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  2. Steel grades - Wikipedia

    en.wikipedia.org/wiki/Steel_grades

    X8CrNiS18-9: 303: S30300: X10CrNiS18-9: 303S 31 En58M: X10CrNiS18-09: SUS 303 1.4301: X2CrNi19-11 X2CrNi18-10: ... General guide to the EN 10027 steel name and ...

  3. SAE steel grades - Wikipedia

    en.wikipedia.org/wiki/SAE_steel_grades

    SAE steel grades. The SAE steel grades system is a standard alloy numbering system (SAE J1086 – Numbering Metals and Alloys) for steel grades maintained by SAE International. In the 1930s and 1940s, the American Iron and Steel Institute (AISI) and SAE were both involved in efforts to standardize such a numbering system for steels.

  4. Supersonic transport - Wikipedia

    en.wikipedia.org/wiki/Supersonic_transport

    The SAI Quiet Supersonic Transport is a 12-passenger design from Lockheed Martin that is to cruise at Mach 1.6, and is to create a sonic boom only 1% as strong as that generated by Concorde. [50] The supersonic Tupolev Tu-444 or Gulfstream X-54 have also been proposed.

  5. Central Board of Secondary Education - Wikipedia

    en.wikipedia.org/wiki/Central_Board_of_Secondary...

    The Central Board of Secondary Education (CBSE) is a national level board of education in India for public and private schools, controlled and managed by the Government of India. Established in 1929 by a resolution of the government, the Board was an experiment towards inter-state integration and cooperation in the sphere of secondary education ...

  6. Social studies - Wikipedia

    en.wikipedia.org/wiki/Social_studies

    Social studies. In many countries' curricula, social studies is the combined study of humanities, the arts, and social sciences, mainly including history, economics, and civics. The term was first coined by American educators around the turn of the twentieth century as a catch-all for these subjects, as well as others which did not fit into the ...

  7. SST class airship - Wikipedia

    en.wikipedia.org/wiki/SST_class_airship

    The SST used a larger 100,000 cu ft (2,800 m 3) envelope than any of the other SS class types, and was equipped with a streamlined and waterproofed car that could accommodate a crew of five. [4] Two 100 hp (75 kW) Sunbeam or 75 hp (56 kW) Rolls-Royce Hawk engines were each mounted on a gantry either side of the car, and drove 9 ft (2.7 m ...

  8. 17-4 stainless steel - Wikipedia

    en.wikipedia.org/wiki/17-4_stainless_steel

    17-4 stainless steel. SAE Type 630 stainless steel (more commonly known as 17-4 PH, or simply 17-4; also known as UNS S17400) is a grade of martensitic precipitation hardened stainless steel. It contains approximately 15–17.5% chromium and 3–5% nickel, as well as 3–5% copper. [1] The name comes from the chemical makeup which is ...

  9. SAE 304 stainless steel - Wikipedia

    en.wikipedia.org/wiki/SAE_304_stainless_steel

    SAE 304 stainless steel is the most common stainless steel. It is an alloy of iron, carbon, chromium and nickel. It is an austenitic stainless steel, and is therefore not magnetic. It is less electrically and thermally conductive than carbon steel. It has a higher corrosion resistance than regular steel and is widely used because of the ease in ...