CN105018838B - Large, thick, high-strength and high-toughness TMCP type steel plate and production method thereof - Google Patents
Large, thick, high-strength and high-toughness TMCP type steel plate and production method thereof Download PDFInfo
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Abstract
The invention discloses a large, thick, high-strength and high-toughness TMCP type steel plate and a production method thereof. The large, thick, high-strength and high-toughness TMCP type steel plate is composed of, by weight, 0.06%-0.08% of C, 0.20%-0.40% of Si, 1.40%-1.50% of Mn, 0.015% or less of P, 0.005% or less of S, 0.020-0.030% of Nb, 0.030%-0.050% of Alt, the balance Fe and inevitable impurities and 0.20% or less of Pcm. According to the steel plate, the components are simple, only a proper amount of microalloy Nb is added, and the precious elements such as V, Ti and Ni are not added; production cost is low, and the probability of large-scale production is increased. The steel plate is of a mixed structure mainly containing bainite, ferrite, pearlite and martensite and has a good comprehensive mechanical property; the steel plate is better in matching of the components and the strength and toughness, and it is guaranteed that the steel plate has the excellent comprehensive mechanical property; particularly, the impact performance of half of the plate in the thickness direction is good at the low temperature of minus 40 DEG C, and the method can be widely used for producing low-temperature-resistant building steel and engineering steel used in extremely cold climate. The method has the advantages that the production cost is low, and the technique is simple; the performance of products is excellent, and the comprehensive mechanical property of the products is stable.
Description
Technical field
The present invention relates to a kind of high-strength tenacity steel plate and its production method, the especially a kind of big thick and high-strength toughness of TMCP types
Steel plate and its production method.
Background technology
With the quick upgrading of Domestic Plate equipment, on the premise of mechanical property of steel plate is ensured, constantly reduce
Cost, optimize technique, improve production efficiency, meanwhile, TMCP rolling techniques have obtained wider application, thick in substantial amounts of TMCP
Panel products and production technology are developed and apply, and meet increasingly increasing to TMCP types big thickness low alloy steel plates on market
Demand, many steel mills have successfully developed TMCP both at home and abroad at present（Or TMCP+ tempering）For the low-alloy high-strength of the main condition of delivery
Product made from steel, successfully substitutes the Technologies for Heating Processing such as quenched, normalizing, greatly reduces production cost.
The Chinese patent of Publication No. CN102330020A discloses a kind of yield strength for 345~390MPa high-ductility steels
The manufacture method of plate, which adopts controlled rolling air cooling technique+normalized treatment, and it is micro- that substantial amounts of Nb, V, Ti etc. are with the addition of on composition
Alloying element, the maximum gauge specification of production to 100mm.But, the specification of the method complex process, high cost and production is not
Greatly.
The Chinese patent application of Publication No. CN101514424A disclose a kind of TMCP types ocean structure slab and its
Manufacture method, its based on low C, high Mn, by adding the microalloy elements such as micro Nb, Ti, with reference to TMCP rolling mill practice controls
System, designs D40, E40 level marine steel plate of maximum gauge 100mm.Add on the slab composition except various micro- conjunctions such as Nb
Gold dollar usually improves stabilization of austenite and cryogenic property；But, the C content of design works as C in the scope of 0.015~0.18wt%
Require in below 0.05wt%, in the smelting process of ultralow C steel, generally will increase the residual oxygen of VD before the refine after just refining and take off
The step of carbon, this not only increases smelting cost and also extends the duration of heat.
The Chinese patent application of Publication No. CN103882297A discloses a kind of with excellent toughness 390MPa grade low-temps
Hull steel and its manufacture method, which adopts complicated microalloy element Nb, Ti complex intensifying mechanism on composition, relatively costly；
During rolling control is cold, using different cooling rates, i.e., cooling rate is first adopted for the ultra-rapid cooling more than 30 DEG C/S, subsequently into cold
Speed is the section cooling more than 10 DEG C/S, returns red to 580 DEG C~640 DEG C, during this requires the operation of rolling, the ginseng of constantly regulate milling train
Number, is precisely controlled matching for rolling temperature and the water yield, higher to rolling mill practice requirement.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of big thick and high-strength flexible steel plate of TMCP types of low cost；This
A kind of production method of the big thick and high-strength flexible steel plate of bright TMCP types for additionally providing process is simple.
