SAE 1144 Stressproof

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SAE 1144 Stressproof

This topic has 10 replies, 7 voices, and was last updated 22 March 2022 at 20:19 by old mart.

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21 March 2022 at 22:01 #30213
Stumpy
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@stumpy85023
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21 March 2022 at 22:01 #591006
Stumpy
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@stumpy85023
Can somebody help me cross reference SAE 1144 Stressproof to a BS number. A stab in the dark puts me at EN9.

The people in the USA seem to like this steel for making crank shafts. I can understand why from what I can read up the steel is very stable even after heavy removal.

I need to make a crank for a USA model that is calling for SAE 1144 and would like to get something as close as posable to this spec to avoid the normal pit falls.

Said crank will be made from 50mm/2" sold and 250mm/10".

Cost is not the problem I'm just very unsure of my specs.
22 March 2022 at 01:52 #591022
Hopper
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@hopper
No idea of EN standards but shipping cost from the US of a small piece might be worthwhile.
22 March 2022 at 07:20 #591030
JasonB
Moderator
@jasonb
From previous discussions about it I don't think there is am equivalent available in the UK.

I tend to use EN8 and if making a flat crank from round take a bit off one side, flip it over and a bit off the other and so on. Leave it 1mm or so oversize and let it sit for a week or two before final machining.
22 March 2022 at 08:03 #591036
Thor 🇳🇴
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@thor
Doesn't the SAE 1144 steel have a bit more Manganese than EN8/9 and around 0.2% Sulphur so it is free-cutting? Similar to what we call 44SMn28.

Thor
22 March 2022 at 08:08 #591037
DC31k
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@dc31k
See:

https://equivalentmaterials.com/materials/sae-1144
22 March 2022 at 08:12 #591039
JasonB
Moderator
@jasonb
Basic 1144 cold drawn is not the same as 1144 Stressproof which has been stress relieved though composition is the same.

That is why it is liked for crankshafts as it does bot go banarnna shaped when you cut more off one side than the othe

Edited By JasonB on 22/03/2022 08:13:32
22 March 2022 at 09:22 #591051
Circlip
Participant
@circlip
In the golden era "Take a piece of half shaft". Ahhh, those were the days.

Regards Ian.
22 March 2022 at 19:43 #591151
Stumpy
Participant
@stumpy85023
Thank you all.

It seem this has been spoken about before and every body has found all the same results as me. Or should I say they have not found a replacement with in the UK.

US Shipping right now is just a joke for every £20 spent shipping is about £50 and as of right now I have 2 lost fly wheels in there system. The second one being the replacement for the first one. So my trust right now is a tad low.

EN8 was my last pick from my racing days we use to make every thing from EN16 old habits and all that. But I think having ago with EN8, EN9 and EN16 just to see how each one moves over time could be fun as most of the work will be CNC any way.
22 March 2022 at 19:54 #591152
JasonB
Moderator
@jasonb
If you get black EN8 it's less likely to move than bright. I've used this guy on e-bay a few times.

What is the engine?

Postage from the US is certainly not cheap going by what I have paid for US made casting sets

Edited By JasonB on 22/03/2022 19:57:47
22 March 2022 at 20:19 #591158
old mart
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@oldmart
At work, we stress relieved steel part machined aircraft parts at 190C for 3 hours, in a fan oven, cooling naturally in air.

Edited By old mart on 22/03/2022 20:20:00
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