EnglishHow to Heat Treat Spring Steel
Definition of Heat Treating Springs:
Wire springs are placed in an oven or furnace for a certain time and temperature to relieve stress as well as to temper the spring wire to give the spring its elasticity and memory.
China Spring Products Corp's Heat Treating Chart
| Material | Outer Diameter - Opens / Closes | Temperature | Time |
|---|---|---|---|
| Aluminum | none | 400º F | 30 minutes |
| Beryllium Copper ASTM B197 | Closes 1% | 600º F | 30 mins. - 2 hours |
| Beryllium Copper 25 1/2 Hard | none | 600º F | 30 minutes |
| Brass | none | Just warm up | Just warm up |
| Bronze | none | 350º | 15 minutes |
| Chrome Silicon ASTM A401 | Closes | 800º F | 30 minutes |
| Chrome Vanadium ASTM A231 | Closes | 800º F | 30 minutes |
| Elgiloy (open more in salt) | Opens 3% | 900º F | 5 hours |
| Hard Drawn ASTM A227 | Closes | 550º F | 20 minutes |
| Hastelloy C-22 | none | Stress Relief @ 750 F - 840 F | 30 minutes |
| Inconel QQ-W-390 | none | 700ºF - 900ºF | 1 hour |
| Inconel No. 1 Temper | Does not move | 1375º F | 16 hours then reduce to 700º for 1 hour |
| Inconel X Spring Temper | none | 1250º F | 4 hours |
| Inconel X-750 AMS 5698, 5699 | none | 1225º F | 4 hours |
| Inconel 600 | none | 900º F | 1 hour |
| Inconel 718 | none | 1375º F | 16 hours |
| Monel K 500 QQ-N-286 | none | 1000º F | 4 hours |
| Maraging Flat Stock | Does not move | 950º F | 4 hours NO LESS |
| Maraging Flat | Does not move | 850º F | 30 minutes |
| MP35N | none | 1200º F | 4 hours |
| Monel 400 AMS 7233 | Does not move | 600º F | 1 hour |
| Music Wire ASTM A 228 | Closes | 500º F | 30 minutes |
| Ni Span C Alloy 902 50% Cold | none | 900º F | 5 hours |
| Ni Span C (on big wire) | Opens some | 1250º F | 3 hours |
| Oil Tempered ASTM A 229 | Closes | 500ª F - 600º F | 30 minutes |
| Premier | none | 600º F - 650º F | 15 - 30 minutes |
| Rene 41 | none | 1400º F | 16 hours |
| Rocket Wire Min. Tensile Strength 25KS | none | 525º F | 2 hours |
| Stainless Steel 17-7 PH or 17-4 ASTM A 313 (631) | Opens a little | 900º F | 1 hour |
| Stainless Steel 302/304 ASTM A 313 | Opens | 600º F - 650º F | 30 minutes |
| Stainless Steel 316 ASTM A 313 (631) | Does not move | 700º F | 1 hour |
| Titanium | Opens (like Stainless Steel) | 800º F | 10 hours |
| Valve Oil Tempered | Closes | 500º F - 600º F | 30 mins. or until blue on ends |