Publish Time: 2022-02-18 Origin: Site
A seamless stainless steel pipe product needs to go through multiple inspection steps, from simple visual identification to precision instrumentation testing, and only if all inspection results are qualified, then it is a qualified pipe that can enter the SMLSCO warehouse.
Yes, let's talk briefly about tensile testing today.
┃What is tensile testing？
Tension is a simple mechanical property test. Within the test gauge, the stress is uniform, the measurement of stress-strain and its performance indexes is stable, reliable and convenient for theoretical calculation.
Through the tensile test, the most basic mechanical properties in the process of elastic deformation, plastic deformation and fracture of materials can be measured, such as positive elastic modulus E and yield strength σ 0.2. Yield point σ s. Tensile strength σ b. Elongation rate after fracture δ And reduction of area ψ Wait. Mechanical property indexes obtained in tensile test, such as e σ 0.2、 σ s、 σ b、 δ、ψ It is the inherent basic properties of materials and the main basis in engineering design.
Tensile test is the most common test in metal mechanical property test. The measurement results of the same material through different tensile test processes are not necessarily the same.
┃What factors are affecting the tensile test?
Sampling Position and Method
Due to the uneven distribution of composition, organization, mechanism, defects, processing deformation, etc. in the materials, there are differences in different parts of the same batch or even the same product. Therefore, when cutting samples, it shall be carried out in strict accordance with the provisions of the standard.
Test Equipment
The test equipment directly affects the accuracy and authenticity of the result data, so the test machine must be within the validity period of verification.
Impact of Test Environment
The test environment mainly includes the influence of ambient temperature and the selection of clamping apparatus.
Selection of Test Methods
The test methods mainly include the clamping method, tensile rate, tensile cross-sectional area and the measurement method of pattern size. When selecting the size of the measurement pattern, it is appropriate to select the outer diameter micrometer, vernier caliper or vernier caliper for rectangular sample.
In addition to the above factors, there are also errors caused by differences in subjective factors and operational skills. Therefore, the skills and knowledge of the inspectors are also very important.