CN115216588A - Heat treatment method for improving core toughness of steel for large-thickness ultrahigh-strength ocean engineering - Google Patents
Heat treatment method for improving core toughness of steel for large-thickness ultrahigh-strength ocean engineering Download PDFInfo
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- CN115216588A CN115216588A CN202210895722.2A CN202210895722A CN115216588A CN 115216588 A CN115216588 A CN 115216588A CN 202210895722 A CN202210895722 A CN 202210895722A CN 115216588 A CN115216588 A CN 115216588A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 54
- 239000010959 steel Substances 0.000 title claims abstract description 54
- 238000010438 heat treatment Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005204 segregation Methods 0.000 claims abstract description 23
- 238000005096 rolling process Methods 0.000 claims abstract description 7
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 3
- 239000000956 alloy Substances 0.000 claims abstract description 3
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 229910001566 austenite Inorganic materials 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 10
- 238000009749 continuous casting Methods 0.000 claims description 5
- 238000005496 tempering Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910001563 bainite Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001887 electron backscatter diffraction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- 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
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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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
- C21D2211/001—Austenite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A heat treatment method for improving the core toughness of steel for large-thickness ultrahigh-strength ocean engineering, in particular to a heat treatment method for improving the performance of steel plates of the ultrahigh-strength ocean engineering steel with thickness of 80 to 150mm, which is produced by rolling and rolling slab with Cl class 2.0 grade and above center segregation. The steel comprises the alloy components of, by weight, 0.04-0.07% of C, 0.10-0.45% of Si, 1.40-1.70% of Mn, 0.018% or less of P, 0.015% or less of S, 0.02-0.05% of Al, 0.020-0.050% of Nb, 0.008-0.20% of Ti, 0.10-0.30% of Cu, 0.10-0.30% of Cr, 0.30-0.60% of Ni, 0.10-0.20% of Mo, and the balance of Fe and inevitable impurities. The invention can realize the matching of the high strength and the high toughness of the steel plate core with serious center segregation: after heat treatment, the core yield strength of the steel plate is more than 460MPa, the tensile strength is more than 560MPa, and the impact toughness of the steel plate core is more than 300J at-40 ℃ and more than 200J at-60 ℃.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and relates to a heat treatment method for improving the core toughness of steel for large-thickness ultrahigh-strength ocean engineering.
Background
The high-strength steel for ocean engineering is developing towards large thickness and excellent low-temperature toughness. The increase in the thickness of the steel plate inevitably requires the thickness of the continuous casting slab to be increased. However, the thick plate continuous casting inevitably has a center segregation defect, and the center segregation defect becomes more serious as the thickness of the casting increases. After heating and rolling a cast slab with severe center segregation, a severe band-shaped structure is often formed in the steel sheet, and the band-shaped structure seriously deteriorates the toughness and plasticity of the steel sheet. The difficulty of the delivered large-thickness steel plate is very high in production, particularly, the steel plate with the thickness of more than 80mm has very serious segregation problem, the impact toughness of the core of the steel plate which is often produced does not reach the standard, the production causes great difficulty, and if other methods are used for improvement and rescue, the method is an important auxiliary method for producing the thick plate marine engineering.
Disclosure of Invention
The invention aims to provide a heat treatment method for improving the core toughness of steel for large-thickness ultrahigh-strength ocean engineering, and the heat treatment method is used for improving the technical problem of the performance of steel plates of the ultrahigh-strength ocean engineering steel with serious segregation of class C2.0 and above in the conventional plate blank.
