Method for smelting nitrogenous Co-Cr-Mo alloy for surgical implanting through electroslag remelting furnace

The technology of cobalt-chromium-molybdenum alloy and electroslag remelting furnace is applied in the field of metallurgy, which can solve the problem of high content of easily segregated elements in the alloy, and achieve the effects of improving the yield of ingots, uniform distribution of head and tail, and good desulfurization effect.

Inactive Publication Date: 2015-12-09
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, for electroslag remelted high-nitrogen-cobalt-chromium-molybdenum alloys, it is necessary to solve the high content of easily segregated elements (such as molybdenum) in the alloy and the segregation of the ingot caused by improper process selection. At the same time, it is necessary to strictly control the burning loss and The uniformity of its distribution puts forward higher requirements for the smelting process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0056] The content and distribution of nitrogen in the electrode are shown in Table 2:

[0057] Table 2 Nitrogen content and distribution in cobalt-chromium-molybdenum electrode rods

[0058] Sampling position (from beginning to end)

1

2

3

content

0.20

0.21

0.20

[0059] Electrode size:

[0060] Crystallizer diameter:

[0061] Slag material adopts quaternary slag: CaF 2 : 45-55%, CaO: 25-30%, Al 2 o 3 : 15-20%, MgO: 3-5%. The amount of slag is 55kg;

[0062] I electrode and slag preparation

[0063] The electrode rod and the dummy electrode are welded together, and 60kg of heavy molten slag is added to the automatic slag feeder; the arc starting ingot uses cobalt-chromium-molybdenum alloy slices with a diameter of 350mm and a thickness of about 26mm.

[0064] II Combined Furnace Filled with Nitrogen

[0065] 100L / min continuous supply of nitrogen for 5 minutes, then turn off the gas supply, and turn on the cooling wat...

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Abstract

The invention belongs to the field of metallurgy and relates to a method for smelting nitrogenous Co-Cr-Mo alloy for surgical implanting through an electroslag remelting furnace. The method comprises the following steps: I, preparing an electrode and slag charge, welding a Co-Cr-Mo alloy stun rod and an artificial electrode together, and using a slag charge feeder to add the slag charge to be remelted; II, closing the furnace and filling nitrogen continuously for 2 minutes and then stopping nitrogen supply, and starting a cooling circulation system; III, arcing and slugging, and adopting a power, current, voltage and slag resistance comprehensive control method; IV, after slag charge adding, supplying nitrogen continuously; V, after the finish of an arcing period, starting a melting period, adopting a melting speed and slag swing control method, and stabilizing the melting speed to be 5kg/min; VI, adopting a stepped power reduction method during a hot top sealing process; and VII, cooling and demoulding inside the furnace. The Co-Cr-Mo alloy remelted by adopting the method is excellent in ESR ingot segregation control, N element is evenly distributed, the burning loss is less than 5 percent, the content of sulphur is lower than 10 ppm, and the ingot surface is free from the defect of slag troughs.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to a method for smelting nitrogen-containing cobalt-chromium-molybdenum alloys for surgical implants in an electroslag furnace. Background technique [0002] Cobalt-chromium-molybdenum alloy has excellent mechanical properties, corrosion resistance and biocompatibility, and is an important material for orthopedic metal implants. The forged cobalt-chromium-molybdenum alloy is used in high-end cobalt-chromium-molybdenum artificial joints because of its more excellent mechanical properties. [0003] ISO5832-12:2007 for wrought cobalt-chromium-molybdenum alloy in the ISO cobalt-based alloy standard stipulates the standard composition of high-carbon and low-carbon alloys, as shown in Table 1: [0004] Table 1 chemical composition [0005] C Cr Mo Fe mn Si Ni N co low carbon ≤0.14 26.0～30.0 5.0～7.0 ≤0.75 ≤1.0 ≤1.0 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18C22C1/02C22C19/07
Inventor 于昂李超孟宇张华霞唐辉
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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