Bimetallic band saw blades stand as one of the most reliable and widely adopted industrial cutting tools for metal and timber processing, valued for their unique composite material structure that solves the long-standing conflict between cutting hardness and blade flexibility. Manufactured by Hangzhou Jinzhi Steel under the JINBIRD brand, these blades are engineered with electron beam welding technology, fusing two different steel materials into one integrated cutting strip.
The tooth tip is made of cobalt high-speed steel, commonly M42 or M51 grade. M42 contains 8% cobalt, reaching tooth hardness of HRC 67–69. It maintains its cutting edge even at high cutting temperatures up to 600°C, offering outstanding wear resistance and red hardness for daily metal cutting tasks. M51, with 10% cobalt content, delivers higher heat resistance and impact performance, tailored for cutting hardened steel, high-temperature alloys and tough stainless steel. The backing strip, by contrast, adopts high-toughness spring steel. This flexible base can endure repeated bending and tension as the blade cycles around band saw wheels, resisting fatigue cracks and sudden breakage during continuous heavy-duty cutting. This "hard teeth, tough back" design is the core advantage of bi-metal saw blades that single-material carbon steel blades cannot match.
Compared to traditional carbon steel band saw blades, premium bi-metal blades deliver a service life 3 to 10 times longer. This drastically lowers downtime for blade replacement and reduces overall cutting cost per workpiece. The tooth geometry is customizable, with variable pitch teeth being a popular choice to suppress cutting vibration, optimize chip evacuation and avoid tooth chipping. Coarse TPI (3–6 teeth per inch) suits large solid steel bars and thick workpieces for fast chip removal. Medium TPI (7–10 TPI) serves general profiles and solid metal. Fine TPI (10–18 TPI) works for thin-walled tubes and sheets, preventing tooth stripping during cutting.
Beyond metal cutting, M42 bi-metal band saw blades are widely used for cutting wood pallets embedded with nails, a common challenge in the recycling and packaging industries. Ordinary wood-cutting blades will quickly dull or break upon hitting nails, while bi-metal blades with HSS tips can smoothly cut through timber and embedded fasteners, greatly improving efficiency for pallet dismantling operations. This multi-scene capability makes bi-metal blades popular across machinery manufacturing, steel structure fabrication, logistics pallet recycling, automotive parts processing and hardware workshops.
Proper blade selection and maintenance are critical to maximize service life. Users must match tooth pitch according to workpiece thickness and material. Sufficient cutting fluid or coolant is required during metal cutting to lower cutting temperature and protect tooth edges. Incorrect tensioning or overly aggressive feed rate remains the top cause of premature blade failure. Over-tension leads to sudden fracture, while insufficient tension results in curved cuts and uneven tooth wear.
As a professional saw blade manufacturer, Jinzhi Steel supplies standard and custom bi-metal band saw blades, together with TCT circular saw blades and food processing saws for global clients. We continuously optimize welding stability, tooth grinding precision and heat treatment process. Our technical team supports custom specifications for special machine requirements and unique cutting materials. In today's competitive manufacturing industry, selecting a high-quality bi-metal band saw blade not only stabilizes cutting precision, but also controls production expenditure. Reliable cutting tools become quiet contributors to workshop productivity.
If you are looking for durable saw blades for metal cutting or nail-containing pallet processing, JINBIRD bi-metal band saw blades can be your trusted solution.