CN117385290A - Production and processing technology of low-temperature profile steel - Google Patents
Production and processing technology of low-temperature profile steel Download PDFInfo
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- CN117385290A CN117385290A CN202311245390.4A CN202311245390A CN117385290A CN 117385290 A CN117385290 A CN 117385290A CN 202311245390 A CN202311245390 A CN 202311245390A CN 117385290 A CN117385290 A CN 117385290A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 207
- 239000010959 steel Substances 0.000 title claims abstract description 207
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000012545 processing Methods 0.000 title claims abstract description 17
- 238000005516 engineering process Methods 0.000 title claims abstract description 12
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 78
- 238000007664 blowing Methods 0.000 claims abstract description 43
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 40
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 40
- 239000001301 oxygen Substances 0.000 claims abstract description 40
- 229910052786 argon Inorganic materials 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 36
- 239000012535 impurity Substances 0.000 claims abstract description 25
- 238000003756 stirring Methods 0.000 claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 15
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 13
- 239000011593 sulfur Substances 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 146
- 229910052742 iron Inorganic materials 0.000 claims description 72
- 238000009749 continuous casting Methods 0.000 claims description 65
- 238000005096 rolling process Methods 0.000 claims description 38
- 238000001816 cooling Methods 0.000 claims description 34
- 238000005266 casting Methods 0.000 claims description 28
- 238000006477 desulfuration reaction Methods 0.000 claims description 28
- 230000023556 desulfurization Effects 0.000 claims description 28
- 239000002893 slag Substances 0.000 claims description 23
- 238000007670 refining Methods 0.000 claims description 22
- 239000003795 chemical substances by application Substances 0.000 claims description 17
- 229910001309 Ferromolybdenum Inorganic materials 0.000 claims description 16
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims description 16
- 230000003009 desulfurizing effect Effects 0.000 claims description 16
- 230000007547 defect Effects 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000002791 soaking Methods 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 9
- 238000005498 polishing Methods 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 238000007254 oxidation reaction Methods 0.000 claims description 6
- 230000001590 oxidative effect Effects 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 229910014813 CaC2 Inorganic materials 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 claims description 5
- 238000005098 hot rolling Methods 0.000 claims description 5
- 210000001161 mammalian embryo Anatomy 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims 1
- 230000003647 oxidation Effects 0.000 claims 1
- 239000007921 spray Substances 0.000 claims 1
- 229910052782 aluminium Inorganic materials 0.000 abstract description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 2
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 239000002245 particle Substances 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 230000001276 controlling effect Effects 0.000 description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- 229910052593 corundum Inorganic materials 0.000 description 5
- 238000009628 steelmaking Methods 0.000 description 5
- 229910001845 yogo sapphire Inorganic materials 0.000 description 5
- 238000002156 mixing Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 238000013459 approach Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/009—Continuous casting of metals, i.e. casting in indefinite lengths of work of special cross-section, e.g. I-beams, U-profiles
-
- 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
- C21C7/0006—Adding metallic additives
-
- 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
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- 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
- C22C33/06—Making ferrous alloys by melting using master 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
- C22C38/02—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
- C22C38/18—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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to the technical field of metallurgy, and discloses low-temperature profile steel, which comprises the following chemical components in percentage by mass: the invention also provides a low-temperature section steel production and processing technology, which ensures that the sulfur content in the low-temperature section steel is lower than 0.003 percent, cracks are avoided caused by separation of crystalline particles of metal in the section steel, the section steel is not easy to rust, the fatigue resistance of the section steel can be ensured, the oxygen content in molten steel is kept below 40ppm, the molten steel is subjected to bottom blowing argon stirring in the whole process, the argon blowing stirring treatment time is kept to be 15-20min, al2O3 impurities larger than 20 mu m in the molten steel are basically completely removed, the influence of aluminum impurities on the preparation process of the section steel can be avoided, and the integral influence of the aluminum impurities on the section steel can be avoided.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a low-temperature section steel production and processing technology.
