Q450NQR1高强度耐候钢连铸板坯的高温性能

Elevated Temperature Performance of Casting Slab of High Strength Weather-Resisting Steel Q450NQR1

采用DIL402C热膨胀仪和Gleeble-1500D热模拟试验机,测试了Q450NQR1钢(%:0.05～0.10C、0.30～0.50Si、0.80～1.00Mn、0.20～0.30Cu、0.15～0.35Ni、0.40～0.60Cr)200 mm×1 350 mm铸坯的热膨胀性能和高温力学性能。结果表明,升-降温速率由5℃/min提高至10℃/min时,升温相变温度区间上移,降温相变区间下移;Q450NQR1钢连铸坯二次脆性区为750～1 050℃,铸坯的矫直温度应≥1 050℃。

Thermal expansion characteristics and elevated temperature mechanical properties of 200 mm × 1 350 mm casting slab of steel Q450NQR1 （ % ： 0. 05 - 0. 10C, 0. 30 - 0. 50Si, 0. 80 - 1.00Mn, 0. 20 - 0. 30Cu, 0. 15 - 0. 35Ni, 0. 40 -0. 60Cr） have been examined by using thermal expansion tester DIL402C and thermal simulater Gleeble-1500D. Results show that with increasing heating and cooling rate from 5 ℃/min to 10 ℃/min, the heating phase transformation region moves up and the cooling phase transformation region moves down; the secondary brittleness zone of casting slab of steel 0450NOR1 is 750 - 1 050 ℃ , therefore the straightening temperature of slab should be ≥ 1 050 ℃.