CN108251623A - A kind of preparation method based on TMCP process improving super-thick steel plate toughness and tenacities - Google Patents
A kind of preparation method based on TMCP process improving super-thick steel plate toughness and tenacities Download PDFInfo
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- CN108251623A CN108251623A CN201810042932.0A CN201810042932A CN108251623A CN 108251623 A CN108251623 A CN 108251623A CN 201810042932 A CN201810042932 A CN 201810042932A CN 108251623 A CN108251623 A CN 108251623A
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- 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
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- Heat Treatment Of Steel (AREA)
Abstract
The present invention relates to a kind of preparation method based on TMCP process improving super-thick steel plate toughness and tenacities, the continuous casting billet that ingredient is reached to requirement reheats, and then directly produces qualified products by cooling controlling and rolling controlling process.Consider the reasonably combined of toughness and tenacity in terms of rolling, cooling regulation optimization, fully refinement original austenite grains size, increase austenite deformation accumulation, tissue proportions constant etc. is ensured using rational cooling system, fully demonstrate the technology potentiality of modern material processing, play the effect that the phase transformations control process means such as controlled rolling, control cooling promote steel Strengthening and Toughening, it is ensured that using the special thick steel product high-fracture toughness of the low-alloy of TMCP technique productions.This method has the characteristics that low cost, short route, high-precision, technique are simplified, is easy to industrial mass production.
Description
Technical field
The invention belongs to steel plate preparation fields, and in particular to a kind of based on TMCP process improving super-thick steel plate toughness and tenacities
Preparation method.
Background technology
In recent years, as the exploitation of marine resources, marine engineering equipment are transported and developed to enlargement direction, knot is promoted
The high intensity and thicker of structure material, from the perspective of ensuring integrally-built safety, preventing brittle break, with greater need for
Steel have higher destruction toughness value, high fracture toughening, accordingly even when there is brittle crack, can also stop its propagation, it is ensured that
The safety of structure member.
The method of common improvement steel plate toughness and tenacity, mainly by the method for crystal grain refinement, crystal grain refinement is unique
A kind of intensity for not only having improved steel but also the method for improving toughness.The crystal grain refinement of whole realization steel is formed using the big soft reduction process of low temperature
A large amount of Zona transformans so as to provide more nucleation points for structural transformation, and are realized by subsequent control cooling and require phase transformation, tissue
Refinement, this common technology obtains practical application in the production of the relatively thin gauge steels of 20-40mm.The production of more think gauge
When, if still proposing requirements at the higher level to mill capacity using the big soft reduction process of low temperature, otherwise deformation is difficult to penetrate into center portion, is made
It is uneven into thickness directional properties.It is more to be given birth to using heat treatment process for think gauge product for proof strength and toughness
The production of the good fine-grained steel of toughness is realized in production by quenching add-back ignition technique.
It is " the thick steel of 500MPa grades of offshore platform structures of yield strength application No. is 201110056854.8, patent name
The patent of plate and manufacturing method " discloses a kind of uneven to solve high-level offshore platform steel thickness direction microscopic structure
Even, the problems such as center portion low-temperature impact toughness is insufficient, coordinates 10-13 DEG C/s cooldown rates to be cooled to 500-600 DEG C, again using after controlled rolling
It achieves the goal with reference to two-phase section quenching and high tempering.It, which quenches add-back ignition technique, exists again cooling technique after controlled rolling early period
There are technique waste, complex procedures in the defects of invigoration effect is offset, organization type is a kind of high tempering of bainite
Tissue.
Application No. is 201110341100.7, patent name for " a kind of 80mm thickness low compression ratio steel plate for ocean engineering and
The patent of its manufacturing method ", by the way of controlled rolling and controlled cooling method and then normalized treatment, the maximum gauge of manufacture is 80mm steel
Plate has the characteristics that the anti-lamellar tearing performance of high intensity, good Z-direction and high-ductility.This controlled rolling and controlled cooling+normalized treatment technique life
The defects of special heavy plate of production can offset the invigoration effect of controlled rolling early period cooling technique there is also normalizing process exists apparent
Technique wasting phenomenon, necessarily causes cost to remain high.
It is " the high super-thick steel plate of intensity high and low temperature toughness and its production application No. is 201110060060.9, patent name
The patent of method ", using the controlled rolling process production yield strength 390MPa of 40-100mm, tensile strength be more than 490MPa, ensure-
40 DEG C of low-temperature flexibilities reach the special heavy plate of 100J.The technology low intensive low-alloy steel, the deck of boat production in using more general
And it but is difficult to meet higher intensity rank, proposes to prevent the requirement of the high-performance steel of crack propagation requirement.
