CN115287538A - Rare earth-containing 900 MPa-grade seamless steel tube for trenchless drill rod and preparation method thereof - Google Patents
Rare earth-containing 900 MPa-grade seamless steel tube for trenchless drill rod and preparation method thereof Download PDFInfo
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- CN115287538A CN115287538A CN202210909841.9A CN202210909841A CN115287538A CN 115287538 A CN115287538 A CN 115287538A CN 202210909841 A CN202210909841 A CN 202210909841A CN 115287538 A CN115287538 A CN 115287538A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 40
- 239000010959 steel Substances 0.000 title claims abstract description 40
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 11
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 10
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 230000008569 process Effects 0.000 claims abstract description 25
- 229910052729 chemical element Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 238000009628 steelmaking Methods 0.000 claims abstract description 6
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 238000005096 rolling process Methods 0.000 claims description 26
- 239000002893 slag Substances 0.000 claims description 21
- 238000007670 refining Methods 0.000 claims description 15
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 238000009749 continuous casting Methods 0.000 claims description 12
- 238000010079 rubber tapping Methods 0.000 claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 11
- 238000007664 blowing Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 238000005266 casting Methods 0.000 claims description 8
- 238000003723 Smelting Methods 0.000 claims description 7
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 239000011572 manganese Substances 0.000 claims description 6
- 238000010583 slow cooling Methods 0.000 claims description 6
- 238000009489 vacuum treatment Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 3
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 3
- 229910001309 Ferromolybdenum Inorganic materials 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 claims description 3
- 238000005275 alloying Methods 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 238000009412 basement excavation Methods 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- GSVIBLVMWGSPRZ-UHFFFAOYSA-N cerium iron Chemical compound [Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Ce].[Ce] GSVIBLVMWGSPRZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 claims description 3
- 238000006477 desulfuration reaction Methods 0.000 claims description 3
- 230000023556 desulfurization Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims description 3
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000013021 overheating Methods 0.000 claims description 3
- 230000033764 rhythmic process Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims description 2
- 238000004806 packaging method and process Methods 0.000 claims 1
- 238000009785 tube rolling Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 9
- 238000010276 construction Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 210000001015 abdomen Anatomy 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000005496 tempering Methods 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
-
- 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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
Abstract
The invention discloses a seamless steel tube for a rare earth-containing 900 MPa-grade trenchless drill rod, which comprises the following chemical elements in percentage by mass: 0.24 to 0.30 percent of C; 0.18 to 0.38 percent of Si0; 1.20 to 1.40 percent of Mn1; 0.50 to 0.80 percent of Cr0; mo0.06-0.18%; RE0.002%, and Fe and inevitable impurities as the rest, and its preparation method are also disclosed. The seamless steel tube for the trenchless drill rod is produced by taking low C, mn and Si as the basis, adding Cr, mo and RE elements, and carrying out processes such as steel making, tube rolling and the like, wherein the seamless steel tube for the trenchless drill rod has good inner and outer surface quality and dimensional accuracy meeting the use condition requirements of trenchless drill rod products; intercepting the mechanical property of the small sample after heat treatment: the tensile strength is not less than 793MPa, the yield strength is 724 MPa-931 MPa, the elongation is not less than 14%, and the full-size normal-temperature impact is not less than 54J.
Description
Technical Field
The invention relates to the field of metallurgical materials, in particular to a seamless steel tube for a rare earth-containing 900 MPa-grade trenchless drill rod and a preparation method thereof.
Background
The Trenchless Technology or No-Dig Technology is a construction Technology for detecting, laying, repairing and replacing public pipelines such as water supply, gas, natural gas, sewage, telecommunication cables and the like by utilizing technical means such as rock-soil drilling, directional measurement and control and the like under the condition that No groove is dug on the ground surface and the damage to the stratum structure is extremely small, and is considered as a new environment-friendly construction Technology by the environmental protection agency of the united nations. In the process of urbanization, the trenchless technology is an irreplaceable advanced means, is a necessary technology for carrying out water, gas, electricity, communication and other lifeline engineering construction in urban areas, historic site protection areas, crop or vegetation protection areas and the like, is one of basic technologies which must be mastered in underground space utilization, and the development of the trenchless technology is closely related to the development of cities in the last two decades.
Trenchless techniques have a number of advantages. Firstly, the construction of pipelines does not need to open the pits and break the belly on the road surface and the ground surface, thereby solving the difficult problems which bother the construction engineering of urban underground pipelines for a long time, such as blocking traffic, damaging environment, and influencing the normal life and work order of shops, hospitals, schools and residents. Secondly, the construction speed is high, the comprehensive cost is low, and the economic benefit and the social benefit are better.
