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4140 pre-hard spark test
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  6. sucker rod spark test (4130)
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4140 pre-hard spark test

By evfreek

This image is a little blurry probably due to camera shake while taking it, but I will post it anyway. It is from a spark test of a 4130 pre-hard drop from Speedy Metals. Note the higher carbon content than the sucker rod photo, as well as some signs of molybdenum arrows, though not as evident as the diagrams (not photos) in BP0020.

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