To sum up, there are process is long, the reality such as need matching special equipment, energy consumption big for heat treatment process production special heavy plate
Problem, complicated process links need handling back and forth, processing, and production efficiency is low, required production site is larger, production cost occupies
It is high not under, there is an urgent need to develop the super-thick steel plate productive technology of short flow that a kind of toughness and tenacity is excellent.
Invention content
The purpose of the present invention is to provide a kind of production product steel performance uniformly, obdurability surplus capacity is big, fracture is tough
Property improve, of low cost, technique is simplified, be easy to industrial mass production based on TMCP process improving super-thick steel plate obdurabilities
The preparation method of energy.
The technical solution adopted by the present invention to solve the technical problems is：One kind is strong based on TMCP process improving super-thick steel plates
The preparation method of tough performance, includes the following steps：
A) the 250-300mm continuous casting billets that ingredient is reached to requirement re-start heating, and heating temperature is 1150-1200 DEG C,
Heating time is 9-11min/cm；
B) continuous casting billet milling is into semi-finished product：A start rolling temperature of the continuous cast rectangle billet through rough rolling step after heating be
1080-1130 DEG C, interval rolling temperature is controlled in 950-980 DEG C of section；
C) semi-finished product are sent into finishing mill, the accurate rolling procedure for controlling the finish rolling stage, 780-820 DEG C of finishing temperature；
D) rear the beginning of cooling temperature of steel plate is rolled more than 760 DEG C, and secondary cooling starts control in ferritic phase height
Ar3-30~60 DEG C range, final cooling temperature are controlled at 350-400 DEG C.
Specifically, the mill speed of rough rolling step is controlled in 0.5-2m/s in the step b).
Specifically, in the step b) in 950-980 DEG C of interval rolling temperature range, pass deformation rate is controlled 15%
More than, passage interval time was controlled at 30-90 seconds.
Specifically, each stage sotck thinkness meets condition in the step b)：If thickness of strand is H, blank thickness
For h, sotck thinkness is h1 when interval rolling starts, then meets condition H/h >=2, H/h1 >=1.5. between three
Specifically, Whole Process Control passage interval time in finish rolling stage is less than 20 seconds in the step c).
Specifically, in 2-5 DEG C/s, secondary cooling rate is more than 18 DEG C/s for a cooldown rate control in the step d).
The invention has the advantages that：
(1) optimization rolling procedure realizes the fine of prior austenite body tissue, gives full play to the original austenite of refinement to disconnected
Split the raising of toughness and the great influence effect of ductile-brittle transition temperature：Having fully considered influences the factor of special heavy plate effect of rolling：
Deformation temperature, single pass rolling reduction, passage interval time and mill speed are to the affecting laws of recrystallization, on this basis, body
Existing improvement of the heavy reduction rate low speed rolling technique to core structure；Critical-temperature more than recrystallization final temperature (is intermittently rolled
Temperature range processed) when improve deflection and passage interval time, fully ensuring that can also realize what is recrystallized repeatedly during critical-temperature
Condition so that the equiaxial austenite after the big pressure stage recrystallization of high temperature once rolled continues fully refinement, reaches control
The purpose of austenite grain size.Not only embody pressure of the high temperature rolling stage recrystallization softening to thickness of steel product direction
It closes, deformation osmosis, improves the performance uniformity of steel whole thickness section, while pass through interval rolling sequence temperature, pressure
Recrystallization softening is realized in lower rate and the cooperation of passage interval time, realizes the heredity of Austenite Grain Refinement.
(2) the high energy storage of austenite structure before phase change is realized using Large strain accumulation rolling mode：Lead in the finish rolling stage
It crosses and suitable control is carried out to passage interval time, if having enough road minor tick stops when preventing deformation accumulation to a certain extent
Between, high energy low-temperature deformation austenite structure is still able to that Static Recrystallization occurs and consumes kinetic energy, so as to maintain close-to-critical range
The degree of non-recrystallization strain accumulation realizes that austenite structure lays in a large amount of deformation energys before phase change, and power is provided for last phase transformation
Condition.
(3) pass through the variation in the cooperation On-line Control phase transition process of suitable acceleration cooldown rate and temperature, guarantee group
Knit the middle constancy for obtaining soft or hard phase constitution type and ratio：Phase transformation is started, end temp control ensures to obtain high temperature, medium temperature
The suitable morphology of transmutation product ensures that soft or hard Phase Proportion is constant in tissue, plays crack initiation work(of the soft phase in raising impact process, with
And the effect of crack expansion power, realize high-fracture toughness performance；Proportions constant determines the homogeneous deformation of its stress-strain behavior
Feature, ensure tissue, performance uniformity and low yield strength ratio, safety is ensured by component entirety uniform stressed.
