CN112779471B - Duplex stainless steel deformed steel bar for coastal super engineering and preparation process thereof - Google Patents
Duplex stainless steel deformed steel bar for coastal super engineering and preparation process thereof Download PDFInfo
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- CN112779471B CN112779471B CN202011575146.0A CN202011575146A CN112779471B CN 112779471 B CN112779471 B CN 112779471B CN 202011575146 A CN202011575146 A CN 202011575146A CN 112779471 B CN112779471 B CN 112779471B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 49
- 239000010959 steel Substances 0.000 title claims abstract description 49
- 229910001039 duplex stainless steel Inorganic materials 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 238000005516 engineering process Methods 0.000 title description 2
- 238000005096 rolling process Methods 0.000 claims abstract description 36
- 238000001816 cooling Methods 0.000 claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 14
- 230000007797 corrosion Effects 0.000 claims abstract description 10
- 238000005260 corrosion Methods 0.000 claims abstract description 10
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 8
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 7
- 229910052796 boron Inorganic materials 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 230000000149 penetrating effect Effects 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 238000007670 refining Methods 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 5
- 229910000859 α-Fe Inorganic materials 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims 1
- 238000012986 modification Methods 0.000 claims 1
- 239000000463 material Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000004925 denaturation Methods 0.000 description 1
- 230000036425 denaturation Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- -1 external refining Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 235000008373 pickled product Nutrition 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
Classifications
-
- 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
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- 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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/18—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
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a duplex stainless steel deformed steel bar for coastal super engineering, which comprises the following components in percentage by weight: c is less than 0.03%, Si: 0.2-0.6%, Mn: 0.8-1.5%, S is less than or equal to 0.005%, P is less than or equal to 0.035%, Cr: 25.0 to 27.0%, Ni: 6.0-7.0%, Mo: 3.0-4.0%, N: 0.24-0.32%, B: 0.002-0.005%; the balance of iron and other inevitable impurities, and the pitting corrosion resistance equivalent PREN is more than or equal to 41; the preparation process comprises controlling the total sum of eight inclusions of the duplex stainless steel deformed steel bar to be less than or equal to 6.5 grade and the single inclusion to be less than 1.5 grade, performing rough rolling, intermediate rolling and finish rolling on the blank at 1180-1250 ℃, and rapidly cooling to be below 800 ℃ after finish rolling to obtain a finished product. The invention has the characteristics of high mechanical property, high pitting coefficient and long service life.
Description
Technical Field
The invention relates to duplex stainless steel deformed steel bar, in particular to duplex stainless steel deformed steel bar for coastal super engineering.
Background
In the field of coastal super engineering, such as coastal engineering of bridges, sea reclamation, harbors, etc., and offshore engineering including offshore platforms, artificial islands, oil and gas exploration and production platforms, etc., steel materials are used in large quantities for manufacturing various structural members and equipment. The duplex stainless steel has the characteristics of high strength, excellent stress corrosion resistance and the like, is particularly suitable for the field of ocean engineering, and becomes one of attractive alternative materials for deep water and ultra-deep water environments along with the vigorous development of deep sea engineering in recent years. However, the coastal corrosion environment is complex, the content of corrosive ions in seabed and seawater is high, for example, chloride ions have strong corrosivity, general metal materials have poor corrosion resistance, and the current duplex stainless steel has low mechanical property and low pitting coefficient, cannot completely meet the severe coastal corrosion environment, and has short service life.
Therefore, the existing duplex stainless steel has the problems of low mechanical property, low pitting coefficient and short service life.
Disclosure of Invention
The invention aims to provide duplex stainless steel deformed steel bar for coastal super engineering and a preparation process thereof. The invention has the characteristics of high mechanical property, high pitting coefficient and long service life.
