CN115522125A - Seamless steel tube containing rare earth 890 MPa-level for crane boom and production method thereof - Google Patents
Seamless steel tube containing rare earth 890 MPa-level for crane boom and production method thereof Download PDFInfo
- Publication number
- CN115522125A CN115522125A CN202211160308.3A CN202211160308A CN115522125A CN 115522125 A CN115522125 A CN 115522125A CN 202211160308 A CN202211160308 A CN 202211160308A CN 115522125 A CN115522125 A CN 115522125A
- Authority
- CN
- China
- Prior art keywords
- percent
- equal
- seamless steel
- less
- rare earth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 33
- 239000010959 steel Substances 0.000 title claims abstract description 33
- 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 11
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 239000000126 substance Substances 0.000 claims abstract description 7
- 239000011573 trace mineral Substances 0.000 claims abstract description 5
- 235000013619 trace mineral Nutrition 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000003723 Smelting Methods 0.000 claims description 2
- 238000009749 continuous casting Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 238000005098 hot rolling Methods 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 238000010791 quenching Methods 0.000 claims description 2
- 230000000171 quenching effect Effects 0.000 claims description 2
- 238000007670 refining Methods 0.000 claims description 2
- 238000004513 sizing Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000005496 tempering Methods 0.000 claims description 2
- 238000009849 vacuum degassing Methods 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 4
- 238000011161 development Methods 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009785 tube rolling Methods 0.000 description 1
- 238000003466 welding 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
- 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
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
-
- 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
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/085—Cooling or quenching
-
- 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
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a seamless steel tube containing rare earth 890MPa grade for a crane boom, which comprises the following chemical components in percentage by mass: 0.12 to 0.16 percent of C; 0.20 to 0.50 percent of Si; 0.90 to 1.10 percent of Mn0; 0.80 to 1.00 percent of Cr0; ni1.10-1.30%; mo0.30-0.60%; v0.03-0.05%; w is less than or equal to 0.80 percent; RE is more than or equal to 0.001 percent; al is less than or equal to 0.050 percent; p is less than or equal to 0.020%; s is less than or equal to 0.010 percent; the balance being Fe and non-removable trace elements. Its preparing process is also disclosed. The yield strength of the steel pipe subjected to heat treatment is more than or equal to 890MPa, the tensile strength is more than or equal to 960MPa, the elongation after fracture is more than or equal to 14%, and the transverse impact energy at minus 40 ℃ is more than or equal to 35J.
Description
Technical Field
The invention relates to the technical field of seamless steel pipe production, in particular to a seamless steel pipe containing rare earth 890MPa grade for a crane boom and a production method thereof.
Background
The crawler crane is an indispensable type in the crane, and has the advantages of small ground pressure, small turning radius, adaptability to severe ground, large climbing capacity, good hoisting performance, no need of landing legs for hoisting operation, various combination modes of arm supports, capability of running with load and the like. The arm support is a main bearing and operating component of the crawler crane, plays roles of supporting, assisting amplitude variation and the like, and plays an important role in the aspects of the safety and the operating capability of the whole crawler crane. The arm support consists of a space truss frame structure and a connecting joint, wherein the chord members and the web members in the space truss structure are all low-alloy high-strength seamless pipes. In the weight of the whole machine, the cantilever crane occupies a larger proportion, and the dead weight of the cantilever crane which is too large seriously limits the lifting capacity of the whole machine. Therefore, indexes such as the self weight of the arm support, the weight of the arm support per unit weight and the like in the design of the arm support of the crawler crane are concerned parts.
In order to improve the hoisting performance and safety of the whole machine and realize the lightweight design requirement of the arm support, the development of the low-alloy high-strength arm support pipe with high strength, high toughness and good welding performance is a necessary choice. With the continuous promotion and successive implementation of the national novel infrastructure construction, the novel urbanization construction and the major engineering construction, the seamless steel tube market for the engineering machinery can show a continuous and good development situation, has huge market potential and development opportunity, and has wide market popularization and application prospects.
Disclosure of Invention
The invention aims to provide a seamless steel tube containing 890MPa grade rare earth for a crane boom and a production method thereof, wherein the yield strength of the steel tube after heat treatment is more than or equal to 890MPa, the tensile strength is more than or equal to 960MPa, the elongation after fracture is more than or equal to 14 percent, the transverse impact energy at minus 40 ℃ is more than or equal to 35J, and the use requirement of the seamless steel tube for the 890MPa grade crane boom can be met.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a rare earth-containing 890 MPa-grade seamless steel tube for a crane boom, which comprises the following chemical components in percentage by mass: 0.12 to 0.16 percent of C; 0.20 to 0.50 percent of Si; 0.90 to 1.10 percent of Mn; 0.80 to 1.00 percent of Cr; 1.10 to 1.30 percent of Ni; mo0.30-0.60%; v0.03-0.05%; w is less than or equal to 0.80 percent; RE is more than or equal to 0.001 percent; al is less than or equal to 0.050 percent; p is less than or equal to 0.020%; s is less than or equal to 0.010 percent; the balance being Fe and non-removable trace elements.
