Method for preparing copper and nickel alloy seamless copper tube

Abstract

The invention relates to a copper nickel seamless copper tube with 92. 9-93. 6% copper and 6. 4-7. 1% nickel. It takes electrolytic copper and nickel to a low frequency electric oven to heat to 1320-1340deg.C, casting into solid ingot which is heated to 650-750deg.C for heat piercing to get the surface smooth ingot to heat to 650-750deg.C for squeezing to gross blank tube which is extended and peeled for cold reeling, to get the size of the product after annealing. Through calibration and rectification, cleaning and annealing, the product is inspected and put to stock. The content for nickel is 6. 4-7. 1%. It is better in processing feature due to the low nickel and better in corrosion resistant features than copper due to the content of nickel. It is also low in cost.

Description

technical field

[0001] The invention relates to a method for preparing a copper-nickel alloy seamless copper pipe. Mainly used in heat exchangers in power stations, ships, refrigeration and other industries as heat exchange tubes. Background technique

[0002] At present, with the development of power stations, ships, and refrigeration industries, it is necessary to find a heat exchange tube material with low cost, good corrosion resistance and processing performance. The original heat exchange tubes were mostly brass tubes, high nickel white copper tubes or red copper tubes. However, brass tubes, high-nickel white copper tubes and copper tubes all have their shortcomings, which are described below:

[0003] 1. Brass tubes: The cost of brass tubes is relatively low, but the corrosion resistance and processing performance are not as good as those of white copper tubes. Generally, a batch needs to be repaired and replaced in about three years. The maintenance cost of power ...

Examples

Embodiment Construction

[0023] The invention relates to a copper-nickel alloy seamless copper pipe and a preparation method thereof. The material is made of electrolytic copper and electrolytic nickel, the copper content is 92.9-93.6%, and the nickel content is 6.4-7.1%. The specific preparation method is as follows:

[0024] 1. Melting and casting copper and nickel into ingots: Take 465kg of electrolytic copper and 35kg of electrolytic nickel, place them in a low-frequency electric furnace, heat them to 1320-1340°C, and cast them into solid ingots of φ80×230mm.

[0025] 2. Piercing: Heating the solid ingot to 650-750°C, and piercing in an 80t piercing machine.

[0026] 3. Light blank: the perforated blank is processed on a light blank lathe, and the oxide layer on the outer surface is polished to make a light blank.

[0027] 4. Extrusion: heat the blank to 650-750°C, and extrude it into a φ42×4.5mm blank tube on a 400t extruder.

[0028] 5. Stretching: Stretch the blank tube to φ38×3.9mm first, t...

technical field

[0001] The invention relates to a method for preparing a copper-nickel alloy seamless copper pipe. Mainly used in heat exchangers in power stations, ships, refrigeration and other industries as heat exchange tubes. Background technique

[0002] At present, with the development of power stations, ships, and refrigeration industries, it is necessary to find a heat exchange tube material with low cost, good corrosion resistance and processing performance. The original heat exchange tubes were mostly brass tubes, high nickel white copper tubes or red copper tubes. However, brass tubes, high-nickel white copper tubes and copper tubes all have their shortcomings, which are described below:

[0003] 1. Brass tubes: The cost of brass tubes is relatively low, but the corrosion resistance and processing performance are not as good as those of white copper tubes. Generally, a batch needs to be repaired and replaced in about three years. The maintenance cost of power ...

Examples

Embodiment Construction

[0023] The invention relates to a copper-nickel alloy seamless copper pipe and a preparation method thereof. The material is made of electrolytic copper and electrolytic nickel, the copper content is 92.9-93.6%, and the nickel content is 6.4-7.1%. The specific preparation method is as follows:

[0024] 1. Melting and casting copper and nickel into ingots: Take 465kg of electrolytic copper and 35kg of electrolytic nickel, place them in a low-frequency electric furnace, heat them to 1320-1340°C, and cast them into solid ingots of φ80×230mm.

[0025] 2. Piercing: Heating the solid ingot to 650-750°C, and piercing in an 80t piercing machine.

[0026] 3. Light blank: the perforated blank is processed on a light blank lathe, and the oxide layer on the outer surface is polished to make a light blank.

[0027] 4. Extrusion: heat the blank to 650-750°C, and extrude it into a φ42×4.5mm blank tube on a 400t extruder.

[0028] 5. Stretching: Stretch the blank tube to φ38×3.9mm first, t...