The technical scheme of the invention is as follows: a duplex stainless steel deformed steel bar for coastal super engineering comprises the following components by weight percent: c is less than 0.03%, Si: 0.2-0.6%, Mn: 0.8-1.5%, S is less than or equal to 0.005%, P is less than or equal to 0.035%, Cr: 25.0 to 27.0%, Ni: 6.0-7.0%, Mo: 3.0-4.0%, N: 0.24-0.32%, B: 0.002-0.005%; the balance of iron and other inevitable impurities, and the pitting corrosion resistance equivalent PREN is more than or equal to 41.
The duplex stainless steel deformed steel bar for the coastal super engineering comprises the following components in percentage by weight: c: 0.016%, Si: 0.49%, Mn: 0.68%, S: 0.0016%, P: 0.034%, Cr: 25.12%, Ni: 6.33%, Mo: 3.60%, N: 0.274%, B: 0.003%; the balance being iron and other unavoidable impurities, and a pitting corrosion resistance equivalent PREN of 41.38.
In the duplex stainless steel deformed steel bar for the coastal super engineering, the ferrite content is 35-65%.
In the duplex stainless steel deformed steel bar for the coastal super engineering, the total sum of eight inclusions in the duplex stainless steel deformed steel bar is less than or equal to 6.5 grades.
The preparation process of the duplex stainless steel deformed steel bar for the coastal super engineering comprises the steps of deep deoxidation of molten steel, external refining, aluminum deoxidation of slag surface, silicon-calcium wire deoxidation and inclusion denaturation, wherein the total sum of eight inclusions of the duplex stainless steel deformed steel bar is controlled to be less than or equal to 6.5 grade, and the single inclusion is controlled to be less than 1.5 grade, and the blank is subjected to rough rolling, medium rolling and finish rolling at the temperature of 1180 plus 1250 ℃, and the temperature is rapidly reduced to be less than 800 ℃ after the finish rolling to obtain a finished product.
In the preparation process of the duplex stainless steel deformed steel bar for the coastal super engineering, 4 rough rolling stands, 6 medium rolling stands and 6 finish rolling stands are adopted during rolling.
In the preparation process of the duplex stainless steel deformed steel bar for the coastal super engineering, the linear speed of the product is 5-10m/s, the length of the water pipe is 4-8 m, and the time of the product passing through the water pipe is 0.4-1s in the cooling process.
In the preparation process of the duplex stainless steel deformed steel bar for the coastal super engineering, the linear speed of the product is 8m/s, the length of the water pipe is 6 m, and the time of the product passing through the water pipe is 0.75s in the cooling process.
Compared with the prior art, the optimum content range of each element is optimized, the components of Mo and N are mainly adjusted, the strength of the product is improved, the boron element is adjusted, the boron element has the functions of refining grains and improving the heat conduction performance, the hot processing performance of the material and the precipitation speed of a precipitated phase are further improved, the generation of the precipitated phase of the material in the processing process is reduced, and the surface of the pickled product is free of crack defects.
Through the combination of various means, the total sum of eight inclusions of the duplex stainless steel deformed steel is controlled to be less than or equal to 6.5 grade, and the purity of the molten steel with a single inclusion less than 1.5 grade, so that the cracking defect of the material in the hot working rolling process is avoided; by controlling the heating temperature and the cooling temperature in the rolling process, the nose tip temperature of precipitated phases is avoided, the full rolling of ferrite phases of the blank in the rough and medium rolling process is ensured, and the comprehensive mechanical properties of the product are improved.
The company successfully rolls S32750 duplex stainless steel deformed steel bar with 12-25 screw bolts through product research and development trial production, the yield strength is more than or equal to 700MPa, the tensile strength is more than or equal to 850MPa, the elongation after fracture is more than or equal to 25 percent, and the elongation under maximum force is more than or equal to 10 percent. The tensile property is best at 1150 ℃, the temperature is kept for 0.5h at 1150 ℃, and the ferrite phase volume can reach 60 percent by rapid water cooling detection.
Therefore, the invention has the characteristics of high mechanical property, high pitting coefficient and long service life.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.
Examples are given.