To solve above-mentioned technical problem, the present invention is by following weight percent into being grouped into：C 0.06%~0.08%,
Si 0.20%~0.40%, Mn 1.40%~1.50%, P≤0.015%, S≤0.005%, Nb 0.020%~0.030%, Alt
0.030%~0.050%, balance of Fe and inevitable impurity, welding crack sensibility indices P cm≤0.20%.
The maximum gauge of steel plate of the present invention is 110mm.
On the basis of low-carbon (LC), single plus appropriate microalloy element Nb is not affected the present invention by other microalloy elements, other
Microalloy element is not additionally added, and is existed on a small quantity and is then considered remaining.It is main to consider it is to add Nb elements to be modern scientist rolling
The needs of technique, the element can be combined into carbide, nitride and carboritride in steel with C, N, and these compounds have
Dissolve during high temperature, the characteristics of precipitation during low temperature, therefore original austenite grain can be hindered in heating steel billet to grow up, rolled
Crystal grain after suppressing recrystallization in journey and recrystallizing is grown up, and precipitation strength effect is played in low temperature.
The inventive method includes smelting, continuous casting, heating, TMCP rollings and cooling procedure；Continuous casting obtained by the casting process
Base is as described above into being grouped into by following weight percent；
The TMCP operations of rolling：Using II stage rollings；I stage rolling temperature is 1000 DEG C~1150 DEG C；The II stages
Start rolling temperature be 840 DEG C~860 DEG C, finishing temperature be 800 DEG C~820 DEG C.
The TMCP operations of rolling described in the inventive method：In I stage, single pass reduction ratio >=20%, it is 70% to add up reduction ratio
~80%, the steel thickness that dries in the air is 1.5T~2.5T, and T is the mm of thickness of finished product（Steel plate thickness i.e. after II stage rollings）；The II stages
In, single pass reduction ratio >=10%；The total road secondary control of rolling in two stages is in 10~16 passages.
Heating process described in the inventive method：Heating-up temperature is 1220 DEG C~1240 DEG C, 9~11min/cm of heating coefficient,
Soaking zone time inside furnace >=50min.
Cooling procedure described in the inventive method：Cooled down using ACC, rate of cooling is 4 DEG C/s~8 DEG C/s, and upper and lower water is than control
Make 1:1.1~1:1.80,500 DEG C~550 DEG C of steel plate red temperature.
Casting process described in the inventive method：It is obtained with 10 DEG C~25 DEG C of the degree of superheat, 0.8~1.0m/min pulling speed of continuous casting
Continuous casting billet.The continuous casting billet specification is 300mm*2400mm.
The principle of the inventive method is：（1）The present invention can significantly improve austenite recrystallization temperature, here temperature using Nb
Degree interval carries out big single pass deformation, with the deformation-induced precipitation of the carbonitride of Nb, hinders austenite reversion and ties again
Crystalline substance, so as to effective fining austenite grains.Multi-pass accumulated deformation is carried out in non-recrystallization zone, and it is laggard in Ar3 or so finish to gauges
Row is strong cold, rolls rear relaxation precipitation and controls the measure such as cold and plays the effect such as solution strengthening, dislocation strengthening, precipitation strength, crystal grain thinning,
Substantially increase the intensity and toughness of material.
（2）Further, for the micro alloyed steel containing niobium, it is contemplated that the solid solution problem of microalloy element Nb, make the analysis of niobium
Go out mutually abundant back dissolving, determine billet heating temperature control in the range of 1220 DEG C~1240 DEG C, 9~11min/cm of heating coefficient.
