CN112126759A - Method for improving impact toughness of TMCP (thermal mechanical control processing) steel for ships by texture control - Google Patents
Method for improving impact toughness of TMCP (thermal mechanical control processing) steel for ships by texture control Download PDFInfo
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- CN112126759A CN112126759A CN202011064924.XA CN202011064924A CN112126759A CN 112126759 A CN112126759 A CN 112126759A CN 202011064924 A CN202011064924 A CN 202011064924A CN 112126759 A CN112126759 A CN 112126759A
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- steel plate
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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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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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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- 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
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Abstract
The invention discloses a method for improving impact toughness of TMCP steel for ships by texture control. The invention takes the prior industrial EH47 continuous casting billet as a raw material, adopts a TMCP two-stage controlled rolling process, and obtains texture distribution with higher strength at the center of a steel plate by controlling the deformation distribution of an intermediate billet under the conditions of low compression ratio and high finish rolling temperature and utilizing a method of air cooling, water cooling, air cooling and water cooling for four-stage cooling after rolling, and improves the impact work of the steel plate under the condition of-80 ℃ by utilizing the favorable texture with higher strength and the uniformly distributed {110} slip plane with higher content at the center of the steel plate. The production method can obviously improve the impact toughness of the steel plate at the temperature of-80 ℃, and has the advantages of simple production process, strong operability, small implementation difficulty and obvious texture control effect.
Description
Technical Field
The invention belongs to the field of manufacturing of steel plates for ships, and particularly relates to a method for improving the impact toughness of TMCP (thermal mechanical control processing) steel for ships by using a texture control technology.
Background
In recent years, large-scale development of ships and serious challenge to ship safety have led to rapid development of large-thickness ship steels having excellent low-temperature toughness. When the TMCP process is used for producing the ship steel, the components are subjected to low-carbon microalloying treatment and a certain content of Ni element is added, the total compression ratio in the rolling process is increased, the deformation in the rough rolling stage and the deformation in the finish rolling stage are optimized, the flattening state of austenite after finish rolling is finally changed, and a proper cooling procedure after rolling is matched, so that the refinement of phase-change structures (ferrite and bainite) and the good matching of relative contents are realized, and the excellent low-temperature toughness of a steel plate at the temperature of-60 ℃ can be basically ensured.
In actual production, because the thickness of a continuous casting billet is limited, and the thickness of a rolled steel plate is increased, the compression ratio is limited, the control of an austenite flattening state is more difficult, and the low-temperature toughness of the core part of the steel plate is difficult to ensure; when the test temperature is further reduced (such as reduced to-80 ℃), the limit performance of the TMCP steel plate is basically achieved, the excellent low-temperature toughness of the steel plate is difficult to continuously ensure under the condition, the impact energy of the steel plate is severely fluctuated and even shows a complete brittle fracture phenomenon, and the rating of the steel plate is finally deteriorated.
When the steel plate is used for producing large-thickness ship steel at a low compression ratio, in order to ensure excellent low-temperature toughness of the steel plate at the temperature of 80 ℃ below zero, the rolling temperature of an austenite non-recrystallization region can only be further reduced, so that the load of a rolling mill is increased, the danger coefficient of the rolling mill in the rolling process is obviously increased, and the difficulty of plate shape control is increased.
The texture strengthening is an additional geometric strengthening of the controlled rolling high-strength steel, but the influence of the texture factors on the low-temperature toughness of the steel plate is often ignored in the production and research processes of the prior ship plate steel. Actually, the low-temperature toughness of the steel plate can be obviously influenced by the crystallographic orientation, and the {112} - {223} <110> texture can obviously improve the impact toughness of the steel plate in the longitudinal direction; the {332} <113> texture generates small anisotropy on mechanical properties and brings good toughness; the 001 <110> texture tends to embrittle the material, seriously deteriorating the low temperature toughness of the steel sheet. It is found that in order to improve the low-temperature toughness of the ship plate steel at-80 ℃, the type of microstructure of the steel plate is controlled and refined as much as possible, and the type and strength of the texture of the steel plate are controlled, so that the advantageous texture strengths of {332} <113>, {112} <131> and {112} - {113} <110> are improved, and the texture strength of {001} <110> is reduced as much as possible.
In addition to texture, the distribution and content of crystal orientation, which is specifically designated as the 001 cleavage plane and the 110 slip plane, can also affect the impact properties of the steel sheet. In body centered cubic (bcc) metals, the 001 plane is a cleavage plane, and brittle cracks can propagate rapidly along the 001 plane, eventually leading to a large reduction in impact toughness; whereas the effect of the 110 slip planes on toughness is just the opposite, as a source of plastic deformation, the 110 planes can promote ductile fracture and improve impact performance. Therefore, in order to ensure excellent low-temperature toughness of the steel sheet, the content of the {001} cleavage plane should be reduced as much as possible, and the proportion of the {110} slip plane should be increased, while ensuring uniform distribution of the cleavage plane and the slip plane.