The first embodiment is as follows:
a duplex stainless steel deformed steel bar for coastal super engineering is provided, the steel grade is S32750, and the steel bar comprises the following components by weight percent: c: 0.012%, Si: 0.47%, Mn: 0.68%, S: 0.0011%, P: 0.033%, Cr: 25.50%, Ni: 6.51%, Mo: 3.70%, N: 0.275%; b: 0.0025 percent; the balance being iron and other unavoidable impurities, and a pitting resistance equivalent PREN: 42.11.
The preparation process of the duplex stainless steel deformed steel comprises the steps of carrying out deep deoxidation on molten steel, refining outside a furnace, carrying out aluminum deoxidation on a slag surface, deoxidizing by using a silicon-calcium wire and modifying inclusions, controlling the total sum of eight inclusions of the duplex stainless steel deformed steel to be less than or equal to 6.5 grades and the single inclusion to be less than 1.5 grades, carrying out rough rolling on a blank for 4 frames, medium rolling for 6 frames and finish rolling for 6 frames at 1200 ℃, rapidly cooling to below 800 ℃ after finish rolling, wherein in the cooling process, the linear velocity of a product is 8m/s, the length of a water penetrating pipe is 6 meters, and the time of the product passing through the water penetrating pipe is 0.75s, thus obtaining a finished product. The prepared duplex stainless steel deformed steel bar has the yield strength of 850-900MPa, the tensile strength of 910-950MPa, the elongation after fracture of 25 percent, the elongation at maximum force of 11 percent and the strength-to-yield ratio of 1.05-1.08.
Example two:
a duplex stainless steel deformed steel bar for coastal super engineering is provided, the steel grade is S32750, and the steel bar comprises the following components by weight percent: c: 0.016%, Si: 0.49%, Mn: 0.68%, S: 0.0016%, P: 0.034%, Cr: 25.12%, Ni: 6.33%, Mo: 3.60%, N: 0.274%; b: 0.003%; 0.22 percent of Cu; the balance being iron and other unavoidable impurities, and a pitting corrosion resistance equivalent PREN of 41.38.
The preparation process of the duplex stainless steel deformed steel comprises the steps of carrying out deep deoxidation on molten steel, refining outside a furnace, carrying out aluminum deoxidation on a slag surface, deoxidizing by using a silicon-calcium wire and modifying inclusions, controlling the total sum of eight inclusions of the duplex stainless steel deformed steel to be less than or equal to 6.5 grades and the single inclusion to be less than 1.5 grades, carrying out rough rolling on a blank for 4 frames, medium rolling for 6 frames and finish rolling for 6 frames at 1250 ℃, rapidly cooling to below 800 ℃ after finish rolling, wherein in the cooling process, the linear velocity of a product is 8m/s, the length of a water penetrating pipe is 6 meters, and the time of the product passing through the water penetrating pipe is 0.75s, thus obtaining a finished product. The prepared duplex stainless steel deformed steel bar has the yield strength of 750-800MPa, the tensile strength of 900-950MPa, the elongation percentage after fracture of 26-29 percent, the elongation percentage under maximum force of 15.0-17.0 percent and the strength-to-yield ratio of 1.19-1.21.
The mechanical properties are best.
Example three:
a duplex stainless steel deformed steel bar for coastal super engineering is provided, the steel grade is S32750, and the steel bar comprises the following components by weight percent: c: 0.017%, Si: 0.50%, Mn: 0.69%, S: 0.0018%, P: 0.035%, Cr: 25.10%, Ni: 6.45%, Mo: 3.30%, N: 0.266 percent; b: 0.0045 percent; 0.18 percent of Cu; the balance being iron and other unavoidable impurities, and a pitting corrosion resistance equivalent PREN of 40.24.
