CN112077537A - Preparation method of large-caliber stainless steel JCOE welded pipe - Google Patents
Preparation method of large-caliber stainless steel JCOE welded pipe Download PDFInfo
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Abstract
The invention discloses a preparation method of a large-caliber stainless steel JCOE welded pipe, which comprises the following steps: a. detecting raw materials; b. milling edges; c. pre-bending edges; forming JCO; e. shaping and prewelding; f. welding inside and outside; g. degreasing; h. solution heat treatment; i. cold expanding; j. flaw detection of the tube blank; k. pipe end machining; acid pickling and passivating; and m, checking and discharging finished products. By the mode, the preparation method of the large-caliber stainless steel JCOE welded pipe realizes a full-automatic control technology in the whole production line, can produce large-caliber stainless steel JCOE welded pipes of various types, various specifications and various batches, improves the production efficiency and ensures the quality of pipes.
Description
Technical Field
The invention relates to the field of stainless steel pipe manufacturing, in particular to a preparation method of a large-caliber stainless steel JCOE welded pipe.
Background
With the unprecedented development of the economy of various countries and the construction of oil and gas transmission pipelines all over the world, the demand of large-diameter stainless steel longitudinal submerged arc welded pipes is increasing day by day. The large-diameter stainless steel longitudinal submerged arc welded pipe can be widely applied to the fields of marine oil and gas exploitation, LNG natural gas, seawater desalination, petrifaction, nuclear power and the like. And with the increasing corrosion resistance, weather resistance and conveying pressure of pipelines, the pipeline steel pipes have a trend towards large caliber, thick wall and high strength.
JCOE is a longitudinal seam double-sided submerged arc welded pipe, and the longitudinal seam steel pipe can be divided into a high-frequency longitudinal seam steel pipe and a submerged arc welded longitudinal seam steel pipe JCOE steel pipe according to the production process. Submerged arc welded straight slit steel pipes are further classified into UOE, RBE, JCOE, LSAW steel pipes, etc. according to their different forming methods. The production technology of UOE, RBE and LSAW steel pipes has the defects of low production efficiency, high cost and the like, and the JCOE steel pipe has the advantages of simple production process, high production efficiency and low cost.
At present, the development progress of the large-caliber stainless steel JCOE welded pipe and the preparation method thereof in China is relatively lagged behind, especially the caliber of the welded pipe for conveying oil gas tends to be large-sized day by day, and the JCOE welded pipe with the large caliber can not meet the requirement of localization of the large-caliber stainless steel JCOE welded pipe no matter the type, the specification or the quantity. Therefore, the invention provides a large-caliber stainless steel JCOE welded pipe to overcome the defects of the prior art.
Disclosure of Invention
The invention mainly solves the technical problem of providing a method for preparing large-caliber stainless steel JCOE welded pipes, the whole production line realizes a full-automatic control technology, and large-caliber stainless steel JCOE welded pipes with various varieties, specifications and batches can be produced, the production efficiency is improved, and the quality of pipes is ensured.
