Development of Nano-Scale Precipitation Strengthened Hot-Rolled 590MPa Grade Wheel Steel

Xiao Nan Wang; Lin Xiu Du; Hong Shuang Di

doi:10.4028/www.scientific.net/MSF.762.152

Paper Titles

Recrystallization Behavior of 0.11% Ti-Added Complex Phase Steel during Hot Compression
p.128

Characterization and Modeling of Softening Kinetics during Hot Deformation in Modern Steels
p.134

Softening Kinetics in High Al-Nb Microalloyed Steels
p.140

Study of the Effect of Thermomechanical Processing on Grain Refinement in HSLA Steels
p.146

Development of Nano-Scale Precipitation Strengthened Hot-Rolled 590MPa Grade Wheel Steel
p.152

Microstructure and Mechanical Properties of X80 Induction Heating Bends
p.158

Effect of Reheat Conditions on Microstructure Evolution and Precipitation Behavior in High Strength Linepipe Steel
p.165

Effect of Different Cooling Paths on the Microstructure and Properties of a Plain Carbon Steel
p.171

Microstructural Evolution during Tempering of 16Cr-5Ni Stainless Steel: Effects on Final Mechanical Properties
p.176

HomeMaterials Science ForumMaterials Science Forum Vol. 762Development of Nano-Scale Precipitation...

Development of Nano-Scale Precipitation Strengthened Hot-Rolled 590MPa Grade Wheel Steel

Abstract:

In order to promote the production of lightweight automobiles and enhance the strength grade of the automobile wheel steel, a nanoscale precipitation strengthened hot-rolled 590MPa grade wheel steel was developed to replace the Q235 steel, which was originally use for the wheel. The new wheel steel type was based on a C-Mn steel composition, microalloyed with Nb, V and Ti, thus making full use of the strengthening from both grain refinement as well as nanoscale precipitation. The microstructure of the wheel steel was composed of fine-grained ferrite and pearlite and carbides distributed along the ferrite grain boundaries. The yield and tensile strengths of the strip were about 550 MPa and 620 MPa, respectively. The value of hole expansion rate was 90%. The strip has shown high low temperature impact toughness and cold formability. The strengthening mechanisms of the strip were mainly governed by grain refinement and nanoscale precipitation (Nb,V,Ti)C, and the amount of the contribution from precipitation strengthening alone was about 215 MPa. The finishing rolling start temperature was about 950°C and the finish rolling temperature was between 790~830°C. Coiling temperature of 650°C gave the best combination of mechanical properties.