| | Carbon | $ | 400°C (750°F) — strength loss above this | |
| | Carbon | $ | 400°C (750°F) — strength loss above this; Q&T tempers overage at higher temps | |
| | Carbon | $ | 150–200°C continuous (Q&T tempers overage above this) | |
| | Carbon | $ | 320°C — lead inclusions migrate/melt above this (lead m.p. 327°C) | |
| | Stainless | $$$ | ~315°C (600°F) continuous before overaging softens hardened material | |
| | Stainless | $$$ | ~300°C (570°F) continuous — duplex embrittles above this from 475°C and sigma-phase mechanisms | |
| | Carbon | $ | ~425°C (800°F) — Q&T tempers begin overaging above this | |
| | Carbon | $ | ~425°C (800°F) — Q&T tempers begin overaging at higher temperatures | |
| | Carbon | $$ | ~425°C (800°F) — Q&T tempers begin overaging above this | |
| | Carbon | $ | 200°C continuous (Q&T tempers overage above this) | |
| | Carbon | $ | ~425°C (800°F) — carburized case begins overaging above this | |
| | Tool | $$$ | ~200°C continuous before tempering effects soften | |
| | Carbon | $ | 400°C (750°F) before strength loss becomes significant | |
| | Aluminum | $$ | 150°C continuous (T3/T8 overage above this) | |
| | Aluminum | $$ | 150–175°C continuous (better hot strength than 7075) | |
| | Aluminum | $ | 150–175°C — softens above this (H tempers anneal toward O) | |
| | Aluminum | $ | 65°C upper for marine immersion (5083 territory above); 175°C upper for non-corrosive air | |
| | Aluminum | $$ | 65°C upper for sustained marine service (sensitization above this) | |
| | Aluminum | $ | 150–170°C continuous (above this, T6 strength degrades rapidly) | |
| | Aluminum | $ | 150–165°C continuous (T5/T6 overage above this) | |
| | Aluminum | $$$ | 120–150°C continuous (overaged temper holds strength better than T6 at temp) | |
| | Aluminum | $$ | 100–120°C continuous (above this, T6 overages and loses strength) | |
| | Copper | $$ | ~200°C continuous (above this, annealed structure overages and properties drift) | |
| | Copper | $$ | ~200°C continuous — above this, cold-worked tempers anneal | |
| | Copper | $$ | ~200°C continuous — above this, cold work anneals out | |
| | Copper | $$$ | ~200°C continuous — cold-worked tempers anneal above this | |
| | Copper | $$ | ~230°C (450°F) continuous — above this, lead inclusions can melt-out from surface | |
| | Copper | $$$ | ~315°C (600°F) continuous — significantly higher than tin bronze; no Pb to limit | |
| | Tool | $$$ | ~200°C continuous before tempering effects soften | |
| | Tool | $$$ | ~540°C (1000°F) continuous — the hot-work design temperature; remains hard at red heat | |
| | Tool | $$$$ | ~540°C (1000°F) continuous — the "red hardness" temperature; M2 retains hardness up to this point | |
| | Aluminum | $$ | 150°C continuous — thermal cycling up to ~425°C (800°F) under controlled conditions | |
| | Tool | $$ | ~175°C continuous before tempering effects soften | |
| | Tool | $$$ | ~200°C continuous before tempering effects soften (similar to A2) | |
| | Stainless | $$ | ~870°C continuous in oxidizing atmosphere (carbide precipitation a concern above 425°C — see 304L) | |
| | Stainless | $$ | ~870°C continuous in oxidizing atmosphere; sensitization concern 425–870°C for standard 316 (use 316L) | |
| | Stainless | $$ | ~390°C (730°F) for corrosion-controlled service; tempered hardness loss begins above tempering temperature | |
| | Stainless | $ | ~815°C (1500°F) continuous in oxidizing atmosphere — excellent scaling resistance | |
| | Titanium | $$$ | ~425°C (800°F) continuous — above this oxidation accelerates and creep matters | |
| | Titanium | $$$$ | Same as Grade 5 — 315–427°C continuous, alpha-case above 540°C in air | |
| | Titanium | $$$ | 315–427°C continuous; mechanical properties retained to ~400°C; oxidation above ~538°C | |
| | Titanium | $$$ | ~315°C (600°F) continuous; usable up to ~427°C short-term with reduced strength | |
| | Tool | $ | ~150°C continuous — lowest tempering tolerance of common tool steels | |