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

A centrifugal casting and ultra-thin-wall technology, which is applied to the centrifugal casting process of small-diameter ultra-thin-walled microalloy furnace tubes, can solve the problems of easy occurrence of pores, easy cracks and fractures, and difficult drying and discharge of paint gas. The effect of reducing the air volume and reducing the thickness

CN101927326AInactive Publication Date: 2010-12-29浦杰
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2010-12-29
Estimated Expiration
Not applicable · inactive patent

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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.
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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 ...

Examples

example 1

[0027] Example 1: Furnace tube specification: φ55×5×3200mm, material: ZG45Ni35Cr25NbTiZr, quantity: 500 pieces. The process used is as follows:

[0028]

[0029] Furnace tube appearance and size inspection: the surface of the furnace tube has no pores, slag inclusions, crack defects, and the size is qualified.

[0030] Inspection of mechanical properties of furnace tube at room temperature:

[0031]

[0032]

[0033] Furnace tube high temperature durability performance test:

[0034]

example 2

[0035] Example 2: Furnace tube specification: φ50×5×3100mm, material: ZG45Cr28Ni48W5, quantity: 610 pieces. The process used is as follows:

[0036]

[0037] Furnace tube appearance and size inspection: the surface of the furnace tube has no pores, slag inclusions, crack defects, and the size is qualified.

[0038] Inspection of mechanical properties of furnace tube at room temperature:

[0039]

[0040] Furnace tube high temperature durability performance test:

[0041]