Definition of case-hardened in English:

case-hardened

adjective

  • 1(of a material) having a hard surface.

    ‘case-hardened sandstones’
    • ‘When the stone was properly seasoned, the exposed surfaces were case-hardened, creating a finish more resistant to weathering.’
    1. 1.1(of iron or steel) having been given a hard surface by being carburized.
      ‘a case-hardened steel anvil’
      • ‘Fusion-welded overlays have strong bonds, but the primary surface-hardened steels used in wear applications with fatigue loads include heavy case-hardened steels and flame or induction-hardened steels.’
      • ‘Dual-sided hinges with case-hardened steel pins further bolster security.’
      • ‘The sixshooter comes in 3 1/2-inch and 4 1/2-inch barrels and sports a standard blue finish with case-hardened frame.’
      • ‘Originally the barrels of 1888 Springfields were blued and the breeches were case-hardened.’
      • ‘Super Stud ATV tire chains are made of case-hardened alloy chain heat-treated as a single unit after assembly, and uses two studs on every other link for maximum traction.’
      • ‘The bolts are similarly machined from case-hardened steel alloy.’
      • ‘They included but were not limited to extra long or extra short barrels, extra heavy or extra light barrels, set triggers, pistol grip stocks, shotgun butts, color case-hardened actions, and you get the picture.’
      • ‘Revolvers include the 1873 Single Action in blue / case-hardened, nickel and stainless steel finishes, plus an enhanced photo-engraved model.’
      • ‘It is made of 14-gauge steel and features a pry-resistant door that locks with four half-inch diameter, case-hardened steel bolts.’
      • ‘First, in a case-hardened steel, the hardenability of both case and core must be considered.’
    2. 1.2Made callous or tough by experience.
      ‘a case-hardened politician’
      • ‘It's just that case-hardened nit-pickers like me can't help noticing these things.’
      • ‘Sometimes, even when you are a case-hardened professional, you see history differently.’
      • ‘But, regardless of how well the interviewers are trained, case-hardened criminals are unlikely to take these bogus coppers seriously, and might find it easy to ‘pull the wool over their eyes’.’
      • ‘But those same flames also case-hardened developing nations.’