Background
The H-shaped steel for the low-temperature resistant structure is mainly applied to buildings, ships, bridges, power station equipment, water conservancy, energy sources, chemical industry, hoisting and transportation machinery and other steel structural members with higher loads in alpine regions, the steel is few in mixed nonmetallic materials, the low-temperature resistant structure has the characteristic of impact resistance under the low-temperature condition, and the technical means for ensuring the low-temperature impact toughness of the low-temperature shaped steel mainly comprises two approaches: the method is characterized in that fine grain strengthening is realized through controlled rolling and cooling in the steel rolling process, the purpose of guaranteeing low-temperature impact toughness is achieved, the purpose of high low-temperature impact toughness is achieved through adding alloy components such as nickel, molybdenum and the like which guarantee low-temperature impact toughness, the two approaches have obvious defects, the controlled rolling and cooling fine grain strengthening process is very difficult to control in production, the requirement on a rolling mill is high, the temperature control is difficult to realize, the qualification rate is low, meanwhile, the influence on the production rhythm is large, and the method is not suitable for continuous batch production.
Aiming at the defects of the prior art, the invention provides a low-temperature section steel production and processing technology, which has the advantages of high low-temperature resistance, good low-temperature impact toughness and the like.
Disclosure of Invention
In order to achieve the purposes of high low temperature resistance and good low temperature impact toughness, the invention provides the following technical scheme:
the low-temperature profile steel comprises the following chemical components in percentage by mass:
0.05-0.28% of C, 0.6-2.3% of Mn, 8.5-9.5% of Ni, 0.001-0.003% of S, 0.15-0.25% of Cr, 0.02-0.08% of Mo, 0.03-0.06% of Nb, 0.008-0.016% of Ti, 0.15-0.3% of Si, and the balance of iron and impurities.
The low-temperature profile steel comprises the following chemical components in percentage by mass: v0.02-0.04%, P0.008-0.01%.
The invention also provides a low-temperature section steel production and processing technology, wherein the low-temperature section steel is prepared by the following steps:
s1, molten iron treatment: desulfurizing agent is added into the hot metal ladle to carry out desulfurization treatment, the sulfur content of the molten iron is controlled below 0.015wt%, and slag on the surface of the molten iron is scraped after the desulfurization is finished;
s2, converter smelting: adding molten iron uniformly mixed by a mixer into a converter, adopting an oxygen top-bottom combined blowing method to make steel by the oxygen top-bottom combined blowing converter, and simultaneously adding a deoxidizer into the molten steel to deoxidize;
s3, LF refining: maintaining the oxygen content in the molten steel below 40ppm, performing bottom argon blowing stirring on the molten steel in the whole process, adding ferromolybdenum and ferrotitanium in the later refining stage, adjusting the Mo content in the molten steel, and adjusting the Ti content in the molten steel;
s4, continuously casting the special-shaped embryo: semi-protection casting is adopted for continuous casting, so that a continuous casting blank with good surface and no crack defect is obtained;
s5, hot rolling and forming: slowly cooling the continuous casting billet obtained after continuous casting, heating the continuous casting billet, soaking, rough rolling and finish rolling the continuous casting billet, and controlling the final rolling temperature; naturally cooling the rolled piece, and then immediately cooling to obtain hot rolled section steel;
s6, section steel treatment: and (3) correcting, cutting, polishing and rust-preventing protection are carried out on the prepared hot rolled profile steel.
According to the technical characteristics, in the step S1, a desulfurizing agent is specifically added into a hot metal ladle for desulfurization treatment, the desulfurization treatment time is kept at 25-30min, the sulfur content of molten iron is controlled below 0.015wt%, slag on the surface of the molten iron is scraped after desulfurization is finished, wherein the desulfurizing agent is specifically Mg, caC2 and CaO, and the adding ratio of the Mg, the CaC2 and the CaO is 5:12:22 in percentage by mass.
According to the technical characteristics, the step S2 is specifically that molten iron in a plurality of molten iron tanks is added into a blast furnace mixer, the molten iron components and the uniform temperature are mixed, the mixed molten iron is added into a converter, an oxygen top-bottom combined blowing method is adopted, oxygen with the purity of more than 99% is adopted to make steel making of the molten iron by a top-bottom combined blowing converter, oxygen directly reacts with high-temperature molten iron to carry out oxidation reaction, impurities are removed, and simultaneously deoxidizing agent is added into the molten steel to deoxidize, so that the tapping temperature of the molten steel reaches more than 1600 ℃.
According to the technical characteristics, the step S3 is specifically that the oxygen content in the molten steel is kept below 40ppm, the molten steel is subjected to bottom argon blowing stirring in the whole process, the argon blowing stirring treatment time is kept at 15-20min, al2O3 impurities larger than 20 mu m in the molten steel are basically removed completely, ferromolybdenum and ferrotitanium are added in the later stage of refining, then the Mo content in the molten steel is adjusted, the Ti content in the molten steel is adjusted, and 90-95% of oxidizing slag is removed through slag skimming.
