Comparison
| Defining property | AISI-SAE grade | Significant characteristics |
|---|---|---|
| Water-hardening | W | |
| Cold-working | O | Oil-hardening |
| A | Air-hardening; medium alloy | |
| D | High carbon; high chromium | |
| Shock resisting | S | |
| High speed | T | Tungsten base |
| M | Molybdenum base | |
| Hot-working | H | H1–H19: chromium base H20–H39: tungsten base H40–H59: molybdenum base |
| Plastic mold | P | |
| Special purpose | L | Low alloy |
| F | Carbon tungsten |
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“Envy and jealousy are the private parts of the human soul. Perhaps the comparison can be extended.”
—Friedrich Nietzsche (1844–1900)
“It is comparison than makes people miserable.”
—Chinese proverb.
“We teach boys to be such men as we are. We do not teach them to aspire to be all they can. We do not give them a training as if we believed in their noble nature. We scarce educate their bodies. We do not train the eye and the hand. We exercise their understandings to the apprehension and comparison of some facts, to a skill in numbers, in words; we aim to make accountants, attorneys, engineers; but not to make able, earnest, great- hearted men.”
—Ralph Waldo Emerson (1803–1882)