A processing technique for nickel-based alloy electrothermal tube strip

Abstract

The application discloses a processing technology of a nickel-based alloy electrothermal pipe strip, which comprises the following steps: S1, forging: heating a nickel-based alloy ingot, feeding the nickel-based alloy ingot into a forging press, and obtaining a nickel-based alloy forging blank after multiple upsetting and elongating; S2, hot rolling: heating the nickel-based alloy forging blank to 1060-1120 DEG C, and hot rolling to form a nickel-based alloy strip blank; S2, strip blank annealing: annealing the nickel-based alloy strip blank, the annealing temperature is 850-920 DEG C, and the heat preservation time is 3-5 hours; S4, cold rolling: feeding the nickel-based alloy strip blank into a cold rolling mill for multiple rolling, and carrying out intermediate annealing after each pass of the nickel-based alloy strip blank to obtain a cold rolled strip; and S5, finished product annealing: annealing the cold rolled strip, and the temperature is 860-900 DEG C. Compared with the prior art, the application effectively improves the uniformity of the strip grain, improves the grain size grade, and avoids wrinkles and cracks of the nickel-based alloy strip during subsequent pipe bending processing.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of rolling processing, and particularly relates to a processing technology of a nickel-based alloy electric heating tube strip. BACKGROUND

[0002] When metal pipe materials are processed, the strip is usually rolled into a pipe blank and then welded into a pipe material. For example, a welded pipe processing technology capable of replacing a seamless pipe is disclosed in Chinese Patent CN113000625A, which comprises the following steps:

[0003] Step 1: raw material pretreatment; step 2: forming rolling; step 3: welding; step 4: weld polishing treatment; step 5: heat treatment; and step 6: cleaning detection.

[0004] At present, when an electric heating tube is prepared, a nickel-based alloy strip is used as a raw material for processing. However, when the grain size of the nickel-based alloy strip reaches level 4, the electric heating tube made of the nickel-based alloy strip will wrinkle and crack during pipe bending processing, affecting the yield of the electric heating tube. SUMMARY

[0005] The purpose of the present application is to provide a processing technology of a nickel-based alloy electric heating tube strip, which effectively improves the uniformity of the grain of the strip, improves the grain size grade, and avoids the wrinkling and cracking of the nickel-based alloy strip during subsequent pipe bending processing.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: a processing technology of a nickel-based alloy electric heating tube strip, comprising the following steps:

[0007] S1, forging: heating a nickel-based alloy ingot, feeding the nickel-based alloy ingot into a forging press, and obtaining a nickel-based alloy forged blank after multiple upsetting and lengthening;

[0008] S2, hot rolling: heating the nickel-based alloy forged blank to 1060-1120 DEG C, and hot rolling to form a nickel-based alloy strip blank;

[0009] S2, strip blank annealing: annealing the nickel-based alloy strip blank, the annealing temperature is 850-920 DEG C, and the holding time is 3-5 hours;

[0010] S4, cold rolling: feeding the nickel-based alloy strip blank into a cold rolling mill for rolling multiple times, and after each pass of the nickel-based alloy strip blank, intermediate annealing is performed, the annealing temperature is 1020-1080 DEG C, and a cold-rolled strip is obtained;

[0011] S5, finished product annealing: annealing the cold-rolled strip, the temperature is 860-900 DEG C.

[0012] Further description of the above technical scheme:

[0013] In step S1, the nickel-based alloy ingot is subjected to a 3-time upsetting and elongating process, the nickel-based alloy ingot is upset to 1 / 3-1 / 2 of the original height, and then elongated to 4 / 5-1 times of the original height, to obtain a primary forging blank, the primary forging blank is upset to 1 / 3-1 / 2 of the original height, and then elongated to 3 / 2-2 times of the original height, to obtain a secondary forging blank, the secondary forging blank is upset to 1 / 3-1 / 2 of the original height, and then elongated to 2-3 times of the original height, to obtain a nickel-based alloy forging blank.

[0014] As a further description of the above technical solution:

[0015] In step S2, the nickel-based alloy forging blank is subjected to multi-pass hot rolling.

[0016] As a further description of the above technical solution:

[0017] In step S2, the nickel-based alloy forging blank is subjected to 2-pass hot rolling, in the first hot rolling, the nickel-based alloy forging blank is heated to 1060-1090 DEG C, and a primary strip blank is obtained by rolling; the temperature of the primary strip blank is lowered to 960-1000 DEG C, and a nickel-based alloy strip blank is obtained by rolling.

[0018] As a further description of the above technical solution:

[0019] In step S2, the deformation in the first hot rolling is 20-30%, and the deformation in the second hot rolling is 25-40%.

[0020] As a further description of the above technical solution:

[0021] In step S4, before the nickel-based alloy strip blank is sent into a cold rolling mill for rolling, the surface of the nickel-based alloy strip blank is first ground.

