This guide is for supervisors, maintenance teams and buyers whose blades come off with blue or burnt teeth, or heat marks on the cut end. Colour is a sign of heat, not of a cause. Here are the checks to make before you order another blade, and what to send us.
Look at the marks first
Write down what you see before you change anything. Note the colour of the teeth, the colour of the cut end, and any burr or rough surface. Note whether the colour is on every tooth or only some.
Take photos of the blade and of a cut piece. Mark which side of the blade the colour is on. A photo helps us more than the words "burnt blade".
Do not treat one burnt blade as proof of a bad blade. The same marks can come from the material, the blade line or the machine. The checks below take each one in turn.
Check the material against the blade ratings
Every Kinkelder blade page lists rating rows. Compare the row for your material with the blade you used. Our KINS' RED line is listed for solid steel bars and other dense metals, in versions for different tensile ranges and for stainless.
Take two examples from our KINS' RED line. HT is rated Medium Tensile 4 and High Tensile 8. Stainless Small is rated Austenitic Stainless 8 and Non-Austenitic Stainless 8. The rows differ from blade to blade, so the blade name alone does not tell you the material range.
If your material scores low on the blade you used, raise it with us. Tell us the material grade, not only the word "steel". For damage that is not heat, such as broken teeth, see our guide to chipping and broken teeth.
Check the blade line against your machine
Our catalogue sorts blades by process. KINS' BLUE is listed for cutting tubes, pipes and profiles on stationary and semi-automatic machines. KINS' RED is listed for solid steel bars. Look at the line page for your job, not only at one blade name.
If you cut solid bar with a tube blade, or tube with a bar blade, tell us. We will confirm which line to look at. The BLUE Stainless blade is a good example of why the material matters: the catalogue rates it 9 for Stainless Steel and 4 for Low/Med. Tensile.
What the catalogue says about HSS and heat
Our KINS' GREEN line is high-speed steel (HSS). The catalogue says these blades provide resistance to heat generated during the cutting process. It also says the line is used for applications with lower cutting speeds and wall thicknesses.
The catalogue does not say that an HSS blade stops burn marks, so we do not say it either. Tell us your machine and your material, and we will confirm if this line is worth a look.
Check the machine and the blade condition
Ratings are only part of the picture. Look at these points with your maintenance team, and follow the machine maker's instructions:
- Blade condition and fit: worn or chipped teeth, and whether the blade runs true on the shaft. Keep the old blade and send a photo.
- Cooling: whether it reaches the cut. Tell us how it is applied, and what you use.
- Timing: whether the marks started after a change, such as a new material, a new blade or new settings.
If the cut end is also rough or burred, our guide to burrs and rough ends covers that symptom. We give no coolant types, flow values or feed settings in this guide. The catalogue has none, and they depend on your machine. Tell us what you run and we will say what we need to know.
What to send us for a quote
- Photos of the blade teeth and of a cut end showing the marks.
- The blade you used: line, name and size, or a photo of the old blade.
- The material and its grade. For tube, add the tube size and wall thickness.
- The machine: stationary, semi-automatic or flying cut-off, and its make.
- How the cut is cooled, if at all.
- What changed before the marks appeared.
- The quantity of blades you need.
Request a quote on our website or message us on WhatsApp, and we will confirm the right blade for your job.