Tempering process for high-toughness anti-outage thermal alloy wire

Abstract

The invention discloses a tempering process for a high-toughness anti-outage thermal alloy wire. The tempering process comprises the specific steps that (1) pretreatment is conducted; (2) charging preparation; according to the tempering process for the high-toughness anti-outage electric heating alloy wire, the tempering heating section is prolonged to 10 m from traditional 6 m, parameters such as temperature control, speed matching, gas protection and the cooling process are optimized, and uniform and sufficient tempering of the electric heating alloy wire is achieved.

Description

Technical Field

[0001] This invention belongs to the field of metal heat treatment, specifically relating to a tempering process for high-toughness, anti-breakage heating alloy wire. Background Technology

[0002] As the core material of electric heating elements, the quality of electric heating alloy wire directly affects the service life and safety of electric heating equipment. In the production process of electric heating alloy wire, the wire drawing process is a key step, which aims to draw the thicker wire into the required fine wire specifications through the die.

[0003] However, existing technologies have the following problems: 1. Insufficient toughness: Traditional tempering process uses a 6-meter heating section, which results in short heating time for the wire and insufficient transformation of the internal structure, leading to poor toughness of the material and easy brittle fracture during subsequent drawing.

[0004] 2. Poor roundness: Due to uneven tempering, the wire exhibits significant anisotropy, resulting in inconsistent deformation during drawing, which leads to excessive ellipticity and poor surface quality.

[0005] 3. High wire breakage rate: When drawing fine wires, due to insufficient material toughness, the wire breakage rate is usually as high as 5-10%, which seriously affects production efficiency and cost.

[0006] 4. Uneven structure: The short heating section leads to a large temperature difference between the core and the surface of the filament, resulting in asynchronous structural transformation and internal stress concentration. Summary of the Invention

[0007] The main technical problem solved by this invention is to provide a tempering process for high-toughness, anti-breakage heating alloy wire, which solves the problems existing in the prior art.

[0008] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is: to provide a tempering process for high-toughness, anti-breakage heating alloy wire, the specific steps of which include: 1) Pretreatment: First, the surface of the cold-drawn electrothermal alloy wire is pretreated by degreasing and rinsing using a two-tank ultrasonic cleaning system. 2) Furnace preparation: The pretreated wire from step 1) is continuously fed into a tempering furnace with a 10-meter-long heating section and tempered in a protective gas environment. 3) Tempering treatment: The tempering temperature is controlled within the range of 550~750℃, and the running speed of the wire is controlled within the range of 0.5~2.0 m / min, ensuring that the total heat preservation time of the wire in the heating section is 5~20 minutes; 4) Slow cooling treatment: The filament material after the tempering treatment in step 3) is placed in a slow cooling zone for controlled cooling, and the cooling rate is controlled within the range of 50~100℃ / min; 5) Inspection and Packaging: Finally, the filaments after the slow cooling treatment in step 4) are subjected to online quality inspection, and qualified products are wound up and packaged.

[0009] In a preferred embodiment of the present invention, the pretreatment in step 1) includes three steps: alkaline degreasing, acid washing activation, and alcohol rinsing, each with a treatment time of 3 to 5 minutes.

[0010] In a preferred embodiment of the present invention, the 10-meter ultra-long heating section in step 2) adopts a zoned temperature control design, which is divided into 5 independent temperature control zones, each zone being 2 meters long, with the temperature gradient controlled within 10℃ / meter.

[0011] In a preferred embodiment of the present invention, the protective gas in step 2) includes high-purity nitrogen, argon, and a nitrogen-hydrogen mixture.

[0012] In a preferred embodiment of the present invention, the oxygen content in the protective gas is controlled to be below 10 ppm.

[0013] In a preferred embodiment of the present invention, the length of the slow cooling zone in step 4) is 3 to 5 meters, and a stepped cooling method is adopted, with a temperature drop of no more than 50°C per meter.

[0014] In a preferred embodiment of the present invention, the types of tests in step 5) include dimensional accuracy, surface quality and mechanical properties.

[0015] In a preferred embodiment of the present invention, the type of wire includes iron-chromium-aluminum alloy wire and nickel-chromium alloy wire, with a diameter range of 1.0~6.0mm.

[0016] The beneficial effects of the present invention are as follows: The present invention provides a tempering process for high-toughness, anti-breakage electrothermal alloy wire. This process extends the tempering heating section from the traditional 6 meters to 10 meters and optimizes parameters such as temperature control, speed matching, gas protection, and cooling process to achieve uniform and sufficient tempering of the electrothermal alloy wire. Attached Figure Description

[0017] Figure 1 This is a process flow diagram for a tempering process used in high-toughness, anti-breakage heating alloy wire. Detailed Implementation

[0018] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0019] like Figure 1 As shown, a tempering process for high-toughness, anti-breakage heating alloy wire includes the following steps: 1) Pretreatment: First, the surface of the cold-drawn electrothermal alloy wire is pretreated by using a two-tank ultrasonic cleaning system for degreasing and rinsing to ensure surface cleanliness.

