Tensile Strength of Ferritic Steel P92 by Small Punch Test Technology

The measurement method of tensile strength of ferritic steel P92 by small punch test (SPT) technology was investigated. The load-displacement curves with different temperatures and thicknesses were obtained by SPT technology. The results show that the values of yield load P_y and maximum load P_max increase linearly as the thickness t increases. And the coefficient α in the σ_y＝αP_y/t² between yield load P_y of SPT and standard yield strength σ_y changes linearly with temperature T as α＝9.421 3×10^-4T+0.349 4. The α value of room temperature is 0.382.