Conversion from Microhardness to Hardness
Conversion from Microhardness to Hardness
(OP)
How to convert microhardness 0.3 kg Vickers to standard Brinell hardness !!
Thanks in advance
Thanks in advance
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
Conversion from Microhardness to Hardness
|
Conversion from Microhardness to HardnessConversion from Microhardness to Hardness(OP)
How to convert microhardness 0.3 kg Vickers to standard Brinell hardness !!
Thanks in advance Red Flag SubmittedThank you for helping keep Eng-Tips Forums free from inappropriate posts. Reply To This ThreadPosting in the Eng-Tips forums is a member-only feature.Click Here to join Eng-Tips and talk with other members! |
ResourcesWhat is rapid injection molding? For engineers working with tight product design timelines, rapid injection molding can be a critical tool for prototyping and testing functional models. Download Now
The world has changed considerably since the 1980s, when CAD first started displacing drafting tables. Download Now
Prototyping has always been a critical part of product development. Download Now
As the cloud is increasingly adopted for product development, questions remain as to just how cloud software tools compare to on-premise solutions. Download Now
|
RE: Conversion from Microhardness to Hardness
If you know the material and HV value, perhaps one of us can convert it for you if you do not have the standard.
RE: Conversion from Microhardness to Hardness
RE: Conversion from Microhardness to Hardness
I think recognition of this limitation is reflected in the fact that while many specs limit hardness of welds and HAZ's in P1 materials to 200 Brinnel, they typically allow a maximum of 248 HV-10.
RE: Conversion from Microhardness to Hardness
"Approximate" key word!
RE: Conversion from Microhardness to Hardness
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
RE: Conversion from Microhardness to Hardness
Please keep in mind that this conversion is only applicable for Steel material as practicle exp. of my.
Drawing requirement should be strictly Microhardness Testing not the BHN. because it will hamper your quality requirement.
RE: Conversion from Microhardness to Hardness
In ASTM E140, there are both tables and conversion equations. We have an issue with our microhardness tester and I was curious if it is because of round off error. For example, 708HV is converted to 60.5HRC by the tester which would round up to 61. When converting by the tables in E140 708HV should be 60.478HRC, which rounds down to 60HRC... on the other hand, the equations would give 60.575HRC and that would clearly round up to 61HRC.
If I had a spec where the limit was 60HRC, would the 708HV pass that spec?
Aidan McAllister
Metallurgical Engineer
Automotive Enthusiast
RE: Conversion from Microhardness to Hardness
Technically, no, if the spec limit was 60HRC, you would be obliged to test the material with a Rockwell 'C' tester to determine conformance. Any conversion is an approximation, so if you tested the material in HV to meet a requriement stated in HRC, at best you could say you approxiamtely meet the requirement (or approxiamtely do not meet the requirement). If all you are trying to do is approximately meet the requirement, then does it really matter if your result is 60 or 61? Both numbers approximately meet the requirement.
rp
RE: Conversion from Microhardness to Hardness
Well said, I gave you a star.
RE: Conversion from Microhardness to Hardness
Aidan McAllister
Metallurgical Engineer
Automotive Enthusiast
RE: Conversion from Microhardness to Hardness
There are thickness and process requirements to consider when specifying a hardness scale or allowable conversion. For example, using your 60HRC number, the stock should be at least .030" thick to use a direct HRC test at that expected hardness. But if your .030" stock was not through hardened but carbonitrided instead, a different hardness scale like an HR15N or file hardness would be more appropriate.
RE: Conversion from Microhardness to Hardness
rp
RE: Conversion from Microhardness to Hardness
Aidan McAllister
Metallurgical Engineer
Automotive Enthusiast