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Acceptance rules and test methods during steel pipe inspection

浏览: Release time: 2019-11-04 10:18 Times

Steel pipes shall be inspected and tested according to the lot number. Each batch of steel pipes shall consist of steel pipes of the same specification, the same steel number, the same furnace number, and the same heat treatment time (such as heat treatment).
The number of steel pipes in each batch is specified as follows:
400 pieces with an outer diameter of <76 mm and a wall thickness of <3 mm
Outer diameter> 3516 meters 50
200 tubes of other sizes
If the number of remaining roots of a certain batch of steel pipes is less than 50% of the above requirements, it can be merged into adjacent batches of the same specification and the same steel number; if it exceeds 50% of the above specifications, it is classified as a batch separately. If the requesting party has not made any special requirements in advance, carbon-steel steel pipes can be formed into a batch of steel pipes of the same steel number that are not directed to the furnace tank.
The size of the steel pipe should be measured one by one.
The surface quality of steel pipes is generally checked with the naked eye.
Generally, the sampling test shall be in accordance with the provisions in Table 10-1.
If one of the test results of the steel pipe fails, another double number of samples shall be taken for the re-test of the unqualified item. If the re-test results include even one sample, the batch of steel pipes will not be accepted. However, it can be heat treated, submitted for acceptance in a new batch or reclassified, and submitted for acceptance one by one.