CN108359906A - A kind of 800MPa grades of hot rolling acid-cleaning strips of no niobium low cost and its production method - Google Patents
A kind of 800MPa grades of hot rolling acid-cleaning strips of no niobium low cost and its production method Download PDFInfo
- Publication number
- CN108359906A CN108359906A CN201810499449.5A CN201810499449A CN108359906A CN 108359906 A CN108359906 A CN 108359906A CN 201810499449 A CN201810499449 A CN 201810499449A CN 108359906 A CN108359906 A CN 108359906A
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- CN
- China
- Prior art keywords
- hot rolling
- 800mpa
- rolling acid
- niobium
- cleaning
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- 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
-
- 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
- C21D2211/002—Bainite
-
- 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
Abstract
The present invention relates to hot rolling acid-cleaning strip technical field of producing more particularly to a kind of 800MPa grades of hot rolling acid-cleaning strips of no niobium low cost and its production methods；800MPa containing niobium grades of ferrite+bainite high-strength steels are to be relatively easy to a steel grade of design, but because adding a certain amount of niobium, cause production cost high, market competition force difference.The use of the present invention thoroughly solves the problems, such as that content of niobium is brought of high cost without niobium technology, can produce the hot rolling acid-cleaning plate that tensile strength >=800MPa and microstructure are ferrite+bainite, low production cost, and the market competitiveness is strong.
Description
Technical field
The present invention relates to hot rolling acid-cleaning strip technical field of producing more particularly to a kind of 800MPa grades of no niobium low costs
Hot rolling acid-cleaning strip and its production method.
Background technology
With the fast development of auto industry, requirement of the automobile to steel material is also more stringent.To steel material
While mechanical property requirements improve, machinability requirement of steel under the conditions of high intensity is also improved, to meet various automobiles
Particular/special requirement of the part to processing performance.Microstructure be ferrite+bainite high-strength steel composition with high intensity and it is excellent at
Shape performance, in this context, ferrite+bainite high-strength steel have obtained the extensive concern of car manufactures, and steel mill is according to oneself
The characteristics of work out multiple 800MPa products with their own characteristics.
Niobium alloy holds at high price, and steel grade adds content of niobium 0.05%, and steel-making cost just increases by 150 yuan or so, so
The high cost reduction market competitiveness of 800MPa grades of high-strength steel.800MPa grades of hot rolling acid-cleaning plates of no niobium low cost be this steel from
The product of main exploitation is mainly used for the safety knot component of superior automobile, is the representative steel grade of high-end Automobile Plate, before the application of market
Scape is wide.
Invention content
To solve the above problems, the present invention provides a kind of 800MPa grades of hot rolling acid-cleaning strips of no niobium low cost, contain niobium
800MPa grades of ferrite+bainite high-strength steels are to be relatively easy to a steel grade of design, but because adding a certain amount of niobium, cause
Production cost is high, market competition force difference.The present invention using no niobium technology thoroughly solve content of niobium bring it is of high cost
The problem of, tensile strength >=800MPa can be produced and microstructure is the hot rolling acid-cleaning plate of ferrite+bainite, production cost
Cheap, the market competitiveness is strong.
Solve above-mentioned technical problem technical solution be：
A kind of 800MPa grades of hot rolling acid-cleaning strips of no niobium low cost, include the material of following weight percent：C：0.03%
~0.08%, Si：0.30%~0.60%, Mn：1.00%~2.00%, (acid is molten by P≤0.015%, S≤0.010%, Als
Aluminium)：0.020%~0.070%, N≤0.0060%, Ti：0.05~0.15%；Surplus is iron and inevitable impurity.
By weight percentage, the 800MPa grade hot rolling acid-cleaning plates that thickness is 2.2mm roll up alloying component：C：0.07%,
Si：0.41%, Mn：1.87%, P：0.015%, S：0.002%, Als (dissolved aluminum)：0.051%, N：0.0050%, Ti：
0.11%, surplus is iron and inevitable impurity.
