Alloy steel

摘要

The invention provides an alloy steel having the following composition: Ni 5-14 wt %; Cr 4-16 wt %; Co 7-14 wt %; Mo 1-5 wt %; W 0-5 wt %; Ti 0-0.8 wt %; Al 0.1-3 wt %; the balance being Fe save for incidental impurities. This provides an ultra-high strength corrosion resistant steel with good toughness, which does not significantly creep at temperatures up to 450° C. The high quantity of alloying to elements, particularly chromium, also gives the alloy good corrosion resistance. The alloy is particularly suitable for main shafts of gas turbine engines.

主权项

1. A turbine shaft comprising an alloy steel consisting essentially of the following composition: Ni 5-9 wt %; Cr 8-12 wt %; Co 7-10 wt %; Mo 2-4 wt %; W 2-3 wt %; Ti<0.01 wt %; Al 1-2.5 wt %; the balance being Fe save for incidental impurities.