Mystery material

Mystery material

This topic has 8 replies, 6 voices, and was last updated 1 March 2021 at 10:14 by David Jupp.

Viewing 9 posts - 1 through 9 (of 9 total)

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1 March 2021 at 08:38 #530901
Paul Relf-Davies
Participant
@paulrelf-davies37806
Hi all,

I am shortly to embark on a small project, to remake some components from the 1940s, as part of a larger collaboration.

On the drawing for one of the parts, the specified material is 'Silkase' and the treatment is 'case hardened'.

I have not been able to find any reference to Silkase as a case hardenable material – I assume it to be some form of low carbon steel..?

Does anyone recognise the name? (Google doesn't seem to!!) Is there a modern equivalent?

Many thanks for any information.

Cheers

Paul
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1 March 2021 at 08:38 #30114
Paul Relf-Davies
Participant
@paulrelf-davies37806
1 March 2021 at 08:52 #530903
David Jupp
Participant
@davidjupp51506
The name may (or may not) give a clue. 'Sil…' could refer to Silicon, or maybe to the name of the manufacturer, or something else entirely.

Do you know the original manufacturer? What is the application? Do you have any original parts available?
1 March 2021 at 09:22 #530906
Roderick Jenkins
Participant
@roderickjenkins93242
I went down the silicon steel rabbit hole but ended up with this from Graces Guide:

Looks like Silkase is a free machining case hardenable steel. EN1A would probably be OK but I would avoid leaded steel for case hardening. EN3B won't have such a nice surface finish but may be more reliable, not having the additions for free maching. You can work on the surface finish for a one off.

HTH,

Rod
1 March 2021 at 09:27 #530909
Ady1
Participant
@ady1
Couldn't find a sausage in 200GB of text searching

Had more luck with Flather

Looks like they were sheffield alchemists connected with the bike trade

Edited By Ady1 on 01/03/2021 09:45:28

Edited By Ady1 on 01/03/2021 09:47:47
1 March 2021 at 09:31 #530910
Paul Relf-Davies
Participant
@paulrelf-davies37806
Marvellous!! Thank you so much.

I also went down the Silicon Steel rabbit hole, with similar success!

As to the original part; No, I don't have it, I only have the plan.
1 March 2021 at 09:32 #530911
Michael Gilligan
Participant
@michaelgilligan61133
Well-found, Rod !!

MichaelG.
1 March 2021 at 09:36 #530912
David George 1
Participant
@davidgeorge1
Hi EN 32B may be a nearer match. It has same properties.

David
1 March 2021 at 10:14 #530924
David Jupp
Participant
@davidjupp51506
At least one other steel producer in Sheffield had their own trade names for standard 'EN' steels.

I have a (1950's) handbook from another steel supplier (not Sheffield) – their '…case' product is EN32.
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