By weight percentage, the 800MPa grade hot rolling acid-cleaning plates that thickness is 2.6mm roll up alloying component：C：0.08%,
Si：0.50%, Mn：1.90%, P：0.013%, S：0.003%, Als (dissolved aluminum)：0.065%, N：0.0055%, Ti：
0.10%, surplus is iron and inevitable impurity.
By weight percentage, the 800MPa grade hot rolling acid-cleaning plates that thickness is 4.0mm roll up alloying component：C：0.06%,
Si：0.46%, Mn：1.89%, P：0.011%, S：0.001%, Als (dissolved aluminum)：0.063%, N：0.0045%, Ti：
0.11%, surplus is iron and inevitable impurity.
The 800MPa grade hot rolling acid-cleaning coiled sheets of 2.0~6.0mm of thickness, yield strength >=650MPa, tensile strength >=
800MPa, elongation percentage A80 >=10%, steel plate thickness ＜ 3.0mm；Elongation percentage A >=12%；Steel plate thickness >=3.0mm.
A kind of preparation method of no 800MPa grades of hot rolling acid-cleaning strips of niobium low cost, includes the following steps：1) strand is poured into a mould；
2) continuous casting billet is placed in walking beam furnace and is heated, 40~80min is kept the temperature at 1200-1270 DEG C；Strand carries out high after coming out of the stove
After pressing water de-scaling, rolled into roughing mill；Intermediate 950~1050 DEG C of base temperature, subsequently enters mm finishing mill unit rolling, eventually after roughing
Roll 820 DEG C -870 DEG C of temperature；It is batched after section cooling, 400 DEG C -500 DEG C of coiling temperature；Coils of hot-rolled steel it is hot rolled it is smooth after in acid
It washes production line and carries out pickling, oiling.
Beneficial effects of the present invention：
1) of low cost, competitiveness is strong
Due to not adding expensive niobium alloy, production cost is greatly reduced, and promotes product competitiveness in the market；Compared to existing
There is technology production cost to reduce 100-200 members.
2) simple for process, without controlling phosphorus content
P content≤0.015% in this patent, conventional STEELMAKING PRODUCTION can meet, and not need special dephosphorization system；And it is existing
P content control in technology is less than 0.008%, needs to carry out dephosphorization treatment, increases process, complex process.
Specific implementation mode
Embodiment 1
In the present embodiment, by weight percentage, the 800MPa grade hot rolling acid-cleaning plates that thickness is 2.2mm roll up alloying component
For：C：0.07%, Si：0.41%, Mn：1.87%, P：0.015%, S：0.002%, Als (dissolved aluminum)：0.051%, N：
0.0050%, Ti：0.11%, surplus is iron and inevitable impurity.
In the present embodiment, thickness is that the production method of the 800MPa grade hot rolling acid-cleaning coiled sheets of 2.2mm is as follows：
1) molten steel according to a conventional method, pours into strand；
2) strand is placed in walking beam furnace and is heated, 60min is kept the temperature at 1250 DEG C；Strand is come out of the stove laggard horizontal high voltage water
It after de-scaling, is rolled into roughing mill, roughing de-scaling water input, 1130 DEG C of start rolling temperature；Intermediate 1050 DEG C of base temperature after roughing, with
Enter mm finishing mill unit afterwards to roll, 850 DEG C of finishing temperature；It is batched after section cooling, 420 DEG C of coiling temperature.It is organized as ferrite+shellfish
Family name's body, product yield strength (ReH) 824MPa, tensile strength (Rm) 851MPa, elongation after fracture (A80) 12%.
Embodiment 2
In the present embodiment, by weight percentage, the 800MPa grade hot rolling acid-cleaning plates that thickness is 2.6mm roll up alloying component
For：C：0.08%, Si：0.50%, Mn：1.90%, P：0.013%, S：0.003%, Als (dissolved aluminum)：0.065%, N：
0.0055%, Ti：0.10%, surplus is iron and inevitable impurity.
