CN106811690B - A kind of preparation method of low-density lightweight steel - Google Patents
A kind of preparation method of low-density lightweight steel Download PDFInfo
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- CN106811690B CN106811690B CN201710030964.4A CN201710030964A CN106811690B CN 106811690 B CN106811690 B CN 106811690B CN 201710030964 A CN201710030964 A CN 201710030964A CN 106811690 B CN106811690 B CN 106811690B
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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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- Mechanical Engineering (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A kind of preparation method of low-density lightweight steel, chemical composition are calculated as with quality percentage：C 0.3% 0.4%, Mn8.5% 10%, Al 4% 5%, P+S+N≤0.009%, remaining be Fe and inevitable impurity, which is 7.35g/cm3~7.5g/cm3, preparation process smelted using vacuum smelting furnace and is cast into steel ingot and then forging, hot rolling, solution treatment, water cooling, obtains the low-density lightweight steel that elongation after fracture is more than 40%.
Description
Technical field
The invention belongs to automobile high-strength steel technical field, more particularly to a kind of preparation method of low-density lightweight steel.
Background technology
In recent years, people adopt various measures, and reply automobile industry is energy-saving, requirement of safety and environmental protection.Automotive light weight technology
It is one of achievable measure.Car mass often reduces by 10%, can save fuel oil 3-7%.Fuel consumption often reduces 1 liter, can
Reduce the CO2 emission of about 2.45kg.
Automobile lightweight mainly has following two approach：First, using light material, such as using the aluminium of low-density and
Aluminium alloy, magnesium and magnesium alloy, engineering plastics or carbon fibre composite etc.；Second is that substitute common iron, drop using high strength steel
Low steel plate thickness specification.
Aluminium alloy has good loss of weight potentiality, but of high cost, complex forming technology, welding performance are poor, impact absorption energy
The factors such as low and aluminium element self-characteristic limit its research and development and marketing.For this purpose, automobile lightweight just concentrates on
The research and development of automobile high-strength steel.
The present invention sets about from the physical property of steel, and the density of steel is reduced by the content for improving C, Mn, Al, mitigates steel in itself
Quality, while controlled and optimized using optimizing components and preparation process, realized under the premise of automobile structure intensity is not sacrificed
The lightweight of steel has certain industrial realization and actual application value.
Invention content
In order to solve high-strength steel lightweight problem, the present invention proposes a kind of preparation method of low-density lightweight steel.This hair
Bright chemical composition is simple, and the density of steel is reduced by the content for improving C, Mn, Al, mitigates steel quality in itself, at the same using into
Point optimization with preparation process control optimize, realize low-density, suitable strength plasticity matching, high strength and ductility target, have one
Fixed industrial realization and actual application value.
The present invention provides a kind of preparation method of low-density lightweight steel, chemical composition is calculated as with quality percentage：C
0.3%-0.4%, Mn 8.5%-10%, Al 4%-5%, P+S+N≤0.009%, remaining be Fe and inevitable impurity,
Density is 7.35g/cm3~7.5g/cm3。
A kind of preparation method of low-density lightweight steel provided by the invention, preparation process include the following steps：
(1) vacuum smelting furnace is smelted, and casting obtains the steel ingot for meeting the chemical composition；By Heating Steel Ingots to 1150-
It 1200 DEG C, is forged after keeping the temperature 1-2h, 1000-1100 DEG C of starting forging temperature, 950-1000 DEG C of final forging temperature obtains forging stock；
(2) forging stock is stripped off the skin processing, after removing scale on surface, is put into heating furnace and heats, when heating uses nitrogen
Protection, is heated to keeping the temperature 1-2h at 1150 DEG C, then proceeds by two passage roughing, in 1100 DEG C of nitrogen protection stove after roughing
Middle heat preservation 10-30min, obtains roughing steel band；
(3) roughing steel band carries out hot rolling, carries out water cooling after finish to gauge at once, and steel band is put into mould in holding furnace after water cooling
Plan is batched, and obtains the hot rolled strip of 2.8-3.2mm；
(4) hot rolled strip is heated into solid solution isothermal processes, then carries out quick water cooling, obtain finished product steel belt.
