Hot rolling method for GH4169 alloy coil

Abstract

The invention belongs to the technical field of nickel-based high-temperature alloy material processing, and particularly relates to a GH4169 alloy coil hot rolling method, which better solves the problems that the GH4169 alloy is large in rolling deformation resistance and high in rolling efficiency by controlling a heating schedule and deformation, matching procedures such as heating, rolling, shearing, cooling and rolling and adopting a whole-line computer system for control. And heat dissipation is difficult and overheating is easy to occur. The whole rolling process adopts a full-process temperature control and rolling control technology, one-time heating and one-time heat compensation are adopted, the rolling starting temperature of rough rolling and subsequent intermediate rolling and finish rolling can be effectively controlled, the structure and performance of the product can be effectively improved, the product with uniform structure and qualified performance can be obtained, the production efficiency is high, and the yield is high.

Description

Technical Field

[0001] The invention belongs to the technical field of nickel-based high-temperature alloy material processing, and in particular relates to a GH4169 alloy coil hot rolling method. Background Art

[0002] GH4169 is a precipitation-strengthened nickel-based high-temperature alloy with excellent high-temperature strength, hardness and creep resistance. It can maintain stable mechanical properties and structural integrity in high-temperature environments; it can form a dense oxide film at high temperatures to effectively prevent oxidation and corrosion and protect the base material from being damaged; at the same time, it also has good resistance to a variety of corrosive media, including acids, alkalis, salts, etc.

[0003] Thanks to the above advantages, GH4169 alloy is widely used in the aerospace field to manufacture fasteners, engine blades, turbine disks, combustion chambers and other components. With the rapid development of the aviation industry, the demand for nickel-based high-temperature alloy coils is also growing. The use of hot rolling to produce GH4169 high-temperature alloy has become an effective way to improve production efficiency and product quality and reduce production costs. However, the high and high temperature strength and hardness of GH4169 alloy put forward higher requirements on rolling equipment, requiring greater rolling force; and its thermal conductivity is low, only about 30% of that of general steel, which will lead to heat accumulation in the rolled piece, temperature rise, and easy overheating, which will have a serious impact on the organizational properties of the product. Summary of the invention

[0004] In view of this, the main technical problem solved by the present invention is to provide a GH4169 alloy coil hot rolling method, which controls the heating system and deformation amount, and undergoes heating, rolling, shearing, cooling and coiling processes to heat the GH4169 alloy bar billet once and then roll it into a large single weight Φ8.0mm~Φ15.0mm coil with good organizational properties.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] In one aspect, the present invention provides a GH4169 alloy coil hot rolling method, which comprises the following steps:

[0007] (1) Heating:

[0008] Heat the GH4169 alloy billet to 900°C to 1200°C and keep it at this temperature for 1 to 3 hours;

[0009] (2) Rough rolling:

[0010] The GH4169 alloy bar obtained in step (1) is subjected to rough rolling, wherein the total deformation of the rough rolling is 50% to 95%;

[0011] (3) Heat supplement:

[0012] The rough-rolled workpiece obtained in step (2) is cut into pieces with a length of 50 to 100 mm and subjected to supplementary heating using a supplementary heating system at a temperature of 800° C. to 1100° C.;

[0013] (4) Medium rolling:

[0014] The heated rolled piece obtained in step (3) is subjected to intermediate rolling, wherein the total deformation of the intermediate rolling is 60% to 90%;

[0015] (5) Finish rolling:

[0016] The rolled piece obtained in step (4) is cut by 500 to 700 mm and then subjected to finish rolling, wherein the total deformation of the finish rolling is 30% to 80%;

[0017] (6) Winding and cooling:

[0018] The finish-rolled piece obtained in step (5) is coiled and water-cooled or air-cooled to obtain a GH4169 alloy coil product.

[0019] Furthermore, in step (1), the size of the GH4169 alloy bar billet is Φ100 mm×6100 mm.

[0020] Furthermore, in step (3), the supplementary heat system is a medium frequency induction heating furnace.

[0021] Furthermore, in step (5), the final rolling temperature of the finish rolling is controlled at 700°C to 950°C.

[0022] On the other hand, the present invention provides a GH4169 alloy coil, which is prepared by the above method.

