CN107502827A - Vehicle beam hot-rolled steel and its processing method - Google Patents
Vehicle beam hot-rolled steel and its processing method Download PDFInfo
- Publication number
- CN107502827A CN107502827A CN201710693928.6A CN201710693928A CN107502827A CN 107502827 A CN107502827 A CN 107502827A CN 201710693928 A CN201710693928 A CN 201710693928A CN 107502827 A CN107502827 A CN 107502827A
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- processing method
- rolled steel
- vehicle beam
- grain size
- steel
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Classifications
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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
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
Abstract
The invention discloses a kind of vehicle beam hot-rolled steel and its processing method, belongs to steel rolling process method and technology field.A kind of moderate crystal grain size is provided, mechanical performance can meet complex parts requirement, and the simple vehicle beam hot-rolled steel of production process and its processing method.The microscopic structure of the vehicle beam hot-rolled steel is isometric ferrite+pearlitic structrure, and its grain size is 10~12 grades, yield strength >=355MPa, 510~610MPa of tensile strength, elongation percentage more than 24%, 180 ° of cold bending test d=a are qualified, and its main component is in addition to iron and essential impurity, also need to control C, Mn, Si, Nb, Ti, S content.Described processing method is controlled using Mn, Nb micro-alloying technology, micro- Ti processing, and Si contents lowization, and isometric ferrite+pearlitic structrure of the alloying substance is realized by controlled rolling and controlled cooling, and ensures that its grain size is 10~12 grades.
Description
Technical field
The present invention relates to a kind of hot-rolled steel, more particularly, to a kind of vehicle beam hot-rolled steel, belongs to steel rolling process method
Technical field.The invention further relates to a kind of processing method for processing the vehicle beam hot-rolled steel.
Background technology
Car stand is subject to the important component of load, and it will bear weight, loading capacity and the row of automobile itself parts
Suffered impact, distortion, inertia force etc. act on when sailing.To improve suffered when vehicle frame carrying and can ensure and travel rush
Hit, distort the effect such as inertia force.For improve vehicle frame carrying can and ensure vehicle heavy duty exercise security, while automobile factory in order to
Meet that heavy duty of the downstream user to vehicle requires that the vehicle beam as manufacture vehicle frame is not only required higher with hot rolled steel plate
Intensity, also need good plasticity and toughness.The forming property of steel and its intensity and drawability closely related, in order to ensure that steel exist
Still there is well drawability under high intensity, and crystal grain thinning is to improve structure hardness of steel to improve drawability important means.
Final ferrite grain size is reduced, the number of dislocation motion obstacle will be increased, the length of increase intra-die product group, make surrender
Intensity increase, while improve the drawability of material.
Through retrieval, CN104805358A discloses a kind of tensile strength 550MPa level beam steels and preparation method thereof,
Add Ti micro alloying elements, saved cost of alloy, but due to Ti easily with the nonmetalloid such as the N in molten steel, 0, S
Field trash is formed, and Ti yield of alloy is unstable, because Ti microalloying beam steel tensile strength fluctuation ranges are larger, extends
Property is slightly worse, it is difficult to meets the requirement of vehicle beam complex partses.CN101168819 discloses a kind of hot-rolled steel containing vanadium
Plate and preparation method thereof, V micro alloying elements are added, ferritic content is 71%~89% in final tissue, pearlite
Content be 11%~29%, ferritic grain size be 5~16 μm.For manufacturing automobile longitudinal girder, have yield tensile ratio low
Feature, but because final tissue medium pearlite content is higher, crystallite dimension is larger, it is difficult to meets that vehicle beam is complicated zero
The requirement of part.
The content of the invention
The technical problems to be solved by the invention are：A kind of moderate crystal grain size is provided, mechanical performance can meet complexity zero
Part requirement, and the simple vehicle beam hot-rolled steel of production process, it is described for processing present invention also offers one kind
The processing method of vehicle beam hot-rolled steel.
