Heat treatment method for improving and stabilizing elongation rate of iron-chromium-aluminum wires
A heat treatment method, iron-chromium-aluminum technology, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve problems such as low elongation and unstable elongation, and achieve increased elongation, less time-consuming, and improved yield Effect
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Embodiment 1
[0029] Heat treatment object: the same as Comparative Example 1, that is, a hot-rolled iron-chromium-aluminum wire rod with a grade of 0Cr25Al5, a diameter of φ10 mm, and a mass of 20 kg.
[0030] Heat treatment method:
[0031] 1. Heat up the box-type electric furnace from room temperature to 880°C, and the heating rate is 15°C / min;
[0032] 2. Before the furnace temperature of the box-type electric furnace drops to 820°C, put the above-mentioned iron-chromium-aluminum wire into the heated box-type electric furnace, and then raise the temperature of the box-type electric furnace to 850°C at a heating rate of 5°C / min, and keep it warm for 20 minute;
[0033] 3. After the heat preservation is over, put the iron-chromium-aluminum wire into water to cool to room temperature within 15 seconds.
[0034] Elongation: According to GB / T 1234 inspection, the elongation of the Fe-Cr-Al wire after the heat treatment method in Example 1 is 27%.
Embodiment 2
[0040] Heat treatment object: the same as Comparative Example 2, that is, a hot-rolled iron-chromium-aluminum wire rod with a brand name of 0Cr20Al6RE, a diameter of φ5.5 mm, and a mass of 1 ton.
[0041] Heat treatment method:
[0042] 1. Raise the temperature of the gas heating furnace from room temperature to 900°C, and the heating rate is 12°C / min;
[0043] 2. Before the furnace temperature of the gas heating furnace drops to 750°C, put the above-mentioned iron-chromium-aluminum wire into the heated gas heating furnace, and then raise the temperature of the gas heating furnace to 860°C at a heating rate of 5°C / min, and keep it warm for 30 minute;
[0044] 3. After the heat preservation is over, put the iron-chromium-aluminum wire into water to cool to room temperature within 30 seconds.
[0045] Elongation: According to GB / T 1234 inspection, the elongation of the Fe-Cr-Al wire after the heat treatment method in Example 2 is 30%.
Embodiment 3
[0051] Heat treatment object: the same as Comparative Example 3, that is, a hot-rolled iron-chromium-aluminum wire rod with a brand name of 0Cr21Al6Nb, a diameter of φ8 mm, and a mass of 1.5 tons.
[0052] Heat treatment method:
[0053] 1. Raise the temperature of the natural gas heating furnace from room temperature to 920°C, and the heating rate is 15°C / min;
[0054] 2. Before the furnace temperature of the natural gas heating furnace drops to 712°C, put the above-mentioned iron-chromium-aluminum wire into the heated natural gas heating furnace, and then raise the temperature of the natural gas heating furnace to 920°C at a heating rate of 5°C / min, and keep it warm for 1 Hour;
[0055] 3. After the heat preservation is over, put the iron-chromium-aluminum wire into water to cool to room temperature within 40 seconds.
[0056] Elongation: According to GB / T 1234 inspection, the elongation of the Fe-Cr-Al wire rod treated by the heat treatment method in Example 3 is 26%.
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