A non-vacuum melting horizontal continuous casting production process for high-strength and high-conductivity cu-cr-zr alloy rods

Abstract

The invention provides a non-vacuum melting horizontal continuous casting production technology for a high-strength high-conductivity Cu-Cr-Zr alloy rod and belongs to the technical field of metallic material preparation and processing. According to the horizontal continuous casting production technology provided by the invention, the measures, such as, atmosphere protection and addition of a covering agent and a refining agent, are taken in a non-vacuum melting furnace, so that the problem of easy oxidization of molten Cu-Cr-Zr can be effectively solved and the problems of high equipment cost and limited melting capacity brought by a conventional vacuum furnace can be solved. Besides, the application of the horizontal continuous casting production technology provided by the invention for producing the Cu-Cr-Zr alloy rod is favorable for discharging impurities and solidified separated gas in the molten alloy into a liquid phase and promoting the rod tissue compactness; high-axial oriented columnar crystals can be acquired, and the subsequent cold processing performance of the alloy rod can be promoted; and the production technology can realize the high-quality continuous casting for the high-strength high-conductivity copper alloy rod characterized by heavy weight and long size and having easily oxidized and segregated elements.

Description

Technical field:

[0001] The invention relates to a high-performance copper alloy preparation technology, which belongs to the technical field of metal material preparation and processing, and in particular provides a non-vacuum smelting horizontal continuous casting production process for high-strength and high-conductivity Cu-Cr-Zr alloy rods. Background technique:

[0002] Cu-Cr-Zr alloy (0.1%~1.4% Cr, 0.02%~0.20% Zr, impurity <0.2%) has high strength and excellent electrical and thermal conductivity, high softening temperature resistance and good wear resistance , widely used in electronic component connectors, lead frames, high-speed railway contact wires, water-cooled crystallizers, etc., is a key material for national economic construction and national defense military development.

[0003] At present, the main preparation methods of Cu-Cr-Zr alloy rods at home and abroad are: vacuum melting casting and cold rolling method, vacuum vertical semi-continuous casting ho...

Examples

Embodiment 1

[0028] Example 1: Continuous casting of Cu-1.0%Cr-0.16%Zr alloy rods with a diameter of Φ30mm

[0029] (1) Add a Cu-Cr-Zr alloy containing 1.0wt% Cr, 0.16wt% Zr, and impurity <0.2wt% into the melting furnace, heat it to 1350°C and melt it, and protect it with argon in the alloy melting and solidification interval;

[0030] (2) Applying Al to the inner surface of the graphite mold2 o 3 coating;

[0031] (3) Start the mold heating device and cooling device, heat the mold heating section to 1300°C, and the cooling water flow rate of the water-cooled crystallizer is 600L / h;

[0032] (4) Lift the stopper, transfer the molten metal through the draft tube into the holding furnace, close the stopper, and the smelting system continues to smelt the Cu-Cr-Zr alloy;

[0033] (5) The temperature of the holding furnace is set to 1300°C, and left to stand for 0.6h;

[0034] (6) Start the horizontal traction mechanism and the water spray secondary cooling device at the mold outlet (water f...

Embodiment 2

[0035] Example 2: Continuous casting of Cu-0.5%Cr-0.08%Zr alloy rod with diameter Φ50mm

[0036] (1) Add the Cu-Cr-Zr alloy containing 0.5wt% Cr, 0.08wt% Zr, and impurity<0.2wt% into the melting furnace, heat to 1300°C for melting, and add covering agent and refining agent;

[0037] (2) Applying Al to the inner surface of the graphite mold 2 o 3 coating;

[0038] (3) Start the mold heating device and cooling device, heat the mold heating section to 1250°C, and the cooling water flow rate of the water-cooled crystallizer is 800L / h;

[0039] (4) Lift the stopper, transfer the molten metal through the draft tube into the holding furnace, close the stopper, and the smelting system continues to smelt the Cu-Cr-Zr alloy;

[0040] (5) The temperature of the holding furnace is set to 1250°C, and it is left to stand for 0.4h;

[0041] (6) Start the horizontal traction mechanism and the water spray secondary cooling device at the mold outlet (water flow rate: 500L / h), and carry out ...