Technical scheme is used by solve above-mentioned technical problem：A kind of vehicle beam hot-rolled steel, it is characterised in that：
Described vehicle beam is the alloying substance that includes following weight parts component with hot-rolled steel,
Described parts by weight of component includes C0.05%~0.12%, Mn1.0%~1.5%, Si0.01%~0.20%,
Nb0.020%~0.040%, Ti >=0.010%, S≤0.010%, remaining is Fe and inevitable impurity,
The microscopic structure of the alloying substance is isometric ferrite+pearlitic structrure, and its grain size is 10~12 grades, and surrender is strong
Degree >=355MPa, 510~610MPa of tensile strength, elongation percentage more than 24%, 180 ° of cold bending test d=a are qualified.
A kind of processing method for the vehicle beam hot-rolled steel, described processing method use Mn, Nb microalloy
Change technology, micro- Ti processing, and Si contents lowization are controlled, and the isometric ferrite of the alloying substance is realized by controlled rolling and controlled cooling
+ pearlitic structrure, and ensure that its grain size is 10~12 grades.
The beneficial effects of the invention are as follows：Vehicle beam provided by the invention is by system by above-mentioned component requirement with hot-rolled steel
Composition, and controlled using Mn, Nb micro-alloying technology, micro- Ti processing, and Si contents lowization, but also pass through controlled rolling and controlled cooling
Isometric ferrite+pearlitic structrure of the alloying substance is realized, and ensures that its grain size is 10~12 grades, thereby may be ensured that
Yield strength >=355MPa of herein described vehicle beam hot-rolled steel, 510~610MPa of tensile strength, elongation percentage 24% with
On, 180 ° of cold bending test d=a are qualified.So, not only guarantee constitutes the microcosmic crystalline substance of herein described vehicle beam hot-rolled steel
Grain is of moderate size, and can ensure its good mechanical performance.
It is further that in During Controlled Rolling, the heating and temperature control of slab is at 1200~1260 DEG C, the finish to gauge temperature of finish rolling
Degree control is at 840~900 DEG C, and oiler temperature control is at 620~680 DEG C.
It is further that in finishing stands, entry temperature at finishing≤1020 DEG C, finishing temperature scope is 840~900
℃。
Such scheme it is preferable that, control it is cold during, slab after finish rolling presses 10~30 DEG C/sec of section cooling
Speed is cooled to 620~680 DEG C of coiling temperature.
It is further the roughing of described production method also continuous casting and slab including molten steel.
Such scheme it is preferable that, in the casting process of molten steel, the thickness of the slab that continuous casting forms for 200~
250mm；In the rough rolling process of slab, roughing uses at least five passes, and the rolling reduction of each passage is necessary >=
20%, the finish to gauge thickness of roughing is 32~38mm.
It is further that described finishing pass is 5-7 passage.
Brief description of the drawings
Fig. 1~Fig. 4 is the microgram of several grainiesses of the present invention.
Embodiment
In order to solve the technical problem that existing vehicle beam hot-rolled steel can not meet complex partses requirement, the present invention carries
A kind of moderate crystal grain size supplied, mechanical performance can meet complex parts requirement, and the simple automobile of production process is horizontal
Beam hot-rolled steel, and the processing method for processing the vehicle beam hot-rolled steel.Described vehicle beam hot-rolled steel
To include the alloying substance of following weight parts component, described parts by weight of component includes C0.05%~0.12%, Mn1.0%
~1.5%, Si0.01%~0.20%, Nb0.020%~0.040%, Ti >=0.010%, S≤0.010%, remaining be Fe and
Inevitable impurity, the microscopic structure of the alloying substance is isometric ferrite+pearlitic structrure, and its grain size is 10~12
Level, yield strength >=355MPa, 510~610MPa of tensile strength, elongation percentage more than 24%, 180 ° of cold bending test d=a are qualified.
