ALLOY 718 DESCRIPTION
Alloy 718 is Associate in Nursing age hardenablenickel-chromium alloy having high creep-rupture strength at high temperatures to concerning 1300°F (700°C). The age-hardenable alloy will be promptly made-up into advanced components. Its fastening characteristics,especially its resistance to postweld cracking, are outstanding.
Nuclear hold down spring and different elements
Gas turbine elements
Nickel + Cobalt: fifty.00 – 55.00
Chromium: seventeen.00 – 21.00
Molybdenum: a pair of.80 – 3.30
Columbium + Tantalum: four.75 – 5.50
Titanium: zero.65 – 1.15
Aluminum: zero.20 – 0.80
Cobalt: 1.00 max
Carbon: 0.80 max
Manganese: zero.35 max
Silicon: 0.35 max
Phosphorus: zero.015 max
Sulfur: 0.015 max
Boron: 0.006 max
Copper: 0.30 max
Density: 0.296 lbs/in³, 8.19 g/cm³
Specific Heat: Btu/lb °F (J/kg °C):
At 70°F (21°C): zero.104 (435)
Mean constant of Thermal Expansion: in/in/° (mm/m/°C)
70-212°F (20-100°C): seven.6 x 10 (13.0)
Modulus of Elasticity: KSI (MPa)
29.7 x 10³ (204.9 x 10³) in tension
Magnetic porousness, H = two hundred Oersteds:
Annealed and Aged: one.011
Melting Range: 2300-2437°F (1260-1336°C)
MECHANICAL PROPERTIES AT temperature
Ultimate Tensile Strength: one hundred twenty KSI min (827 MPa min)
Yield Strength: (0.2% offset) sixty KSI min (414 MPa min)
Elongation: thirtieth min ( gauges: > zero.040 inches)
Alloy 718 will be cold rolled to realize the temper properties needed by specific customers and/or producing necessities.
HEAT TREAT CAPABILITIES
Two heat treatments are typically used for Alloy 718 resolution temper at 1700-1850°F followed by fast cooling, typically in water, and precipitation hardening at 1325°F for 8hours, chamber cool to 1150°F, hold at 1150°F
for a complete aging time of eighteen hours, followed by air cooling.
Solution temper at 1900-1950°F followed by fast cooling, typically in water, and precipitation hardening at 1400°F for ten hours, chamber cool to 1200°F, hold at 1200°F for a complete aging time of twenty hours, followed by air cooling.
STANDARD WIRE FINISHES
Extra Clean: (XC) further clean is additionally observed as “bright treated” or “bright annealed and cold rolled”
Grease (round wire only): Drawn AN exceedingly|in a very} significant grease produces an “Ultra bright” end for ornamental applications
Soap (round wire only): Soap is employed as a stuff within the drawing method and isn't removed. It acts as a stuff throughout client half forming operation.
A soap end is out there in tempered merchandise.
Plated: several plating choices are accessible.
Cut to lengths
Alloy 718 will be hardened by:
Cold operating followed by Age Hardening
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