Further, the chemical components comprise the following components in percentage by mass: 0.16 percent of C; 0.30 percent of Si; 1.00 percent of Mn; 0.90 percent of Cr; 1.29 percent of Ni; 0.48 percent of Mo; v0.04%; RE 0.001%; 0.033% of Al; p0.013%; 0.002% of S; the balance being Fe and non-removable trace elements.
A production method of a seamless steel tube containing rare earth 890 MPa-level crane boom uses molten iron and scrap steel as raw materials, and comprises the steps of hot metal pretreatment → top and bottom combined blown converter smelting → LF external refining → VD vacuum degassing → round billet continuous casting to obtain round tube blank, and then heating → perforation → tube rolling → stretch reducing or sizing → cooling of a cooling bed → saw cutting → heat treatment → straightening → flaw detection → manual inspection → length measurement, weighing, mark spraying → warehousing; and (3) hot rolling the round billet into a seamless steel pipe, and carrying out heat treatment quenching and tempering at 920 ℃ and 580-650 ℃ on the whole length of the steel pipe to prepare the seamless steel pipe with various mechanical properties meeting the requirements. .
Compared with the prior art, the invention has the beneficial technical effects that:
the seamless steel tube for the crane jib containing the rare earth 890MPa is excellent in material quality, excellent in performance and reasonable in production technology process, and meets the requirements of steel for high-strength and high-toughness jibs. The yield strength of the steel pipe after heat treatment is more than or equal to 890MPa, the tensile strength is more than or equal to 960MPa, the elongation after fracture is more than or equal to 14 percent, the transverse impact energy at minus 40 ℃ is more than or equal to 35J, and the use requirements of the seamless steel pipe for the 890 MPa-grade crane boom can be met.
Detailed Description
The chemical composition of the steels of the examples is shown in table 1. The heat treatment process of each example is shown in table 2. The mechanical properties of the steel pipes of the examples are shown in Table 3.
TABLE 1 chemical composition of example steels (mass%/%)
TABLE 2 Heat treatment Process for the examples
TABLE 3 mechanical Properties of the steel pipes of the examples
As can be seen from Table 3, the yield strength of the steel pipe after heat treatment in the embodiments 1 and 2 of the application is no less than 890MPa, the tensile strength is no less than 960MPa, the elongation after fracture is no less than 14%, and the transverse impact energy at minus 40 ℃ is no less than 35J, so that the use requirement of the seamless steel pipe for the 890 MPa-grade crane boom can be met.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (3)
1. The seamless steel tube containing the rare earth 890MPa grade for the crane jib is characterized by comprising the following chemical components in percentage by mass: 0.12 to 0.16 percent of C; 0.20 to 0.50 percent of Si; 0.90 to 1.10 percent of Mn; 0.80 to 1.00 percent of Cr; 1.10 to 1.30 percent of Ni; mo0.30-0.60%; v0.03-0.05%; w is less than or equal to 0.80 percent; RE is more than or equal to 0.001 percent; al is less than or equal to 0.050 percent; p is less than or equal to 0.020%; s is less than or equal to 0.010 percent; the balance being Fe and non-removable trace elements.
2. The seamless steel tube containing the rare earth 890MPa grade for the crane jib according to claim 1, wherein the chemical components thereof comprise, by mass: 0.16 percent of C; 0.30 percent of Si; 1.00 percent of Mn; 0.90 percent of Cr; 1.29 percent of Ni; 0.48 percent of Mo; v0.04 percent; RE 0.001%; 0.033% of Al; p0.013%; 0.002% of S; the balance being Fe and non-removable trace elements.
