Do you know what testing items are there when the stainless steel seamless elbow leaves the factory?
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The detection items of stainless steel seamless elbow mainly include the following aspects:
1. Check the appearance: It is necessary to ensure that the surface of the stainless steel seamless elbow is smooth and free of scale, and there must be no obvious defects such as scarring, folding, and separation that exceed 5% of the wall thickness and the maximum depth is not greater than 0.8mm. Mechanical scratches with a nominal wall thickness of 12% and a maximum depth of no more than 1.6mm must be removed.
2. Check the size: the size of the stainless steel seamless elbow must meet the standard. It can be measured with a vernier caliper, checked with the corresponding standard inspection table, and the shape and size of the stainless steel seamless elbow are checked one by one. The shape tolerance does not exceed the national standard GB/ T12459-2005 stipulates that the wall thickness of stainless steel seamless elbows is not less than 87.5% of the nominal wall thickness.
3. Testing hardness: The hardness of the stainless steel seamless elbow must meet the corresponding national standards. If it is unqualified, it will not be shipped from the factory, and inspections should be doubled. If it is still unqualified, the heat treatment process must be performed again.
4. End bevel: Because stainless steel seamless elbows are mostly connected by welding, in order to improve the welding quality, the end face is turned into a bevel shape, leaving a certain angle, a certain edge, and the bevel angle of the edge must be within the specified tolerance range.
5. Supplementary inspection: Some special stainless steel seamless elbow fittings should also undergo some supplementary inspections, such as: low temperature toughness impact test, nondestructive testing of elbow fittings, magnetic particle inspection and some mechanical tests. The material of stainless steel seamless elbow must refer to the quality assurance certificate and test report provided by the supplier. If it is a special material, it must be sampled and tested.
6. Mark content: the content should include the manufacturer’s name, trademark, material grade, nominal size, wall thickness grade, product code and standard number, etc.
7. Marking position: As long as the specification permits, it is marked on the pipe fittings. The marking position should be near the centerline of the side of the pipe fittings, and it should be marked on a part that is easy to observe. The steel stamp should avoid the high stress area of the pipe fittings.
Stainless steel seamless elbows should be tested according to the above aspects before leaving the factory.