1.3243 tool steel 
 Details: 

 Features and application: 

 Tungsten molybdenum high speed steel cobalt generally improve the red hardness and hot hardness, improved wear resistance, better machinability, but lower strength and toughness, easy-to-oxidation and decarbonization, generally used as a gear cutter , milling tools, and punch, Cutter and other tools used for cutting hard materials. 

 Chemical Composition: 

 Carbon C: 0.80 ~ 0.90 (tolerance: ± 0.01) 

 Si Si: 0.20 ~ 0.45 (tolerance: ± 0.05) 

 Manganese Mn: 0.15 ~ 0.40 (tolerance: +0.04) 

 S S: ≤ 0.030 

 Phosphorus P: ≤ 0.030 

 Chromium Cr: 3.75 ~ 4.50 (tolerance: ± 0.05) 

 Ni: to allow the residual content of ≤ 0.30 

 Copper Cu: ≤ 0.25 to allow the residual content 

 Vanadium V: 1.75 ~ 2.25 (tolerance: ± 0.05) 

 Mo Mo: 4.50 ~ 5.50 (tolerance: size ≤ 6, ± 0.05; size> 6, ± 0.10) 

 Tungsten W: 5.50 ~ 6.50 (tolerance: size ≤ 10, ± 0.10; size> 10, ± 0.20) 

 Cobalt Co: 4.50 ~ 5.50 (tolerance: ± 0.15) 

 Mechanical Properties: 

 Hardness: the hardness of delivery: (other processing methods) ≤ 285HB; (annealing) ≤ 269HB. Quenching and tempering heat treatment system and the sample hardness: ≥ 64HRC 

 Heat treatment and microstructure specifications: 

 Standard heat treatment: quenching, 730 ~ 840 ℃ preheating, 1190 ~ 1210 ℃ (salt bath) or 1200 ~ 1220 ℃ (box-type furnace) heating, oil cooling, 540 ~ 560 ℃ tempered 2 times 2h. 

 Delivery condition: hot rolling, forging, annealing cold-drawn steel bar to the state of delivery, hot-rolled, forged steel bar to annealing + other processing methods (peeling, light pull, polished, or polished, etc.) delivered after processing 

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