Described processing method passes through controlled rolling control using Mn, Nb micro-alloying technology, micro- Ti processing, and the control of Si contents lowization
It is cold to realize isometric ferrite+pearlitic structrure of the alloying substance, and ensure that its grain size is 10~12 grades.：The present invention carries
For vehicle beam hot-rolled steel be composition by above-mentioned component requirement by system, and using Mn, Nb micro-alloying technology, micro- Ti
Processing, and Si contents lowization are controlled, but also isometric ferrite+pearlite of the alloying substance is realized by controlled rolling and controlled cooling
Tissue, and ensure that its grain size is 10~12 grades, it thereby may be ensured that the surrender of herein described vehicle beam hot-rolled steel is strong
Degree >=355MPa, 510~610MPa of tensile strength, elongation percentage more than 24%, 180 ° of cold bending test d=a are qualified.So, not only
Guarantee constitutes being of moderate size for the microcosmic crystal grain of herein described vehicle beam hot-rolled steel, and can ensure its mechanicalness
Can be excellent.
In above-mentioned embodiment, in order to most ensure to obtain the automobile under above-mentioned mechanical performance and micro to greatest extent
Crossbeam hot-rolled steel, in addition to ensureing basic constituent content requirement, the control of each processing step is also highly important.For
This, the application has done specific regulation to each concerned process steps, i.e., in During Controlled Rolling, the heating and temperature control of slab 1200~
1260 DEG C, the finishing temperature control of finish rolling is at 840~900 DEG C, and oiler temperature control is at 620~680 DEG C；In finishing stands,
Entry temperature at finishing≤1020 DEG C, finishing temperature scope are 840~900 DEG C；Control it is cold during, slab after finish rolling by 10~
30 DEG C/sec of section cooling speed is cooled to 620~680 DEG C of coiling temperature.Meanwhile further, another mistake shifts crude green body onto
In technology controlling and process, i.e. the roughing of described production method also continuous casting and slab including molten steel；In the casting process of molten steel, even
The thickness for casting the slab formed is 200~250mm；In the rough rolling process of slab, roughing uses at least five passes, often
The rolling reduction of individual passage is necessary >=and 20%, the finish to gauge thickness of roughing is 32~38mm；Described finishing pass is 5-7 road
It is secondary.
In summary, there is following beneficial effect using the process next life car crossbeam hot-rolled steel that steams of the present invention
Fruit：
(1) crossbeam steel produced by the invention is used, by reducing Si contents, Nb alloys is added, gives full play to controlled rolling control
Cold energy power, to reach the requirement for improving forming property, there is the characteristics of technique is simple, and general hot continuous rolling can produce；
(2) forming property is improved according to the design of material thinking of technique-tissue-performance, application claims, control is organized as
Isometric columnar ferrite+pearlite, improves soft phase constitution --- and the ratio of isometric columnar ferrite, structural homogenity is improved, fitted simultaneously
When the crystallite dimension that reduction is finally organized, steel obdurability is improved；
(3) present invention devises corresponding cooling controlling and rolling controlling process, for appropriate drop to meet that above-mentioned metallographic structure control requires
The low crystallite dimension finally organized, control entry temperature at finishing is relatively low, improves roughing drafts；To obtain isometric columnar ferrite group
Knit, control coiling temperature is higher；
(4) crossbeam steel yield strength produced by the invention is >=355MPa, and tensile strength is 520~560MPa, extension
Rate is more than 26%, and 180 ° of cold bending test d=0.5a are qualified.With stable mechanical property, obdurability matching is good, forming property
With welding performance it is excellent the characteristics of.
Embodiment 1
Vehicle beam steel thick 6.0mm, using the micro- Ti of Nb- into shunt lead, is pre-processed, converter smelting, LF by molten iron
Heating furnace refining, continuous casting obtain steel billet, and finished product composition is：C 0.07%, Si 0.14%, Mn 1.31%, Nb 0.03%, Ti
0.024%, P 0.014%, S 0.004%.Steel billet relation reheating temperature is 1226 DEG C, rethermalization time 156min；Roughing uses 1
+ 5 passes, workpiece thickness 37mm；Finish rolling is 6 frame hot continuous rollings, and finishing temperature is 875 DEG C, after finish rolling terminates, is used
The leading portion type of cooling is cooled to 625 DEG C with 19 DEG C/s cooling velocity.