Further, the hot rolling start rolling temperature of the step (3) is 1000-1150 DEG C, 5 passes, every time pressure
Amount between 35%-45%, finishing temperature be 900-980 DEG C, after finish to gauge at once with the cooldown rate water cooling of >=50 DEG C/s extremely
It 400-500 DEG C, then puts it into heat preservation 0.5-2h in 400-500 DEG C of holding furnace and batches, 2.8- is obtained after taking-up is air-cooled
The hot rolled strip of 3.2mm.
The steel band solid solution temperature of the further step (4) is 700-800 DEG C, time 0.5-2.5h, solid solution
Finished product steel belt is obtained to room temperature with the quick water cooling of the cooldown rate of >=100 DEG C/s afterwards.
Preferably, the hot rolling start rolling temperature of the step (3) is 1100 DEG C, and finishing temperature is 950 DEG C；When holding furnace batches
Temperature is 450 DEG C, soaking time 1h.
Preferably, the steel band solid solution temperature of the step (4) is 750 DEG C, time 1-2h.
The Design of Chemical Composition of the present invention is simple, and while considering each element content, its essential element is optimized
Design, defines that density meets 7.39g/cm3- 0.0085 (%Mn)≤7.45g/ of≤8.10-0.101 (%Al)-0.41 (%C)
cm3Requirement, the optimal mechanical property that selection process ingredient obtains be yield strength 564.2-585.8MPa, tensile strength
752.2-786.2MPa elongation percentage 43.5-45.4%, strength and ductility product 33.5-35.2GPa%.
Description of the drawings
Fig. 1 a, Fig. 1 b and Fig. 1 c are respectively 1000 times of finished product microstructure pictures of embodiment 1, embodiment 2, embodiment 3；
Fig. 2 a, Fig. 2 b and Fig. 2 c are respectively comparative example 3, b comparative examples 4,500 times of finished product microscopic structures of c comparative examples 5 photograph
Piece.
Specific embodiment
In order to understand the present invention in depth, below in conjunction with the accompanying drawings, specific embodiment and comparative example carried out the present invention in detail
It describes in detail bright.
Embodiment 1
The chemical composition of embodiment 1 is as shown in table 1 in terms of quality percentage.Vacuum smelting furnace is smelted, and casting obtains steel ingot；It will
Heating Steel Ingots are forged, 1080 DEG C of starting forging temperature, 980 DEG C of final forging temperature obtains forging stock to 1180 DEG C after keeping the temperature 1.5h；Forging
Base strips off the skin processing, after removing scale on surface, is put into heating furnace and heats, and when heating is protected using nitrogen, is heated to 1150
DEG C when heat preservation 1.5h after proceed by two passage roughing, keep the temperature 20min in 1100 DEG C of nitrogen protection stove after roughing, obtain thick
Strip rolling；Roughing steel band carry out hot rolling, 1100 DEG C of start rolling temperature, 5 passes, draught per pass between 35%-45%,
Finishing temperature is 950 DEG C, at once with the cooldown rate water cooling of >=50 DEG C/s to 450 DEG C after finish to gauge, then puts it into 450 DEG C
1h is kept the temperature in holding furnace to batch, and the hot rolled strip of 2.8-3.2mm is obtained after taking-up is air-cooled.Hot rolled strip is subjected to solution treatment,
Temperature is 750 DEG C, time 1h, and finished product steel belt is obtained to room temperature with the quick water cooling of the cooldown rate of >=100 DEG C/s after solid solution.
End properties are as shown in table 2.Finished product microscopic structure is shown in attached drawing 1.
Embodiment 2
2 chemical composition of embodiment in terms of quality percentage as shown in table 1, using preparation process substantially the same manner as Example 1,
Only difference is that the solid solution temperature of embodiment 2 is 750 DEG C, time 1.5h.End properties are as shown in table 2.Into
Product microscopic structure is shown in attached drawing 1.
