A kind of preparation method of anti-dezincification lead-free bismuth arsenic brass tube

Abstract

The invention relates to the field of copper alloys for toilet and kitchen industries, and provides a preparation method of an anti-dezincification lead-free bismuth arsenic brass pipe. The preparation method comprises the steps of casting as a copper ingot-extrusion as a copper pipe blank-stretching-annealing-inspection of a finished copper pipe-warehousing of the finished copper pipe after smelting of the following raw materials in percentage by mass: 61-63% of Cu, 0.5-0.9% of Bi, 0.07-0.12% of As, 0.5-0.8% of Al, 0.08-0.24% of Sn, Pb not more than 0.1%, and the balance of Zn and impuritieswith a total amount not more than 0.25%.

Description

technical field

[0001] The invention relates to the field of copper alloys used in the bathroom and kitchen industry, in particular to a preparation method of a dezincification-resistant lead-free bismuth-arsenic brass tube. Background technique

[0002] Lead brass (common grade is HPb59-1) has become the first choice copper alloy material for bathroom and kitchen hardware because of its good casting molding, cutting, grinding and polishing and mechanical properties, and is widely used. The Zn content of this type of brass exceeds 36%, and it is prone to dezincification corrosion during use, especially in marine climate conditions, which directly affects the life of bathroom and kitchen hardware products. Australia has formulated AS2345~2006 "Dezincification resistance of copper alloys", which stipulates that the dezincification layer of brass castings shall not exceed 100μm. However, practice has proved that for general leaded brass (whether processed copper or cast copper...

Examples

Embodiment 1

[0027] A kind of anti-dezincification lead-free bismuth arsenic brass is characterized in that: be made up of the raw material of following mass percent:

[0028] Cu61%, Bi0.5%, As0.07%, Al0.5%, Sn0.08%, Pb0.06%, Zn37.75% and total 0.04% impurities.

[0029] A method for preparing a dezincification-resistant lead-free bismuth-arsenic brass tube, including casting the brass liquid with the above mass percentage into a copper ingot → extruding into a copper tube billet → stretching → annealing → inspection of the finished copper tube → finished product The step of copper pipe warehousing; Wherein, the step of introducing and casting copper ingots includes:

[0030] 1) First add 150kg of pure copper rice into the cored power frequency furnace. The total amount of pure copper rice in the power frequency furnace is 7.5% of the total raw materials. When it is in a semi-molten state, press it into the preheated 0.08% tin ingot, 0.5% bismuth ingot and 0.5% aluminum ingot accounted fo...

Embodiment 2

[0047] A kind of anti-dezincification lead-free bismuth-arsenic brass is made up of the following raw materials in mass percentage: Cu62%, Bi0.7%, As0.1%, Al0.7%, Sn0.15%, Pb0.09%, Zn36 .12% and total 0.14% impurities.

[0048] A method for preparing a dezincification-resistant lead-free bismuth-arsenic brass tube, including casting the brass liquid with the above mass percentage into a copper ingot → extruding into a copper tube billet → stretching → annealing → inspection of the finished copper tube → finished product The step of copper pipe warehousing; Wherein, the step of introducing and casting copper ingots includes:

[0049] 1) First add 200kg of pure red copper rice into the cored power frequency furnace. The total amount of pure red copper rice in the power frequency furnace is 10% of the total raw materials. When it is in a semi-molten state, press it into the preheated 0.15% tin ingot, 0.7% bismuth ingot and 0.7% aluminum ingot accounted for the total raw material...

Embodiment 3

[0061] A dezincification-resistant lead-free bismuth-arsenic brass, consisting of the following raw materials in mass percentage: Cu63%, Bi0.9%, As0.12%, Al0.8%, Sn0.24%, Pb0.02%, Zn34 .84% and a total of 0.08% impurities.

