Clarke 14TPI Bandsaw Blades Pk2 for CBS45MD & SIP 07588 D5

i use my bandsaw for steel only. changed the blade over from the one fitted when i purchased the saw (second hand). at first the cuts were incredible in comparison but after only around 20 minutes of cutting use the blade is becoming blunt and keeps jumping off the wheels. luckily you get 2 in the pack but still i expect the blade to last way longer than it has!