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Connecting structure and connecting method of chrome-molybdenum steel and low-carbon steel for pressure vessel

A technology of pressure vessel and connection structure, which is applied in the field of dissimilar steel connection for pressure vessels, and can solve problems such as strength damage

Pending Publication Date: 2021-05-14
PETROCHINA CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The main purpose of the present invention is to provide a connection structure and connection method between chromium-molybdenum steel and low-carbon steel for pressure vessels, so as to solve the problem that the connection of dissimilar steels in the prior art is easy to cause strength damage

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  • Connecting structure and connecting method of chrome-molybdenum steel and low-carbon steel for pressure vessel
  • Connecting structure and connecting method of chrome-molybdenum steel and low-carbon steel for pressure vessel
  • Connecting structure and connecting method of chrome-molybdenum steel and low-carbon steel for pressure vessel

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Embodiment Construction

[0021] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0022] As recorded in the background technology, when 12Cr2Mo1R high-strength chrome-molybdenum steel is used on one side and low-carbon steel is used on the other side, the welding of ultra-thick circumferential welded joints with chrome-molybdenum steel on one side and Q345R on the other side occurs The structural form and the choice of welding method will directly affect the quality of the product. The choice of welding groove and welding process are the key steps of this welding. Due to the different base metals on both sides, the required heat treatment system has a large deviation. When manufacturing threaded locking ring heat exchangers: 12Cr2Mo1R material and its welded parts need to be...

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Abstract

The invention provides a connecting structure and connecting method of chrome-molybdenum steel and low-carbon steel for a pressure vessel. The connecting structure of the chrome-molybdenum steel and the low-carbon steel for the pressure vessel comprises an inner welding ring and an outer welding ring. The inner welding ring is detachably connected to the inner wall of a first to-be-connected steel cylinder. The outer welding ring is detachably connected to the outer wall of the first to-be-connected steel cylinder, and a welding cavity is formed between the inner welding ring and the outer welding ring so that welding flux can be subjected to surfacing welding. Surfacing welding is carried out in the welding cavity, a surfacing welding ring is formed, a second to-be-connected steel cylinder is in butt joint with the surfacing welding ring, welding is carried out, segmented welding of the first to-be-connected steel cylinder and the second to-be-connected steel cylinder is achieved, different kinds of heat treatment can be carried out on the first to-be-connected steel cylinder and the second to-be-connected steel cylinder, and therefore the connecting strength of the first to-be-connected steel cylinder and the second to-be-connected steel cylinder is guaranteed, and the strength of one of the to-be-connected steel cylinders cannot be damaged.

Description

technical field [0001] The invention relates to the technical field of connecting dissimilar steels for pressure vessels, in particular to a connection structure and method for connecting chromium-molybdenum steel and low-carbon steel for pressure vessels. Background technique [0002] With the new construction and expansion of 10 million tons of oil refining projects, hydrocracking, and hydrofining units, the size of the pressure vessels and pressure pipes involved will increase accordingly, resulting in a large amount of Cr-Mo (chromium-molybdenum) high-strength The application range of heat-resistant steel is increasing. In a piece of equipment, especially for cold-change pressure vessels, the materials used for the tube side and shell side are often different due to the difference in design temperature, design pressure, and operating medium. When the temperature and pressure of the two passes are quite different, the materials used will also be different. When 12Cr2Mo1...

Claims

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Application Information

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IPC IPC(8): B23K33/00B23K31/02B23K37/00
CPCB23K33/00B23K31/02B23K37/00
Inventor 邢芳秦国民蔡立春张国松李晓丹宗义山郭柏言刘岩张振亮刘斌韩永强杨波张军谭立峰
Owner PETROCHINA CO LTD
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