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Double-phase stainless steel post-heat treatment system

A technology of duplex stainless steel and post-weld heat treatment, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of large influence on the performance of heat exchange tubes, unsuitable for duplex stainless steel 2205, etc. and the effect of easy control of heat preservation temperature and simple structure

Inactive Publication Date: 2017-03-08
黄鸣
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Compared with traditional pure ferritic or austenitic stainless steel, duplex stainless steel 2205 has obvious phase transformation during heat treatment, which has a great impact on the performance of heat exchange tubes welded with this material, such as occurring at about 450 ° C and The brittleness changes around 800°C, which makes traditional stainless steel post-weld heat treatment equipment not suitable for duplex stainless steel 2205

Method used

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  • Double-phase stainless steel post-heat treatment system

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Effect test

Embodiment 1

[0025] Such as figure 1 As shown, it is used for solution treatment of duplex stainless steel pipes after welding, including two sets of driving wheels 1 located on the same straight line, anti-oxidation pipe 11 between the two sets of driving wheels 1 and sleeved on the anti-oxidation pipe The cooling chamber 7 and the heating chamber 10 on the 11, the anti-oxidation pipe 11 is a tubular structure with a sealing ring 2 at both ends, the driving wheel set 1 includes two driving wheels, and the two driving wheels There is a gap for accommodating the stainless steel pipe between them, the gap is located on the axis of the anti-oxidation pipe 11, the anti-oxidation pipe 11 is also provided with an air outlet 3 and an air outlet, and the cooling chamber 7 and the heating chamber 10 are located at the air outlet 3 between the air outlet;

[0026] Described cooling chamber 7 is the water storage container that is provided with water inlet 8 and water outlet 5 on it, and described w...

Embodiment 2

[0032] The present embodiment is further limited on the basis of embodiment 1, as figure 1 As shown, in order to control the transmission speed of the duplex stainless steel pipe in the anti-oxidation pipe 11 and control the movement state of the duplex stainless steel pipe, the two sets of driving wheels 1 are located on the same horizontal plane.

[0033] In order to facilitate the uniformity of heating at each point of the duplex stainless steel pipe in the heating chamber 10 and to increase the heating speed, a heat transfer layer is also wound on the surface of the anti-oxidation pipe 11 located in the heating chamber 10, and the resistance heating wire is wound on the heat transfer layer. heat layer.

[0034] In order to facilitate the process parameter control of the heating chamber 10 and the cooling chamber 7, temperature sensors are arranged in the heating chamber 10 and the cooling chamber 7.

[0035] In order to facilitate the safety of the cooling chamber 7, a sa...

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Abstract

The invention discloses a double-phase stainless steel post-heat treatment system, which is used for performing solution treatment on a welded double-phase stainless steel pipe, and comprises two groups of driving wheel groups, an anti-oxidation pipe, a cooling chamber and a heating chamber, wherein the anti-oxidation pipe is a tubular structure with sealed rings arranged on both ends, each driving wheel group comprises two driving wheels, the anti-oxidation pipe is further provided with a gas inlet and a gas outlet, the cooling chamber is a water storage container provided with a water inlet and a water outlet, the heating chamber comprises a thermal insulation layer and a heating device wrapped in the thermal insulation layer, the heating device is a resistance heating wire, and a bidirectional thyristor controller is connected to the resistance heating wire. According to the present invention, the structure is simple, and the process of various steps of the double-phase stainless steel pipe solution treatment is conveniently achieved so as to achieve the rapid heating and the quenching during the solution treatment process within the short time.

Description

technical field [0001] The invention relates to the field of mechanical engineering heat treatment equipment, in particular to a duplex stainless steel post-weld heat treatment system. Background technique [0002] At present, the domestic 2205 stainless steel products include 2205 stainless steel pipes, 2205 duplex stainless steel seamless pipes; 2205 duplex stainless steel plates, 2205 stainless steel bars, forgings, pipe fittings, strips, etc. Early duplex stainless steels were resistant to moderate-strength uniform corrosion and chlorine stress corrosion cracking, but their performance was greatly reduced when used in welded situations. In order to improve this situation, nitrogen is added to duplex stainless steel 2205, which not only improves the corrosion resistance, but also improves the welding performance. Due to the special performance characteristics of 2205 dual-phase steel, it has a wide range of applications, and it is a grade that has been widely used so far...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/08C21D1/00
Inventor 黄鸣
Owner 黄鸣
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