I would like to know what does the "D" means in steel grade 16MND5.
According to the standard EN 10027:
16 means 0.16 % C MN 5 means 1.25 % Mn (5 must be divided by 4 to get the Mn mass fraction)
But nothing is specified for D.
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$\begingroup$ I think it follows the French AFNOR standard, not EN according to p30 here publikationen.bibliothek.kit.edu/270046849/3813880 . $\endgroup$– user1318499Commented Jan 22, 2019 at 13:45
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1$\begingroup$ The "Internationaler Stahlvergleich" suggests that D is used in Chinese/Russian steel names. For example, 16MnDR is equivalent to Material No. 1.0570. The closest ISO code I could find to 16MnD5 was 16MnCr5 (material no. 1.7131). $\endgroup$– Biswajit BanerjeeCommented Jan 22, 2019 at 22:14
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$\begingroup$ ccsteels.com/Structural_steel/2305.html is a datasheet from a chinese company. could D mean Mo? $\endgroup$– martCommented Jul 1, 2021 at 20:38
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2 Answers
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This (Table 1, page 4) gives the composition of 16MND5-A508 as
> C S P Mn Si Ni Cr Mo V Cu Co Al N
> 0.159 0.008 0.005 1.37 0.24 0.7 0.17 0.5 <0.1
> Weight % - iron balance.
A508 is the relevant ASTM standards document (not a free publication.)
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1$\begingroup$ It is not ASTM A508 unless is is marked and certified as A508. $\endgroup$ Commented Oct 19, 2019 at 21:35
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$\begingroup$ Apparently forging stock likely to be used with ASTM A302, " carbon - 1/2 Mo" . Common pressure vessel steel for use at high temperatures , probably in hydrogen service ( reformers). $\endgroup$ Commented Oct 29, 2021 at 14:40
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Having looked at the link,
D is for Flat products for cold forming, and is usually followed by two numbers characterising steel
See https://en.wikipedia.org/wiki/Steel_grades#Category_1
Based on the diagram in the same link:
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$\begingroup$ You refer to naming according to category 1 (Steel specified by purpose of use and mechanical properties). The steel grade 16MND5 belongs to category 2 (Steel specified by chemical composition). The scheme en.wikipedia.org/wiki/File:EN10027-steelgrade-diagram.svg gives more details about the naming specification. According to this scheme, D should be alloy element. But I don't know of any element with element symbol D. $\endgroup$ Commented Jan 22, 2019 at 11:27
