周家林, 黄高, 向上, et al. Structure and Mechanical Properties of Medium and Heavy Plate of Ti Microalloyed Q345D Steel[J]. Special Steel, 2014, 35(3): 49-52.
周家林, 黄高, 向上, et al. Structure and Mechanical Properties of Medium and Heavy Plate of Ti Microalloyed Q345D Steel[J]. Special Steel, 2014, 35(3): 49-52.DOI:
structure and precipitates of medium plate 30 mm X 2 500 mm of Ti micro alloyed Q345D steel (/%: 0. 15C
0.27Si
1. 36Mn
0. 019Ti
0. 011P
0. 003S
0. 026Als) produced by hot metal desulphurizing-150 t converter-RH-shielding casting-control rolling and cooling process have been studied. Results show that of Ti microalloying Q345D steel the tensile strength is m525 MPa
yield strength N390 MPa
elongation >29% and the -40 ℃. impact energy is 125 J; the structure of steel consists of pearlite
ferrite and minor sorbite with grain size grade 12~14; the main inclusions in steel are MnS and Ti
4
C
2
S
2
the precipitates in steel are dispersive-distributed 50 ~250 nm TiN; and the increment of strength of steel is mainly caused by fine-grain strengthening of TiN.