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Description:
It is an air or oil hardening tool steel that is characterized by very high impact toughness. The combination of strength and high toughness makes it a candidate for a wide variety of tooling applications. It can be used successfully for both cold and hot work applications. Also suitable for hot work tools where the operating temperature does not exceed 1000°F (538°C). For plastic injection molds, S7 tool steel is available as a remelted, mold-quality product. The remelting process minimizes the number and sizes of nonmetallic inclusions in the steel, and thereby enhances the polishability for critical cavity, insert, and other tooling surfaces.
APPLICATIONS
Recommended for cold work tools that require resistance to high impact and shock loading, such as shear blades, swaging dies, gripper dies, chisels, and punches
Chemcial Composition (%):
GRADE(%) |
C |
Si |
Mn |
Mo |
Cr |
P/S |
S-7 |
0.48-0.55 |
0.25-0.35 |
0.65-0.75 |
1.30-1.40 |
3.00-3.25 |
<=0.03 |
PHYSICAL PROPERTIES
Density: 0.283 lb/in3 (7833 kg/m3)
Specific Gravity: 7.83
Modulus of Elasticity: 30 x 106 psi (207GPa)
Thermal Conductivity: 16.5 BTU/hr-ft-°F (28.5 W/m/°K)
Machinability: 70-75% of a 1% carbon steel
HEAT TREATING INSTRUCTIONS
Hardening
Critical Temperature:
Ac1: 1460°F (793°C) Ac3: 1540°F (838°C)
Ar1: 1390°F (754°C) Ar3: 1310°F (710°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. Furnace or Salt: 1725°F (941°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: Air, pressurized gas, or warm oil to 150-125°F (66-51°C). Note: Sizes over 2½ inches (63.5mm) in cross section will not achieve full hardness by cooling in air. It is necessary to increase the quench cooling rate between 1400 to 900°F (760 to 482°C) by using pressurized gas or an interrupted oil quench. For the oil quench, quench until black, about 900°F (482°C), then cool in still air to 150-125°F (66-51°C).
Huangshi Young Sea Industry & Trade Co.,Ltd.
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Tel/Fax: +86-714-6330300
Tel/Fax: +86-714-6330300
Email: info@youngseaindustry.com
Contact Person: Celia Wu
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Cellphone:+86-189 3466 2770
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