CN110846554A - High-ductility EH 32-grade ocean engineering steel and manufacturing method of steel plate - Google Patents
High-ductility EH 32-grade ocean engineering steel and manufacturing method of steel plate 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
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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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
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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
- B21B37/58—Roll-force control; Roll-gap control
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- 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
-
- 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
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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
- C21D2211/009—Pearlite
Abstract
A manufacturing method of EH32 grade ocean engineering steel with high ductility and a steel plate belongs to the field of steel material preparation. The chemical components of the EH32 grade steel for ocean engineering comprise, by weight: c: 0.05 to 0.11%, Si: 0.10 to 0.30%, Mn: 1.00-1.50%, P: less than or equal to 0.01 percent, S: less than or equal to 0.01 percent, Als: 0.01 to 0.05 percent, and the balance of Fe and inevitable impurities. According to the invention, a large amount of systematic experimental researches are carried out on the aspects of alloy element content, steel cleanliness control, process optimization and parameter selection, microstructure control and the like, and the finally manufactured EH 32-grade steel plate has the characteristics of high ductility, excellent low-temperature toughness and good fracture toughness.
Description
Technical Field
The invention belongs to the field of steel material preparation, and particularly relates to a steel plate with high ductility, low-temperature impact toughness and excellent fracture toughness test performance and a manufacturing method thereof.
Background
In recent years, although marine accidents involving marine engineering equipment are decreasing, severe marine troubles occur occasionally, and huge property and life losses are often caused. Therefore, it is important not only to provide measures to prevent collision and grounding of marine engineering equipment, but also to minimize losses in the event of a marine accident.
At present, steel plates for building ship and ocean engineering equipment are required to have good performance requirements of toughness matching, low-temperature toughness, easy welding and the like, and are particularly required to have high ductility, so that when the ship and the ocean engineering equipment collide and are stranded, the steel plates absorb collision energy, and the collision resistance of the equipment is improved.
The invention patent with the publication number of CN108330407A provides a low-carbon TMCP process EH36 ship board and a production method thereof. The micro-alloy elements Nb are added in the composition, wherein the content of Nb is 0.030-0.045%, the content of V is 0.030-0.045%, and the content of Ti is 0.008-0.020%, so that the production cost is increased; in addition, the elongation of the steel plate developed by the production process is less than 30 percent.
The invention patent with publication number CN103510000A provides a high-toughness low-NDT-temperature steel material for ships and ocean engineering and a production process thereof. The micro-alloy elements Nb are 0.015-0.030% and Ti is 0.005-0.020% in the components, and in addition, the technology is complex in production process, long in production period and high in production cost.
The invention patent with the publication number of CN105063485A provides a 355 MPa-grade low-temperature toughness thick steel plate and a preparation method thereof. 0.015-0.045% of Nb, 0.020-0.050% of V and 0.008-0.020% of Ti are added, so that the production cost is increased; in addition, the elongation of the steel plate developed by the production process is less than 30 percent.
According to the invention, the microstructure and the grain size of the steel plate are regulated and controlled by alloy reduction and controlled rolling and controlled cooling processes, so that the steel plate with high yield, stable strength and toughness and particularly high ductility is obtained.
Disclosure of Invention
The invention aims to provide EH32 grade ocean engineering steel with high ductility and a manufacturing method thereof, and the EH32 grade steel plate has the characteristics of high ductility (the elongation is more than or equal to 33%), excellent low-temperature toughness (the impact energy at 40 ℃ is more than or equal to 200J) and good fracture toughness (the NDTT temperature is less than or equal to minus 40 ℃).
In order to realize the purpose of the invention, a large amount of systematic experimental researches are carried out from the aspects of alloy element content, steel cleanliness control, process optimization and parameter selection, microstructure control and the like, and finally the alloy element proportion and the preparation process which can meet the purpose of the invention are determined.
The technical scheme of the invention is as follows:
the high-ductility grade EH32 steel for ocean engineering comprises the following chemical components in percentage by weight: c: 0.05 to 0.11%, Si: 0.10 to 0.30%, Mn: 1.00-1.50%, P: less than or equal to 0.01 percent, S: less than or equal to 0.01 percent, Als: 0.01 to 0.05 percent, and the balance of Fe and inevitable impurities.
