刘平, 姜丽, 李峰. Effect of Mn on Physical Properties of Concasting Bloom of Medium Carbon Steel at High Temperature[J]. Special Steel, 2011, 32(4): 64-66.DOI:
The longitudinal crack of 37Mn5 steel 280 mm x 380 mm concasting bloom produced by 120 t converter- LF-VD-bloom caster process often occurs in production. The hot plasticity and mechanical properties of 280 mm x 380 mm concasting bloom of 37Mn5 steel (% ; 0. 34 ~ 0. 38C t 1. 30 - 1. 55Mn) and 0. 45C steel (%: 0. 42 〜0. 50C
0. 50 〜 0. 80Mn) at 1 300 - 800 ℃ and their dilatometric-shrinking effect during heating and cooling between ambient and 1 300 °C have been tested and analyzed by using Gleeble 1500D thermal simulation machine. It is obtained that as compared with 0. 45C steel bloom
at W950 °C the hot plasticity of 37Mn5 steel bloom is lower and the change of volume at phase transformation range is larger than that of 0. 45C steel bloom led to occurrence of longitudinal crack. Therefore
heating and cooling speed of 37Mn5 steel bloom between 870 Y and 540 Y should be slowed down to avoid occurrence of longitudinal crack.