Abstract: As the quenched crawler belt manufactured by steel 40SiMn2, 35MnTiB and 30MnTiB ( C≥030% ) easily occurs micro-cracks that doesn' t meet the requirement of anti-fracture behavior, while the hardenability HRC J_1.5 42. 5 〜 49. 0 and J_13.0 17. 5 ~ 37. 0 of produced steel 23MnB (/% : 0.20 - 0. 27C, 0. 80 〜1. 10Mn, ≤0. 20Cr, 0：0005 〜 0. 003 0B) can't meet the requirement of hardenability HRC J_1.5 44 ~ 55 and J_13.0 ≥35 for 228 pitch crawler belt, by 150 kg medium induction furance test and 120t BOF-LF-RH-CC-rolling pilot commercial production it is obtained that as adjusted composition of steel is (/% ) 0. 24 ~0. 30C, 1. 10 ~ 1. 50Mn, 0. 20 ~ 0. 50Cr, 0. 000 5 ~0. 003 0B, the steel hardenability HRC J_1.5 =48. 0 ~ 50. 0, J_13.0 =42. 5 〜46. 5, it meets the requirements of hardenability and anti-fracture behavior for 228 pitch crawler belt.

摘要： 针对碳含量≥0.30%的40SiMn2、35MnTiB和30MnTiB制造的履带板淬火后易出现细小裂纹,不能满足履带板抗断裂性要求。而生产的23MnB钢(/%:0.20～0.27C、0.80～1.10Mn、≤0.20Cr、0.000 5～0.003 0B)的淬透性HRC J_1.542.5～49.0,J_13.0 17.5～37.0达不到228节距HRC J1.544～55和J13.0≥35的要求,通过150 kg中频感应炉试验和120 t BOF-LF-RH-CC-轧制的工艺试验得出,当钢的成分调整为(/%):0.24～0.30C、1.10～1.50Mn、0.20～0.50Cr、0.000 5～0.003 0B时,钢的淬透性HRC J_1.5=48.0～50.0,J_13.0=42.5～46.5可满足228节距履带板的淬透性和抗断裂性要求。

关键词: C , Mn, Cr, 中碳MnB钢, 履带板, 淬透性