In order to solve the technical problems, the invention adopts a technical scheme that: the preparation method of the large-caliber stainless steel JCOE welded pipe comprises the following steps: a. raw material detection: carrying out full-plate ultrasonic inspection on a raw steel plate, and carrying out formal numbering on qualified loaded steel plates; b. edge milling: milling the edge of the groove of the steel plate, and discharging scrap iron generated by milling through a chip removal device; the shape of the groove is I-shaped, and when the thickness of the steel plate is less than or equal to 8mm, the gap of the groove is 0.05-0.2 mm; the shape of the groove is Y-shaped, the gap of the groove is 0.05-0.2mm, the truncated edge is 3-6mm, and the angle of the groove is 50-65 degrees; the thickness of the steel plate is more than or equal to 10mm and less than 35mm, the groove gap is 0.05-0.2mm, the truncated edge is 3-6mm, and the groove angle is 60-70 degrees; the shape of the groove is X-shaped, the thickness of the steel plate is more than or equal to 35mm, the gap c of the groove is 0.05-0.2mm, the truncated edge is 3-6mm, and the angle of the groove is 50-65 degrees; the shape of the groove is double V-shaped, when the thickness of the steel plate is more than or equal to 20mm, the gap of the groove is 0.05-0.2mm, the truncated edge is 3-6mm, and the angle of the groove is 60-70 degrees; the thickness of the steel plate is more than or equal to 25mm, the groove gap is 0.05-0.2mm, the truncated edge is 3-6mm, and the groove angle is 50-65 degrees; when the thickness of the steel plate is more than or equal to 30mm, the groove gap is 0.05-0.2mm, the truncated edge is 3-6mm, and the groove angle is 60-70 degrees; c. pre-bending edges: gradually bending two sides of the steel plate respectively to ensure that the curvature of the plate edges is the same as that of the formed pipe body so as to ensure that the roundness of the final steel pipe is in a standard range; JCO forming: performing multi-pass stepping on JCO forming pressure equipment to punch one half of the steel plate into a J shape, then similarly bending the other half of the steel plate into a C shape in the same way, and finally pressing the plate blank into an open O-shaped pipe blank in the middle of the plate blank; e. shaping and prewelding: pre-welding the tube blank after seaming the tube blank with a welding machine; f. welding inside and outside: adopting longitudinal four-wire submerged arc welding to respectively weld the inner part and the outer part of the tube blank; g. degreasing: immersing the tube blank into a degreasing solution, flatly placing the tube blank in the degreasing solution and staying for 30 minutes to 1 hour, wherein the tube blank needs to be rotated for multiple times in the whole process; h. solution heat treatment: heating the tube blank in a box furnace to ensure that the whole inside and outside of the tube blank are heated uniformly, wherein the temperature of the solution heat treatment is 1080 +/-10-1220 +/-10 ℃, and the time is not less than 2 hours; i. cold expanding: expanding the whole length of the tube blank to improve the dimensional accuracy of the steel tube and improve the distribution state of stress in the steel tube when the tube blank is in a state close to normal temperature, and expanding the whole length of the steel tube by 0.5-1.2% in an expanding process to finally obtain the steel tube; j. flaw detection of the tube blank: the steel pipes are inspected one by one on a hydrostatic testing machine to ensure that the pipe blanks reach the testing pressure required by the standard; carrying out X-ray industrial television inspection and pipe end weld shooting on the steel pipe to detect whether the pipe blank weld is qualified or not; k. pipe end machining: processing the pipe end of the steel pipe which is qualified through inspection to reach the required pipe end groove size; acid pickling passivation: immersing the steel pipe into an acid washing cylinder for acid washing; pickling for 1-2 hours at room temperature; checking the acid washing condition, and washing with water; m, finished product inspection and ex-warehouse: and inspecting the finished steel pipe, correspondingly testing the performance of the steel pipe, marking and packaging the finished steel pipe, and warehousing the packaged product.
In a preferred embodiment of the present invention, the thickness of the raw steel plate in step a is 8-35mm, and the material of the steel plate is 304, 321 or 32750 dual-phase steel.
In a preferred embodiment of the present invention, in the stamping process of step d, 25-29 stamping steps are adopted, and the single stamping amount is 180-.
In a preferred embodiment of the present invention, in the step f, the thickness of the plate is 10-12mm, the diameter of the welding wire is 2.4mm, the current is 320-400A, the voltage is 28-36V, and the welding speed is 42-55 cm/min; the thickness of the plate is 12-14mm, the diameter of the welding wire is 2.4mm, the current is 320-400A, the voltage is 32-38V, and the welding speed is 42-55 cm/min; the thickness of the plate is more than 14mm, the diameter of the welding wire is 4mm, the current is 400-600A, the voltage is 32-38V, and the welding speed is 42-65 cm/min.
In a preferred embodiment of the invention, the wall thickness of the tube blank in the step h is less than 25.4mm, and the heat preservation time is 2 hours; the thickness of the tube blank is more than 25.4mm, and the heat preservation time is 4.8 minutes.
In a preferred embodiment of the invention, the wall thickness of the m-grade finished steel pipe is 8mm, the diameter of the m-grade finished steel pipe is 406mm, and the material of the m-grade finished steel pipe is 304; or the wall thickness of the finished steel pipe is 35mm, the diameter is 762mm, and the material is 321; or the wall thickness of the finished steel pipe is 20mm, the diameter of the finished steel pipe is 1219mm, and the finished steel pipe is 32750 dual-phase steel.
