CN112058955A - Straightening die suitable for large-diameter straight seam welded steel pipe - Google Patents
Straightening die suitable for large-diameter straight seam welded steel pipe Download PDFInfo
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- CN112058955A CN112058955A CN201910499571.7A CN201910499571A CN112058955A CN 112058955 A CN112058955 A CN 112058955A CN 201910499571 A CN201910499571 A CN 201910499571A CN 112058955 A CN112058955 A CN 112058955A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
- B21D3/14—Recontouring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/02—Die constructions enabling assembly of the die parts in different ways
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Abstract
The invention discloses a straightening die suitable for a large-caliber straight welded steel pipe, which is connected to a pressure oil cylinder and comprises a transitional connecting die holder and a straightening die body; the upper surface of the straightening die body is a connecting surface, the lower surface of the straightening die body is a straightening contact arc surface, and the straightening die body comprises a large-containing-angle straightening die body, a medium-containing-angle straightening die body and a small-containing-angle straightening die body; the upper surface of the straightening die body with the large containing angle is connected with a pressure oil cylinder; the upper surface of the large-wrap-angle straightening die body is connected with a pressure oil cylinder; or the upper surface of the straightening die body with the small included angle is connected with the lower surface of the transitional connecting die holder, and the upper surface of the transitional connecting die holder is connected with the pressure oil cylinder. The invention can meet the requirements of the maximum straightening pressure of 1200 tons, the pipe diameter phi 508-phi 1422mm, the wall thickness of 6.4-40 mm and the maximum steel grade welded steel pipe straightening.
Description
Technical Field
The invention relates to finishing equipment for a large-caliber straight welded steel pipe, in particular to a straightening die suitable for the large-caliber straight welded steel pipe.
Background
With the advancement of material science and metallurgical technology, the pipeline industry is moving towards high delivery pressures and large delivery flows. The pipeline steel pipe has higher and higher strength requirement, thicker pipe wall and larger diameter, and higher manufacturing precision of the finished product steel pipe, which greatly promotes the development of the pipeline steel pipe manufacturing technology.
The linear submerged arc welding pipe has a welding seam which is a straight line along the length of the pipe, so-called banana bend is inevitably generated due to the action of heat influence in the welding process, the straightness of the steel pipe is influenced, and the influence degree has a certain relation with the specification, the material performance, the forming quality and the like of the steel pipe. A domestic straight welded pipe production line, no matter a JCOE production line or a UOE production line, a process on the production line having a straightening effect on a welded pipe is expanding, the welded pipe is straightened to a certain extent by virtue of the stepping adjustment and the expanding parameter adjustment of a clamp, and under a normal condition, the full-length straightness guarantee capacity after expanding is 0.15% L, so that the requirement of an AP I standard on the straightness of a product (the straightness of a steel pipe is less than or equal to 0.2% L as required by the AP I standard) can be met, and the requirement of a DNV standard on the straightness of a marine pipe product (the straightness of the steel pipe is less than or equal to 0.15% L as required by the DNV standard) can also; but can not meet the new requirements of products with straightness less than or equal to 0.1 percent L, which are provided by some users. Particularly, for large thick-walled steel pipes with the diameter of 1016-1422 mm and the like, the straightness of the welded pipe cannot be effectively controlled even under the premise of strictly controlling the plate performance and accurately adjusting the parameters of forming, welding and expanding, and the rejection rate of the straightness still reaches about 30%, so that the smooth operation of a production line is influenced.