At present, the annual demand of non-excavation drill pipes in China is 3-4 ten thousand tons. Due to the important significance of the trenchless technology and the wide market prospect, the development of the trenchless drill rod meets the requirement of market development and can create good economic benefit and social benefit.
Disclosure of Invention
The invention aims to provide a seamless steel tube for a rare earth-containing 900 MPa-grade trenchless drill rod and a preparation method thereof, wherein the seamless steel tube for the trenchless drill rod is produced by adding microalloying of Cr, mo and RE on the basis of low C, mn and Si through processes of steel making, tube rolling processing and the like, the quality of the inner surface and the outer surface is good, the dimensional precision meets the use working condition requirements of the trenchless drill rod product, and the mechanical properties of a cut sample subjected to heat treatment meet the following requirements that the tensile strength is more than or equal to 793MPa, the yield strength is 724-931 MPa, the elongation is more than or equal to 14 percent, and the full-size normal-temperature impact is more than or equal to 54J.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a rare earth-containing 900 MPa-grade seamless steel pipe for a non-excavation drill rod, which comprises the following chemical elements in percentage by mass: 0.24 to 0.30 percent of C; 0.18 to 0.38 percent of Si; 1.20 to 1.40 percent of Mn; 0.50 to 0.80 percent of Cr; mo 0.06-0.18%; RE0.002%, and the balance Fe and inevitable impurities.
Further, the chemical elements and the mass percentage content thereof are as follows: 0.26 percent of C; 0.27% of Si; 1.23 percent of Mn; 0.6342% of Cr; mo 0.096%; RE0.002%, and the balance Fe and inevitable impurities.
A preparation method of a seamless steel pipe containing rare earth for a 900 MPa-level trenchless drill rod comprises the following steps:
the steel-making production process comprises the following steps: molten iron pretreatment → smelting in a top-bottom combined blown converter → LF external refining → VD vacuum treatment → round billet continuous casting → casting blank slow cooling;
converter smelting operation: the final slag alkalinity is controlled according to 3.0; end point control target: c is more than or equal to 0.06 percent, P is less than or equal to 0.010 percent, and the tapping temperature is 1610 to 1630 ℃; the silicon-manganese, ferromanganese and ferrochromium alloy are adopted for deoxidation and alloying, and the final deoxidation process adopts an aluminum deoxidation process; the lower slag amount in the tapping process is strictly controlled, slag must be blocked in the tapping process, and slag must be removed when the slag is blocked; adding a proper amount of lime in the tapping process;
refining in an LF furnace: carrying out slagging desulfurization, component adjustment and heating operation according to the components and the temperature of the molten steel of the converter; blowing argon normally according to requirements in the whole refining process, and controlling the argon blowing intensity; a mode of gradually increasing the temperature rise speed from a low level to a high level is adopted; enhancing the deoxidation operation, and manufacturing white slag, wherein the white slag retention time is more than or equal to 20min; adding ferromolybdenum and supplemented ferrochromium at the later stage of refining; and feeding a proper amount of high-calcium wires before the refining is finished.
Operation of the VD vacuum furnace: 0.002% cerium-iron alloy is added into the VD in-place, the vacuum degree is less than or equal to 0.10KPa, the target value is less than or equal to 0.06KPa, and the deep vacuum time is more than or equal to 13 minutes; the soft blowing time after the vacuum treatment is more than or equal to 13 minutes, and meanwhile, attention should be paid to the weak stirring effect, the molten steel cannot be exposed, and the removal of non-metallic inclusions in the molten steel is well done;
continuous casting of round billets: the baking of the large ladle and the middle ladle is enhanced, and a casting system must be ensured to be clean and dry; the whole process protection pouring and the drawing speed strict control are adopted to ensure the constant drawing speed pouring; controlling the superheat degree of continuous casting molten steel within the range of 15-35 ℃, and controlling the liquidus temperature to be 1505 ℃; adopting crystallizer electromagnetic stirring and tail end electromagnetic stirring processes;
the rolling process comprises the following steps: pipe blank sawing → heating in circular furnace → perforating → continuous rolling → pipe removal → reducing → cooling → sawing → straightening → flaw detection → artificial inspection → length measurement, weighing, label spraying → packing and warehousing → leaving factory
Heating in a ring furnace: heating is carried out according to a specified heating schedule strictly, so that the tube blank is heated uniformly in the heating furnace, and the phenomena of shade and sun surfaces, heat impermeability, overheating or overburning are avoided; when the fault of the rolling mill occurs, strictly executing a temperature reduction system to be rolled;
continuous rolling: the hot tool needs to be measured before use, and a treatment roller way and a guide device need to be checked at any time before rolling and in the rolling process, so that a roller with serious abrasion can be replaced in time; carrying out thermal sampling for checking the geometric dimension once in each batch;
strictly controlling the rolling rhythm; strictly adjusting and monitoring cooling water, and strictly forbidding pouring of the black pipe body; the steel pipe finished product is batched, specified and sized according to a contract; the heating temperature and the rolling process of the steel billet are recorded in detail, and the taken sample is marked.