According to the technical characteristics, in the step S3, after ferromolybdenum and ferrotitanium are added into molten steel in the later stage of refining, the content of Mo in the molten steel is specifically adjusted to 0.02-0.08wt%, and the content of Ti in the molten steel is specifically adjusted to 0.008-0.016wt%.
According to the technical characteristics, the step S4 is specifically that the continuous casting adopts protection casting, argon is slowly filled into a cavity before casting, air in the cavity is replaced, argon with the pressure of more than or equal to 0.3MPa is filled into a pipe during casting, contact between molten steel injection flow and the atmosphere is isolated, a continuous casting blank with good surface and no crack defect is obtained, and the free O2 content of the filled argon is less than or equal to 1%.
According to the technical characteristics, the step S5 is specifically that after the continuous casting billet obtained after continuous casting is slowly cooled, the continuous casting billet is heated to 1200-1250 ℃ and soaked, and after rough rolling and finish rolling, the final rolling temperature is controlled to be 860-900 ℃; and naturally cooling the rolled piece to 700-750 ℃, and then immediately cooling the rolled piece to obtain the hot rolled section steel.
According to the technical characteristics, the step S6 is specifically that the manufactured hot rolled steel is measured, the hot rolled steel is corrected by using a correcting machine, the hot rolled steel is cut according to the requirements, the cut part of the hot rolled steel is polished, and the surface of the hot rolled steel is sprayed with an antirust treatment liquid for antirust protection.
Compared with the prior art, the invention provides a low-temperature section steel production and processing technology, which has the following beneficial effects:
1. the process ensures that the sulfur content in the low-temperature section steel is lower than 0.003 percent, avoids cracks caused by separation of crystalline particles of metal in the section steel, also ensures that the section steel cannot generate thermal brittleness, ensures that the produced section steel is not easy to rust, and simultaneously ensures the fatigue resistance of the section steel;
2. according to the invention, in the refining process, the oxygen content in the molten steel is kept below 40ppm, the molten steel is subjected to bottom argon blowing stirring in the whole process, and the argon blowing stirring treatment time is kept to be 15-20min, so that Al2O3 impurities larger than 20 mu m in the molten steel are basically removed completely, the influence of aluminum impurities on the preparation process of the profile steel can be avoided, the aluminum impurities can be prevented from being mixed in the profile steel, and the integral strength of the profile steel is also prevented from being influenced.
3. The low-temperature section steel prepared by the process has good low-temperature resistance, ensures the impact resistance of the low-temperature section steel in a low-temperature state, also ensures the toughness of the low-temperature section steel in a low-temperature environment, has a smooth and flat rolling surface without burrs, and has the external rust-proof protection performance.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention.
In the drawings:
fig. 1 is a schematic flow chart of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
Example 1: the invention provides a technical scheme, namely low-temperature section steel, which comprises the following chemical components in percentage by mass:
0.13% of C, 1.6% of Mn, 9.0% of Ni, 0.002% of S, 0.20% of Cr, 0.05% of Mo, 0.04% of Nb, 0.012% of Ti, 0.22% of Si, and the balance of Fe and impurities.
The low-temperature profile steel comprises the following chemical components in percentage by mass: v0.03%, P0.009%.
A low-temperature section steel production and processing technology comprises the following steps:
s1, molten iron treatment: desulfurizing agent is added into the hot metal ladle to carry out desulfurization treatment, the sulfur content of the molten iron is controlled below 0.015wt%, and slag on the surface of the molten iron is scraped after the desulfurization is finished;
s2, converter smelting: adding molten iron uniformly mixed by a mixer into a converter, adopting an oxygen top-bottom combined blowing method to make steel by the oxygen top-bottom combined blowing converter, and simultaneously adding a deoxidizer into the molten steel to deoxidize;
s3, LF refining: maintaining the oxygen content in the molten steel below 40ppm, performing bottom argon blowing stirring on the molten steel in the whole process, adding ferromolybdenum and ferrotitanium in the later refining stage, adjusting the Mo content in the molten steel, and adjusting the Ti content in the molten steel;
s4, continuously casting the special-shaped embryo: semi-protection casting is adopted for continuous casting, so that a continuous casting blank with good surface and no crack defect is obtained;
s5, hot rolling and forming: slowly cooling a continuous casting billet obtained after continuous casting, heating the continuous casting billet, soaking, rough rolling and finish rolling the continuous casting billet, and controlling the final rolling temperature; naturally cooling the rolled piece, and then immediately cooling to obtain hot rolled section steel;
s6, section steel treatment: and (3) correcting, cutting, polishing and rust-preventing protection are carried out on the prepared hot rolled profile steel.
