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  2. Rockwell scale - Wikipedia

    en.wikipedia.org/wiki/Rockwell_scale

    The superficial Rockwell scales use lower loads and shallower impressions on brittle and very thin materials. The 45N scale employs a 45-kgf load on a diamond cone-shaped Brale indenter, and can be used on dense ceramics. The 15T scale employs a 15-kgf load on a 1 ⁄ 16-inch-diameter (1.588 mm) hardened steel ball, and can be used on sheet metal.

  3. Japanese swordsmithing - Wikipedia

    en.wikipedia.org/wiki/Japanese_swordsmithing

    Japanese swordsmithing. Japanese swordsmithing is the labour-intensive bladesmithing process developed in Japan beginning in the sixth century for forging traditionally made bladed weapons (nihonto) [ 1 ][ 2 ] including katana, wakizashi, tantō, yari, naginata, nagamaki, tachi, nodachi, ōdachi, kodachi, and ya (arrow).

  4. HY-80 - Wikipedia

    en.wikipedia.org/wiki/HY-80

    Permit class USS Plunger on the building ways at Mare Island. HY-80 is a high-tensile, high yield strength, low alloy steel.It was developed for use in naval applications, specifically the development of pressure hulls for the US nuclear submarine program and is still currently used in many naval applications.

  5. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    hardness, Rockwell, A scale: See Rockwell scale. HRB: hardness, Rockwell, B scale: See Rockwell scale. HRC: hardness, Rockwell, C scale: See Rockwell scale. HRS: hot rolled steel: HT TR: heat treat, heat treatment: H&T or H/T or HT: hardened and tempered: A form of heat treatment in which the metal is first hardened and then tempered. Compare N&T.

  6. List of blade materials - Wikipedia

    en.wikipedia.org/wiki/List_of_blade_materials

    The most common blade materials are carbon steel, stainless steel, tool steel, and alloy steel. Less common materials in blades include cobalt and titanium alloys, ceramic, obsidian, and plastic. The hardness of steel is usually stated as a number on the Rockwell C scale (HRC). The Rockwell scale is a hardness scale based on the resistance to ...

  7. U.S. Steel Tower - Wikipedia

    en.wikipedia.org/wiki/U.S._Steel_Tower

    For the building in New York formerly known as the U.S. Steel Building, see One Liberty Plaza. The U.S. Steel Tower, also known as the Steel Building, UPMC Building, or USX Tower (1988–2001), is a 64-story skyscraper at 600 Grant Street in downtown Pittsburgh, Pennsylvania. The interior has 2,300,000 sq ft (210,000 m 2) of leasable space.