At present, most of domestic straight welded pipe production lines build a steel pipe straightener in construction or subsequent production, the straightener has the capacity of 600-800 tons, and is generally a three-point type up-pressing pressure straightener, the pressure straightener is relatively suitable for the diameter specification of a straightened steel pipe of 406-914 mm, the wall thickness of the straightened steel pipe of 6-32 mm, and the length of the straightened steel pipe of 9000-12000 mm, the straightener mold is generally manufactured by re-welding the steel pipe to be straightened after cutting upper and lower semicircles of the steel pipe with the same specification, and the following problems mainly exist:
1) the precision of the straightening die is unreliable, and the die causes indentation on the contact surface of the steel pipe when straightening frequently occurs;
2) the die is single and heavy, and is inconvenient to disassemble and assemble;
3) poor mold positioning, lateral and longitudinal force deflection, etc.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a straightening die suitable for a large-caliber straight welded steel pipe, which can meet the requirements of the maximum straightening pressure of 1200 tons, the pipe diameters of phi 508-phi 1422mm, the wall thicknesses of 6.4-40 mm and the maximum steel grade X80, so that the straightened steel pipe has no scratch, indentation, local change of ellipticity and other regenerative defects, and meets the requirements of most of welded steel pipe straightening.
In order to achieve the purpose, the invention adopts the following technical scheme:
a straightening die suitable for a large-caliber straight seam welded steel pipe is connected to a pressure oil cylinder of a pressure straightening machine and comprises a transitional connecting die holder and a straightening die body;
the upper surface of the straightening die body is a connecting surface, the lower surface of the straightening die body is a straightening contact arc surface, and the straightening die body comprises a large-containing-angle straightening die body, a medium-containing-angle straightening die body and a small-containing-angle straightening die body;
the upper surface of the straightening die body with the large included angle is connected with the pressure oil cylinder; or
The upper surface of the middle wrap angle straightening die body is connected with the lower surface of the large wrap angle straightening die body, and the upper surface of the large wrap angle straightening die body is connected with the pressure oil cylinder; or
The upper surface of the straightening die body with the small included angle is connected with the lower surface of the transitional connecting die holder, and the upper surface of the transitional connecting die holder is connected with the pressure oil cylinder.
The large-containing-angle straightening die body comprises a straightening die body with the pipe diameter of 1016mm, a straightening die body with the pipe diameter of 1219mm and a straightening die body with the pipe diameter of 1422 mm.
The upper surface of the middle containing angle straightening die body is an arc surface and is matched with a straightening contact arc surface of the straightening die body with the pipe diameter of 1016 mm.
The middle-contained angle straightening die body comprises a straightening die body with the pipe diameter of 762mm, a straightening die body with the pipe diameter of 813mm and a straightening die body with the pipe diameter of 914 mm.
The straightening die body with the small included angle comprises a straightening die body with the pipe diameter of 508mm, a straightening die body with the pipe diameter of 559mm, a straightening die body with the pipe diameter of 610mm, a straightening die body with the pipe diameter of 660mm and a straightening die body with the pipe diameter of 711 mm.
The upper surface of the straightening die body with the pipe diameter of 508mm is an arc surface and is matched with the straightening contact arc surface of the straightening die body with the pipe diameter of 711mm, and the upper surface of the straightening die body with the pipe diameter of 711mm is connected with the pressure oil cylinder.
And two ends of the straightening contact arc surface on the lower surface of the straightening die body are both in arc transition arrangement, and two side surfaces of the straightening contact arc surface are both in arc transition arrangement.
The upper surface and the lower surface of the transitional connection die holder are provided with positioning holes.
And the positioning hole on the upper surface of the transitional connecting die holder is matched with the positioning pin on the pressure oil cylinder and is connected with the positioning pin through a connecting bolt.
The lower surface of the transitional connecting die holder is connected with the straightening die body through a connecting pull rod.
And a welding seam avoiding notch is also formed in the straightening contact arc surface of the straightening die body.
The welding seam avoiding groove is in a trapezoid shape, the width L1 of the welding seam avoiding groove is 60-65 mm, the height L2 of the welding seam avoiding groove is 5-8 mm, and the angle beta of the welding seam avoiding groove is 90-135 degrees.
