S5 Cold Work Tool Steel Plates Bars Sheet Forgings
Preheating: Heat at a rate not exceeding 400°F per hour (222°C per hour). For complex and large tools, heat to 1150-1250°F (621-677°C) and equalize. Then heat to 1300-1400°F (704-760°C) and equalize. For simple geometries, use only the second preheating temperature range.
S5 Shock-Resisting Tool Steel is a silicon-manganese tool steel which exhibits the highest impact toughness among all of the "S" type steels. The high toughness and the ability to be hardened to 62 Rockwell C make S5 an excellent choice for applications that require higher strength than S7 shock-resisting tool steel. The steel is typically hardened using an oil quench, but for simple geometries, the steel may be water quenched.
APPLICATIONS: Pneumatic tools, shear blades, mandrels, heavy-duty punches, and stamping dies.
COMPOSITION
C |
Mn |
Si |
Cr |
Mo |
V |
PHYSICAL PROPERTIES
Density: 0.280 lb/in3(7750 kg/m3)
Specific Gravity: 7.75
Modulus of Elasticity: 30 x 106 psi (207GPa)
Machinability: 65-70% of a 1% carbon steel
HARDENING
Critical Temperature:Ac1: 1410°F (766°C)
Preheating: Heat at a rate not exceeding 400°F per hour (222°C per hour). For complex and large tools, heat to 1150-1250°F (621-677°C) and equalize. Then heat to 1300-1400°F (704-760°C) and equalize. For simple geometries, use only the second preheating temperature range.
Austenitizing (High Heat): Heat slowly from the preheat. For Oil Quenching: 1600 - 1700°F (871 - 927°C) For Water Quenching: 1550 - 1650°F (842 - 899°C) Soak for 30 minutes for the first inch (25.4 mm) of thickness, plus 15 minutes for each additional inch (25.4 mm) of thickness.
Quenching: Oil or water to 150-125°F (66-51°C).
Tempering: Temper immediately after quenching. Hold at temperature for 1 hour per inch (25.4 mm) of thickness, 2 hours minimum, then air cool to ambient temperature. To minimize internal stresses in cross sections greater than 6 inches (152.4 mm) and to improve stability in tools that will be EDM’d after heat treatment, a soaking time of 4 to 6 hours at the tempering temperature is strongly recommended.
Cryogenic Treatment: Some prefer to do cryogenic treatment as an extension of the quench from the austenitizing treatment. Others prefer to cryogenically treat after tempering.
:Hubei Risunsteel Co., Ltd.
ANNEALING
Annealing must be performed after hot working and before re-hardening.
Heat at a rate not exceeding 400°F per hour (222°C per hour) to 1425 - 1475°F (773 - 801°C), and hold at temperature for 1 hour per inch (25.4mm) of maximum thickness; 2 hours minimum. Then cool slowly with the furnace at a rate not exceeding 50°F per hour (28°C per hour) to 1000°F (538°C). Continue cooling to ambient temperature in the furnace or in air. The resultant hardness should be a maximum of 229 HBW.More information .
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