Step S1 is to add a desulfurizing agent into a hot metal ladle for desulfurization treatment, wherein the desulfurization treatment time is kept at 30min, the sulfur content of molten iron is controlled below 0.015wt%, slag on the surface of the molten iron is scraped after desulfurization is finished, the desulfurizing agent is Mg, caC2 and CaO, and the addition ratio of the Mg, the CaC2 and the CaO is 5:12:22 in percentage by mass.
And S2, adding molten iron in a plurality of molten iron tanks into a mixer furnace, uniformly mixing molten iron components and uniform temperature, adding the uniformly mixed molten iron into a converter, adopting an oxygen top-bottom combined blowing method, adopting oxygen with purity of more than 99% to perform top-bottom combined blowing converter steelmaking on the molten iron, enabling the oxygen to directly perform oxidation reaction with the high-temperature molten iron, removing impurities, and simultaneously adding a deoxidizer into the molten steel to deoxidize, so that the tapping temperature of the molten steel reaches more than 1600 ℃.
And S3, specifically, keeping the oxygen content in the molten steel below 40ppm, carrying out bottom argon blowing stirring on the molten steel in the whole process, keeping the argon blowing stirring treatment time at 20min, basically removing Al2O3 impurities larger than 20 mu m in the molten steel, adding ferromolybdenum and ferrotitanium in the later stage of refining, adjusting the Mo content in the molten steel, adjusting the Ti content in the molten steel, and removing 95% of oxidizing slag through slag skimming.
In the step S3, after ferromolybdenum and ferrotitanium are added into molten steel in the later stage of refining, the content of Mo in the molten steel is specifically adjusted to 0.05wt percent, and the content of Ti in the molten steel is specifically adjusted to 0.012wt percent.
And S4, the continuous casting is performed by adopting protection casting, argon is slowly filled into a cavity before casting, air in the cavity is replaced, argon with the pressure of more than or equal to 0.3MPa is filled into a pipe during casting, contact between molten steel injection flow and the atmosphere is isolated, and a continuous casting blank with good surface and no crack defect is obtained, and the free O2 content of the filled argon is less than or equal to 1%.
Step S5, after slowly cooling the continuous casting billet obtained after continuous casting, heating the continuous casting billet to 1250 ℃, soaking, and after rough rolling and finish rolling, controlling the final rolling temperature to 870 ℃; and naturally cooling the rolled piece to 730 ℃, and then immediately cooling the rolled piece to obtain the hot rolled section steel.
And S6, specifically, measuring the prepared hot rolled steel section, correcting the hot rolled steel section by using a correcting machine, cutting the hot rolled steel section according to requirements, polishing the cut part of the hot rolled steel section, and spraying antirust treatment liquid on the surface of the hot rolled steel section for antirust protection.
Example 2: the invention provides a technical scheme, namely low-temperature section steel, which comprises the following chemical components in percentage by mass:
0.05% of C, 0.6% of Mn, 9.5% of Ni, 0.003% of S, 0.15% of Cr, 0.02% of Mo, 0.06% of Nb, 0.008% of Ti, 0.15% of Si, and the balance of iron and impurities.
The low-temperature profile steel comprises the following chemical components in percentage by mass: v0.04%, P0.01%.