The straightening die suitable for the large-caliber straight welded steel pipe provided by the invention has the following beneficial effects
1) The straightening die can meet the straightening pressure of 1200 tons, the diameter of the straightened steel pipe is 508-1422 mm, the wall thickness is 6.4-40 mm, the maximum steel grade is X80, the straightened steel pipe has no scratch, indentation, local change of ovality and other regenerative defects, and the straightening die can meet the straightening requirements of most of pipeline pipes at present;
2) the straightening die adopts a contained angle circular arc design, a circular arc transition design at two sides, a die inner diameter clearance design, a large circular arc transition design at two end parts and a full-length top weld avoiding grooving design, so that the side part and the end part of the steel pipe are prevented from contacting with an indentation;
3) according to the straightening die, the steel pipe contact containing angles with different sizes are designed through dies with different specifications so as to reduce local contact pressure and avoid pipe crushing; front and back lifting ear hooks are designed for all the dies and the transition connecting blocks, so that the dies and the transition connecting blocks are convenient to disassemble and assemble;
4) according to different steel pipe specifications, the straightening die can be used in a single connection mode, a superposition connection mode and a transitional connection die holder connection mode; the seriation design of the straightening die can reduce the weight of a single die, reduce the manufacturing and processing amount of the die, reduce the working stroke of the pressure oil cylinder and improve the working efficiency;
5) in the straightening die, straightening die bodies with pipe diameters of 1016, 1219 and 1422 are connected with a pressure oil cylinder by fine matching positioning and high-strength bolts are connected and fixed; the straightening die bodies with the pipe diameters of 762, 813 and 914 and the straightening die body with the pipe diameter of 1016 are combined for use and are connected by four pull rods to form a whole for straightening; the straightening die comprises straightening die bodies with pipe diameters of 559, 610, 660 and 7111, wherein a transitional connection die holder is connected with a pressure oil cylinder firstly and is connected and fastened through a fine matching positioning and high-strength bolt, and then is connected and fastened through the fine matching positioning and high-strength bolt with the straightening die bodies with the pipe diameters of 559-711; the pipe diameter 508 straightening die body and the pipe diameter 711 straightening die body are superposed and combined and connected by four pull rods to be integrated for straightening.
Drawings
FIG. 1 is a block diagram of a transition connection die holder in a straightening die of the present invention;
FIG. 2 is a left side view of the transition connection die holder of FIG. 1;
FIG. 3a is a schematic view of a straightening die body with a diameter of 1422mm in the straightening die according to the present invention;
FIG. 3b is a schematic view of a straightening die body with a pipe diameter of 1219mm in the straightening die according to the present invention;
FIG. 3c is a schematic view of a straightening die body with a pipe diameter of 1016mm in the straightening die according to the present invention;
FIG. 4a is a schematic view showing the connection between a straightening die body with a pipe diameter of 1016mm and a straightening die body with a pipe diameter of 914mm in the straightening die according to the present invention;
FIG. 4b is a schematic view showing the connection between a straightening die body with a pipe diameter of 1016mm and a straightening die body with a pipe diameter of 813mm in the straightening die according to the present invention;
FIG. 4c is a schematic view showing the connection between a straightening die body with a pipe diameter of 1016mm and a straightening die body with a pipe diameter of 762mm in the straightening die according to the present invention;
FIG. 5a is a schematic view of a straightening die body with a pipe diameter of 711mm in the straightening die according to the present invention;
FIG. 5b is a schematic view of a straightening die body with a pipe diameter of 660mm in the straightening die according to the present invention;
FIG. 5c is a schematic view of a straightening die body with a pipe diameter of 610mm in the straightening die according to the present invention;
FIG. 5d is a schematic view of a straightening die body with a pipe diameter of 559mm in the straightening die according to the present invention;
FIG. 5e is a schematic view showing the connection between a straightening die body with a pipe diameter of 711mm and a straightening die body with a pipe diameter of 508mm in the straightening die according to the present invention;
FIG. 6 is an enlarged view of a straightening die body with a diameter of 1422mm in the straightening die according to the present invention;
FIG. 7 is a left side view of the straightening die body of FIG. 6 with a diameter of 1422 mm;
FIG. 8 is an enlarged schematic view of position A of FIG. 6;
FIG. 9 is an enlarged view of a straightening die body with a pipe diameter of 508mm in the straightening die according to the present invention;
FIG. 10 is a left side view of the straightening die body of FIG. 9 with a pipe diameter of 508 mm;
FIG. 11 is a schematic view showing the connection of a straightening die body with a large included angle according to the present invention;
FIG. 12 is a schematic view of the connection of a straightening die body using a medium inclusion angle of the straightening die according to the present invention;
FIG. 13 is a schematic view showing the connection of the straightening die body with a small included angle of the straightening die according to the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the embodiment.
