열처리
Heat treatment
 
 
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