CN115011874A - Economical trenchless drill rod material and manufacturing method thereof - Google Patents
Economical trenchless drill rod material and manufacturing method thereof Download PDFInfo
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- CN115011874A CN115011874A CN202210588012.5A CN202210588012A CN115011874A CN 115011874 A CN115011874 A CN 115011874A CN 202210588012 A CN202210588012 A CN 202210588012A CN 115011874 A CN115011874 A CN 115011874A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 239000000463 material Substances 0.000 title claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 42
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 35
- 239000010959 steel Substances 0.000 claims abstract description 35
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 11
- 229910052742 iron Inorganic materials 0.000 claims abstract description 9
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 8
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 22
- 238000005096 rolling process Methods 0.000 claims description 14
- 238000005496 tempering Methods 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 6
- 238000010791 quenching Methods 0.000 claims description 6
- 230000000171 quenching effect Effects 0.000 claims description 6
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 claims description 5
- 238000009749 continuous casting Methods 0.000 claims description 5
- 238000005553 drilling Methods 0.000 claims description 5
- 238000007670 refining Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 4
- 230000006698 induction Effects 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 4
- 238000005098 hot rolling Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 7
- 238000005070 sampling Methods 0.000 description 6
- 238000009412 basement excavation Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
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- 238000012360 testing method Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000009863 impact test Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 208000032544 Cicatrix Diseases 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
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- 239000010410 layer Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
- C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
-
- 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
- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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Abstract
The invention relates to an economical trenchless drill rod material and a manufacturing method thereof, wherein a steel pipe comprises the following chemical components in percentage by mass: 0.20-0.25%, Si: 0.20 to 0.30 percent of Mn, 1.05 to 1.20 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, 0.40 to 0.60 percent of Cr, 0.05 to 0.20 percent of Mo, 0.005 to 0.040 percent of Als, and the balance of iron and inevitable impurities. On the basis of comprehensively considering the product performance and the cost, the chemical components, the hot rolling and the heat treatment production process parameters of the trenchless drill rod material are screened and determined, and the lowest production cost is realized on the premise of ensuring that the dimensional precision of the steel pipe meets the processing requirements of users and the product has good mechanical properties.
Description
Technical Field
The invention relates to the technical field of seamless steel pipe production, in particular to an economical trenchless drill rod material and a manufacturing method thereof.
Background
The non-excavation technology is a new construction technology for laying, replacing and repairing various underground pipelines, cables, electric wires and other public facilities under the condition of excavating a tiny part of the ground surface (generally, excavating with small area at an inlet and an outlet) by means of guiding, directional drilling and the like by utilizing various rock-soil drilling equipment. The non-excavation technology originates from the 70 th of the 20 th century and is introduced into China in the 90 th, and because the non-excavation technology does not need to excavate surface layers, the non-excavation technology can penetrate through ground structures, underground pipelines, roads, railways, riverways and the like, a large amount of investment and time are saved, and the non-excavation technology is a real pollution-free and high-efficiency construction technology. Therefore, the method is widely applied to the construction of new pipelines and the repair of old pipelines in the fields of water supply, water drainage, electric power, communication, gas and the like, and can also be applied to the aspects of protection of cultural relics, ancient buildings and the like. With the wide application of trenchless engineering construction techniques, the demand for trenchless drill rods is also expanding rapidly.
The connection mode of the trenchless drill rod basically adopts the mode that a thickened pipe end is connected with a joint through threads or welding. Therefore, the key factors for ensuring the working stability of the trenchless drill rod are the uniformity of wall thickness and mechanical property, and good strength and carbon equivalent matching property. The main technical difficulties in production are as follows: the components of the steel grade are reasonably designed, the mechanical property required by a user is achieved, and the product has high strength and good welding performance.