The invention has the beneficial effects that: the method for preparing the large-caliber stainless steel JCOE welded pipe realizes a full-automatic control technology in the whole production line, can produce various, multi-specification and multi-batch large-caliber stainless steel JCOE welded pipes, improves the production efficiency and ensures the quality of the pipe.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a flow chart of a preparation method of a preferred embodiment of the preparation method of the large-caliber stainless steel JCOE welded pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1, the wall thickness of the steel pipe was 8mm, the diameter of the steel pipe was phi 406mm, and the material of the steel was 304.
The key process steps of the preparation method comprise:
1. and a plate UT: adopting a steel plate with the thickness of 14mm, and carrying out full-plate ultrasonic inspection after the steel plate for manufacturing the large-caliber submerged arc welding straight seam steel pipe enters a production line; the steel plates which are qualified and loaded are formally numbered, so that an operator can conveniently track the steel plates;
2. edge milling: milling the groove shape of the steel plate into a Y shape, wherein the groove gap is 0.05-0.2mm, the truncated edge is 3-6mm, and the groove angle is 50-65 degrees; discharging scrap iron generated by milling through a chip removal device;
3. pre-bending edges: and respectively bending two sides of the steel plate step by step. The curvature of the plate edge is the same as that of the formed pipe body, so that the roundness of the final steel pipe is ensured to be within a standard range;
JCO forming: performing multi-pass stepping stamping on JCO forming pressure equipment to form a J shape, then similarly bending the other side of the steel plate to form a C shape in the same way, and finally pressing the plate blank into an open O-shaped tube blank in the middle of the plate blank;
5. shaping and prewelding: pre-welding the formed pipe barrel after seam jointing by a pre-welding machine to ensure that the internal and external welding can be normally carried out;
6. external welding: adopting longitudinal four-wire submerged-arc welding to weld the pipe blank; the diameter of the welding wire is phi 2.4mm, the current is 320-400A, the voltage is 32-38V, and the welding speed is 42-55 cm/min;
7. degreasing: immersing the steel pipe into a degreasing solution, flatly placing the pipeline in the degreasing solution, staying for 30 minutes to 1 hour, and rotating for two to three times in the whole process;
8. solution heat treatment: the temperature is controlled to be 1080-1220 +/-10 ℃, and the heat preservation time is two hours; the inside and outside of the stainless steel tube body heated in the box type furnace are heated uniformly; if the client has other stabilized temperature and time requirements, the method is executed according to the client requirements;
9. hydrostatic test or X-ray flaw detection or real-time imaging detection: carrying out inspection on the expanded steel pipes one by one on a hydrostatic testing machine so as to ensure that the steel pipes reach the testing pressure required by the standard; carrying out X-ray industrial television inspection and pipe end weld shooting or real-time imaging detection on the steel pipe;
10. expanding the diameter: expanding the whole length of the steel pipe to improve the dimensional accuracy of the steel pipe and improve the distribution state of the stress in the steel pipe;
11. pipe end machining: processing the pipe end of the steel pipe which is qualified through inspection to reach the required pipe end groove size;
12. acid pickling and passivation: immersing the steel pipe into an acid washing cylinder for acid washing; pickling for 1-2 hours at room temperature; checking the acid washing condition, and washing with water;
13. and (4) inspecting a finished product: inspecting the finished steel pipe, and correspondingly testing the performance of the steel pipe;
14. marking: identifying the product;
15. packaging: packaging the product;
16. warehousing: and warehousing the packaged product.
The yield strength of the material of this example was 310 MPa.
Example 2: the wall thickness of the steel pipe is 20mm, the diameter of the steel pipe is phi 762mm, and the material of the steel is 321.
