How does sae number steel

The SAE system uses a basic four-digit system to designate the chemical composition of carbon and alloy steels. The simplest system for designation of steel is schematically shown in Figure 1. It is worth noting however, that there are also certain types of alloy steels that are designated by five digits 51XXX; 52XXX. The first digit 1 , of this designation indicates a carbon steel; i.

Thus the plain carbon steels are comprised within the 10xx series containing 1. The SAE-AISI system then classifies all other alloy steels using the same four digit index as follows: 2 — Nickel steels; 3 — Nickel-chromium steels; 4 — Molybdenum steels; 5 — Chromium steels; 6 — Chromium-vanadium steels; 7 — Tungsten-chromium steels; 9 — Silicon-manganese steels.

Carbon steels and alloy steels are designated by a four digit number, where the first digit indicates the main alloying element s , the second digit indicates the secondary alloying element s , and the last two digits indicate the amount of carbon, in hundredths of a percent by weight.

For example, a steel is a plain-carbon steel containing 0. An "H" suffix can be added to any designation to denote hardenability is a major requirement. Enter a phrase to search for:.

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