[0062]A method for preparing a dezincification-resistant lead-free bismuth-arsenic brass tube, including casting the brass liquid with the above mass percentage into a copper ingot → extruding into a copper tube billet → stretching → annealing → inspection of the finished copper tube → finished product The step of copper pipe warehousing; Wherein, the step of introducing and casting copper ingots includes:

[0063] 1) First add 300kg of pure copper rice into the cored power frequency furnace. The total amount of pure copper rice in the power frequency furnace is 15% of the total raw materials. When it is in a semi-molten state, press it into the preheated 0.24% tin ingot, 0.9% bismuth ingot and 0.8% aluminum ingot accounted for the total raw material, ful...

technical field

[0001] The invention relates to the field of copper alloys used in the bathroom and kitchen industry, in particular to a preparation method of a dezincification-resistant lead-free bismuth-arsenic brass tube. Background technique

[0002] Lead brass (common grade is HPb59-1) has become the first choice copper alloy material for bathroom and kitchen hardware because of its good casting molding, cutting, grinding and polishing and mechanical properties, and is widely used. The Zn content of this type of brass exceeds 36%, and it is prone to dezincification corrosion during use, especially in marine climate conditions, which directly affects the life of bathroom and kitchen hardware products. Australia has formulated AS2345~2006 "Dezincification resistance of copper alloys", which stipulates that the dezincification layer of brass castings shall not exceed 100μm. However, practice has proved that for general leaded brass (whether processed copper or cast copper...

Examples

Embodiment 1

[0027] A kind of anti-dezincification lead-free bismuth arsenic brass is characterized in that: be made up of the raw material of following mass percent:

[0028] Cu61%, Bi0.5%, As0.07%, Al0.5%, Sn0.08%, Pb0.06%, Zn37.75% and total 0.04% impurities.

[0029] A method for preparing a dezincification-resistant lead-free bismuth-arsenic brass tube, including casting the brass liquid with the above mass percentage into a copper ingot → extruding into a copper tube billet → stretching → annealing → inspection of the finished copper tube → finished product The step of copper pipe warehousing; Wherein, the step of introducing and casting copper ingots includes:

[0030] 1) First add 150kg of pure copper rice into the cored power frequency furnace. The total amount of pure copper rice in the power frequency furnace is 7.5% of the total raw materials. When it is in a semi-molten state, press it into the preheated 0.08% tin ingot, 0.5% bismuth ingot and 0.5% aluminum ingot accounted fo...

Embodiment 2

[0047] A kind of anti-dezincification lead-free bismuth-arsenic brass is made up of the following raw materials in mass percentage: Cu62%, Bi0.7%, As0.1%, Al0.7%, Sn0.15%, Pb0.09%, Zn36 .12% and total 0.14% impurities.

[0048] A method for preparing a dezincification-resistant lead-free bismuth-arsenic brass tube, including casting the brass liquid with the above mass percentage into a copper ingot → extruding into a copper tube billet → stretching → annealing → inspection of the finished copper tube → finished product The step of copper pipe warehousing; Wherein, the step of introducing and casting copper ingots includes:

[0049] 1) First add 200kg of pure red copper rice into the cored power frequency furnace. The total amount of pure red copper rice in the power frequency furnace is 10% of the total raw materials. When it is in a semi-molten state, press it into the preheated 0.15% tin ingot, 0.7% bismuth ingot and 0.7% aluminum ingot accounted for the total raw material...

Embodiment 3

[0061] A dezincification-resistant lead-free bismuth-arsenic brass, consisting of the following raw materials in mass percentage: Cu63%, Bi0.9%, As0.12%, Al0.8%, Sn0.24%, Pb0.02%, Zn34 .84% and a total of 0.08% impurities.

[0062]A method for preparing a dezincification-resistant lead-free bismuth-arsenic brass tube, including casting the brass liquid with the above mass percentage into a copper ingot → extruding into a copper tube billet → stretching → annealing → inspection of the finished copper tube → finished product The step of copper pipe warehousing; Wherein, the step of introducing and casting copper ingots includes:

[0063] 1) First add 300kg of pure copper rice into the cored power frequency furnace. The total amount of pure copper rice in the power frequency furnace is 15% of the total raw materials. When it is in a semi-molten state, press it into the preheated 0.24% tin ingot, 0.9% bismuth ingot and 0.8% aluminum ingot accounted for the total raw material, ful...

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