Compared with the prior art, the invention has the beneficial technical effects that:
according to the invention, through the economic steel grade component design, microalloy elements (particularly rare earth elements) are optimally proportioned, and reasonable steelmaking and rolling processes are adopted, so that the seamless steel tube of the seamless steel tube for the 900 MPa-level trenchless drill rod which can meet complex working conditions of trenchless construction can be produced. Has the advantages of good quality of the inner and outer surfaces, high dimensional accuracy, long service life and the like.
Detailed Description
A seamless steel pipe for a rare earth-containing 900 MPa-grade trenchless drill rod comprises the following chemical elements in percentage by mass: c is 0.24 to 0.30; si 0.18-0.38; 1.20 to 1.40 parts of Mn; p is less than or equal to 0.018; s is less than or equal to 0.010; 0.50 to 0.80 percent of Cr; mo is 0.06-0.18; 0.01 to 0.04 of Al; RE is 0.002, and the balance of Fe and inevitable impurities accounts for 100 percent in mass fraction.
The preparation method comprises the following steps:
1. the steel-making production process comprises the following steps: molten iron pretreatment → smelting in a top-bottom combined blown converter → LF external refining → VD vacuum treatment → round billet continuous casting → casting blank slow cooling;
(1) Converter smelting operation
1. The alkalinity of the final slag is controlled according to 3.0;
2. end point control target: c is more than or equal to 0.06 percent, P is less than or equal to 0.010 percent, and the tapping temperature is 1610 to 1630 ℃;
3. silicon-manganese, ferromanganese and ferrochromium are adopted for deoxidation alloying, and an aluminum deoxidation process is adopted for final deoxidation;
4. the lower slag amount in the tapping process is strictly controlled, slag must be blocked in the tapping process, and slag must be removed when the slag is blocked;
5. proper amount of lime is added in the tapping process.
(2) Refining in LF furnace
1. Carrying out slagging desulfurization, component adjustment and temperature rise operation according to the components and temperature of the molten steel of the converter;
2. blowing argon normally according to requirements in the whole refining process, and controlling the argon blowing intensity;
3. a mode of gradually increasing the temperature rising speed from a low level to a high level is adopted;
4. enhancing the deoxidation operation, and manufacturing white slag, wherein the white slag retention time is more than or equal to 20min;
5. adding ferromolybdenum and supplementing ferrochromium in the late stage of refining;
6. and feeding a proper amount of high-calcium wires before the refining is finished.
(3) VD vacuum furnace operation
1. 0.002% cerium-iron alloy is added in the VD position, the vacuum degree is less than or equal to 0.10KPa, the target value is less than or equal to 0.06KPa, and the deep vacuum time is more than or equal to 13 minutes;
2. the soft blowing time is more than or equal to 13 minutes after the vacuum treatment, and meanwhile, the weak stirring effect is required to be noticed, the molten steel cannot be exposed, and the non-metallic inclusions in the molten steel are removed;
(4) The target value of the water component for continuous casting of steel:
target value (wt%) of water content for continuous casting of steel
(5) Continuous casting of round billets
1. The baking of the large ladle and the middle ladle is enhanced, and a casting system must be ensured to be clean and dry;
2. the whole process protection pouring and the drawing speed strict control are adopted to ensure the constant drawing speed pouring;
3. the superheat degree of the continuous casting molten steel is controlled within the range of 15-35 ℃, and the liquidus temperature is 1505 ℃;
4. adopting crystallizer electromagnetic stirring and tail end electromagnetic stirring processes;
5. the steel has a crack tendency, and the slow cooling work of a casting blank needs to be done, and the slow cooling work is executed strictly according to the slow cooling technical specification of the continuous casting blank.