The Chinese patent with the publication number of CN 110656287B discloses 'a seamless steel tube for a high-strength drill rod and a manufacturing method thereof', which comprises the following components in percentage by mass: 0.22-0.28% of C; 0.45-0.65% of Mn; s is less than or equal to 0.008 percent; p is less than or equal to 0.015 percent; 0.17-0.35% of Si; 0.52 to 0.65 percent of Ni; 0.85-1.00% of Cr; cu is less than or equal to 0.20 percent; 0.50-0.60% of Mo; 0.005-0.040% of Al; 0.02-0.05% of Nb; v is 0.03-0.05%, and the balance is iron and inevitable impurities. The manufacturing process of the seamless steel pipe for the high-strength drill rod comprises the following steps: the tube blank obtained by converter smelting, external refining LF + VD, continuous casting and continuous rolling is heated by a circular furnace, then perforated and subjected to heat treatment after continuous rolling by MPM and PQF. According to the invention, through reasonable chemical composition design, a small amount of alloy elements are added, so that the strength of the steel pipe after heat treatment is greatly improved on the basis of not greatly improving the cost, and the strength reaches 145PSI steel grade. However, the chemical components of the steel pipe contain expensive alloy elements such as Ni, Nb, V and the like, and the production cost is high due to the adoption of the MPM and PQF continuous rolling process.
Disclosure of Invention
The invention provides an economical trenchless drill rod material and a manufacturing method thereof, which screen and determine chemical components, hot rolling and heat treatment production process parameters of the trenchless drill rod material on the basis of comprehensively considering product performance and cost, and realize the minimization of production cost on the premise of ensuring that the dimensional precision of a steel pipe meets the processing requirements of users and the product has good mechanical properties.
In order to achieve the purpose, the invention adopts the following technical scheme:
an economical trenchless drill rod material comprises the following chemical components in percentage by mass: 0.20-0.25%, Si: 0.20 to 0.30 percent of Mn, 1.05 to 1.20 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, 0.40 to 0.60 percent of Cr, 0.05 to 0.20 percent of Mo, 0.005 to 0.040 percent of Als, and the balance of iron and inevitable impurities.
The structure of the finished steel pipe is homogeneous tempered sorbite, and the grain size is 7.0 grade.
The tensile strength of the finished steel pipe is more than or equal to 1000MPa, the yield strength is 931-1138 MPa, and the elongation is more than or equal to 16.0%.
A manufacturing method of an economical trenchless drill rod material comprises the following process steps: the method comprises the following steps of molten iron pretreatment, converter smelting, external refining, square billet continuous casting, continuous rolling, cutting, heating, perforation, oxidation resistance, PQF continuous rolling, pipe removal, heat treatment, micro-tensioning and cooling; wherein:
(1) in the heating procedure, the temperature control of each section is as follows: the first heating section is 1070-1170 ℃, the second heating section is 1145-1235 ℃, the third heating section is 1260-1300 ℃, the soaking section is 1260-1300 ℃, the temperature after perforation is 1190-1240 ℃, and the heating speed is more than or equal to 6.5 min/cm;
(2) the heat treatment process comprises quenching and tempering, and a medium-frequency induction furnace is adopted for heating; the quenching temperature is 860 +/-10 ℃, and the heat preservation time is 20-30 min; the tempering temperature is 520 +/-10 ℃, and the heat preservation time is 30-40 min.
Compared with the prior art, the invention has the beneficial effects that:
on the basis of comprehensively considering product performance and cost, chemical components, hot rolling and heat treatment production process parameters of the trenchless drill rod material are screened and determined, and the lowest production cost is realized on the premise that the dimensional precision of the steel pipe meets the processing requirements of users and the product has good mechanical properties.
Drawings
FIG. 1 is a photograph of the hot rolled metallographic structure of the economical trenchless drill rod material of the present invention.
FIG. 2 is a metallographic structure photograph of the economical trenchless drill rod material of the present invention after hardening and tempering.
Detailed Description
The invention relates to an economical trenchless drill rod material, which comprises the following chemical components in percentage by mass: 0.20-0.25%, Si: 0.20 to 0.30 percent of Mn, 1.05 to 1.20 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, 0.40 to 0.60 percent of Cr, 0.05 to 0.20 percent of Mo, 0.005 to 0.040 percent of Als, and the balance of iron and inevitable impurities.
The structure of the finished steel pipe is homogeneous tempered sorbite, and the grain size is 7.0 grade.
The tensile strength of the finished steel pipe is more than or equal to 1000MPa, the yield strength is 931-1138 MPa, and the elongation is more than or equal to 16.0%.