[0020] The types of wires include iron-chromium-aluminum alloy wire and nickel-chromium alloy wire, with a diameter range of 1.0~6.0mm.

[0021] The pretreatment in step 1) includes three steps: alkaline degreasing, acid washing activation, and alcohol rinsing, each with a treatment time of 3-5 minutes.

[0022] Alkaline degreasing and acid pickling activation are effective pretreatments, but they introduce new chemical residues. Alcohol rinsing is an unstable and limited final step. Two-tank ultrasonic cleaning provides powerful physical cleaning force (particle removal) and efficient chemical displacement capability (removal of ion residues), ensuring that the workpiece reaches a clean state.

[0023] 2) Furnace preparation: The pretreated wire from step 1) is continuously fed into a tempering furnace with a 10-meter-long heating section and tempered in a protective gas environment.

[0024] The 10-meter-long heating section adopts a zoned temperature control design, which is divided into 5 independent temperature control zones, each 2 meters long, with the temperature gradient controlled within 10℃ / meter to ensure uniform heating of the wire.

[0025] The protective gases include high-purity nitrogen, argon, and a nitrogen-hydrogen mixture, with the oxygen content controlled below 10 ppm.

[0026] 3) Tempering treatment: The tempering temperature is controlled within the range of 550~750℃, and the running speed of the wire is controlled within the range of 0.5~2.0 m / min, ensuring that the total heat preservation time of the wire in the heating section is 5~20 minutes.

[0027] The tempering temperature is 600℃, 650℃ or 700℃, corresponding to different alloy materials and diameter specifications.

[0028] The preferred operating speed of the filament is 0.8 m / min, 1.2 m / min, or 1.5 m / min, which is adjusted according to the diameter of the filament and the tempering temperature.

[0029] 4) Slow cooling treatment: The filament material after the tempering treatment in step 3) is placed in a slow cooling zone for controlled cooling. The cooling rate is controlled within the range of 50~100℃ / minute to prevent excessively rapid cooling from generating new internal stress.

[0030] The slow cooling zone is 3 to 5 meters long and uses a stepped cooling method, with a temperature drop of no more than 50°C per meter.

[0031] 5) Inspection and Packaging: Finally, the filaments after the slow cooling treatment in step 4) are subjected to online quality inspection, and qualified products are wound up and packaged.

[0032] The types of tests include dimensional accuracy, surface quality, and mechanical properties.

[0033] Example 1 1) Pretreatment: First, the cold-drawn electrothermal alloy wire is subjected to three steps: alkaline degreasing, acid pickling activation, and alcohol rinsing. Each step takes 3 minutes. A two-tank ultrasonic cleaning system is used for degreasing and rinsing to ensure surface cleanliness.

[0034] The wire material is 0Cr25Al5 iron-chromium-aluminum alloy wire with a diameter of 3.0mm.

[0035] 2) Furnace preparation: The pretreated wire from step 1) is continuously fed into a tempering furnace with a 10-meter-long heating section and tempered in a 99.99% high-purity nitrogen environment.

[0036] 3) Tempering treatment: The tempering temperature is controlled at 600℃, the running speed of the wire is controlled at 1.2 meters / minute, and the total heat preservation time of the wire in the heating section is 8.3 minutes.

[0037] 4) Slow cooling treatment: The filament material after the tempering treatment in step 3) is placed in a slow cooling zone for controlled cooling. The cooling rate is controlled within the range of 70°C / minute to prevent excessively rapid cooling from generating new internal stress.

[0038] 5) Inspection and Packaging: Finally, the filaments after the slow cooling treatment in step 4) are inspected for dimensional accuracy, surface quality and mechanical properties, and qualified products are wound up and packaged.

[0039] Example 2 1) Pretreatment: First, the cold-drawn electrothermal alloy wire is subjected to three steps: alkaline degreasing, acid pickling activation, and alcohol rinsing. Each step takes 4 minutes. A two-tank ultrasonic cleaning system is used for degreasing and rinsing to ensure surface cleanliness.

[0040] The wire used is Cr20Ni80 nickel-chromium alloy wire with a diameter of 2.5mm.

[0041] 2) Furnace preparation: The pretreated wire from step 1) is continuously fed into a tempering furnace with a 10-meter-long heating section and tempered in a mixed gas environment of argon and 5% hydrogen.

[0042] 3) Tempering treatment: The tempering temperature is controlled at 680℃, the running speed of the wire is controlled at 1 meter / minute, and the total heat preservation time of the wire in the heating section is 10 minutes.

[0043] 4) Slow cooling treatment: The filament material after the tempering treatment in step 3) is placed in a slow cooling zone for controlled cooling. The cooling rate is controlled within the range of 60℃ / minute to prevent excessively rapid cooling from generating new internal stress.

[0044] 5) Inspection and Packaging: Finally, the filaments after the slow cooling treatment in step 4) are inspected for dimensional accuracy, surface quality and mechanical properties, and qualified products are wound up and packaged.

[0045] Example 3 1) Pretreatment: First, the cold-drawn electrothermal alloy wire is subjected to three steps: alkaline degreasing, acid pickling activation, and alcohol rinsing. Each step takes 5 minutes. A two-tank ultrasonic cleaning system is used for degreasing and rinsing to ensure surface cleanliness.