[0023] Furthermore, the diameter of the GH4169 alloy coil is 8.0 mm to 15.0 mm.

[0024] Compared with the prior art, the present invention has the following beneficial effects.

[0025] The present invention provides a GH4169 alloy coil hot rolling method, which is controlled by a full-line computer system through the cooperation of heating, rolling, shearing, cooling, coiling and other processes, and better solves the problem of large rolling deformation resistance, difficult heat dissipation and easy overheating of the GH4169 alloy, and has the following advantages:

[0026] 1) The whole rolling process adopts the whole process temperature control and rolling control technology, adopts one-time heating and one-time supplementary heating, which can effectively control the starting rolling temperature of rough rolling and subsequent intermediate rolling and finishing rolling, and can effectively improve the product structure and performance, which is conducive to obtaining products with uniform structure and qualified performance;

[0027] 2) The mass of a single coil can reach more than 350kg, and the product has small dimensional deviation and good surface quality, which can reduce the amount of peeling in machining and reduce the consumption of machining raw materials, so the production efficiency is high and the yield rate is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0029] Figure 1 The present invention is a production line process flow chart of the GH4169 alloy coil hot rolling method;

[0030] Figure 2 This is a physical photo of the GH4169 alloy coil produced in Example 1 of the present invention.

[0031] Figure 3 This is a surface photograph of the Φ8.0 mm GH4169 alloy coil provided in Example 1 of the present invention.

[0032] Figure 4 (a)-(b) are respectively the transverse and longitudinal low-magnification metallographic images of the Φ8.0 mm GH4169 alloy coil provided in Example 1 of the present invention.

[0033] Figure 5 (a)-(b) are respectively the transverse and longitudinal high-magnification metallographic images of the Φ8.0 mm GH4169 alloy coil provided in Example 1 of the present invention.

[0034] Figure 6 This is a surface photograph of the Φ13.2 mm GH4169 alloy coil provided in Example 2 of the present invention.

[0035] Figure 7 (a)-(b) are respectively the transverse and longitudinal low-magnification metallographic images of the Φ13.2 mm GH4169 alloy coil provided in Example 2 of the present invention.

[0036] Figure 8 (a)-(b) are respectively the transverse and longitudinal high-magnification metallographic images of the Φ13.2 mm GH4169 alloy coil provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the following will be clearly and completely described in conjunction with the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The present invention provides a GH4169 alloy coil hot rolling method, the hot rolling system used mainly comprises: a box-type resistance furnace, a furnace front feeding device, a rough rolling mill, a pre-intermediate rolling heat-adding furnace, an intermediate rolling unit, a finishing rolling unit and a coiling machine, etc., which can achieve high-quality coils with a single coil weight greater than 350kg.

[0039] Example 1

[0040] (1) Heating: A GH4169 alloy bar with a size of Φ100 mm × 6100 mm was selected and heated to 1000 (±10) °C in a pusher-type resistance furnace and kept warm for 1 to 3 h;

[0041] (2) Rough rolling: The heated GH4169 alloy billet was rough rolled using a BD600 rough rolling machine with a deformation of 85%;

[0042] (3) Supplementary heating: After the rough rolled piece is cut to 50 mm to 100 mm, it is supplemented with heating in a medium frequency induction heating furnace at a temperature of 850°C to 900°C.

[0043] (4) Intermediate rolling: The heated rolled piece is subjected to intermediate rolling using a Φ350+Φ300 two-roll rolling mill, with a total deformation of 85%;

[0044] (5) Finish rolling: After the intermediate rolling, the rolled piece is cut to 500 mm to 700 mm and then finished by a finishing mill. The total deformation is 71%, and the final rolling temperature is controlled at 900°C to 950°C.

[0045] (6) Coiling: The finished rolled piece enters the coiler for coiling;

[0046] (7) Cooling: Air cooling at room temperature to obtain a GH4169 alloy coil product with a specification of Φ8.0mm×~953000mm.

[0047] Figure 2 The physical picture of the GH4169 alloy coil produced in this embodiment is shown in FIG. Figure 3 This is a surface photograph of the Φ8.0GH4169 alloy coil provided in this embodiment. Figure 4 and 5The horizontal and vertical low-magnification (33×) and horizontal and vertical high-magnification (500×) metallographic phase diagrams of the Φ8.0GH4169 alloy coil provided in this embodiment are shown in FIG. Figure 4 and Figure 5 It can be seen that the GH4169 alloy coil with a uniform and fine grain structure and stable precipitation of the γ" phase is prepared in this embodiment, and a good balance is maintained between the various phases in the GH4169 alloy.

