QUENCH AND TEMPER CORROSION RESISTANT STEEL ALLOY

摘要

A quench and temper steel alloy is disclosed having the following composition in weight percent.;C0.2-0.5Mn0.1-1.0Si0.1-1.2Cr  9-14.5Ni2.0-5.5Mo1-2Cu  0-1.0Co1-4W0.2 max.V0.1-1.0Tiup to 0.5Nb  0-0.5Ta  0-0.5Al  0-0.25Ce  0-0.01La  0-0.01
The balance of the alloy is iron and the usual impurities including not more than about 0.01% phosphorus, not more than about 0.010% sulful, and not more than about 0.10% nitrogen. A quenched and tempered steel article made from this alloy is also disclosed. The steel article is characterized by a tensile strength of at least about 290 ksi, a fracture toughness (kIc) of at least about 65 ksi, good resistance to general corrosion, and good resistance to pitting corrosion.

主权项

1. A steel alloy comprising, in weight percent, about:C0.2-0.5Mn0.1-1.0Si0.1-1.2Cr  9-14.5Ni3.0-5.5Mo  1-1.75Cu0.1-1.0Co1-4V0.1-1.0Tiup to 0.5Al  0-0.25 the balance of the alloy is iron and usual impurities including not more than about 0.01% phosphorus, not more than about 0.001% sulfur, and not more than about 0.10% nitrogen.