Referring to fig. 1 to 13, the straightening die for large-caliber straight welded steel pipes according to the present invention is connected to a pressure cylinder 1 of a pressure straightening machine, and includes a transition connection die holder 2 and a straightening die body.
Preferably, the upper surface of the straightening die body is a connecting surface, the lower surface of the straightening die body is a straightening contact arc surface, and the included angle alpha arc arrangement, the two-side arc R1 transition arrangement, the die inner diameter D gap arrangement, the two-end large arc R2 and R3 transition arrangement and the top weld avoiding groove 12 arrangement are adopted, so that the contact surface of the straightening die body and the steel pipe 3 is ensured, and the contact indentation of the two sides and the two ends of the steel pipe 3 is avoided. Different steel pipe 3 contact containing angles alpha are arranged on different straightening die bodies so as to reduce local contact pressure and avoid crushing damage to the steel pipes 3.
Preferably, the straightening die body comprises a large containing angle straightening die body 4, a middle containing angle straightening die body 5 and a small containing angle straightening die body 6 according to different containing angles alpha, and the straightening die body is connected with the pressure oil cylinder 1 in the following relation:
eight high-strength bolts 8 on the upper surface of the straightening die body 4 with the large containing angle are connected with the pressure oil cylinder 1; or
The upper surface of the middle containing angle straightening die body 5 is connected with the lower surface of the large containing angle straightening die body 4, and the upper surface of the large containing angle straightening die body 4 is connected with the pressure oil cylinder 1; or also
The upper surface of the straightening die body 6 with the small included angle is connected with the lower surface of the transitional connection die holder 2 through eight high-strength bolts 9, and the upper surface of the transitional connection die holder 2 is connected with the pressure oil cylinder 1 through eight high-strength bolts 10.
Preferably, the straightening die body 4 with the large containing angle comprises a straightening die body 41 with a pipe diameter of 1016mm, a straightening die body 42 with a pipe diameter of 1219mm and a straightening die body 43 with a pipe diameter of 1422 mm.
Preferably, the upper surface of the middle containing angle straightening die body 5 is an arc surface, is matched with a straightening contact arc surface of the straightening die body 41 with the pipe diameter of 1016mm, and is connected through four pull rods 7.
Preferably, the middle containing angle straightening die body 5 comprises a straightening die body 51 with a pipe diameter of 762mm, a straightening die body 52 with a pipe diameter of 813mm and a straightening die body 53 with a pipe diameter of 914 mm.
Preferably, the straightening die body 6 with the small containing angle comprises a straightening die body 61 with the pipe diameter of 508mm, a straightening die body 62 with the pipe diameter of 559mm, a straightening die body 63 with the pipe diameter of 610mm, a straightening die body 64 with the pipe diameter of 660mm and a straightening die body 65 with the pipe diameter of 711 mm.
Preferably, the upper surface of the straightening die body 61 with the pipe diameter of 508mm is an arc surface, and is matched with the straightening contact arc surface of the straightening die body 65 with the pipe diameter of 711mm through a connecting pull rod 11, and the upper surface of the straightening die body 65 with the pipe diameter of 711mm is connected with the pressure oil cylinder 1 through eight high-strength bolts 10.
Preferably, both ends of the straightening contact arc surface of the lower surface of the straightening die body are in transition arrangement of an arc R1, the large arcs R2 and R3 on the two side surfaces of the straightening contact arc surface are in transition arrangement, and the straightening contact arc surface of the straightening die body is further provided with a weld seam avoiding notch 12, so that the contact surface of the straightening die body and the steel pipe 3 is ensured, and the contact indentation of the two side parts and the two end parts of the steel pipe 3 is avoided.
Preferably, the welding seam avoiding groove is in a trapezoid shape, the width L1 of the welding seam avoiding groove is 60-65 mm, the height L2 of the welding seam avoiding groove is 5-8 mm, and the angle beta of the welding seam avoiding groove is 90-135 degrees.
