how to measure the hardness of a rod with small diameter??
how to measure the hardness of a rod with small diameter??
(OP)
I have a rod with a diameter of 3.2mm and I want to measure the hardness...could any one please help me
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how to measure the hardness of a rod with small diameter??
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RE: how to measure the hardness of a rod with small diameter??
The standards that control the Rockwell hardness scales, I forget what they are, allow for testing on round material, with a multiplier. You could also mount/polish and do micro-hardness. I've heard of a vickers/knoop macro hardness machine, but I've never seen one.
Brinnell is definitely out.
Nick
RE: how to measure the hardness of a rod with small diameter??
Aaron Tanzer
www.lehightesting.com
RE: how to measure the hardness of a rod with small diameter??
http://www.mcmaster.com/#hardness-tester-files/=jf...
RE: how to measure the hardness of a rod with small diameter??
For accurate values you should section, mount, polish and do either superficial Rockwell or low load Vickers (or Knoop) or microhardness.
This is big wire, lots of options.
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Plymouth Tube
RE: how to measure the hardness of a rod with small diameter??
Hey, I've had a lot of people tell doing the reverse is an acceptable way of determining the tensile strength; so why not?
rp
RE: how to measure the hardness of a rod with small diameter??
Regarding redpicker's suggestion to pull a tensile: I generally find much more variability between tensile and measured Rockwell hardness than I do using microhardness techniques. Both conversions are considered estimates but microhardness is more accurate. Also, tensile conversions only apply to steel (you never mentioned the rod material). They are listed in ASTM A370.
Aaron Tanzer
www.lehightesting.com
RE: how to measure the hardness of a rod with small diameter??
In that case forget hardness and just pull a tensile.
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Plymouth Tube
RE: how to measure the hardness of a rod with small diameter??