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 TABLE 2-1. Metals Preheating Chart (Continued)
Recommended
Metal
Metal
Preheat
Designation
Group
500F-800F
5% Cr. - 1/2% Mo. Steel
MEDIUM CHROME (Cr)
600F-900F
5% Cr. - 1/2% Mo. Steel
MOLY (Me) STEELS
600F-900F
8% Cr. - 1% Mo. Steel
300F-500F
12-14% Cr. Type 410
PLAIN HIGH
300F-500F
16-18% Cr. Type 430
CHROMIUM (Cr)
300F-500F
23-30% Cr. Type 446
STEELS
Usually does not require
18% Cr. - 8% Ni. Type 304
HIGH CHROME (Cr)
preheating but it maybe
25-12 Type 309
NICKEL (Ni)
desirable to remove
25-20 Type 310
COLUMBIUM (Cb)
chill.
18-8 Cb. Type 347
STAINLESS STEEL
18-8 Mo. Type 316
18-8 Mo. Type 317
2-10
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