After testing, the height that the present embodiment is produced shapes vehicle beam and is with steel mechanical property：Yield strength 467MPa, resist
Tensile strength is 555MPa, elongation percentage 32.5%, and 180 ° of cold bending test d=0.5a are qualified.Metallographic structure be isometric columnar ferrite+
Pearlite, as shown in Figure 1, grain size are 11 grades.
Embodiment 2
Vehicle beam steel thick 5.0mm, using the micro- Ti of Nb- into shunt lead, is pre-processed, converter smelting, LF by molten iron
Heating furnace refining, continuous casting obtain steel billet, and finished product composition is：C 0.06%, Si 0.13%, Mn 1.33%, Nb 0.025%, Ti
0.025%, P 0.015%, S 0.005%.Steel billet relation reheating temperature is 1220 DEG C, rethermalization time 187min；Roughing uses 5
Passes, workpiece thickness 33mm；Finish rolling is 6 frame hot continuous rollings, and finishing temperature is 880 DEG C, after finish rolling terminates, before
The section type of cooling is cooled to 645 DEG C with 16 DEG C/s cooling velocity.
After testing, the height that the present embodiment is produced shapes vehicle beam and is with steel mechanical property：Yield strength 449MPa, resist
Tensile strength is 536MPa, elongation percentage 33.0%, and 180 ° of cold bending test d=0.5a are qualified.Metallographic structure is isometric ferrite+pearl
Body of light, as shown in Figure 2, grain size are 11 grades.
Comparative example 1
Steel for automobile crossbeam thick 8.0mm, using Mn-V microalloying routes, is pre-processed, converter smelting, LF by molten iron
Heating furnace refining, continuous casting obtain steel billet, and specific chemical composition percentage by weight is：C 0.09%, Si 0.34%, Mn
1.32%, V0.08%, P 0.020%, S 0.010%.Steel billet relation reheating temperature is 1231 DEG C, rethermalization time 204min；Slightly
Roll and use 5 passes, workpiece thickness 42mm, finish rolling is 7 frame hot continuous rollings, and finishing temperature is 804 DEG C, and finish rolling terminates
Afterwards, the leading portion type of cooling is used to be cooled to 604 DEG C with 27 DEG C/s cooling velocity.
After testing, the automotive frame steel mechanical property that this comparative example is produced is：Yield strength 350MPa, tensile strength are
513MPa, elongation percentage 27.0%, 180 ° of cold bending test d=2a are qualified.Metallographic structure is ferrite+pearlite, such as the institute of accompanying drawing 3
Show, its medium pearlite is distributed in ribbon, and grain size is 10.5 grades.
Comparative example 2
Steel for automobile crossbeam thick 3.0mm, using Mn-Ti microalloying routes, pre-processed by molten iron, converter smelting,
The refining of LF heating furnaces, continuous casting obtain steel billet, and specific chemical composition percentage by weight is：C 0.07%, Si 0.26%, Mn
1.12%, Ti0.05%, P 0.015%, S 0.004%.Steel billet relation reheating temperature is 1239 DEG C, rethermalization time 193min；
Roughing uses 5 passes, workpiece thickness 40mm, and finish rolling is 7 frame hot continuous rollings, and finishing temperature is 831 DEG C, and finish rolling terminates
Afterwards, the leading portion type of cooling is used to be cooled to 611 DEG C with 24 DEG C/s cooling velocity.
After testing, the automotive frame steel mechanical property that this comparative example is produced is：Yield strength 598MPa, tensile strength are
675MPa, elongation percentage 22.0%, 180 ° of cold bending test d=2a are qualified.Metallographic structure is ferrite+pearlite, such as the institute of accompanying drawing 4
Show part mixed grain structure and pearlite banded structure be present, grain size is 11.5 grades.