Embodiment 3

[0042] Example 3: Continuous casting of Cu-0.2%Cr-0.04%Zr alloy rods with a diameter of Φ80mm

[0043] (1) Put the Cu-Cr-Zr alloy containing 0.2wt% Cr, 0.04wt% Zr, and impurity<0.2wt% into the melting furnace, heat to 1250°C to melt, add covering agent and refining agent;

[0044] (2) BN coating is applied to the inner surface of the graphite mold;

[0045] (3) Start the mold heating device and cooling device, heat the mold heating section to 1200°C, and the cooling water flow rate of the water-cooled crystallizer is 1000L / h;

[0046] (4) Lift the stopper, transfer the molten metal through the draft tube into the holding furnace, close the stopper, and the smelting system continues to smelt the Cu-Cr-Zr alloy;

[0047] (5) The temperature of the holding furnace is set to 1200°C, and it is left to stand for 0.5h;

[0048] (6) Start the horizontal traction mechanism and the water spray secondary cooling device at the mold outlet (water flow: 800L / h), and carry out continuous c...

Technical field:

[0001] The invention relates to a high-performance copper alloy preparation technology, which belongs to the technical field of metal material preparation and processing, and in particular provides a non-vacuum smelting horizontal continuous casting production process for high-strength and high-conductivity Cu-Cr-Zr alloy rods. Background technique:

[0002] Cu-Cr-Zr alloy (0.1%~1.4% Cr, 0.02%~0.20% Zr, impurity <0.2%) has high strength and excellent electrical and thermal conductivity, high softening temperature resistance and good wear resistance , widely used in electronic component connectors, lead frames, high-speed railway contact wires, water-cooled crystallizers, etc., is a key material for national economic construction and national defense military development.

[0003] At present, the main preparation methods of Cu-Cr-Zr alloy rods at home and abroad are: vacuum melting casting and cold rolling method, vacuum vertical semi-continuous casting ho...

Examples

Embodiment 1

[0028] Example 1: Continuous casting of Cu-1.0%Cr-0.16%Zr alloy rods with a diameter of Φ30mm

[0029] (1) Add a Cu-Cr-Zr alloy containing 1.0wt% Cr, 0.16wt% Zr, and impurity <0.2wt% into the melting furnace, heat it to 1350°C and melt it, and protect it with argon in the alloy melting and solidification interval;

[0030] (2) Applying Al to the inner surface of the graphite mold2 o 3 coating;

[0031] (3) Start the mold heating device and cooling device, heat the mold heating section to 1300°C, and the cooling water flow rate of the water-cooled crystallizer is 600L / h;

[0032] (4) Lift the stopper, transfer the molten metal through the draft tube into the holding furnace, close the stopper, and the smelting system continues to smelt the Cu-Cr-Zr alloy;

[0033] (5) The temperature of the holding furnace is set to 1300°C, and left to stand for 0.6h;

[0034] (6) Start the horizontal traction mechanism and the water spray secondary cooling device at the mold outlet (water f...

Embodiment 2

[0035] Example 2: Continuous casting of Cu-0.5%Cr-0.08%Zr alloy rod with diameter Φ50mm

[0036] (1) Add the Cu-Cr-Zr alloy containing 0.5wt% Cr, 0.08wt% Zr, and impurity<0.2wt% into the melting furnace, heat to 1300°C for melting, and add covering agent and refining agent;

[0037] (2) Applying Al to the inner surface of the graphite mold 2 o 3 coating;

[0038] (3) Start the mold heating device and cooling device, heat the mold heating section to 1250°C, and the cooling water flow rate of the water-cooled crystallizer is 800L / h;

[0039] (4) Lift the stopper, transfer the molten metal through the draft tube into the holding furnace, close the stopper, and the smelting system continues to smelt the Cu-Cr-Zr alloy;

[0040] (5) The temperature of the holding furnace is set to 1250°C, and it is left to stand for 0.4h;

[0041] (6) Start the horizontal traction mechanism and the water spray secondary cooling device at the mold outlet (water flow rate: 500L / h), and carry out ...

Embodiment 3

[0042] Example 3: Continuous casting of Cu-0.2%Cr-0.04%Zr alloy rods with a diameter of Φ80mm

[0043] (1) Put the Cu-Cr-Zr alloy containing 0.2wt% Cr, 0.04wt% Zr, and impurity<0.2wt% into the melting furnace, heat to 1250°C to melt, add covering agent and refining agent;

[0044] (2) BN coating is applied to the inner surface of the graphite mold;

[0045] (3) Start the mold heating device and cooling device, heat the mold heating section to 1200°C, and the cooling water flow rate of the water-cooled crystallizer is 1000L / h;

[0046] (4) Lift the stopper, transfer the molten metal through the draft tube into the holding furnace, close the stopper, and the smelting system continues to smelt the Cu-Cr-Zr alloy;

[0047] (5) The temperature of the holding furnace is set to 1200°C, and it is left to stand for 0.5h;

[0048] (6) Start the horizontal traction mechanism and the water spray secondary cooling device at the mold outlet (water flow: 800L / h), and carry out continuous c...

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