KUSHAL METAL & STEEL INDUSTRIES

www.kushalmetal.com www.berylliumcopper.in 14 High Speed Steel Application Segments Cutting Tools Automotive Available Product Variants Long Products* Plates * Presented data refer exclusivly to long products. Please observe the detailed explanations at the end of the data sheet (pdf). Product Description BÖHLER S705 – "The Industrial One" The conventional high-speed steel for industrial applications in machining. With a well-balanced alloy position and cobalt content, this type always manages to get the job done. Cobalt-alloyed molybdenum high-speed steel with high hardness, excellent cutting properties, outstanding compressive strength, high hot hardness, and good toughness. Continuous cooling CCT curves A....Austenite B....Bainite K....Carbide P....Perlite M....Martensite RA...Retained Austenite 1....Edge or Face 2....Core 3....Jominy test: distance from quenched end Tempering Chart Holding time 3 x 2 hours Specimen size: square 25 mm Process Melting Airmelted Technical data Material designation 1.3243 SEL HS6-5-2-5 EN Standards 4957 EN ISO Properties  Toughness & Ductility : good  Wear Resistance : high  Compressive strength : very high  Edge Stability : high  Grindability : good  Hot Hardness (red hardness) : very high Austenitising temperature: 1200°C (2192°F) Holding time: 180 seconds A....Austenite B....Bainite K....Carbide P....Perlite M....Martensite RA...Retained Austenite Temperature O 550 to 570 C Slow heating to tempering temperature immediately after austenitising. || Dwell time in the furnace 1 hour per 20mm material thickness (at least 1 hour) || Slow cooling to room temperature || 3 tempering cycles recommended || Hardness see tempering chart Physical Properties Temperature (°C) Density (kg/dm³) Thermal conductivity (W/(m.K)) Specific heat (kJ/kg K) Spec. electrical resistance (Ohm.mm²/m) Modulus of elasticity (10³N/mm²) 20 7.9 21 0.42 0.49 224 O O Thermal Expansions between 20 C | 68 F and... Temperature (°C) -6m Thermal expansion (10 m/(m.K)) 100 10.5 200 10.83 300 11.14 400 11.47 500 11.81 600 12.12 700 12.44 Applications  Broaches and Reamers  Twist Drills and Taps  End Mills  Special Cutting Tools  Gear Cutting, Shaving and Shaping Tools  Blades for Sawing Machines Chemical Composition (wt. %) C 0.92 Cr 4.1 Mo 5 V 1.9 W 6.2 Co 4.8 Delivery condition Annealed Hardness (HB) 2 Tensile Strength (N/mm ) max. 280 | Drawn max 290HB max. 980 Annealing Temperature O 770 to 840 C Controlled slow cooling in furnace (10 to 20 °C/h / (50 to 68 °F/h) to approx. 600 °C (1112 °F), air cooling. Stress relieving Temperature O 600 to 650 C Slow cooling in furnace. || To relieve stresses set up by extensive machining or in tools of intricate shape. || After through heating, maintain a neutral atmosphere for 1-2 hours. Hardening and Tempering Temperature O 1,190 to 1,230 C Salt bath, vacuum || Preheating: 1st stage ~ 500 °C, 2nd stage ~ 850 °C, 3rd stage ~1050 °C || Austenitising: 1190 - 1230 °C, holding time after complete heating 80 seconds, maximum 150 seconds, to avoid material damage due to overheating. || Quenching: oil, warm bath (500 - 550°C), gas Heat treatment Quantitative phase diagram S705 BÖHLER SOLE DISTRIBUTOR