The definition of the yield strength, tensile strength, elongation, reduction of area and other mechanical properties of steel bars, steel pipes, steel plates and other steel products and steel products:
1. Detection of the yield strength of steel
The stress when changing from an elastic deformation point to a plastic deformation is called the yield strength, which also becomes the yield point. It is divided into upper yield strength and lower yield strength. The symbols are ReH and ReI, and the unit is N/mm2 or MPa
Elastic deformation: The sample is elongated under the tensile force of the tensile machine. At the beginning, the extension of the sample is proportional to the tensile force. When the tensile force is released, the sample still returns to its original size. This deformation is called elastic deformation.
Plastic deformation: The specimen continues to deform and elong with increasing tensile force, but after the external force is released, the specimen does not return to its original length and becomes an irreversible permanent deformation. This deformation is called plastic deformation.
2. Testing of the tensile strength of steel
After the plastic deformation of the sample in the above-mentioned tensile test, the tensile force continues to increase, and the sample is finally broken. The stress at this time is the tensile strength, and its representative symbol is Rm, and the unit is N/mm2 or MPa.
3. Detection of elongation of steel
After the metal sample is stretched and broken, the ratio of the length of the stretched part to the original gauge length is the elongation. The symbol for the elongation after fracture is A, and the unit is %.
4. The reduction of area of steel
The percentage reduction of the cross-sectional area of the fracture when the metal sample is stretched and broken. Its representative symbol is Z and the unit is %.
To test the mechanical properties of steel bars, steel pipes, steel plates and other steel products and steel products such as yield strength, tensile strength, elongation, reduction of area and other mechanical properties, generally only a electronic universal testing machine or hydraulic universal testing machine is required, with appropriate attachments and accessories, everything can be tested.
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