(4) suitable heating, rolling, the cooperation of cooling temperature control technology, both ensured the solid solution again of microalloy element with
The temperature requirement of precipitation, and to thick, smart rolling sequence controlled rolling temperature, deflection, mill speed, the reasonable distribution of passage time,
While reducing the degree of dependence to milling train, the effect of region plays intensive control rolling is being recrystallized so that big thickness steel
Obtain excellent performance and geomery.
Therefore the invention improves the technology of special thick steel product toughness and tenacity, and steel Direct Rolling is become a useful person, changed
Prior heat treatment production technology is become；Properties of product using thickness up to the 85mm of this technology production are uniform；It is original to create refinement
Austenite grain size increases austenite deformation accumulation, ensures the practicalities such as tissue proportions constant using rational cooling system
TMCP process control technologies；The formulation of technique is unique, the product steel performance of production uniformly, obdurability surplus capacity it is big,
Fracture toughness improves, and develops low cost, short route manufacturing technology, realizes that the high strength steel of complicated fault toughness reguirements directly rolls
Material technological break-through is made.Cost is not only greatly reduced, improves production efficiency, and mass production can be met well
It is required that.
Description of the drawings
Fig. 1 is the metallographic structure figure of the steel plate prepared in embodiment 1.
Fig. 2 is the metallographic structure figure of the steel plate prepared in embodiment 2.
Specific embodiment
The following is specific embodiments of the present invention, and technical scheme of the present invention is described further, but the present invention
Protection domain is not limited to these embodiments.It is every to be included in the present invention without departing substantially from the change of present inventive concept or equivalent substitute
Protection domain within.
A kind of preparation method based on TMCP process improving super-thick steel plate toughness and tenacities, includes the following steps：
A) the 250-300mm continuous casting billets that ingredient is reached to requirement re-start heating, and heating temperature is 1150-1200 DEG C,
Heating time is 9-11min/cm；
B) continuous casting billet milling is into semi-finished product：A start rolling temperature of the continuous cast rectangle billet through rough rolling step after heating be
1080-1130 DEG C, interval rolling temperature is controlled in 950-980 DEG C of section；
C) semi-finished product are sent into finishing mill, the accurate rolling procedure for controlling the finish rolling stage, 780-820 DEG C of finishing temperature；
D) rear the beginning of cooling temperature of steel plate is rolled more than 760 DEG C, and secondary cooling starts control in ferritic phase height
Ar3-30~60 DEG C range, final cooling temperature are controlled at 350-400 DEG C.
Specifically, the mill speed of rough rolling step is controlled in 0.5-2m/s in the step b).
Specifically, in the step b) in 950-980 DEG C of interval rolling temperature range, pass deformation rate is controlled 15%
More than, passage interval time was controlled at 30-90 seconds.
Specifically, each stage sotck thinkness meets condition in the step b)：If thickness of strand is H, blank thickness
For h, sotck thinkness is h1 when interval rolling starts, then meets condition H/h >=2, H/h1 >=1.5. between three
Specifically, Whole Process Control passage interval time in finish rolling stage is less than 20 seconds in the step c).
Specifically, in 2-5 DEG C/s, secondary cooling rate is more than 18 DEG C/s for a cooldown rate control in the step d).
Embodiment 1
The 250mm continuous casting billets that ingredient is reached to requirement are reheated to 1150 DEG C, time inside furnace 4 hours.Enter after coming out of the stove
Roughing mill carries out first stage high temperature rolling, and 1100 DEG C of open rollings, mill speed control is in 1.5-1.8m/s, multi-pass axial rolling, exhibition
After the wide width dimensions to requirement, when rolled piece thickness drops to 160mm, steel rolling rhythm is controlled, is started when temperature drops to 960 DEG C
Interval rolls, and the semi-finished product of 114mm are rolled into two passages, wherein the interval time of control passes is 30 seconds or more；It is sent into
Finishing mill is quickly rolled into 60mm steel plates, and 15 seconds passage interval times terminated final rolling at 810 DEG C.After rolling 790 DEG C start with
When 3 DEG C/s cooling rates are as cold as Ar3-40 DEG C, it is cooled to 400 DEG C with 20 DEG C/s rapid cooling rates.Then being air-cooled to room temperature is made steel plate.
Embodiment 2
The 300mm continuous casting billets that ingredient is reached to requirement are reheated to 1200 DEG C, time inside furnace 5 hours.Enter after coming out of the stove
Roughing mill carries out first stage high temperature rolling, and 1120 DEG C of open rollings, mill speed control is in 0.7-1.2m/s, multi-pass axial rolling, exhibition
After the wide width dimensions to requirement, when rolled piece thickness drops to 195mm, steel rolling rhythm is controlled, is started when temperature drops to 980 DEG C
Interval rolls, and the semi-finished product of 140mm are rolled into two passages, wherein the interval time of control passes is 70 seconds or more；It is sent into
Finishing mill is quickly rolled into 80mm steel plates, and 10 seconds passage interval times ensured to terminate final rolling at 790 DEG C.It is opened for 770 DEG C after rolling
When beginning is as cold as Ar3-50 DEG C with 5 DEG C/s cooling rates, it is cooled to 350 DEG C with 30 DEG C/s rapid cooling rates.Then being air-cooled to room temperature is made steel plate.
