CN106636890B - Direct hot forming thin format hot rolled steel plate and its manufacturing method - Google Patents
Direct hot forming thin format hot rolled steel plate and its manufacturing method Download PDFInfo
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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
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- 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
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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
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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Abstract
The invention discloses a kind of direct hot forming thin format hot rolled steel plate and its manufacturing method, the chemical composition and its weight percent of the steel plate are as follows：C：0.12~0.50%, Si：0.15~0.65%, Mn：0.70~2.0%, P≤0.015%, S≤0.008%, Als：0.015~0.06%, N≤0.005%, B≤0.005%, Cr：0.15~0.65%, Nb：0.005~0.060% or Ti：0.005~0.06% or V:Two or three of element is mixed with arbitrary proportion in 0.005~0.06% or Nb, Ti and V, and mixed total weight percent≤0.10%, remaining is iron and inevitable impurity.The present invention not only shortens the manufacturing process of hot forming steel, solves the problems, such as that traditional hot forming steel making technological process is long and complex, but also finally obtained hot forming steel mechanical property is excellent；The present invention simultaneously eliminates pickling process, not only increases production efficiency, reduces production cost, also avoids pickling and pollute the environment.
Description
Technical field
The present invention relates to hot-rolling high-strength steel manufacturing technology fields, in particular to a kind of direct hot forming Thin Specs hot-rolled steel
Plate and its manufacturing method.
Background technology
With increasingly sharpening for energy crisis and environmental problem, what lightweight had become auto industry sustainable development must
So selection.Vehicle body high strengthening can not only mitigate car body weight, but also can improve safety, be to realize body lightening simultaneously and carry
The preferred approach of high crashworthiness.To meet vehicle body high strengthening growth requirement, the intensity of vehicle structure steel is also higher and higher,
But the problem of at the same time, super-high strength steel forming property in cold punching pressing formation is poor, and part springs back serious and poor dimensional precision
More and more prominent, in this context, hot press-formed technology and hot forming steel come into being.The 1980s, auto industry was opened
Begin to use hot forming techniques, be applied for a patent earliest by the swedish company Plannja in Lule, first safety component is Sa Bo
9000 protecting against shock curb girder.Hot forming techniques are widely used to the manufacture of body of a motor car breaking piece.
The main manufacturer and product grade of domestic and international hot forming steel have the USIBOR1500 of ARCELOR, SSAB's
The BORON steel of DOMEX 024B, NIPPON STEEL and the BR1500HS etc. of Baosteel.The traditional processing technology stream of hot forming steel
Cheng Wei：Desulphurised hot metal → converter smelting → external refining → continuous casting → heating of plate blank → hot continuous rolling → pickling+cold continuous rolling → continuous
Annealing → (precoated shet) → finishing is packed.It has the following disadvantages：1) production procedure is long, complex process, and cost is excessively high；2) hot
Iron scale is easy to fall off in forming process, also needs additionally to increase uncoiling pickling process before hot forming.Such as：Chinese patent
CN103361560A discloses a kind of cold rolling hot forming steel plate and its production method, this method obtain molten steel by continuous casting after refining
Slab is obtained, then carries out hot rolling, and hot rolled plate is subjected to section cooling into hot rolled coil；Chill volume is obtained by cold rolling again, finally
Chill volume is obtained into strip by bell-type annealing processing, to which successfully production high-strength hot shapes steel plate.Using the technique, production
Long flow path, it is of high cost.To solve the problems, such as this, 105441786 A of Chinese patent CN disclose a kind of tensile strength 1500MPa grades
It is hot press-formed to be with sheet metal and its CSP production methods, process route：Smelting molten steel, vertical bending type CSP sheet blank continuous castings,
De-scaling, the soaking of roller-bottom type continuous tunnel furnace, six rack hot continuous rollings of TMCP, section cooling, batch, uncoiling pickling, it is smooth, batch.Using
The technological process can substitute flat cold-rolled sheet with hot rolled sheet, to cancel the processes such as plate cold rolling and annealing heat-treats.Deficiency
Be in：It needs that the special technological process of production, popularization and application is used to be subject to certain restrictions；In addition, due to right in production process
Scale on surface lacks control, to avoid heat forming processes iron scale from falling off, also needs to first carry out uncoiling before hot forming
Pickling is increasing production cost and to the pollution of environment to a certain degree.