Claims (8)
- A kind of 1. vehicle beam hot-rolled steel, it is characterised in that：Described vehicle beam hot-rolled steel is to include following weight The alloying substance of part component,Described parts by weight of component includes C0.05%~0.12%, Mn1.0%~1.5%, Si0.01%~0.20%, Nb0.020%~0.040%, Ti >=0.010%, S≤0.010%, remaining is Fe and inevitable impurity,The microscopic structure of the alloying substance is isometric ferrite+pearlitic structrure, and its grain size is 10~12 grades, yield strength >= 355MPa, 510~610MPa of tensile strength, elongation percentage more than 24%, 180 ° of cold bending test d=a are qualified.
- A kind of 2. processing method for vehicle beam hot-rolled steel described in claim 1, it is characterised in that：Described processing side Method realizes the conjunction using Mn, Nb micro-alloying technology, micro- Ti processing, and the control of Si contents lowization by controlled rolling and controlled cooling Isometric ferrite+pearlitic structrure of golden material, and ensure that its grain size is 10~12 grades.
- 3. processing method according to claim 2, it is characterised in that：In During Controlled Rolling, the heating and temperature control of slab At 1200~1260 DEG C, the finishing temperature control of finish rolling is at 840~900 DEG C, and oiler temperature control is at 620~680 DEG C.
- 4. processing method according to claim 3, it is characterised in that：In finishing stands, entry temperature at finishing≤1020 DEG C, finishing temperature scope is 840~900 DEG C.
- 5. processing method according to claim 4, it is characterised in that：Control it is cold during, slab after finish rolling by 10~ 30 DEG C/sec of section cooling speed is cooled to 620~680 DEG C of coiling temperature.
- 6. processing method according to claim 2, it is characterised in that：Described production method also including molten steel continuous casting and The roughing of slab.
- 7. processing method according to claim 6, it is characterised in that：In the casting process of molten steel, plate that continuous casting forms The thickness of base is 200~250mm；In the rough rolling process of slab, roughing uses at least five passes, and each passage is rolled Deflection processed is necessary >=and 20%, the finish to gauge thickness of roughing is 32~38mm.
- 8. processing method according to claim 7, it is characterised in that：Described finishing pass is 5-7 passage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710693928.6A CN107502827A (en) | 2017-08-14 | 2017-08-14 | Vehicle beam hot-rolled steel and its processing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710693928.6A CN107502827A (en) | 2017-08-14 | 2017-08-14 | Vehicle beam hot-rolled steel and its processing method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109182909A (en) * | 2018-10-12 | 2019-01-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Automobile steering system medium carbon steel and its production method |
| CN110129669A (en) * | 2019-04-25 | 2019-08-16 | 首钢集团有限公司 | A kind of automobile tubulose trailing arm steel and preparation method thereof and steel pipe and preparation method thereof |
| CN113186469A (en) * | 2021-04-30 | 2021-07-30 | 攀钢集团攀枝花钢铁研究院有限公司 | 780 MPa-grade hot rolled steel plate for hydraulic bulging and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101701316A (en) * | 2009-11-06 | 2010-05-05 | 武汉钢铁(集团)公司 | Automobile beam steel with tensile strength of 590MPa and manufacturing method thereof |
| CN104745934A (en) * | 2015-03-26 | 2015-07-01 | 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 thereof |
-
2017
- 2017-08-14 CN CN201710693928.6A patent/CN107502827A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101701316A (en) * | 2009-11-06 | 2010-05-05 | 武汉钢铁(集团)公司 | Automobile beam steel with tensile strength of 590MPa and manufacturing method thereof |
| CN104745934A (en) * | 2015-03-26 | 2015-07-01 | 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 thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109182909A (en) * | 2018-10-12 | 2019-01-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Automobile steering system medium carbon steel and its production method |
| CN110129669A (en) * | 2019-04-25 | 2019-08-16 | 首钢集团有限公司 | A kind of automobile tubulose trailing arm steel and preparation method thereof and steel pipe and preparation method thereof |
| CN113186469A (en) * | 2021-04-30 | 2021-07-30 | 攀钢集团攀枝花钢铁研究院有限公司 | 780 MPa-grade hot rolled steel plate for hydraulic bulging and preparation method thereof |
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