External factors affecting the compressive strength of seamless pipes

A seamless pipe is a long steel pipe with a hollow section and no seams around it. The strength of the seamless steel pipe refers to the limit of the seamless steel pipe when it is in a state, that is, the stress that resists microscopic plastic deformation. Forces exceeding this limit will permanently invalidate the part beyond repair.

External factors affecting the compressive strength of seamless steel pipes include temperature, strain rate, and ground stress.

1) As the temperature decreases and the strain rate increases, the compressive strength of the seamless pipe increases, especially where the body-centered cubic meter metal material is sensitive to temperature and strain rate, which is likely to cause ultra-low temperature embrittlement of steel ;

2) The impact of ground stress is also critical. Although the strength is an essential index that reflects the intrinsic properties of the material, the stress value is different and the strength value is also different.

Intrinsic factors affecting the compressive strength of seamless steel pipes are: fusion bond, mechanism, structure, and molecular nature. For example, comparing the compressive strength of metal materials with porcelain and fiber materials, it can be seen that the harm of fusion bonds is global.

The formula for calculating the compressive strength of seamless pipes:

1) Knowing the outer diameter, specification and wall thickness of the seamless steel pipe to find the calculation method to withstand the pressure (the tensile strength of different materials of the steel pipe is different)

Pressure = (wall thickness * 2 * tensile strength of steel pipe material) / (outer diameter * coefficient)

2) Knowing the outer diameter of the seamless steel pipe and the bearing pressure to find the calculation method of the wall thickness

Wall thickness = (pressure * outer diameter * coefficient) / (2 * tensile strength of steel pipe material)

3) Expression method of steel pipe pressure coefficient:

Pressure P<7Mpa, coefficient S=8; 7<steel pipe pressure P<17.5, coefficient S=6; pressure P>17.5, coefficient S=4

The deviation of seamless pipe sizes will also have a certain impact on the compressive strength.

Article source: https://article-realm.com/article/Finance/39230-External-factors-affecting-the-compressive-strength-of-seamless-pipes.html