Invention content
Present invention aim to provide a kind of direct hot forming thin format hot rolled steel plate and its manufacturing method, the steel
Plate shortens the manufacturing process of hot forming steel, and eliminates pickling process, and then significantly reduces cost and environmental pollution.
To achieve the above object, the technical solution adopted by the present invention is：A kind of direct hot forming thin format hot rolled steel plate,
It is characterized in that：The chemical composition and its weight percent of the steel plate are as follows：C：0.12~0.50%, Si：0.15~0.65%,
Mn：0.70~2.0%, P≤0.015%, S≤0.008%, Als：0.015~0.06%, N≤0.005%, B≤0.005%,
Cr：0.15~0.65%, Nb：0.005~0.060% or Ti：0.005~0.06% or V:0.005~0.06% or Nb,
Two or three of element is mixed with arbitrary proportion in Ti and V, and mixed total weight percent≤0.10%, remaining for iron and
Inevitable impurity.
Further, the chemical composition of the steel plate and its weight percent are as follows：C：0.25~0.50%, Si：0.30~
0.65%, Mn：1.20~2.0%, P：0.01~0.015%, S：0.005~0.008%, Als：0.02~0.06%, N:
0.004~0.005%, B：0.004~0.005%, Cr：0.25~0.65%, Nb：0.03~0.060%, Ti：0.02~
0.05%, and mixed total weight percent≤0.10% of Nb and Ti, remaining is iron and inevitable impurity.
Further, the chemical composition of the steel plate and its weight percent are as follows：C：0.40~0.50%, Si：0.44~
0.65%, Mn：1.7.0%, P：0.01~0.015%, S：0.005~0.008%, Als：0.02~0.06%, N:0.004~
0.005%, B：0.004~0.005%, Cr：0.5~0.65%, Nb：0.05~0.060%, Ti：0.02~0.03%, V:
0.01~0.02%, and Nb, Ti and mixed total weight percent≤0.10% of V, remaining is iron and inevitable impurity.
Further, the steel plate thickness is 1.5~3.0mm.
The manufacturing method of above-mentioned direct hot forming thin format hot rolled steel plate, including converter smelting, refining, continuous casting, strand
Heating, roughing, finish rolling and batches step at section cooling, and in the heating strand step, heating temperature is 1250~1350 DEG C；
In the roughing step, the workpiece thickness after roughing is 25~45mm, roughing de-scaling temperature >=1170 DEG C；The finish rolling step
In, the reduction ratio of two passages is respectively 43~48% and 40~45% before finish rolling, and final reduction rate is 10~15%, after finish rolling
Belt steel thickness is 1.5~3.0mm, and finishing temperature is 850~920 DEG C；Described to batch in step, coiling temperature is 500~680
℃。
Further, in the continuous casting step, slab thickness is 210~250mm；In the roughing step, rough rolling process
For 5 or 7 passages；In the finish rolling step, finishing stands are 7 passages, and finish rolling previous three passes use interstand cooling.
Further, increase insulation cover or Coil Box between roughing and finish rolling, the intermediate base head and tail temperature difference after roughing≤
±15℃。
Further, in the finish rolling step, using lubrication and rolling, wherein oil pressure is 0.5~0.8MPa, hydraulic pressure 0.4
~0.6MPa, a concentration of the 0.3~0.6% of emulsion.
Further, in the finish rolling step, finishing temperature is 880~920 DEG C.
Further, described to batch in step, coiling temperature is 540~580 DEG C.
Compared with prior art, the present invention has the following advantages：
First, the present invention realizes the production that thickness is 1.5~3.0mm Thin Specs hot forming hot rolled steel plates, can be used
In substituting cold-reduced sheet heat is not only shortened to eliminate the processes such as plate cold rolling and annealing heat-treats as hot forming raw material
The manufacturing process of forming steel solves the problems, such as that traditional hot forming steel making technological process is long and complex, but also finally obtaining
Hot forming steel mechanical property it is excellent.
