王庆敏, 刘应心. Effect of Relaxation Time after Finishing Rolling on YS-UTS Ratio of Q345GJC Steel Plate for High-Rise Building[J]. Special Steel, 2009, 30(3): 66-68.
王庆敏, 刘应心. Effect of Relaxation Time after Finishing Rolling on YS-UTS Ratio of Q345GJC Steel Plate for High-Rise Building[J]. Special Steel, 2009, 30(3): 66-68.DOI:
Effect of relaxing for 30 - 60 s after finishing rolling at 850 Y before cooling in air flow on yield strength- ultimate tensile strength (YS-UTS) ratio of 12 nini plate of Nh microalloving steel Q345GJC (% : 0. 16C
1. 37Mn
0.026Nb) has been studied. Results showed that with increasing relaxation time the grain size and content of ferrite increased and laniellar of pearlite colony thickened to decrease YS-UTS ratio. The YS-LTS ratio of test steel with relaxing for 30 s decreased to 0. 737 from 0. 765 of original un-relaxing steel
and that with relaxing for 60 s decreased to 0. 718.