1021M vs 1022

[henschen]

For a fastener, is there an advantage to using 1021M or 1022 steel, or are they basically the same material? What does the 'M' suffix signify?

 

[CoryPad]

According to SAE J403 Chemical Compositions of SAE Carbon Steels, the only difference between 1021 and 1022 is Mn concentration:
[tt]
Alloy Mn conc (mass percent)
----- ----------------------
1021 0.60 to 0.90
1022 0.70 to 1.00
[/tt]

I assume the M means "modified", though that is by no means certain.

It is almost certain that either alloy will provide the same basic properties for a fastener.

Regards,

Cory

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