Embodiment 3
3 chemical composition of embodiment in terms of quality percentage as shown in table 1, using preparation process substantially the same manner as Example 1,
Only difference is that the solid solution temperature of embodiment 3 is 750 DEG C, time 2h.End properties are as shown in table 2.Finished product
It organizes micro- to see attached drawing 1.
Comparative example 1
The chemical composition of comparative example 1 is the same as embodiment 1, using preparation process substantially the same manner as Example 1, unique difference
It is in the solid solution temperature of comparative example 1 is 750 DEG C, time 0.5h.End properties are as shown in table 2.
Comparative example 2
The chemical composition of comparative example 2 is the same as embodiment 1, using preparation process substantially the same manner as Example 1, unique difference
It is in the solid solution temperature of comparative example 2 is 600 DEG C, time 1h.End properties are as shown in table 2.
Comparative example 3
The chemical composition of comparative example 3 is the same as embodiment 2, using preparation process substantially the same manner as Example 2, unique difference
It is in the solid solution temperature of comparative example 3 is 800 DEG C, time 1h.End properties are as shown in table 2.Finished product microscopic structure is shown in
Attached drawing 2.
Comparative example 4
The chemical composition of comparative example 4 is the same as embodiment 3, using preparation process substantially the same manner as Example 3, unique difference
It is in the solid solution temperature of comparative example 3 is 900 DEG C, time 1h.End properties are as shown in table 2.Finished product microscopic structure is shown in
Attached drawing 2.
Comparative example 4
The chemical composition of comparative example 5 is the same as embodiment 3, using preparation process substantially the same manner as Example 3, unique difference
It is in the solid solution temperature of comparative example 3 is 1000 DEG C, time 1h.End properties are as shown in table 2.Finished product microscopic structure
See attached drawing 2.
The chemical composition of table 1, the embodiment of the present invention and comparative example
The end properties of table 2, the embodiment of the present invention and comparative example
It can see from embodiment and comparative example and obtained accordingly result, can be obtained using present component and technique
To intensity height, good percentage elongation, strength and ductility product height, low density high-strength light steel.It can be seen that and be dissolved from the end properties of table 2
The isothermal solution treatment of 750 DEG C of progress 1-2h of temperature, the mechanical property that finished product can be optimal.Although 1 strength and ductility product of comparative example
Also reach 30GPa%, but its elongation percentage, less than 40%, overall performance is slightly inferior to embodiment 1-3.Other comparative example performances with
The raising of solid solubility temperature is gradually deteriorated, and tensile strength raising is apparent, but elongation percentage, strength and ductility product, retained austenite percentage are straight
Line declines.
It should be noted last that above-described specific embodiment, to the purpose of the present invention, technical solution and beneficial
Effect has been further described, it should be understood that the foregoing is merely the specific embodiment of the present invention, and
Be not intended to limit the invention, it is all within the spirit and principle of technical solution of the present invention, any modification for being made, equivalent replacement,
Improve etc., it should be included within the claims of the present invention.
Claims (3)
1. a kind of preparation method of low-density lightweight steel, chemical composition are calculated as with quality percentage：C 0.3%-0.4%, Mn
8.5%-10%, Al 4%-5%, P+S+N≤0.009%, remaining be Fe and inevitable impurity, which is
7.35g/cm3~7.5g/cm3；
Preparation process includes the following steps：
(1) vacuum smelting furnace is smelted, and casting obtains the steel ingot for meeting the ingredient；By Heating Steel Ingots to 1150-1200 DEG C, heat preservation
It is forged after 1-2h, 1000-1100 DEG C of starting forging temperature, 950-1000 DEG C of final forging temperature obtains forging stock；
(2) forging stock being stripped off the skin processing, after removing scale on surface, is put into heating furnace and heats, when heating, is protected using nitrogen,
It is heated to keeping the temperature 1-2h at 1150 DEG C, then proceeds by two passage roughing, protected in 1100 DEG C of nitrogen protection stove after roughing
Warm 10-30min obtains roughing steel band；
(3) roughing steel band carries out hot rolling, carries out water cooling after finish to gauge at once, and steel band is put into analog roll in holding furnace after water cooling
It takes, obtains the hot rolled strip of 2.8-3.2mm；
(4) hot rolled strip heating is subjected to solid solution isothermal processes, then carries out quick water cooling, obtain finished product steel belt；
The hot rolling start rolling temperature of the step (3) is 1000-1150 DEG C, and 5 passes, draught per pass is in 35%-45%
Between, finishing temperature is 900-980 DEG C, at once with the cooldown rate water cooling of >=50 DEG C/s to 400-500 DEG C after finish to gauge, then will
It is put into 400-500 DEG C of holding furnace and is batched after heat preservation 0.5-2h, and the hot-rolled steel of 2.8-3.2mm is obtained after taking-up is air-cooled
Band；
The steel band solid solution isothermal treatment temperatures of the step (4) are 700-800 DEG C, time 0.5-2.5h, with >=100 after solid solution
DEG C/the quick water cooling of cooldown rate of s to room temperature, obtain finished product steel belt.