A manufacturing method of an economical trenchless drill rod material comprises the following process steps: the method comprises the following steps of molten iron pretreatment, converter smelting, external refining, square billet continuous casting, continuous rolling, cutting, heating, perforation, oxidation resistance, PQF continuous rolling, pipe removal, heat treatment, micro-tensioning and cooling; wherein:
(1) in the heating procedure, the temperature control of each section is as follows: the first heating section is 1070 to 1170 ℃, the second heating section is 1145 to 1235 ℃, the third heating section is 1260 to 1300 ℃, the soaking section is 1260 to 1300 ℃, the temperature after perforation is 1190 to 1240 ℃, and the heating speed is more than or equal to 6.5 min/cm;
(2) the heat treatment process comprises quenching and tempering, and a medium-frequency induction furnace is adopted for heating; the quenching temperature is 860 +/-10 ℃, and the heat preservation time is 20-30 min; the tempering temperature is 520 +/-10 ℃, and the heat preservation time is 30-40 min.
Heating is carried out strictly according to a heating system, so that the temperature of the tube blank is ensured to be uniform. Meanwhile, the heating time is strictly controlled, and when the production line is shut down for a short time, the temperature is strictly reduced according to the requirements of technical specifications of the process.
After the invention is tempered, the structure of the invention is tempered sorbite, and the grain size is 7.0 grade. Because a certain amount of elements such as Cr, Mo and the like are added into the steel, the requirements on a heat treatment system are strict, particularly the tempering temperature, so as to ensure the stability of the performance. After tempering, a good and homogeneous tempered sorbite is obtained. The structure crystal grains are fine and uniform, and the quality requirement of high performance is met.
The hot-rolled metallographic structure of the economical trenchless drill rod material is shown in figure 1, and the tempered metallographic structure is shown in figure 2.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples.
[ examples ] A method for producing a compound
In this embodiment, the production process of the economical trenchless drill rod material is as follows:
1. the steel making and rolling process comprises the steps of pretreatment of steel making and iron making water → converter smelting → external refining [ LF + VD/RH) ] → square billet continuous casting → continuous rolling (heating, rolling, finishing) → inspection;
2. the production process of the steel pipe comprises the steps of raw material acceptance → cutting → heating → perforation → antioxidation → PQF continuous rolling → pipe removal → heat treatment → micro-tensioning → cooling → sawing → straightening → air blowing → sampling → flaw detection → inspection → character spraying and identification → packaging and warehousing.
In the embodiment, the chemical components of the economical trenchless drill rod material are shown in table 1, the main control process parameters are shown in table 2, and the mechanical properties are shown in table 3.
TABLE 1 Steel pipe chemical composition (% by mass)
TABLE 2 PQF tandem rolling and Heat treatment Process parameters
TABLE 3 mechanical Properties of the products
The dimensions and tolerances of the steel pipes are shown in Table 4.
TABLE 4 external dimensions and tolerances of steel pipes
The steel pipe straightness deviation or the chord height should accord with the following regulations:
a) for steel pipes with the joint thread major diameter being more than or equal to 4-1/2 inches, the straightness deviation of the steel pipes should not exceed 0.15 percent of the total length of the steel pipes;
b) the maximum sagging amount of the pipe end within a length of 1.5m from the end surface at each end of the steel pipe is 2 mm.
And (4) carrying out heat treatment on the steel pipe blank according to a heat treatment system to prepare a sample, and carrying out longitudinal tensile property detection.
The steel pipes were subjected to a normal temperature longitudinal charpy V-notch impact test, and the requirements for the impact absorption energy values and the actual measurement values in the charpy V-notch impact test are shown in table 5.
TABLE 5 impact absorption energy
The steel pipes were tested non-destructively one by one according to Table 6.
TABLE 6 non-destructive testing
| Inspection item | Inspection method | Acceptance grade | |
| Requirement item | Longitudinal and transverse defects of the inner and outer surfaces | Ultrasonic or magnetic flux leakage test | L4 |
| Example 1 | Longitudinal and transverse defects of the inner and outer surfaces | Ultrasonic or magnetic flux leakage test | Qualified |
| Example 2 | Longitudinal and transverse directions of the inner and outer surfacesLack of | Ultrasonic or magnetic flux leakage test | Qualified |
| Example 3 | Longitudinal and transverse defects of the inner and outer surfaces | Ultrasonic or magnetic flux leakage test | Qualified |
The inner and outer surfaces of the steel pipe are not required to have cracks, folds, scars, roll folds, pits, inner pockmarks and separation layers, if defects exist, the defects are required to be completely removed, and the wall thickness after removal is not required to exceed the required minimum wall thickness.
The sampling quantity, sampling position, sampling method and test method of each inspection of the steel pipe are in accordance with the regulations of table 7.