The key process steps of the preparation method comprise:
1. and a plate UT: adopting a steel plate with the thickness of 35mm, and carrying out full-plate ultrasonic inspection after the steel plate for manufacturing the large-caliber submerged arc welding straight seam steel pipe enters a production line; the steel plates which are qualified and loaded are formally numbered, so that an operator can conveniently track the steel plates;
2. edge milling: milling the groove shape of the steel plate into a double V shape, wherein the groove gap is 0.05-0.2mm, the truncated edge is 3-6mm, and the groove angle is 60-70 degrees; discharging scrap iron generated by milling through a chip removal device;
3. pre-bending edges: and respectively bending two sides of the steel plate step by step. The curvature of the plate edge is the same as that of the formed pipe body, so that the roundness of the final steel pipe is ensured to be within a standard range;
JCO forming: performing multi-pass stepping stamping on JCO forming pressure equipment to form a J shape, then similarly bending the other side of the steel plate to form a C shape in the same way, and finally pressing the plate blank into an open O-shaped tube blank in the middle of the plate blank;
5. shaping and prewelding: pre-welding the formed pipe barrel after seam jointing by a pre-welding machine to ensure that the internal and external welding can be normally carried out;
6. welding inside and outside: adopting longitudinal four-wire submerged arc welding to weld the inner side of the steel pipe; the diameter of the welding wire is phi 4mm, the current is 400-600A, the voltage is 32-38V, and the welding speed is 42-65 cm/min; adopting longitudinal four-wire submerged-arc welding to weld the pipe blank; the diameter of the welding wire is phi 4mm, the current is 400-600A, the voltage is 32-38V, and the welding speed is 42-65 cm/min;
7. degreasing: immersing the steel pipe into a degreasing solution, flatly placing the pipeline in the degreasing solution, staying for 30 minutes to 1 hour, and rotating for two to three times in the whole process;
8. solution heat treatment: the temperature is controlled to be 1080-1220 +/-10 ℃, and the heat preservation time is two hours; the inside and outside of the stainless steel tube body heated in the box type furnace are heated uniformly; if the client has other stabilized temperature and time requirements, the method is executed according to the client requirements;
9. hydrostatic test or X-ray flaw detection or real-time imaging detection: carrying out inspection on the expanded steel pipes one by one on a hydrostatic testing machine so as to ensure that the steel pipes reach the testing pressure required by the standard; carrying out X-ray industrial television inspection and pipe end weld shooting on the steel pipe;
10. expanding the diameter: expanding the whole length of the steel pipe to improve the dimensional accuracy of the steel pipe and improve the distribution state of the stress in the steel pipe;
11. pipe end machining: processing the pipe end of the steel pipe which is qualified through inspection to reach the required pipe end groove size;
12. acid pickling and passivation: immersing the steel pipe into an acid washing cylinder for acid washing; pickling for 1-2 hours at room temperature; checking the acid washing condition, and washing with water;
13. and (4) inspecting a finished product: inspecting the finished steel pipe, and correspondingly testing the performance of the steel pipe;
14. marking: identifying the product;
15. packaging: packaging the product;
16. warehousing: and warehousing the packaged product.
The yield strength of the material of this example was 206 MPa.
Example 3: the wall thickness of the steel pipe is 35mm, the diameter of the steel pipe is phi 1219mm, and the steel material is 32750 dual-phase steel.
The key process steps of the preparation method comprise:
1. and a plate UT: adopting a steel plate with the thickness of 35mm, and carrying out full-plate ultrasonic inspection after the steel plate for manufacturing the large-caliber submerged arc welding straight seam steel pipe enters a production line; the steel plates which are qualified and loaded are formally numbered, so that an operator can conveniently track the steel plates;
2. edge milling: milling the groove shape of the steel plate into an X shape according to the requirements of customers, wherein the groove gap is 0.05-0.2mm, the truncated edge is 3-6mm, and the groove angle is 50-65 degrees; discharging scrap iron generated by milling through a chip removal device;
3. pre-bending edges: and respectively bending two sides of the steel plate step by step. The curvature of the plate edge is the same as that of the formed pipe body, so that the roundness of the final steel pipe is ensured to be within a standard range;
