Am I blackening steel correctly?

[Dave HalfordParticipant @davehalford22513]

I have some old 1935 C section steel used for telecoms racking some parts cut / drill well and some spots are hard.

So mixed scrap in steel is nothing new.

I remember old 60's/70's jap cars rusting rather badly.

[Nick HulmeParticipant @nickhulme30114]

Don't type your post here!

Posted by vintagengineer on 02/01/2017 19:52:35:Any mild steel containing ANY recycled steel will not meet any standard steel specification

Type below your quoted text to avoid your text being displayed by the system as part of what you're quoting.

😀

[Neil WyattModerator @neilwyatt]

Or click on the top line then mouse click on the red arrow to insert a plain text line before the quote.

Posted by Nick Hulme on 02/01/2017 21:47:53:

Don't type your post here!

Posted by vintagengineer on 02/01/2017 19:52:35:Any mild steel containing ANY recycled steel will not meet any standard steel specification

Type below your quoted text to avoid your text being displayed by the system as part of what you're quoting.

😀

[vintagengineerParticipant @vintagengineer]

Thank you for your polite response.

Posted by Neil Wyatt on 02/01/2017 22:30:01:

Or click on the top line then mouse click on the red arrow to insert a plain text line before the quote.

Posted by Nick Hulme on 02/01/2017 21:47:53:

Don't type your post here!

Posted by vintagengineer on 02/01/2017 19:52:35:Any mild steel containing ANY recycled steel will not meet any standard steel specification

Type below your quoted text to avoid your text being displayed by the system as part of what you're quoting.

😀

[Neil LickfoldParticipant @neillickfold44316]

There is a hot process that takes place at about 140deg C, you can buy the stuff from heat treatment supply companies. It has caustic soda in it, and other salts. I consider it safe to use if you take the appropriate precautions.

They will also give you the instructions for it's proper use. It does not work on stainless steels or steels with a high chrome content. But us great for MS or heat treated A2 tool steel and P20 that I know of, does not effect a steels temper as the 140C is below the steels tempering range.

Neil

[AjohnwParticipant @ajohnw51620]

Posted by Dave Halford on 02/01/2017 20:32:52:

I have some old 1935 C section steel used for telecoms racking some parts cut / drill well and some spots are hard.

So mixed scrap in steel is nothing new.

I remember old 60's/70's jap cars rusting rather badly.

60's 70's ? There were hardly any around then. There were a few about in the 80's but serious numbers came later. That's when they had steel supply limitations. Also near the start of oil technology getting well ahead of car engines and as far as the manufacturers were concerned lasting far to long.

There was a lot of crap mild steel around during wwII. My father told me that they had a name for it in toolrooms – park railings. As they were collecting them and resmelting them. There can still be crap pieces of steel about but sorry I don't think that has anything to do with recycling the stuff.

John

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John

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[Michael GilliganParticipant @michaelgilligan61133]

I'm surprised no-one has mentioned the FIAT story [myth?] discussed here: **LINK**

http://message.snopes.com/showthread.php?t=30479

See post #13 if you can't be bothered reading the whole page.

MichaelG.

[PaulRParticipant @paulr]

Off topic to the OP but on topic as far as recycled steel goes…

The most free cutting mild steel I've ever used came from some 're-purposed' plastic coated rods from a 1990s vintage clothes airer (and I still have about half a dozen 3ft lengths)!

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