Yield Strength from Hardness Test
Yield Strength from Hardness Test
(OP)
Is there a specified method for determining a materials yield strength and tensile strength from a hardness test?
This material is in the field and I do not have any MTR's on it.
Thank you.
This material is in the field and I do not have any MTR's on it.
Thank you.





RE: Yield Strength from Hardness Test
RE: Yield Strength from Hardness Test
RE: Yield Strength from Hardness Test
My old college metallurgy text has a table showing hardness numbers related to tensile stress, which I assume to be ultimate. The table describes the relations as approximate, and it states that everything is for steel.
--
JHG
RE: Yield Strength from Hardness Test
RE: Yield Strength from Hardness Test
A.
RE: Yield Strength from Hardness Test
RE: Yield Strength from Hardness Test
If you don't know the materials denomination or are not sure provide PMI positive material identification (by a handheld device)for the chemical composition.
Hardness test: can indicate the tensile strength
--> metallurgist or metlab could give you a more specific answer to a possible YS range for the US found
but there are at least 2 variables:
surface hardening
heat treatment (esp. for mechanical parts from steel)
In case of a safety relevant part I'd try to find a stocked spare & have it tested and then re-manufactured asap.
RE: Yield Strength from Hardness Test
(Didn't see it in the Index, but there are hardness references for face hardness welding.)
RE: Yield Strength from Hardness Test
RE: Yield Strength from Hardness Test
In these cases, your only real option is to assume some basic level of "nominal" strength base don year of manufacture, essentially A106 for pipe and Grade B for pipelines.
I can't think of a single reason for anyone in authority to sign this off based on a couple of hardness tests.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Yield Strength from Hardness Test
Since you have an undetermined material in the field and it is currently in use, I assume, you will need to perform a chemical check first. Hardness testing and the chemical check will only provide limited information to determine potential material grade/specification.
Is the material pipe or plate or forging or casting or structural shape? Material type will provide further limiting information.