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A kind of preparation method of fine-grained chrome bronze

A crystallized chrome bronze and crystallizer technology, which is applied in the field of fine-grained chrome bronze preparation, can solve the problems of low qualified rate, large chrome bronze grains, and insufficient surface quality, and achieve the effect of improving surface quality and good surface quality

Active Publication Date: 2018-09-21
SIRUI ADVANCED COPPER ALLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is to provide a preparation method of fine-grained chromium bronze, which solves the problems of large grain size, low qualified rate and insufficient surface quality of chromium bronze in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for preparing fine-grained chromium bronze, the chemical composition of which is calculated by weight percentage: Cr: 0.8%, Cu: balance, impurity control requirements: Fe≤0.03%, other ≤0.1%; non-vacuum semi Continuous casting, the casting temperature of non-vacuum semi-continuous casting is 1200°C; mix the Cu powder, Cr powder, and Fe powder in the weight percentage evenly, and send them into the non-vacuum casting furnace, chemical material (gas protection) → degassing → blending Composition → deoxidation → out of the furnace, after being out of the furnace, it is sent to the crystallizer, and the water inlet of the crystallizer is characterized by: four channels are divided into eight channels, and the water enters the crystallizer through 32 water holes; the cooling water tank of the crystallizer is 10mm wide and 9mm deep; the water outlet hole The cross-sectional area of ​​the water tank / the cross-sectional area of ​​the water outlet = 4; the primary cool...

Embodiment 2

[0020] A method for preparing fine-grained chromium bronze, the chemical composition of which is calculated by weight percentage: Cr: 0.9%, Cu: balance, impurity control requirements: Fe≤0.03%, other ≤0.1%; non-vacuum semi Continuous casting, the casting temperature of non-vacuum semi-continuous casting is 1250°C; mix the Cu powder, Cr powder, and Fe powder in the weight percentage evenly, and send them into the non-vacuum casting furnace, chemical material (gas protection) → degassing → blending Composition → deoxidation → out of the furnace, after being out of the furnace, it is sent to the crystallizer, and the water inlet of the crystallizer is characterized by: four channels are divided into eight channels, and the water enters the crystallizer through 32 water holes; the cooling water tank of the crystallizer is 10mm wide and 9mm deep; the water outlet hole The cross-sectional area of ​​the water tank / the cross-sectional area of ​​the water outlet = 4; the primary cool...

Embodiment 3

[0023] A preparation method of fine-grained chromium bronze, the chemical composition of which is calculated by weight percentage: Cr: 1.0%, Cu: balance, impurity control requirements: Fe≤0.03%, other ≤0.1%; non-vacuum semi Continuous casting, the casting temperature of non-vacuum semi-continuous casting is 1300°C; mix the Cu powder, Cr powder, and Fe powder in the weight percentage evenly, and send them into the non-vacuum casting furnace, chemical material (gas protection) → degassing → blending Composition → deoxidation → out of the furnace, after being out of the furnace, it is sent to the crystallizer, and the water inlet of the crystallizer is characterized by: four channels are divided into eight channels, and the water enters the crystallizer through 32 water holes; the cooling water tank of the crystallizer is 10mm wide and 9mm deep; the water outlet hole The cross-sectional area of ​​the water tank / the cross-sectional area of ​​the water outlet = 4; the primary coo...

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Abstract

The invention discloses a preparation method of fine grain chromium bronze. The fine grain chromium bronze is composed, by weight, 0.8-1.0% of Cr and the balance Cu; and impurities are controlled according to the requirements that the content of Fe is smaller than or equal to 0.03%, and the content of other substances is smaller than or equal to 0.1%. Non-vacuum semi-continuous casting is conducted according to the constituents, Cu powder, Cr powder and Fe powder of the certain weight percentage are mixed evenly and fed into a non-vacuum casting furnace, material melting (gas protection), degassing, constituent proportioning, deoxygenation and discharging are conducted sequentially, the mixture is fed into a crystallizer after being discharged, cooling is conducted in the mode of combining electromagnetic stirring with vibration casting, and the fine grain chromium bronze is obtained. According to the preparation method, electromagnetic stirring and vibration casting are combined; and by adjusting the vibration frequency and designing the height and the installation position of an electromagnetic stirrer, according to the position and depth of a liquid cave in the crystallization process, the surface quality of a chromium bronze cast ingot can be effectively improved, and the chromium bronze cast ingot which is good in surface quality and fine in grain size is obtained. The percent of pass is increased from 60% to 85%, the equiaxial crystal ratio is increased from 30% to 70%, and the grain size is refined from 5-10 mm to 1-5 mm.

Description

technical field [0001] The invention relates to the technical field of chromium bronze manufacture, in particular to a preparation method of fine-grained chromium bronze. Background technique [0002] Chromium bronze is a copper alloy containing 0.4%-1.1% Cr. Chromium bronzes can be strengthened by quenching-aging or quenching-cold deformation-aging. At the eutectic temperature of 1072°C, the maximum solubility of chromium in copper is 0.65%. With the decrease of temperature, the solid solubility drops sharply, and the Cr particle phase precipitates out after solid solution aging treatment. The addition of chromium, on the one hand, significantly increases the recrystallization temperature and thermal strength of the alloy; on the other hand, the conductivity of copper decreases slightly. The conductivity of the solution-treated chromium bronze rod is 45% IACS, which rises to 80% IACS after aging treatment. The softening temperature of aged chrome bronze is 400°C, twice ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C1/02B22D11/115B22D11/114
CPCB22D11/114B22D11/115C22C1/02C22C9/00
Inventor 孙君鹏韩旺庆梁相博
Owner SIRUI ADVANCED COPPER ALLOY CO LTD