Using the beneficial effect produced by above-mentioned technical proposal it is：（1）Present component is simple, only adds appropriate micro-
Alloy element Nb, is added without various noble elements such as V, Ti, Ni；Production cost relative moderate, increased the possibility of large-scale production
Property.（2）The present invention is the line and staff control based on bainite, ferrite, pearlite, martensite, with good comprehensive mechanics
Performance.（3）Matching with more preferable composition and obdurability, it is ensured that steel plate has excellent comprehensive mechanical property, particularly-
In a low temperature of 40 DEG C, the impact property of thickness of slab 1/2 preferably, can be widely applied to manufacture the building and work under low temperature resistant pole cold is waited
Journey steel.
Based on low C, single plus microalloy element Nb produces maximum gauge by TMCP rolling mill practices to the inventive method
Up to 110mm and protect 1/2 cryogenic property of thickness of slab high tough steel plate；Steel plate composition cost is reduced, rolling mill practice is simplified；Institute
Steel plate mechanical property not only yield strength >=400MPa, tensile strength >=520MPa, yield tensile ratio≤0.85, elongation percentage >=
20%, and it is many in more than 150J in the ballistic work of -40 DEG C of impact temperature lower steel plate thickness 1/4 and 1/2.Therefore, the inventive method
With low production cost, process is simple, properties of product are excellent, product comprehensive mechanical property is stable the characteristics of.
The inventive method is using conventional rate of cooling（4~8 DEG C/S）, the tune during rolling control is cold to mill data
Section is less demanding, and ultra-rapid cooling more need not be reached using the limit capacity of milling train, and process system is loose, and this is at actual batch
More easy to operate and realization in amount production.
Description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Fig. 1 is 50mm steel plates thickness of slab 1/4 in the embodiment of the present invention 1（500X）Microscopic structure；
Fig. 2 is 50mm steel plates thickness of slab 1/2 in the embodiment of the present invention 1（500X）Microscopic structure；
Fig. 3 is 70mm steel plates thickness of slab 1/4 in the embodiment of the present invention 3（500X）Microscopic structure；
Fig. 4 is 70mm steel plates thickness of slab 1/2 in the embodiment of the present invention 3（500X）Microscopic structure；
Fig. 5 is 80mm steel plates thickness of slab 1/4 in the embodiment of the present invention 4（500X）Microscopic structure；
Fig. 6 is 80mm steel plates thickness of slab 1/2 in the embodiment of the present invention 4（500X）Microscopic structure；
Fig. 7 is 110mm steel plates thickness of slab 1/4 in the embodiment of the present invention 6（500X）Microscopic structure；
Fig. 8 is 110mm steel plates thickness of slab 1/2 in the embodiment of the present invention 6（500X）Microscopic structure.
Specific embodiment
The big thick and high-strength flexible steel plate of this TMCP types adopts following compositions proportioning and production method：Chemical composition proportioning is shown in Table
1, balance of Fe and inevitable impurity.
Table 1：The chemical composition of each embodiment（wt%）
The production method of the big thick and high-strength flexible steel plate of this TMCP types includes：Smelting, continuous casting, heating, TMCP are rolled and cold
But process；In the smelting process, refine whole process Argon adds more than Fe-Ca line 250m before vacuum.Each embodiment is specifically given birth to
Production. art is as described below.
Embodiment 1：By the molten steel after smelting, specification is obtained with 10 DEG C of the degree of superheat, 0.9m/min pulling speed of continuous casting is
The continuous casting billet of 300mm*2400mm；Continuous casting billet after cooling is heated, and heating-up temperature is 1230 DEG C, heating coefficient 10min/
Cm, soaking zone heat time heating time（Time inside furnace）56min.Using II stage rollings, I stage（Perfect recrystallization area）Rolling temperature is
1000 DEG C~1050 DEG C, single pass reduction ratio >=20% adds up reduction ratio 80%, and temperature thickness is treated in centre（Dry in the air steel thickness）120mm；II
Stage（Non- recrystallization zone）845 DEG C~855 DEG C of start rolling temperature, 800 DEG C~820 DEG C of finishing temperature, single pass reduction ratio >=10%,
Total road secondary control is rolled in 16 passages.Cooled down using ACC after rolling, rate of cooling is 6 DEG C/s, and upper and lower water is than controlling 1:1.50,
520 DEG C~540 DEG C of steel plate red temperature；TMCP type high-strength tenacity steel plate that thickness specification be 50mm is obtained after cooling.