Preferably, the upper surface and the lower surface of the transitional connection die holder 2 are both provided with positioning holes 21, and the positioning holes 21 on the upper surface of the transitional connection die holder 2 are matched with the positioning pins on the pressure oil cylinder 1, are accurately positioned, and are connected through the connecting bolts 10.
Preferably, the upper surface of the straightening die body is also provided with a positioning hole, so that the straightening die body can be accurately positioned when being installed with the pressure oil cylinder 1 and the transitional connection die holder 2, and deviation is prevented.
Preferably, the straightening die body and the transitional connection die holder 2 are further connected with hoisting ear hooks, so that hoisting, dismounting and mounting are facilitated.
The straightening die is applied to a 1200-ton straightening machine of a UOE production line, the straightened steel pipe has no scratch, indentation, local change of ovality and other regenerative defects, and the actual operation steps are as follows:
1) straightening steel pipes with phi 1016-phi 1422 specifications, directly connecting a straightening die body 4 with a corresponding large containing angle with a pressure oil cylinder 1, positioning holes with the same size on the straightening die body 4 with positioning pins on the pressure oil cylinder 1 by adopting precise matching positioning, and fixing a connecting plate of the straightening die body 4 with the pressure oil cylinder 1 by eight high-strength bolts to perform steel pipe straightening work;
2) straightening steel pipes with phi 762, phi 813 and phi 914 specifications, firstly installing a straightening die body 41 with the pipe diameter of 1016mm, and carrying out the steps; then, a straightening die body 51 with the pipe diameter of 762mm, a straightening die body 52 with the pipe diameter of 813mm and a straightening die body 53 with the pipe diameter of 914mm are respectively superposed on the lower part of the straightening die body 41 with the pipe diameter of 1016mm and are connected by four pull rods to form an integral piece for carrying out steel pipe straightening work;
3) straightening steel pipes with the specifications of phi 559, phi 610, phi 660 and phi 711, firstly installing a transitional connecting die holder 2, and straightening a die body 41 with the same pipe diameter of 1016mm by using the method; then respectively superposing a straightening die body 62 with the pipe diameter of 559mm, a straightening die body 63 with the pipe diameter of 610mm, a straightening die body 64 with the pipe diameter of 660mm and a straightening die body 65 with the pipe diameter of 711mm on the lower part of the transitional connecting die holder 2, and simultaneously connecting and fixing the transitional connecting block 2 and the corresponding die bodies by eight high-strength bolts to form an integral piece for steel pipe straightening;
4) the method comprises the following steps of straightening a phi 508 steel pipe, firstly installing a transitional connecting die holder 2, then overlapping a straightening die body 65 with the pipe diameter of 711mm at the lower part of the transitional connecting die holder 2, and simultaneously connecting and fixing the transitional connecting block 2 and the straightening die body 65 with the pipe diameter of 711mm through eight high-strength bolts; then, a straightening die body 61 with the pipe diameter of 508mm is superposed under a straightening die body 65 with the pipe diameter of 711mm, and four pull rods are used for connection to form an integral part for straightening the steel pipe;
5) the straightening die body is installed in place by combining a traveling crane with a chain block, all high-strength bolts are fastened by torque wrenches, and the straightening die is simple to install, safe and reliable.
In conclusion, the straightening die can reduce the weight of the die and the action stroke of the oil cylinder during straightening; the straightening die adopts different contact containing angle designs, long contact arc transition at two side parts and two end parts, and the like, so that the contact stress between the die and the steel pipe is reduced, and the indentation defects at the side parts and the end parts are avoided; the installation is safe, simple and reliable; the steel pipes straightened by the series of dies have no regenerative defects such as scratch, indentation, local change of ellipticity and the like, and have wide application prospect in the straightening process of a production line of large-caliber straight welded pipes.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (12)
1. A straightening die suitable for a large-caliber straight seam welded steel pipe is connected to a pressure oil cylinder of a pressure straightening machine, and is characterized in that: comprises a transitional connecting die holder and a straightening die body;
the upper surface of the straightening die body is a connecting surface, the lower surface of the straightening die body is a straightening contact arc surface, and the straightening die body comprises a large-containing-angle straightening die body, a medium-containing-angle straightening die body and a small-containing-angle straightening die body;
the upper surface of the straightening die body with the large included angle is connected with the pressure oil cylinder; or
The upper surface of the middle wrap angle straightening die body is connected with the lower surface of the large wrap angle straightening die body, and the upper surface of the large wrap angle straightening die body is connected with the pressure oil cylinder; or
The upper surface of the straightening die body with the small included angle is connected with the lower surface of the transitional connecting die holder, and the upper surface of the transitional connecting die holder is connected with the pressure oil cylinder.