[0022] As a further description of the above technical solution:

[0023] In step S4, the nickel-based alloy strip blank is rolled for 3 times, the deformation in the first pass is 60-65%, the deformation in the second pass is 46-50%, and the deformation in the third pass is 34-40%.

[0024] As a result of adopting the above technical solution, the present application has the following beneficial effects:

[0025] 1. In this invention, the processing of nickel-based alloy strip involves multiple passes of hot rolling and cold rolling, resulting in a more uniform grain size and preventing excessive grain size differences. Furthermore, the hot rolling process employs a two-stage deformation method with initially high temperatures followed by lower temperatures. This ensures complete dynamic recrystallization while limiting the growth of dynamically recrystallized grains. By adjusting the heat treatment process, the degree of crystallinity is reduced during heat treatment. The resulting nickel-based alloy strip exhibits high grain uniformity, improved grain size, and prevents wrinkling and cracking during subsequent pipe bending.

[0026] 2. In this invention, the nickel-based alloy forging billet obtained after multiple upsetting and stretching of the nickel-based alloy ingot has uniform and fine grains, which facilitates the improvement of the uniformity of the strip grains. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a flowchart of the processing technology for a nickel-based alloy electric heating tube strip. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0031] Example 1

[0032] This invention provides a technical solution: a processing technology for nickel-based alloy electric heating tube strips, comprising the following steps:

[0033] S1. Forging: Heat the nickel-based alloy ingot, feed the nickel-based alloy ingot into the forging press, and obtain the nickel-based alloy forging billet after multiple upsetting and stretching processes.

[0034] S2, hot rolling: the nickel-based alloy ingot is heated to 1060-1120℃, then the nickel-based alloy ingot is subjected to two passes of hot rolling, in the first pass of hot rolling, the nickel-based alloy ingot is heated to 1060-1090℃, and a first strip blank is obtained by rolling; the temperature of the first strip blank is reduced to 960-1000℃, and a nickel-based alloy strip blank is obtained by rolling; the deformation in the first pass of hot rolling is 25%-30%, and the deformation in the second pass of hot rolling is 25%-30%; the nickel-based alloy strip blank is formed by hot rolling; and the deformations in the two passes of hot rolling are the same;

[0035] S2, strip blank annealing: the nickel-based alloy strip blank is subjected to annealing treatment at an annealing temperature of 850-920℃ for 3-5 hours;

[0036] S4, cold rolling: the surface of the nickel-based alloy strip blank is ground, and then the nickel-based alloy strip blank is fed into a cold rolling machine; the nickel-based alloy strip blank is subjected to three passes of rolling, the deformation in the first pass is 60%-65%, the deformation in the second pass is 46%-50%, and the deformation in the third pass is 34%-40%; after each pass of rolling, the nickel-based alloy strip blank is subjected to intermediate annealing at an annealing temperature of 1020-1080℃, and a cold-rolled strip is obtained;

[0037] S5, product annealing: the cold-rolled strip is subjected to annealing treatment at a temperature of 860-900℃, and the grain size of the obtained strip reaches 6-9 levels.

[0038] In step S1, the nickel-based alloy ingot is subjected to three passes of upsetting and elongation processes; the nickel-based alloy ingot is upset to 1 / 3-1 / 2 of its original height, and then elongated to 4 / 5-1 times the original height of the nickel-based alloy ingot, to obtain a first forged blank; the first forged blank is upset to 1 / 3-1 / 2 of its original height, and then elongated to 3 / 2-2 times the original height of the first forged blank, to obtain a second forged blank; and the second forged blank is upset to 1 / 3-1 / 2 of its original height, and then elongated to 2-3 times the original height of the first forged blank, to obtain a nickel-based alloy forged blank. After the nickel-based alloy ingot is subjected to multiple passes of upsetting and elongation, the nickel-based alloy forged blank has uniform and small grains, which facilitates the improvement of the uniformity of the grain size of the strip.

[0039] Example 2

[0040] The present application provides a technical solution: a processing process of a nickel-based alloy electric heating tube strip, comprising the following steps:

[0041] S1, forging: heating a nickel-based alloy ingot, and feeding the nickel-based alloy ingot into a forging press to obtain a nickel-based alloy forged blank after multiple passes of upsetting and elongation;

[0042] S2, hot rolling: the nickel-based alloy ingot is heated to 1060-1120℃, and then the nickel-based alloy ingot is subjected to two passes of hot rolling; in the first pass of hot rolling, the nickel-based alloy ingot is heated to 1060-1090℃, and a first-pass strip blank is obtained by rolling; the temperature of the first-pass strip blank is lowered to 960-1000℃, and a nickel-based alloy strip blank is obtained by rolling; the deformation amount in the first pass of hot rolling is 20-25%, and the deformation amount in the second pass of hot rolling is 30-35%; the nickel-based alloy strip blank is formed by hot rolling; the deformation amount in the first pass of hot rolling is less than the deformation amount in the second pass of hot rolling;

