To simulate compact strip production (CSP) technology

the effect of Nb-Ti on structure and mechanical properties of 400 MP and 460 MPa high strength weathering steel-0.060～0.076C

0.25～0.31Cu

0.45～0.56Cr 0.29~0.30Ni has been studied by 10 kg vacuum induction furnace melting and rolled into 6 mm plate. The results showed that yield strength o

and tensile strength oi

of steel contained 0.03% Ti were respectively 450 MPa and 545 MPa

o

snd og of steel contained 0.03%Nb-0.02% Ti were 550 MPa and 615 MPa

and c

and on of steel no-contained Nb and Ti were only 375 MPa and 480 MPa.The structure of 400 MPa weathering steels were ferrite + minor pearlite

and the main precipitates of steel contained Ti were CuS₂(20~25 nm)and TiN (80 nm);the structure of 460 MPa steel contained Nb-Ti was mainly granular bainite with precipitates CuS2 and(NbTi)CN(30~60 nm)therefore the strength of steel increased.