Material Comparison Views: 30

The core difference is cobalt content: standard HSS has none; cobalt HSS has 5-8% (M35 has 5%, M42 has 8%). Cobalt significantly improves red hardness - the ability to stay hard at high temperature. Comparison: 1. Red hardness: at 600 degrees C, standard HSS is HRC50 vs cobalt HSS HRC55-58; 2. Wear resistance: cobalt HSS is 2-3x; 3. Tool life: 3-6x on stainless, 2-3x on carbon steel; 4. Price: roughly 2x. Which is better value? Total cost tells the story - machining 304 stainless: standard HSS at 20 RMB machines 800 pieces = 0.025 RMB per piece; cobalt HSS at 40 RMB machines 4000 pieces = 0.01 RMB per piece. The cobalt tool costs twice as much per unit but only 40% per piece - and that is before counting tool-change cost, quality cost and efficiency. Cobalt means fewer tool changes and higher machine utilization, stable quality with less rework, and higher parameters for better efficiency. Overall, cobalt HSS total cost is only 50-60% of standard HSS! Conclusion: for difficult materials like stainless and alloy steel, cobalt HSS is a must - standard HSS actually costs more; for general materials like carbon steel and aluminum, cobalt HSS still wins on value. Lihao Technology cobalt HSS countersinks - imported M35/M42, TiAlN nano-coating, factory-direct, outstanding value.