S235JR steel

[MeunierParticipant @meunier]

Has anyone used this ?

[MeunierParticipant @meunier]

Hi all,

looking to order some steel for beginner projects on mill/lathe and note that Blockenstock only seem to offer S235JR in the bar/strip sizes required.

Lots of info on S235JR on the web, it's a 'drawn mild steel for construction', but unable to relate it to steels I remember. Has anybody used it and can report on its machinability ? Am looking for similar to EN1A(230M07/S250) free-cutting. Blockenstock will post at reasonable cost to my v.rural location and accept Paypal

Thanks. DaveD

[JasonBModerator @jasonb]

That is a hot rolled (black) mild steel. Not the nicest to work as it can be a bit gummy and the mill scale on the surface will tend to wear your tools unless removed by acid dipping before use. OK for a bit of blacksmithing or decorative ironwork but not ideal for a beginner.

Hopefully one of our members living in France can suggest a suitable ME friendly supplier over there

Edited By JasonB on 14/04/2017 20:11:26

[richardandtracyParticipant @richardandtracy]

It's a weldable structural steel. S235 is weaker than anything in the old BS 4360. The weakest that had was grade 43, S235 may have been equivalent to a grade 35. The yield stress is 235 N/mm^2, breaking at 350-ish dependant on thickness.

It is gummy, and machines more like 070M20- not very good. Use it for structures not machining.

Try for EN 10277 steel number 1.0715 also known as 11SMn30. That is the Euronorm version of the steel you want, same name & number throughout Europe, even the UK. The number is the German number, the name is the French one. The UK numbers have been lost along the way. For a small comparator look here: http://www.parkersteel.co.uk/Matrix/56/Bright+Round+Metric

Regards

Richard

Edited By richardandtracy on 14/04/2017 20:34:26

[Benny AvelinParticipant @bennyavelin86238]

I use 235 and 355 quite regularly as It is easy to find and very cheap. I usually pickle in vinegar before machining to save the tools. Turning or milling with cutting oil it machines quite nicely and you can achieve a very good surface finish on it. The strength is not too big of an issue except it dings quite easily. In short, I like it.

[MeunierParticipant @meunier]

Thanks for the comments and the info, a friend mentioned a fairly local stockist to check out; will give them a try first.

DaveD

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