0mm, it is then cold through leading portion layer
620 DEG C are cooled to the cooling rate of 37 DEG C/s to be batched, in temperature 15h after batching, then into burial pit Slow cooling,
Slow cooling time 73 hours.Coil of strip yield strength (ReL), tensile strength (Rm), elongation percentage (A) and yield tensile ratio are shown in Table 1.
Embodiment 2
Molten steel ingredient after making steel step are as follows: the C of 0.08 weight %, the Si of 0.07 weight %, the Mn of 1.57 weight %,
The P of 0.016 weight %, the S of 0.006 weight %, the Nb of 0.019 weight %, surplus are Fe and inevitable impurity, continuous casting plate
Base is with a thickness of 200mm, the then soaking in 1230 DEG C of heating furnace, the intermediate base after roughing with a thickness of 45mm, finish rolling
Start rolling temperature is 950 DEG C, and finish rolling finishing temperature is 830 DEG C.After finish rolling steel plate with a thickness of 3.0mm, then through leading portion layer it is cold with
The cooling rate of 68 DEG C/s is cooled to 590 DEG C and is batched, and in temperature 20h after batching, then into burial pit Slow cooling, delays
Cool time 65 hours.Coil of strip yield strength (ReL), tensile strength (Rm), elongation percentage (A) and yield tensile ratio are shown in Table 1.
Embodiment 3
Molten steel ingredient after making steel step are as follows: the C of 0.10 weight %, the Si of 0.06 weight %, the Mn of 1.36 weight %,
The P of 0.020 weight %, the S of 0.010 weight %, the Nb of 0.027 weight %, surplus are Fe and inevitable impurity, continuous casting plate
Base is with a thickness of 220mm, the then soaking in 1240 DEG C of heating furnace, the intermediate base after roughing with a thickness of 36mm, finish rolling
Start rolling temperature is 1000 DEG C, and finish rolling finishing temperature is 870 DEG C.After finish rolling steel plate with a thickness of 6.0mm, then through leading portion layer it is cold with
The cooling rate of 52 DEG C/s is cooled to 610 DEG C and is batched, and in temperature 25h after batching, then into burial pit Slow cooling, delays
Cool time 78 hours.Coil of strip yield strength (ReL), tensile strength (Rm), elongation percentage (A) and yield tensile ratio are shown in Table 1.
Embodiment 4
Molten steel ingredient after making steel step are as follows: the C of 0.07 weight %, the Si of 0.13 weight %, the Mn of 1.46 weight %,
The P of 0.012 weight %, the S of 0.007 weight %, the Nb of 0.038 weight %, surplus are Fe and inevitable impurity, continuous casting plate
Base is with a thickness of 230mm, the then soaking in 1230 DEG C of heating furnace, the intermediate base after roughing with a thickness of 59mm, finish rolling
Start rolling temperature is 950 DEG C, and finish rolling finishing temperature is 840 DEG C.After finish rolling steel plate with a thickness of 16.0mm, then through leading portion layer it is cold with
The cooling rate of 24 DEG C/s is cooled to 630 DEG C and is batched, and in temperature 12h after batching, then into burial pit Slow cooling, delays
Cool time 96 hours.Coil of strip yield strength (ReL), tensile strength (Rm), elongation percentage (A) and yield tensile ratio are shown in Table 1.
Performance index measurement is carried out with hot-rolled steel plates and sheets using GB/T 3273-2015 automotive frame.
Table 1
| Embodiment | ReL(MPa) | m(MPa) | A (%) | Yield tensile ratio |
| 1 | 528 | 636 | 25.5 | 0.83 |
| 2 | 561 | 652 | 28.0 | 0.86 |
| 3 | 536 | 631 | 26.5 | 0.85 |
| 4 | 512 | 618 | 24.0 | 0.83 |
Claims (6)
1.610MPa grades of automotive frame hot rolled steel plates, it is characterised in that: by weight percentage, chemical component be C:0.05~
0.10%, Si :≤0.15%, Mn:1.30~1.60%, P :≤0.020%, S :≤0.010%, Nb:0.010~0.040%,
Surplus is Fe and inevitable impurity；
The steel plate is prepared by following methods: routinely desulfurizing iron, converter smelting, LF furnace Ca processing, continuous casting obtain
Steel billet；Heating steel billet, roughing, finish rolling, cooling, batch after keep the temperature；Wherein, heating temperature is 1210~1240 DEG C；Finish rolling entrance
Temperature is 950~1020 DEG C, and finishing temperature is 830~870 DEG C；Coiling temperature is 590~640 DEG C；The cooling be with 20~
70 DEG C/s speed is cooled to 590~640 DEG C；It is described batch after the soaking time that keeps the temperature be 10~26h, holding temperature is to batch
Temperature.
2. a kind of production method for 610MPa grades of automotive frame hot rolled steel plate described in claim 1, it is characterised in that:
The following steps are included: routinely desulfurizing iron, converter smelting, LF furnace Ca processing, continuous casting obtain steel billet；Steel billet is by weight percentage
Meter, chemical component are C:0.05~0.10%, Si :≤0.15%, Mn:1.30~1.60%, P :≤0.020%, S :≤
0.010%, Nb:0.010~0.040%, surplus are Fe and inevitable impurity；Heating steel billet, finish rolling, cooling, batches at roughing
After keep the temperature；Wherein, heating temperature is 1210~1240 DEG C；Entry temperature at finishing be 950~1020 DEG C, finishing temperature be 830~
870℃；Coiling temperature is 590~640 DEG C；The cooling is to be cooled to 590~640 DEG C with 20~70 DEG C/s speed；The volume
The soaking time kept the temperature after taking is 10~26h, and holding temperature is coiling temperature.
3. the production method of 610MPa grades of automotive frame hot rolled steel plate according to claim 2, it is characterised in that: described
Heating time is 150~210min.
4. the production method of 610MPa grades of automotive frame hot rolled steel plate according to claim 2 or 3, it is characterised in that:
Steel billet obtained by the continuous casting is with a thickness of 200~230mm.
5. the production method of 610MPa grades of automotive frame hot rolled steel plate according to claim 2 or 3, it is characterised in that:
The roughing passage is 3~7 passages.
6. the production method of 610MPa grades of automotive frame hot rolled steel plate according to claim 2 or 3, it is characterised in that:
Workpiece thickness obtained by the roughing is 30~60mm.
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| CN109023111B (en) * | 2018-09-26 | 2020-04-07 | 武汉钢铁有限公司 | 1000 MPa-grade hot-rolled automobile girder steel and manufacturing method thereof |
| CN110899331B (en) * | 2019-12-05 | 2022-03-01 | 马鞍山钢铁股份有限公司 | Control method of iron oxide powder on surface of hot rolled plate |
| CN113549843A (en) * | 2021-07-29 | 2021-10-26 | 重庆钢铁股份有限公司 | 610L automobile beam steel belt and manufacturing and application thereof |
| CN116145031A (en) * | 2022-12-27 | 2023-05-23 | 舞阳钢铁有限责任公司 | Low-carbon high-toughness 16MnDR steel plate and production method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014487A (en) * | 2011-09-20 | 2013-04-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolling steel plate for automobile girder, and production method thereof |
| CN104073716A (en) * | 2013-08-07 | 2014-10-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolled steel plate for automotive frame and production method of hot rolled steel plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014487A (en) * | 2011-09-20 | 2013-04-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolling steel plate for automobile girder, and production method thereof |
| CN104073716A (en) * | 2013-08-07 | 2014-10-01 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolled steel plate for automotive frame and production method of hot rolled steel plate |
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