The technical scheme of the invention is as follows:
a heat treatment method for improving the core toughness of steel for large-thickness ultrahigh-strength ocean engineering is characterized by comprising the following steps: the steel comprises the alloy components of, by weight, 0.04-0.07% of C, 0.10-0.45% of Si, 1.40-1.70% of Mn, 0.018% of P, 0.015% of S, 0.02-0.05% of Al, 0.020-0.050% of Nb, 0.008-0.20% of Ti, 0.10-0.30% of Cu, 0.10-0.30% of Cr, 0.30-0.60% of Ni, 0.10-0.20% of Mo and the balance of Fe and inevitable impurities; the method comprises the following process steps:
(1) Tempering the steel plate with the thickness of 80 to 150mm after continuous casting and rolling at 760 to 820 ℃, heating the steel plate to the required temperature along with a furnace, preserving the heat for 15 to 200min, and then air-cooling or water-cooling to the room temperature;
(2) And (3) heating the steel plate after heat treatment to 620-660 ℃ along with the furnace again, preserving the heat for 15-200min, and air-cooling to room temperature to obtain the steel plate with the core austenite component of more than 6.5%, wherein the residual austenite accounts for 7.5% in a segregation region, the non-segregation residual austenite accounts for 5%, the residual austenite is dispersed and distributed at a grain boundary, and the size is in a nanometer level.
The invention has the beneficial effects that: through the normalizing process, austenite-promoting stabilizing elements in the thick plate are further enriched in a smaller area, then the critical tempering is carried out, a large amount of stable and fine residual austenite tissues are obtained after the air cooling is carried out to the room temperature, the segregation zone at the center of the plate becomes fine and dispersed, the austenite is increased, so that the strength is slightly reduced, the plastic toughness is greatly increased, and the aim of improving the mechanical property of the thick plate with serious center segregation is fulfilled. In particular to a heat treatment method for improving the performance of a steel plate for the steel in the ultra-high strength ocean engineering with serious center segregation of more than 1.5 grade, wherein the mechanical properties of the steel plate meet the following requirements: the core yield strength of the steel plate is more than 460MPa, the tensile strength is more than 560MPa, and the impact toughness of the steel plate core is more than 300J at-40 ℃ and more than 200J at-60 ℃.
Drawings
FIG. 1 is a low-magnification view of a rolled steel sheet after hot pickling.
FIG. 2 is a phase diagram of the gold phase of the steel in the rolled state (a) and the steel in the embodiment 1 (b) of the present invention observed by an optical microscope after being attacked by nitric acid and ethanol.
FIG. 3 is an SEM image of the center of a steel of example 1 of the present invention.
FIG. 4 shows EBSD of the core of steel of example 1 of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples.
A group of embodiments of heat treatment methods for improving the core toughness of steel for large-thickness ultrahigh-strength ocean engineering comprise the following process steps:
(1) Carrying out tempering at 760 to 820 ℃ on a steel plate with the thickness of 80 to 150mm after continuous casting and rolling, heating the steel plate to the required temperature along with a furnace, then preserving the heat for 15 to 200min, and then carrying out air cooling or water cooling to the room temperature;
(2) And (3) heating the steel plate after heat treatment to 620-660 ℃ along with the furnace again, preserving the heat for 15-200min, and air-cooling to room temperature to obtain the steel plate with the core austenite component of more than 6.5%, wherein the residual austenite accounts for 7.5% in a segregation region, the non-segregation residual austenite accounts for 5%, the residual austenite is dispersed and distributed at a grain boundary, and the size is in a nanometer level.
Table 1 is a table listing the chemical composition in weight percent for each example; table 2 shows the heat treatment process parameters of the examples; table 3 is a table showing the results of mechanical property measurements of each example and comparative example.
Table 1 weight percent content of chemical components (%)
TABLE 2 Heat treatment Process parameters for the examples
TABLE 3 tabulation of mechanical property test results of each example and comparative example
The data in Table 3 show that the yield strength, yield ratio, elongation and impact toughness of the steel products of the examples of the invention all meet the requirements of the ultra-high strength marine steel S460MLO, while the elongation and low-temperature impact toughness of the comparative examples 1 and 2 do not meet the requirements, and the examples have greatly improved the performance problem caused by 2.0 grade segregation of the core part of the marine steel S460MLO steel plate through heat treatment.