A kind of 2. preparation method of low-density lightweight steel as described in claim 1, which is characterized in that the heat of the step (3)
It is 1100 DEG C to roll start rolling temperature, and finishing temperature is 950 DEG C；Temperature is 450 DEG C when holding furnace batches, soaking time 1h.
A kind of 3. preparation method of low-density lightweight steel as described in claim 1, which is characterized in that the steel of the step (4)
Band solid solution isothermal treatment temperatures are 750 DEG C, time 1-2h.
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| CN201710030964.4A CN106811690B (en) | 2017-01-17 | 2017-01-17 | A kind of preparation method of low-density lightweight steel |
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| CN201710030964.4A CN106811690B (en) | 2017-01-17 | 2017-01-17 | A kind of preparation method of low-density lightweight steel |
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| CN106811690A CN106811690A (en) | 2017-06-09 |
| CN106811690B true CN106811690B (en) | 2018-07-06 |
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| CN107326282B (en) * | 2017-07-13 | 2018-09-14 | 武汉钢铁有限公司 | 600MPa grades of high-yield-ratio hot rolling high-strength light steel and its manufacturing method |
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|---|---|---|---|---|
| US4966636A (en) * | 1988-07-08 | 1990-10-30 | Famcy Steel Corporation | Two-phase high damping capacity F3-Mn-Al-C based alloy |
| CN103667883A (en) * | 2013-12-26 | 2014-03-26 | 北京科技大学 | Low-density and high-toughness automobile-used steel board and preparation process |
| CN103695765A (en) * | 2013-12-11 | 2014-04-02 | 蔡志辉 | Cold-rolled medium manganese steel with high strength and high plasticity and preparation method thereof |
| CN104674109A (en) * | 2015-03-11 | 2015-06-03 | 北京科技大学 | Low-density Fe-Mn-Al-C system cold-rolled automobile steel plate and preparation method |
| CN104694816A (en) * | 2015-03-13 | 2015-06-10 | 北京科技大学 | Preparation method of high-Al medium manganese steel with strength and ductility product exceeding 30GPa% |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005146321A (en) * | 2003-11-13 | 2005-06-09 | Nippon Steel Corp | Steel having fine structure, and its production method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4966636A (en) * | 1988-07-08 | 1990-10-30 | Famcy Steel Corporation | Two-phase high damping capacity F3-Mn-Al-C based alloy |
| CN103695765A (en) * | 2013-12-11 | 2014-04-02 | 蔡志辉 | Cold-rolled medium manganese steel with high strength and high plasticity and preparation method thereof |
| CN103667883A (en) * | 2013-12-26 | 2014-03-26 | 北京科技大学 | Low-density and high-toughness automobile-used steel board and preparation process |
| CN104674109A (en) * | 2015-03-11 | 2015-06-03 | 北京科技大学 | Low-density Fe-Mn-Al-C system cold-rolled automobile steel plate and preparation method |
| CN104694816A (en) * | 2015-03-13 | 2015-06-10 | 北京科技大学 | Preparation method of high-Al medium manganese steel with strength and ductility product exceeding 30GPa% |
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