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.