Tempering issue - - Pipe Size 4”, Sch-120, ASTM A 335 Gr P5

[Prashanth Markonda]

As per ASTM A 335 Gr P5 min tempering temperature is 675deg.C.
Vendor submitted Material Test Certificate with tempering carried out at 750 deg.C.

Fluid service - Hot slurry at 300 deg.C

Would like to know if the material being proposed by vendor is acceptable or not ?

 

[weldstan]

The temper prvided is not so atypical for P5. however, it may produce a hardness that will be detrimental to your pipes\'s longterm life in your slurry service.

What were the mechanical properties stated on the MTR and did you ask for a minimum hardness?

 

[MagBen]

I would take 750C as the max temp. Time matters too. If it was 1 hour, for OD 4'' pipe is fine. if 4hour or longer, you may need to worry about the extra carbides that can decrease impact, and strength. b.t.w, a min of 675C is to get rid of any possible martensite.