The texture type, strength and austenite state before water cooling of the steel plate have close relation, in the two-stage controlled rolling process, because austenite develops textures with different strengths and types, the textures are inherited to tissues after phase transformation according to a certain rule in the phase transformation process, and finally texture distribution with different strengths and types at normal temperature is formed. In other words, by controlling the flattening state of austenite grains in the TMCP process, namely the deformation of an austenite recrystallization region and a non-recrystallization region, and the cooling procedure after rolling, the texture type and strength of the steel plate can be completely controlled, so that the low-temperature impact toughness of the steel plate at-80 ℃ can be improved by utilizing favorable crystal texture.
Disclosure of Invention
The invention aims to provide a method for improving the impact toughness of TMCP steel for ships by texture control, which aims to control the main texture type and strength of a steel plate on the basis of the regulation and control of the low-temperature toughness of the traditional TMCP steel for ships, realizes the remarkable improvement of the low-temperature impact toughness of the TMCP steel for ships at the temperature of-80 ℃ under the conditions of low compression ratio and high finish rolling temperature, ensures that the longitudinal impact power of the core of the steel plate at-80 ℃ is more than or equal to 230J, and has strong operability, high production efficiency and small implementation difficulty.
In order to realize the purpose, the invention adopts the following technical scheme:
the method for improving the impact toughness of the TMCP steel for the ship by using texture control comprises the following steps:
1) the heating temperature of the continuous casting blank is 1050-1250 ℃, two stages of an austenite recrystallization zone and an austenite non-recrystallization zone are adopted for controlled rolling, the rolling temperature range of the austenite recrystallization zone is 1000-1250 ℃, and the rolling temperature range of the austenite non-recrystallization zone is 780-830 ℃; the total compression ratio in the rolling process is 3.57:1, the total reduction amount of an austenite recrystallization region is controlled to be 10-65%, the total reduction amount of an austenite non-recrystallization region is controlled to be 25-70%, and the thickness of an intermediate blank to be heated is 1.4-3.5 times of the thickness of a finished product;
2) after rolling, four stages of cooling modes of air cooling, water cooling, air cooling and water cooling are adopted in sequence. After the finish rolling, the surface temperature of the steel plate is firstly cooled to 750-780 ℃ in the air, then the surface temperature of the steel plate is firstly cooled to 440-520 ℃ by water, then the temperature is returned to the highest temperature of the surface of the steel plate in the air, and finally the temperature is cooled to 380-460 ℃ by water cooling.
The invention has the beneficial effects that: the invention utilizes the blank of the existing alloy component system to control the austenite state under the conditions of low compression ratio and high finish rolling temperature, finally controls the variety and the strength of the texture after phase transformation, and obtains a large amount of uniformly distributed {110} slip planes. The high-strength marine TMCP steel obtained by the method has the advantages that the-80 ℃ low-temperature impact energy is more than or equal to 230J, and the performance is stable; the invention has stable production process, strong operability, high production efficiency and small implementation difficulty.
Drawings
FIG. 1 shows a typical microstructure of the core of a steel sheet according to the invention.
FIG. 2(a) shows the texture distribution of the core of the steel sheet of the present invention. The strength of the {112} <131> texture exceeds 6, the strength of the {332} <113> texture exceeds 4, and the strength of the {112} - {113} <110> texture is also higher; FIG. 2(b) is a distribution of the positions of some ideal textures along the RD, ND and TD orientations.
FIG. 3 shows the distribution of the {001} cleavage plane and the {110} slip plane in the core of the steel sheet of the present invention, in which the {001} cleavage plane content is 2.2% and the {110} slip plane content is 39.1%.
FIG. 4 shows the core texture, cleavage plane and slip plane distribution of the steel sheet of comparative example, wherein FIGS. 4(a) and (b) show comparative example 1; FIGS. 4(c) and (d) are comparative example 2; FIGS. 4(e) and (f) are comparative example 3.
Detailed Description
The invention is further illustrated but is not in any way limited by the following specific examples.
The method for improving the impact toughness of TMCP steel for ships by texture control comprises the following steps:
1) the heating temperature of the continuous casting blank is 1050-1250 ℃, two stages of an austenite recrystallization zone and an austenite non-recrystallization zone are adopted for controlling rolling, the rolling temperature range of the austenite recrystallization zone is 1000-1250 ℃, and the rolling temperature range of the austenite non-recrystallization zone is 780-830 ℃.
