How to choose a high-speed hacksaw blade?

Regarding the method of choosing a high-speed hacksaw blade:
High-speed steel DMO5, No.13343 (M2) High-speed steel (5% molybdenum) is the standard basic material for the manufacture of metal circular saw blades. The saw blade made of this material is very ideal for cutting metal materials with medium and low tensile strength (tensile strength 500N/mm 2 ~ 800N/mm 2 ) and is widely used in various manual, semi-automatic and fully automatic pipe cutting machines.
Cobalt alloy high-speed steel EMO5, CO5 (M35) HSS-E (5% cobalt) is a high-quality alloy high-speed steel. Saw blades made of this material are used to cut materials that are difficult to cut. (Tension strength exceeds 800N/mm2) is mainly used in semi-automatic and fully automatic pipe cutting machines, which will significantly extend the service life of the tool.

High-speed hacksaw blade surface treatment material:
1. Titanium nitride coating (TiN). Suitable for high-speed sawing, especially saw steel pipes or profiles.
2. Titanium aluminum aluminum coating (TiAIN). High temperature resistant, suitable for high-speed sawing or sawing superhard materials.
3. Titanium carbonitride coating (TiCN). The coefficient of friction is lower than that of titanium nitride coated saw blades, which have a longer life, and are used to saw a variety of steel and stainless steel materials.
4. Chromium nitride coating (CrN). Low coefficient of friction, longer life of saw blades, and are used for sawing and cutting of non-ferrous metals.