The AISI stopped being involved because it never wrote any of the specifications. 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. Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
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Students Click Here. Related Projects. I am a relatively new engineer and am having some confusion with respect to specifying materials.
Additional letters added between the second and third digits include B when boron is added between 0. The prefix M is used to designate merchant quality steel the least restrictive quality descriptor for hot-rolled steel bars used in noncritical parts of structures and machinery. The prefix E electric-furnace steel and the suffix H hardenability requirements are mainly applicable to alloy steels. Skip to content Materials. For Example : SAE indicates non-modified carbon steel containing 0.
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