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Designer and Manufacturer of Precision Springs Since 1939

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Stress Relief Chart

Spring wire that gets shaped has to have the bending stress relieved in the form of heat treating. Various wire materials require different lengths of time for stress relief.

The process of baking out the stress in the wire may change the dimensions of your spring. Stainless steel coils will generally expand slightly when heated: music wire coils will generally contract slightly.

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