The preparation process of the duplex stainless steel deformed steel comprises the steps of carrying out deep deoxidation on molten steel, refining outside a furnace, carrying out aluminum deoxidation on a slag surface, deoxidizing by using a silicon-calcium wire and modifying inclusions, controlling the total sum of eight inclusions of the duplex stainless steel deformed steel to be less than or equal to 6.5 grades and the single inclusion to be less than 1.5 grades, carrying out rough rolling on a blank for 4 frames, medium rolling for 6 frames and finish rolling for 6 frames at 1180 ℃, rapidly cooling to below 800 ℃ after finish rolling, wherein in the cooling process, the linear velocity of a product is 8m/s, the length of a water penetrating pipe is 6 meters, and the time of the product passing through the water penetrating pipe is 0.75s, thus obtaining a finished product. The produced duplex stainless steel deformed steel bar has yield strength up to 700MPa, tensile strength up to 850MPa, elongation after fracture of 27-30%, elongation at maximum force of 17.0-18.0%, and yield ratio of 1.21-1.23.
Claims (4)
1. The utility model provides a duplex stainless steel screw-thread steel for coastal super engineering which characterized in that: comprises the following components in percentage by weight: c is less than 0.03%, Si: 0.2-0.6%, Mn: 0.8-1.5%, S is less than or equal to 0.005%, P is less than or equal to 0.035%, Cr: 25.0 to 27.0%, Ni: 6.0-7.0%, Mo: 3.0-4.0%, N: 0.24-0.32%, B: 0.002-0.005%; the balance of iron and other inevitable impurities, and the pitting corrosion resistance equivalent PREN is more than or equal to 41, the yield strength is more than or equal to 700MPa, and the tensile strength is more than or equal to 910 MPa;
the preparation process comprises the steps of deep deoxidation of molten steel, external refining, deoxidation of slag surface aluminum, deoxidation of silicon-calcium wire and modification of inclusions, controlling the total sum of eight inclusions of the duplex stainless steel deformed steel to be less than or equal to 6.5 grade and single inclusion to be less than 1.5 grade, performing rough rolling, intermediate rolling and finish rolling on a blank at 1180-1250 ℃, rapidly cooling to below 800 ℃ after finish rolling to obtain a finished product, preserving heat at 1150 ℃ for 0.5h, and rapidly detecting by water cooling, wherein the volume ratio of ferrite phase reaches 60 percent.
2. The duplex stainless steel screw-thread steel for coastal super engineering according to claim 1, characterized in that: during rolling, 4 rough rolling stands, 6 medium rolling stands and 6 finish rolling stands are adopted.
3. The duplex stainless steel screw-thread steel for coastal super engineering according to claim 1, characterized in that: in the cooling process, the linear velocity of the product is 5-10m/s, the length of the water penetrating pipe is 4-8 m, and the time of the product passing through the water penetrating pipe is 0.4-1 s.
4. The duplex stainless steel screw-thread steel for coastal super engineering according to claim 3, characterized in that: in the cooling process, the linear velocity of the product is 8m/s, the length of the water penetrating pipe is 6 meters, and the time of the product passing through the water penetrating pipe is 0.75 s.
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| CN112779471B true CN112779471B (en) | 2022-03-22 |
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| JP7421420B2 (en) | 2020-05-28 | 2024-01-24 | 丸一ステンレス鋼管株式会社 | duplex stainless steel |
| CN115874017B (en) * | 2022-12-27 | 2024-05-14 | 东北大学 | Method for reducing hot rolling cracks of super duplex stainless steel |
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|---|---|---|---|---|
| CN109022731A (en) * | 2018-08-09 | 2018-12-18 | 江苏星火特钢有限公司 | A kind of high intensity high corrosion resistance two-phase stainless screw-thread steel and its production method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109022731A (en) * | 2018-08-09 | 2018-12-18 | 江苏星火特钢有限公司 | A kind of high intensity high corrosion resistance two-phase stainless screw-thread steel and its production method |
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Effective date of registration: 20231109 Address after: 313009 building 12, No. 1, Fugang Road, Jiuguan Town, Nanxun District, Huzhou City, Zhejiang Province Patentee after: Fubai new material (Zhejiang) Co.,Ltd. Address before: 313011 panjiazhuang Industrial Zone, Jiuguan Town, Nanxun District, Huzhou City, Zhejiang Province Patentee before: HUZHOU SHENGTELONG METAL PRODUCTS Co.,Ltd. |