600Mpa steel is more than to the tensile strength that embodiment obtains and carries out mechanical properties test, embodiment 1 and embodiment 2 are made
Standby properties of product effect is shown in Table 1, and metallographic structure figure is shown in Fig. 1 and Fig. 2 respectively.
1 embodiment 1 of table and the properties of product of embodiment 2 control
Claims (6)
1. a kind of preparation method based on TMCP process improving super-thick steel plate toughness and tenacities, which is characterized in that include the following steps：
A) the 250-300mm continuous casting billets that ingredient is reached to requirement re-start heating, and heating temperature is 1150-1200 DEG C, heating
Time is 9-11min/cm；
B) continuous casting billet milling is into semi-finished product：A start rolling temperature of the continuous cast rectangle billet through rough rolling step after heating is 1080-
1130 DEG C, interval rolling temperature is controlled in 950-980 DEG C of section；
C) semi-finished product are sent into finishing mill, the accurate rolling procedure for controlling the finish rolling stage, 780-820 DEG C of finishing temperature；
D) rear the beginning of cooling temperature of steel plate is rolled more than 760 DEG C, and secondary cooling starts control in ferritic phase height Ar3-30
~60 DEG C of ranges, final cooling temperature are controlled at 350-400 DEG C.
2. the preparation method as described in claim 1 based on TMCP process improving super-thick steel plate toughness and tenacities, which is characterized in that
The mill speed of rough rolling step is controlled in 0.5-2m/s in the step b).
3. the preparation method as described in claim 1 based on TMCP process improving super-thick steel plate toughness and tenacities, which is characterized in that
In the step b) in 950-980 DEG C of interval rolling temperature range, pass deformation rate is controlled more than 15%, during road minor tick
Between control at 30-90 seconds.
4. the preparation method as described in claim 1 based on TMCP process improving super-thick steel plate toughness and tenacities, which is characterized in that
Each stage sotck thinkness meets condition in the step b)：If thickness of strand is H, blank thickness h, interval rolling starts
When sotck thinkness be h1, then meet condition H/h >=2, H/h1 >=1.5 between three.
5. the preparation method as described in claim 1 based on TMCP process improving super-thick steel plate toughness and tenacities, which is characterized in that
Whole Process Control passage interval time in finish rolling stage is less than 20 seconds in the step c).
6. the preparation method as described in claim 1 based on TMCP process improving super-thick steel plate toughness and tenacities, which is characterized in that
In 2-5 DEG C/s, secondary cooling rate is more than 18 DEG C/s for a cooldown rate control in the step d).
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| CN201810042932.0A CN108251623A (en) | 2018-01-17 | 2018-01-17 | A kind of preparation method based on TMCP process improving super-thick steel plate toughness and tenacities |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105039870A (en) * | 2015-08-31 | 2015-11-11 | 山东钢铁股份有限公司 | X80M pipeline steel resistant to low temperature and large in strain and manufacturing method and application of X80M pipeline steel |
| CN105950973A (en) * | 2016-05-13 | 2016-09-21 | 江阴兴澄特种钢铁有限公司 | Thick-specification X80 pipeline steel plate excellent in ultralow-temperature drop hammer performance and manufacturing method thereof |
| CN106077085A (en) * | 2016-07-29 | 2016-11-09 | 中冶赛迪工程技术股份有限公司 | The production system of a kind of low yield strength ratio hot-rolled high-strength anti-seismic steel bar and method |
-
2018
- 2018-01-17 CN CN201810042932.0A patent/CN108251623A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103627980A (en) * | 2013-11-25 | 2014-03-12 | 首钢总公司 | Low-temperature X80HD (High Density) large-deformation pipeline steel with great wall thickness and production method thereof |
| CN105039870A (en) * | 2015-08-31 | 2015-11-11 | 山东钢铁股份有限公司 | X80M pipeline steel resistant to low temperature and large in strain and manufacturing method and application of X80M pipeline steel |
| CN105950973A (en) * | 2016-05-13 | 2016-09-21 | 江阴兴澄特种钢铁有限公司 | Thick-specification X80 pipeline steel plate excellent in ultralow-temperature drop hammer performance and manufacturing method thereof |
| CN106077085A (en) * | 2016-07-29 | 2016-11-09 | 中冶赛迪工程技术股份有限公司 | The production system of a kind of low yield strength ratio hot-rolled high-strength anti-seismic steel bar and method |
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Application publication date: 20180706 |