The manufacturing method of the EH32 grade steel plate with high ductility for ocean engineering comprises the following steps:
(1) the smelting process comprises the following steps: smelting according to the component proportion of EH32 grade ocean engineering steel, and obtaining a continuous casting blank after smelting and continuous casting, wherein in the smelting process, the treatment time of LF and RH refining furnaces is 10-30 min, the superheat degree of tundish molten steel is less than or equal to 25 ℃, and the whole process is protected for casting; the A, B, C, D type inclusions in the steel meet the following requirements: a is less than or equal to 0.5, B is less than or equal to 0.5, C is less than or equal to 1.0 and D is less than or equal to 1.0.
(2) A heating process: in order to prevent the billet from being overheated and the original austenite grains from being coarse in the heating process, the heating temperature is controlled to be 1150-1200 ℃.
(3) The rolling process comprises the following steps: three-stage rolling is adopted for the continuous casting billet, the rolling temperature of the first stage is in an austenite recrystallization temperature region of 940-980 ℃, and the average single-pass reduction rate is more than 10 percent, so that austenite is fully recrystallized, and the grain size of austenite is refined; the rolling temperature of the second stage is in an austenite non-recrystallization temperature region of 830-880 ℃, and the average single-pass reduction rate is more than 10%; the rolling temperature of the third stage is an austenite-ferrite two-phase region of 730-750 ℃, and the cumulative reduction rate is 20-30%. The three-stage rolling aims to fully deform austenite grains, provide energy storage and positions for phase change nucleation, improve the phase change nucleation rate, further reduce ferrite grains by deformation of a two-phase region and finally achieve the purpose of grain refinement.
(4) Straightening process: the straightening temperature is 810-850 ℃; improve the flatness of the steel plate and simultaneously prevent the problems of warping and the like of the steel plate in the cooling process.
(5) And (3) a cooling process: a rapid laminar cooling system with the average cooling speed of 3-10 ℃/s is adopted, the temperature of the red returning is controlled to be 500-650 ℃, the purpose is to control the composition and the size of a phase change structure, the steel plate is slowly cooled, and the slow cooling time is more than or equal to 24 hours.
The post-elongation-rupture elongation of the EH32 grade steel plate for ocean engineering is more than or equal to 33%, the yield strength is more than or equal to 320MPa, and the tensile strength is 440-570 MPa.
The Charpy impact work of the EH32 grade steel plate for ocean engineering at-40 ℃ is more than or equal to 200J, and the zero plastic transition temperature (NDTT) is less than-40 ℃.
The microstructure of the EH32 grade steel plate for ocean engineering is ferrite and pearlite, wherein the average grain size of the ferrite is 5.0-8.0 mu m, and the ferrite content is 85-90%.
The thickness of the EH32 grade steel plate for ocean engineering is 10-40 mm.
The action mechanism of each alloy component in the steel of the invention is that the percentage symbol percent represents the weight percentage:
c: the steel is an essential element for ensuring the strength, the steel strength is obviously improved through solid solution strengthening and precipitation strengthening, but the excessively high C content has negative effects on the ductility, the low-temperature toughness and the fracture toughness of the steel, and the C content is preferably controlled to be 0.05-0.11% from the viewpoint of product performance.
Si: it is a main deoxidizing component in the steel making process, and it is necessary to contain 0.10% or more in order to obtain a sufficient deoxidizing effect, but if it exceeds the upper limit, the toughness of the base material and the welded portion is lowered, and Si present in a solid solution form can increase the ductile-brittle transition temperature as well as the strength, so the Si content is preferably 0.10 to 0.30%.
Mn: is an essential element for ensuring the strength and toughness of the steel. In order to improve the toughness of the material, the content of Mn is 1.00-1.50%.
P: the low-temperature toughness-reducing alloy is an element which brings adverse effects on low-temperature toughness and ductility, can be segregated in the central part of a slab, is aggregated in a grain boundary and the like to damage the low-temperature toughness, and is controlled to be not higher than 0.01 percent.
S: the material is an element which brings adverse effects on low-temperature toughness and ductility, can form sulfide inclusions to become a crack source, and is controlled to be not higher than 0.01%.
