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...

F - Mech Eng,Light,Heat,Weapons

16

L

F16L 58/00 (2006.01) C22C 38/18 (2006.01)

Patent

CA 2510987

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 15µm or more. Preferably .DELTA.Hv of the tube is 100 or more, wherein .DELTA.Hv 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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