Friday, June 3, 2016

AISI/SAE Steel - numbering system

I spend a decent amount of my summer talking to industry folks. Sometimes they're materials engineers, sometimes metallurgists, sometimes polymer engineers, forgers, welders, failure engineers.

No matter what they're titles, they're typically far more knowledgeable about industrial materials than I am. They throw around all sorts of acronyms that I have to take note of and look up later.

Sometimes I save reference materials here just so I can look them up later.

Today's reference material is about the AISI (American Iron and Steel Institute) / SAE (Society of Automotive Engineers) steel numbering system. See, the wikipedia article - while thorough - is a little too thorough for me.

Instead, I like the simplicity of the Engineering Toolbox's reference chart...
10XXCarbon steelsPlain carbon, Mn 1.00% max
11XXResulfurized free machining
12XXResulfurized / rephosphorized free machining
15XXPlain carbon, Mn 1.00-1.65%
13XXManganese steelMn 1.75%
23XXNickel steelsNi 3.50%
25XXNi 5.00%
31XXNickel-chromium steelsNi 1.25%, Cr 0.65-0.80%
32XXNi 1.75%, Cr 1.07%
33XXNi 3.50%, Cr 1.50-1.57%
34XXNi 3.00%, Cr 0.77%
40XXMolybdenum steelsMo 0.20-0.25%
44XXMo 0.40-0.52%
41XXChromium-molybdenum steelsCr 0.50-0.95%, Mo 0.12-0.30%
43XXNickel-chromium-molybdenum steelsNi 1.82%, Cr 0.50-0.80%, Mo 0.25%
47XXNi 1.05%, Cr 0.45%, Mo 0.20-0.35%
46XXNickel-molybdenum steelsNi 0.85-1.82%, Mo 0.20-0.25%
48XXNi 3.50%, Mo 0.25%
50XXChromium steelsCr 0.27-0.65%
51XXCr 0.80-1.05%
50XXXCr 0.50%, C 1.00% min
51XXXCr 1.02%, C 1.00% min
52XXXCr 1.45%, C 1.00% min
61XXChromium-vanadium steelsCr 0.60-0.95%, V 0.10-0.15%
72XXTungsten-chromium steelsW 1.75%, Cr 0.75%
81XXNickel-chromium-molybdenum steelsNi .30%, Cr 0.40%, Mo 0.12%
86XXNi .55%, Cr 0.50%, Mo 0.20%
87XXNi .55%, Cr 0.50%, Mo 0.25%
88XXNi .55%, Cr 0.50%, Mo 0.35%
92XXSilicon-manganese steelsSi 1.40-2.00%, Mn 0.65-0.85%, Cr 0-0.65%
93XXNickel-chromium-molybdenum steelsNi 3.25%, Cr 1.20%, Mo 0.12%
94XXNi 0.45%, Cr 0.40%, Mo 0.12%
97XXNi 0.55%, Cr 0.20%, Mo 0.20%
98XXNi 1.00%, Cr 0.80%, Mo 0.25%

...with its couple of examples:

Example AISI/SAE No. 1020

  • the first digit indicates that this is plain carbon steel.
  • the second digit indicates there are no alloying elements
  • the last two digits indicates that the steel contains approximately 0.20 percent carbon
     

Example AISI/SAE No. 4340

  • the first two digits indicates a Nickel-Chromium-Molybdenum alloy steel
  • the last two digits indicates carbon content roughly 0.4 percent

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