Understanding Euronorm designation scheme 2

[bobleon]

Hello

First post here. I know that there have been a lot of questions posted about steel comparisons and equivalencies.

This post is in that neighborhood, but is more about the underlying steel classification scheme of the European standards agency that created the EN specs (ie the so called CEN).

Apparently, they have two documents that speak to this. These documents are numbered EN 10027-1 and EN 10027-2. As I understand it, the first is more of a text based description scheme and the second more of a purely numeric classification scheme.

My question is two fold. First, (short of obtaining these documents)is there info available *about* these two documents (or rather the about the schemes used therein)? I am not referring to copyrighted copies/info, but rather (starter) descriptions of the classification concepts contained in these documents.

Second, (failing that) what about obtaining these documents or access to them? Is it best to just buy them? (best price I've seen is about $125.00 each) or can access be obtained via a subscription to a metals database such as (StahlSchlussel) Key-to-Metals.com?

Bobleon

 

[TVP]

I am not aware of anything in the public domain that describes these two standards and their content. I did a brief google search and didn't find anything, but it was by no means comprehensive.

The short answer is yes, it is best to obtain them if you really need to understand the contents. If you plan to specify materials according to the EN system, or if you need to cross-reference steels frequently, then it may be useful to obtain them. I can tell you that I do not frequently refer to these standards, and I use EN standards almost on a daily basis. The reason I do not reference EN 10027 is because I use the exact product standards (EN 10263-2, 10083-3, EN 10149-2, etc.) which shows the various grades, chemical compositions, etc. Having said that, I just looked through both 10027-1 and -2 and certainly learned something by reviewing their contents.

There is a little bit of useful information on page 12 of the .pdf file linked below. It describes the old DIN standard designation system, but many of the principles still apply to EN standards. C 35 means a plain C steel with nominally 0.35% C by mass, and 36CrNiMo4 can be decoded using this info as well.

http://www.metalkej.com.mk/old_site/makedonski/teh_podatoci/tehpod.pdf

 

[bobleon]

Thanks TVP. I do not specify materials only need to interpret them (for stamping and heat treating them). Part of the problem is that we only do this occasionally.

However, (thankfully) the weak US dollar seems to be increasing that frequency! (I'm in Michigan)

I know that European NUMBERING schemes try to tend to attach particular significance to digit sequence (this is quite true in electronic sensor specs and electronic resistors for example). This can allow one (who knows the digits scheme) to get in the ball park.

The site below has some good info on the digit significance

http://www.roymech.co.uk/Useful_Tables/Matter/Steel_Europe.html#10027

I was hoping for more of the same in order to be able to interpolate approximately what materials were coming at me (for quoting purposes. )

In particular I am unclear on the 4 digit NAMING (not numbering) codes (in EN 10027-1) significance.

For example the FIRST digit (based on end use) for stampings is usually a 'D' like as in DC01 or DC04. I get that. However, I don't know how to interpret what the other (trailing) 3 digits mean. That must be public domain..no?

Bobleon

 

[CoryPad]

That must be public domain..no?

No.

$250 for two definitive documents is a tiny price for conducting global commerce.

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[TVP]

Roy has a nice website, but it obviously does not completely explain all of the intracacies of the EN steel designation system. Table of DIN EN 10027-1 shows the nomenclature system for "flat products for cold forming".

Letter --> D = flat products for cold forming

Mechanical property--> Cnn, where C = cold rolled and nn is used to characterize the steel. Dnn, where D = hot rolled. Xnn, where X = no specification for rolled condition.

Examples are DC01 for cold rolled steels (appears in DIN EN 10130) and DD14 for hot rolled steels (appears in DIN EN 10111).

Stahlschluessel will show the composition for these various steels, and is an excellent tool for cross-referencing.