Steel tube excellent in exfoliation resistance of scale on...

Details Steel tube excellent in exfoliation resistance of scale on... Steel tube excellent in exfoliation resistance of scale on...

2008-05-27

2008-05-27

Yee, Deborah (Department: 1793)

Metal treatment

Stock

Ferrous

C148S327000

Reexamination Certificate

active

11165196

ABSTRACT:
A steel tube excellent in exfoliation resistance of scale on its inner surface is provided. The steel tube includes 9 to 28% by mass of Cr and has a maximum height of profile (Rz) on the inner surface after cold working of 15 μm or more. Preferably ΔHv of the tube is 100 or more, wherein ΔHv is the difference in Vickers hardness between an inner surface layer and a thickness center part of the tube. The steel may desirably have a microstructure of ASTM austenite grain size No.7. or more.

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