High-pressure heaters, as an important auxiliary machine to improve thermal economy, are an important part of a million-level secondary reheat unit. With the continuous deepening of the supply-side reform and the development of high-end power equipment for higher parameters, the serpentine tube heaters will become the mainstream of future development. The pipe bend wall thickness designed by GBT 151 is higher than that of foreign products, and there is a certain gap in economic and energy efficiency compared with foreign products. Through the finite element analysis, it is found that the serpentine tube could be designed according to the EN 12952-3 standard under the premise that the bending process meets the thickness of the inner and outer walls.
The high temperature creep rupture behavior of SA387Gr91 martensitic heat-resistant steel welded joint was studied in this paper. Accelerated creep tests were carried out at 545°C and 565°C and stresses ranging from 175 to 225Mpa. The creep test curves of SA387Gr91 martensitic heat-resistant steel welded joint were obtained. Microstructures of SA387Gr91 martensitic heat-resistant steel welded joint after creep and fractographs were analyzed by scanning electron microscope and optical microscope. From the macroscopic fracture morphology of the specimen after creep test, it can be seen that the fracture position is in the heat affected zone. The values of reduction in area range from 82.12% to 87.57%.
The failure causes of a burst convection tube used in heat recovery steam generator were analyzed by the chemical composition, optical microscope and scanning electron microscope analysis. The results show that the metallographic microstructure of the burst convection tube is ferrite and pearlite. Based on the scanning electron microscopy analysis, the thinning of the burst convection tube wall is caused by erosion. Ultimately, the convection tube bursts due to insufficient strength.
With the change of energy consumption structure, cryogenic liquids are increasingly widely used, such as liquefied natural gas (LNG), liquid hydrogen, liquid nitrogen, etc. Austenitic stainless steel is widely used in construction of cryogenic temperature pressure vessels as a kind of material with good cryogenic temperature resistance. It is difficult to give full play to the high tensile strength and high plasticity reserve of austenitic stainless steel by using conventional design methods, which results in material waste and cost increase. The strain strengthening technology of austenitic stainless steel is the more effective method to realize the lightweight design and manufacture of cryogenic pressure vessel and reduce the cost. In this paper, experimental study on mechanical properties of S30408 with strain-strengthening were carried out.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.