Ultra-long high-precision bright-finished stainless steel seamless heat exchanger tube

Abstract

An ultra-long high-precision bright-finished stainless steel seamless heat exchanger tube, comprising a tube body. A preparation method therefor comprises the following steps: preparation of a tube blank; acid pickling; polishing; solution treatment; rolling; degreasing; solution treatment; straightening and cutting; acid pickling; inspection; rolling; degreasing; oxygen-free bright solution treatment; straightening; fixed-length cutting; inspection of finished products; non- destructive testing; hydrostatic testing; drying; and shipping. The present invention has the following advantage: an ultra-long high-precision bright-finished seamless heat exchanger tube can be manufactured by means of rational space arrangement and process design.

Description

Ultra-long high-precision bright treated stainless steel seamless heat exchanger tube TECHNICAL FIELD

[0001] The present application relates to an ultra-long high-precision bright treated stainless steel seamless heat exchanger tube. BACKGROUND

[0002] The existing production method of stainless steel tube for heat exchanger, although the stainless steel tube produced is suitable for use in heat exchanger and has high yield, often needs to be processed and installed in multiple sections, thereby easily causing gaps at the connection, and for the hot and cold environment inside the heat exchanger, long-term use is prone to breakage and the like, and the ultra-long heat exchanger tube cannot be formed in one step. SUMMARY

[0003] The present application is to solve the shortcomings in the prior art, and provides an ultra-long high-precision bright treated stainless steel seamless heat exchanger tube.

[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: an ultra-long high-precision bright treated stainless steel seamless heat exchanger tube, comprising the following steps: pipe blank-acid pickling-polishing-solid solution-rolling-degreasing-solid solution-straightening and cutting-acid pickling-inspection-rolling-degreasing-oxygen-free bright solid solution-straightening-cutting to size-finished product inspection-non-destructive testing-water pressure testing-drying-shipping.

[0005] Specifically as follows:

[0006] S1, the pipe blank is subjected to first acid pickling to remove the inner and outer wall oxides;

[0007] S2, the pipe blank is polished;

[0008] S3, the pipe blank is subjected to first solid solution by a natural gas furnace;

[0009] S4, the pipe blank is inspected to check whether there are gaps, notches and cracks inside the pipe blank;

[0010] S5, the pipe blank is subjected to first rolling to form a steel tube;

[0011] S6, the steel tube is immersed in a degreasing solution for first degreasing;

[0012] S7, the steel tube is subjected to second solid solution by a natural gas furnace;

[0013] S8, the steel tube is heated to 900-1100℃, passes through a roller hearth furnace, and is straightened and cut;

[0014] S9, the steel tube is subjected to second acid pickling;

[0015] S10, inspecting the steel pipe to check whether there is a gap, notch and crack in the steel pipe;

[0016] S11, second rolling of the steel pipe;

[0017] S12, second degreasing of the steel pipe by immersing the steel pipe into a degreasing solution; and drying treatment;

[0018] S13, oxygen-free bright solid solution of the steel pipe;

[0019] S14, straightening of the steel pipe after heating;

[0020] S15, cutting the steel pipe to a fixed size;

[0021] S16, finished product inspection, macroscopic inspection;

[0022] S17, non-destructive testing;

[0023] S18, water pressure testing;

[0024] S19, drying;

[0025] S20, delivery.

[0026] Further, there are multiple rolling-degreasing-solid solution-straightening-cutting-acid pickling-inspection in the production process after intermediate inspection to achieve the adaptive length.

[0027] Further, the pipe length is more than 35m.

[0028] Further, the pipe length is 38m.

[0029] Further, the pipe diameter is less than 30mm.

[0030] Further, the wall thickness is 1-4mm.

[0031] Further, it involves 6 areas, which are sequentially divided into a first area, a second area, a third area, a fourth area, a fifth area and a sixth area;

[0032] The sixth area includes: S2, S3, S5, S6;

[0033] The fifth area includes: S4, S7, S8, S10;

[0034] The fourth area includes: S11;

[0035] The third area includes: S12;

[0036] The second area includes: S13, S14, S15;

[0037] The first area includes: S16, S17, S18, S19.

[0038] Further, the first area, the second area, the third area, the fourth area, the fifth area and the sixth area are permeable, so that S1 and S9 can take away the goods for acid pickling, and a transfer device is arranged at the adjacent position.

[0039] Further, the pipe blank is subjected to first rolling, and the pipe blank with a diameter of 65mm and a wall thickness of 6mm is rolled into a pipe with a diameter of 42mm and a wall thickness of 3mm.

