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Base
Metal |
Preheat
Temp |
Postheat |
℉ |
℃ |
Low Carbon
Steel (up to 0.40%C) for thin sections only |
Not Required |
Not Required |
Air-Cool |
Low
Carbon Steel (up to 0.40%C) for thick sections
only
High Carbon Steel (over 0.40%C) for thin
sections only
Low Alloy Steels (up to 10% alloy) for thin
sections only |
200-600 |
93-315 |
Slow-Cool |
High Carbon
Steels (over 0.40%C) for thick sections
only
Low Alloy Steel (up to 10% alloy) for thick
sections only |
300-600 |
148-315 |
Slow-Cool |
Air-Quench
Steels |
1100-1200 |
593-648 |
Slow-Cool |
High Chromium-Nickel
(Austenitic) Stainless Steels
(304, 309, 316, etc.) thin sections only |
Not Required |
Not Required |
Air-Cool |
High Chromium-Nickel
(Austenitic) Stainless Steels
(304, 309, 316, etc.) thick sections only |
200-500 |
93-260 |
Slow-Cool |
High Chromium-Nickel
(Martensitic) Stainless Steels
(410, 416, 420, etc.) thick sections only |
400-600 |
204-315 |
Maintain
at 400℉~600℉ 4hrs.
per 1 inch thickness, then reduce heat by
50℉(10℃) per hour till cool |
High Chromium-Nickel
(Ferritic) Stainless Steels
(430, 442, 446, etc.) thick sections only |
200-600 |
93-315 |
Maintain
at 200℉~600℉ 4hrs.
per 1 inch thickness, then reduce heat by
50℉(10℃) till cool |
High Temperature
Nickel Alloys
(400, 600, 601, 625, 718, etc.) |
200-500 |
93-260 |
Stress-Relieve |
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