Short technical notes on blade materials, heat treatment and the failures we see every week. Written for people who run the machines.
Nine out of ten blade problems are a wrong material choice made before the blade was ever ground. This is the same logic we use when a customer sends us a worn blade and asks why it died.
Read the noteTwo blades from the same steel bar can behave completely differently on your machine. The difference is usually the furnace, and it is invisible until the blade is on the line.
Read the noteCryogenic treatment is sold as magic and dismissed as a gimmick. It is neither. Here is the metallurgy, the real numbers, and the cases where we tell customers to save the money.
Read the noteChipped edges are the most common complaint we hear, and the blade itself is the cause less than half the time. Here is the diagnostic order we run through before we agree to remake anything.
Read the noteA 4-metre guillotine knife that is 0.1 mm out of straight does not cut 0.1 mm worse — it leaves a step, a burr and an unfinished sheet. Straightness is the cheapest spec to demand and the most expensive to fix late.
Read the noteCustomers apologise for not having a drawing. Stop apologising — a worn blade and a ruler are enough. Here is exactly what to send, in order of usefulness, and what happens to it on our side.
Read the noteOn a fish filleting line, the blade — not the machine — decides how many grams of sellable fillet each fish gives up. The same logic applies to pangasius, tilapia, catfish and any whitefish line.
Read the noteDeheading and peeling blades on a shrimp line fail for reasons that never appear on a steel datasheet. Manage these three and the blades simply last.
Read the noteThere is no best steel for shredder blades — only the right steel for what you actually feed. Tyres, mixed plastics and wood punish the edge in completely different ways.
Read the noteA chipped chipper knife is rarely a bad knife. It is usually the right knife meeting the wrong gap, the wrong angle, or a feedstream nobody checked.
Read the noteA granulator tells you its knives are going long before it stops cutting. Read the granule, the motor and the sound — in that order.
Read the noteBelow zero, tool steel changes personality: it gets harder to break and easier to chip. Plants that run through hard winters adjust both handling and storage.
Read the note