Surfaces of Hot Rolled Strip is aoxidized second, the present invention by the optimal control to course of hot rolling technological parameter, realizes
The Precise control of thickness of scale and structure to improve the adhesive force of iron scale, and then can cancel pickling process, not only carry
High production efficiency, reduces production cost, also avoids pickling and pollute the environment.
Third, the present invention is carried out based on traditional hot continuous rolling flow, tool adaptable to current similar producing line both at home and abroad
There is good application value.
Description of the drawings
Fig. 1 is the iron scale pattern picture of Thin Specs hot rolled plate of the present invention.
Fig. 2 is the iron scale pattern picture after Thin Specs hot rolled plate hot forming of the present invention.
Specific implementation mode
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments, convenient for more clearly understanding this
Invention, but they do not constitute the present invention and limit.
Examples 1 to 6
Direct hot forming in following embodiment is manufactured as follows with thin format hot rolled steel plate：
1) converter smelting；
2) it refines；
3) continuous casting：The slab thickness is 210~250mm；
4) heating strand：Charging temperature≤550 DEG C, heating temperature are 1250~1350 DEG C；
5) roughing：Rough rolling process is 5 passages or 7 passages, and the workpiece thickness after roughing is 25~45mm；Roughing de-scaling temperature
>=1170 DEG C of degree；
6) finish rolling：Finishing stands are 7 passages, and the reduction ratio of two passages is respectively 43~48% and 40~45% before finish rolling,
Final reduction rate is 10~15%, and belt steel thickness is 1.5~3.0mm after finish rolling；Finishing stands previous three passes use between rack
It is cooling；Finishing temperature is 850~920 DEG C, preferably 880~920 DEG C；Finishing stands use lubrication and rolling, wherein oil pressure map 0.5
~0.8MPa, hydraulic pressure set 0.4~0.6MPa, a concentration of the 0.3~0.6% of emulsion；Increase between roughing and finish rolling and protects
Temperature cover or Coil Box, intermediate base head and tail temperature difference≤± 15 DEG C；
7) section cooling；
8) it batches；Coiling temperature is 500~680 DEG C, preferably 540~580 DEG C
9) smooth.
The chemical composition of molten steel and its weight percent see the table below 1 after being refined in Examples 1 to 6；
The main technologic parameters that course of hot rolling is related in Examples 1 to 6 see the table below 2；
The Thin Specs hot rolled plate that embodiment 1 obtains directly carries out hot forming, hot forming front surface typical oxidation iron sheet pattern
See Fig. 1, forming front surface iron scale thickness is 5.0~8.0 μm, and iron sheet is more complete, after hot forming thickness of scale be 8.0~
11.0μm；Hot forming rear surface typical oxidation iron sheet pattern is shown in Fig. 2, hot iron skin it is slightly broken but it is less fall off, do not have to pickling, can
To meet directly hot formed requirement.
Mechanical performance data after the Thin Specs hot rolled plate hot forming that Examples 1 to 6 obtains is shown in Table 3.
Table 1 (wt.%)
Table 2
Table 3
Make from table 3 it can be seen that the Thin Specs hot-rolled steel of the 1.5~3.0mm obtained with Examples 1 to 6 substitutes cold-reduced sheet
For hot forming raw material, obtained hot forming steel yield strength reaches 880MPa or more, and up to 1150 or more, elongation reaches tensile strength
5.0 or more, good mechanical performance.