JCO forming: performing multi-pass stepping stamping on JCO forming pressure equipment to form a J shape, then similarly bending the other side of the steel plate to form a C shape in the same way, and finally pressing the plate blank into an open O-shaped tube blank in the middle of the plate blank;
5. shaping and prewelding: pre-welding the formed pipe barrel after seam jointing by a pre-welding machine to ensure that the internal and external welding can be normally carried out;
6. welding inside and outside: adopting longitudinal four-wire submerged arc welding to weld the inner side of the steel pipe; the diameter of the welding wire is phi 4mm, the current is 400-600A, the voltage is 32-38V, and the welding speed is 42-65 cm/min; adopting longitudinal four-wire submerged-arc welding to weld the pipe blank; the diameter of the welding wire is phi 4mm, the current is 400-600A, the voltage is 32-38V, and the welding speed is 42-65 cm/min;
7. degreasing: immersing the steel pipe into a degreasing solution, flatly placing the pipeline in the degreasing solution, staying for 30 minutes to 1 hour, and rotating for two to three times in the whole process;
8. solution heat treatment: the temperature is controlled to be 1080-1220 +/-10 ℃, and the heat preservation time is 165 minutes; the inside and outside of the stainless steel tube body heated in the box type furnace are heated uniformly; if the client has other stabilized temperature and time requirements, the method is executed according to the client requirements;
9. hydrostatic test or X-ray flaw detection or real-time imaging detection: carrying out inspection on the expanded steel pipes one by one on a hydrostatic testing machine so as to ensure that the steel pipes reach the testing pressure required by the standard; carrying out X-ray industrial television inspection and pipe end weld shooting on the steel pipe;
10. expanding the diameter: expanding the whole length of the steel pipe to improve the dimensional accuracy of the steel pipe and improve the distribution state of the stress in the steel pipe;
11. pipe end machining: processing the pipe end of the steel pipe which is qualified through inspection to reach the required pipe end groove size;
12. acid pickling and passivation: immersing the steel pipe into an acid washing cylinder for acid washing; pickling for 1-2 hours at room temperature; checking the acid washing condition, and washing with water;
13. and (4) inspecting a finished product: inspecting the finished steel pipe, and correspondingly testing the performance of the steel pipe;
14. marking: identifying the product;
15. packaging: packaging the product;
16. warehousing: and warehousing the packaged product.
The yield strength of the material of this example was 550 MPa.
The method is different from the prior art and the full-automatic control technology is realized in the whole production line, and the large-caliber stainless steel JCOE welded pipe with multiple varieties, multiple specifications and multiple batches can be produced, so that the production efficiency is improved, and the quality of the pipe is ensured.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. A preparation method of a large-caliber stainless steel JCOE welded pipe is characterized by comprising the following steps:
a. raw material detection: carrying out full-plate ultrasonic inspection on a raw steel plate, and carrying out formal numbering on qualified loaded steel plates;
b. edge milling: milling the edge of the groove of the steel plate, and discharging scrap iron generated by milling through a chip removal device; the shape of the groove is I-shaped, and when the thickness of the steel plate is less than or equal to 8mm, the gap of the groove is 0.05-0.2 mm; the shape of the groove is Y-shaped, the gap of the groove is 0.05-0.2mm, the truncated edge is 3-6mm, and the angle of the groove is 50-65 degrees; the thickness of the steel plate is more than or equal to 10mm and less than 35mm, the groove gap is 0.05-0.2mm, the truncated edge is 3-6mm, and the groove angle is 60-70 degrees; the shape of the groove is X-shaped, the thickness of the steel plate is more than or equal to 35mm, the gap c of the groove is 0.05-0.2mm, the truncated edge is 3-6mm, and the angle of the groove is 50-65 degrees; the shape of the groove is double V-shaped, when the thickness of the steel plate is more than or equal to 20mm, the gap of the groove is 0.05-0.2mm, the truncated edge is 3-6mm, and the angle of the groove is 60-70 degrees; the thickness of the steel plate is more than or equal to 25mm, the groove gap is 0.05-0.2mm, the truncated edge is 3-6mm, and the groove angle is 50-65 degrees; when the thickness of the steel plate is more than or equal to 30mm, the groove gap is 0.05-0.2mm, the truncated edge is 3-6mm, and the groove angle is 60-70 degrees;
c. pre-bending edges: gradually bending two sides of the steel plate respectively to ensure that the curvature of the plate edges is the same as that of the formed pipe body so as to ensure that the roundness of the final steel pipe is in a standard range;
