San mai by hand

[Tyshoots]

So, this is something that bothered me for a while because I've seen you reference it a few times, and being that we consume about 2000 tons of A36 a year at work I thought it was a bit ridiculous, but...

This is some Grade 70 ASTM certified plate, that bolts either fell out of the roll mill or some other equipment and rode the plate through the rollers. They weren't forge welded in, but instead just imprinted the material. I could see how if this plate was drawn down further yet, something like the above could happen.

I know it's an old thread but I thought this a relevant update to have some photographic proof of heat tracked, certified plate with something similar to what was described.

A36 is not "36 different types of steel in a pot" or "made from nuts and bolts" or whatever nonsense, but now I have an example of how someone might be lead to believe it is.

Dang..... I've seen stuff like that on A1018 or A656 coming off of a coil line but not on grade 70! What thickness was it?

 

[kuraki]

Dang..... I've seen stuff like that on A1018 or A656 coming off of a coil line but not on grade 70! What thickness was it?

1.5"

 

[Kentucky]

A few years back, Ed Caffrey told me that he stopped using A36 for fittings, etc because he etched a piece and could actually see the faint shadow of a machine screw.

I remember him telling that story once. Said it was plain as day. I will say that I've had a few pieces(I mean an entire 20' bar) of A36 over the years that would not weld to itself and I say this in modesty but ive forge welded a lot. I mean thousands of times so I know when something is off. Not saying it's something inherently wrong with a36 but I remember it happening a few times over the years.