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Method for determining reheat cracking susceptibility

A technique for reheat cracking and susceptibility, which is used in the application of stable tension/pressure to test material strength, preparation of test samples, strength characteristics, etc., and can solve problems such as test no longer enough and reheat crack

Active Publication Date: 2014-05-07
NUOVO PIGNONE TECH SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] While these qualitative tests have in the past ensured the quality of the construction process, recent developments in Europe have shown that 2.25Cr 1Mo 0.25V reactors are facing reheat cracking problems and existing tests are no longer sufficient

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  • Method for determining reheat cracking susceptibility
  • Method for determining reheat cracking susceptibility
  • Method for determining reheat cracking susceptibility

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Embodiment Construction

[0033] The following description of the exemplary embodiments refers to the accompanying drawings. The same reference signs identify the same or similar elements in different drawings. The following detailed description does not limit the present invention. Instead, the scope of the invention is defined by the appended claims. For the sake of simplicity, the following examples discuss the terminology and structure of chemical reactors. However, the embodiments to be discussed below are not limited to this reactor, but other reactors or welding parts can be applied.

[0034] The "one embodiment" or "an embodiment" mentioned throughout the specification means that a specific feature, structure, or characteristic described in conjunction with one embodiment is included in at least one embodiment. Therefore, appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout the specification do not necessarily refer to the same embodiment. In additi...

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Abstract

System and method for determining a susceptibility of a sample (26) of material, which includes a welded area (20), to reheat cracking. The method includes measuring a length of the sample (26), applying a first stress to the sample (26) to achieve a predetermined elongation of the sample (26), exposing the elongated sample (26) to a predefined heat treatment, applying a second stress to the sample (26) until the sample breaks at least into two different pieces (30, 40), and determining the susceptibility of the broken sample (26) to reheat cracking.

Description

Technical field [0001] The present invention generally relates to systems and methods for determining the susceptibility to reheat cracks in materials, and more specifically, to mechanisms and techniques for determining the susceptibility to reheat cracks in materials. Background technique [0002] In the refining and petrochemical industries, various applications require the use of high temperature and high pressure inside the reactor to remove sulfur or achieve other desired chemical reactions. Therefore, the walls of the reactor must not only withstand the destructive characteristics of the chemicals inside the reactor, but also must withstand changing conditions, such as temperature, pressure, etc. Special materials are used to make the walls of the reactor, like stainless steel containing various alloys. [0003] In the past few years, conventional low-alloy chromium-molybdenum 2.25Cr-1Mo steel has been widely used in reactor vessels. The reactor usually operates at a temper...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/44G01N23/225
CPCG01N3/18G01N2203/0222G01N2203/0071G01N3/54G01N2203/006
Inventor L·托纳雷利E·焦尔尼M·罗马内利M·马内蒂
Owner NUOVO PIGNONE TECH SRL
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