[0048] Example 2

[0049] (1) Heating: A GH4169 alloy bar with a size of Φ100 mm × 2600 mm was selected and heated to 1000 (±10) °C in a pusher-type resistance furnace and kept warm for 1 to 3 h;

[0050] (2) Rough rolling: The heated GH4169 alloy billet was rough rolled using a BD600 rough rolling machine, with a total deformation of 85%;

[0051] (3) Supplementary heating: After the rough rolled piece is cut to 50 mm to 100 mm, it is supplemented with heating in an electromagnetic induction heating furnace at a temperature of 850°C to 900°C.

[0052] (4) Intermediate rolling: The heated rolled piece is subjected to intermediate rolling using a Φ350+Φ300 two-roll rolling mill, with a total deformation of 85%;

[0053] (5) Finish rolling: After the intermediate rolling, the rolled piece is cut to 500 mm to 700 mm and then finished by a finishing mill. The total deformation is 56%, and the final rolling temperature is controlled at 900°C to 950°C.

[0054] (6) Coiling: The finished rolled piece enters the coiler for coiling;

[0055] (7) Cooling: Air cooling at room temperature to obtain a GH4169 alloy coil product with a specification of Φ13.2mm×~306000mm.

[0056] Figure 6 This is a surface photograph of the Φ13.2 mm GH4169 alloy coil provided in this embodiment. Figure 7 and 8 The metallographic images of the Φ13.2 mm GH4169 alloy coil at low magnification (33×) and high magnification (500×) of the Φ13.2 mm GH4169 alloy coil provided in this embodiment are shown in FIG. Figure 7 and Figure 8 It can be seen that the GH4169 alloy coil with a uniform and fine grain structure and stable precipitation of the γ" phase is prepared in this embodiment, and a good balance is maintained between the various phases in the GH4169 alloy.

[0057] It should be noted that the above-described embodiments are only preferred embodiments of the present invention. For those skilled in the art, without departing from the principles of the present invention, the present invention may be modified, improved and replaced with equivalents, and these modifications, improvements and equivalent replacements are also considered to fall within the scope of protection of the claims of the present invention.

Claims

1. A GH4169 alloy coil hot rolling method, characterized in that: The steps include: (1) Heating: Heat the GH4169 alloy billet to 900°C to 1200°C and keep it at this temperature for 1 to 3 hours; (2) Rough rolling: The GH4169 alloy bar obtained in step (1) is subjected to rough rolling, wherein the total deformation of the rough rolling is 50% to 95%; (3) Heat supplement: The rough-rolled workpiece obtained in step (2) is cut into pieces with a length of 50 to 100 mm and subjected to supplementary heating using a supplementary heating system at a temperature of 800° C. to 1100° C.; (4) Medium rolling: The heated rolled piece obtained in step (3) is subjected to intermediate rolling, wherein the total deformation of the intermediate rolling is 60% to 90%; (5) Finish rolling: The rolled piece obtained in step (4) is cut by 500 to 700 mm and then subjected to finish rolling, wherein the total deformation of the finish rolling is 30% to 80%; (6) Winding and cooling: The finish-rolled piece obtained in step (5) is coiled and water-cooled or air-cooled to obtain a GH4169 alloy coil product.

2. The GH4169 alloy coil hot rolling method according to claim 1, characterized in that: In step (1), the size of the GH4169 alloy bar billet is Φ100 mm×6100 mm.

3. The GH4169 alloy coil hot rolling method according to claim 1, characterized in that: In step (3), the supplementary heat system is a medium frequency induction heating furnace.

4. The GH4169 alloy coil hot rolling method according to claim 1, characterized in that: In step (5), the final rolling temperature of the finish rolling is controlled at 700°C to 950°C.

5. A GH4169 alloy coil, characterized in that: Prepared by the method described in claim 1.

6. The GH4169 alloy coil according to claim 5, characterized in that: The diameter of the GH4169 alloy coil is 8.0 mm to 15.0 mm.

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