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Clad tube blank of dual metal seamless steel tube used for boiler and manufacturing method thereof

A technology of seamless steel pipe and production method, which is applied in the direction of metal layered products, chemical instruments and methods, pipes/pipe joints/pipe fittings, etc., to achieve the effect of improving service life and not easy to delaminate

Inactive Publication Date: 2009-09-16
XINXING DUCTILE IRON PIPES CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned bimetallic pipes, and provide a bimetallic seamless steel pipe for boilers that has a transition layer, the transition layer is completely metallurgically fused with the inner and outer layers respectively, is not easy to delaminate, and has a long service life. Composite tube blank and production method thereof

Method used

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  • Clad tube blank of dual metal seamless steel tube used for boiler and manufacturing method thereof
  • Clad tube blank of dual metal seamless steel tube used for boiler and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Put 410 kg of molten metal in the outer layer into the tube mold for centrifugal casting, the pouring temperature is 1576°C, cool the tube mold after pouring, and start pouring the transitional layer of molten metal when the inner surface temperature of the outer layer cools down to about 1250°C;

[0034] (2) Put 110 kg of the transition layer molten metal into the pipe mold and pour it centrifugally, the pouring temperature is 1642°C, cool down after pouring, and start pouring the inner layer of metal liquid when the temperature of the inner surface of the transition layer cools down to about 1500°C;

[0035] (3) Pass 445 kg of inner metal liquid into the pipe mold and pour centrifugally at a pouring temperature of 1642°C. After pouring, cool the pipe mold, and stop cooling after the outer layer, transition layer, and inner layer are all solidified. At this time, the transition layer has Complete metallurgical fusion with the inner and outer layers, respectively.

...

Embodiment 2

[0039] (1) Put 395 kg of molten metal in the outer layer into the tube mold for centrifugal casting, the pouring temperature is 1565°C, cool the tube mold after pouring, and start pouring the transition layer of molten metal when the inner surface temperature of the outer layer is cooled to about 1300°C;

[0040] (2) Pass 115 kg of the transition layer molten metal into the pipe mold for centrifugal casting, the pouring temperature is 1610°C, cool down after pouring, and start pouring the inner layer of metal liquid when the temperature of the inner surface of the transition layer cools down to about 1510°C;

[0041] (3) Pass 450 kg of inner metal liquid into the pipe mold and pour centrifugally at a pouring temperature of 1610°C. Cool the pipe mold after pouring, and stop cooling after the outer layer, transition layer, and inner layer are all solidified. At this time, the transition layer has Complete metallurgical fusion with the inner and outer layers, respectively.

[004...

Embodiment 3

[0045] (1) Put 405 kg of molten metal in the outer layer into the pipe mold for centrifugal casting, the pouring temperature is 1572°C, cool the pipe mold after pouring, and start pouring the molten metal of the transition layer when the inner surface temperature of the outer layer cools down to about 1285°C;

[0046] (2) Pass 120 kg of the transition layer molten metal into the tube mold for centrifugal casting, the pouring temperature is 1628°C, cool down after pouring, and start pouring the inner layer of molten metal when the temperature of the inner surface of the transition layer cools down to about 1503°C;

[0047] (3) Pass 445 kg of inner metal liquid into the pipe mold and pour centrifugally at a pouring temperature of 1628°C. After pouring, cool the pipe mold, and stop cooling after the outer layer, transition layer, and inner layer are all solidified. At this time, the transition layer has Complete metallurgical fusion with the inner and outer layers, respectively. ...

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Abstract

A clad tube blank of a dual metal seamless steel tube used for a boiler comprises an inner layer and an outer layer; a transition layer is arranged between the inner layer and the outer layer and is respectively bonded with the inner layer and the outer layer completely and metallurgically; the inner layer is cast by a Gr.A-1 material; the transition layer is cast by ferrite or inner layer materials. The transition layer is arranged between the inner layer and the outer layer of the clad tube blank and is respectively bonded with the inner layer and the outer layer completely and metallurgically, therefore, interfacial stress between joint surfaces of the inner layer and the outer layer is reduced, the tube blank is not easy to be layered and the service life of production tubes used for boilers and manufactured by the tube blank is greatly increased.

Description

technical field [0001] The invention relates to a bimetal composite material, in particular to a composite tube blank of a bimetal seamless steel pipe for a boiler and a production method thereof. The tube blank is processed into a bimetal seamless steel pipe for a boiler by extrusion or rolling. Background technique [0002] TP304L / Gr.A-1 bimetallic tube is the necessary piping material for black liquor boiler heat exchanger. Its composition standard requirements are shown in Table 1. See Table 2 for the performance requirements of the inner layer. [0003] Table 1 Material composition requirements for inner and outer layers [0004] [0005] Table 2 Performance requirements for inner layer materials [0006] Yield strength MPa Tensile strength MPa Elongation% ≥255 ≥415 ≥30 [0007] The service conditions of the black liquor boiler heat exchanger have very strict requirements on the quality of TP304L / Gr.A-1 bimetallic tubes, and at the same tim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D19/16B22D13/00B32B15/01F16L9/02C22C38/58C22C38/54
Inventor 王黎晖武贤陈建波陈睿杨玉学张伏霞刘静霍川喜
Owner XINXING DUCTILE IRON PIPES CO LTD
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