2. The rolling process comprises the following steps: pipe blank sawing → heating in circular furnace → perforating → continuous rolling → pipe removal → reducing → cooling → sawing → straightening → flaw detection → artificial inspection → length measurement, weighing, label spraying → packing and warehousing → leaving factory
(1) Heating of tube blanks
Heating is carried out according to a specified heating schedule strictly, so that the pipe blank is uniformly heated in a heating furnace, and the phenomena of sunny and shady surfaces, heating impermeability, overheating or overburning are avoided; and when the fault of the rolling mill occurs, strictly executing a temperature reduction system to be rolled.
(2) Rolling of tube blanks
1. The hot tool needs to be measured before use, and a treatment roller way and a guide device need to be checked at any time before rolling and in the rolling process, so that a roller with serious abrasion can be replaced in time;
2. carrying out thermal sampling for checking the geometric dimension once in each batch;
3. strictly controlling the rolling rhythm;
4. strictly adjusting and monitoring cooling water, and strictly forbidding to pour the black pipe body;
5. the steel pipe finished product is batched, specified and sized according to a contract;
6. the heating temperature and the rolling process of the steel billet are recorded in detail, and the taken sample is marked.
According to the chemical composition requirements of tables 1 and 2, the smelting composition is shown in Table 3, and the rolling specification is phi 89mm multiplied by 10mm.
TABLE 1 compositional requirements (wt%)
TABLE 2 content of harmful elements in steel (wt%)
Note: the gas content in the steel is required to be: [H] less than or equal to 2.5ppm, less than or equal to 30ppm of [ O ], and less than or equal to 80ppm of [ N ]. A set of harmful elements and gas components was monitored for each pour. If the standard exceeds the standard, each furnace needs to be supplemented in the casting process.
TABLE 3 melting composition (wt%)
| C | Si | Mn | P | S | Cr | Mo |
| 0.26 | 0.27 | 1.23 | 0.017 | 0.004 | 0.6342 | 0.096 |
A sample heat treatment study is carried out on the rolled pipe, the selected heat treatment system is 890 ℃ quenching (40 min heat preservation), water cooling and 620 ℃ tempering (70 min heat preservation), and air cooling, and the mechanical properties after heat treatment are shown in Table 4.
TABLE 4 mechanical Properties after Heat treatment
The above-described embodiments are only intended to illustrate the preferred embodiments of the present invention, and not to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (3)
1. The utility model provides a contain tombarthite 900MPa level seamless steel pipe for non-excavation drilling rod which characterized in that: the chemical elements and the mass percentage content are as follows: 0.24 to 0.30 percent of C; 0.18 to 0.38 percent of Si; 1.20 to 1.40 percent of Mn; 0.50 to 0.80 percent of Cr; mo 0.06-0.18%; RE0.002%, and the balance Fe and inevitable impurities.
2. The seamless steel pipe for the rare earth-containing 900 MPa-grade trenchless drill rod of claim 1, wherein: the chemical elements and the mass percentage content thereof are as follows: 0.26 percent of C; 0.27 percent of Si; 1.23 percent of Mn; 0.6342% of Cr; mo 0.096%; RE0.002%, and the balance Fe and inevitable impurities.
3. The method for preparing the seamless steel tube for the rare earth-containing 900 MPa-grade trenchless drill rod according to any one of claims 1-2, wherein the method comprises the following steps: the method comprises the following steps:
the steel-making production process comprises the following steps: molten iron pretreatment → smelting in a top-bottom combined blown converter → LF external refining → VD vacuum treatment → round billet continuous casting → casting blank slow cooling;
converter smelting operation: the final slag alkalinity is controlled according to 3.0; end point control target: c is more than or equal to 0.06 percent, P is less than or equal to 0.010 percent, and the tapping temperature is 1610 to 1630 ℃; silicon-manganese, ferromanganese and ferrochromium are adopted for deoxidation alloying, and an aluminum deoxidation process is adopted for final deoxidation; the lower slag amount in the tapping process is strictly controlled, slag must be blocked in the tapping process, and slag must be removed when the slag is blocked; adding a proper amount of lime in the tapping process;
refining in an LF furnace: carrying out slagging desulfurization, component adjustment and heating operation according to the components and the temperature of the molten steel of the converter; blowing argon normally according to requirements in the whole refining process, and controlling the argon blowing intensity; a mode of gradually increasing the temperature rising speed from a low level to a high level is adopted; enhancing the deoxidation operation, and making white slag with the white slag retention time being more than or equal to 20min; adding ferromolybdenum and supplemented ferrochromium at the later stage of refining; and feeding a proper amount of high-calcium wires before the refining is finished.