[0040] Further, the steel pipe is subjected to second rolling, and the steel pipe with a diameter of 42mm and a wall thickness of 3mm is rolled into a pipe with a diameter of 25mm and a wall thickness of 2mm.

[0041] The application has the beneficial effect that the super-long, high-precision, bright treatment, seamless heat exchanger pipe can be manufactured through reasonable space arrangement and process design. BRIEF DESCRIPTION OF DRAWINGS

[0042] Fig. 1 is a flowchart of the application.

[0043] Fig. 2 is a flowchart of the application. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the accompanying drawings 1-2 in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application.

[0045] Embodiment 1 refers to Figs. 1-2, and the super-long, high-precision, bright treatment, seamless heat exchanger pipe of stainless steel comprises the following steps: pipe blank-acid pickling-polishing-solid solution-rolling-degreasing-solid solution-straightening and cutting-acid pickling-inspection-rolling-degreasing-oxygen-free bright solid solution-straightening-cutting to a fixed size-product inspection-nondestructive testing-water pressure testing-drying-shipping.

[0046] Specifically as follows:

[0047] S1, the pipe blank is subjected to first acid pickling to remove the oxide skin on the inner and outer walls;

[0048] S2, the pipe blank is subjected to polishing;

[0049] S3, the pipe blank is subjected to first solid solution by a natural gas furnace;

[0050] S4, the pipe blank is subjected to inspection to check whether there are gaps, notches and cracks in the pipe blank;

[0051] S5, the pipe blank is subjected to first rolling to form a steel pipe;

[0052] S6, the steel pipe is immersed in a degreasing solution for first degreasing;

[0053] S7, the steel pipe is subjected to second solid solution by a natural gas furnace;

[0054] S8, heating the steel pipe to 900-1100℃, passing through a roller hearth furnace, and straightening the cut;

[0055] S9, second pickling of the steel pipe;

[0056] S10, inspection of the steel pipe to check for cracks, gaps, and flaws in the steel pipe;

[0057] S11, second rolling of the steel pipe;

[0058] S12, second degreasing of the steel pipe by immersing it in a degreasing solution, and drying treatment;

[0059] S13, oxygen-free bright solid solution of the steel pipe;

[0060] S14, straightening of the steel pipe after heating;

[0061] S15, cutting of the steel pipe to size;

[0062] S16, macroscopic inspection of the finished product;

[0063] S17, non-destructive testing;

[0064] S18, water pressure testing.

[0065] S19, drying;

[0066] S20, shipment.

[0067] The super-long high-precision bright processed stainless steel seamless heat exchanger pipe has multiple rolling-degreasing-solid solution-straightening-cutting-pickling-inspection in the production process after intermediate inspection to achieve the desired length.

[0068] The super-long high-precision bright processed stainless steel seamless heat exchanger pipe has a pipe length of more than 35m.

[0069] The super-long high-precision bright processed stainless steel seamless heat exchanger pipe has a pipe length of 38m.

[0070] The super-long high-precision bright processed stainless steel seamless heat exchanger pipe has a pipe diameter of less than 30mm.

[0071] The super-long high-precision bright processed stainless steel seamless heat exchanger pipe has a wall thickness of 1-4mm.

[0072] The super-long high-precision bright processed stainless steel seamless heat exchanger pipe involves 6 areas, which are sequentially divided into a first area, a second area, a third area, a fourth area, a fifth area, and a sixth area.

[0073] The sixth area includes: S2, S3, S5, and S6.

[0074] The fifth area comprises S4, S7, S8, S10;

[0075] The fourth area comprises S11;

[0076] The third area comprises S12;

[0077] The second area comprises S13, S14, S15;

[0078] The first area comprises S16, S17, S18, S19.

[0079] The super-long high-precision bright treated stainless steel seamless heat exchanger pipe is transparent in the first area, the second area, the third area, the fourth area, the fifth area and the sixth area, so that S1 and S9 can pull out the goods for external acid pickling, and a transfer device is arranged at the adjacent positions.

[0080] The super-long high-precision bright treated stainless steel seamless heat exchanger pipe is rolled for the first time, and the pipe blank with a diameter of 65 mm and a wall thickness of 6 mm is rolled into a pipe with a diameter of 42 mm and a wall thickness of 3 mm.