And Als: the content of the deoxidizing and grain refining element to be added in the present invention is 0.01% or more, but if it exceeds 0.08%, hot cracking of the cast slab is likely to occur, and the toughness of the steel is lowered. The content of Als is controlled between 0.01 and 0.05 percent.
The invention has the beneficial effects that:
(1) the chemical components of the steel plate are subjected to reduction design, and noble elements such as Ni and microalloy are not added; by controlling the contents of sulfur and phosphorus, particularly by adopting the methods of controlled rolling and controlled cooling, the steel product can have high ductility, excellent low-temperature toughness and fracture toughness.
(2) The elongation after tensile fracture of the steel plate is more than or equal to 33 percent, the yield strength is more than or equal to 320MPa, the tensile strength is 440-570 MPa, the Charpy impact energy at minus 40 ℃ is more than or equal to 200J, the zero plastic transition temperature (NDTT) is less than or equal to minus 40 ℃, and the thickness range of the product is 10-40 mm.
(3) The ferrite content in the steel is 85-90%, and the average grain size of the ferrite is 5.0-8.0 μm.
Drawings
FIG. 1 is a microstructure view of an example.
Detailed Description
The technical solution of the present invention will be further described with reference to specific examples.
Table 1 shows the chemical compositions of the steels of the examples; table 2 shows the process of smelting the steels of the examples; table 3 shows the rolling process of the example steels; table 4 shows the mechanical properties of the steels of the examples; table 5 shows the low temperature properties and NDTT temperatures of the steels of the examples of the present invention.
TABLE 1 chemical composition of steel of examples of the invention
TABLE 2 Steel smelting Process according to the invention
Table 3 method for preparing steel of examples of the present invention
TABLE 4 general tensile mechanical properties, ferrite content and average grain size of the steels of the examples of the invention
TABLE 5 Low temperature Performance and NDTT temperature of steels according to examples of the invention
Claims (9)
1. The high-ductility grade EH32 steel for ocean engineering is characterized in that the chemical components of the grade EH32 steel for ocean engineering comprise the following components in percentage by weight: c: 0.05 to 0.11%, Si: 0.10 to 0.30%, Mn: 1.00-1.50%, P: less than or equal to 0.01 percent, S: less than or equal to 0.01 percent, Als: 0.01 to 0.05 percent, and the balance of Fe and inevitable impurities.
2. The manufacturing method of the EH32 grade steel plate with high ductility for ocean engineering is characterized by comprising the following steps:
(1) the smelting process comprises the following steps: smelting according to the component proportion of the EH32 grade ocean engineering steel with high ductility as claimed in claim 1, and obtaining a continuous casting billet after smelting and continuous casting, wherein in the smelting process, the processing time of LF and RH refining furnaces is 10-30 min, the superheat degree of the tundish molten steel is less than or equal to 25 ℃, and the whole process is protected for casting; the A, B, C, D type inclusions in the steel meet the following requirements: a is less than or equal to 0.5, B is less than or equal to 0.5, C is less than or equal to 1.0, and D is less than or equal to 1.0;
(2) a heating process: the heating temperature is controlled to be 1150-1200 ℃;
(3) the rolling process comprises the following steps: three-stage rolling is adopted for the continuous casting billet, the rolling temperature of the first stage is in an austenite recrystallization temperature region of 940-980 ℃, and the average single-pass reduction rate is more than 10%; the rolling temperature of the second stage is in an austenite non-recrystallization temperature region of 830-880 ℃, and the average single-pass reduction rate is more than 10%; the rolling temperature of the third stage is an austenite-ferrite two-phase region of 730-750 ℃, and the accumulated reduction rate is 20-30%;
(4) straightening process: the straightening temperature is 810-850 ℃;
(5) and (3) a cooling process: a rapid laminar cooling system with the average cooling speed of 3-10 ℃/s is adopted, the temperature of the red returning is controlled to be 500-650 ℃, and the slow cooling time is more than or equal to 24 hours.
3. The method for manufacturing the steel plate for EH32 grade ocean engineering with high ductility according to claim 2, wherein the steel plate for EH32 grade ocean engineering has an elongation after elongation at break of not less than 33%, a yield strength of not less than 320MPa, and a tensile strength of 440-570 MPa.
