Heat-resistant cast steel excellent in aged ductility and...

Details Heat-resistant cast steel excellent in aged ductility and... Heat-resistant cast steel excellent in aged ductility and...

2004-10-18

2008-10-28

Wyszomierski, George (Department: 1793)

Metal treatment

Stock

Ferrous

C420S040000, C420S054000, C420S055000

Reexamination Certificate

active

07442265

ABSTRACT:
A heat-resistant cast steel excellent in high-temperature strength, aged ductility and creep rupture strength for use as a material for steam reforming reaction tubes in fuel cell hydrogen generation systems and the like. The cast steel has a chemical composition comprising, in mass %, 0.1 to 0.5% of C, up to 2.5% of Si, up to 2.5% of Mn, 15 to 26% of Cr, 8 to 23% of Ni, 0.1 to 1.2% of Nb, 0.01 to 1.0% of Ti, 0.001 to 0.15% of Ce, up to 0.06% of N and the balance substantially Fe, the cast steel being 20 to 45 in the parameter value P calculated from the expression:in-line-formulae description="In-line Formulae" end="lead"?P=89.3−78.4C+0.1Si−5.7Mn−1.7Cr +0.01Ni+2Nb+5.3Ti−36.5N−50.8Ce.in-line-formulae description="In-line Formulae" end="tail"?When desired, the steel contains at least one of 0.001 to 0.05% of B, 0.01 to 0.5% of Zr and 0.001 to 0.15% of La, and/or 0.01 to 0.3% of Al. Further when desired, the C, Cr and Ni contents are limited to 0.1 to 0.3% of C, 15 to 20% of Cr and 8 to 18% of Ni.

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