JCO forming: performing multi-pass stepping on JCO forming pressure equipment to punch one half of the steel plate into a J shape, then similarly bending the other half of the steel plate into a C shape in the same way, and finally pressing the plate blank into an open O-shaped pipe blank in the middle of the plate blank;
e. shaping and prewelding: pre-welding the tube blank after seaming the tube blank with a welding machine;
f. welding inside and outside: adopting longitudinal four-wire submerged arc welding to respectively weld the inner part and the outer part of the tube blank;
g. degreasing: immersing the tube blank into a degreasing solution, flatly placing the tube blank in the degreasing solution and staying for 30 minutes to 1 hour, wherein the tube blank needs to be rotated for multiple times in the whole process;
h. solution heat treatment: heating the tube blank in a box furnace to ensure that the whole inside and outside of the tube blank are heated uniformly, wherein the temperature of the solution heat treatment is 1080 +/-10-1220 +/-10 ℃, and the time is not less than 2 hours;
i. cold expanding: expanding the whole length of the tube blank to improve the dimensional accuracy of the steel tube and improve the distribution state of stress in the steel tube when the tube blank is in a state close to normal temperature, and expanding the whole length of the steel tube by 0.5-1.2% in an expanding process to finally obtain the steel tube;
j. flaw detection of the tube blank: the steel pipes are inspected one by one on a hydrostatic testing machine to ensure that the pipe blanks reach the testing pressure required by the standard; carrying out X-ray industrial television inspection and pipe end weld shooting on the steel pipe to detect whether the pipe blank weld is qualified or not;
k. pipe end machining: processing the pipe end of the steel pipe which is qualified through inspection to reach the required pipe end groove size;
acid pickling passivation: immersing the steel pipe into an acid washing cylinder for acid washing; pickling for 1-2 hours at room temperature; checking the acid washing condition, and washing with water;
m, finished product inspection and ex-warehouse: and inspecting the finished steel pipe, correspondingly testing the performance of the steel pipe, marking and packaging the finished steel pipe, and warehousing the packaged product.
2. The method for preparing the large-caliber stainless steel JCOE welded pipe according to claim 1, wherein the thickness of the raw steel plate in the step a is 8-35mm, and the material of the steel plate is 304, 321 or 32750 dual-phase steel.
3. The method for preparing a large-caliber stainless steel JCOE welded pipe as claimed in claim 1, wherein in the stamping process of the step d, the stamping times of 25-29 steps are adopted, and the single reduction is 180-190 mm.
4. The method for preparing a large-caliber stainless steel JCOE welded pipe as claimed in claim 1, wherein in the step f, the thickness of the plate is 10-12mm, the diameter of the welding wire is 2.4mm, the current is 320-400A, the voltage is 28-36V, and the welding speed is 42-55 cm/min; the thickness of the plate is 12-14mm, the diameter of the welding wire is 2.4mm, the current is 320-400A, the voltage is 32-38V, and the welding speed is 42-55 cm/min; the thickness of the plate is more than 14mm, the diameter of the welding wire is 4mm, the current is 400-600A, the voltage is 32-38V, and the welding speed is 42-65 cm/min.
5. The method for preparing the large-caliber stainless steel JCOE welded pipe according to claim 1, wherein the wall thickness of the pipe blank in the step h is less than 25.4mm, and the heat preservation time is 2 hours; the thickness of the tube blank is more than 25.4mm, and the heat preservation time is 4.8 minutes.
6. The method for preparing a large-caliber stainless steel JCOE welded pipe according to claim 1, wherein the wall thickness of the m-medium-sized finished steel pipe is 8mm, the diameter of the m-medium-sized finished steel pipe is 406mm, and the material of the m-medium-sized finished steel pipe is 304; or the wall thickness of the finished steel pipe is 35mm, the diameter is 762mm, and the material is 321; or the wall thickness of the finished steel pipe is 20mm, the diameter of the finished steel pipe is 1219mm, and the finished steel pipe is 32750 dual-phase steel.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115351519A (en) * | 2022-10-20 | 2022-11-18 | 江苏银环精密钢管有限公司 | Preparation method of inner cylinder for heat exchange unit of high-temperature gas cooled reactor evaporator |
| CN116167396A (en) * | 2023-01-09 | 2023-05-26 | 太原重工股份有限公司 | Material tracking method for straight welded pipe |
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| CN116167396A (en) * | 2023-01-09 | 2023-05-26 | 太原重工股份有限公司 | Material tracking method for straight welded pipe |
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Application publication date: 20201215 |