Stainless steel duplex stainless steels are achieved with an overall lower alloy content than similar-performing super-austenitic grades, making their use cost-effective for many applications. Duplex grades are characterized into groups based on their alloy content and corrosion resistance. Precipitation hardening stainless steels have corrosion resistance comparable to austenitic varieties, but can be precipitation hardened to even higher strengths than the other martensitic grades. The most common, 17-4PH, uses about 17% chromium and 4% nickel. The designation "CRES" is used in various industries to refer to corrosion-resistant steel. Most mentions of CRES refer to stainless steel, although the correspondence is not absolute, because
The Stainless Steel Rat Law of Robotics", which featured the Stainless Steel Rat in the setting of Isaac Asimov's "Robot" series. "The Return of the Stainless Steel Rat", a board game inspired by the character, was published by SPI in their magazine "Ares" in the late 1970s. Designed by Greg Costikyan, the game involved the Rat infiltrating a space station under hostile control. Angelina diGriz is a criminal mastermind much like the Rat, only less ethical and more willing to kill. As the Rat's first case for the Special Corps, he tracks Angelina down and ends up falling in love with her. After her