A low-temperature section steel production and processing technology comprises the following steps:
s1, molten iron treatment: desulfurizing agent is added into the hot metal ladle to carry out desulfurization treatment, the sulfur content of the molten iron is controlled below 0.015wt%, and slag on the surface of the molten iron is scraped after the desulfurization is finished;
s2, converter smelting: adding molten iron uniformly mixed by a mixer into a converter, adopting an oxygen top-bottom combined blowing method to make steel by the oxygen top-bottom combined blowing converter, and simultaneously adding a deoxidizer into the molten steel to deoxidize;
s3, LF refining: maintaining the oxygen content in the molten steel below 40ppm, performing bottom argon blowing stirring on the molten steel in the whole process, adding ferromolybdenum and ferrotitanium in the later refining stage, adjusting the Mo content in the molten steel, and adjusting the Ti content in the molten steel;
s4, continuously casting the special-shaped embryo: semi-protection casting is adopted for continuous casting, so that a continuous casting blank with good surface and no crack defect is obtained;
s5, hot rolling and forming: slowly cooling a continuous casting billet obtained after continuous casting, heating the continuous casting billet, soaking, rough rolling and finish rolling the continuous casting billet, and controlling the final rolling temperature; naturally cooling the rolled piece, and then immediately cooling to obtain hot rolled section steel;
s6, section steel treatment: and (3) correcting, cutting, polishing and rust-preventing protection are carried out on the prepared hot rolled profile steel.
Step S1 is to add a desulfurizing agent into a hot metal ladle for desulfurization treatment, wherein the desulfurization treatment time is kept at 25min, the sulfur content of molten iron is controlled below 0.015wt%, slag on the surface of the molten iron is scraped after desulfurization is finished, the desulfurizing agent is Mg, caC2 and CaO, and the addition ratio of the Mg, the CaC2 and the CaO is 5:12:22 in percentage by mass.
And S2, adding molten iron in a plurality of molten iron tanks into a mixer furnace, uniformly mixing molten iron components and uniform temperature, adding the uniformly mixed molten iron into a converter, adopting an oxygen top-bottom combined blowing method, adopting oxygen with purity of more than 99% to perform top-bottom combined blowing converter steelmaking on the molten iron, enabling the oxygen to directly perform oxidation reaction with the high-temperature molten iron, removing impurities, and simultaneously adding a deoxidizer into the molten steel to deoxidize, so that the tapping temperature of the molten steel reaches more than 1600 ℃.
And S3, specifically, keeping the oxygen content in the molten steel below 40ppm, carrying out bottom argon blowing stirring on the molten steel in the whole process, keeping the argon blowing stirring treatment time to be 15-20min, basically removing Al2O3 impurities larger than 20 mu m in the molten steel, adding ferromolybdenum and ferrotitanium in the later stage of refining, then adjusting the Mo content in the molten steel, adjusting the Ti content in the molten steel, and removing 90% of oxidizing slag through slag skimming.
In the step S3, after ferromolybdenum and ferrotitanium are added into molten steel in the later stage of refining, the content of Mo in the molten steel is specifically regulated to 0.02wt%, and the content of Ti in the molten steel is specifically regulated to 0.008wt%.
And S4, the continuous casting is performed by adopting protection casting, argon is slowly filled into a cavity before casting, air in the cavity is replaced, argon with the pressure of more than or equal to 0.3MPa is filled into a pipe during casting, contact between molten steel injection flow and the atmosphere is isolated, and a continuous casting blank with good surface and no crack defect is obtained, and the free O2 content of the filled argon is less than or equal to 1%.
Step S5, after slowly cooling the continuous casting billet obtained after continuous casting, heating the continuous casting billet to 1200 ℃, soaking, rough rolling and finish rolling the continuous casting billet, and controlling the final rolling temperature to be 860 ℃; and naturally cooling the rolled piece to 700 ℃, and then immediately cooling the rolled piece to obtain the hot rolled section steel.
And S6, specifically, measuring the prepared hot rolled steel section, correcting the hot rolled steel section by using a correcting machine, cutting the hot rolled steel section according to requirements, polishing the cut part of the hot rolled steel section, and spraying antirust treatment liquid on the surface of the hot rolled steel section for antirust protection.
Example 3: the invention provides a technical scheme, namely low-temperature section steel, which comprises the following chemical components in percentage by mass:
0.28% of C, 2.3% of Mn, 8.5% of Ni, 0.003% of S, 0.25% of Cr, 0.08% of Mo, 0.06% of Nb, 0.016% of Ti, 0.15% of Si, and the balance of Fe and impurities.
The low-temperature profile steel comprises the following chemical components in percentage by mass: v0.04%, P0.01%.
