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2. A36 steel - Wikipedia

   en.wikipedia.org/wiki/A36_steel

   A36 steel is a common structural steel alloy used in the United States. [1] The A36 (UNS K02600) standard was established by the ASTM International. The standard was published in 1960 and has been updated several times since. [2] Prior to 1960, the dominant standards for structural steel in North America were A7 (until 1967 [3]) and A9 (for ...

3. Defensive fighting position - Wikipedia

   en.wikipedia.org/wiki/Defensive_fighting_position

   A foxhole is one type of defensive strategic position. It is a "small pit used for cover, usually for one or two personnel, and so constructed that the occupants can effectively fire from it". [ 1 ] It is known more commonly within United States Army slang as a " fighting position " or as a " ranger grave ". It is known as a " fighting hole ...

4. Manhole cover - Wikipedia

   en.wikipedia.org/wiki/Manhole_cover

   A round manhole and its cover. A manhole cover is a removable plate forming the lid over the opening of a manhole, an opening large enough for a person to pass through that is used as an access point for an underground vault or pipe. It is designed to prevent anyone or anything from falling in, and to keep out unauthorized persons and material.

5. Pitting corrosion - Wikipedia

   en.wikipedia.org/wiki/Pitting_corrosion

   Pitting corrosion. Appearance. Severe pitting corrosion problems caused by chloride ions on a truss beam of the Nandu River Iron Bridge (Hainan Province, China) leading to the complete rupture of a metallic element. Pitting corrosion, or pitting, is a form of extremely localized corrosion that leads to the random creation of small holes in metal.

6. Suppressive fire - Wikipedia

   en.wikipedia.org/wiki/Suppressive_fire

   Suppressive fire is a tactic to reduce casualties to friendly forces and enable them to conduct their immediate mission. For example, a suppressed target will be unable to engage vulnerable forces that are moving without cover. This enables forces to advance to new positions or close with the enemy.

7. SAE steel grades - Wikipedia

   en.wikipedia.org/wiki/SAE_steel_grades

   Malleable iron. Wrought iron. 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.