[0081] The super-long high-precision bright treated stainless steel seamless heat exchanger pipe is rolled for the second time, and the steel pipe with a diameter of 42 mm and a wall thickness of 3 mm is rolled into a pipe with a diameter of 25 mm and a wall thickness of 2 mm.

[0082] The super-long high-precision bright treated stainless steel seamless heat exchanger pipe can be manufactured in a limited space through reasonable space arrangement and process design.

[0083] The super-long high-precision bright treated stainless steel seamless heat exchanger pipe is provided with a transfer frame between the first area, the second area, the third area, the fourth area, the fifth area and the sixth area.

[0084] The super-long high-precision bright treated stainless steel seamless heat exchanger pipe is made of stainless steel.

[0085] The above is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A super-long high-precision bright treated stainless steel seamless heat exchanger tube, characterized in that: The production process comprises the following steps: pipe blank-acid pickling-polishing-solid solution-rolling-degreasing-solid solution-straightening and cutting-acid pickling-inspection-rolling-degreasing-oxygen-free bright solid solution-straightening-cutting to size-finished product inspection-nondestructive testing-water pressure testing-drying-shipping; Specifically as follows: S1, performing first acid pickling on the pipe blank to remove the inner and outer wall oxide scales; S2, polishing the pipe blank; S3, performing first solid solution on the pipe blank through a natural gas furnace; S4, inspecting the pipe blank to check whether there are gaps, notches and cracks in the pipe blank; S5, performing first rolling on the pipe blank to form a steel pipe; S6, immersing the steel pipe into a degreasing solution for first degreasing; S7, performing second solid solution on the steel pipe through a natural gas furnace; S8, heating the steel pipe to 900-1100℃, passing through a roller hearth furnace and straightening and cutting; S9, performing second acid pickling on the steel pipe; S10, inspecting the steel pipe to check whether there are gaps, notches and cracks in the steel pipe; S11, performing second rolling on the steel pipe; S12, immersing the steel pipe into a degreasing solution for second degreasing and drying treatment; S13, performing oxygen-free bright solid solution on the steel pipe; S14, straightening the steel pipe after heating; S15, cutting the steel pipe to size; S16, finished product inspection, macroscopic inspection; S17, nondestructive testing; S18, water pressure testing; S19, drying; S20, shipping.

2. The ultra-long high-precision bright annealed stainless steel seamless heat exchanger tube according to claim 1, characterized in that: In the production process, after the intermediate inspection, there are multiple rolling-degreasing-solid solution-straightening and cutting-acid pickling-inspection to adapt to the length.

3. The ultra-long high-precision bright annealed stainless steel seamless heat exchanger tube as claimed in claim 1, wherein: The pipe length is more than 35m.

4. The ultra-long, high-precision, bright annealed stainless steel seamless heat exchanger tube of claim 1, wherein: The pipe length is 38m.

5. The ultra-long, high-precision, bright annealed stainless steel seamless heat exchanger tube of claim 1, wherein: The pipe diameter is less than 30mm.

6. The ultra-long, high-precision, bright annealed stainless steel seamless heat exchanger tube of claim 1 wherein: The wall thickness is 1-4mm.

7. The ultra-long, high-precision, bright annealed stainless steel seamless heat exchanger tube of claim 1, wherein: It involves 6 areas, which are sequentially divided into a first area, a second area, a third area, a fourth area, a fifth area and a sixth area; The sixth area comprises S2, S3, S5 and S6; The fifth area comprises S4, S7, S8 and S10; The fourth area comprises S11; The third area comprises S12; The second area comprises S13, S14 and S15; The first area comprises S16, S17, S18 and S19.

8. The ultra-long, high-precision, bright annealed stainless steel seamless heat exchanger tube of claim 7, wherein: The first area, the second area, the third area, the fourth area, the fifth area and the sixth area are permeable front and back, facilitating the removal of goods by external acid pickling of S1 and S9, and a transfer device is arranged at the adjacent position.

9. The ultra-long, high-precision, bright annealed stainless steel seamless heat exchanger tube of claim 1, wherein: The pipe blank is first rolled, and the pipe blank with a diameter of 65mm and a wall thickness of 6mm is rolled into a pipe with a diameter of 42mm and a wall thickness of 3mm.

10. The ultra-long, high-precision, bright annealed stainless steel seamless heat exchanger tube of claim 1, wherein: The steel pipe is second rolled, and the steel pipe with a diameter of 42mm and a wall thickness of 3mm is rolled into a pipe with a diameter of 25mm and a wall thickness of 2mm.

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