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  2. Steel grades - Wikipedia

    en.wikipedia.org/wiki/Steel_grades

    In order to clearly distinguish the steel grade, tubing, casing and its coupling should be painted with color codes respectively. Color bands should be painted on tubing and casing body longer than 600mm to either end. The whole outer-body of the coupling needs to be painted color and then color codes

  3. List of RAL colours - Wikipedia

    en.wikipedia.org/wiki/List_of_RAL_colours

    Mandatory for all steel work in P&G / mandatory for taxis in Germany since 1971, although in limited states only in recent years. RAL 1016: Sulfur yellow: Standard European ambulance colour in accordance with CEN 1789. [2] RAL 1017: Saffron yellow: RAL 1018: Zinc yellow: RAL 1019: Grey beige: RAL 1020: Olive yellow: RAL 1021: Colza yellow

  4. Threaded rod - Wikipedia

    en.wikipedia.org/wiki/Threaded_rod

    Metric threaded rods are marked on the end with a color code to define the ISO strength class. The color codes are: [9] Unmarked — 4.6 class (tensile strength = 400 N/mm 2, yield strength 240 N/mm 2) Yellow — 8.8 class (800 N/mm 2, 640 N/mm 2) Green — A2 stainless steel (304) Red — A4 stainless steel (316) White — 10.9 class (1000 N ...

  5. 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.

  6. Chemical coloring of metals - Wikipedia

    en.wikipedia.org/wiki/Chemical_coloring_of_metals

    Solution of sodium polysulfide 2.5%, items must be submerged in the solution after color developing, wash, dry and wax or varnish colored object. [27] Brown for copper. Items are boiled in at least 3-day-old water solution of 12% copper sulfate, after color being developed, the material is washed, dried and waxed or varnished. [27] Black for iron

  7. Pipe marking - Wikipedia

    en.wikipedia.org/wiki/Pipe_marking

    Background Color Text Color Carbon Dioxide: Gray: Black or White Helium: Brown: White Medical Air: Yellow: Black Oxygen: Green: White [e] Oxygen/Carbon Mixtures: Green: White Nitrogen: Black: White Nitrous Oxide: Blue: White Waste Anesthetic Gas Disposal: Purple: White Medical Surgical Vacuum: White: Black Non-Medical Air: Yellow/White Diagonal ...

  8. HuffPost Data

    projects.huffingtonpost.com

    Interactive maps, databases and real-time graphics from The Huffington Post

  9. Spark testing - Wikipedia

    en.wikipedia.org/wiki/Spark_testing

    The sparks will be white in color. [1] [5] Medium-carbon steel This steel has more forking than mild steel and a wide variety of spark lengths, with more near the grinding wheel. [5] High-carbon steel High-carbon steel has a bushy spark pattern (much forking) that starts at the grinding wheel. The sparks are not as bright as the medium-carbon ...

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