Embodiment 2：By the molten steel after smelting, specification is obtained with 18 DEG C of the degree of superheat, 0.9m/min pulling speed of continuous casting is
The continuous casting billet of 300mm*2400mm；Continuous casting billet after cooling is heated, and heating-up temperature is 1240 DEG C, heating coefficient 10min/
Cm, soaking zone heat time heating time（Time inside furnace）50min.Using II stage rollings, I stage rolling temperature is 1050 DEG C~1100
DEG C, single pass reduction ratio >=20% adds up reduction ratio 74%, and temperature thickness 150mm is treated in centre；The II stages（Non- recrystallization zone）Open rolling temperature
845 DEG C~855 DEG C of degree, 800 DEG C~810 DEG C of finishing temperature, single pass reduction ratio >=10% roll total road secondary control in 13 passages.
Cooled down using ACC after rolling, rate of cooling is 5 DEG C/s, and upper and lower water is than controlling 1:1.10, steel plate red temperature 520 DEG C~540
℃；TMCP type high-strength tenacity steel plate that thickness specification be 60mm is obtained after cooling.
Embodiment 3：By the molten steel after smelting, specification is obtained with 20 DEG C of the degree of superheat, 0.8m/min pulling speed of continuous casting is
The continuous casting billet of 300mm*2400mm；Continuous casting billet after cooling is heated, and heating-up temperature is 1235 DEG C, heating coefficient 10min/
Cm, soaking zone heat time heating time（Time inside furnace）70min.Using II stage rollings, I stage（Perfect recrystallization area）Rolling temperature is
1040 DEG C~1080 DEG C, single pass reduction ratio >=20% adds up reduction ratio 77%, and temperature thickness is treated in centre（Dry in the air steel thickness）130mm；II
Stage（Non- recrystallization zone）850 DEG C~860 DEG C of start rolling temperature, 800 DEG C~820 DEG C of finishing temperature, single pass reduction ratio >=12%,
Total road secondary control is rolled in 14 passages.Cooled down using ACC after rolling, rate of cooling is 7 DEG C/s, and upper and lower water is than controlling 1:1.50,
520 DEG C~550 DEG C of steel plate red temperature；TMCP type high-strength tenacity steel plate that thickness specification be 70mm is obtained after cooling.
Embodiment 4：By the molten steel after smelting, specification is obtained with 15 DEG C of the degree of superheat, 0.9m/min pulling speed of continuous casting is
The continuous casting billet of 300mm*2400mm；Continuous casting billet after cooling is heated, and heating-up temperature is 1235 DEG C, heating coefficient 11min/
Cm, soaking zone heat time heating time（Time inside furnace）70min.Using II stage rollings, I stage rolling temperature is 1040 DEG C~1080
DEG C, single pass reduction ratio >=20% adds up reduction ratio 75%, and temperature thickness 140mm is treated in centre；The II stages（Non- recrystallization zone）Open rolling temperature
850 DEG C~860 DEG C of degree, 800 DEG C~820 DEG C of finishing temperature, single pass reduction ratio >=15% roll total road secondary control in 14 passages.
Cooled down using ACC after rolling, rate of cooling is 7 DEG C/s, and upper and lower water is than controlling 1:1.60, steel plate red temperature 510 DEG C~540
℃；TMCP type high-strength tenacity steel plate that thickness specification be 80mm is obtained after cooling.
Embodiment 5：By the molten steel after smelting, specification is obtained with 17 DEG C of the degree of superheat, 1.0m/min pulling speed of continuous casting is
The continuous casting billet of 300mm*2400mm；Continuous casting billet after cooling is heated, and heating-up temperature is 1220 DEG C, heating coefficient 10min/
Cm, soaking zone heat time heating time（Time inside furnace）90min.Using II stage rollings, I stage rolling temperature is 1070 DEG C~1120
DEG C, single pass reduction ratio >=22% adds up reduction ratio 73%, and temperature thickness 200mm is treated in centre；The II stages（Non- recrystallization zone）Open rolling temperature
840 DEG C~850 DEG C of degree, 810 DEG C~820 DEG C of finishing temperature, single pass reduction ratio >=12% roll total road secondary control in 12 passages.
