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Method for preparing bimetallic seamless steel pipe for alkali recovery boiler

A technology for alkali recovery boilers and seamless composite steel pipes, which is applied in metal extrusion control equipment, metal processing equipment, metal extrusion and other directions, can solve the problems of two-layer metal delamination and other problems, and achieve the effect of satisfying the simultaneous deformation of the inner and outer layers.

Inactive Publication Date: 2011-05-04
BEIJING CHANGXING KAIDA COMPOSITE MATERIAL TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have a common feature, which is mechanical compounding, that is, there is no metallurgical bond between the two layers of metals that melts atoms. Therefore, the phenomenon of delamination of the two layers of metals will inevitably occur during use, causing serious consequences.

Method used

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  • Method for preparing bimetallic seamless steel pipe for alkali recovery boiler
  • Method for preparing bimetallic seamless steel pipe for alkali recovery boiler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 The preparation method of the double-metal seamless composite steel pipe for the alkali recovery boiler of the present invention comprises the following steps:

[0027] 1. Selection and processing of bimetallic tube blanks

[0028] 1. Billet selection: centrifugally cast 00Cr18Ni10 / 20G composite tube billet is selected. This kind of tube billet achieves preliminary metallurgical bonding and forms a large inner and outer layer bonding force. During the subsequent extrusion or extrusion + cold rolling production process, There will be no delamination or cracking due to the large shear force of the inner and outer metals.

[0029] 2. The first annealing: treatment at a temperature of 1050°C for 24 hours, the purpose is to reduce the thermal stress on the interface under the condition of a high-temperature boiler, the composition of the two-layer metal junction should have a wide gradient transition zone, and at the same time It is also to eliminate the uneven...

Embodiment 2

[0040] Example 2 The preparation method of bimetal seamless composite steel pipe for alkali recovery boiler is as follows:

[0041] 1. Selection and processing of bimetallic tube blanks

[0042] 1. Billet selection: choose centrifugal casting 00Cr18Ni10 / 20G composite tube billet.

[0043] 2. The first annealing: treatment at a temperature of 1000°C for 20 hours.

[0044] 2. Extrusion of bimetallic tube

[0045] 1. Extrusion: Use the extrusion ratio of 13 to break the grains.

[0046] 2. Billet heating system before extrusion: the billet before extrusion is heated at a temperature of 1180°C.

[0047] 3. The second annealing treatment: first heat preservation at 780°C for 2 hours, and then air cooling.

[0048] 3. Cold rolling

[0049] 1. Select an appropriate single-pass deformation amount to implement production, and the deformation amount is controlled within 40%;

[0050] 2. Reasonably distribute the deformation of each rolling pass through multi-pass rolling, so as to...

Embodiment 3

[0053] Example 3 The preparation method of bimetal seamless composite steel pipe for alkali recovery boiler is as follows:

[0054] 1. Selection and processing of bimetallic tube blanks

[0055] 1. Billet selection: choose centrifugal casting 00Cr18Ni10 / 20G composite tube billet.

[0056] 2. The first annealing: treatment at 1100°C for 30 hours.

[0057] 2. Extrusion of bimetallic tube

[0058] 1. Extrusion: Use the extrusion ratio of 17 to break the grains.

[0059] 2. Billet heating system before extrusion: the billet before extrusion is heated at a temperature of 1220°C.

[0060] 3. The second annealing treatment: first heat preservation at 800°C for 3 hours, and then air cooling.

[0061] 3. Cold rolling

[0062] 1. Select an appropriate single-pass deformation amount to implement production, and the deformation amount is controlled within the range of 55%;

[0063] 2. Reasonably distribute the deformation of each rolling pass through multi-pass rolling, so as to smo...

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Abstract

The invention relates to a method for preparing a bimetallic seamless steel pipe for an alkali recovery boiler. The method for preparing the bimetallic seamless steel pipe comprises the following steps of: selecting and treating a pipe blank, namely selecting a bimetallic composite pipe blank which is combined in a metallurgical mode and performing primary annealing; and extruding, namely extruding at an extrusion ratio of more than 10 and performing secondary annealing, wherein the heating temperature of the blank before extrusion is between 1,180 and 1,220 DEG C. The method has the characteristics that: an outer metal layer of the prepared composite pipe is resistant against alkali liquor corrosion, and an inner metal layer of the composite pipe is resistant against high pressure; meanwhile, the composite pipe avoids layering of two metal layers after tests such as flattening, bending and the like.

Description

technical field [0001] The invention relates to a bimetal composite pipe, in particular to a method for preparing a bimetal seamless steel pipe for an alkali recovery boiler. Background technique [0002] 00Cr18Ni10 / 20G bimetallic pipe is a necessary pipe material for alkali recovery boiler heat exchanger. The use conditions of the alkali recovery boiler heat exchanger have strict requirements on the quality of 00Cr18Ni10 / 20G bimetallic tubes, and at the same time put forward higher requirements for its production and manufacturing process routes. At present, there are many preparation methods for bimetallic composite pipes, mainly including explosive forming method, coil welding method, nested compaction method and so on. These methods have a common feature, which is mechanical compounding, that is, there is no metallurgical bond between the two layers of metals that melts atoms. Therefore, the phenomenon of delamination of the two layers of metals will inevitably occur du...

Claims

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Application Information

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IPC IPC(8): B21C23/01B21C31/00C22C38/58C22C38/40C22C38/04B21C37/06B21B37/58C21D9/08C21D11/00
CPCY02P10/20
Inventor 王黎晖鲍善勤黄晓斌刘焕统吴正筠郭明海杨玉学苏承龙解国良韩静涛李生国肖书兵王子健石军曹文新
Owner BEIJING CHANGXING KAIDA COMPOSITE MATERIAL TECH DEV
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