And (3) VD vacuum furnace operation: 0.002% cerium-iron alloy is added into the VD in-place, the vacuum degree is less than or equal to 0.10KPa, the target value is less than or equal to 0.06KPa, and the deep vacuum time is more than or equal to 13 minutes; the soft blowing time after the vacuum treatment is more than or equal to 13 minutes, and meanwhile, attention should be paid to the weak stirring effect, the molten steel cannot be exposed, and the removal of non-metallic inclusions in the molten steel is well done;
continuous casting of round billets: the baking of the large ladle and the middle ladle is enhanced, and a casting system must be ensured to be clean and dry; the whole process protection pouring and the drawing speed strict control are adopted to ensure the constant drawing speed pouring; controlling the superheat degree of continuous casting molten steel within the range of 15-35 ℃, and controlling the liquidus temperature to be 1505 ℃; adopting crystallizer electromagnetic stirring and tail end electromagnetic stirring processes;
the rolling process comprises the following steps: pipe blank sawing → circular furnace heating → perforating → continuous rolling → pipe release → stretch reducing → cooling → sawing → straightening → flaw detection → artificial inspection → length measurement, weighing, mark spraying → packaging and warehousing → delivery
Heating in a ring furnace: heating is carried out according to a specified heating schedule strictly, so that the pipe blank is uniformly heated in a heating furnace, and the phenomena of sunny and shady surfaces, heating impermeability, overheating or overburning are avoided; when a fault occurs in the rolling mill, strictly executing a cooling system to be rolled;
continuous rolling: the hot tool must be measured before use, and a treatment roller way and a guide device should be checked at any time before rolling and in the rolling process, so that the roller with serious abrasion can be replaced in time; carrying out thermal sampling for checking the geometric dimension once in each batch;
strictly controlling the rolling rhythm; strictly adjusting and monitoring cooling water, and strictly forbidding to pour the black pipe body; the steel pipe finished product is batched, specified and sized according to a contract; the heating temperature and the rolling process of the steel billet are recorded in detail, and the taken sample is marked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210909841.9A CN115287538A (en) | 2022-07-29 | 2022-07-29 | Rare earth-containing 900 MPa-grade seamless steel tube for trenchless drill rod and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210909841.9A CN115287538A (en) | 2022-07-29 | 2022-07-29 | Rare earth-containing 900 MPa-grade seamless steel tube for trenchless drill rod and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN115287538A true CN115287538A (en) | 2022-11-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210909841.9A Pending CN115287538A (en) | 2022-07-29 | 2022-07-29 | Rare earth-containing 900 MPa-grade seamless steel tube for trenchless drill rod and preparation method thereof |
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| CN (1) | CN115287538A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112756423A (en) * | 2020-12-11 | 2021-05-07 | 包头钢铁（集团）有限责任公司 | Rare earth-containing seamless steel tube for key bar of rotary drilling rig and preparation method thereof |
| CN113637899A (en) * | 2021-07-16 | 2021-11-12 | 包头钢铁（集团）有限责任公司 | Seamless steel tube containing rare earth for 950 MPa-level engineering machinery and production method thereof |
| CN113637895A (en) * | 2021-07-07 | 2021-11-12 | 包头钢铁（集团）有限责任公司 | Rare earth-containing 850 MPa-grade seamless steel pipe for engineering machinery and production method thereof |
| CN114086056A (en) * | 2021-10-21 | 2022-02-25 | 包头钢铁（集团）有限责任公司 | Rare earth-containing seamless steel tube special for bearing axle under low-temperature working condition and manufacturing method thereof |
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2022
- 2022-07-29 CN CN202210909841.9A patent/CN115287538A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112756423A (en) * | 2020-12-11 | 2021-05-07 | 包头钢铁（集团）有限责任公司 | Rare earth-containing seamless steel tube for key bar of rotary drilling rig and preparation method thereof |
| CN113637895A (en) * | 2021-07-07 | 2021-11-12 | 包头钢铁（集团）有限责任公司 | Rare earth-containing 850 MPa-grade seamless steel pipe for engineering machinery and production method thereof |
| CN113637899A (en) * | 2021-07-16 | 2021-11-12 | 包头钢铁（集团）有限责任公司 | Seamless steel tube containing rare earth for 950 MPa-level engineering machinery and production method thereof |
| CN114086056A (en) * | 2021-10-21 | 2022-02-25 | 包头钢铁（集团）有限责任公司 | Rare earth-containing seamless steel tube special for bearing axle under low-temperature working condition and manufacturing method thereof |
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