Cooled down using ACC after rolling, rate of cooling is 4 DEG C/s, and upper and lower water is than controlling 1:1.30, steel plate red temperature 510 DEG C~530
℃；TMCP type high-strength tenacity steel plate that thickness specification be 100mm is obtained after cooling.
Embodiment 6：By the molten steel after smelting, specification is obtained with 25 DEG C of the degree of superheat, 0.9m/min pulling speed of continuous casting is
The continuous casting billet of 300mm*2400mm；Continuous casting billet after cooling is heated, and heating-up temperature is 1238 DEG C, heating coefficient 9min/cm,
Soaking zone heat time heating time（Time inside furnace）85min.Using II stage rollings, I stage rolling temperature is 1100 DEG C~1150 DEG C, single
Percentage pass reduction >=20%, adds up reduction ratio 70%, and temperature thickness 165mm is treated in centre；The II stages（Non- recrystallization zone）Start rolling temperature 850
DEG C~860 DEG C, 800 DEG C~810 DEG C of finishing temperature, single pass reduction ratio >=10% roll total road secondary control in 10 passages.After rolling
Cooled down using ACC, rate of cooling is 8 DEG C/s, and upper and lower water is than controlling 1:1.80,500 DEG C~540 DEG C of steel plate red temperature；It is cold
But the TMCP type high-strength tenacity steel plates that thickness specification is 110mm are obtained afterwards.
Steel plate obtained by the various embodiments described above carries out mechanical properties test, and the mechanical property for obtaining is shown in Table 2.
Table 2：The mechanical property of each embodiment steel plate
The plate property produced by this method is can be seen that by the mechanical properties test result of table 2 excellent；Gained steel
The mechanical property of plate not only yield strength >=400MPa, tensile strength >=520MPa, yield tensile ratio≤0.85, elongation percentage >=20%, and
And it is many in more than 150J in the ballistic work of -40 DEG C of impact temperature lower steel plate thickness 1/4 and 1/2.
The thickness of slab 1/4 and 1/2 of 1,3,4 and 6 gained steel plate of embodiment（500X）Microscopic structure see Fig. 1~Fig. 8.Such as Fig. 1
Shown in~Fig. 8, using TMCP techniques, passage deformation when recrystallization zone is rolled can penetrate into whole thickness direction, austenite crystal
Grain is fully crushed, and crystal grain is sufficiently flattened, and is conducive to crystal grain refinement；Steel plate under each rolling mill practice is without obvious band
Shape is organized, and is all with bainite（Granular bainite or ferrite bainite）, ferrite, pearlite, the mixing group based on martensite
Knit, except for the difference that the ratio in every group of photo shared by each phase constitution is different；Steel plate while higher-strength is possessed, also with compared with
Good moulding and toughness, comprehensive mechanical performance are preferable.
The invention is not limited in above-described embodiment, according to the present invention provide component requirements and manufacturing technique requirent,
Can implement.