[0043] S2, strip blank annealing: the nickel-based alloy strip blank is subjected to annealing treatment at an annealing temperature of 850-920℃ for 3-5 hours;

[0044] S4, cold rolling: the surface of the nickel-based alloy strip blank is ground, and then the nickel-based alloy strip blank is fed into a cold rolling mill; the nickel-based alloy strip blank is subjected to three passes of rolling; the deformation amount in the first pass is 60-65%, the deformation amount in the second pass is 46-50%, and the deformation amount in the third pass is 34-40%; after each pass of rolling, the nickel-based alloy strip blank is subjected to intermediate annealing at an annealing temperature of 1020-1080℃, and a cold-rolled strip is obtained;

[0045] S5, finished product annealing: the cold-rolled strip is subjected to annealing treatment at a temperature of 860-900℃, and the grain size of the obtained strip reaches 6-9 levels.

[0046] In step S1, the nickel-based alloy ingot is subjected to three passes of upsetting and elongation processes; after the nickel-based alloy ingot is upset to 1 / 3-1 / 2 of its original height, it is elongated to 4 / 5-1 times of the original height of the nickel-based alloy ingot, and a first-pass forged blank is obtained; after the first-pass forged blank is upset to 1 / 3-1 / 2 of its original height, it is elongated to 3 / 2-2 times of the original height of the first-pass forged blank, and a second-pass forged blank is obtained; after the second-pass forged blank is upset to 1 / 3-1 / 2 of its original height, it is elongated to 2-3 times of the original height of the first-pass forged blank, and a nickel-based alloy forged blank is obtained. After the nickel-based alloy ingot is subjected to multiple passes of upsetting and elongation, the nickel-based alloy forged blank has uniform and fine grains, which facilitates the improvement of the uniformity of the grain size of the strip.

[0047] The above description is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacements or changes within the technical range disclosed in the present application according to the technical solution and inventive concept of the present application, which should be covered within the protection scope of the present application.

Claims

1. A process for processing a nickel-base alloy electrothermal tube strip material, characterized by, The method comprises the following steps: S1, forging: heating a nickel-based alloy ingot, feeding the nickel-based alloy ingot into a forging press, and obtaining a nickel-based alloy forging blank after multiple upsetting and lengthening; S2, hot rolling: heating the nickel-based alloy forging blank to 1060-1120℃, and hot rolling to form a nickel-based alloy strip blank; S2, strip blank annealing: annealing the nickel-based alloy strip blank, with an annealing temperature of 850-920℃ and a holding time of 3-5 hours; S4, cold rolling: feeding the nickel-based alloy strip blank into a cold rolling mill for multiple rolling, and after each pass of the nickel-based alloy strip blank, intermediate annealing is performed at an annealing temperature of 1020-1080℃ to obtain a cold-rolled strip; S5, finished product annealing: annealing the cold-rolled strip at a temperature of 860-900℃; In the step S2, the nickel-based alloy forging blank is hot rolled in multiple passes, and the nickel-based alloy forging blank is hot rolled in 2 passes, the nickel-based alloy forging blank is heated to 1060-1090℃ during the first hot rolling, and a primary strip blank is obtained by rolling; the temperature of the primary strip blank is reduced to 960-1000℃, and the nickel-based alloy strip blank is obtained by rolling; In the step S2, the deformation of the first hot rolling is 20%-30%, and the deformation of the second hot rolling is 25%-40%; In the step S1, the nickel-based alloy ingot is subjected to 3 times of upsetting and lengthening process, the nickel-based alloy ingot is upset to 1 / 3-1 / 2 of its own height, and then lengthened to 4 / 5-1 times of the original nickel-based alloy ingot height to obtain a primary forging blank, the primary forging blank is upset to 1 / 3-1 / 2 of its own height, and then lengthened to 3 / 2-2 times of the original primary forging blank height to obtain a secondary forging blank, and the secondary forging blank is upset to 1 / 3-1 / 2 of its own height, and then lengthened to 2-3 times of the original primary forging blank height to obtain the nickel-based alloy forging blank.

2. The process for processing of strip for electrically heated tube of nickel base alloy as claimed in claim 1 wherein, In the step S4, the surface of the nickel-based alloy strip blank is ground before being fed into the cold rolling mill.

3. The process for processing of strip for electric heat tube of nickel base alloy as claimed in claim 1 wherein, In the step S4, the nickel-based alloy strip blank is rolled for three times, the deformation of the first pass is 60%-65%, the deformation of the second pass is 46%-50%, and the deformation of the third pass is 34%-40%.

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