How to test the hardness of oil casing

　　For oil casing made of tensile specimens, the tensile testing machine of the specimens will be pulled to the fracture. Another measurement, usually only the mechanical properties of tensile strength or more, yield strength, elongation and reduction of area will be measured. Tensile test is a test method for metallic materials. Almost all metallic materials, as long as the required mechanical properties, provide the basic mechanical properties for tensile test. Especially for those materials that are not easy to form, hardness test and tensile test are the only means to test mechanical properties.

　　The oil casing hardness test is a rigid indenter hardness tester that is pressed slowly into the surface of the specimen under the specified conditions, and then the indentation depth or size is tested to determine the hardness of the material. Oil casing hardness test is the simplest, quickest and easiest way to test the mechanical properties of materials. The non-destructive hardness test is similar in the relation between hardness and tensile strength. The hardness value of the API 5L X70 LSAW Seamless Steel Oil Casing can be converted into the tensile strength, which has great practical significance.

　　Because the tensile test is not easy to test, and the hardness strength of the conversion is very convenient, so more and more people only test their own strength with less hardness test. Especially due to the continuous progress and innovation of the hardness of manufacturing technology, some hardness that could not be directly tested before, such as oil casing, stainless steel plate and stainless steel belt, can now be directly tested. Therefore, there is a trend of gradually replacing hardness test tensile test.