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  2. Steel grades - Wikipedia

    en.wikipedia.org/wiki/Steel_grades

    EN 10027-1 steel grade designation system. European standard steel grade names fall into two categories: [1] Steel specified by purpose of use and mechanical properties. Steel specified by chemical composition. The inclusion of a letter 'G' before the code indicates the steel is specified in the form of a casting.

  3. A572 steel - Wikipedia

    en.wikipedia.org/wiki/A572_steel

    A572 Steel Chemical Composition, Per ASTM standards [2]; A572 Grade Carbon Manganese Phosphorus Sulfur Silicon Grade 42: 0.21%: 1.35%: 0.030%: 0.030%: 0.15-0.40%

  4. SAE steel grades - Wikipedia

    en.wikipedia.org/wiki/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.

  5. Four square writing method - Wikipedia

    en.wikipedia.org/wiki/Four_Square_Writing_Method

    The four square writing method is a way for teaching writing to children in school. While primarily used to teach persuasive writing , it has also been used to help teach deconstruction . [ 1 ] The method was developed by Judith S. Gould [ 2 ] and Evan Jay Gould.

  6. Fuel oil - Wikipedia

    en.wikipedia.org/wiki/Fuel_oil

    Since No. 6 is the most common, "bunker fuel" is often used as a synonym for No. 6. No. 5 fuel oil is also called Navy Special Fuel Oil ( NSFO ) or just navy special ; No. 5 or 6 are also commonly called heavy fuel oil ( HFO ) or furnace fuel oil ( FFO ); the high viscosity requires heating, usually by a recirculated low pressure steam system ...

  7. List of primary education systems by country - Wikipedia

    en.wikipedia.org/wiki/List_of_primary_education...

    1st grade: 6 to 7 years old; ... group 3: age 6-7 (school curriculum starts with writing, reading, etc.) group 4: age 7-8 ... for example, if your birthday is between ...

  8. Ti-6Al-4V - Wikipedia

    en.wikipedia.org/wiki/Ti-6Al-4V

    Ti-6Al-4V (UNS designation R56400), also sometimes called TC4, Ti64, [1] or ASTM Grade 5, is an alpha-beta titanium alloy with a high specific strength and excellent corrosion resistance.

  9. 6061 aluminium alloy - Wikipedia

    en.wikipedia.org/wiki/6061_aluminium_alloy

    6061 is highly weldable, for example using tungsten inert gas welding (TIG) or metal inert gas welding (MIG). Typically, after welding, the properties near the weld are those of 6061-T4, a loss of strength of around 40%. The material can be re-heat-treated to restore near -T6 temper for the whole piece.

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