A low-temperature section steel production and processing technology comprises the following steps:
s1, molten iron treatment: desulfurizing agent is added into the hot metal ladle to carry out desulfurization treatment, the sulfur content of the molten iron is controlled below 0.015wt%, and slag on the surface of the molten iron is scraped after the desulfurization is finished;
s2, converter smelting: adding molten iron uniformly mixed by a mixer into a converter, adopting an oxygen top-bottom combined blowing method to make steel by the oxygen top-bottom combined blowing converter, and simultaneously adding a deoxidizer into the molten steel to deoxidize;
s3, LF refining: maintaining the oxygen content in the molten steel below 40ppm, performing bottom argon blowing stirring on the molten steel in the whole process, adding ferromolybdenum and ferrotitanium in the later refining stage, adjusting the Mo content in the molten steel, and adjusting the Ti content in the molten steel;
s4, continuously casting the special-shaped embryo: semi-protection casting is adopted for continuous casting, so that a continuous casting blank with good surface and no crack defect is obtained;
s5, hot rolling and forming: slowly cooling a continuous casting billet obtained after continuous casting, heating the continuous casting billet, soaking, rough rolling and finish rolling the continuous casting billet, and controlling the final rolling temperature; naturally cooling the rolled piece, and then immediately cooling to obtain hot rolled section steel;
s6, section steel treatment: and (3) correcting, cutting, polishing and rust-preventing protection are carried out on the prepared hot rolled profile steel.
Step S1 is to add a desulfurizing agent into a hot metal ladle for desulfurization treatment, wherein the desulfurization treatment time is kept at 28min, the sulfur content of molten iron is controlled below 0.015wt%, slag on the surface of the molten iron is scraped after desulfurization is finished, the desulfurizing agent is Mg, caC2 and CaO, and the addition ratio of the Mg, the CaC2 and the CaO is 5:12:22 in percentage by mass.
And S2, adding molten iron in a plurality of molten iron tanks into a mixer furnace, uniformly mixing molten iron components and uniform temperature, adding the uniformly mixed molten iron into a converter, adopting an oxygen top-bottom combined blowing method, adopting oxygen with purity of more than 99% to perform top-bottom combined blowing converter steelmaking on the molten iron, enabling the oxygen to directly perform oxidation reaction with the high-temperature molten iron, removing impurities, and simultaneously adding a deoxidizer into the molten steel to deoxidize, so that the tapping temperature of the molten steel reaches more than 1600 ℃.
And S3, specifically, keeping the oxygen content in the molten steel below 40ppm, carrying out bottom argon blowing stirring on the molten steel in the whole process, keeping the argon blowing stirring treatment time to be 15-20min, basically removing Al2O3 impurities larger than 20 mu m in the molten steel, adding ferromolybdenum and ferrotitanium in the later stage of refining, then adjusting the Mo content in the molten steel, adjusting the Ti content in the molten steel, and removing 90% of oxidizing slag through slag skimming.
In the step S3, after ferromolybdenum and ferrotitanium are added into molten steel in the later stage of refining, the content of Mo in the molten steel is specifically regulated to 0.08wt%, and the content of Ti in the molten steel is specifically regulated to 0.016wt%.
And S4, the continuous casting is performed by adopting protection casting, argon is slowly filled into a cavity before casting, air in the cavity is replaced, argon with the pressure of more than or equal to 0.3MPa is filled into a pipe during casting, contact between molten steel injection flow and the atmosphere is isolated, and a continuous casting blank with good surface and no crack defect is obtained, and the free O2 content of the filled argon is less than or equal to 1%.
Step S5, after slowly cooling the continuous casting billet obtained after continuous casting, heating the continuous casting billet to 1200 ℃, soaking, rough rolling and finish rolling the continuous casting billet, and controlling the final rolling temperature to be 860 ℃; and naturally cooling the rolled piece to 700 ℃, and then immediately cooling the rolled piece to obtain the hot rolled section steel.
And S6, specifically, measuring the prepared hot rolled steel section, correcting the hot rolled steel section by using a correcting machine, cutting the hot rolled steel section according to requirements, polishing the cut part of the hot rolled steel section, and spraying antirust treatment liquid on the surface of the hot rolled steel section for antirust protection.
