Centrifugal casting process for minor-caliber ultra-thin-wall microalloy furnace tube

Abstract

The invention discloses a centrifugal casting process for a minor-caliber ultra-thin-wall microalloy furnace tube. The tapping temperature and the casting temperature of the casting molten steel, the temperature of a mould cylinder and the like are strictly controlled, so that the cast minor-caliber ultra-thin-wall microalloy furnace tube meets the design requirements and increases the yield thereof greatly. The centrifugal casting process can further reduce the wall thickness and the tube diameter of the furnace tube and reduce the manufacturing cost of the furnace tube, wherein the minimum wall thickness is 5 mm and the minimum tube diameter is 50 mm. The outer surface of the mould cylinder is divided into three segments for carrying out temperature control, so that on one hand, the drying speed of the coating is increased, the exhaust amount of the coating is reduced and the exhaust speed of the coating in the mould cylinder can be increased, and on the other hand, the temperature difference between the cast segment and the tail segment of the mould cylinder is reduced, thus the stress and deformation of the furnace tube during the casting cooling are reduced.

Description

technical field [0001] The invention relates to a centrifugal casting process of an alloy furnace tube, in particular to a centrifugal casting process of a small-diameter ultra-thin-walled micro-alloy furnace tube used in a petrochemical hydrogen production conversion furnace and an ethylene cracking furnace. Background technique [0002] With the development of the world economy, the earth's temperature is warming and abnormal, all countries in the world attach great importance to environmental protection, energy saving and emission reduction is the direction of the world's future economic development. Our country has also put forward the strategic thinking of sustainable development. Environmental protection, energy conservation and emission reduction, and development of low-carbon economy are the only way for my country's sustainable economic development. [0003] my country's petrochemical industry needs products such as synthetic ammonia, urea, and chemical fertilizers ...

AI Technical Summary

Problems solved by technology

[0006] 1) Due to the small amount of smelting molten steel of the small-caliber ultra-thin-wall centrifugal casting furnace tube, which is only about 50kg, its heat capacity is small, and it is not easy to dry and discharge the coating gas in the mold tube, so pores are prone to appear at the tail end

[0007] 2) Due to the small-caliber ultra-thin-wall centrifugal casting furnace tube, the amount of molten steel for smelting is only about 50kg, and the cooling speed after centrifugal casting is too fast, so the stress caused by the cooling is very large, and cracks and fractures are prone to occur

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