3. The method for producing the seamless steel tube containing the rare earth 890MPa grade crane jib according to claim 1 or 2, characterized in that molten iron and scrap steel are used as raw materials, and the raw materials are subjected to molten iron pretreatment → top-bottom combined blown converter smelting → LF external refining → VD vacuum degassing → round billet continuous casting to obtain a round tube blank, and then the round tube blank is heated → perforated → rolled tube → tension reducing or sizing → cooling bed cooling → sawing → heat treatment → straightening → flaw detection → manual inspection → length measurement, weighing, mark spraying → warehousing; and (3) hot rolling the round billet into a seamless steel pipe, and carrying out heat treatment quenching and tempering at 920 ℃ and 580-650 ℃ on the whole length of the steel pipe to prepare the seamless steel pipe with various mechanical properties meeting the requirements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211160308.3A CN115522125A (en) | 2022-09-22 | 2022-09-22 | Seamless steel tube containing rare earth 890 MPa-level for crane boom and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211160308.3A CN115522125A (en) | 2022-09-22 | 2022-09-22 | Seamless steel tube containing rare earth 890 MPa-level for crane boom and production method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115522125A true CN115522125A (en) | 2022-12-27 |
Family
ID=84699629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211160308.3A Pending CN115522125A (en) | 2022-09-22 | 2022-09-22 | Seamless steel tube containing rare earth 890 MPa-level for crane boom and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115522125A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102747300A (en) * | 2012-06-27 | 2012-10-24 | 攀钢集团成都钢钒有限公司 | Seamless steel pipe for high-strength and high-toughness structure and manufacturing method thereof |
| CN103343293A (en) * | 2013-05-09 | 2013-10-09 | 内蒙古包钢钢联股份有限公司 | Rare earth containing, high strength and high toughness seamless steel pipe used for gas cylinder and production method thereof |
| CN103361558A (en) * | 2013-05-09 | 2013-10-23 | 内蒙古包钢钢联股份有限公司 | Rare-earth-containing wet-H2S-corrosion-resistant T95 steel-grade oil well pipe and production method thereof |
| WO2017050227A1 (en) * | 2015-09-24 | 2017-03-30 | 宝山钢铁股份有限公司 | Seamless steel tube with high strength and toughness and manufacturing method therefor |
| 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 |
-
2022
- 2022-09-22 CN CN202211160308.3A patent/CN115522125A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102747300A (en) * | 2012-06-27 | 2012-10-24 | 攀钢集团成都钢钒有限公司 | Seamless steel pipe for high-strength and high-toughness structure and manufacturing method thereof |
| CN103343293A (en) * | 2013-05-09 | 2013-10-09 | 内蒙古包钢钢联股份有限公司 | Rare earth containing, high strength and high toughness seamless steel pipe used for gas cylinder and production method thereof |
| CN103361558A (en) * | 2013-05-09 | 2013-10-23 | 内蒙古包钢钢联股份有限公司 | Rare-earth-containing wet-H2S-corrosion-resistant T95 steel-grade oil well pipe and production method thereof |
| WO2017050227A1 (en) * | 2015-09-24 | 2017-03-30 | 宝山钢铁股份有限公司 | Seamless steel tube with high strength and toughness and manufacturing method therefor |
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104593669B (en) | Steel for rebar and production method thereof | |
| CN102899575B (en) | Non-quenched and tempered steel used for welding and electroplating hydraulic rod and production method thereof | |
| CN108251747B (en) | Steel pipe for crane boom and manufacturing method thereof | |
| WO2022052335A1 (en) | Thick low-carbon-equivalent high-toughness wear-resistant steel plate and manufacturing method therefor | |
| CN111394653A (en) | 420MPa low-carbon easy-welding marine structural steel plate and manufacturing method thereof | |
| CN105364029B (en) | Thick-wall steel casting solidification structure refining and purifying method and thick-wall steel casting | |
| JP2023542427A (en) | Low-cost, high-performance Q500 bridge steel and production method | |
| CN112779460A (en) | Production method of HRB500E fine-grain high-strength anti-seismic anti-corrosion reinforcing steel bar | |
| CN112375964A (en) | Hot-rolled steel strip for 3.0-6.0mm high-strength welded pipe and production method thereof | |
| CN104946993A (en) | Quenched and tempered state HIC (Hydrogen Induce Crack)-resistant and SSC (Sulfide Stress Cracking)-resistant wide and thick plate and preparation method thereof | |
| CN102534422B (en) | Manufacturing method of corrosion-resistant steel tubes for natural gas conveying pipelines | |
| CN111500920A (en) | HRB600 high-strength anti-seismic deformed steel bar and production method thereof | |
| CN105986190A (en) | High-strength high-toughness pipe for crane boom and manufacturing method for high-strength high-toughness pipe | |
| CN109234487B (en) | Production method of submarine pipeline steel X65MO | |
| CN113637899A (en) | Seamless steel tube containing rare earth for 950 MPa-level engineering machinery and production method thereof | |
| CN115522125A (en) | Seamless steel tube containing rare earth 890 MPa-level for crane boom and production method thereof | |
| CN112301277A (en) | Micro-titanium hypereutectoid steel rail and preparation method thereof | |
| CN113172116B (en) | Preparation method of seamless steel tube, seamless steel tube and drill rod structure | |
| CN106399852A (en) | 840MPa-level hot-rolled anchor rod reinforcing steel bar and production process thereof | |
| CN113265575B (en) | Preparation method of extra-thick Mn-Cr series die steel | |
| CN112813359B (en) | Medium-carbon low-alloy high-strength hydrogen sulfide corrosion-resistant oil well pipe | |
| CN113249637A (en) | Manufacturing method of 50-80 mm-thick medium-plate high-strength steel Q390D | |
| CN113957348A (en) | Steel for long-life hydraulic breaking hammer drill rod and preparation method thereof | |
| CN113278865A (en) | Production method of high-pressure gas cylinder | |
| CN108070791B (en) | High-strength anchor rod for mine reinforcement |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20221227 |