2. A straightening die adapted to a large-caliber straight welded steel pipe according to claim 1, wherein: the large-containing-angle straightening die body comprises a straightening die body with the pipe diameter of 1016mm, a straightening die body with the pipe diameter of 1219mm and a straightening die body with the pipe diameter of 1422 mm.
3. A straightening die adapted to a large-caliber straight welded steel pipe according to claim 2, wherein: the upper surface of the middle containing angle straightening die body is an arc surface and is matched with a straightening contact arc surface of the straightening die body with the pipe diameter of 1016 mm.
4. A straightening die adapted to a large-caliber straight welded steel pipe according to claim 3, wherein: the middle-contained angle straightening die body comprises a straightening die body with the pipe diameter of 762mm, a straightening die body with the pipe diameter of 813mm and a straightening die body with the pipe diameter of 914 mm.
5. A straightening die adapted to a large-caliber straight welded steel pipe according to claim 1, wherein: the straightening die body with the small included angle comprises a straightening die body with the pipe diameter of 508mm, a straightening die body with the pipe diameter of 559mm, a straightening die body with the pipe diameter of 610mm, a straightening die body with the pipe diameter of 660mm and a straightening die body with the pipe diameter of 711 mm.
6. A straightening die suitable for a large-caliber straight welded steel pipe according to claim 5, wherein: the upper surface of the straightening die body with the pipe diameter of 508mm is an arc surface and is matched with the straightening contact arc surface of the straightening die body with the pipe diameter of 711mm, and the upper surface of the straightening die body with the pipe diameter of 711mm is connected with the pressure oil cylinder.
7. A straightening die adapted to a large-caliber straight welded steel pipe according to claim 1, wherein: and two ends of the straightening contact arc surface on the lower surface of the straightening die body are both in arc transition arrangement, and two side surfaces of the straightening contact arc surface are both in arc transition arrangement.
8. A straightening die adapted to a large-caliber straight welded steel pipe according to claim 1, wherein: the upper surface and the lower surface of the transitional connection die holder are provided with positioning holes.
9. A straightening die adapted to a large-caliber straight welded steel pipe according to claim 8, wherein: and the positioning hole on the upper surface of the transitional connecting die holder is matched with the positioning pin on the pressure oil cylinder and is connected with the positioning pin through a connecting bolt.
10. A straightening die adapted to a large-caliber straight welded steel pipe according to claim 1, wherein: the lower surface of the transitional connecting die holder is connected with the straightening die body through a connecting pull rod.
11. A straightening die adapted to a large-caliber straight welded steel pipe according to claim 1, wherein: and a welding seam avoiding notch is also formed in the straightening contact arc surface of the straightening die body.
12. A straightening die adapted to a large-caliber straight welded steel pipe according to claim 11, wherein: the welding seam avoiding groove is in a trapezoidal shape, the width of the welding seam avoiding groove is 60-65 mm, the height of the welding seam avoiding groove is 5-8 mm, and the angle of the welding seam avoiding groove is 90-135 degrees.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910499571.7A CN112058955A (en) | 2019-06-11 | 2019-06-11 | Straightening die suitable for large-diameter straight seam welded steel pipe |
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| CN201910499571.7A CN112058955A (en) | 2019-06-11 | 2019-06-11 | Straightening die suitable for large-diameter straight seam welded steel pipe |
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Application publication date: 20201211 |
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