High-temperature alloy core rod applied to planetary rolling mill for rolling copper and copper and preparation method of high-temperature alloy core rod

Abstract

The invention relates to a high-temperature alloy core rod applied to planetary rolling mill for rolling copper and copper and a preparation method of the high-temperature alloy core rod, and belongsto the technical field of metal machining. The high-temperature alloy core rod comprises 11.50-14.00% of Cr, 3.80-5.2% of Mo, 5.50-6.50% of Al, 0.50-1.00% of Ti, 1.80-2.80% of Nb and Ta, 0.005-0.020%of B, 0.08-0.20% of C, 0.050-0.20% of Zr, 0-0.50% of Si, 0-0.50% of Mn, 0-0.015% of P, 0-0.015% of S, 0-2.50% of Fe and the balance Ni. In the preparation process, a mother alloy cast ingot is prepared through vacuum induction smelting, vacuum induction remelting is carried out, a high-temperature alloy core rod blank is prepared through investment casting, the blank is subjected to hot isostaticpressure treatment and subsequent heat treatment, then the blank is polished and subjected to finish machining, and finally the core rod is subjected to surface aluminizing treatment to improve the surface hardness and corrosion resistance at high temperature. The high-temperature alloy core rod prepared through the preparation method has relatively high comprehensive mechanical property, long infatigue life and high in high-temperature strength, the service life of a die is obviously prolonged, the preparation process is simple, and the process is short.

Description

technical field [0001] The invention relates to a high-temperature alloy mandrel used for rolling copper and copper alloys in a planetary rolling mill and a preparation method thereof, belonging to the technical field of metal processing. Background technique [0002] The technology of rolling hollow copper and copper alloy ingots in a three-roll planetary rolling mill is a technical method for efficiently preparing copper and copper alloy pipes. Compared with the technology of preparing statistical copper alloy pipes by hot extrusion, the technology of rolling hollow copper ingots by planetary rolling mill has the following advantages: (1) high yield; (2) significantly improved production efficiency; (3) low production cost and energy saving effect Obviously; (4) It can prepare short tubes, long tubes, small and large copper and copper alloy tubes. [0003] However, in the actual production process, the planetary rolling mill has matured the copper tube rolling process, an...

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Problems solved by technology

[0003] However, in the actual production process, the planetary rolling mill has matured the copper tube rolling process, and the mandrel adopts H13 material and domestic Y4 material, which can meet the use requirements.

When rolling copper alloys, the requirements for mandrels are higher, and the more mature ones are used for the rolling of brass tubes, but the service life of the supporting mandrels is still low, while for other copper alloys such as white copper tubes The rolling mandrel of the pipe is more demanding

Mandrels made of materials such as H13 and Y4 generate a lot of heat during the rolling process, and the temperature rises sharply, causing the outer surface of the mandrel to stick to copper. Especially when rolling copper alloys, due to the high rolling temperature, the sticking The copper is extremely serious, and the outer surface of the mandrel needs to be ground every time one is rolled, which seriously affects the production efficiency

And the sticking copper part is the stress point of rolling, and the damage at this stress point is more serious. The main reasons for the serious damage are: (1) The temperature rises rapidly during the copper alloy rolling process, and the hardness and strength of the copper alloy (2) The hardness of the mandrel material at high temperature is low; (3) The fatigue performance at high temperature is poor; (4) The heat dissipation efficiency of the mandrel is low

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