In determining the type of SA515 Gr.70 asme carbon steel plate, stainless steel products to be selected, the main considerations are the required aesthetic standards, the corrosivity of the local atmosphere and the cleaning system to be adopted. For example, 304 stainless steel is widely used in curtain wall, side wall, roof and other building applications, but in the corrosive industrial or marine atmosphere, it is better to use 316 stainless steel.
Compared with the common pressure vessel, the pressure parts of the boiler not only bear the pressure, but also suffer from the radiation and erosion of the high temperature flue gas. Once the pressure components of the boiler fail in operation, it will cause extremely serious consequences. Therefore, the SA515 Gr.70 asme carbon steel plate, steel materials used to manufacture the pressure components of the boiler must have enough high strength, plasticity, toughness, fatigue resistance and corrosion resistance, as well as good high-temperature mechanical properties for high-temperature components.
The location weld of SA515 Gr.70 asme carbon steel plate, wear-resistant steel plate is only allowed to be welded on the base metal surface with the electric welding rod for welding the base metal; in the welding of the base course, the base weld shall be strictly prevented from melting to the transition layer or even the multiple layer weld of stainless steel, so as to prevent a small amount of high chromium and high nickel surfacing wear-resistant steel plate components diluted into the carbon steel weld to form martensite structure and harden.
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