Claims (10)
1. a kind of direct hot forming thin format hot rolled steel plate, it is characterised in that：The chemical composition and its weight percent of the steel plate
Than as follows：C：0.12~0.50%, Si：0.15~0.65%, Mn：0.70~2.0%, P≤0.015%, S≤0.008%,
Als：0.015~0.06%, N≤0.005%, B≤0.005%, Cr：0.15~0.65%, Nb：0.005~0.060%, or
Ti：0.005~0.06% or V:Two or three of element is mixed with arbitrary proportion in 0.005~0.06% or Nb, Ti and V,
And mixed total weight percent≤0.10%, remaining is iron and inevitable impurity；The manufacturing method of the steel plate, packet
Converter smelting is included, is refined, continuous casting, heating strand, roughing, finish rolling and batches step at section cooling, the heating strand step
In, heating temperature is 1250~1350 DEG C；In the roughing step, the workpiece thickness after roughing is 25~45mm, and roughing removes
Squama temperature >=1170 DEG C；In the finish rolling step, the reduction ratio of two passages is respectively 43~48% and 40~45%, end before finish rolling
Percentage pass reduction is 10~15%, and belt steel thickness is 1.5~3.0mm after finish rolling, and finishing temperature is 850~920 DEG C；It is described to batch
In step, coiling temperature is 500~680 DEG C；
In the roughing step, rough rolling process is 5 or 7 passages；In the finish rolling step, finishing stands be 7 passages, finish rolling first three
Passage uses interstand cooling；In the finish rolling step, using lubrication and rolling, wherein oil pressure is 0.5~0.8MPa, and hydraulic pressure is
0.4~0.6MPa, a concentration of the 0.3~0.6% of emulsion.
2. direct hot forming thin format hot rolled steel plate according to claim 1, it is characterised in that：The steel plate chemistry at
Divide and its weight percent is as follows：C：0.25~0.50%, Si：0.30~0.65%, Mn：1.20~2.0%, P：0.01~
0.015%, S：0.005~0.008%, Als：0.02~0.06%, N:0.004~0.005%, B：0.004~0.005%,
Cr：0.25~0.65%, Nb：0.03~0.060%, Ti：0.02~0.05%, and the mixed total weight percents of Nb and Ti
≤ 0.10%, remaining is iron and inevitable impurity.
3. direct hot forming thin format hot rolled steel plate according to claim 1, it is characterised in that：The steel plate chemistry at
Divide and its weight percent is as follows：C：0.40~0.50%, Si：0.44~0.65%, Mn：1.7~2.0%, P：0.01~
0.015%, S：0.005~0.008%, Als：0.02~0.06%, N:0.004~0.005%, B：0.004~0.005%,
Cr：0.5~0.65%, Nb：0.05~0.060%, Ti：0.02~0.03%, V:0.01~0.02%, and Nb, Ti and V mixing
Total weight percent≤0.10% afterwards, remaining is iron and inevitable impurity.
4. direct hot forming thin format hot rolled steel plate according to claim 1 or 2 or 3, it is characterised in that：The steel plate
Thickness is 1.5~3.0mm.
5. the manufacturing method of direct hot forming thin format hot rolled steel plate according to claim 1, including converter smelting, essence
Refining, continuous casting, heating strand, roughing, finish rolling and batch step at section cooling, it is characterised in that：In the heating strand step,
Heating temperature is 1250~1350 DEG C；In the roughing step, the workpiece thickness after roughing is 25~45mm, roughing de-scaling temperature
>=1170 DEG C of degree；In the finish rolling step, the reduction ratio of two passages is respectively 43~48% and 40~45%, extreme trace before finish rolling
Reduction ratio is 10~15%, and belt steel thickness is 1.5~3.0mm after finish rolling, and finishing temperature is 850~920 DEG C；It is described to batch step
In, coiling temperature is 500~680 DEG C.
6. the manufacturing method of direct hot forming thin format hot rolled steel plate according to claim 5, it is characterised in that：It is described
In continuous casting step, slab thickness is 210~250mm；In the roughing step, rough rolling process is 5 or 7 passages；The finish rolling step
In rapid, finishing stands are 7 passages, and finish rolling previous three passes use interstand cooling.
7. the manufacturing method of direct hot forming thin format hot rolled steel plate according to claim 5 or 6, it is characterised in that：
Increase insulation cover or Coil Box, intermediate base head and tail temperature difference≤± 15 DEG C after roughing between roughing and finish rolling.
