316L pipe cap

One thing many people asked about 316L pipe cap during high temperature processing is that there is a vacancy in manganese steel. During heat treatment, if there is no time to remove this vacancy due to fast cooling water, it will be "determined" to be in the crystal. Most of the these vacancies in superfluous solid solutions are associated with the solute nuclei. The deep stamping die usually does not need production, production and processing. For those convex 316L pipe caps, the radius of curvature of the meridian is smooth and continuous, and the shear force is evenly distributed before and after. It seems that for the standard stainless steel pipe caps with a/b=2, the edge shear force is small, but it must be considered. Therefore, from the perspective of the support reaction, the elliptical type is far higher than the hemispherical type and the conical type, except for the production materials and granular materials, The materials used for production and the heat exchange of water, as well as the corrosivity of substances on both sides of the basic data of machinery and equipment, as well as the scale and erosion, such a disorderly environment of dedicated service skills can not be touched by all different machinery and equipment

Protection of 316L pipe cap surface

1.3After the assembly welding of 16L pipe cap and cylinder, the welding slag, spatter and pollutants in the weld, heat affected zone and around shall be cleaned in time, and PT inspection and surface pickling shall be carried out

2. Prevent the stainless steel pipe cap surface from collision and scratch

3. Prevent direct contact with carbon steel and iron ion pollution

4. It shall not be stored in the open air and protected from rain. Avoid forced assembly welding. The structural design shall prevent excessive restraint stress

5. The chloride ion content of water for hydrostatic test shall not exceed 25mg/L, and it shall be dried in time after the test

6. Reducing acids such as hydrochloric acid cannot be used for stainless steel pickling. Strictly comply with the medium compatibility specified in the Vessel Regulations

Note: the 316L pipe cap is easy to cause spot corrosion on the surface due to improper surface protection. When superposed with processing stress and welding stress, stress corrosion and intergranular corrosion will occur. Therefore, special attention should be paid to the surface protection of such stainless steel

Inspection of 316L pipe cap is important:

1. Inspection of 316L pipe cap raw materials. First of all, check the supporting documents on material quality. Whether the quality of materials is up to the standard or not

2. Inspection of pipe cap. ① The determination of appearance size shall meet the requirements of the ordering party, and the identification on the material surface shall be marked by spraying code, such as material standard, batch number, field number, material abbreviation, etc. ② The materials used need to be treated by solution annealing and pickling to protect their surfaces from obvious defects, such as cracks, scratches, delaminations, etc

3. Blanking of stainless steel plate of pipe cap. Stainless steel plate of pipe cap can be cut by plate shears, laser or plasma cutting, or by flame cutting

4. Stacking of materials. Different from the storage of other materials, stainless steel materials should be placed separately from carbon steel materials, and stored indoors according to the output specification, output batch and material classification of stainless steel

5.