The data herein presented on the compositions and properties of the wrought corrosion-resistant and heat-resistant chromium and chromium-nickel steels and alloy castings have been assembled by Subcommittee I on Classification of Data, of Committee A-10 on Iron-Chromium, Iron-Chromium-Nickel, and Related Alloys, of the American Society for Testing Materials. The data in this publication represent (a) an interim revision of the “Tables of Chemical Compositions, Physical and Mechanical Properties of Wrought Corrosion-Resisting and Heat-Resisting Chromium and Chromium-Nickel Steels,” published by the A.S.T.M. in 1942, plus (b) an entirely new section of data on cast iron-chromium and iron-chromium-nickel alloys, not previously included in this publication. This is the first edition of these tables in which data for the cast alloys are presented along with the wrought. The present classification provides data on those stainless steels that have received the widest commercial usage. The data have been divided into two parts—Part I on Wrought Alloys and Part II on Cast Alloys. Section A of Part I covers the wrought hardenable and nonhardenable ferritic straight chromium steels. The ferritic steels hardenable by heat treatment are indicated in the tables as martensitic and those not hardenable as simply ferritic. Section B of Part I covers the wrought austenitic chromium-nickel steels. Part II covers the cast alloy materials of these general compositional ranges. Section A of Part II covers the corrosion-resistant alloys and Section B the heat-resistant alloys.