347 H Valve Material ?

[Valveusa]

What is the difference 347H - 347 Valve body material?

 

[redpicker]

347H has higher limits on Carbon (and higher tensile strenght, I believe).

rp

 

[EdStainless]

Actually H has a min on the C, so that it has to be high carbon.
The alloy is slightly stronger, but has significantly higher creep strength.

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Plymouth Tube

 

[metengr]

The 347H has higher creep strength.