4. The method for manufacturing the steel plate for EH32 grade ocean engineering with high ductility according to claim 2 or 3, wherein the steel plate for EH32 grade ocean engineering has a Charpy impact work at-40 ℃ or more of 200J and a zero plastic transition temperature of less than-40 ℃.
5. The method for manufacturing the steel plate for EH32 grade ocean engineering having high ductility according to claim 2 or 3, wherein the microstructure of the steel plate for EH32 grade ocean engineering is ferrite and pearlite, wherein the ferrite has an average grain size of 5.0 to 8.0 μm and a ferrite content of 85 to 90%.
6. The method for manufacturing the steel plate for EH32 grade ocean engineering having high ductility according to claim 4, wherein the microstructure of the steel plate for EH32 grade ocean engineering is ferrite and pearlite, wherein the ferrite has an average grain size of 5.0 to 8.0 μm and a ferrite content of 85 to 90%.
7. The method for manufacturing a steel plate for EH32 grade ocean engineering having high ductility according to claim 2, 3 or 6, wherein the thickness is 10 to 40 mm.
8. The method for manufacturing the steel plate for EH32 grade ocean engineering having high ductility according to claim 4, wherein the thickness is 10 to 40 mm.
9. The method for manufacturing the steel plate for EH32 grade ocean engineering having high ductility according to claim 5, wherein the thickness is 10 to 40 mm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113174536A (en) * | 2021-04-13 | 2021-07-27 | 鞍钢股份有限公司 | Economical low-temperature toughness E-grade high-strength steel plate for ship and manufacturing method thereof |
| CN114657472A (en) * | 2022-04-02 | 2022-06-24 | 鞍钢股份有限公司 | Marine ultrahigh-strength low-temperature steel with excellent fatigue performance and manufacturing method thereof |
| CN114807761A (en) * | 2022-04-28 | 2022-07-29 | 鞍钢股份有限公司 | EH36 grade ocean engineering steel with high ductility and manufacturing method thereof |
| CN115074630A (en) * | 2022-07-01 | 2022-09-20 | 鞍钢股份有限公司 | FH36 grade ocean engineering steel with high ductility and manufacturing method thereof |
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| JPH11256229A (en) * | 1998-03-13 | 1999-09-21 | Nkk Corp | Steel excellent in brittle fracture propagation stopping characteristic and its production |
| CN109207854A (en) * | 2018-10-08 | 2019-01-15 | 鞍钢股份有限公司 | The Marine Engineering Steel and its manufacturing method of ultra-wide size high-tensile high-ductility performance |
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2019
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11256229A (en) * | 1998-03-13 | 1999-09-21 | Nkk Corp | Steel excellent in brittle fracture propagation stopping characteristic and its production |
| CN109207854A (en) * | 2018-10-08 | 2019-01-15 | 鞍钢股份有限公司 | The Marine Engineering Steel and its manufacturing method of ultra-wide size high-tensile high-ductility performance |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113174536A (en) * | 2021-04-13 | 2021-07-27 | 鞍钢股份有限公司 | Economical low-temperature toughness E-grade high-strength steel plate for ship and manufacturing method thereof |
| CN113174536B (en) * | 2021-04-13 | 2023-03-03 | 鞍钢股份有限公司 | Economical low-temperature toughness E-grade high-strength steel plate for ship and manufacturing method thereof |
| CN114657472A (en) * | 2022-04-02 | 2022-06-24 | 鞍钢股份有限公司 | Marine ultrahigh-strength low-temperature steel with excellent fatigue performance and manufacturing method thereof |
| CN114807761A (en) * | 2022-04-28 | 2022-07-29 | 鞍钢股份有限公司 | EH36 grade ocean engineering steel with high ductility and manufacturing method thereof |
| CN114807761B (en) * | 2022-04-28 | 2023-08-18 | 鞍钢股份有限公司 | EH36 grade marine engineering steel having high ductility and method for manufacturing same |
| CN115074630A (en) * | 2022-07-01 | 2022-09-20 | 鞍钢股份有限公司 | FH36 grade ocean engineering steel with high ductility and manufacturing method thereof |
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| CN110846554B (en) | 2021-06-08 |
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