Strengthenable ethylene pyrolysis alloy

Details Strengthenable ethylene pyrolysis alloy Strengthenable ethylene pyrolysis alloy

1996-06-13

1999-02-23

Phipps, Margery

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148316, 148319, 428627, 201 13, 48 4, C23C 820, C23C 822

Patent

active

058739505

ABSTRACT:
There is provided a nickel-base alloy with service enhanced strengthening properties. When exposed to ethylene pyrolysis conditions, namely a carbon containing environment and at temperatures of at least about 900.degree. C., the alloy forms M.sub.6 C and MC carbides that strengthen the alloy. The alloy may be formed into internally finned tubing.
The alloy includes about 0.08-0.11% carbon, 41-45% nickel, 23-26% chromium, 0.6-0.95% manganese, 1-1.7% silicon, 0.2-0.6% titanium, 0.25-0.55% aluminum, 1.3-1.7% molybdenum, 0.25-0.6% niobium, 0.15-0.45% tantalum, 0-0.2% tungsten, 0.001-0.005% boron, 0.01-0.03% zirconium, and the balance iron with trace commercial impurities.

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patent: 4443406 (1984-04-01), Sukekawa et al.
patent: 4530720 (1985-07-01), Moroishi et al.
patent: 5021215 (1991-06-01), Sawaragi et al.

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