Identifying metal by spark testing is common knowledge. The sparks are like the tail of a comet and machining and welding text books have nice color pictures showing the colors and patterns generated by grinding various metals.
--- In atlas_craftsman@yahoogroups.com, Jacjie <irene4pops@...> wrote:
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> Great stuff, Doc. Must have taken a lifetime to learn.
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> --- On Mon, 6/18/12, Doc <n8as1@...> wrote:
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> From: Doc <n8as1@...>
> Subject: Re: [atlas_craftsman].. M HOY.. steels by SPARK TEST
> To: atlas_craftsman@yahoogroups.com
> Date: Monday, June 18, 2012, 4:47 PM
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> > . When you come across scrap it would be nice to know
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> > what you are looking at.
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> -----Original Message-----
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> To: atlas_craftsman <atlas_craftsman@yahoogroups.com>
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> Sent: Sun, Jun 17, 2012 6:10 pm
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> Subject: Re: [atlas_craftsman] C
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> On Jun 17, 2012, at 6:51 PM, ML_Woy wrote:
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> > Now can someone tell me how to tell the difference between Cold Rolled Steel
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> > and Hot Rolled Steel?. When you come across scrap it would be nice to know
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> > what you are looking at
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> here is my way :
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> a spark test is the simple test for scrounged steel , sparking it on a grinding wheel ( moderate push on wheel)
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> ......rule one- .always take a sharp file to unknown steel before destroying a hacksaw blade or a cutter ...think abt why i made that rule ...
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> lo , med & high carbon ----..high carbon has white /light yellow streaks w/ carbon star bursts at the ends EVERY WHERE ...moderate bursts for 1045 or so & scanty bursts for 1020 .....shove a file against the stone in dull light & remember what you see ,.high carbon,-.abt 1% +/-..(W-1) ....do same w/ known cold rolled 1020 & note the difference ...1045 is between the two ....oil hardenening steel ....... 0-1 has alloys & wants to hide the bursts...... you need to spark some known 0-1 drill rod ......other alloy steels have orangish yellow streaks w/ few carbon bursts ...again spark some 4140 & mark it for when you forget what it looks like ( do that for the others you sparked)..hi speed M2 has long orange streaks w/out the bursts .... spark your high speed lathe bits ,& remember .......sharp file on dead soft steel is easy to tell...... as is glass hard....w/ some
> practice you can estimate 1/2 hard ( spring steel , tempered at abt 550 -575 F.....take a file to strapping steel or a flat spring & remember how it bites....
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> steel rod better finished than cold rolled is a good chance to be 1045 steel shafting ...if polished up more , a good chance it is HARDENED shafting if you have THIS stuff , throw it in your roaring fireplace next winter & leave it there in the ashes to cool down all nite ....
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> rear axles are tough steel but usually machineable ...slightly .bent ones are scrap form autio repair places...w/ hi speed bits , around 45 SFM speeds on the ones i have had. years ago ..
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> i expect this can be refined for different alloys & different high speed steels , but this has served me adeqautely for abt 50 yrs
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> hope this helps
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> best wishes
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> doc
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