2) The total compression ratio in the rolling process is 3.57:1, the total reduction amount of an austenite recrystallization zone is controlled to be 10-65%, the total reduction amount of an austenite non-recrystallization zone is controlled to be 25-70%, and the thickness of an intermediate blank to be heated is 1.4-3.5 times of the thickness of a finished product.
3) After rolling, adopting four-stage cooling modes of air cooling, water cooling, air cooling and water cooling: after the final rolling, firstly cooling the surface temperature of the steel plate in the air to between 10 and 20 and 750 to 780 ℃, then cooling the surface temperature of the steel plate to between 480 and plus or minus 40 ℃ by water, then returning the temperature in the air to the highest temperature of the surface of the steel plate, and finally cooling the steel plate to between 420 and plus or minus 40 ℃ by water cooling to obtain the required steel plate.
The matrix structure of the steel plate 1/2 prepared by the method is a mixed structure of ferrite and bainite, and the main textures are {112} <131>, {332} <113> and {112} - {113} <110 >.
TABLE 1 examples specific rolling process of steel sheets
TABLE 2 Low temperature impact Properties of the steel sheets of the examples
TABLE 3 contents of {001} cleavage plane and {110} slip plane in the core of steel sheets of examples
| Process for the preparation of a coating | {001} cleavage plane content/%) | {110} slip plane content/%) |
| Examples | 2.2 | 39.1 |
| Comparative example 1 | 8.8 | 17.4 |
| Comparative example 2 | 1.7 | 37 |
| Comparative example 3 | 6.8 | 31.6 |
In the following examples, the rolling process for improving-80 ℃ impact energy of the marine TMCP steel by using the texture control technology is shown in table 1, the low-temperature impact performance is shown in table 2, the contents of {001} cleavage plane and {110} slip plane in the core of the steel sheet are shown in table 3, and the distribution of the core texture, the cleavage plane and the slip plane is shown in fig. 2-4. The examples all use industrial EH47 continuous casting billet as raw material, and comprise the following components: c: 0.04-0.06%; si: 0.10-0.18%; mn: 1.20-2.00%; p is less than or equal to 0.010 percent; s is less than or equal to 0.0030 percent; and (3) Alt: 0.020-0.050%; ni: 0.45-0.90%; cu: 0.20-0.35%; mo: 0.01-0.30%; ti: 0.010-0.020%; nb: 0.020-0.045%; 0.15 to 0.23 percent of Cr; the balance of Fe and inevitable trace impurities.
Examples
The rolling process of the target steel grade is rolled as shown in the example in the table 1, the low-temperature impact performance is shown in the example in the table 2, and the texture distribution, the cleavage plane distribution and the slip plane distribution are shown in fig. 2 and 3.
Comparative example 1
The rolling process of the target steel grade was rolled as in comparative example 1 in table 1, the low temperature impact properties are shown in comparative example 1 in table 2, and the texture and crystal orientation distributions are shown in fig. 4(a) and (b).
Comparative example 2
The rolling process of the target steel grade was rolled as in comparative example 2 of table 1, the low temperature impact property was as shown in comparative example 2 of table 2, and the texture and crystal orientation distribution were as shown in fig. 4(c) and (d).
Comparative example 3
The rolling process of the target steel grade was rolled as in comparative example 3 in table 1, the low temperature impact properties are shown in comparative example 3 in table 2, and the texture and crystal orientation distributions are shown in fig. 4(e) and (f).
The results show that the steel sheet in the examples has the most excellent impact toughness under the condition of-80 ℃ and the most ideal distribution of the texture of the steel sheet core, wherein the {112} <131> texture strength exceeds 6, the {332} <113> texture strength exceeds 4, and the {112} - {113} <110> texture strength is higher, the content of {001} cleavage plane of the core is lower (2.2%), the proportion of {110} slip plane is higher (39.1%), and the {110} slip plane is uniformly distributed. In the comparative example, the strength of the core texture is generally weak, the content of the {110} slip plane is low and the distribution is uneven, and the impact energy is fluctuated or brittle failure occurs under the condition of-80 ℃.
In the embodiment of the invention, in order to reduce experimental errors when the surface temperature of the steel plate is measured, the same temperature measuring device, the same temperature measuring position and the same temperature measuring mode are adopted; in order to ensure the same cooling regulation, the cooling system keeps consistent water inlet temperature, water boiling time and water boiling amount in the water cooling process.
In the embodiment of the invention, the impact performance is carried out according to the national standard GB-T229-2007, the notch of the impact sample is V-shaped, and meanwhile, in order to ensure the reliability of the experimental result, the average value of three test data is taken as the final result.