By combining the above examples, the produced low-temperature section steel was tested, and the results are shown in the following table:
working principle: the mass percentages adopted are as follows: 0.05-0.28% of C, 0.6-2.3% of Mn, 8.5-9.5% of Ni, 0.001-0.003% of S, 0.15-0.25% of Cr, 0.02-0.08% of Mo, 0.03-0.06% of Nb, 0.008-0.016% of Ti, 0.15-0.3% of Si and the balance of iron and impurities, and the prepared low-temperature profile steel has low-temperature resistance, and particularly comprises the following components in percentage by mass: 0.13% of C, 1.6% of Mn, 9.0% of Ni, 0.002% of S, 0.20% of Cr, 0.05% of Mo, 0.04% of Nb, 0.012% of Ti, 0.22% of Si, and the balance of iron and impurities, the impact toughness of the low-temperature profile steel is good at low temperature;
when the low-temperature section steel is prepared, firstly, desulfurizing agents with the mass percentages of 5:12:22Mg, caC2 and CaO are added into a hot metal ladle for desulfurization treatment, the desulfurization treatment time is kept at 25-30min, the sulfur content of molten iron is controlled below 0.015wt%, and slag on the surface of the molten iron is scraped after desulfurization is finished;
adding molten iron in a plurality of molten iron tanks into a mixer furnace, uniformly mixing molten iron components and uniform temperature, adding the uniformly mixed molten iron into a converter, adopting an oxygen top-bottom combined blowing method, adopting oxygen with purity of more than 99% to carry out top-bottom combined blowing converter steelmaking on the molten iron, enabling the oxygen to directly carry out oxidation reaction with the high-temperature molten iron, removing impurities, and simultaneously adding deoxidizer into molten steel to deoxidize, so that the tapping temperature of the molten steel reaches more than 1600 ℃;
maintaining the oxygen content in the molten steel below 40ppm, performing bottom argon blowing stirring on the molten steel in the whole process, maintaining the argon blowing stirring treatment time to be 15-20min, basically removing Al2O3 impurities larger than 20 mu m in the molten steel, adding ferromolybdenum and ferrotitanium in the later stage of refining, adjusting the Mo content in the molten steel to 0.02-0.08wt%, adjusting the Ti content in the molten steel to 0.008-0.016wt%, and removing 90-95% of oxidizing slag through slag skimming;
then adopting protection casting to carry out continuous casting, slowly filling argon into the cavity before casting to replace air in the cavity, and when casting, filling argon with the pressure of more than or equal to 0.3MPa into the pipe to isolate the contact between molten steel injection flow and the atmosphere, so as to obtain a continuous casting blank with good surface and no crack defect, wherein the free O2 content of the filled argon is less than or equal to 1%;
slowly cooling the continuous casting billet obtained after continuous casting, heating the continuous casting billet to 1200-1250 ℃, soaking the continuous casting billet, rough rolling and finish rolling the continuous casting billet, controlling the final rolling temperature to be between 860 and 900 ℃, naturally cooling rolled pieces to 700-750 ℃, and immediately cooling the rolled pieces to obtain hot rolled section steel;
and finally, measuring the prepared hot rolled steel, correcting the hot rolled steel by using a correcting machine, cutting the hot rolled steel according to the requirements, polishing the cut part of the hot rolled steel, and spraying antirust treatment liquid on the surface of the hot rolled steel for antirust protection.
Finally, it should be noted that: the foregoing is merely a preferred example of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The low-temperature profile steel comprises the following chemical components in percentage by mass:
0.05-0.28% of C, 0.6-2.3% of Mn, 8.5-9.5% of Ni, 0.001-0.003% of S, 0.15-0.25% of Cr, 0.02-0.08% of Mo, 0.03-0.06% of Nb, 0.008-0.016% of Ti, 0.15-0.3% of Si, and the balance of iron and impurities.
2. The low-temperature section steel according to claim 1, wherein the low-temperature section steel further comprises the following chemical components in percentage by mass: v0.02-0.04%, P0.008-0.01%.
3. A low-temperature section steel production and processing technology comprises the following steps:
s1, molten iron treatment: desulfurizing agent is added into the hot metal ladle to carry out desulfurization treatment, the sulfur content of the molten iron is controlled below 0.015wt%, and slag on the surface of the molten iron is scraped after the desulfurization is finished;
s2, converter smelting: adding molten iron uniformly mixed by a mixer into a converter, adopting an oxygen top-bottom combined blowing method to make steel by the oxygen top-bottom combined blowing converter, and simultaneously adding a deoxidizer into the molten steel to deoxidize;
s3, LF refining: maintaining the oxygen content in the molten steel below 40ppm, performing bottom argon blowing stirring on the molten steel in the whole process, adding ferromolybdenum and ferrotitanium in the later refining stage, adjusting the Mo content in the molten steel, and adjusting the Ti content in the molten steel;
s4, continuously casting the special-shaped embryo: semi-protection casting is adopted for continuous casting, so that a continuous casting blank with good surface and no crack defect is obtained;
s5, hot rolling and forming: slowly cooling the continuous casting billet obtained after continuous casting, heating the continuous casting billet, soaking, rough rolling and finish rolling the continuous casting billet, and controlling the final rolling temperature; naturally cooling the rolled piece, and then immediately cooling to obtain hot rolled section steel;
s6, section steel treatment: and (3) correcting, cutting, polishing and rust-preventing protection are carried out on the prepared hot rolled profile steel.
