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Anonymous Poster

Primery Vs Secondary steel properties.

10/31/2009 4:31 AM

Is there any technical differences in properties (Mechanical or Chemical properties) of TMT bar produced by primery and secondary steel manufacturer.

Primery steel :produced by iron ore.

Seconadary steel :produced by steel/metal scrap.
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Milo
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Join Date: Jul 2006
Location: "Dancing over the abyss."
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#1

Re: Primery Vs Secondary steel properties.

11/01/2009 9:07 AM

primary method results in lower residual element such as copper nickel chrome at low levels. Secondary process has much higher levels of these elements. Because primary method uses basic oxygen furnace, it has lower nitrogen levels than electric furnace melt which is in air. For cold heading and coldeformation i would prefer primary (bof) steel over secondary. No idea what you meant by GMT steel. Please forgive typing,am using my iPod as my computer wireless is not connecting. Milo

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Anonymous Poster
#2
In reply to #1

Re: Primery Vs Secondary steel properties.

11/02/2009 4:04 AM

TMT= Thermo Mechanically Treated. regularly used in buliding constructions.

How you could miss that ?

I am disappointed (You know who )
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Milo
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Join Date: Jul 2006
Location: "Dancing over the abyss."
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#3
In reply to #2

Re: Primery Vs Secondary steel properties.

11/02/2009 10:08 AM

Dear You know who.

It was easy to miss, as I was answering while away at a retreat on the "theology of institutions."

I Am an SBQ guy (Special Bar Quality guy for folks who may simlarly be on retreat somewhere...) And We don't use TMT, we say TMR (thermo mechanical rolling) when we have to.

Usually we just say microalloy. At least in my part of the world...

Given this new insight, i would say that if both sources comply with the microallying agents addition and rolling parameters, and controlled cooling, there should be no significant difference... save that I continue to expect an average higher Tensile and Yield strength achieved because of synergies of Nitrogen as a consequence of electric furnace melt.

Cheers.

milo

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 People say between two opposed opinions the truth lies in the middle. Not at all! Between them lies the problem, what is unseeable,eternally active life, contemplated in repose. Goethe
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