Steel Grade in Macpherson Strut?

Allan

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I've searched the net but can't find the answer: Any idea what grade of steel is in a Macpherson strut rod? I am guessing 1045 by the way it machines and does not oil harden. 1045 is common for hydraulic cylinder rods and such. Anyone know for sure?
 

Dudemanrod

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Hard to say springs used to be 5160 the rams and rods have to be something with a decent amount of carbon. Try a spark test if you can
 

ddickey

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1045 doesn't oil harden?
 

Allan

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Not that I could I see. Not enough carbon apparently.
 

Illinoyance

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1045 is heat treatable.

Heat to 820°C – 850°C (1508°F – 1562°F)
Hold until the temperature is uniform
Soak for 10 – 15 minutes per 25mm of section
Quench in water or brine

Unfortunately the source I found does not give the maximum hardness that can be achieved.
 

Allan

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OK, I'll try it again. Actually I have since found out that it can be treated as per your instructions but the resulting tool is not very abrasion resistant so doesn't make for a great cutting tool. Think I'll have to lay down some cash for some O-1.
 

MrWhoopee

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OK, I'll try it again. Actually I have since found out that it can be treated as per your instructions but the resulting tool is not very abrasion resistant so doesn't make for a great cutting tool. Think I'll have to lay down some cash for some O-1.
1045 will not harden sufficiently to be used as a cutting tool. Higher carbon content straight carbon steels (like 1060) will get hard enough, but tend to be brittle and will lose their hardness if over-heated. That's why we avoid the cheap carbon steel tools. High-speed steels were developed to overcome these deficiencies.
 

MrCrankyface

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I can't remember what video it was that I looked at, but I believe it was 1045/C45 they were testing to harden/anneal in different ways and then testing with a HRC thing. It did make a difference by maybe 10HRC, not sure how much use that would be in practice.
If I can jog my memory and remember the video I'll post it.
 

rgray

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You might get some cutting use out of it by surface hardening. But if you don't already have that compound I think I'd use the money to buy the O-1.
That also depends on how much work went into making the tool.
 

Allan

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Picked up some O-1 today at a good price. So when I get some other projects finished I'll give it a try.
 
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