4. The process for producing and processing the low-temperature profile steel according to claim 3, wherein in the step S1, a desulfurizing agent is added into a hot metal ladle for desulfurization treatment, the desulfurization treatment time is kept at 25-30min, the sulfur content of molten iron is controlled below 0.015wt%, slag on the surface of the molten iron is scraped after desulfurization is finished, the desulfurizing agent is Mg, caC2 and CaO, and the adding ratio of the Mg, the CaC2 and the CaO is 5:12:22 in percentage by mass.
5. The process for manufacturing and processing low-temperature profile steel according to claim 3, wherein the step S2 is specifically to add molten iron in a plurality of hot metal tanks into a hot metal mixer, mix the components and the uniform temperature of the molten iron, add the mixed molten iron into a converter, make steel by top-bottom combined blowing of molten iron by oxygen top-bottom combined blowing method, make oxygen directly react with high-temperature molten iron by oxidation, remove impurities, and add deoxidizer into molten steel to deoxidize, so that the tapping temperature of molten steel reaches above 1600 ℃.
6. The process for producing and processing low-temperature profile steel according to claim 3, wherein the step S3 is characterized in that the oxygen content in the molten steel is kept below 40ppm, the molten steel is subjected to bottom argon blowing stirring in the whole process, the argon blowing stirring treatment time is kept to be 15-20min, al2O3 impurities larger than 20 μm in the molten steel are basically removed, ferromolybdenum and ferrotitanium are added in the later stage of refining, then the Mo content in the molten steel is adjusted, the Ti content in the molten steel is adjusted, and 90-95% of oxidizing slag is removed through slag skimming.
7. The process according to claim 6, wherein in the step S3, after adding ferromolybdenum and ferrotitanium to the molten steel in the later stage of refining, the Mo content in the molten steel is specifically adjusted to 0.02-0.08wt%, and the Ti content in the molten steel is specifically adjusted to 0.008-0.016wt%.
8. The low-temperature section steel production and processing technology according to claim 3, wherein the step S4 is characterized in that protection casting is adopted in continuous casting, argon is slowly filled into a cavity before casting, air in the cavity is replaced, argon with the pressure of more than or equal to 0.3MPa is filled into a pipe during casting, contact between a molten steel injection flow and the atmosphere is isolated, a continuous casting blank with good crack defect-free surface is obtained, and the free O2 content of the filled argon is less than or equal to 1%.
9. The process for manufacturing and processing low-temperature profile steel according to claim 3, wherein the step S5 is specifically performed by slowly cooling the continuous casting billet obtained after continuous casting, heating the continuous casting billet to 1200-1250 ℃, soaking, rough rolling and finish rolling the continuous casting billet, and controlling the final rolling temperature to be 860-900 ℃; and naturally cooling the rolled piece to 700-750 ℃, and then immediately cooling the rolled piece to obtain the hot rolled section steel.
10. The process for manufacturing and processing the low-temperature section steel according to claim 3, wherein the step S6 is specifically to measure the manufactured hot-rolled section steel, rectify the hot-rolled section steel by using a rectification machine, cut the hot-rolled section steel according to the requirement, polish the cut part of the hot-rolled section steel, and spray antirust treatment liquid on the surface of the hot-rolled section steel for antirust protection.
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| CN105586534A (en) * | 2016-02-22 | 2016-05-18 | 山东钢铁股份有限公司 | Ultra-thick hot-rolled H-shaped steel with low ductile-brittle transition temperature and production method thereof |
| CN106011627A (en) * | 2016-07-05 | 2016-10-12 | 南阳汉冶特钢有限公司 | Quenched and tempered high-strength alloy steel 06Ni9DR steel plate used for ultralow-temperature pressure container and preparation method of quenched and tempered high-strength alloy steel 06Ni9DR steel plate |
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