Abstract: The analysis method of main steam pipeline of P91 hot pressing elbow of a 600 MW supercritical unit strength analysis using finite element simulation,got a 90 degree bend structure under internal pressure stress distribution,and on the basis of the simulation results select the measuring position,the resistance strain measurement technique on the stress distribution of the elbow the test,the test results and the simulation results is better,finally using the finite element simulation results of the bend strength was checked.

Key words: hot pressing elbow, P91, stress test, main steam line, simulation analysis