Notes of stainless steel head in pickling

Notes of stainless steel head in pickling  

Stainless steel head pickling notes: stainless steel pickling can not use equal reduction acid.  Strictly comply with the prescribed media compatibility.  For 304 stainless steel head is easy to cause surface corrosion due to improper surface protection.  Pay attention to surface protection.  Carbon steel head for the use of attention.  Carbon steel head cracks in salt, ammonia, alkaline sodium and other environment, please specify the use and material of the head when ordering.  

The stainless steel head produced by our company will have stress corrosion crack in the special environment with chloride ion, please choose the appropriate material in the design process.  Large stainless steel head so the stress intensity can be controlled, but due to the order of different wall thickness, may exceed the distribution range of edge effect, for the sake of smooth use, take the appropriate strength control within.  For large ports, in any case the thickness of the strengthening section shall not be less than the thickness of the conical shell of the connected small diameter head, the length of the strengthening section shall not be less than, and the length of the cylinder strengthening section shall not be less than.  In any case, the thickness of the reinforcing section of the small end shall not be less than the thickness of the connection, the length of the reinforcing section of the conical shell shall not be less than, and the length of the reinforcing section of the cylinder shall not be less than.  Compared with the oval head, the stress distribution is not as uniform, but the machining is easier, so it is not ideal in engineering use.  But when the mold processing of oval head is difficult, disc head is used instead.  For the medium pressure vessel composed of head and barrel, due to the discontinuous structure between head and barrel, this part becomes one of its high stress areas. Stress analysis is an indispensable content to ensure the operation of pressure vessel.  

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