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Hot rolled and pickled

G

gjestico

Member
I have ordered a few things from sendsutsend (USA) in the past, And saw that the hot rolled plate (1/4" and less) they use is "HRPO" . Hot Rolled Pickled Oiled. I have been in the metal trade since dinosaurs roamed the earth but have never encountered this in Canada.
Its nice. Metal is clean, No mill scale at all, almost cold rolled like.
I realize one can do some home brew type stuff to remove mill scale, But i wonder why it doesn't seem to be commonly available in Canada.
 
Online Metals has info, but no products:

IMG_9379.jpeg
 
gjestico said:
I have ordered a few things from sendsutsend (USA) in the past, And saw that the hot rolled plate (1/4" and less) they use is "HRPO" . Hot Rolled Pickled Oiled. I have been in the metal trade since dinosaurs roamed the earth but have never encountered this in Canada.
Its nice. Metal is clean, No mill scale at all, almost cold rolled like.
I realize one can do some home brew type stuff to remove mill scale, But i wonder why it doesn't seem to be commonly available in Canada.
Click to expand...
We’ve ordered it occasionally, at work. Not every supplier carries it, but it’s nice stuff. :)
 
Has anyone tried citric acid for mill scale? I did use the hydrochloric/muriatoc acid with a neutralizing bath after but a bit of a pain.
 
My take on it is, it' very common for stamping - they use, afaik exclusively, P&O. They would typically get it in coil slit to the width they need. You can also get it cut and leveled in sheets(bent back to take out the curve of the coil ). However as virtually all fab work is not P&O and fabricators by sheet (whereas stampers buy slit coils) most sheet I would say is not P&O.

As a fabrication shop, we cringe at P&O..... it'd be like "what are we going to do with this crap" lol .... where as stamper would be the opposite.
 
BldrJ said:
Has anyone tried citric acid for mill scale? I did use the hydrochloric/muriatoc acid with a neutralizing bath after but a bit of a pain.
Click to expand...

I usually just leave it there or I use old/dull tooling to remove it. Sometimes I've used a wire wheel or course sand paper.

In all my life I've never used acid.
 
Never used hrpo, but i can certainly see some benefits to it.

My favourite way to deal with millscale are these discs https://a.co/d/h2SLlYX

Once you get "under" an edge with them the mill scale just peels up. Messy though.....an outside job for sure. They don't last forever, but longer than expected if you don't lean on them and let them work. Leaning on them doesn't speed up anything except their demise.
 
I worked in a wire mill. We used hydrochloride acid for wire cleaning and sulfuric acid rod cleaning . It was never called pickling. These were areas I tried to avoid. Chlorine gas from the break down ,does permanent damage to lungs. I had enough of that in pulp mills.
 
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