In the present embodiment, thickness is that the production method of the 800MPa grade hot rolling acid-cleaning coiled sheets of 2.6mm is as follows：
1) molten steel according to a conventional method, pours into strand；
2) strand is placed in walking beam furnace and is heated, 60min is kept the temperature at 1240 DEG C；Strand is come out of the stove laggard horizontal high voltage water
It after de-scaling, is rolled into roughing mill, roughing de-scaling water input, 1120 DEG C of start rolling temperature；Intermediate 1020 DEG C of base temperature after roughing, with
Enter mm finishing mill unit afterwards to roll, 840 DEG C of finishing temperature；It is batched after section cooling, 450 DEG C of coiling temperature.It is organized as ferrite+shellfish
Family name's body, product yield strength (ReH) 764MPa, tensile strength (Rm) 838MPa, elongation after fracture (A80) 15%.
Embodiment 3
In the present embodiment, by weight percentage, the 800MPa grade hot rolling acid-cleaning plates that thickness is 4.0mm roll up alloying component
For：C：0.06%, Si：0.46%, Mn：1.89%, P：0.011%, S：0.001%, Als (dissolved aluminum)：0.063%, N：
0.0045%, Ti：0.11%, surplus is iron and inevitable impurity.
In the present embodiment, thickness is that the production method of 800MPa grades of hot rolling acid-cleaning coiled sheets of 4.0mm is as follows：
1) molten steel according to a conventional method, pours into strand；
2) strand is placed in walking beam furnace and is heated, 60min is kept the temperature at 1260 DEG C；Strand is come out of the stove laggard horizontal high voltage water
It after de-scaling, is rolled into roughing mill, roughing de-scaling water input, 1120 DEG C of start rolling temperature；Intermediate 1030 DEG C of base temperature after roughing, with
Enter mm finishing mill unit afterwards to roll, 830 DEG C of finishing temperature；It is batched after section cooling, 430 DEG C of coiling temperature.It is organized as ferrite+shellfish
Family name's body, product yield strength (ReH) 768MPa, tensile strength (Rm) 818MPa, elongation after fracture (A80) 22.5%.
Claims (6)
1. a kind of 800MPa grades of hot rolling acid-cleaning strips of no niobium low cost, which is characterized in that include the material of following weight percent：
C：0.03%~0.08%, Si：0.30%~0.60%, Mn：1.00%~2.00%, P≤0.015%, S≤0.010%,
Als (dissolved aluminum)：0.020%~0.070%, N≤0.0060%, Ti：0.05~0.15%；Surplus is for iron and inevitably
Impurity.
2. a kind of 800MPa grades of hot rolling acid-cleaning strips of no niobium low cost according to claim 1, which is characterized in that by weight
Percentages, the 800MPa grade hot rolling acid-cleaning plates volume alloying component that thickness is 2.2mm are：C：0.07%, Si：0.41%, Mn：
1.87%, P：0.015%, S：0.002%, Als (dissolved aluminum)：0.051%, N：0.0050%, Ti：0.11%, surplus is iron
With inevitable impurity.
3. a kind of 800MPa grades of hot rolling acid-cleaning strips of no niobium low cost according to claim 1, which is characterized in that by weight
Percentages, the 800MPa grade hot rolling acid-cleaning plates volume alloying component that thickness is 2.6mm are：C：0.08%, Si：0.50%, Mn：
1.90%, P：0.013%, S：0.003%, Als (dissolved aluminum)：0.065%, N：0.0055%, Ti：0.10%, surplus is iron
With inevitable impurity.
4. a kind of 800MPa grades of hot rolling acid-cleaning strips of no niobium low cost according to claim 1, which is characterized in that by weight
Percentages, the 800MPa grade hot rolling acid-cleaning plates volume alloying component that thickness is 4.0mm are：C：0.06%, Si：0.46%, Mn：
1.89%, P：0.011%, S：0.001%, Als (dissolved aluminum)：0.063%, N：0.0045%, Ti：0.11%, surplus is iron
With inevitable impurity.
