Resistance to Grain Growth

HAYNES® 230® alloy exhibits excellent resistance to grain growth at high temperatures. As a consequence of its very stable primary carbides, 230® alloy can be exposed at temperatures as high as 2200°F (1204°C) for up to 24 hours without exhibiting significant grain growth. Materials such as HAYNES® 188 alloy or HASTELLOY® X alloy exhibit greater grain growth under such conditions, as would most iron-, nickel-, or cobalt-base alloys and stainless steels.

Exposure Time Grain Size for Alloys Exposed at Temperature for Various Times*
HAYNES® 230® alloy HAYNES® 188 alloy HASTELLOY® X alloy
h 2150°F (1177°C)  2200°F (1204°C)  2150°F (1177°C) 2200°F (1204°C)  2150°F (1177°C) 2200°F (1204°C) 
0 4-4 1/2 4-4 1/2 4-5 4-5 3 1/2 3 1/2
1 4-5 4-4 1/2 2-5 2-4 3 1/2 0-1
4 4-4 1/2 4-4 1/2 3 1/2 3 3 1/2 0-1
24 4 4-4 1/2 0-2 1-3 00-4 0-1 1/2

*Plate Product in the fully annealed condition

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