High Speed Steel T4 1.3255 SKH3

Question

Introduce: 1.3255 high speed steel is tungsten type tool steel. It is a deep hardening alloy capable of Rockwell C 64 hardness. Din 1.3255 Tungsten-cobalt high speed tool steel as per DIN/ ASTM / AISI standard. It’s equivalent to AISI T4 steel, comparing with AISI T1 high speed steel T4 added 5% cobalt to increase the heat resistance. This material also has considerable toughness and easy to grinding. After quenching, the surface hardness can reach 66-70HRC. Equivalent Grades: Material No. 1.3255 DIN AISI EN S18-1-2-5 T4 HS18-1-1-5 Chemical Composition (in weight %): C Si Mn Cr Mo Ni V W Co 0.79 0.45 max 0.40 max 4.15 0.65 - 1.55 18.00 4.75 Physical properties (average values) at ambient temperature: Modulus of elasticity [103 x N/mm2] 217 Density [g/cm3] 8.70 Thermal conductivity [W/m.K]: 19.0 Electric resistivity [Ohm mm2/m]: 0.65 Specific heat capacity [J/g.K]: 0.46 Weight Tolerance +/-10% (maximum for each Size) Applications: Generally used as cutting tools, broaches and cold extrusion punches, turning and milling cutters for roughing work. Soft Annealing: Heat to 820-850°C, cool slowly in furnace to 550°C then air. This will produce the maximum Brinell Hardness of 265. Stress: Stress relieving to remove machining stresses should be carried out by heating to 600-650oC, holding for one hour at heat, followed by aircooling. This operation is performed to reduce distortion during heat treatment. Hardening: Stress relieving to remove machining stresses should be carried out by heating to 600-650oC, holding for one hour at heat, followed by aircooling. This operation should be performed to reduce distortion during heat treatment. Tempering: Tempering temperature: 2 x 560-580oC. Hardness after tempering is 64-65 HRC. Smelting Method Non-Vacuum furnace+LF+ESR Form of DIN 1.3255/T4 Round / Square / Flat Bars, Blocks Rounds diameter Range Specifications Forged Rounds: Φ51-Φ250 Hot rolled Rounds: Φ15-Φ55 Cold drawn Rounds: Φ3.0-Φ14 Cold drawn wires: Φ1.0-Φ14 Black or polished bright or machined Recommendations： 1.High Speed Steel T1 1.3355 SKH2 2.High Speed Steel M35 1.3243 SKH55 3.High Speed Steel M42 1.3247 SKH59 4.High Speed Steel M2 1.3343 SKH51 High Speed Steel T4 1.3255 SKH3 website:http://www.dldtsteeltools.com/high-speed-steel/high-speed-steel-t4-1-3255-skh3/