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Cuprum and copper alloy continuous casting method

A copper alloy and continuous casting technology, applied in the field of copper material processing, can solve the problems of micro-cracks in the core, scrapped processed products, cracks in continuous castings, etc., and achieve the effects of shallow liquid cavity depth, low average temperature, and not easy to crack.

Active Publication Date: 2009-11-18
NINGBO UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the existing copper and copper alloys regenerated from scrap copper, sometimes the surface of the continuous casting is not cracked at a higher temperature, but there are many microcracks in the center, resulting in the scrapping of subsequent processed products.
[0006] Recycled continuous casting of copper and copper alloys, mainly columnar crystals, often cracks during continuous casting, and the cracks seriously affect the yield of copper alloy parts, resulting in a large waste of energy
Therefore, it is very urgent to develop a continuous casting method for copper and copper alloys to overcome the phenomenon that cracks often occur in the continuous castings prepared by the existing scrap copper recycling copper and copper alloy continuous casting technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Using scrap copper to smelt brass HPb59-1, the average temperature of the alloy melt entering the crystallizer at the front end of the cooling zone near the furnace is 25°C higher than the liquidus temperature; the diameter of the continuous casting rod is 150mm, and the continuous casting is less than Secondary water cooling at 500°C, continuous casting speed 350mm / min. There is no crack on the surface of the continuous casting rod, and there is no crack inside the flaw detection inspection; the metallographic observation is all equiaxed crystals.

Embodiment 2

[0019] Using scrap copper to smelt tin phosphor bronze, the average temperature of the alloy melt entering the crystallizer at the front end of the cooling zone in the furnace is controlled to be 40°C higher than its liquidus melting temperature. The continuous casting is a slab of 220mmX23mm, without secondary water cooling, and the continuous casting speed is 120mm / min. There is no crack on the surface of the continuous casting slab, and there is no crack in the interior after flaw detection; 95% of the volume of the metallographic observation structure is equiaxed crystals, and the rest is columnar crystals.

example 3

[0021] Use scrap copper to smelt brass HPb61-3, and control the average temperature of the alloy melt entering the crystallizer at the front end of the cooling zone near the furnace to be 20°C higher than the melting temperature of the liquidus line; the outer diameter of the brass pipe fittings is 40mm, and the inner diameter The diameter is 35mm, without secondary water cooling, and the continuous casting speed is 600mm / min. No cracks were found in the surface and internal inspection and flaw detection of the continuous casting pipe. Metallographic inspection of continuous casting tubes shows that 100% are equiaxed grains.

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PUM

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Abstract

The invention belongs to the field of copper alloy processing. Aiming at the problem that the continuous casting of copper or copper alloy material regenerated from waste miscellaneous copper or copper alloy material is easy to be thermally cracked and the yield rate is low, the invention adopts the alloy melt that is controlled to enter the graphite crystallizer lined with water-cooled copper sleeve The average temperature of the front end surface of the cooling zone in the furnace is only 2-40°C higher than the alloy liquidus temperature, and the equiaxed crystals account for 60-100%, preferably 80-100% of the continuous casting structure along the direction opposite to the continuous casting traction The direction is solidified in sequence. When there is no secondary water cooling, the continuous casting speed is 20-1500mm / min. When the secondary water cooling is performed on the outer surface of the continuous casting at less than 500°C, the continuous casting speed is 20-2500mm / min, and the continuous casting has no cracks. , The pass rate of the product is 100%.

Description

technical field [0001] The invention discloses a copper and copper alloy continuous casting method, which belongs to the field of copper material processing. Background technique [0002] Existing copper and copper alloy continuous casting technology, such as the authorized patent CN1657199 "Process method and crystallizer for producing iron-bronze alloy strip blank by horizontal continuous casting method" (authorized announcement date August 24, 2005), melting temperature 1190 ~ 1210°C, then pour the alloy liquid into the holding furnace, and the continuous casting temperature is 1125-1135°C. Another example is the authorized patent CN1250352C "Preparation method of ultra-fine wire of non-ferrous metals and their alloy materials" (authorized announcement date April 12, 2006). 50~100℃. [0003] In the prior art, the temperature of the copper and copper alloy melt entering the water-cooled crystallizer is generally 50-200°C higher than the liquidus melting temperature. Due...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/18B22D21/00
Inventor 刘新才王永如潘晶张学士张荣华楼春章张建华洪燮平
Owner NINGBO UNIV