NITRONIC 50 (XM-19) MAX ACCEPTABLE HARDNESS
NITRONIC 50 (XM-19) MAX ACCEPTABLE HARDNESS
(OP)
I need to approve a WPS for UNS S20910 Hot Rolled Material (also named Nitronic 50/XM-19). I found maximum hardness values in the base material zone up to 363 HV.
NACE said "However, S20910 is acceptable in the annealed or hot-rolled (hot/cold-worked) condition at a maximum hardness of 35 HRC"
NACE also said "Individual HRC readings exceeding the value
permitted by this part of ISO 15156 may be considered acceptable if the average of several readings taken
within close proximity does not exceed the value permitted by this part of ISO 15156 and no individual reading
is greater than 2 HRC above the specified value"
37 HRC corrospond exactly to 363 HV10, but my problem is that 5 hardness point exceed 35 HRC.
Is this WPS technically acceptable or we need to requalified the procedure.
NACE said "However, S20910 is acceptable in the annealed or hot-rolled (hot/cold-worked) condition at a maximum hardness of 35 HRC"
NACE also said "Individual HRC readings exceeding the value
permitted by this part of ISO 15156 may be considered acceptable if the average of several readings taken
within close proximity does not exceed the value permitted by this part of ISO 15156 and no individual reading
is greater than 2 HRC above the specified value"
37 HRC corrospond exactly to 363 HV10, but my problem is that 5 hardness point exceed 35 HRC.
Is this WPS technically acceptable or we need to requalified the procedure.





RE: NITRONIC 50 (XM-19) MAX ACCEPTABLE HARDNESS
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: NITRONIC 50 (XM-19) MAX ACCEPTABLE HARDNESS
According to this, anybody knows which is the good practicse maximum acceptable hardness values for this kind of material?
Thanks in advance for your suggestions.
RE: NITRONIC 50 (XM-19) MAX ACCEPTABLE HARDNESS
and is S20910 not an austenitic stainless steel?
Which specific standard is designating the hardness requirements for the weld that you are attempting to qualify, or are you hardness testing simply because you think it is a good idea?
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: NITRONIC 50 (XM-19) MAX ACCEPTABLE HARDNESS
We need to follow the M-601 standard where the hardness test is explicitly required, but no indication are given about the maximum allowable hardness.
So I need a common standard or a good practice as reference where I can find a reasonable values of hardness to refer to. I read the above values in the WPS but I don't know if I have to accept or not.
Is possible to take as reference the NACE standard also if I haven't a Sour Service condition? At the moment is the only standard which I found, that speaks directly about this particular material.
RE: NITRONIC 50 (XM-19) MAX ACCEPTABLE HARDNESS
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: NITRONIC 50 (XM-19) MAX ACCEPTABLE HARDNESS
So no maximum hardness limit shall be applicable.
I really appreciated your answer.