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A production process of nickel-based alloy tubes for high-pressure boilers

A nickel-based alloy and production process technology, which is applied in the field of nickel-based alloy tube production technology for high-pressure boilers, can solve the problems of high cost of hot extrusion equipment and strong cold spinning equipment, and is not suitable for small and medium-sized enterprises, and achieves excellent solid solution. effect, the production process is short, the effect of shortening the solution treatment time

Active Publication Date: 2016-06-08
CHANGZHOU SHENGTAK SEAMLESS STEEL TUBE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese invention patent [Application No.: 201010538461.6] discloses a method of centrifugal casting + hot extrusion + cold rolling or cold drawing to process small-diameter thin-walled nickel-based alloy pipes. This process also has hot extrusion equipment and strong cold spinning The cost of pressing equipment is relatively high, and it is not suitable for general small and medium-sized enterprises.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0027] The production process of nickel-based alloy tube for high-pressure boiler of the present invention includes the following steps:

[0028] (1) Use a horizontal centrifugal casting machine to cast nickel-based alloy tube blanks, the outer diameter of the tube blanks is 92mm, the wall thickness is 8mm; the centrifugal casting pouring speed is 20kg / s; the centrifugal casting is gradually increased within 15s when pouring starts Rotation speed of the mold barrel until the pouring is completed; after pouring, reduce the rotational speed of the mold barrel in the same law as during acceleration until the tube blank casting is completely solidified;

[0029] (2) Saw the blank tube to a length of 4600mm, and pickle the inner and outer walls of the blank tube; rinse with clean water after the pickling treatment, and dry it for use;

[0030] (3) Carry out the first cold rolling of the tube blank after the pickling treatment in step (2), the cold rolling deformation is 20-35%, the outer ...

Embodiment 2）

[0037] The production process of nickel-based alloy tube for high-pressure boiler of the present invention includes the following steps:

[0038] (1) Use a horizontal centrifugal casting machine to cast nickel-based alloy tube blanks, the outer diameter of the tube blank is 20mm, the wall thickness is 3mm; the centrifugal casting pouring speed is 25kg / s; the centrifugal casting is gradually increased within 15s when pouring starts Rotation speed of the mold barrel until the pouring is completed; after pouring, reduce the rotational speed of the mold barrel in the same law as during acceleration until the tube blank casting is completely solidified;

[0039] (2) Saw the blank tube to a length of 1550mm, and carry out pickling treatment on the inner and outer walls of the blank tube; rinse with clean water after the pickling treatment, and dry for later use;

[0040] (3) Carry out the first cold rolling of the tube blank after the pickling treatment in step (2), the cold rolling deform...

Embodiment 3）

[0047] The production process of nickel-based alloy tube for high-pressure boiler of the present invention includes the following steps:

[0048] (1) Use a horizontal centrifugal casting machine to cast nickel-based alloy tube blanks, the outer diameter of the tube blank is 150mm, the wall thickness is 28mm; the centrifugal casting casting speed is 30kg / s; the centrifugal casting is gradually increased within 15s when the casting starts Rotation speed of the mold barrel until the pouring is completed; after pouring, reduce the rotational speed of the mold barrel in the same law as during acceleration until the tube blank casting is completely solidified;

[0049] (2) Saw the tube blank to a length of 7180mm, and pickle the inner and outer walls of the tube blank; rinse with clean water after the acid wash, and dry it for later use;

[0050] (3) Carry out the first cold rolling of the tube blank after the pickling treatment in step (2), the cold rolling deformation is 20-35%, and the ...

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Abstract

The invention relates to a production technology of an alloy tube, in particular to a nickel base alloy tube producing technology for a high-pressure boiler. The nickel base alloy tube producing technology sequentially comprises the steps of centrifugal tube blank casting, tube blank cutting-off, first cold rolling, middle annealing, second cold rolling, finished product heat treatment, physical and chemical inspection, straightening, finishing, eddy current inspection (substituting water pressure tests), tube body detection, ultrasonic flaw detection, mark spraying, packaging, storing and the like. The nickel base alloy tube producing technology is short in production process and capable of greatly reducing the production cycle of the nickel base alloy tube, improving production efficiency and reducing production cost. Moreover, the tube blank is produced in a centrifugal casting mode, so that the material utilization rate is high, and material waste is avoided. The inner surface of the centrifugal casting tube blank is high in roughness degree. An acid washing method is used after centrifugal casting, so that the roughness degree of the inner surface of the centrifugal casting tube blank is reduced. Moreover, two times of deformation are both conducted through cold rolling, so that the hot extrusion process is eliminated, the further arrangement of hot extrusion equipment is eliminated, and production cost is reduced.

Description

Technical field [0001] The invention relates to an alloy tube production process, in particular to a nickel-based alloy tube production process for high-pressure boilers. Background technique [0002] Alloy pipes for high-pressure boilers, especially alloy pipes for ultra-supercritical high-pressure boilers, require materials with high high-temperature strength, creep fracture resistance and corrosion resistance. As an ideal high-temperature alloy material, nickel-based alloys have been extensively studied in recent years. Because nickel-based alloys have higher resistance to thermal deformation and poor thermoplasticity, the production of nickel-based alloy tubes is more difficult. [0003] A search of the prior art documents found that the Chinese invention patent [application number: 200410100466.5] discloses a forged rod hot piercing + cold working (cold rolling or cold drawing) process to process Incone1690 alloy pipes, because nickel-based alloys have higher heat Deformatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
CPCB21C37/06C22C19/055
Inventor 周文庆周益鑫范琪
Owner CHANGZHOU SHENGTAK SEAMLESS STEEL TUBE
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