NACE MR0175 for L80 3

[eltooon]

What's the implication of NACE MR0175/ISO 15156 on API L80?

Seems the only requirement is on hardness, max being HRC22 instead of HRC23 as specified in API 5CT?

Any other things I missed out?

 

[blacksmith37]

Looking at the 1999 ed. : Section 10 states materials in Table 5 are acceptable, so L-80 (etc.) are acceptable as specified in 5CT. Table 5 should be referenced in Section 1(as it was formerly ); as now written it is unclear (I am no longer on T1-F1, or whatever the new committe name is.)
Some lack of clarity also comes from rewriting to humour the ISO people.

 

[eltooon]

In the 2009 edition, in Table A.3 it shows L80 type 1 is acceptable for all temperatures.
Does that imply that L80 type 1 is accepted though hardness requirement differs slightly?

 

[SJones]

No. It means that there are no exposure environment limitations in addition to the stipulated hardness restrictions.

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04

 

[blacksmith37]

Another way to say it is: Material in full compliance in every detail, to API 5CT Grade L80, is acceptable for all sour environments.

 

[SJones]

Isn't that the point of the original question? A supplementary hardness restriction has to be imposed upon ISO 11960.

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04

 

[salmon2]

Really? I thought those CTs are exempt from general CS hRdness limit, 22HRC. Such as t95 can be 26hrc.

 

[salmon2]

Of course each heat has to be tested per nace tm0177.

 

[SJones]

T95 is not L80

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04

 

[salmon2]

Shines, u r obviously an expert on this, while I am not. So I am trying to learn and ask questions.

I am not even certain about t95. But that is my understanding.

What I was asking is if t95 is up to 26hrc then L80 is possibly up to 23 as they are defined similarly in nace if I remember correct.

 

[eltooon]

Ya it's similar for T95. API 5CT require Max hardness 25.4 HRC.

Let's make it simpler:
Now I have a casing/tubing material that complies to API 5CT L80, and its hardness is 22.5 HRC. Is it acceptable for all service temperatures based on NACE?

 

[SJones]

From the point of view of sulphide stress cracking only, yes for L80 Type 1.

Salmon2

I'm certainly no expert, it's simply a case of taking the time to read all of the specifications and their intertwined requirements. The principal issue is what hardness value is allowed for L80 Type 1 without having to perform laboratory testing. For a generic carbon or low alloy steel, the line drawn by ISO 15156-2 is 22 HRC. However, ISO 11960 allows L80 Type 1 to have a maximum hardness of 23 HRC. For T95, you will note that ISO 11960 automatically requires a sulphide stress cracking test; therefore, ISO 15156 will simply defer to the 25.4 HRC requirement of ISO 11960. Bear in mind that even though ISO 15156-2 allows 26 HRC, the manufacture will not be able to certify the material as compliant with ISO 11960 at this hardness level.

All of the above is based on ISO 11960 2004 with corrigendum and not the current 2011 version because I don't have it.

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04