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Example AISI/SAE No. 1020: AISI/SAE Steel Numbers Are Indicated Below. (AISI-American Iron and Steel Institute)

The document discusses AISI/SAE steel numbering systems, providing examples of numbers like 1020 and 4340 and explaining what each digit represents. It then lists various steel alloy types and their typical compositions according to their AISI/SAE number ranges.

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Sai Chandrasekhar
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224 views3 pages

Example AISI/SAE No. 1020: AISI/SAE Steel Numbers Are Indicated Below. (AISI-American Iron and Steel Institute)

The document discusses AISI/SAE steel numbering systems, providing examples of numbers like 1020 and 4340 and explaining what each digit represents. It then lists various steel alloy types and their typical compositions according to their AISI/SAE number ranges.

Uploaded by

Sai Chandrasekhar
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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AISI/SAE steel numbers are indicated below.

(AISI- American iron and steel institute)

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

10XX Plain carbon, Mn 1.00% max

11XX Resulfurized free machining


Carbon steels
12XX Resulfurized / rephosphorized free machining

15XX Plain carbon, Mn 1.00-1.65%

13XX Manganese steel Mn 1.75%

23XX Ni 3.50%
Nickel steels
25XX Ni 5.00%

31XX Ni 1.25%, Cr 0.65-0.80%

32XX Ni 1.75%, Cr 1.07%


Nickel-chromium steels
33XX Ni 3.50%, Cr 1.50-1.57%

34XX Ni 3.00%, Cr 0.77%

40XX Molybdenum steels Mo 0.20-0.25%


44XX Mo 0.40-0.52%

41XX Chromium-molybdenum steels Cr 0.50-0.95%, Mo 0.12-0.30%

43XX Ni 1.82%, Cr 0.50-0.80%, Mo 0.25%


Nickel-chromium-molybdenum steels
47XX Ni 1.05%, Cr 0.45%, Mo 0.20-0.35%

46XX Ni 0.85-1.82%, Mo 0.20-0.25%


Nickel-molybdenum steels
48XX Ni 3.50%, Mo 0.25%

50XX Cr 0.27-0.65%

51XX Cr 0.80-1.05%

50XXX Chromium steels Cr 0.50%, C 1.00% min

51XXX Cr 1.02%, C 1.00% min

52XXX Cr 1.45%, C 1.00% min

61XX Chromium-vanadium steels Cr 0.60-0.95%, V 0.10-0.15%

72XX Tungsten-chromium steels W 1.75%, Cr 0.75%

81XX Ni .30%, Cr 0.40%, Mo 0.12%

86XX Ni .55%, Cr 0.50%, Mo 0.20%


Nickel-chromium-molybdenum steels
87XX Ni .55%, Cr 0.50%, Mo 0.25%

88XX Ni .55%, Cr 0.50%, Mo 0.35%

92XX Silicon-manganese steels Si 1.40-2.00%, Mn 0.65-0.85%, Cr 0-0.65%


93XX Ni 3.25%, Cr 1.20%, Mo 0.12%

94XX Ni 0.45%, Cr 0.40%, Mo 0.12%


Nickel-chromium-molybdenum steels
97XX Ni 0.55%, Cr 0.20%, Mo 0.20%

98XX Ni 1.00%, Cr 0.80%, Mo 0.25%

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