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  2. Krupp armour - Wikipedia

    en.wikipedia.org/wiki/Krupp_armour

    Krupp armour was a type of steel naval armour used in the construction of capital ships starting shortly before the end of the nineteenth century. It was developed by Germany's Krupp Arms Works in 1893 and quickly replaced Harvey armour as the primary method of protecting naval ships, before itself being supplanted by the improved Krupp ...

  3. Case-hardening - Wikipedia

    en.wikipedia.org/wiki/Case-hardening

    Case-hardening or carburization is the process of introducing carbon to the surface of a low-carbon iron, or more commonly a low-carbon steel object, in order to harden the surface. Iron which has a carbon content greater than ~0.02% is known as steel .

  4. Hardening (metallurgy) - Wikipedia

    en.wikipedia.org/wiki/Hardening_(metallurgy)

    Martensitic transformation, more commonly known as quenching and tempering, is a hardening mechanism specific for steel. The steel must be heated to a temperature where the iron phase changes from ferrite into austenite, i.e. changes crystal structure from BCC (body-centered cubic) to FCC (face-centered cubic). In austenitic form, steel can ...

  5. Hardened steel - Wikipedia

    en.wikipedia.org/wiki/Hardened_steel

    Frequently, the term "hardening" is associated with tempered steel. Both processes are used hand in hand when hardening steel. The two part process begins with hardening the steel so that it becomes hard and does not wear over time. However, very often, this process leaves the steel very brittle and susceptible to breaking during use.

  6. CPM S30V steel - Wikipedia

    en.wikipedia.org/wiki/CPM_S30V_steel

    In 2009, Crucible Steel introduced an update to CPM-S30V to meet the needs of renowned knife maker Chris Reeve that they called CPM-S35VN. The addition of 0.5% Niobium, and reductions in both Carbon (from 1.45% to 1.40%) and Vanadium (from 4% to 3%) produced an alloy with 25% increase in measured Charpy V-notch toughness over S30V (Crucible claims 15-20% improvement).

  7. Ferritic nitrocarburizing - Wikipedia

    en.wikipedia.org/wiki/Ferritic_nitrocarburizing

    This also inversely affects the depth of the case; i.e., a high carbon steel will form a hard, but shallow case. [ 14 ] A similar process is the trademarked "Nu-Tride" process, also known incorrectly as the "Kolene" process (which is the company's name), includes a preheat and an intermediate quench cycle.

  8. Naval armour - Wikipedia

    en.wikipedia.org/wiki/Naval_armour

    Krupp armour was a type of steel armour used in the construction of capital ships starting shortly before the end of the nineteenth century. It was developed by Germany's Krupp Arms Works in 1893 and quickly replaced Harvey armour as the primary method of protecting naval ships, before itself being supplanted by the improved "Krupp cemented ...

  9. Quench polish quench - Wikipedia

    en.wikipedia.org/wiki/Quench_polish_quench

    Quench polish quench (QPQ) is a specialized type of nitrocarburizing case hardening that increases corrosion resistance. It is sometimes known by the brand name of Tufftride, Tenifer or Melonite. [1] Three steps are involved: nitrocarburize ("quench"), polish, and post-oxidize ("quench"). [2]

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