The attached drawings are low-power and metallographic structure description:
1) As can be seen from the low magnification figure 1, the segregation phenomenon of the rolled thick steel plate is extremely obvious, the core segregation reaches more than 2.0 grade, and the low-temperature toughness of the steel plate core is checked;
2) The comparison of the rolling state in the example of the figure 2 on the core metallographic phase can obtain that the core segregation zone of the plate after heat treatment is greatly improved, and the core segregation zone of the plate in the example 1 after heat treatment is finer and relatively more uniformly distributed;
3) According to the SEM observation of figure 3, in the embodiment 1, the core segregation of the plate after heat treatment is not obvious, and the structure can not see horse/bainite, and the plate is basically granular bainite and acicular ferrite;
4) As can be seen from the EBSD chart in FIG. 4, the core of the plate of example 1 after heat treatment according to the present invention has a large amount of finely dispersed residual austenite to be maintained at room temperature, so that the low temperature toughness of the core of the S460MLO steel plate having severe center segregation is improved.
Claims (1)
1. A heat treatment method for improving the core toughness of steel for large-thickness ultrahigh-strength ocean engineering is characterized by comprising the following steps: the alloy components and percentages of the steel are C =0.04% -0.07%, si =0.10% -0.45%, mn =1.40% -1.70%, P is less than or equal to 0.018%, S is less than or equal to 0.015%, al =0.02% -0.05%, nb =0.020% -0.050%, ti =0.008% -0.20%, cu =0.10% -0.30%, cr =0.10% -0.30%, ni =0.30% -0.60%, mo =0.10% -0.20%, and the balance of Fe and inevitable impurities; the method comprises the following process steps:
(1) Carrying out tempering at 760 to 820 ℃ on a steel plate with the thickness of 80 to 150mm after continuous casting and rolling, heating the steel plate to the required temperature along with a furnace, then preserving the heat for 15 to 200min, and then carrying out air cooling or water cooling to the room temperature;
(2) And (3) heating the steel plate after heat treatment to 620-660 ℃ along with the furnace again, preserving the heat for 15-200min, and air-cooling to room temperature to obtain the steel plate with the core austenite component of more than 6.5%, wherein the residual austenite accounts for 7.5% in a segregation region, the non-segregation residual austenite accounts for 5%, the residual austenite is dispersed and distributed at a grain boundary, and the size is in a nanometer level.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116770198A (en) * | 2023-08-25 | 2023-09-19 | 张家港宏昌钢板有限公司 | Steel plate for low-compression-ratio hydropower and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101328564A (en) * | 2007-06-21 | 2008-12-24 | 宝山钢铁股份有限公司 | Low yield ratio HT780 steel plate having superior weldability and manufacturing method thereof |
| CN114107812A (en) * | 2021-11-16 | 2022-03-01 | 中联先进钢铁材料技术有限责任公司 | High-fracture-toughness 420 MPa-grade heat-treated steel plate for marine platform and preparation method thereof |
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2022
- 2022-07-28 CN CN202210895722.2A patent/CN115216588A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101328564A (en) * | 2007-06-21 | 2008-12-24 | 宝山钢铁股份有限公司 | Low yield ratio HT780 steel plate having superior weldability and manufacturing method thereof |
| CN114107812A (en) * | 2021-11-16 | 2022-03-01 | 中联先进钢铁材料技术有限责任公司 | High-fracture-toughness 420 MPa-grade heat-treated steel plate for marine platform and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116770198A (en) * | 2023-08-25 | 2023-09-19 | 张家港宏昌钢板有限公司 | Steel plate for low-compression-ratio hydropower and preparation method thereof |
| CN116770198B (en) * | 2023-08-25 | 2023-11-03 | 张家港宏昌钢板有限公司 | Steel plate for low-compression-ratio hydropower and preparation method thereof |
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Application publication date: 20221021 |