Metal Designation and Identification

• 1 - carbon
• 2 - nickel
• 3 - nickelchromium
• 4 - molybdenum
• 5 - chromium
• 6 - chromium-vanadium
• 7 - tungsten
• 8 - nickel-chromium-molybdenum
• 9 - silicon-manganese
• Carbon steels

  10xx

  11xx

  12xx

  15xx
• Manganese steels

  13xx
• Nickel steels

  23xx

  25xx
• Molybdenum steels

  40xx

  44xx
• Nickel-chromium steels

  31xx

  32xx

  33xx

  34xx
• Chromium-molybdenum (Chromoly) steels

  41xx
• Nickel-chromium-molybdenum steels

  43xx

  43BVXx

  47xx

  81xx

  81Bxx

  86xx

  87xx

  88xx

  93xx

  94xx

  97xx

  98xx
• Chromium steels

  50xx

  50xxx

  50Bxx

  51xx

  51xxx

  51Bxx

  52xxxx
• Nickel-molybdenum steels

  46xx

  48xx
• Chromium-vanadium steels

  61xx
• Tungsten-chromium steels

  72xx
• Silicon-manganese steels

  92xx
• High-strength low-alloy steels

  9xx

  xxBxx

  xxLxxx