8. the manufacturing method of direct hot forming thin format hot rolled steel plate according to claim 5 or 6, it is characterised in that：
In the finish rolling step, using lubrication and rolling, wherein oil pressure is 0.5~0.8MPa, and hydraulic pressure is 0.4~0.6MPa, emulsion
A concentration of 0.3~0.6%.
9. the manufacturing method of direct hot forming thin format hot rolled steel plate according to claim 5 or 6, it is characterised in that：
In the finish rolling step, finishing temperature is 880~920 DEG C.
10. the manufacturing method of direct hot forming thin format hot rolled steel plate according to claim 5 or 6, it is characterised in that：
Described to batch in step, coiling temperature is 540~580 DEG C.
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| CN107641759B (en) * | 2017-09-13 | 2021-08-13 | 武汉钢铁有限公司 | Method for producing thin-specification hot forming steel based on CSP (cast Steel plate) process |
| CN108754319B (en) * | 2018-06-08 | 2020-08-04 | 武汉钢铁有限公司 | Hot forming steel with tensile strength of more than or equal to 1800MPa produced by ESP production line and method |
| CN109266965A (en) * | 2018-11-01 | 2019-01-25 | 宁波钢铁有限公司 | A kind of hot rolled strip and its preparation and application |
| CN111088460B (en) * | 2019-12-31 | 2021-08-17 | 河钢股份有限公司承德分公司 | Medium-high carbon steel 40MnCr hot-rolled pickled plate and production method thereof |
| CN111266406B (en) * | 2020-03-02 | 2022-01-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Rolling method of ultrathin hot continuous rolling steel strip |
| CN111411298B (en) * | 2020-03-31 | 2022-04-26 | 首钢京唐钢铁联合有限责任公司 | Low-strength iron sheet falling-resistant hot-formed steel coil and preparation method thereof |
| CN111826588A (en) * | 2020-06-30 | 2020-10-27 | 张家港扬子江冷轧板有限公司 | Hard-rolled high-strength strip steel and preparation method thereof |
| CN114012056B (en) * | 2021-10-14 | 2023-10-13 | 首钢集团有限公司 | 1500 MPa-level hot forming steel and preparation method thereof |
| CN115627423B (en) * | 2022-11-01 | 2024-02-02 | 本钢板材股份有限公司 | 1600 MPa-grade hot rolled coil and production method thereof |
| CN116837296B (en) * | 2023-08-22 | 2024-06-18 | 北京理工大学重庆创新中心 | Preparation method and application of anti-oxidation hot forming steel suitable for thick specification |
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| JP4325277B2 (en) * | 2003-05-28 | 2009-09-02 | 住友金属工業株式会社 | Hot forming method and hot forming parts |
| CN101275200A (en) * | 2008-05-21 | 2008-10-01 | 钢铁研究总院 | Hotforming martensitic steel |
| CN102031456B (en) * | 2009-09-30 | 2013-07-03 | 鞍钢股份有限公司 | Steel sheet for press hardening and method of hot forming the same |
| CN102260824A (en) * | 2010-05-25 | 2011-11-30 | 宝山钢铁股份有限公司 | Hot-rolled steel plate with yield strength of 550 MPa for hot forming and manufacturing method thereof |
| CA2865910C (en) * | 2012-03-07 | 2017-10-17 | Nippon Steel & Sumitomo Metal Corporation | Steel sheet for hot stamping, method for production thereof, and hot stamping steel material |
| KR101753016B1 (en) * | 2013-09-18 | 2017-07-03 | 신닛테츠스미킨 카부시키카이샤 | Hot stamp molded body and method for producing same |
| CN105220073B (en) * | 2014-06-09 | 2017-09-15 | 鞍钢股份有限公司 | Hot-rolled strip steel for rake blades, production method and rake blade treatment method |
| CN106086624B (en) * | 2016-07-13 | 2017-11-24 | 唐山钢铁集团有限责任公司 | A kind of heat stamping and shaping hot rolled strip and its production method |
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