Fig. 7

(a) Universal tensile testing machine experimental procedure (b) SEM test diagram of Q235 fracture (c) SEM test diagram of Q355 fracture (d) relationship between strength of Q235 sample and ferritic phase fraction (e) relationship between strength of Q235 sample and inductive reactance (f) relationship between strength of Q355 sample and ferritic phase fraction (g) relationship between strength of Q355 sample and inductive reactance.