In summary, the production method for improving the-80 ℃ impact energy of the ship TMCP steel by using the texture control technology utilizes the blank of the existing alloy component system, regulates and controls the deformation distribution of two-stage controlled rolling under the conditions of low compression ratio and high finish rolling temperature, and is matched with a three-stage cooling mode, so that the texture type and the strength of the core part of a rolled steel plate can be obviously improved, and the content and the distribution of a {001} cleavage plane and a {110} slip plane are regulated; when the rough rolling reduction is 30 percent and the finish rolling reduction is 60 percent, the strongest favorable texture distribution of the steel plate can be realized, and the impact energy of the core part of the steel plate at minus 80 ℃ is improved.
It will be apparent to those skilled in the art from this disclosure that many changes and modifications can be made, or equivalents modified, in the embodiments of the invention without departing from the scope of the invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention shall still fall within the protection scope of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (6)
1. The method for improving the impact toughness of the TMCP steel for the ship by using texture control is characterized by comprising the following steps of:
1) the heating temperature of the continuous casting blank is 1050-1250 ℃, two stages of an austenite recrystallization zone and an austenite non-recrystallization zone are adopted for controlled rolling, the rolling temperature range of the austenite recrystallization zone is 1000-1250 ℃, and the rolling temperature range of the austenite non-recrystallization zone is 780-830 ℃; the total compression ratio in the rolling process is 3.57:1, the total reduction amount of an austenite recrystallization region is controlled to be 10-65%, the total reduction amount of an austenite non-recrystallization region is controlled to be 25-70%, and the thickness of an intermediate blank to be heated is 1.4-3.5 times of the thickness of a finished product;
2) after rolling, four stages of cooling modes of air cooling, water cooling, air cooling and water cooling are adopted in sequence.
2. The method according to claim 1, wherein step 2) is specifically: after the finish rolling, firstly cooling the surface temperature of the steel plate to 750-780 ℃ in air, then cooling the surface temperature of the steel plate to 440-520 ℃ by water, then returning the temperature to the highest temperature of the surface of the steel plate in the air, and finally cooling the steel plate to the temperature of 380-460 ℃ by water cooling.
3. A steel sheet produced by the method of claim 1 or 2.
4. The steel plate according to claim 3, wherein the matrix structure at the position 1/2 of the steel plate is a mixed structure of ferrite and bainite, and the main textures at the position 1/2 are {112} <131>, {332} <113> and {112} - {113} <110> and {112} <131> texture strength > 6, {332} <113> texture strength > 4.
5. The steel sheet according to claim 4, wherein the content of {001} cleavage plane at the 1/2 position is 2.2%, {110} slip plane is 39.1%, and {110} slip planes are uniformly distributed.
6. The steel plate according to claim 4, wherein the steel plate has an impact energy of 290J or more at-60 ℃ and 230J or more at-80 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113403459A (en) * | 2021-05-25 | 2021-09-17 | 中国科学院金属研究所 | Rolling method for improving low-temperature impact toughness of X80 pipeline steel through texture control |
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| CN103589954A (en) * | 2013-11-29 | 2014-02-19 | 东北大学 | Hot rolling steel plate with characteristic of multiple grades in one steel, and manufacturing method thereof |
| CN105032958A (en) * | 2015-08-24 | 2015-11-11 | 东北大学 | Instant cooling system and cooling method for controlling rolling through interpass cooling technology |
| CN105256117A (en) * | 2015-10-22 | 2016-01-20 | 南京钢铁股份有限公司 | Manufacturing method for high-strength ship TMCP steel superior in minus-80 DEG C low-temperature toughness for polar region |
| CN106756543A (en) * | 2016-12-12 | 2017-05-31 | 南京钢铁股份有限公司 | A kind of TMCP states low cost Large Heat Input Welding strength ship plate steel high and its manufacture method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103589954A (en) * | 2013-11-29 | 2014-02-19 | 东北大学 | Hot rolling steel plate with characteristic of multiple grades in one steel, and manufacturing method thereof |
| CN105032958A (en) * | 2015-08-24 | 2015-11-11 | 东北大学 | Instant cooling system and cooling method for controlling rolling through interpass cooling technology |
| CN105256117A (en) * | 2015-10-22 | 2016-01-20 | 南京钢铁股份有限公司 | Manufacturing method for high-strength ship TMCP steel superior in minus-80 DEG C low-temperature toughness for polar region |
| CN106756543A (en) * | 2016-12-12 | 2017-05-31 | 南京钢铁股份有限公司 | A kind of TMCP states low cost Large Heat Input Welding strength ship plate steel high and its manufacture method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113403459A (en) * | 2021-05-25 | 2021-09-17 | 中国科学院金属研究所 | Rolling method for improving low-temperature impact toughness of X80 pipeline steel through texture control |
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