Surface finish of bright bars

[digger200]

Does anyone know what surface finish to expect on bright bars.

 

[Heckler]

Whatever surface you called out on the drawing! If you didn't call out anything then you're at the mercy of the machinist.

Heckler
Sr. Mechanical Engineer
SWx 2007 SP 3.0 & Pro/E 2001
XP Pro SP2.0 P4 3.6 GHz, 1GB RAM
NVIDIA Quadro FX 1400
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_`\(,_
(_)/ (_)

"First they ignore you, then they ridicule you, then they fight you, then you win." - Mahatma Gandhi

 

[IRstuff]

see:

http://www.ptonline.com/articles/200403fa3.html

TTFN

FAQ731-376

 

[digger200]

Thanks guys but I mean bright bar as from a stockist.

 

[IRstuff]

Why not ask them?

TTFN

FAQ731-376

 

[Heckler]

It depends on the material and the supplier. If your plan is to use the as drawn diameter with no processing then you might want to look into centerless grinding to get a better surface finish. We use some stainless steel rod where the OD is not critical but the appearance is so we get it centerless ground to get the surface finish

Heckler
Sr. Mechanical Engineer
SWx 2007 SP 3.0 & Pro/E 2001
XP Pro SP2.0 P4 3.6 GHz, 1GB RAM
NVIDIA Quadro FX 1400
o
_`\(,_
(_)/ (_)

"First they ignore you, then they ridicule you, then they fight you, then you win." - Mahatma Gandhi

 

[kenvlach]

Bright bar is synonymous with cold-finished.
ASTM A108, 'Standard Specification for STEEL BAR, Carbon and Alloy, Cold-Finished,' gives a little information.

http://www.astm.org/cgi-bin/SoftCar...astm.org/DATABASE.CART/REDLINE_PAGES/A108.htm

Rather qualitative, e.g.:
"5.5.1 Rounds:
5.5.1.1 Cold drawn.
5.5.1.2 Cold drawn, turned, and polished.
5.5.1.3 Cold drawn, ground, and polished.
5.5.1.4 Cold drawn, turned, ground, and polished.
5.5.1.5 Hot wrought, turned, and polished..."

The purchase order must specify the condition and whether any of the Supplementary Requirements S1 - S9 apply.

One supplier you can ask:

http://www.gerdauameristeel.com/products/cds/index.cfm