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Steel pipe pressure bearing algorithm for black steel pipes

Date:2023-12-18
pressure bearing algorithm for black steel pipes
1: calculating the pressure capacity of seamless steel pipes based on the outer diameter, specifications, and wall thickness of seamless steel pipes (different materials of steel pipes have different tensile strengths)
pressure = (wall thickness * 2 * steel pipe material tensile strength) / (outer diameter * coefficient)

2: calculation method for wall thickness based on knowing the outer diameter and pressure of seamless steel pipes:
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 [2]

mechanical properties of black steel pipe
the mechanical properties of large-diameter steel pipes are important indicators to ensure the final performance (mechanical properties) of large-diameter steel pipes. it depends on the chemical composition and heat treatment system of the steel pipes. therefore, according to different usage requirements, the mechanical properties of large-diameter spiral steel pipes will be introduced in detail from the aspects of tensile strength, yield point, and elongation.

1. tensile strength
during the stretching process, the maximum force (fb) the sample endures when it breaks is the stress (σ) obtained by the original cross-sectional area (so) of the sample, which is called tensile strength (σb). the unit is n/mm2 (mpa). it represents the maximum ability of a metal material to resist damage under tension.

2. yield point
for metal materials with yield phenomenon, the stress at which the sample can continue to elongate without increasing (remaining constant) force during the stretching process is called the yield point. if the force decreases, the upper and lower yield points should be distinguished. the unit of yield point is n/mm2 (mpa).

3. elongation after break
in the tensile test, the percentage of the increased length of the gauge length of the specimen after it is broken to the original gauge length is called elongation. expressed by σ, the unit is %.