5. a kind of 800MPa grades of hot rolling acid-cleaning strips of no niobium low cost according to claim 1, which is characterized in that thickness
The 800MPa grade hot rolling acid-cleaning coiled sheets of 2.0~6.0mm, yield strength >=650MPa, tensile strength >=800MPa, elongation percentage A80
>=10%, steel plate thickness ＜ 3.0mm；Elongation percentage A >=12%；Steel plate thickness >=3.0mm.
6. a kind of preparation method of no 800MPa grades of hot rolling acid-cleaning strips of niobium low cost described in claim 1-5, feature exist
In including the following steps：1) strand is poured into a mould；2) continuous casting billet is placed in walking beam furnace and is heated, kept the temperature at 1200-1270 DEG C
40~80min；Strand is come out of the stove after laggard horizontal high voltage water de-scaling, is rolled into roughing mill；Intermediate base temperature 950~1050 after roughing
DEG C, subsequently enter mm finishing mill unit rolling, 820 DEG C -870 DEG C of finishing temperature；It is batched after section cooling, 400 DEG C -500 of coiling temperature
℃；Coils of hot-rolled steel it is hot rolled it is smooth after pickling lines carry out pickling, oiling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810499449.5A CN108359906A (en) | 2018-05-23 | 2018-05-23 | A kind of 800MPa grades of hot rolling acid-cleaning strips of no niobium low cost and its production method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810499449.5A CN108359906A (en) | 2018-05-23 | 2018-05-23 | A kind of 800MPa grades of hot rolling acid-cleaning strips of no niobium low cost and its production method |
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| CN108359906A true CN108359906A (en) | 2018-08-03 |
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| CN201810499449.5A Pending CN108359906A (en) | 2018-05-23 | 2018-05-23 | A kind of 800MPa grades of hot rolling acid-cleaning strips of no niobium low cost and its production method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116219297A (en) * | 2022-12-14 | 2023-06-06 | 本钢板材股份有限公司 | Hot-rolled pickled steel plate with excellent formability and production method thereof |
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| CN103108973A (en) * | 2010-09-17 | 2013-05-15 | 杰富意钢铁株式会社 | High-strength hot-rolled steel sheet having superior punchability and method for producing same |
| CN103108972A (en) * | 2010-09-17 | 2013-05-15 | 杰富意钢铁株式会社 | High-strength hot-rolled steel sheet having excellent bending workability and method for producing same |
| CN103108974A (en) * | 2010-09-17 | 2013-05-15 | 杰富意钢铁株式会社 | High-strength hot rolled steel sheet having excellent toughness and method for producing same |
| JP2014218692A (en) * | 2013-05-07 | 2014-11-20 | 新日鐵住金株式会社 | High yield ratio and high strength hot rolled steel and manufacturing method therefor |
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2018
- 2018-05-23 CN CN201810499449.5A patent/CN108359906A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103108973A (en) * | 2010-09-17 | 2013-05-15 | 杰富意钢铁株式会社 | High-strength hot-rolled steel sheet having superior punchability and method for producing same |
| CN103108972A (en) * | 2010-09-17 | 2013-05-15 | 杰富意钢铁株式会社 | High-strength hot-rolled steel sheet having excellent bending workability and method for producing same |
| CN103108974A (en) * | 2010-09-17 | 2013-05-15 | 杰富意钢铁株式会社 | High-strength hot rolled steel sheet having excellent toughness and method for producing same |
| CN102719755A (en) * | 2012-05-31 | 2012-10-10 | 攀钢集团攀枝花钢铁研究院有限公司 | High-strength high-processability hot-rolled pickled plate for automobile structures and production method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116219297A (en) * | 2022-12-14 | 2023-06-06 | 本钢板材股份有限公司 | Hot-rolled pickled steel plate with excellent formability and production method thereof |
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