范秋梅, 付朝波, 张永恒, et al. Effect of Heat Treatment Process on Structure and Mechanical Properties of Steel Q345D for Rudder Stock[J]. Special Steel, 2011, 32(1): 61-63.
范秋梅, 付朝波, 张永恒, et al. Effect of Heat Treatment Process on Structure and Mechanical Properties of Steel Q345D for Rudder Stock[J]. Special Steel, 2011, 32(1): 61-63.DOI:
The structure and properties of Φ280 mm forgings of steel Q345D (%: 0. 18C
0.41Si
1. 34Mn
0. 05Nb
0. 08V
0. 024Al) after quenching + tempering treatment and nominalizing treatment have been tested and studied. Results show that with 890 ℃. air cooling for 200 s
then water cooling + 570℃ tempering the steel tensile strength Rm is ≥630 MPa
yield strength R
e
is ≥455 MPa and impact energy A
KV
at -20℃ is 28 ~40 J; with normalizing at 910 °C air cooling
the R
m
R
e
and -20 °C AKV of steel are respectively ≥575 MPa;≥390 MPa and 42 ~59 J
all the mechanical properties meet the requirement for rudder stock product ; the structure at depth 30 mm from surface of quenched-tempered rudder stock piece is tempered sorbite + granular bainite
at center it is pearlite + mino
r granular bainite
and all the structure at surface and center of normalized rudder stock piece is pearlite + ferrite.