4140 drops Delta BC 1.50$ LB

[justin1]

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Good for those small projects

 

[PeterT]

Dang, that's a good price

 

[djberta]

Be a good haul.

 

[Greywynd]

Anyone know how or where to have a sample piece of steel tested to figure the alloy? I suspect that the large diameter stuff I’m bringing home is 4140, or at least a ‘tough’ steel of some sort, but just a guessing game right now.

 

[justin1]

Anyone know how or where to have a sample piece of steel tested to figure the alloy?

Your can try scrap yards see if they have XRF gun and see if they willing to test for you.

Other options are talk to a local not destructive testing company and ask if they have XRF gun. Like acuren or applus but probly aim for small companies as both of those companies would charge you more then the metal is probably worth.

If you can do semi controled heat treating operations just heat treat small piece and see if it lands within target hardness for temps you used and try doing annealing to a specific hardness and see if material agian lands within that range.

Besides that you can make educated guess depending on what the source of material is from. 4140 with mill scale/shaft stock looks the same as it's similar counterparts.

Remembered spark testing is a thing aswell but feel like it's also more or less a guess even comparing sparks with known materials unless it's high carbon vs low carbon then you'll be able to tell guess carbon content anyways

 

[Birkhoff]

Shoot, I just came from there back to the island!

 

[Tom Kitta]

So I offered $2 per lbs in Calgary for 4140 and 4330 for past 5 years. Discounts for larger amounts...