TABLE 7 number of samples, sampling positions, sampling methods, and test methods
The steel pipe produced by the embodiment tracks the use condition in time through the technical service to the user, the feedback processing performance is good after the user uses the steel pipe, and each technical index meets the design requirement of the trenchless drilling tool.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. The economical trenchless drill rod material is characterized in that a steel pipe comprises the following chemical components in percentage by mass: 0.20-0.25%, Si: 0.20 to 0.30 percent of Mn, 1.05 to 1.20 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, 0.40 to 0.60 percent of Cr, 0.05 to 0.20 percent of Mo, 0.005 to 0.040 percent of Als, and the balance of iron and inevitable impurities.
2. The economical trenchless drilling rod material as claimed in claim 1, wherein the structure of the finished steel pipe is homogeneous tempered sorbite, and the grain size is 7.0 grade.
3. The economical trenchless drill rod material as claimed in claim 1, wherein the tensile strength of the finished steel pipe is more than or equal to 1000MPa, the yield strength is 931-1138 MPa, and the elongation is more than or equal to 16.0%.
4. The method for manufacturing the economic trenchless drilling rod material as claimed in any one of claims 1 to 3, wherein the process comprises the following steps: the method comprises the following steps of molten iron pretreatment, converter smelting, external refining, square billet continuous casting, continuous rolling, cutting, heating, perforation, oxidation resistance, PQF continuous rolling, pipe removal, heat treatment, micro-tensioning and cooling; wherein:
(1) in the heating procedure, the temperature control of each section is as follows: the first heating section is 1070-1170 ℃, the second heating section is 1145-1235 ℃, the third heating section is 1260-1300 ℃, the soaking section is 1260-1300 ℃, the temperature after perforation is 1190-1240 ℃, and the heating speed is more than or equal to 6.5 min/cm;
(2) the heat treatment process comprises quenching and tempering, and a medium-frequency induction furnace is adopted for heating; the quenching temperature is 860 +/-10 ℃, and the heat preservation time is 20-30 min; the tempering temperature is 520 +/-10 ℃, and the heat preservation time is 30-40 min.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210588012.5A CN115011874A (en) | 2022-05-27 | 2022-05-27 | Economical trenchless drill rod material and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210588012.5A CN115011874A (en) | 2022-05-27 | 2022-05-27 | Economical trenchless drill rod material and manufacturing method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104532168A (en) * | 2015-01-09 | 2015-04-22 | 江西理工大学 | High-quality non-quenched and tempered seamless steel tube for drilling and manufacturing method thereof |
| CN109778064A (en) * | 2019-01-11 | 2019-05-21 | 包头钢铁（集团）有限责任公司 | A kind of economical 555MPa grades of seamless steel pipes and preparation method thereof |
| CN110656287A (en) * | 2019-09-30 | 2020-01-07 | 鞍钢股份有限公司 | Seamless steel pipe for high-strength drill rod and manufacturing method thereof |
| CN111455275A (en) * | 2020-04-08 | 2020-07-28 | 鞍钢股份有限公司 | Seamless steel tube for oil-gas well perforating gun and manufacturing method thereof |
| CN113789474A (en) * | 2021-09-14 | 2021-12-14 | 鞍钢股份有限公司 | Economical seamless steel pipe for trenchless drill rod and manufacturing method thereof |
-
2022
- 2022-05-27 CN CN202210588012.5A patent/CN115011874A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104532168A (en) * | 2015-01-09 | 2015-04-22 | 江西理工大学 | High-quality non-quenched and tempered seamless steel tube for drilling and manufacturing method thereof |
| CN109778064A (en) * | 2019-01-11 | 2019-05-21 | 包头钢铁（集团）有限责任公司 | A kind of economical 555MPa grades of seamless steel pipes and preparation method thereof |
| CN110656287A (en) * | 2019-09-30 | 2020-01-07 | 鞍钢股份有限公司 | Seamless steel pipe for high-strength drill rod and manufacturing method thereof |
| CN111455275A (en) * | 2020-04-08 | 2020-07-28 | 鞍钢股份有限公司 | Seamless steel tube for oil-gas well perforating gun and manufacturing method thereof |
| CN113789474A (en) * | 2021-09-14 | 2021-12-14 | 鞍钢股份有限公司 | Economical seamless steel pipe for trenchless drill rod and manufacturing method thereof |
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Application publication date: 20220906 |