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Designer and Manufacturer of Precision Springs Since 1939

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  • NORTHEAST PLANT

    1.800.816.5613
  • CATALOG DIVISION

    1.800.424.0500
  • CORPORATE

    1.412.684.1201
  • SOUTHEAST PLANT

    1.800.933.7774
  • SOUTHWEST PLANT

    1.800.238.3510

Stress Relief Chart

Material Outer Diameter (Opens/Closes) Temperature Time
Hard Drawn closes 550 F 20 mins
K Monel   1000 F 4 hours
Monel not move 600 F 1 hours
Valve Oil Tempered closes 600 F mins or until blue on ends
Oil Tempered closes 500 F - 600 F 30 mins
Music Wire closes 500 F 30 mins
Stainless Steel 302 opens 600 F - 650 F 30 mins
Stainless Steel 316 does not move 700 F 1 hour
Stainless Steel 17-7PH or 17-4PH opens a little 900 F 1 hour
Inconel 718   1375 F 16 hours
Inconel   700 F - 900 F 1 hour
Inconel No. 1 Temper does not move 1375 F 16 hours then reduce to 700 F for 1 hour
Inconel X-750   1225 F 4 hours
Inconel 600   900 F 1 hour
Inconel X Spring Temper   1250 F 4 hours
Chrome Silicone closes 800 F 30 mins
Chrome Vanadium closes 800 F 30 mins
Bronze   350 F 15 mins
Beryllium Copper closes 1% 600 F 30 mins to 2 hours
Beryllium Copper 25 1/2 hard   600 F 30 mins
Elgiloy (open more in salt) opens 3% 900 F 5 hours
Aluminum   400 F 30 mins
Brass   just warm up just warm up
Basic   none none
Premier   600 F - 650 F 15 to 30 mins
Rene 41   1400 F 16 hours
Ni Span C (on big wire) opens some 1250 F 3 hours
Ni Span C Alloy 902 50% cold worked   900 F 5 hours
Titanium opens (like SS) 800 F 10 hours
Maraging Flat Stock does not move 950 F 4 hours NO LESS
Maraging Wire does not move 850 F 30 mins
MP35N   1200 F 4 hours
Hastelloy C-22   Stress Relief @ 750 F-840 F 30 mins
Rocket Wire Min. Tensile Strength 25 KS   525 F 2 hours