Specifying EN materials 6

[UcfSE]

I have a project for a fabricator in the UK. How do you spec materials there?

In the US, I would specify the ASTM's for whatever I want. I have the EN 10025 for properties, but I don't know if there's is another governing spec or if I would specify "EN 10025-2 S355" and that's adequate across the board. I am using S235 and S355 materials, and some grade 4340 material. I will have plates, rolled channels and angles, RHS and custom machined billets (S355 and 4340). The billets are different size rectangular and round billets that get machined to a final shape.

I would like input from an engineer's perspective please. We will also be asking the fabricator.

 

[kingnero]

it's specced for instance, EN10025-4 S355J2+N
I believe part 1 (EN10025-1) explains in detail about how to spec/to use the different denominations.

 

[Ussuri]

EN 10025 tells you what you need to specify the correct grade of steel. In the UK version (BS EN 10025-2) the relevant clause is 4.2. Generally speaking you would have the grade, the required impact energy and the delivery condition. So Typically you may have "S355J2+N in accordance with BS EN 10025".

Clause 5 also gives the requirements for "Information to be supplied by Purchaser".

The EN referenced only specifies the grade of steel, so you need to specify the section sizes, geometry or any other requirements separately. The section sizes and geometric properties are specified in a different code.

I am not aware of grade 4340 but I don't think it is to EN 10025, at least it doesn't ring any bells.

 

[desertfox]

hi UcfSE

This link should also help:-

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

 

[UcfSE]

Is any preference given to specifying the steel number instead of the steel name?

So for a hot-rolled tube, would I spec EN 10210 S355JRH, for example?

 

[Ussuri]

For structural purposes I cant remember ever using or seeing steel grades specified by Steel Number.

And for the tubular to EN 10210 then you have specified it correctly.

 

[UcfSE]

Thank you. Would you have any advice on spec'ing a block of 4340? I'll be asking the fabricator what they can get within reason, but I'd like an engineer's take on it too. I'm having a hard time figuring out what I would do in the US for a block of this material. Any advice is appreciated. It's for a machine (amusement ride) part.

 

[CoryPad]

For 4340 steel, you could use one of several ASTM standards. Take a look at this list:

http://www.astm.org/COMMIT/SUBCOMMIT/A0115.htm

You could try a EuroNorm equivalent, see thread14-146795.

 

[UcfSE]

Thank you Cory. Where do you get minimums for 4340, minimum yield and tensile? I'm noticing that isn't as easy to find. How is this normally handled? Do you specify what you need and the fabricator has tests performed to show they achieved the correct value? I'm used to using something like A36 in which the ASTM spec also provides yield and tensile strengths.

 

[CoryPad]

Alloy steels like 4340 are heat treated to final properties. Some standards for 4340, like those in the aerospace industry, will list the mechanical properties. For other industries, it is typical for the end user to create a materials specification or just list requirements on the part drawing.

 

[FennLane]

4340 is equivalent to 817M40 and you can order in a hardened and tempered condition as 817M40T.

Quenched and Tempered materials are specified in BS EN 10083-3:2006

Another route to obtaining direct equivalents for the majority of steels is to find the Werkstoff Nummer (Material Number)of the US based alloy and then find its direct European Equivalent.

For example the Werkstoff Nr. for 4340 is 1.6565

There are many web based guides to International Cross References but the most reliable and one that I have used all my working life is Stahlschlüssel.

http://www.keytosteel.com/en/products/cd-rom/content.aspx

Costly but excellent.


If you are completely stuck then this maybe a place to start:

http://keytometals.com/page.aspx?ID=CheckArticle&site=kts&NM=319

 

[gruntguru]

A nice concise cross-reference.
Link

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