Claims (2)
1. the production method of the big thick and high-strength flexible steel plate of a kind of TMCP types, it is characterised in that：It include smelting, continuous casting, heating,
TMCP is rolled and cooling procedure；Continuous casting billet obtained by the casting process is by following weight percent into being grouped into：C 0.06%
~0.08%, Si 0.20%~0.40%, Mn 1.40%~1.50%, P≤0.015%, S≤0.005%, Nb 0.020%~
0.030%, Alt 0.030%~0.050%, balance of Fe and inevitable impurity, Pcm≤0.20%, the maximum of the steel plate
Thickness is 110mm；
The TMCP operations of rolling：Using II stage rollings；I stage rolling temperature is 1000 DEG C~1150 DEG C, single pass pressure
Rate >=20%, it is 70%~80% to add up reduction ratio, and the steel thickness that dries in the air is 1.5T~2.5T, and T is the mm of thickness of finished product；The II stages
Start rolling temperature is 840 DEG C~860 DEG C, and finishing temperature is 800 DEG C~820 DEG C, single pass reduction ratio >=10%；Two stages roll
Zhi Zong roads secondary control is in 10~16 passages；
The casting process：Continuous casting billet is obtained with the pulling speed of continuous casting of 10 DEG C~25 DEG C of the degree of superheat, 0.8~1.0m/min；
The heating process：Heating-up temperature is 1220 DEG C~1240 DEG C, 9~11min/cm of heating coefficient, soaking zone time inside furnace
≥50min；
The cooling procedure：Cooled down using ACC, rate of cooling is 4 DEG C/s~8 DEG C/s, and upper and lower water is than controlling 1:1.1~1:
1.8,500 DEG C~550 DEG C of steel plate red temperature.
2. the production method of the big thick and high-strength flexible steel plate of TMCP types according to claim 1, it is characterised in that：The company
Casting blank specification is 300mm*2400mm.
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| CN109055868B (en) * | 2018-10-10 | 2020-02-18 | 鞍钢股份有限公司 | Production method of X80 thick ultra-wide longitudinal submerged arc welding pipeline steel |
| CN110423938A (en) * | 2019-07-24 | 2019-11-08 | 舞阳钢铁有限责任公司 | TMCP type surrenders 500MPa level structure steel plate and its production method |
| CN112795839A (en) * | 2020-12-15 | 2021-05-14 | 舞阳钢铁有限责任公司 | Large-thickness ultralow-temperature high-toughness steel plate for spherical tank and rolling method thereof |
| CN114134404B (en) * | 2021-05-20 | 2022-07-29 | 江阴兴澄特种钢铁有限公司 | Economical FH36 steel plate for icebreaking ship and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6293313A (en) * | 1985-10-21 | 1987-04-28 | Kobe Steel Ltd | Manufacture of accerelatedly cooled steel sheet superior in stress relief annealing characteristic |
| JP2008261030A (en) * | 2007-04-13 | 2008-10-30 | Nippon Steel Corp | Method of manufacturing thick high-strength steel plate excellent in brittle crack propagation stopping characteristic |
| CN102277529A (en) * | 2011-07-28 | 2011-12-14 | 莱芜钢铁集团有限公司 | High-strength high-tenacity ship plate steel and TMCP (Thermal Mechanical Control Process) production technology method thereof |
| CN102286701A (en) * | 2011-05-12 | 2011-12-21 | 南京钢铁股份有限公司 | Thick plate for ultra-high-intensity boat body structure and production method thereof |
| CN104357742A (en) * | 2014-11-10 | 2015-02-18 | 舞阳钢铁有限责任公司 | 420MPa high-thickness hot-rolled steel sheet for ocean engineering and production method thereof |
-
2015
- 2015-07-23 CN CN201510435434.9A patent/CN105018838B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6293313A (en) * | 1985-10-21 | 1987-04-28 | Kobe Steel Ltd | Manufacture of accerelatedly cooled steel sheet superior in stress relief annealing characteristic |
| JP2008261030A (en) * | 2007-04-13 | 2008-10-30 | Nippon Steel Corp | Method of manufacturing thick high-strength steel plate excellent in brittle crack propagation stopping characteristic |
| CN102286701A (en) * | 2011-05-12 | 2011-12-21 | 南京钢铁股份有限公司 | Thick plate for ultra-high-intensity boat body structure and production method thereof |
| CN102277529A (en) * | 2011-07-28 | 2011-12-14 | 莱芜钢铁集团有限公司 | High-strength high-tenacity ship plate steel and TMCP (Thermal Mechanical Control Process) production technology method thereof |
| CN104357742A (en) * | 2014-11-10 | 2015-02-18 | 舞阳钢铁有限责任公司 | 420MPa high-thickness hot-rolled steel sheet for ocean engineering and production method thereof |
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