Flattening test of seamless steel pipes

Seamless steel pipes are more tedious and more rigorous in the production process. Seamless steel pipes is a relatively important type of steel pipe. It is necessary to carry out repeated experiments in production, but also to carry out development and production, so that the performance and use of the pipe meet the usage habits of seamless steel pipes and maximize its use of its various applications make use of engineering and machining. Seamless steel pipes during the development and production is to conduct some tests, here is mainly to explain the flattening test, is the seamless steel pipe plant physics and chemistry studio when the seamless steel pipe research a more important test. What are the common methods and steps for conducting tests?

Flattening test is to test the ultimate plastic deformation ability of seamless steel pipes under the given conditions and crush deformation without crack defects. The principle is to apply the length of the seamless steel pipe to the specified length of the end of the sample or seamless steel pipes. The force is pressed until the distance between the two platens under the action of force reaches the value specified by the relevant product standard.

First, flattening sample
1. The sample is cut from any part of the seamless steel pipe that has passed the visual inspection. The sample shall be the full-loaded pipe section of the pipe product.
2, The length of the sample should not be less than 10mm, but not more than 100mm. The edge of the specimen is allowed to be rounded or chamfered with yttrium or other methods. Note: If the test results meet the test requirements, you can not round or chamfer the edge of the sample.
3. If the test is to be carried out on the pipe end of a full-length pipe, cut perpendicular to the longitudinal axis of the pipe at the length of the sample from the end face of the pipe. The cutting depth shall be at least 80% of the outside diameter.

Second, test equipment
The test can be performed on a universal testing machine or a pressure testing machine. The test machine shall be equipped with two parallel upper and lower platens. The width of the parallel platen shall exceed the width of the flattened sample, ie at least 1.6D. The length of the platen is not less than the length of the sample. The tester has the ability to flatten the sample to the specified platen distance. The platen should have sufficient rigidity. And can control the speed range required by the test.