Hardness For SS-304
Hardness For SS-304
(OP)
Good morning,
There is one incident happened in our site that 2" fuel gas line (ss304) get fired due to excess temperature than allowed and need to check the integrity/micro structure change of the material through hardness.
From where can i get the brinel hardness reading for SS304?
What is the acceptable criteria for the hardness reading.
how much it can be plus/minus?
Hope any of you guys are expert in this can help to get an instant solution.
There is one incident happened in our site that 2" fuel gas line (ss304) get fired due to excess temperature than allowed and need to check the integrity/micro structure change of the material through hardness.
From where can i get the brinel hardness reading for SS304?
What is the acceptable criteria for the hardness reading.
how much it can be plus/minus?
Hope any of you guys are expert in this can help to get an instant solution.





RE: Hardness For SS-304
You can check the hardness and if it is above 22HRC then need to explore more on acceptable range otherwise it should be fine.
I think hardness testing only should not be used to judge on the fitness of the material and it may have undergone microstructural change and the same should be checked.
RE: Hardness For SS-304
RE: Hardness For SS-304
And given that the min yield strength is only 30ksi I have seen material down at 62RB that easily passes the required strength.
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P.E. Metallurgy, Plymouth Tube
RE: Hardness For SS-304
RE: Hardness For SS-304
Visual inspection and surface NDT was already done and found accepted.From the above conversation,I am understanding that there wont be any additional testing required..
RE: Hardness For SS-304
So, TL,DR, the mechanical strength of the material will not be affected but the corrosion resistance could be depending on temperature. NDE is not going to tell you it it is.