[0046] The wire used is HRE iron-chromium-aluminum alloy wire with a diameter of 4.0 mm.

[0047] 2) Furnace preparation: The pretreated wire from step 1) is continuously fed into a tempering furnace with a 10-meter-long heating section and tempered in a nitrogen-hydrogen mixed gas (95:5) environment.

[0048] 3) Tempering treatment: The tempering temperature is controlled at 720℃, the running speed of the wire is controlled at 0.7 m / min, and the total heat preservation time of the wire in the heating section is 14.3 minutes.

[0049] 4) Slow cooling treatment: The filament material after the tempering treatment in step 3) is placed in a slow cooling zone for controlled cooling. The cooling rate is controlled within the range of 50°C / minute to prevent excessively rapid cooling from generating new internal stress.

[0050] 5) Inspection and Packaging: Finally, the filaments after the slow cooling treatment in step 4) are inspected for dimensional accuracy, surface quality and mechanical properties, and qualified products are wound up and packaged.

[0051] Performance parameters table of a tempering process for high-toughness, anti-breakage heating alloy wire The comparative example uses a traditional 6-meter heating section tempering process, with the same material as Example 1, a tempering temperature of 600℃, a running speed of 1.2 meters / minute, and a holding time of 5 minutes.

[0052] Significantly improved toughness: The elongation of the three embodiments increased by 56% compared to the control, and the plasticity of the material was significantly enhanced.

[0053] Processing performance optimization: the wire breakage rate is reduced by more than 95%, the roundness is improved by 61%, and the surface quality reaches the 0-level standard.

[0054] Stable electrical performance: The resistivity remains stable, meeting the requirements for use of electric heating elements.

[0055] Compared with the prior art, the present invention provides a tempering process for high-toughness, anti-breakage electrothermal alloy wire. This process extends the tempering heating section from the traditional 6 meters to 10 meters and optimizes parameters such as temperature control, speed matching, gas protection, and cooling process to achieve uniform and sufficient tempering of the electrothermal alloy wire.

[0056] The electrothermal alloy wire treated by this process has significantly improved toughness, increased elongation by 30-50%, reduced the subsequent wire breakage rate to below 1%, and achieved a roundness deviation of less than 0.01 mm, while maintaining good electrical properties and surface quality.

[0057] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed during use. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0058] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A tempering process for high-toughness, anti-breakage heating alloy wire, characterized in that, The specific steps include: 1) Pretreatment: First, the surface of the cold-drawn electrothermal alloy wire is pretreated by degreasing and rinsing using a two-tank ultrasonic cleaning system. 2) Furnace preparation: The pretreated wire from step 1) is continuously fed into a tempering furnace with a 10-meter-long heating section and tempered in a protective gas environment. 3) Tempering treatment: The tempering temperature is controlled within the range of 550~750℃, and the running speed of the wire is controlled within the range of 0.5~2.0 m / min, ensuring that the total heat preservation time of the wire in the heating section is 5~20 minutes; 4) Slow cooling treatment: The filament material after the tempering treatment in step 3) is placed in a slow cooling zone for controlled cooling, and the cooling rate is controlled within the range of 50~100℃ / min; 5) Inspection and Packaging: Finally, the filaments after the slow cooling treatment in step 4) are subjected to online quality inspection, and qualified products are wound up and packaged.

2. The tempering process for high-toughness, anti-breakage heating alloy wire according to claim 1, characterized in that, The pretreatment in step 1) includes three steps: alkaline degreasing, acid washing activation, and alcohol rinsing, each with a treatment time of 3-5 minutes.

3. The tempering process for high-toughness, anti-breakage heating alloy wire according to claim 1, characterized in that, The 10-meter ultra-long heating section in step 2) adopts a zoned temperature control design, which is divided into 5 independent temperature control zones, each zone is 2 meters long, and the temperature gradient is controlled within 10℃ / meter.

4. The tempering process for high-toughness, anti-breakage heating alloy wire according to claim 1, characterized in that, The protective gases mentioned in step 2) include high-purity nitrogen, argon, and a nitrogen-hydrogen mixture.

5. The tempering process for high-toughness, anti-breakage heating alloy wire according to claim 2, characterized in that, The oxygen content in the protective gas is controlled to be below 10 ppm.

6. The tempering process for high-toughness, anti-breakage heating alloy wire according to claim 1, characterized in that, The slow cooling zone in step 4) is 3 to 5 meters long and adopts a stepped cooling method, with a temperature drop of no more than 50°C per meter.

7. The tempering process for high-toughness, anti-breakage heating alloy wire according to claim 1, characterized in that, The types of tests mentioned in step 5) include dimensional accuracy, surface quality, and mechanical properties.

8. The tempering process for high-toughness, anti-breakage heating alloy wire according to claim 1, characterized in that, The types of wires include iron-chromium-aluminum alloy wire and nickel-chromium alloy wire, with a diameter range of 1.0~6.0mm.

Images